WO2018160467A1 - Dispositif pour taquets de piston rétractables - Google Patents

Dispositif pour taquets de piston rétractables Download PDF

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Publication number
WO2018160467A1
WO2018160467A1 PCT/US2018/019587 US2018019587W WO2018160467A1 WO 2018160467 A1 WO2018160467 A1 WO 2018160467A1 US 2018019587 W US2018019587 W US 2018019587W WO 2018160467 A1 WO2018160467 A1 WO 2018160467A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cleat
cleats
inverted
inverted ramp
Prior art date
Application number
PCT/US2018/019587
Other languages
English (en)
Inventor
Michael William HAUGHEY
Original Assignee
Haughey Michael William
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Haughey Michael William filed Critical Haughey Michael William
Publication of WO2018160467A1 publication Critical patent/WO2018160467A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43C—FASTENINGS OR ATTACHMENTS OF FOOTWEAR; LACES IN GENERAL
    • A43C15/00—Non-skid devices or attachments
    • A43C15/14—Non-skid devices or attachments with outwardly-movable spikes
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/28—Soles; Sole-and-heel integral units characterised by their attachment, also attachment of combined soles and heels
    • A43B13/36—Easily-exchangeable soles
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/16—Overshoes
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43C—FASTENINGS OR ATTACHMENTS OF FOOTWEAR; LACES IN GENERAL
    • A43C15/00—Non-skid devices or attachments
    • A43C15/06—Ice-gripping devices or attachments, e.g. ice-spurs, ice-cleats, ice-creepers, crampons; Climbing devices or attachments, e.g. mountain climbing irons
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43C—FASTENINGS OR ATTACHMENTS OF FOOTWEAR; LACES IN GENERAL
    • A43C15/00—Non-skid devices or attachments
    • A43C15/16—Studs or cleats for football or like boots
    • A43C15/161—Studs or cleats for football or like boots characterised by the attachment to the sole

Definitions

  • the present invention relates generally to retractable spikes, cleats, studs, or similar protrusions (collectively referred to herein as piston cleats) which are configured to extend beyond the surface of an object or to be retracted into the object and "housed" within the body of the object.
  • both children and adults desire specialized footwear for specific activities. For example, individuals wishing to play soccer desire soccer cleats for better performance on soccer fields. Similarly, individuals wishing to play football, typically desire football cleats for better traction on the football field. Many other types of specialize footwear are available including ice cleats for running, cleats for ice fishing, and cleats for ice and snow. However, one of the problems with specialized footwear is that it is difficult to perform different activities while wearing specialized footwear. Driving while wearing football cleats or ice cleats is difficult and dangerous and may cause damage to the brake or gas pedal. Additionally, specialized footwear may cause damage to incompatible surfaces when someone wearing that specialized footwear walks on the incompatible surface.
  • Walking on marble tiles with ice cleats may cause irreparable damage to the marble tiles and may cause the user to slip and fall.
  • the use of specialized footwear in some environments may be downright dangerous. Walking down a wooden staircase with football or soccer cleats may cause the individual to slide on the wooden stairs and to fall down the stairs. Walking on a carpeted staircase with ice cleats may cause the person to fall down the stairs if a cleat gets caught in the carpet.
  • a driver may prefer to drive on tires with cleats in icy conditions or a different type of cleat in snowy conditions.
  • a driver of an all-terrain vehicle (ATV) may prefer to use cleats in icy conditions or different types of cleats in other conditions.
  • a retractable piston cleat system comprising at least one inverted ramp wherein the at least one inverted ramp includes at least a first portion, a second portion and a third portion; at least one piston cleat is in contact with the inverted ramp, the piston cleat includes a spring positioned so that at least a portion of the spring is positioned around at least a portion of the longitudinal axis of the piston cleat; and a lever arm which when activated causes the inverted ramp to transition between the first portion through the second portion and to the third portion thereby causing the piston cleat to move from a first position to a second position.
  • a method of moving a piston cleat between an extended position and a retracted position comprising the steps of: positioning at least one inverted ramp such that the head of the piston cleat is in contact with a portion of the inverted ramp; connecting a lever arm to the inverted ramp such that movement of the lever arm causes movement to the inverted ramp; positioning a spring around a longitudinal axis of the piston cleat; wherein movement of the lever arm in a first direction causes the inverted ramp to move such that a highest portion of the inverted ramp is positioned above the head of the piston cleat; wherein movement of the lever arm in a second direction causes the inverted ramp to move such that a lowest portion of the inverted ramp is positioned above the head of the piston cleat; compressing a spring positioned around the longitudinal axis of the piston cleat when the lever arm is moved in such a way that the lowest portion of the inverted ramp is positioned above the head of the piston cleat; extending a bottom of the piston cleat such that
  • FIG. 1 is a cross sectional side view of a portion of a device showing an inverted ramp and a piston cleat wherein the piston cleat is in a retracted position;
  • FIG. 2 is a cross sectional side view of a portion of a device showing an inverted ramp and a piston cleat wherein the piston cleat is in an extended position;
  • FIG. 3 is top down view of the forefoot portion of a shoe including one embodiment of the invention
  • FIG.4 shows the relative positioning of heel and forefoot mechanisms and the path of a cable connecting them
  • FIG. 5A shows a top portion of a sole of a removable embodiment of the present invention
  • FIG. 5B shows a side view of the removable embodiment of FIG. 5A
  • FIG. 5C shows a bottom view of the sole of the removable embodiment of FIG 5A
  • FIG. 5D shows the sole of the removable embodiment of FIG. 5A
  • FIG. 5E shows the removable embodiment of FIG. 5A
  • FIG. 6 shows a cross sectional side view of a portion of an embodiment of the device including three piston cleats
  • FIG. 7 shows a side view of a switching mechanism which may be used to retract or extend the piston cleats
  • FIG. 8 shows a side view of another removable embodiment of the present invention.
  • FIG. 9 shows an end view of a toe and heel section of an embodiment of the present invention.
  • FIG. 10 shows a bottom view of an embodiment which permits adjustment of the length of the device
  • FIG. 11A shows an overhead view (cutaway) of a tire which incorporates one embodiment of the piston cleats of the present invention
  • FIG. 11B shows a sideview of a tire including the embodiment of the invention shown in FIG. 11A;
  • FIG. 12 shows an overhead view (cutaway) of a tire which incorporates another embodiment of the piston cleats of the present invention.
  • This invention relates to retractable spikes, cleats, studs, or similar protrusions
  • piston cleats which have at least a first and second position.
  • first position for example
  • the piston cleats are housed within the sole of the device such that no portion of the piston cleat is exposed.
  • second position for example
  • at least a portion of the piston cleat is extended outside the device such that it can make contact with a surface.
  • additional positions are available.
  • an embodiment of the invention can include a third position in which a larger portion of the piston cleat is exposed or additional positions in which additional lengths of the piston cleats extend out of the surface.
  • the device may be attached to the bottom of other footwear owned by the user.
  • the device containing the piston cleats may be imbedded in a sandal type of sole which is attached by the user to the underside of other shoes or boots.
  • the device may be incorporated into the sole of the user's shoe, boot, or other footwear.
  • the piston cleats consist of "ice" spikes
  • the purpose of the device is to provide the user with additional traction when walking or running in icy conditions.
  • the invention may be embedded into a tire of a car, an ATV, a bicycle, or other wheeled vehicles such that the piston cleats may be retracted into the tire or extended such that a portion of the piston cleats are extended out beyond the surface of the tire.
  • the piston cleats may be retracted into the tire or extended such that a portion of the piston cleats are extended out beyond the surface of the tire.
  • the current invention solves the problems described by permitting the user to extend or retract piston cleats easily and nearly instantaneously whenever extension of the piston cleats is advisable or desired.
  • the present invention does not use gears to retract or expose the piston cleats. Rather, the present invention employs a system of angled inverted ramps within channels to deploy the piston cleats.
  • a retracted position the highest point of the ramp is positioned above the piston cleat such that the ramp is not causing a portion of the piston cleat to protrude outside the device.
  • a compression spring helps to ensure that no portion of the piston cleat protrudes outside the device.
  • the lowest point of the ramp is positioned above the piston cleat such that the ramp is causing a portion of the piston cleat to protrude outside the device. In this position, the compression spring is compressed.
  • FIG. 1 is a cross sectional side view of a portion of the device showing an inverted ramp
  • inverted ramp 110 includes a highest portion 180, a lowest portion 190 and a sloping ramp between the highest portion 180 and the lowest portion 190.
  • piston cleat 120 includes a rounded head and a cylindrical bottom.
  • Fig. 1 also shows the direction of movement 160 of the inverted ramp 110 and the direction of movement 170 of the piston cleat 120. In the configuration shown in FIG. 1, the inverted ramp 110 is in a retracted position, in which the highest portion 180 of inverted ramp 110 is positioned over piston cleat 120.
  • inverted ramp 110 When the highest portion 180 of inverted ramp 110 is positioned over piston cleat 120, compression spring 130 is in its extended position thus ensuring that no portion of piston cleat 120 extends below the bottom of sole 150.
  • the piston cleat 120 extends through a hole in the bottom of sole 150.
  • Top cover 140 advantageously secures inverted ramp 110, piston cleat 120, and compression spring 130 in place and onto sole 150.
  • Compression spring 130 is positioned around the longitudinal axis of the piston cleat 120.
  • FIG. 2 is a cross sectional side view of a portion of the device again showing inverted ramp 110, piston cleat 120, compression spring 130, top cover 140, and the portion of the sole 150.
  • the inverted ramp 110 is in an extended position, in which the lowest portion 190 of inverted ramp 110 is positioned over piston cleat 120.
  • compression spring 130 is in its compressed configuration and a portion of piston cleat 120 extends below the bottom surface of sole 150.
  • inverted ramp 110 could include additional positions which would ensure that different lengths of the piston cleat are extended beyond the surface of sole 150.
  • One way to include additional positions is to include additional tiers (or positions) on the inverted ramp allowing the activation arm to stop at different intervals corresponding to different lengths of cleat extension.
  • FIG. 3 is an overhead view of the forefoot portion of the device installed in a shoe with the top cover removed.
  • Several inverted ramps 110 (FIG. 3 shows the underside of the inverted ramps) and piston cleats 120 (FIG. 3 shows the tops of the piston cleats which are located below the inverted ramps) may be aligned in a pattern to work in cooperation with a coordinating device. When a coordinating device is included, all such piston cleats 120 are then moved up and down simultaneously (or near simultaneously).
  • FIG. 3 is an overhead view of the forefoot portion of the device installed in a shoe with the top cover removed.
  • FIG. 3 shows the top portion of four piston cleats 120, the non-ramped portion (the top portion) of four inverted ramps 110, in which the four inverted ramps 110 are configured in a coordinating device such as circular disc 310 centered around fixed center axle 320.
  • a lever arm 330 which can be moved by the user between a first position 340 and a second position 350 along arc 360. In this configuration lever arm 330 extends out of a slot from the side of surrounding sole area 150.
  • each of the four piston cleats 120 are in the retracted position and each of the four respective compression springs (not shown in FIG. 3) are in their extended configuration.
  • each of the four piston cleats 120 are in their extended position and each of the four respective compression springs (not shown in FIG. 3) are in their retracted (or compressed) configuration.
  • each position corresponds to different lengths of the piston cleats extending below the surface.
  • the use of the circular disc 310 (which includes an inverted ramp for each piston cleat) ensures that each of the piston cleats 120 extends at the same time (or nearly the same time), when the lever arm 330 is moved from the retracted position to the extended position.
  • first position 340 of lever arm 330 could correspond to the extended position of each of the four piston cleats 120 and where the second position 350 of lever arm 330 could correspond to the retracted position of each of the four piston cleats 120.
  • the device could include additional, or fewer, piston cleats than the four piston cleats 120 shown in FIG. 3.
  • the circular disc 310 could be replaced with other designs or shapes.
  • the four inverted ramps could be configured into other shapes, including but not limited to, a square, a triangle, or other shapes so long as the inverted ramps were positioned such that movement of the shape would cause the piston cleats to transition from the retracted to the extended positions and that, movement of the shape in the other direction, along with the associated compression springs would cause the piston cleats to transition from their extended positions to the retracted positions.
  • inverted ramps can be attached to one another.
  • devices other than the lever arm 330 shown can be used to transition the piston cleats between their retracted and their extended positions.
  • the circular disc 120 could include ridges or other configurations (rather than the lever arm 330) that the user may operate to transition the piston cleats between states.
  • FIG. 4 shows the relative positioning of mechanisms placed in both the heel 410 and the toe 420 of a shoe 430 including a cable 440 connecting the lever (470 and 480) for each of the mechanisms.
  • the mechanisms located in the heel 410 and toe area 420 are separated by and connected to a, for example, rubber (or similar) central section 450 allowing both heel and toe to flex as a shoe or boot does.
  • This complete device would typically be attached to the bottom of a shoe or boot much like a sandal using conventional straps to secure the device to such footwear.
  • the device can also be incorporated as a permanent component entirely within the sole of a boot or shoe.
  • the heel mechanism lever arm 470 can be connected to the toe lever arm 480 by a cable 440 within fixed sleeve 460 allowing a finger movement of the toe lever arm 480 alone to move all piston cleats in the heel and toe simultaneously (or nearly simultaneously).
  • heel mechanism lever arm 470 and the toe lever arm 480 may be
  • FIGS. 5A - 5E show various views of a removable embodiment of the present invention.
  • FIG. 5A shows a top portion of the sole
  • FIG. 5B shows a side view of the sole
  • FIG. 5C shows a bottom view of the sole
  • FIG. 5D shows the sole
  • FIG. 5E shows the removable embodiment (similar to a sandal) encompassing a shoe.
  • the removable embodiment may include peel and stick grip tape 510 to improve the traction between the removable embodiment and the footwear 590 (FIG.
  • FIG. 6 shows a cross sectional side view of a portion of an embodiment of the device including three piston cleats.
  • FIG. 6 shows three inverted ramps 630, three piston cleats 120, three compression springs 130, a top cover 140, and a portion of the sole 150.
  • each of the piston cleats 120 shown in FIG 6 extend through a hole 610 in the sole 150.
  • the shape of the hole 610 is determined by the type or types of compatible cleats. For example, if a device is made to accept both football cleats and ice spikes, the holes 610 would be shaped to accommodate the football cleats because then piston cleats for use with ice and piston cleats for use on football fields would both fit through holes 610.
  • FIG. 6 also shows the direction of movement 160 of the inverted ramps 630 and the direction of movement 170 of the piston cleats 120.
  • FIG. 6 also includes cylindrical sleeves 620 to maintain the position of the piston cleats 120 within sole 150.
  • the inverted ramps 630 are in a retracted position, in which the highest portions 180 of inverted ramps 630 are positioned over piston cleats 120.
  • compression springs 130 are in their extended configuration thus ensuring that no portion of piston cleats 120 extend below the bottom of sole 150.
  • Top cover 140 advantageously secures inverted ramps 630, piston cleats 120, and compression springs 130 in place onto sole 150.
  • the inverted ramps may take on other shapes rather than those shown in FIGS. 1 & 2.
  • the inverted ramps may be configured in any shape that permits a smooth transition between the various positions of the inverted ramp.
  • FIG. 7 shows a side view of a lever arm (or switching mechanism) 710 which may be used to retract or extend the piston cleats 120.
  • FIG. 7 also shows another view of the optional cylindrical sleeves 620.
  • FIG. 7 does not show the inverted ramps positioned above each of the piston cleats 120.
  • FIG. 8 shows a side view of another removable embodiment of the present invention.
  • the removable embodiment of FIG. 8 includes a toe section 810, a heel section 820, a toe stop 830, a heel stop/strap connection 840, an adjustable heel strap 850, an U-shaped strap 860, and a release tab 870.
  • lever arms (or switching mechanisms) 710 are also included in FIG. 8 and the tips of the piston cleats 120 extending beyond the sole 880.
  • FIG. 8 also shows a length adjustable mechanism 890 which includes a length adjusting screw which mates with one of several openings to change the overall length of the device.
  • FIG. 9 shows a toe and end view of a heel section highlighting a first and second portion of the length adjustable mechanism 890.
  • the top portion of FIG. 9 includes a length adjusting screw 910, a first wedge 920 and a second wedge 930.
  • FIG. 9 shows an end view of a toe section highlighting a second portion of the length adjustable mechanism 890 including an opening 940 to accommodate the length adjusting screw 910, and two wedge openings 950 and 960 to accommodate the first wedge 920 and second wedge 930 respectively.
  • Multiple openings 965, 970, 975, and/or 980 may be included within the sole portion 880 to accommodate the length adjusting screw 910 and to adjust the length of the device. Wedge openings would also be included (not shown) to accommodate the first wedge 920 and the second wedge 930 for each corresponding opening 965, 970, 975, 980.
  • FIG. 10 shows a bottom view of an embodiment which permits adjustment of the length of the device.
  • FIG. 10 also shows the relative positioning of mechanisms placed in both the heel 410 and the toe 420 of a shoe 430 including individual lever arms 1010 (for the piston cleats located in the heel area 410) and 1020 (for the piston cleats located in the toe area 420).
  • the mechanisms located in the heel 410 and toe area 420 are separate and not connected. In another embodiment these mechanisms are connected together (See FIG. 4).
  • This complete device would typically be attached to the bottom of a shoe or boot much like a sandal using conventional straps to secure the device to such footwear.
  • the device can also be incorporated as a permanent component entirely within the sole of a boot or shoe.
  • FIG. 10 shows a bottom view of an embodiment which permits adjustment of the length of the device.
  • FIG. 10 also shows the relative positioning of mechanisms placed in both the heel 410 and the toe 420 of a shoe 430 including individual lever arms 1010 (for the piston
  • the retractable piston cleats may be incorporated in other items such as, but not limited to, automobile tires, bicycle tires, and all terrain vehicle (ATV) tires.
  • the invention is incorporated similarly as described above with inverted ramps including a high portion and a low portion of the inverted ramp and a lever arm to transition the lever arm (or a similar device) between the high portion and the low portion being positioned over the piston cleat.
  • the level arm may be replaced with a screw (or similar device) such that when the screw is turned, the position of the inverted ramp is changed.
  • the lever arm may be replaced with an air bladder such that when air is introduced into the air bladder, the ends of the piston cleats are extended beyond the surface of the tire.
  • the piston cleats may be divided between several different lever arms such that a portion of the piston cleats may be extended (or retracted) at a time.
  • the piston cleats may be divided between four different lever arms in each tire so that the piston cleats on the portion of the tire that is not touching the ground (such as a driveway or a roadway) may be extended without affecting the piston cleats in the portion of the tire that is touching the ground.
  • a portion of the piston cleats may be extended and then, once the car is moved a short distance, the other piston cleats on that tire may also be extended.
  • the car, or a portion of the car may be lifted up off of the ground, by way of a lift or a car jack, such that all of the piston cleats on the tire that is no longer touching the ground may be extended at one time.
  • FIG. 11A shows an overhead view (cutaway) of a tire which incorporates one embodiment of the piston cleats of the present invention.
  • This embodiment shows the sidewalls of the tire 1110, a box 1120 (for example, a metal box) which completely surrounds and protects the majority of the components of the retractable piston cleat system, a screw driver insert 1130 at the end of an activation rod 1140, teeth 1150 attached to the circular disc 1190, which meshes with worm gears 1160 which are attached to activation rod 1140.
  • screw driver insert 1130, activation rod 1140, teeth 1150 and worm gears 1160 are used to expose or retract piston cleats 120 and replace the lever arm described in other embodiments.
  • Activation rod 1140 is held in position by forward stabilizer 1170 and rear stabilizer 1180.
  • a stop (not pictured) may be included in either, or both, stabilizers 1170 and 1180 to prevent activation rod 1140 from becoming unattached to stabilizers 1170 and 1180.
  • Activation rod 1140 and stabilizers 1170 and 1180 may include matching threads to ensure precise coordination between activation rod 1140 and stabilizers 1170 and 1180.
  • circular disc 1190 turns which causes the piston cleats to be retracted or extended.
  • the interaction between the turning of the circular disc 1190 and the extension/retraction of the piston cleats is explained the same as, or substantially the same as previously with respect to the descriptions of FIGS. 1-3.
  • the screw driver insert 1130 may be replaced with other devices such as, but not limited to, a head of a bolt which can be turned using a socket and a ratchet.
  • FIG. 11B shows a sideview of the embodiment of the invention shown in FIG. 11A.
  • a curved metal box 1120 is clearly shown.
  • FIG. 11B also shows the inverted ramps 110, piston cleats 120, compression springs 130, and top covers 140.
  • the inverted ramps 110 are in extended positions, in which the lowest portions 190 of inverted ramps 110 are positioned over piston cleats 120.
  • compression springs 130 are in their compressed configurations and portions of piston cleats 120 extends outside the tire.
  • inverted ramps 110 could include additional positions which would ensure that different lengths of the piston cleats can be extended outside the tire 1190.
  • FIG. 12 shows an overhead view (cutaway) of a tire which incorporates another embodiment of the piston cleats of the present invention. This embodiment is similar to the embodiment described in FIG. 11 A, except in this case the activation rod 1140 is activating four circular discs 1190 rather than the two circular discs shown in FIG. 11A.
  • the piston cleats may be replaceable with another type of piston cleats.
  • one pair of shoes may be configured to use soccer cleats, or football cleats by replacing the soccer cleats with football cleats or vice versa. This embodiment would permit the user to own one pair of shoes which permit cleats and then to replace the cleats with cleats for specific activities such as football or soccer.
  • the piston cleats are replaceable by removing the top cover plate and the disc beneath the top cover plate.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

L'invention concerne un système de taquet de piston rétractable qui comprend au moins une rampe inversée en contact avec au moins un taquet de piston et positionnée pour faire passer celui-ci d'une position rétractée à une position étendue lorsqu'un bras de levier, ou un dispositif similaire, est déplacé entre une première et une seconde position. Dans un autre mode de réalisation, de multiples rampes inversées sont utilisées pour faire passer simultanément de multiples taquets de piston entre des positions rétractée et étendue.
PCT/US2018/019587 2017-03-02 2018-02-23 Dispositif pour taquets de piston rétractables WO2018160467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762465863P 2017-03-02 2017-03-02
US62/465,863 2017-03-02

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WO2018160467A1 true WO2018160467A1 (fr) 2018-09-07

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1026434S1 (en) * 2022-06-27 2024-05-14 Joybees LLC Footwear

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375729A (en) * 1981-07-29 1983-03-08 Buchanen Iii Wiley T Footwear having retractable spikes
US5732482A (en) * 1995-09-22 1998-03-31 Retractable Spike System, L.L.C. Retractable spike system for shoes
US5956870A (en) * 1997-11-03 1999-09-28 Grossman; Gerald Shoes with retractable spikes and method for use thereof
WO2015120552A1 (fr) * 2014-02-12 2015-08-20 Advanced Traction Technologies Inc. Ensemble de crampons rétractables pour article chaussant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1487976A (en) * 1923-04-02 1924-03-25 Rossi Joseph Shoe heel
US7926205B2 (en) * 2005-09-30 2011-04-19 Grip Force Technologies Ab Sole arrangement and shoe
US8127470B2 (en) * 2007-12-17 2012-03-06 Connor Robert A Footwear with projections activated by horizontal sliding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375729A (en) * 1981-07-29 1983-03-08 Buchanen Iii Wiley T Footwear having retractable spikes
US5732482A (en) * 1995-09-22 1998-03-31 Retractable Spike System, L.L.C. Retractable spike system for shoes
US5956870A (en) * 1997-11-03 1999-09-28 Grossman; Gerald Shoes with retractable spikes and method for use thereof
WO2015120552A1 (fr) * 2014-02-12 2015-08-20 Advanced Traction Technologies Inc. Ensemble de crampons rétractables pour article chaussant

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