CA2405216C - Sandal strapping system - Google Patents
Sandal strapping system Download PDFInfo
- Publication number
- CA2405216C CA2405216C CA002405216A CA2405216A CA2405216C CA 2405216 C CA2405216 C CA 2405216C CA 002405216 A CA002405216 A CA 002405216A CA 2405216 A CA2405216 A CA 2405216A CA 2405216 C CA2405216 C CA 2405216C
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- CA
- Canada
- Prior art keywords
- strap
- ankle
- sole
- channels
- sandal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/12—Sandals; Strap guides thereon
- A43B3/126—Sandals; Strap guides thereon characterised by the shape or layout of the straps
Abstract
A sandal construction, including a sole and a strapping system for retaining the sole on a foot. The strapping system includes a front strap and a buckle strap that cooperatively adjust and retain the sandal on the foot of the wearer. The front strap extends from the ankle region to the forefoot region passing over and through the sole. The front strap crisscrosses to form an X-shaped crossover that is substantially centered in the forefoot region. The front strap extends through a buckle that is attached to an adjustable-length buckle strap. The wearer adjusts the strapping system through both the ankle and forefoot regions simply by adjusting the length of the buckle strap.
Description
SANDAL STRAPPING SYSTEM
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to footwear constructions, and mor-e particularly to a sandal construction.
I F Description of the Ai-t Sandals have typically functioned as casual footwear, pi-oviding only limited suppoi-t and stability. As a result, traditional sandals were not well suited for- use in athletic and spoi-ting applications More recently, however, sandals have evolved to provide increased suppoi-t and stability, making them more suitable for- a variety of athletic and spoi-ting applications These improvements have resulted primarily from advances in the sole and in the strapping system. Although there has been marked growth in the comfort and support pr-ovided by sandals, footwear manufacturers continue to search for- technologies capable of fur-ther enhancing the comfoi-t and support of sarrdals Conventional spoil sandals include a contoui-ed sole and a strapping system for retaining the sole against the bottom of a foot Typical sandals of this type include a front strap foi- retaining the foi-efoot, and ankle and heel straps for retainrng the reaa-portion of the foot. The front strap extends over the forefoot of the foot and includes opposite ends which are generally 2) 0 affixed to the sole. The fi-ont strap is typically length-adjustable to per-mi.t the sandal to be adjusted to snuggly fit different size feet. The ankle str-ap extends over the top surface of the foot just in fi=ont of the ankle and includes opposite ends aftixed to inner- and out ankle posts or directly to the sole. The heel strap wr-aps around the rear heel poi-tion of the foot and, like the ankle str-ap, is affixed to the ankle posts or dir-ectly to the sole. As with the front str-ap, at least one of the ankle or heel strap is typically adjustable in length to peimit the sandal to be adjusted to snuggly fit different size feet. These conventional two-strap systems require two separate adjustments to properly secure the sandal on the wearer's foot. As a result, the fi=ont strap is often adjusted to provide a loose fit so that the forefoot can be easily slipped into and out of the sandal--leaving only the ankle or heel st.rap to be adjusted each time the sandal is worn.
Although this makes it easier to put on the sandal, it can, unfortunately, reduce the foot support provided by the sandal and potentially lead to foot or ankle injury.
Some manufacturers have simplifiecl the strap system by using a single adjustable strap that extends fi-om the ankle region over the forefoot and then back to the ankle region. By adjusting this single strap, sandal is secui-ed on the foot arid the fit of the sandal in both the ankle and forefoot i-egions is controlled. A conventional sandal having a single adjustable strap is shown in Fig. 1. As illustrated. the sandal 150 includes a sole 152 and a strap 160. The strap 160 is attached to a medial post 170 at one end, is threaded thi-ough the sole 152 and over the foot, and is threaded thi ough a buckle 172 that is attached to a latei-al post 174. The strap 160 is positioned on the sole 152 to cross ovei- itself in the front portion of the sandal, with the two crossed strap poi-tions defining a forefoot strap_ The sti-ap 160 passes fi-eely through the sole 152 so that pulling one erid of the strap 160 results in tightening the entire sti-ap, including in both the forefoot and ankle i-egions.
Although this strapping system keeps the sandal 150 attached to the foot, the strap 160 is configur-ed to crosses over itself in the forefoot region near the lateral edge of the sandal.
The laterally disposed crossover 171 may perrnit the foot to rnove within the sandal, possibly reducing support over the forefoot as a whole and causing discomfort. In addition to cr-ossing ovei- itself in the forefoot region, the strap 160 also crosses over itself just in fi-ont of the ankle at crossover 173_ These two ci-ossovers 171 aiid 173 create pi-essure points that may cause chafing and discomfort both while the strap 160 is being adjusted and dln=ing walking_ This problem is only exacerbated as the strap is inci-easingly tightened. Further, because the sti-ap 160 moves with respect to the sole 152. there is a potential for the strap 160 to i-ub against and cause significant wear of the sole 152 To address this concei7i, the sole I 52 must rnanufactured fi=om harder, rnore wear-resistant materials, such as polyurethane_ Unfortunately, anti-bacterial components, such as Microban,R: available from Microban Products Company, cannot be added to polyurethane and other similar components. As a result, sandals manufactured fi=om this material are subject to odor control issues. This is a particulai-ly acute problem with sandals because they are often woni in wet and dirty environments, where bacteria can i-eadily contaminate the sole. To address this concern, manufacturers typically recommend periodic washing of the sandal. This is inconvenient and burdensome, so much so that it is often not done.
Additionally, conventional sandals of this type are difficult to adjust when undei-load. Although the sole 152 is manufactUu-ed fi-otn a relatively hard material, it is, by design, sufficiently soft to pi-ovide some level of cushioning (e.g. some level of compression when under load). As a result, the sole 152 will compress under load, pinching those portions of the strap that pass through the sole 152. Significant loads can make it difficult, if not impossible, for the wearer to manually adjust the strap.
SUMMARY OF THE ITfVENT1ON
The aforementioned pw-oblem are overcome by the present invention wherein a sandal constiuction is provided with an adjustable sti-ap that passes through the sole and over the foot forming a crossover at substantially tiie centei- of the forefoot.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to footwear constructions, and mor-e particularly to a sandal construction.
I F Description of the Ai-t Sandals have typically functioned as casual footwear, pi-oviding only limited suppoi-t and stability. As a result, traditional sandals were not well suited for- use in athletic and spoi-ting applications More recently, however, sandals have evolved to provide increased suppoi-t and stability, making them more suitable for- a variety of athletic and spoi-ting applications These improvements have resulted primarily from advances in the sole and in the strapping system. Although there has been marked growth in the comfort and support pr-ovided by sandals, footwear manufacturers continue to search for- technologies capable of fur-ther enhancing the comfoi-t and support of sarrdals Conventional spoil sandals include a contoui-ed sole and a strapping system for retaining the sole against the bottom of a foot Typical sandals of this type include a front strap foi- retaining the foi-efoot, and ankle and heel straps for retainrng the reaa-portion of the foot. The front strap extends over the forefoot of the foot and includes opposite ends which are generally 2) 0 affixed to the sole. The fi-ont strap is typically length-adjustable to per-mi.t the sandal to be adjusted to snuggly fit different size feet. The ankle str-ap extends over the top surface of the foot just in fi=ont of the ankle and includes opposite ends aftixed to inner- and out ankle posts or directly to the sole. The heel strap wr-aps around the rear heel poi-tion of the foot and, like the ankle str-ap, is affixed to the ankle posts or dir-ectly to the sole. As with the front str-ap, at least one of the ankle or heel strap is typically adjustable in length to peimit the sandal to be adjusted to snuggly fit different size feet. These conventional two-strap systems require two separate adjustments to properly secure the sandal on the wearer's foot. As a result, the fi=ont strap is often adjusted to provide a loose fit so that the forefoot can be easily slipped into and out of the sandal--leaving only the ankle or heel st.rap to be adjusted each time the sandal is worn.
Although this makes it easier to put on the sandal, it can, unfortunately, reduce the foot support provided by the sandal and potentially lead to foot or ankle injury.
Some manufacturers have simplifiecl the strap system by using a single adjustable strap that extends fi-om the ankle region over the forefoot and then back to the ankle region. By adjusting this single strap, sandal is secui-ed on the foot arid the fit of the sandal in both the ankle and forefoot i-egions is controlled. A conventional sandal having a single adjustable strap is shown in Fig. 1. As illustrated. the sandal 150 includes a sole 152 and a strap 160. The strap 160 is attached to a medial post 170 at one end, is threaded thi-ough the sole 152 and over the foot, and is threaded thi ough a buckle 172 that is attached to a latei-al post 174. The strap 160 is positioned on the sole 152 to cross ovei- itself in the front portion of the sandal, with the two crossed strap poi-tions defining a forefoot strap_ The sti-ap 160 passes fi-eely through the sole 152 so that pulling one erid of the strap 160 results in tightening the entire sti-ap, including in both the forefoot and ankle i-egions.
Although this strapping system keeps the sandal 150 attached to the foot, the strap 160 is configur-ed to crosses over itself in the forefoot region near the lateral edge of the sandal.
The laterally disposed crossover 171 may perrnit the foot to rnove within the sandal, possibly reducing support over the forefoot as a whole and causing discomfort. In addition to cr-ossing ovei- itself in the forefoot region, the strap 160 also crosses over itself just in fi-ont of the ankle at crossover 173_ These two ci-ossovers 171 aiid 173 create pi-essure points that may cause chafing and discomfort both while the strap 160 is being adjusted and dln=ing walking_ This problem is only exacerbated as the strap is inci-easingly tightened. Further, because the sti-ap 160 moves with respect to the sole 152. there is a potential for the strap 160 to i-ub against and cause significant wear of the sole 152 To address this concei7i, the sole I 52 must rnanufactured fi=om harder, rnore wear-resistant materials, such as polyurethane_ Unfortunately, anti-bacterial components, such as Microban,R: available from Microban Products Company, cannot be added to polyurethane and other similar components. As a result, sandals manufactured fi=om this material are subject to odor control issues. This is a particulai-ly acute problem with sandals because they are often woni in wet and dirty environments, where bacteria can i-eadily contaminate the sole. To address this concern, manufacturers typically recommend periodic washing of the sandal. This is inconvenient and burdensome, so much so that it is often not done.
Additionally, conventional sandals of this type are difficult to adjust when undei-load. Although the sole 152 is manufactUu-ed fi-otn a relatively hard material, it is, by design, sufficiently soft to pi-ovide some level of cushioning (e.g. some level of compression when under load). As a result, the sole 152 will compress under load, pinching those portions of the strap that pass through the sole 152. Significant loads can make it difficult, if not impossible, for the wearer to manually adjust the strap.
SUMMARY OF THE ITfVENT1ON
The aforementioned pw-oblem are overcome by the present invention wherein a sandal constiuction is provided with an adjustable sti-ap that passes through the sole and over the foot forming a crossover at substantially tiie centei- of the forefoot.
In a pi-efen-ed embodiment, the sandal includes a strapping system having medial and lateral posts positioned on opposite sides of the ankle. A heel strap extends between the posts a.round the heel. The strapping systeni also includes a fi-ont strap that extends between the ankle and forefoot i-egions of the sandal. The sti-ap includes a first end that is secured to the sole in the foi-efoot region. The strap crisscrosses over substantially the center of the foot in the forefoot i-egion and then extends rearwardly to an ankle post In a more prefen=ed embodiment, the sole defines a plurality of channels passing between the lateral and medial sides of the sandal to peimit passage of the fi=ont strap. The sole turther defines spaced apertures near each edge of the sole to allow the front strap to pass into the channels from the upper side of the sandal.
In an even more preferred embodinient, the sole includes a flexplate disposed between a midsole and an outsole_ "I'he flexplate is substantially rigid providing support and stability to the sandal. The tlexplate may also define the channels through which the fi-ont strap pa.sses. Covers may be placed over the channels to entrap the strap in rigid tunnels.
The present invention provides a sandal having a continuous front strap that pet7nits simultaneous adjustment in both the ankle and heel i-egions as the sandal is secured to the foot. The front strap is relat-ively easy io adjust and is positioned on the sole to provide improved comfort and support. The substantially centered crossover in the forefoot i-egion provides improved comfort and lateral stability. Fuilhei-, the flexplate reduces wear in the midsole by providing a hard surface for the sti-ap to move against. This permits the midsole to be manufactured fi-om softei- materials, includirlg vaiious materials that can be impregnated with an anti-bacterial component to reduce bacterial growth The flexplate also provides a low friction surface to ease movement of the strap dui-ing adjustment. Also, the flexplate channels facilitate manufacture by positively and easily locating the straps. The flexplate covers enclose the straps in rigid tunnels. This protects the straps froxn being pinched by the sole, and peimits easy adjustment even undet- when the sandal is undei- load.
T'hese and other objects, advantages, and featui-es of the invention will be more readily understood and appreciated by reference to the detailed description of the prefeii-ed embodiment and the di-awings BRIEF DESCRIPTION OF THE DRAWINGS
Fig. I is a perspective view of a sandal according to the prior art;
Fig. 2 is a pei-spective view of a sandal incorporating the present invention;
Fig. 3 is an exploded perspective view of the sandal;
Fig. 4 is a sectional vievNalong line 4-4 in Fig. 2 of a sandal incolporating the present invention without the optional covers, Fig. 5 is a perspective view of the sole of the sandal;
Fig. Fi is a sectional view along line 4-4 in Fig. 2 of a sandal incorporating the present invention with covers; and Fig 7 is an exploded perspective view of' the pi-esent invention with optional covers.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A sandal constructed in accordance with a prefen=ed embodiment of the pi-esent invention is shown in Figs. 2 and .3 and genei-ally designated 10. In general, the sandal 10 includes a sole 8 and a strapping systeni 50. The sole 8 includes an outsole 20, a flexplate 30 and a midsole 40. The strapping system 50 includes a continuous fi=ont strap 82 that runs fi-om the ankle post through the sole 8 and crisscrosses in the forefoot region to retains a wearer's foot.
In an even more preferred embodinient, the sole includes a flexplate disposed between a midsole and an outsole_ "I'he flexplate is substantially rigid providing support and stability to the sandal. The tlexplate may also define the channels through which the fi-ont strap pa.sses. Covers may be placed over the channels to entrap the strap in rigid tunnels.
The present invention provides a sandal having a continuous front strap that pet7nits simultaneous adjustment in both the ankle and heel i-egions as the sandal is secured to the foot. The front strap is relat-ively easy io adjust and is positioned on the sole to provide improved comfort and support. The substantially centered crossover in the forefoot i-egion provides improved comfort and lateral stability. Fuilhei-, the flexplate reduces wear in the midsole by providing a hard surface for the sti-ap to move against. This permits the midsole to be manufactured fi-om softei- materials, includirlg vaiious materials that can be impregnated with an anti-bacterial component to reduce bacterial growth The flexplate also provides a low friction surface to ease movement of the strap dui-ing adjustment. Also, the flexplate channels facilitate manufacture by positively and easily locating the straps. The flexplate covers enclose the straps in rigid tunnels. This protects the straps froxn being pinched by the sole, and peimits easy adjustment even undet- when the sandal is undei- load.
T'hese and other objects, advantages, and featui-es of the invention will be more readily understood and appreciated by reference to the detailed description of the prefeii-ed embodiment and the di-awings BRIEF DESCRIPTION OF THE DRAWINGS
Fig. I is a perspective view of a sandal according to the prior art;
Fig. 2 is a pei-spective view of a sandal incorporating the present invention;
Fig. 3 is an exploded perspective view of the sandal;
Fig. 4 is a sectional vievNalong line 4-4 in Fig. 2 of a sandal incolporating the present invention without the optional covers, Fig. 5 is a perspective view of the sole of the sandal;
Fig. Fi is a sectional view along line 4-4 in Fig. 2 of a sandal incorporating the present invention with covers; and Fig 7 is an exploded perspective view of' the pi-esent invention with optional covers.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A sandal constructed in accordance with a prefen=ed embodiment of the pi-esent invention is shown in Figs. 2 and .3 and genei-ally designated 10. In general, the sandal 10 includes a sole 8 and a strapping systeni 50. The sole 8 includes an outsole 20, a flexplate 30 and a midsole 40. The strapping system 50 includes a continuous fi=ont strap 82 that runs fi-om the ankle post through the sole 8 and crisscrosses in the forefoot region to retains a wearer's foot.
The illustrated sandal 10 is intended to be worn on the right foot and will be described in detail.
Of course, a sandal intended to be woi-n on the left foot may be a miiror image of t.he illustrated sandal 10 The sandal 10 includes front and rear portions 12 and 14, and opposing edges and 18. The opposing edges 16 and 18 are te--rned the inner cn- medial edge 16 and the outer or lateral edge 18. By way of fui-ther clarification, when worn, the medial edge 16 of the illustrated sandal 10 for the right foot will face the medial edge of the sandal for the left foot (not shown).
1 Construction As noted above, the sandal 10 includes a sole 8 and a sti-apping system 50.
The sole 8 generally includes an outsole 20, a f7explate 30 and a midsole 40. The outsole 20 engages the ground and foims the wear surface of'the sandal 10. The outsole 20 is generally conventional and is made of conventional outsole materials that are selected to provide the desired balance between comfort. wear and traction. Although the outsole is preferably a conventional rubber compound. a variety of other materials rnay be used to provide the desired comfort, wear and traction. The outsole 20 may include ti-ead 24, lugs (not shown) or otherwise be configured to enhance traction. The design and configuration of the outsole 20 will vaiy fi-om application to application as desired.
'The flexplate 30 is a substantially rigid plate that extends along a majority of the sole 8 providing enhanced stability and support. In the preferred embodiment, the flexplate 30 is partially entrapped by the nlidsole 40 Alternatively, the tlexplate 30 can be completely encased within the midsole 40 so that tlle outsole 20 engages only the midsole 40. The flexplate 30 is prefei-ably contoured to follow the shape of the sole 8 and the shape of the wearet-'s foot. The flexplate 30 defines a plurality of channels 36 that, as described in more detail below, provide passages and locating means for portions of the strapping system 50. Portions of the strapping system 50 may slide through some of the channels 30 or may be stationaiy in other channels 36.
The channels 36 are pi-eferably defined by x ariations in the shape of the plate. As shown in Figs.
6 and 7, covet-s 34 are preferably placed over the channels 30 to define tunnels that entrap the corresponding sti-ap portions and prevent ciifficulty in adjusting the sandal 10 under load. In the prefen=ed embodiment, the flexplate 30 detines a front channel 70 and a middle channel 72. The flexplate 30 also defines a pair of shoulde+s 35 extending along each side of the channels 70 and 72. The shoulders 35 are configured to receive the covers 34. The flexplate 30 also includes medial and lateral edges 37 and 39 that may be rounded or defiine indentations (not shown) to allow the strapping system 50. discusseci below, to pass in and out of the channels 36 without binding oi- weaTing against the edges 37 and 39 of the flexplate 30. As can be seen in Figs. 6 and 7, the covers 34 woi-k in conjunction with the tlexplate 30 to lorm a continuous sui-face along the length of the flexplate 30 so that the outsole 20 may be fii-rnly and securely attached. In the pi-efeired embodiment. the fi-ont channel 70 is approximately peipendiculai-to the medial and lateral edges 37 and 39 of the flexplate 30. The middle channel 72 is angled somewhat fi=om the peipendiculat- axis of the medial and lateral edges 37 and 39 Of course other angles may readily be used as desired while providing the strapping system 50 The flexplate 30 also defines a channel segment 74 in which one end of the front strap 82 is attached as discussed below. In the preferred enibodiment, the channel segment 74 is located near the middle chatinel 72 and connected to the medial edge 37 of the flexplate 30.
Further, the flexplate 30 defines a rear channel 70 disposed at the rear of the sandal 10 The rear channel 76 receives the ankle post strap 56 as described below Because the straps are fixed within channel segment 74 and rear channel 76 (e.g. they are not intended to move during adjustment of the straps), covers are not disposed ovet- the i-ear channel 74.
Accordingly, the channel segment 74 and the rear channel 76 are preferably not as deep as the front and middle channels 70 and 72 and do not iticlude shoulders.
The flexplate 30 further ittcludes a heel portion 32 that is shaped to accommodate an air-cushioning device 42. The flexplate 30 is manufactured from a t-igid material selected to provide the sandal 10 witlt the desired rigidity. 'I'he air-cushioning device provides increased compression in the heel region Air-cushioning devices 42 are well known in the art. As shown in Fig. 3, one such air-cushioning device 42 rits within the heel portion 32 of the flexplate 30. Of cout-se, it should be readily apparent that the air-cushioning device 42 and the heel portion 32 may be of any shape ot- size. In the prefefTed embodiment. the air-cushioning device 42 is generally placed under the heel of the wea.rer and within the midsole 40 to provide extra cushioning while wearing the sandal 10. f3y foiming the flexplate 30 somewhat around the air-cushioning device 42 in the area where the heel contacts the niidsole, more cushioning may be provided fot- the wearer. In the pret'etred embodiment, the air-cushioning device 42 does not interfet-e with the stability and rigidity provided by the flexplate 30. ln some cases where more stability and rigidity is desii-ed, the flexplate 30 may run the entii-e length of the midsole 40 with the air- cushioning device 42 being eliminated or placed on top of'the flexplate.30.
A suitable matetial for manufacturing the flexplate 30 is a polymeric amide such as nylon. The nylon may be reinforced with tiberglass or other materials. A
conventional bonding material may also be applied to the flexplate 30 to improve the bond between the diffei-ing materials of the flexplate 30 and the midsole 40 or the outsole 20.
The midsole 40 is manufactured fi=om relatively resilient material, selected to provide the sole 8 with the desired level of cushioni.ng T'he midsole overlays the outsole 20 and preferably entraps the flexplate 30. In the preferred embodiment, the midsole 40 is formed out of ethyl vinyl acetate (EVA). Using EVA to form the midsole 40, instead of polyurethane, allows the midsole 40 to include an anti-bacterial agent such as MicroBan . Further, the midsole 40 is contoured for comfort as shown in Fig. 5, although it should be readily apparent that other contours and configurations may be used. Three-dimensional contouring provides more comfort for the wearer. The top surface 48 of the midsole 40 may also include texturing to improve comfort and helps locate the foot of the wearer on the sole 8. The midsole 40 defines apertures 46 through which the strapping system 50 passes. The apertures 46 allow the strapping system 50 to pass from the top side 48 into the channels 36. More specifically, apertures 100 and 102 are aligned with opposite ends of the front channel 70, apertures 106 and 108 are aligned with opposite ends of the middle channel 72, and apertures 110 and 112 are aligned with opposite ends of the rear channel 76. Further, aperture 100 is aligned with the open end of channel segment 74. The apertures 46 and the channels 36 generally work in conjunction to allow the strapping system 50 to pass under the midsole 40 and the flexplate 30 and exit the apertures 46 on the opposing side.
As noted above, the strapping system 50 functions to secure the wearer's foot to the sole 8. The strapping system 50 an ankle portion 60 and a forefoot portion 80, both of which are adjustable to match the fit of the sandal 10 to the wearer's foot.
The ankle portion 60 includes lateral and medial ankle posts 52 and 54 that extend upwardly from the lateral and medial sides 18 and 16, respectively, of the rear portion 14 of the sole 8. The ankle posts 52 and 54 are preferably defmed by opposite ends of a single ankle strap 56. The ankle strap 56 extends through the rear channe176 and protrudes from apertures 110 and 112. The ankle strap 56 may be secured in the rear channel 76 by adhesive. In the preferred embodiment, the ankle sti-ap 56, and hence the ankle posts 52 and 54, is foimed out of a nylon strap that is doubled over to provide a celtain degree of rigidity, allowing the ankle pots 52 and 54 to maintain a somewhat upright position from the sole 8 as showti in Fig.
3. The ankle posts 52 and 54 may also be foi-med by passing a single nylon strap through the rear channel 76 and doubling over just the upper portion 64 as shown in Fig. 7. The ankle posts 52 and 54 could be made of leathei-, canvas or a variety of other materials or combinations of materials. A variety of other configurations may also be used to t'orm the ankle posts 52 and 54.
The ankle portion 60 also includes a first strap 90, a second sti-ap 92, an elliptical ring 94 and a cushioning layer 96. In the prefen-ed embodiment, the first strap 90 is attached to the lateral ankle post 52 and the second strap 92 is attached to the medial ankle post 54. The second strap 921. as shown in Fig 3 and 4, forms a loop around the elliptical ring 94. The first stt-ap 90 passes aci-oss the sandal 10 to the medial side 16, through the elliptical ring 94, and back across to the lateral side 18 The tirst strap 90 may include hook and loop fasteners, such as VelcroK, to adjustably secure the fu=st strap 90 back onto itself. Other methods of closure may be used such as snaps, buckles, or a fixed non-adjustahle strap The first and second straps 90 and 9-2 are preferably attached to the ankle posts 52 and 54 by stitching.
However, othei- various conventional methods such ~Ls riveting or stapling may be used.
The cushioning layer 96 is attached to the inner side of the fii-st strap 90 to contact the wearer's foot. providing cushioning and comfort. 'The cushioning layer 96 is prefei-ably stitched to the first strap 90, but may be attached by other suitable methods such as passing the strap thi-ough a sleeve on the cushion layer, snaps oi- a hook and loop closure such as Velcro'K'ln the preferred embodiment, the first and second straps 90 and 92 are formed fi=om nylon and the cushioning layer 96 is formed from ncopi-ene. Other suitable materials may be used, such as leather or canvas for the str-aps and padded cotton, rubber- or- chambrelle for the cushioning layer The front por-tion 80 of the str-apping system 50 extends from the ankle region to rhe forefoot region of the sandal 10. The ti-ont por-tion 80 includes a front strap 82, a buckle sti-ap 84 and a buckle 86. The fr-ont strap 82 and the buckle strap 84 are made out of nylon although othei- suitable durable materials such as leather and canvas rnay be used. The buckle 86 is a conventional buckle fornied fi-om conventional materials and is well known in the art.
The front strap 82 includes a first end 81 and a second end 83. The front strap 82 is attached at a first end 81 to the medial ankle post 54. preferably by stitching. Other conventional attachment methods. such as riveting or stapling, may be used to secure the fi-ont strap 82 to the medial ankle post 54. The second end 83 is attached to the flexplate 30 near the medial edge 37 The fi=ont strap 82 threads ove.r the foot, thr-ough the apertures 46 and the channels 36 to form a crossover centered over the sole 8, as shown in Fig. 2.
The buckle 86 is attached to the front strap 82, somewhat near the first end 8 1 The fr=ont sti-ap 82 is descr-ibed in greater detail below in retation to the wearer's foot.
The buckle sti-ap 84 is the adjustment strap for the front strap system 80.
The buckle strap 84 is attached to the lateral ankle post 52 at a first end 58 and thr-eads through the buckle 86. The second end 87 is left ii-ee for the user to pull on, thereby moving the buckle toward 86 the later-al ankle post 52 and adjusting the fi-ont sti-ap 82 as desired. The buckle strap 84 is for-med of nylon, although leather and other- suitably durable materials may be used. It should be readily apparent that the front sti-ap system 80 may be formed in almost a near min=or image where the buckle strap 84 is attached to the medial ankle post 54 and the frrst end 81 of the front strap 82 is attached to the later-al ankle post 52. Fur-ther, the second end 83 of the fr-ont sti-ap 82 would be attached nea.r the lateral edge 39 of the flexplate 30, while keeping the X-shape of the fi-ont strap 82 centered over the weai-ei-'s forefoot.
As noted above, the secor-d end 83 of the front sti-ap 82 is attached to the flexplate 30 near the medial edge 37. More specifically, the second end 83 is mounted in the channel segment 74, preferably by an adhesive or two-sided tape. Othet= means of attachments such as stitching, iiveting or pins may be used to secure the fi-ont strap 82 in the channel segment 74.
The front strap 82 then passes ti=om the channel segment 74 through the aperture 100. In relation to the wear-ei-'s foot. (not shown), the front strap 8-2 emei-ges from aperture 100 approximately centered along the length of the fii-st body metatai-sus (not shown). As shown in Fig. 2, the front strap 82 foi-rns a first poi-tion 1 10 by passing from aperture 100 near the medial side 16 across the foot to aperture 102, near the lateral side 18_ In relation to the weai-er's foot (not shown), the fi-ont sti-ap 82 entei-s apei-tui-e 102 near the fifth body of the second i-ow of phalanges (not shown).
Apei-tui-e 102 is connected to the fi=ont channel 70, allowing the fi-ont strap 82 to pass through the midsole 40 and into the fi-ont channel 70 defined by the flexplate 30. The fi-ont strap 82 then passes from the latei-al side 18 to the medial side 16 through the fi-ont channel 72 to emerge from apertui-e 104, near the fiist body of the first row of phalanges (not shown).
Fi-om aperture 104, the front strap 82 passes ovei- the forefoot to aperture 106, defining a second portion 122. The first portion 110 and the second portion 122 form an X-shape crossovei-located substantially at the center of the wearer's foot. The second portion 122 preferaUly passes undei- the first portion 1 l 0 so as the fi-ont strap 82 is being adjusted, it does not become pinched against the foot until all adjustment is done. In relation to the wearer's foot (not shown), the fi-ont sti-ap 82 enters aperture 106 near the fifth body metatarsus (not shown) The front sti-ap 82 passes through aperture 106 through the middle channel 72 and out aper-tui-e 108. Aperture 108 is near the first cuneifoim (not. shown) and the navicular (not shown) in relation to the wearer-'s foot. From apertui-e 108 the fi-ont sti-ap 82 passes over the instep of the foot and through the buckle 86.
From the buckle 86, the front strap 82 passes back aci-oss the instep of the wearer's foot to the medial ankle post 54. It should be understood that the above description of the front strap 82 is the preferred embodiment and that variations are possible without departing from the spirit of the invention.
The sandal 10 is worn by a weal-er by tirst i-eleasing tension on the strap system 50 with the buckle 86. The wearei- pivots the buckle 86 to i-elease the buckle strap 84 which reieases tension on the front sti-ap 82. l'he wearer may also loosen or unstrap the ankle strap system 60 by loosening the fii-st sti-ap 90. The weai-er then slips his or her foot (not shown) between the ankle posts 52 and 54 and foitivard under the fi-ont strapping system 80. The wearer may then tighten the ankle portion 60 oi'the strapping system 50 and the fi=ont poi-tion 80 of the strapping system 50 to secure the foot against the sandal sole 8. When the fi-ont strap system 80 is tightened, the fi-ont strap 8-2 slides thi-ough the apertures 46 and the channels 36 pulling snuggly against the wearer's foot along its entire 1ength from ankle region to forefoot region.
Of course, a sandal intended to be woi-n on the left foot may be a miiror image of t.he illustrated sandal 10 The sandal 10 includes front and rear portions 12 and 14, and opposing edges and 18. The opposing edges 16 and 18 are te--rned the inner cn- medial edge 16 and the outer or lateral edge 18. By way of fui-ther clarification, when worn, the medial edge 16 of the illustrated sandal 10 for the right foot will face the medial edge of the sandal for the left foot (not shown).
1 Construction As noted above, the sandal 10 includes a sole 8 and a sti-apping system 50.
The sole 8 generally includes an outsole 20, a f7explate 30 and a midsole 40. The outsole 20 engages the ground and foims the wear surface of'the sandal 10. The outsole 20 is generally conventional and is made of conventional outsole materials that are selected to provide the desired balance between comfort. wear and traction. Although the outsole is preferably a conventional rubber compound. a variety of other materials rnay be used to provide the desired comfort, wear and traction. The outsole 20 may include ti-ead 24, lugs (not shown) or otherwise be configured to enhance traction. The design and configuration of the outsole 20 will vaiy fi-om application to application as desired.
'The flexplate 30 is a substantially rigid plate that extends along a majority of the sole 8 providing enhanced stability and support. In the preferred embodiment, the flexplate 30 is partially entrapped by the nlidsole 40 Alternatively, the tlexplate 30 can be completely encased within the midsole 40 so that tlle outsole 20 engages only the midsole 40. The flexplate 30 is prefei-ably contoured to follow the shape of the sole 8 and the shape of the wearet-'s foot. The flexplate 30 defines a plurality of channels 36 that, as described in more detail below, provide passages and locating means for portions of the strapping system 50. Portions of the strapping system 50 may slide through some of the channels 30 or may be stationaiy in other channels 36.
The channels 36 are pi-eferably defined by x ariations in the shape of the plate. As shown in Figs.
6 and 7, covet-s 34 are preferably placed over the channels 30 to define tunnels that entrap the corresponding sti-ap portions and prevent ciifficulty in adjusting the sandal 10 under load. In the prefen=ed embodiment, the flexplate 30 detines a front channel 70 and a middle channel 72. The flexplate 30 also defines a pair of shoulde+s 35 extending along each side of the channels 70 and 72. The shoulders 35 are configured to receive the covers 34. The flexplate 30 also includes medial and lateral edges 37 and 39 that may be rounded or defiine indentations (not shown) to allow the strapping system 50. discusseci below, to pass in and out of the channels 36 without binding oi- weaTing against the edges 37 and 39 of the flexplate 30. As can be seen in Figs. 6 and 7, the covers 34 woi-k in conjunction with the tlexplate 30 to lorm a continuous sui-face along the length of the flexplate 30 so that the outsole 20 may be fii-rnly and securely attached. In the pi-efeired embodiment. the fi-ont channel 70 is approximately peipendiculai-to the medial and lateral edges 37 and 39 of the flexplate 30. The middle channel 72 is angled somewhat fi=om the peipendiculat- axis of the medial and lateral edges 37 and 39 Of course other angles may readily be used as desired while providing the strapping system 50 The flexplate 30 also defines a channel segment 74 in which one end of the front strap 82 is attached as discussed below. In the preferred enibodiment, the channel segment 74 is located near the middle chatinel 72 and connected to the medial edge 37 of the flexplate 30.
Further, the flexplate 30 defines a rear channel 70 disposed at the rear of the sandal 10 The rear channel 76 receives the ankle post strap 56 as described below Because the straps are fixed within channel segment 74 and rear channel 76 (e.g. they are not intended to move during adjustment of the straps), covers are not disposed ovet- the i-ear channel 74.
Accordingly, the channel segment 74 and the rear channel 76 are preferably not as deep as the front and middle channels 70 and 72 and do not iticlude shoulders.
The flexplate 30 further ittcludes a heel portion 32 that is shaped to accommodate an air-cushioning device 42. The flexplate 30 is manufactured from a t-igid material selected to provide the sandal 10 witlt the desired rigidity. 'I'he air-cushioning device provides increased compression in the heel region Air-cushioning devices 42 are well known in the art. As shown in Fig. 3, one such air-cushioning device 42 rits within the heel portion 32 of the flexplate 30. Of cout-se, it should be readily apparent that the air-cushioning device 42 and the heel portion 32 may be of any shape ot- size. In the prefefTed embodiment. the air-cushioning device 42 is generally placed under the heel of the wea.rer and within the midsole 40 to provide extra cushioning while wearing the sandal 10. f3y foiming the flexplate 30 somewhat around the air-cushioning device 42 in the area where the heel contacts the niidsole, more cushioning may be provided fot- the wearer. In the pret'etred embodiment, the air-cushioning device 42 does not interfet-e with the stability and rigidity provided by the flexplate 30. ln some cases where more stability and rigidity is desii-ed, the flexplate 30 may run the entii-e length of the midsole 40 with the air- cushioning device 42 being eliminated or placed on top of'the flexplate.30.
A suitable matetial for manufacturing the flexplate 30 is a polymeric amide such as nylon. The nylon may be reinforced with tiberglass or other materials. A
conventional bonding material may also be applied to the flexplate 30 to improve the bond between the diffei-ing materials of the flexplate 30 and the midsole 40 or the outsole 20.
The midsole 40 is manufactured fi=om relatively resilient material, selected to provide the sole 8 with the desired level of cushioni.ng T'he midsole overlays the outsole 20 and preferably entraps the flexplate 30. In the preferred embodiment, the midsole 40 is formed out of ethyl vinyl acetate (EVA). Using EVA to form the midsole 40, instead of polyurethane, allows the midsole 40 to include an anti-bacterial agent such as MicroBan . Further, the midsole 40 is contoured for comfort as shown in Fig. 5, although it should be readily apparent that other contours and configurations may be used. Three-dimensional contouring provides more comfort for the wearer. The top surface 48 of the midsole 40 may also include texturing to improve comfort and helps locate the foot of the wearer on the sole 8. The midsole 40 defines apertures 46 through which the strapping system 50 passes. The apertures 46 allow the strapping system 50 to pass from the top side 48 into the channels 36. More specifically, apertures 100 and 102 are aligned with opposite ends of the front channel 70, apertures 106 and 108 are aligned with opposite ends of the middle channel 72, and apertures 110 and 112 are aligned with opposite ends of the rear channel 76. Further, aperture 100 is aligned with the open end of channel segment 74. The apertures 46 and the channels 36 generally work in conjunction to allow the strapping system 50 to pass under the midsole 40 and the flexplate 30 and exit the apertures 46 on the opposing side.
As noted above, the strapping system 50 functions to secure the wearer's foot to the sole 8. The strapping system 50 an ankle portion 60 and a forefoot portion 80, both of which are adjustable to match the fit of the sandal 10 to the wearer's foot.
The ankle portion 60 includes lateral and medial ankle posts 52 and 54 that extend upwardly from the lateral and medial sides 18 and 16, respectively, of the rear portion 14 of the sole 8. The ankle posts 52 and 54 are preferably defmed by opposite ends of a single ankle strap 56. The ankle strap 56 extends through the rear channe176 and protrudes from apertures 110 and 112. The ankle strap 56 may be secured in the rear channel 76 by adhesive. In the preferred embodiment, the ankle sti-ap 56, and hence the ankle posts 52 and 54, is foimed out of a nylon strap that is doubled over to provide a celtain degree of rigidity, allowing the ankle pots 52 and 54 to maintain a somewhat upright position from the sole 8 as showti in Fig.
3. The ankle posts 52 and 54 may also be foi-med by passing a single nylon strap through the rear channel 76 and doubling over just the upper portion 64 as shown in Fig. 7. The ankle posts 52 and 54 could be made of leathei-, canvas or a variety of other materials or combinations of materials. A variety of other configurations may also be used to t'orm the ankle posts 52 and 54.
The ankle portion 60 also includes a first strap 90, a second sti-ap 92, an elliptical ring 94 and a cushioning layer 96. In the prefen-ed embodiment, the first strap 90 is attached to the lateral ankle post 52 and the second strap 92 is attached to the medial ankle post 54. The second strap 921. as shown in Fig 3 and 4, forms a loop around the elliptical ring 94. The first stt-ap 90 passes aci-oss the sandal 10 to the medial side 16, through the elliptical ring 94, and back across to the lateral side 18 The tirst strap 90 may include hook and loop fasteners, such as VelcroK, to adjustably secure the fu=st strap 90 back onto itself. Other methods of closure may be used such as snaps, buckles, or a fixed non-adjustahle strap The first and second straps 90 and 9-2 are preferably attached to the ankle posts 52 and 54 by stitching.
However, othei- various conventional methods such ~Ls riveting or stapling may be used.
The cushioning layer 96 is attached to the inner side of the fii-st strap 90 to contact the wearer's foot. providing cushioning and comfort. 'The cushioning layer 96 is prefei-ably stitched to the first strap 90, but may be attached by other suitable methods such as passing the strap thi-ough a sleeve on the cushion layer, snaps oi- a hook and loop closure such as Velcro'K'ln the preferred embodiment, the first and second straps 90 and 92 are formed fi=om nylon and the cushioning layer 96 is formed from ncopi-ene. Other suitable materials may be used, such as leather or canvas for the str-aps and padded cotton, rubber- or- chambrelle for the cushioning layer The front por-tion 80 of the str-apping system 50 extends from the ankle region to rhe forefoot region of the sandal 10. The ti-ont por-tion 80 includes a front strap 82, a buckle sti-ap 84 and a buckle 86. The fr-ont strap 82 and the buckle strap 84 are made out of nylon although othei- suitable durable materials such as leather and canvas rnay be used. The buckle 86 is a conventional buckle fornied fi-om conventional materials and is well known in the art.
The front strap 82 includes a first end 81 and a second end 83. The front strap 82 is attached at a first end 81 to the medial ankle post 54. preferably by stitching. Other conventional attachment methods. such as riveting or stapling, may be used to secure the fi-ont strap 82 to the medial ankle post 54. The second end 83 is attached to the flexplate 30 near the medial edge 37 The fi=ont strap 82 threads ove.r the foot, thr-ough the apertures 46 and the channels 36 to form a crossover centered over the sole 8, as shown in Fig. 2.
The buckle 86 is attached to the front strap 82, somewhat near the first end 8 1 The fr=ont sti-ap 82 is descr-ibed in greater detail below in retation to the wearer's foot.
The buckle sti-ap 84 is the adjustment strap for the front strap system 80.
The buckle strap 84 is attached to the lateral ankle post 52 at a first end 58 and thr-eads through the buckle 86. The second end 87 is left ii-ee for the user to pull on, thereby moving the buckle toward 86 the later-al ankle post 52 and adjusting the fi-ont sti-ap 82 as desired. The buckle strap 84 is for-med of nylon, although leather and other- suitably durable materials may be used. It should be readily apparent that the front sti-ap system 80 may be formed in almost a near min=or image where the buckle strap 84 is attached to the medial ankle post 54 and the frrst end 81 of the front strap 82 is attached to the later-al ankle post 52. Fur-ther, the second end 83 of the fr-ont sti-ap 82 would be attached nea.r the lateral edge 39 of the flexplate 30, while keeping the X-shape of the fi-ont strap 82 centered over the weai-ei-'s forefoot.
As noted above, the secor-d end 83 of the front sti-ap 82 is attached to the flexplate 30 near the medial edge 37. More specifically, the second end 83 is mounted in the channel segment 74, preferably by an adhesive or two-sided tape. Othet= means of attachments such as stitching, iiveting or pins may be used to secure the fi-ont strap 82 in the channel segment 74.
The front strap 82 then passes ti=om the channel segment 74 through the aperture 100. In relation to the wear-ei-'s foot. (not shown), the front strap 8-2 emei-ges from aperture 100 approximately centered along the length of the fii-st body metatai-sus (not shown). As shown in Fig. 2, the front strap 82 foi-rns a first poi-tion 1 10 by passing from aperture 100 near the medial side 16 across the foot to aperture 102, near the lateral side 18_ In relation to the weai-er's foot (not shown), the fi-ont sti-ap 82 entei-s apei-tui-e 102 near the fifth body of the second i-ow of phalanges (not shown).
Apei-tui-e 102 is connected to the fi=ont channel 70, allowing the fi-ont strap 82 to pass through the midsole 40 and into the fi-ont channel 70 defined by the flexplate 30. The fi-ont strap 82 then passes from the latei-al side 18 to the medial side 16 through the fi-ont channel 72 to emerge from apertui-e 104, near the fiist body of the first row of phalanges (not shown).
Fi-om aperture 104, the front strap 82 passes ovei- the forefoot to aperture 106, defining a second portion 122. The first portion 110 and the second portion 122 form an X-shape crossovei-located substantially at the center of the wearer's foot. The second portion 122 preferaUly passes undei- the first portion 1 l 0 so as the fi-ont strap 82 is being adjusted, it does not become pinched against the foot until all adjustment is done. In relation to the wearer's foot (not shown), the fi-ont sti-ap 82 enters aperture 106 near the fifth body metatarsus (not shown) The front sti-ap 82 passes through aperture 106 through the middle channel 72 and out aper-tui-e 108. Aperture 108 is near the first cuneifoim (not. shown) and the navicular (not shown) in relation to the wearer-'s foot. From apertui-e 108 the fi-ont sti-ap 82 passes over the instep of the foot and through the buckle 86.
From the buckle 86, the front strap 82 passes back aci-oss the instep of the wearer's foot to the medial ankle post 54. It should be understood that the above description of the front strap 82 is the preferred embodiment and that variations are possible without departing from the spirit of the invention.
The sandal 10 is worn by a weal-er by tirst i-eleasing tension on the strap system 50 with the buckle 86. The wearei- pivots the buckle 86 to i-elease the buckle strap 84 which reieases tension on the front sti-ap 82. l'he wearer may also loosen or unstrap the ankle strap system 60 by loosening the fii-st sti-ap 90. The weai-er then slips his or her foot (not shown) between the ankle posts 52 and 54 and foitivard under the fi-ont strapping system 80. The wearer may then tighten the ankle portion 60 oi'the strapping system 50 and the fi=ont poi-tion 80 of the strapping system 50 to secure the foot against the sandal sole 8. When the fi-ont strap system 80 is tightened, the fi-ont strap 8-2 slides thi-ough the apertures 46 and the channels 36 pulling snuggly against the wearer's foot along its entire 1ength from ankle region to forefoot region.
11 Manufacture and.Assembly The sandal 10 is manufactured using generally conventional machinery. The outsole 20 is manufactured by using conventional techniques and apparatuses.
The outsole 20 is preferably injection or pour molded from a hard durable i-ubbei- using conventional molding ?0 apparatuses. The outsole 20 cail be manufactured fi-om other dui-able outsole materials. The thread pattern 24 is formed during the molding operation as an integi-al part of the outsole 20.
The flexplate 30 is generally rnolded fi-om nylon that may be reinforced by other materials, such as fibet=glass. The flexplate 30 is molded to the desii-ed shape and upon curing is removed ti-om the flexplate mold (not shown). The midsole 40 is then manufactured by placing the flexplate 30 in a base mold (not shown), If the flexplate 30 is desii-ed to be bonded to the outsole 20, it is placed in the bottom of the base mold (not shown). The mold (not shown) may also incotpot-ate locating pins (not shown). These locating pins may raise the flexplate 30 so that the midsole 40 is molded around and completely encases the flexplate 30.
Alterrtatively, the midsole 40 may be molded without inaotpoi-ating the flexplate 30, which is later cemented or othel-wise bonded to the midsole 40. The mold (not shown) may include a textured surface to give the midsole 40 texture to increase friction between the toot and the midsole 40. After the midsole 40 has cured, the apertures 46 are cut using a die 'The apet-tures 46 allow the strapping system 50 to pass through the midsole 40. If desired, the apertui-es 46 can be formed as an integral part of the midsole 40 molding process using appropriately located pins (not shown).
The air-cushioning device 42 is prefei-ably manufactured using conventional techniques and apparatuses and therefore, will riot be described in detail.
The air-cushioning device 42 may be made out of a variety of conventional materials, selected to provide the proper amount of cushioning undei- load. The air-cushioning device 42 may be cemented, fiictionally fitted, held in place by the strapping system 50, or otherwise secured as desired.
The strapping systetn 50 is preferably made using conventional nylon webbing straps that ai-e well known in the art. The individual pieces ofi'the strapping system 50 are cut to length and stitched together. The uppei- portion 64 of the medial ankle post 54 is stitched to the front strap 80 and the second stt-ap 92. The lateral ankle post 52 is stitched to the buckle strap 84 and the first sti-ap 90 The lateral and medial ankle posts 52 and 54 are also doubled over and stitched togethei- to provide sufficient stiffness so that the ankle posts 52 and 54 can stand somewhat upright to allomf the wearer tc.) inset-t their foot without having to always adjust or hold the ankle posts 52 and 54. 'The ankle posts 52 and 54 are then inserted through aper-tures 110 and 1 12 and stitched together to fornl a single ankle sti-a.p 56. The ankle posts 52 and 54 may be stitched together, doubled over as shown in Fig. 3 or singly as shown in Fig.
7. The first end 81 ol'the front strap 82 is stitched to the medial ankle post 54. The second end 83 is then inserted and weaved thr-ough apertures 108, 106, 104 and 100 as described above and shown in Fig. 2.
After being inserted through aperture 100, the second end 8.3 of the front strap 82 is attached by adhesive or double-sided tape to the flexplate 30 iri the channel segment 74.
The optional cllannel covers 34 may then be inserted over the front and middle channels 70 and 72 to prevent the fi=ont strap system 80 from bindin, wltile the sole 8 is under load. Next, the outsole 20 is attached by cement or othei-xise bonded to the midsole 40 and flexplate 30.
The above desci-iption is that of a pi-efei-red embodiment of the invention.
Various alterations and changes can be made without departing from the spirit and broader aspects of the invention as defined in the appended claims, which are to be intet-preted in accordance with the pi-inciples of patent law including the doctrine of equivalents.
The outsole 20 is preferably injection or pour molded from a hard durable i-ubbei- using conventional molding ?0 apparatuses. The outsole 20 cail be manufactured fi-om other dui-able outsole materials. The thread pattern 24 is formed during the molding operation as an integi-al part of the outsole 20.
The flexplate 30 is generally rnolded fi-om nylon that may be reinforced by other materials, such as fibet=glass. The flexplate 30 is molded to the desii-ed shape and upon curing is removed ti-om the flexplate mold (not shown). The midsole 40 is then manufactured by placing the flexplate 30 in a base mold (not shown), If the flexplate 30 is desii-ed to be bonded to the outsole 20, it is placed in the bottom of the base mold (not shown). The mold (not shown) may also incotpot-ate locating pins (not shown). These locating pins may raise the flexplate 30 so that the midsole 40 is molded around and completely encases the flexplate 30.
Alterrtatively, the midsole 40 may be molded without inaotpoi-ating the flexplate 30, which is later cemented or othel-wise bonded to the midsole 40. The mold (not shown) may include a textured surface to give the midsole 40 texture to increase friction between the toot and the midsole 40. After the midsole 40 has cured, the apertures 46 are cut using a die 'The apet-tures 46 allow the strapping system 50 to pass through the midsole 40. If desired, the apertui-es 46 can be formed as an integral part of the midsole 40 molding process using appropriately located pins (not shown).
The air-cushioning device 42 is prefei-ably manufactured using conventional techniques and apparatuses and therefore, will riot be described in detail.
The air-cushioning device 42 may be made out of a variety of conventional materials, selected to provide the proper amount of cushioning undei- load. The air-cushioning device 42 may be cemented, fiictionally fitted, held in place by the strapping system 50, or otherwise secured as desired.
The strapping systetn 50 is preferably made using conventional nylon webbing straps that ai-e well known in the art. The individual pieces ofi'the strapping system 50 are cut to length and stitched together. The uppei- portion 64 of the medial ankle post 54 is stitched to the front strap 80 and the second stt-ap 92. The lateral ankle post 52 is stitched to the buckle strap 84 and the first sti-ap 90 The lateral and medial ankle posts 52 and 54 are also doubled over and stitched togethei- to provide sufficient stiffness so that the ankle posts 52 and 54 can stand somewhat upright to allomf the wearer tc.) inset-t their foot without having to always adjust or hold the ankle posts 52 and 54. 'The ankle posts 52 and 54 are then inserted through aper-tures 110 and 1 12 and stitched together to fornl a single ankle sti-a.p 56. The ankle posts 52 and 54 may be stitched together, doubled over as shown in Fig. 3 or singly as shown in Fig.
7. The first end 81 ol'the front strap 82 is stitched to the medial ankle post 54. The second end 83 is then inserted and weaved thr-ough apertures 108, 106, 104 and 100 as described above and shown in Fig. 2.
After being inserted through aperture 100, the second end 8.3 of the front strap 82 is attached by adhesive or double-sided tape to the flexplate 30 iri the channel segment 74.
The optional cllannel covers 34 may then be inserted over the front and middle channels 70 and 72 to prevent the fi=ont strap system 80 from bindin, wltile the sole 8 is under load. Next, the outsole 20 is attached by cement or othei-xise bonded to the midsole 40 and flexplate 30.
The above desci-iption is that of a pi-efei-red embodiment of the invention.
Various alterations and changes can be made without departing from the spirit and broader aspects of the invention as defined in the appended claims, which are to be intet-preted in accordance with the pi-inciples of patent law including the doctrine of equivalents.
Claims (29)
1. A sandal comprising:
a sole having an ankle region and a forefoot region, said sole defining a plurality of channels;
a first strap including a first end and a second end and having a length defined between said first and second ends, said first strap extending from said ankle region into said forefoot region, said first strap traversing at least a portion of the sole in at least one of the ankle region and the forefoot region forward of an ankle of a user, said first strap slidably extending through said channels, said first strap crisscrossing itself above said sole in said forefoot region to define a crossover approximately centered over said sole in said forefoot region, said first strap terminating at said second end, said second end fixedly joined with said sole at a location remote from said first end;
and a second strap joined with the first strap, said second strap adapted to pull the first strap across the sole along said length, whereby said first strap tightens through said ankle region and said forefoot region.
a sole having an ankle region and a forefoot region, said sole defining a plurality of channels;
a first strap including a first end and a second end and having a length defined between said first and second ends, said first strap extending from said ankle region into said forefoot region, said first strap traversing at least a portion of the sole in at least one of the ankle region and the forefoot region forward of an ankle of a user, said first strap slidably extending through said channels, said first strap crisscrossing itself above said sole in said forefoot region to define a crossover approximately centered over said sole in said forefoot region, said first strap terminating at said second end, said second end fixedly joined with said sole at a location remote from said first end;
and a second strap joined with the first strap, said second strap adapted to pull the first strap across the sole along said length, whereby said first strap tightens through said ankle region and said forefoot region.
2. The sandal of claim 1 wherein said sole includes a flexplate, said channels disposed below said flexplate.
3. The sandal of claim 2 wherein said channels are defined by said flexplate.
4. The sandal of claim 3 wherein said sole includes at least one cover closing at least one of said channels.
5. A sandal comprising:
a sole having an ankle region and a forefoot region, said sole defining a plurality of channels;
a first strap having a length, said strap extending from said ankle region into said forefoot region, said strap slidably extending through said channels, said strap crisscrossing above said sole in said forefoot region to define a crossover approximately centered over said sole in said forefoot region;
a second strap joined with said first strap, said second strap adapted to pull along said length, whereby said first strap tightens through said ankle region and said forefoot region;
wherein said sole includes a flexplate defining the channels, said channels disposed below said flexplate;
wherein said sole includes at least one cover closing at least one of said channels; and wherein said flexplate includes shoulders extending along at least one of said channels, said at least one cover fitted within said channel against said shoulders.
a sole having an ankle region and a forefoot region, said sole defining a plurality of channels;
a first strap having a length, said strap extending from said ankle region into said forefoot region, said strap slidably extending through said channels, said strap crisscrossing above said sole in said forefoot region to define a crossover approximately centered over said sole in said forefoot region;
a second strap joined with said first strap, said second strap adapted to pull along said length, whereby said first strap tightens through said ankle region and said forefoot region;
wherein said sole includes a flexplate defining the channels, said channels disposed below said flexplate;
wherein said sole includes at least one cover closing at least one of said channels; and wherein said flexplate includes shoulders extending along at least one of said channels, said at least one cover fitted within said channel against said shoulders.
6. The sandal of claim 5 wherein said sole defines a plurality of apertures communicating with said channels, said apertures being located near opposite ends of each of said channels.
7. The sandal of claim 6 wherein said sole includes a midsole, said flexplate at least partially entrapped within said midsole.
8. The sandal of claim 7 wherein said midsole is formed from EVA, said EVA
being impregnated with an antibacterial compound.
being impregnated with an antibacterial compound.
9. The sandal of claim 8 further comprising a medial ankle post and a lateral ankle post, said strap including a first end affixed to at least one of said ankle posts.
10. The sandal of claim 9 wherein said first strap includes a second end, said second end being connected to said sole.
11. The sandal of claim 10 further comprising an adjustable ankle strap extending between said medial ankle post and said lateral ankle post.
12. The sandal of claim 8 further comprising:
a medial ankle post and a lateral ankle post, said strap including a first end affixed to said medial ankle post; and an adjustable-length buckle strap, said buckle strap interconnecting said first strap and said lateral ankle post.
a medial ankle post and a lateral ankle post, said strap including a first end affixed to said medial ankle post; and an adjustable-length buckle strap, said buckle strap interconnecting said first strap and said lateral ankle post.
13. A sandal retaining a foot having opposed lateral and medial edges and joined with an ankle, said sandal comprising:
a sole defining a plurality of channels; and a first strap including a first end and a second end, the first strap extending along a path above the sole and substantially entirely in front of the ankle from the lateral edge toward the medial edge and back toward the lateral edge, the first strap passing through said channels, said strap crisscrossing over itself above the foot to define an X-shaped crossover, said crossover being centered approximately between said lateral and medial edges, the first strap terminating at the second end, wherein the second end is fixedly secured to at least one of the plurality of channels and the sole.
a sole defining a plurality of channels; and a first strap including a first end and a second end, the first strap extending along a path above the sole and substantially entirely in front of the ankle from the lateral edge toward the medial edge and back toward the lateral edge, the first strap passing through said channels, said strap crisscrossing over itself above the foot to define an X-shaped crossover, said crossover being centered approximately between said lateral and medial edges, the first strap terminating at the second end, wherein the second end is fixedly secured to at least one of the plurality of channels and the sole.
14. The sandal of claim 13 wherein said sole defines a plurality of apertures located near said medial and said lateral edges, said apertures being connected to said channels.
15. A sandal retaining a foot having opposed lateral and medial edges, said sandal comprising:
a sole defining a plurality of channels;
a first strap passing through said channels, said strap crisscrossing over itself above the foot to define an X-shaped crossover, said crossover being centered approximately between said lateral and medial edges;
wherein said sole defines a plurality of apertures located near said medial and said lateral edges, said apertures being connected to said channels;
wherein said sole further comprises:
a flexplate extending through at least a portion of said sole, said flexplate being substantially rigid to provide said sole with the desired stiffness and rigidity, said flexplate defining said channels; and a midsole defining said apertures.
a sole defining a plurality of channels;
a first strap passing through said channels, said strap crisscrossing over itself above the foot to define an X-shaped crossover, said crossover being centered approximately between said lateral and medial edges;
wherein said sole defines a plurality of apertures located near said medial and said lateral edges, said apertures being connected to said channels;
wherein said sole further comprises:
a flexplate extending through at least a portion of said sole, said flexplate being substantially rigid to provide said sole with the desired stiffness and rigidity, said flexplate defining said channels; and a midsole defining said apertures.
16. The sandal of claim 15 wherein said flexplate is bonded to said midsole.
17. The sandal of claim 16 wherein said midsole is molded about said flexplate.
18. The sandal of claim 17 further comprising a medial ankle post and a lateral ankle post, said ankle posts passing through at least two of said apertures and being interconnected through one of said channels.
19. The sandal of claim 18 further comprising an ankle strap attached to said ankle posts.
20. The sandal of claim 19 wherein said first strap includes a first end and a second end, said first end being attached to at least one of said ankle posts, said second end being secured to said sole.
21. The sandal of claim 20 further comprising a second strap having a first end and a second end, said second strap being length adjustable and extending between said first strap and the other of said ankle posts.
22. A sandal construction for a foot joined with an ankle, comprising:
a sole having an ankle portion, a forefoot portion, an upper portion, a lower portion, a lateral edge and a medial edge, said upper portion defining a plurality of apertures near said lateral and said medial edges, said lower portion defining a plurality of channels, said apertures connecting to said channels;
an ankle post located near said medial edge; and a single strap having a first end and a second end, said first end attached to said ankle post, said strap traversing the sole above the upper portion and forward of the ankle in a path from the medial edge toward the lateral edge and back toward the medial edge, said second end fixedly attached to said sole, the remainder of said first strap slidably passing through said apertures and said channels, said first strap crossing over itself to define an X pattern, said X pattern approximately centered between said lateral and medial edges.
a sole having an ankle portion, a forefoot portion, an upper portion, a lower portion, a lateral edge and a medial edge, said upper portion defining a plurality of apertures near said lateral and said medial edges, said lower portion defining a plurality of channels, said apertures connecting to said channels;
an ankle post located near said medial edge; and a single strap having a first end and a second end, said first end attached to said ankle post, said strap traversing the sole above the upper portion and forward of the ankle in a path from the medial edge toward the lateral edge and back toward the medial edge, said second end fixedly attached to said sole, the remainder of said first strap slidably passing through said apertures and said channels, said first strap crossing over itself to define an X pattern, said X pattern approximately centered between said lateral and medial edges.
23. The sandal of claim 22 wherein said upper portion is formed from EVA.
24. The sandal of claim 23 wherein said upper portion is impregnated with an antibacterial agent.
25. A sandal construction, comprising:
a sole having an upper portion and a lower portion, said upper portion defining a plurality of apertures near said lateral and said medial edges, said lower portion defining a plurality of channels, said apertures being connecting to said channels;
an ankle post located near said medial edge;
a first strap having a first end and a second end, said first end being attached to said ankle post, said second end being attached to said sole, said first strap slidably passing through said apertures and said channels, said first strap crossing over itself to define an X pattern, said X pattern approximately centered between said lateral and medial edges;
wherein said upper portion is formed from EVA;
wherein said upper portion is impregnated with an antibacterial agent; and wherein said lower portion is manufactured from a plate of polymeric amide, said plate being shaped to define said channels.
a sole having an upper portion and a lower portion, said upper portion defining a plurality of apertures near said lateral and said medial edges, said lower portion defining a plurality of channels, said apertures being connecting to said channels;
an ankle post located near said medial edge;
a first strap having a first end and a second end, said first end being attached to said ankle post, said second end being attached to said sole, said first strap slidably passing through said apertures and said channels, said first strap crossing over itself to define an X pattern, said X pattern approximately centered between said lateral and medial edges;
wherein said upper portion is formed from EVA;
wherein said upper portion is impregnated with an antibacterial agent; and wherein said lower portion is manufactured from a plate of polymeric amide, said plate being shaped to define said channels.
26. The sandal of claim 25 further comprising at least one cover, said cover enclosing at least one of said channels to define a substantially rigid passage for said strap.
27. A sandal construction comprising:
a sole having an ankle region and a forefoot region and including an outsole, a midsole disposed above said outsole, said outsole and said midsole defining a plurality of channels extending laterally across said sole;
a strapping system having an ankle strap and a front strap, said ankle strap extending across said sole substantially only in a location rearward of a heel of a foot in said ankle region to retain the heel of the foot said front strap separate from the ankle strap, extending from said ankle region to said forefoot region, said front strap slidably passing through said channels and crisscrossing itself above said midsole to define a crossover in said forefoot region, said crossover being substantially laterally centered in said forefoot region, said front strap terminating at an end, said end fixedly secured within at least one of said plurality of channels; and a buckle coupled to said front strap, in a manner enabling a user to loosen and tighten said front strap in said ankle region and said forefoot region.
a sole having an ankle region and a forefoot region and including an outsole, a midsole disposed above said outsole, said outsole and said midsole defining a plurality of channels extending laterally across said sole;
a strapping system having an ankle strap and a front strap, said ankle strap extending across said sole substantially only in a location rearward of a heel of a foot in said ankle region to retain the heel of the foot said front strap separate from the ankle strap, extending from said ankle region to said forefoot region, said front strap slidably passing through said channels and crisscrossing itself above said midsole to define a crossover in said forefoot region, said crossover being substantially laterally centered in said forefoot region, said front strap terminating at an end, said end fixedly secured within at least one of said plurality of channels; and a buckle coupled to said front strap, in a manner enabling a user to loosen and tighten said front strap in said ankle region and said forefoot region.
28. The sandal of claim 27 further comprising a plate disposed between said outsole and said midsole, said channels being defined between said plate and said outsole.
29. A sandal construction comprising:
a sole having an ankle region and a forefoot region:
a midsole disposed above said outsole;
said outsole and said midsole defining a plurality of channels extending laterally across said sole;
a strapping system having;
an ankle strap extending across said sole in said ankle region to retain a heel of a foot;
a front strap extending from said ankle region to said forefoot region, said front strap slidably passing through said channels and crisscrossing above said midsole to define a crossover in said forefoot region, said crossover being substantially laterally centered in said forefoot region;
an adjustment means for adjusting said front strap in relation to said sole, said adjustment means loosening and tightening said strap in said ankle region and said forefoot region;
comprising a plate disposed between said outsole and said midsole, said channels being defined between said plate and said outsole;
wherein said plate defines shoulders extending along opposite sides of at least one of said channels; and further comprising a cover fitted into said channel in engagement with said shoulders.
a sole having an ankle region and a forefoot region:
a midsole disposed above said outsole;
said outsole and said midsole defining a plurality of channels extending laterally across said sole;
a strapping system having;
an ankle strap extending across said sole in said ankle region to retain a heel of a foot;
a front strap extending from said ankle region to said forefoot region, said front strap slidably passing through said channels and crisscrossing above said midsole to define a crossover in said forefoot region, said crossover being substantially laterally centered in said forefoot region;
an adjustment means for adjusting said front strap in relation to said sole, said adjustment means loosening and tightening said strap in said ankle region and said forefoot region;
comprising a plate disposed between said outsole and said midsole, said channels being defined between said plate and said outsole;
wherein said plate defines shoulders extending along opposite sides of at least one of said channels; and further comprising a cover fitted into said channel in engagement with said shoulders.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/045,136 US6637130B2 (en) | 2001-10-23 | 2001-10-23 | Sandal strapping system |
| US10/045,136 | 2001-10-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2405216A1 CA2405216A1 (en) | 2003-04-23 |
| CA2405216C true CA2405216C (en) | 2007-11-27 |
Family
ID=21936181
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002405216A Expired - Fee Related CA2405216C (en) | 2001-10-23 | 2002-09-25 | Sandal strapping system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6637130B2 (en) |
| EP (1) | EP1306023A3 (en) |
| CA (1) | CA2405216C (en) |
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| US2038151A (en) * | 1932-07-23 | 1936-04-21 | Carl G Wernmark | Sandal |
| US2090675A (en) * | 1935-11-05 | 1937-08-24 | United Shoe Machinery Corp | Manufacture of shoes |
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| AU1358183A (en) * | 1982-04-15 | 1983-10-20 | Slaughter, J.H. | Footwear |
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| US6237250B1 (en) * | 1999-07-28 | 2001-05-29 | South Cone, Inc. | Sandal having active self-adjusting harness and method |
-
2001
- 2001-10-23 US US10/045,136 patent/US6637130B2/en not_active Expired - Fee Related
-
2002
- 2002-09-25 CA CA002405216A patent/CA2405216C/en not_active Expired - Fee Related
- 2002-10-16 EP EP02257176A patent/EP1306023A3/en not_active Withdrawn
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| CA2405216A1 (en) | 2003-04-23 |
| EP1306023A3 (en) | 2003-09-10 |
| US6637130B2 (en) | 2003-10-28 |
| EP1306023A2 (en) | 2003-05-02 |
| US20030074806A1 (en) | 2003-04-24 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |