NL2003448C2 - Sports shoe comprising a sole provided with a grip enhancing structure. - Google Patents

Sports shoe comprising a sole provided with a grip enhancing structure. Download PDF

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Publication number
NL2003448C2
NL2003448C2 NL2003448A NL2003448A NL2003448C2 NL 2003448 C2 NL2003448 C2 NL 2003448C2 NL 2003448 A NL2003448 A NL 2003448A NL 2003448 A NL2003448 A NL 2003448A NL 2003448 C2 NL2003448 C2 NL 2003448C2
Authority
NL
Netherlands
Prior art keywords
grip
movement
detector
sports shoe
detect
Prior art date
Application number
NL2003448A
Other languages
Dutch (nl)
Inventor
Jochem Reijndorp
Original Assignee
Ddsign
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 Ddsign filed Critical Ddsign
Priority to NL2003448A priority Critical patent/NL2003448C2/en
Priority to PCT/NL2010/050553 priority patent/WO2011028114A1/en
Priority to EP10757308A priority patent/EP2475277A1/en
Priority to CN2010800398606A priority patent/CN102573547A/en
Priority to US13/394,488 priority patent/US20120279087A1/en
Application granted granted Critical
Publication of NL2003448C2 publication Critical patent/NL2003448C2/en

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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
    • A43C15/16—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
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/34—Footwear characterised by the shape or the use with electrical or electronic arrangements
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B5/00—Footwear for sporting purposes
    • A43B5/02—Football boots or shoes, i.e. for soccer, football or rugby

Description

SPORTS SHOE COMPRISING A SOLE PROVIDED WITH A GRIP ENHANCING STRUCTURE
The present invention relates to a sports shoe comprising a 5 sole provided with a grip enhancing structure.
To increase the grip of a shoe on a surface, i.e. the ground, it is common in sports to provide shoes with a grip enhancing structure, for instance in the form of studs. The 10 arrangement or structure of the studs may be optimized to provide optimal grip for various movements of the athlete.
For instance during a turn, it may be advantageous to have a decreased grip for one shoe, allowing easy rotation around 15 the foot. It was believed that this decreased grip would reduce injuries to for instance the knees and ankles.
It is therefore known to optimize the arrangement of the studs to allow this decreased grip during a turn. It is 20 further suggested to provide the sole of a sports shoe with rotating parts, for instance is the form of rotating studs or rotating sections provided with a plurality of studs.
However, these solutions still resulted in knee and ankle 25 injuries.
It is therefore goal of the present invention, amongst other goals, to provide a safe and/or efficient sports shoe.
30 The above goal is met by the present invention, amongst other goals, by a sports shoe as defined in the appended claim 1.
2
Specifically, the above goal, amongst other goals, is met by the present invention by a sports shoe comprising a sole provided with a grip enhancing structure, wherein the shoe comprises at least one detector arranged for detecting 5 movement of said shoe and a processor, wherein the grip enhancing structure is moveable between an increased gripping state and a decreased gripping state, wherein the processor is arranged to move the grip enhancing structure between the states based on the detected movement by said 10 detector. By detecting the movement of a sports shoe and adapting the grip to said detected movement, an optimal grip can be provided for said movement. The detector can comprise an acceleration detector and/or a positional detector. The detector may also be arranged to detect the intention of a 15 movement, for instance by detecting and measuring the pressures of the foot on the sole.
The grip of the sole on a surface, in particular the ground, may be increased or decreased by adjusting the stiffness of 20 at least a part of the material of the grip enhancing surface. It is however also possible to adjust the grip by changing the structure and/or shape of the grip enhancing structure, for instance by rearranging the studs or by changing the shape of the studs.
25
It should be noted that although an increased and decreased gripping state are described, it is also possible to adjust the gripping to a state of gripping in between said two mentioned states. The grip enhancing structure may hereto 30 have variable gripping capacities. The processor may therefore be arranged to adjust the gripping of the grip enhancing structure based on the movement detected by the detector. It may for instance be possible to relate the 3 amount of generated grip to the speed of the measured movement.
It should further be noted that with grip, the mechanical 5 resistance between the sole and a surface, for instance the ground, is meant. The grip of the grip enhancing surface can be different for different directions. By detecting the movement of the shoe, the grip can be enhanced for different movements .
10
According to a preferred embodiment of the sports shoe according the invention, the detector is arranged to detect a movement with a component in a plane substantially parallel to the plane of the sole. The grip of the grip 15 enhancing structure can then be adjusted based on the movement of the shoe, for instance a sideways or forward motion .
According to a further preferred embodiment of the sports 20 shoe according the invention, the detector is arranged to detect at least one of a rotational or a translational movement of said shoe, wherein the processor is arranged to move the grip enhancing structure to the increased gripping state upon detection of a translational movement and/or 25 wherein the processor is arranged to move the grip enhancing structure to the decreased gripping state upon detection of a rotational movement. The processor is hereby arranged to provide a decreased grip when a rotation is detected. This allows easy turning for the athlete around said shoe. When a 30 translational movement is detected, the grip is enhanced by the processor.
4
With a rotational movement, a rotational movement around an axis perpendicular to the sole and therefore the underground is meant. When an athlete initiates a turn around said shoe, the processor is arranged to move the grip enhancing 5 structure to the decreased gripping state, facilitating the initiated turn. A translational movement is a movement substantially straight in the plane parallel to the sole and therefore the surface. When the athlete for instances initiates a forward or sideway movement, the grip enhancing 10 structure is moved to the increased gripping state, allowing the athlete to exert more power during the initiated movement.
According to a further preferred embodiment of the sports 15 shoe according the invention, the grip enhancing structure is further moveable to an intermediate gripping state. The processor can for instance be arranged to move the grip enhancing structure to the intermediate state when no translational or rotational movement is detected.
20
According to a further preferred embodiment of the sports shoe according the invention, the processor is arranged to hold the grip enhancing structure in a resting state chosen from one of the states of the grip enhancing structure, 25 wherein the processor is arranged to move the grip enhancing structure to another state upon detection of a movement by the detector. The grip enhancing structure is hereby in its resting state, unless a movement is detected. The resting state may be induced by the processor or more preferably the 30 resting state is the natural state of the grip enhancing structure. When no signals are provided to the grip enhancing structure, the grip enhancing structure assumes its resting state.
5
It can be advantageously when the increased gripping state is the resting state. The detector may then me arranged to only detect a rotational movement. In case a rotational 5 movement is detected, the processor is arranged to move the grip enhancing structure to the decreased gripping state. After the rotational movement, the grip enhancing structure moves back to the resting state, in this case the increased gripping state.
10
According to a further preferred embodiment of the sports shoe according to the invention, the detector extends on the sole, wherein the detector is arranged to detect movement between the sole and a surface, in particular the ground.
15 Detecting movement between the ground and the sole results in an accurate measurement of the movement of the shoe and allows efficient adaptation of the grip enhancing structure to said movement. The detector may for instance comprise a visual or a force detecting detector.
20
According to a further preferred embodiment of the sports shoe according to the invention, the detector is arranged to detect deformation of at least a part of the grip enhancing structure. Deformation of the grip enhancing structure is a 25 good predictor of the initiated movement of the shoe. More preferably, the detector is arranged to detect a component of a deformation force parallel to the plane of the sole.
More preferably the sole comprises at least a first and a 30 second detector, wherein the detectors are arranged to detect respectively a first and a second direction of movement of the shoe, and wherein the detector is arranged to detect a translational movement if the first direction is 6 substantially equal to the second direction and/or wherein the detector is arranged to detect a rotational movement if the first and second direction are substantially different. By detecting the direction of movement of the shoe on two 5 locations, it can be established whether a translational movement or a rotational movement is made by the shoe. In case of a translational movement, the directions of movement of two points of the shoe, preferably the movement of the sole with respect to the ground, are substantially equal. On 10 the other hand, when differing or even opposite directions are measured, the shoe is a rotating movement.
According to a further preferred embodiment of the sports shoe according the invention, the detector comprises at 15 least one piezoelectric element in the grip enhancing structure. Piezoelectric elements, preferably piezoelectric fibres, are capable of generating electrical signals upon deformation. The electrical signals are provided to the processor. Preferably a detector comprises a plurality of 20 piezoelectric elements, allowing the direction of the movement to be detected. The orientation of the elements may hereto be varied.
It should be noted that although piezoelectric elements are 25 used for measuring deformation and thereby the movement of the shoe, it may also be possible to use similar elements which are arranged to generate electric signals due to mechanical changes, in particular strain.
30 According to the invention, the piezoelectric elements in the grip enhancing structure are arranged to generate electrical signals as a result of the movement between said structure and a surface, wherein the processor is arranged 7 to determine the movement of the shoe using said electrical signals .
The generated electrical signals due to the deformation of 5 the piezoelectric elements may be used to power for instance the processor. It is however also possible to provide a separate power source, for instance in the form of a battery.
10 According to a further preferred embodiment of the sports shoe according the invention, the grip enhancing structure comprises studs, wherein at least two of the studs are provided with at least one detector. This results in a reliable determination of the movement of shoe. Preferably, 15 a stud comprises a plurality of piezoelectric elements arranged to detect a direction of movement by the deformation of said stud.
According to a further preferred embodiment of the sports 20 shoe according the invention, the grip enhancing structure comprises at least one piezoelectric element, wherein the processor is arranged to supply electrical signals to said piezoelectric element for moving the grip enhancing structure between the states. Piezoelectric elements are 25 capable to induce deformation when an electrical signal is supplied. The processor is hereto arranged to provide said electrical signals to induce the deformation of the piezoelectric element on basis of the detected movement.
More preferably electric signals are provided to a plurality 30 of piezoelectric elements provided in the grip enhancing structure .
8
Using piezoelectric elements to change the gripping capacities of the grip enhancing structure results in an efficient and reliable shoe compared to for instance the rotating parts known in the art, which are mechanically 5 complex and therefore susceptible to damage and wear.
The processor may be provided with a power source, for instance in the form of a battery, to be able to supply the electrical signals. It may also be possible that the 10 electrical signals generated in the piezoelectric elements of the detector are used to supply the electrical signals to the piezoelectric elements for changing the gripping state.
The resting state of the grip enhancing structure is 15 preferably the state of said structure wherein no electrical signals are provided to the piezoelectric elements. A power efficient shoe is hereby provided. Upon a detected movement, the grip enhancing structure may be moved to another gripping state.
20
Although it may be possible to move between the increased and decreased gripped states by using a single piezoelectric element or a group of piezoelectric elements, it may also be possible to provide in a plurality piezoelectric elements, 25 wherein each piezoelectric element is arranged to move the grip enhancing structure to a different state. It may for instance be possible to change the gripping capacities of the structure by supplying more or less piezoelectric elements or groups thereof with electrical signals. It may 30 also be possible to use different piezoelectric elements to move to the increased or decreased gripping states.
Supplying an electrical signal to a first piezoelectric element may move the structure to the increased gripping 9 state, while supplying an electrical signal to a second piezoelectric element may move the structure to the decreased gripping state. Supplying no signals may leave the structure in the resting state, as an example.
5
Preferably the piezoelectric element is arranged to change the mechanical properties of the grip enhancing structure upon receipt of electrical signals supplied by the processor. The elements can hereto be arranged to increase 10 the stiffness of for instance a stud provided with said elements. By increasing the stiffness, the grip is increased, thereby moving the grip enhancing structure to the increased gripping state.
15 More preferably the piezoelectric element is arranged to change the structural properties of the grip enhancing structure upon receipt of electrical signals supplied by the processor. The deformation of the piezoelectric element may for instance change the orientation of a stud or a plurality 20 of studs, changing the grip of said grip enhancing structure .
According to a further preferred embodiment of the sports shoe according the invention, the piezoelectric element 25 comprises at least one piezoelectric fibre. More preferably a plurality of fibres is provided allowing an efficient modification of the gripping capacity of the grip enhancing structure based on the detected movement. Suitable piezoelectric fibres are known, for instance in the form of 30 Active Fibre Composites.
The present invention is further illustrated by the following Figures, which show a preferred embodiment of the 10 device according to the invention, and are not intended to limit the scope of the invention in any way, wherein: - Figure 1 schematically shows a sports shoe according to 5 the invention; - Figure 2 schematically shows the sole of the sports shoe; 10 - Figures 3, 4a and 4b schematically show the detectors, and; - Figures 5 and 6 schematically show studs of the shoe according to the invention.
15
In figure 1 a soccer shoe 1 according to the invention is shown. The shoe 1 is provided with a sole 2 provided with a grip enhancing structure in the form of studs 3. The sole 2 is shown in more detail in figure 2.
20
As shown, the sole 2 comprises a plurality of studs 3, whereby studs 31, 32 and 33 are separately indicated. The sole is furthermore provided with a processor 4 and a battery (not shown). Each of the studs 3 is connected to the 25 processor 4 using electrical wires, whereby wires 81, 82 and 83 are indicated.
In this example, studs 31 and 32 are provided with detectors to detect the movement of the shoe 1 in the plane parallel 30 to the ground. More particularly, the detectors are arranged to detect a deformation or deflection of the studs 3 due to an initiated movement of the shoe 1 with respect to the ground.
11
In figure 3 an example is shown wherein a single stud 31 comprises a first detector 51 and a second detector 52. Detectors 51 and 52 comprise a plurality of piezoelectric 5 fibers as will be explained more in detail below. The detectors 51 and 52 are each arranged to detect a direction of movement, indicated with the arrows.
Since first detector 51 detects a direction to the left 10 while second sensor 52 detects a direction to the right, it is detected that a rotational movement I is initiated by the shoe 1.
Figure 4a shows an example wherein each of the studs 31 and 15 32 are provided with a single detector 51 respectively 52.
In this example, both detectors 51 and 52 detect a direction of movement in the same direction. It is therefore detected that a translational or rectilinear movement II is initiated by the shoe 1. In figure 4b, the detectors of the studs 31 20 and 32 detect different directions, indicating a rotational movement III. It will be appreciated that not only the type of movement, i.e. rotational or translational, can be detected, but also the direction of said movement by efficient placement of the detectors.
25
In figure 5 a stud 3 is shown in cross-section. The stud 3 is provided with a plurality of piezoelectric fibers 6. In case the stud 3 is arranged to function as an detector, fibers 6 will generate an electrical signal due to 30 deformation, indicated with IV. Fiber 61 will be compressed while fiber 62 will be elongated. Each of the fibers 6 is connected to the electrical wire 8 for transmittal of the generated signals to the processor 4. In order to detect 12 directions of deflection, the stud 3 is provided with a plurality of fibers 6 with different orientations. Each fiber may be provided with a single wire 8 to allow readout of each individual fiber 6.
5
Stud 3 from figure 5 may also function to change the gripping capacity of the grip enhancing structure of the shoe 1. By supplying electrical signals through wire 8 to fibers 8, the properties of the stud 3 may be altered. In 10 this example the stud 3 is arranged to retract on the supply of electrical signals due to the piezoelectric fibers 6. It is however also possible to increase the stiffness of the stud 3 using piezoelectric elements.
15 The stud shown in figure 6 is arranged to rotate around axis X on supply of electrical signals. A piezoelectric element 7 may therefore be arranged. Rotation of the stud 3 and more particular the rotation of a plurality of studs 3 change the structure of the grip enhancing structure, thereby changing 20 the gripping capacities.
In case a rotational movement is detected, as shown for instance in figure 3, the processor is arranged to send signals to a plurality of studs 3 to for instance decrease 25 the stiffness of the studs 3. The shoe 1 is now allowed to rotate efficiently. In case a translational movement is detected, for instance as shown in figure 4a, the processor instructs the studs 3 to increase the stiffness, creating more grip for the athlete to exert power.
The present invention is not limited to the embodiment shown, but extends also to other embodiments falling within the scope of the appended claims. It should hereby be noted 30 13 that although studs are described as gripping enhancing structure, the current invention is also applicable to for instance shoes provided with profile. Changing for instance the height or the stiffness of the profile may therefore 5 change the gripping capacities.

Claims (13)

1. Sportschoen omvattende een zool voorzien van een grip verbeterende structuur, waarbij de schoen ten minste een 5 detector, die is ingericht voor het detecteren van beweging van de schoen, en een verwerkingseenheid omvat, waarbij de grip verbeterende structuur beweegbaar is tussen een verhoogde grip toestand en een verlaagde grip toestand, waarbij de verwerkingseenheid is ingericht om 10 de grip verbeterende structuur tussen de toestanden te bewegen in afhankelijkheid van de gedetecteerde beweging door de detector.1. A sports shoe comprising a sole provided with a grip-improving structure, wherein the shoe comprises at least one detector, which is adapted to detect movement of the shoe, and a processing unit, wherein the grip-improving structure is movable between an increased grip state and a reduced grip state, wherein the processing unit is arranged to move the grip-improving structure between the states in dependence on the detected movement by the detector. 2. Sportschoen volgens conclusie 1, waarbij de detector is 15 ingericht om een beweging met een component in een vlak dat in hoofdzaak parallel is aan het vlak van de zool te detecteren.2. A sports shoe according to claim 1, wherein the detector is adapted to detect a movement with a component in a plane that is substantially parallel to the plane of the sole. 3. Sportschoen volgens conclusie 1 of 2, waarbij de 20 detector is ingericht om ten minste een van een rotatie of een translatie beweging van de schoen te detecteren, waarbij de verwerkingseenheid is ingericht om de grip verbeterende structuur naar de verhoogde grip toestand te bewegen bij een detectie van een translatie beweging 25 en/of waarbij de verwerkingseenheid is ingericht om de grip verbeterende structuur te bewegen naar de verlaagde grip toestand bij detectie van een rotatie beweging.3. A sports shoe according to claim 1 or 2, wherein the detector is adapted to detect at least one of a rotation or translation movement of the shoe, wherein the processing unit is adapted to move the grip-improving structure to the increased grip condition at a detection of a translation movement and / or wherein the processing unit is adapted to move the grip-improving structure to the reduced grip condition upon detection of a rotation movement. 4. Sportschoen volgens conclusie 3, waarbij de grip 30 verbeterende structuur voorts beweegbaar is naar een tussenliggende grip toestand.4. A sports shoe according to claim 3, wherein the grip-improving structure is further movable to an intermediate grip condition. 5. Sportschoen volgens conclusie 3 of 4, waarbij de verwerkingseenheid is ingericht om de grip verbeterende structuur in een rusttoestand te houden, die gekozen is uit een van de toestanden van de grip verbeterende 5 structuur, waarbij de verwerkingseenheid is ingericht om de grip verbeterende structuur naar een andere toestand te bewegen bij detectie van een beweging door de detector.5. A sports shoe as claimed in claim 3 or 4, wherein the processing unit is adapted to keep the grip-improving structure in a rest position selected from one of the states of the grip-improving structure, the processing unit being arranged around the grip-improving structure. to move to another state upon detection of movement by the detector. 6. Sportschoen volgens een van de conclusies 1 tot en met 5, waarbij de detector zich uitstrekt op de zool, waarbij de detector is ingericht om een beweging te detecteren tussen de zool en een oppervlak, in het bijzonder de grond.A sports shoe according to any of claims 1 to 5, wherein the detector extends on the sole, the detector being adapted to detect a movement between the sole and a surface, in particular the ground. 7. Sportschoen volgens een van de voorgaande conclusies 1 tot en met 6, waarbij de detector is ingericht om een deformatie van ten minste een deel van de grip verbeterende structuur te detecteren. 20A sports shoe according to any one of the preceding claims 1 to 6, wherein the detector is adapted to detect a deformation of at least a part of the grip-improving structure. 20 8. Sportschoen volgens conclusie 6 of 7, waarbij de zool tenminste een eerste en een tweede detector omvat, waarbij de detectoren zijn ingericht om respectievelijk een eerste en een tweede richting van beweging van de 25 schoen te detecteren, en waarbij de detector is ingericht om een translatie beweging te detecteren wanneer de eerste richting in hoofdzaak gelijk is aan de tweede richting en/of waarbij de detector is ingericht om een rotatie beweging te detecteren wanneer de eerste 30 en de tweede richting in hoofdzaak verschillend zijn.8. A sports shoe according to claim 6 or 7, wherein the sole comprises at least a first and a second detector, wherein the detectors are adapted to detect a first and a second direction of movement of the shoe, respectively, and wherein the detector is arranged to detect a translational movement when the first direction is substantially equal to the second direction and / or wherein the detector is arranged to detect a rotational movement when the first and second directions are substantially different. 9. Sportschoen volgens een van de voorgaande conclusies 1 tot en met 8, waarbij de detector ten minste piëzo- elektrisch element in de grip verbeterende structuur omvat.The sports shoe of any one of the preceding claims 1 to 8, wherein the detector comprises at least piezoelectric element in the grip-enhancing structure. 10. Sportschoen volgens een van de voorgaande conclusies 6 5 tot en met 9, waarbij de grip verbeterende structuur noppen omvat, waarbij ten minste twee van de noppen zijn voorzien van ten minste een detector.A sports shoe according to any one of the preceding claims 6 to 9, wherein the grip-improving structure comprises studs, wherein at least two of the studs are provided with at least one detector. 11. Sportschoen volgens een van de voorgaande conclusies 1 10 tot en met 10, waarbij de grip verbeterende structuur ten minste een piëzo-elektrisch element omvat, waarbij de verwerkingseenheid is ingericht om elektrische signalen toe te voeren aan het piëzo-elektrische element voor het bewegen van de grip verbeterende structuur 15 tussen de toestanden.A sports shoe according to any one of the preceding claims 1 to 10, wherein the grip-improving structure comprises at least one piezoelectric element, the processing unit being adapted to supply electrical signals to the piezoelectric element for movement of the grip-improving structure 15 between the states. 12. Sportschoen volgens conclusie 11, waarbij het piëzo-elektrische element is ingericht om de mechanische eigenschappen van de grip verbeterende structuur te 20 veranderen bij ontvangst van elektrische signalen die zijn toegevoerd door de verwerkingseenheid.12. A sports shoe according to claim 11, wherein the piezoelectric element is adapted to change the mechanical properties of the grip-enhancing structure upon receipt of electrical signals supplied by the processing unit. 13. Sportschoen volgens conclusie 11 of 12, waarbij het piëzo-elektrisch element is ingericht om de structurele 25 eigenschappen van de grip verbeterende structuur te veranderen bij ontvangst van elektrische signalen die zijn toegevoerd door de verwerkingseenheid.13. A sports shoe according to claim 11 or 12, wherein the piezoelectric element is adapted to change the structural properties of the grip-enhancing structure upon receipt of electrical signals supplied by the processing unit.
NL2003448A 2009-09-07 2009-09-07 Sports shoe comprising a sole provided with a grip enhancing structure. NL2003448C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL2003448A NL2003448C2 (en) 2009-09-07 2009-09-07 Sports shoe comprising a sole provided with a grip enhancing structure.
PCT/NL2010/050553 WO2011028114A1 (en) 2009-09-07 2010-09-02 Sports shoe comprising a sole provided with a grip enhancing structure
EP10757308A EP2475277A1 (en) 2009-09-07 2010-09-02 Sports shoe comprising a sole provided with a grip enhancing structure
CN2010800398606A CN102573547A (en) 2009-09-07 2010-09-02 Sports shoe comprising a sole provided with a grip enhancing structure
US13/394,488 US20120279087A1 (en) 2009-09-07 2010-09-02 Sports Shoe Comprising a Sole Provided with a Grip Enhancing Structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2003448A NL2003448C2 (en) 2009-09-07 2009-09-07 Sports shoe comprising a sole provided with a grip enhancing structure.
NL2003448 2009-09-07

Publications (1)

Publication Number Publication Date
NL2003448C2 true NL2003448C2 (en) 2011-03-08

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NL2003448A NL2003448C2 (en) 2009-09-07 2009-09-07 Sports shoe comprising a sole provided with a grip enhancing structure.

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US (1) US20120279087A1 (en)
EP (1) EP2475277A1 (en)
CN (1) CN102573547A (en)
NL (1) NL2003448C2 (en)
WO (1) WO2011028114A1 (en)

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US20070261271A1 (en) * 2006-05-10 2007-11-15 Krouse Wayne F Active shoe cleat system

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CN102573547A (en) 2012-07-11
US20120279087A1 (en) 2012-11-08
EP2475277A1 (en) 2012-07-18

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