Background Field of the Invention

|0001) Embodiments of the present invention relate to a system for attaching a shoe to a skateboard to inhibit lateral and/or vertical movement of the shoe in relation to the skateboard.

Description of Related Art

[0002] Skateboards provide a surface for a user to stand on and wheels that enable the skateboard and user to roll along a surface. While many users enjoy simply standing on the skateboard while it rolls along a surface or prefer to use the skateboard as a means for transportation, some users would rather use the skateboard to perform complicated stunts or tricks. Such stunts or tricks may involve causing the skateboard to lift from the ground or rapidly changing the positioning or direction of the skateboard.

|0003] Users typically control the skateboard using friction created between the skateboard and shoes that the user is wearing. Such friction may be increased by coating the surface of the skateboard with a tape or other material that induces high amounts of friction. Even so, a user may find it difficult to control the skateboard using friction alone. Not only is it difficult for many beginning users to control the direction towards which the skateboard is rolling while it is on the ground, it is also difficult for advanced users performing stunts or tricks to cause the skateboard to leave the ground and to control the skateboard while it is in the air.

Summary

|0004] One embodiment of the present invention thus includes a system for attaching a shoe to a skateboard. The system comprises a shoe comprising a first interlock structure on an outer portion of the shoe; and a skateboard having a top and a bottom and comprising a second interlock structure extending upward from the top of the skateboard, wherein the second interlock structure is configured to substantially prevent vertical or lateral movement of the shoe in relation to the skateboard when the first interlock structure is transversely pressed against the second interlock structure, wherein the first interlock structure and the second interlock structure register in a plurality of lateral or vertical positions, and wherein the first or second interlock structure comprises a plurality of protrusions.

[0005] Another embodiment includes an interlocking shoe. The interlocking shoe comprises means for securing the shoe to a foot of a user of the shoe; and a first interlock structure attached to an outer portion of the shoe and comprising a plurality of protrusions, wherein the first interlock structure is configured to substantially prevent vertical or lateral movement of the shoe in relation to a second interlock structure when the first interlock structure is transversely pressed against the second interlock structure, and wherein the first interlock structure and the second interlock structure register in a plurality of lateral or vertical positions.

|0006] Yet another embodiment includes an interlocking skateboard. The interlocking skateboard comprises one or more wheels attached to a bottom of the skateboard; and a first interlock structure extending upward from a top of the skateboard and comprising a plurality of protrusions, wherein the first interlock structure is configured to substantially prevent vertical or lateral movement of the skateboard in relation to a second interlock structure when the second interlock structure is transversely pressed against the first interlock structure, and wherein the second interlock structure and the first interlock structure register in a plurality of lateral or vertical positions.

[0007] Further aspects, features and advantages of the present invention will become apparent from the detailed description of certain embodiments that follows.

Brief Description of the Drawings

[0008] The above mentioned and other features of the invention will now be described with reference to the drawings of several embodiments of the present system for attaching a shoe to a skateboard. The illustrated embodiments of the system are intended to illustrate, but not to limit the invention. The drawings contain the following figures: [0009] Figure IA is a side view of a system for attaching a shoe to a skateboard.

[0010] Figure I B is another side view of the system for attaching a shoe to a skateboard of Figure IA.

10011] Figure 2 A is a side view of another embodiment of a system for attaching a shoe to a skateboard.

[0012] Figure 2B is another side view of the system for attaching a shoe to a skateboard of Figure 2 A.

|0013] Figure 2C is another side view of the system for attaching a shoe to a skateboard of Figure 2 A.

[0014] Figure 3 is a perspective view of the shoe and first interlock structure of Figure I A.

[0015] Figure 4 is a perspective view of the skateboard and second interlock structures of Figure IA.

JOOl 6] Figure 5 is a perspective view of a first embodiment of an interlock structure of Figure IA.

[0017] Figure 6 is a side view of a first embodiment of an interlock structure of Figure IA.

[0018] Figure 7 is a perspective view of a first embodiment of an interlock structure, illustrated in Figure 5, pressed against an embodiment of an interlock structure complementary to the first embodiment.

[0019] Figure 8 is another perspective view of a first embodiment of an interlock structure, illustrated in Figure 5, pressed against an embodiment of an interlock structure complementary to the first embodiment.

[0020] Figure 9 is a perspective view of a second embodiment of an interlock structure of Figure IA.

J0021J Figure 10 is a side view of a second embodiment of an interlock structure of Figure I A.

[0022] Figure 1 1 is a front view of a second embodiment of an interlock structure of Figure I A. J0023] Figure 12 is a perspective view of two of a second embodiment of an interlock structure, illustrated in Figure 9, being pressed together.

[0024] Figure 13 is another perspective view of two of a second embodiment of an interlock structure, illustrated in Figure 9, being pressed together.

|0025] Figure 14 is a perspective view of a third embodiment of an interlock structure of Figure IA.

[0026] Figure 15 is a perspective view of a fourth embodiment of an interlock structure of Figure I A.

[0027] Figure 36 is a perspective view of two of a fourth embodiment of an interlock structure, illustrated in Figure 15, being pressed together.

[0028] Figure ] 7 is a perspective view of an embodiment of an interlock structure complementary to a first embodiment of an interlock structure, illustrated in Figure 5.

|0029] Figure 18 is a perspective view of an embodiment of an interlock structure complementary to a second embodiment of an interlock structure, illustrated in Figure 9.

|0030] Figure 19 is a perspective view of an embodiment of an interlock structure complementary to a third embodiment of an interlock structure, illustrated in Figure 14.

10031 j Figure 20 is a perspective view of an embodiment of an interlock structure complementary to a fourth embodiment of an interlock structure, illustrated in Figure 15.

Detailed Description of Certain Embodiments

[0032] The present embodiments of a system for attaching a shoe to a skateboard may be utilized with a variety of types of spoils equipment. It will be understood by one of skill in this art. in light of the present disclosure, that the system disclosed herein can be successfully utilized in connection with types of sports equipment that include binding or attaching a shoe or boot to a board. For example, but without limitation, the system disclosed herein can be configured to attach a shoe or a boot to a skateboard, a snowboard, and/or a wakeboard. One skilled in the art can also find additional applications for the apparatuses and systems disclosed herein. Thus, the illustrations and descriptions of the system for attaching a shoe to a skateboard are merely exemplary of one possible application of the system. [0033] The system for attaching a shoe to a skateboard described herein is especially adapted to arrest vertical and/or lateral movement of the shoe in relation to the skateboard. Thus, a user wearing the shoe can substantially control operation of the skateboard. When the user raises the shoe, the skateboard will raise with the shoe, enabling the user to lift the skateboard into the air. While the board is raised from the ground, the user may lower the shoe, thereby causing the skateboard to lower back towards the ground. Regardless of whether the skateboard is on the ground or raised from the ground, it may be possible for the user to cause the skateboard to move in a lateral direction by shifting the shoe in a Jateral direction.

[0034] The system arrests lateral and/or vertical movement when at least two interlocking structures are transversely pressed together, wherein one interlocking structure is attached to the shoe and the other interlocking structure is attached to the skateboard. In the illustrated embodiments, described in more detail below, the user may press the interlocking structures together in a plurality of vertical and/or lateral positions. Thus, the user is not confined to a single interlocking configuration, but may press the interlocking structures together as convenient or necessary. Additionally, the interlocking structures do not require the user to place the shoe underneath another structure, which may limit the user ^' s freedom of movement, but rather that the user transversely push or pull one of the interlocking structures, attached to the shoe, against the other one of the interlocking structures, attached to the skateboard. Unlike bindings or clips, the engagement systems disclosed herein hold the shoe to the skateboard as long as they are pressed together by the user's feet, and instantly release when the user moves his or her feet away. Engagement and disengagement can be done by simple lateral movement of the feet, and because some embodiments permit the structures to engage in multiple positions, the system does not require the precision of foot placement necessary to engage a binding or clip. This makes it more amenable for use in a high speed action sport such as skateboarding, where engagement and disengagement can be desirable in a fraction of a second. Also, because engagement is maintained only so Jong as the user is affirmatively applying pressure to the interlocking structure, the danger of injury due to nonrelease between the board and the user ^' s foot is small to none. [0035] Figure IA is a side view of the system 10 for attaching a shoe 30 to a skateboard 40. The system 10 comprises shoes 30a and 30b; a skateboard 40; first interlock structures 50a and 50b attached to the shoes 30a and 30b, respectively; and second interlock structures 60a and 60b attached to the skateboard 40. The first interlock structures 50a and 50b may be pressed against and interact with the second interlock structures 60a and 60b.

[0036] The system 10 is illustrated with the first interlock structures 50a and 50b separated from the second interlock structures 60a and 60b. In this configuration, a user of the system 10 may operate the skateboard 40 in the usual manner. It is possible for the user to shift one or both of the shoes 30a and 30b laterally, transversely, or vertically without affecting the positioning of the skateboard 40, or the user may use friction between the shoes 30a and/or 30b and the skateboard 40 to alter the positioning of the skateboard 40. In addition, the user may readily remove one or both of the shoes 30a and 30b from the skateboard 40. such as when the user wishes to carry the skateboard 40 instead of riding it or when the user wishes to dismount from the skateboard 40, such as during the execution of a trick which the user foresees as having a negative outcome.

[0037] The size of the interlock structures 50a, 50b, 60a, and 60b relative to the shoes 30a and 30b and the skateboard 40 is illustrative only. The interlock structures 50a, 50b, 60a, and 60b may be larger or smaller relative to the size of the shoes 30a and 30b, or the interlock structures 50a, 50b, 60a, and 60b may be larger or smaller relative to the size of the skateboard 40. In addition, the interlock structures 50a, 50b, 60a, and 60b may vary in size relative to each other.

|0038] Figure IB is another side view of the system 10, illustrated in Figure IA, for attaching the shoe 30 to the skateboard 40. In Figure IB, the system 10 is illustrated with the first interlock structures 50a and 50b transversely pressed against the second interlock structures 60a and 60b. respectively. To accomplish this, the user of the system 10 shifts one or both shoes 30a and/or 30b towards the second interlock structures 60a and/or 60b, respectively, until the first interlock structures 50a and/or 50b contact the second interlock structures 60a and/or 60b, respectively. In the illustrated embodiment, both shoes 30a and 30b are shifted towards the ends of the skateboard 40 in order to contact the second interlock structures 60a and 60b. As can be seen in Figure J B, when the first interlock structures 50a and 50b are pressed against the second interlock structures 60a and 60b, a portion of the interlock structures 50a and 50b overlaps with a portion of the interlock structures 60a and 60b, respectively. This interaction is described in more detail below.

[0039] Figure 2A is a side view of another embodiment of the system 10 for attaching the shoe 30 to the skateboard 40. In Figure 2A, the interlock structures 50a and 60a of Figure IA, located distal to the shoe 30a, have been replaced by a first interlock structure 50c and a second interlock structure 60c, respectively, located proximal to the shoe 30a. In addition, the system 10 additionally includes a first interlock structure 50d and a second interlock structure 6Od located proximal the shoe 30b. In other words, the interlock structures 50c and 5Od on the skateboard 40 are now located between the shoes 30a and 30b, such that they can be engaged by moving the feet together to engage the interlock structures. This can be instead of or in addition to interlock structures on the skateboard 40 located outside of the shoes 30a and 30b.

|0040] Figure 2B is another side view of the system 30, illustrated in Figure 2A, for attaching the shoe 30 to the skateboard 40. In Figure 2B, the system 10 is illustrated with the first interlock structures 50c and 5Od transversely pressed against the second interlock structures 60c and 6Od, respectively. In the illustrated embodiment, both shoes 30a and 30b are shifted towards the center of the skateboard 40 in order to contact the second interlock structures 60c and 6Od.

[0041] Figure 2C is another side view of the system 10, illustrated in Figure 2A, for attaching the shoe 30 to the skateboard 40. In Figure 2C, the system 10 is illustrated with the first interlock structures 50c and 50b transversely pressed against the second interlock structures 60c and 60b, respectively. In the illustrated embodiment, the shoe 30a is shifted towards the center of the skateboard 40 in order to contact the first interlock structure 60c, and the shoe 30b is shifted towards the end of the skateboard 40 in order to contact the second interlock structure 60b.

J0042 J As can be seen in Figures 2B and 2C, the shoe 30b may be shifted in a plurality of directions in order to contact one of the second interlock structures 60b or 6Od. Alternatively or in addition to this configuration, the system ] 0 may be configured such that the shoe 30a may be shifted in a plurality of directions in order to contact a second interlock structure. In some embodiments, the second interlock structures 60c and 6Od may be combined such that a first interlock structure can engage the combined second interlock structure from either side. Such configuration will be described in more detail below. Those of skill in the art will appreciate that interlock structures may be disposed either proximal or distal, or both proximal and distal, to each shoe 30a or 30b.

[0043] Figure 3 is a perspective view of the shoe 30b and the first interlock structure 50b of Figure IA. The first interlock 50b is attached to an outer surface of the shoe 30b. One of skill in the art will understand that the descriptions of the shoe 30b, the first interlock structure 50b, and the interactions between the first interlock structure 50b and second interlock structure 60b are equally descriptive of the shoe 30a, the first interlock structure 50a, and the interactions between the first interlock structure 50a and second interlock structure 60a.

[0044] In the illustrated embodiment, the shoe 30b has laces 32 to aid in securing the shoe 30b to the user ^' s foot. One skilled in the art will understand that the shoe 30b may comprise means for securing the shoe to the user ^' s foot other than or in addition to the laces 32. For example, but without limitation, the shoe 30b may comprise straps, bands, buckles, elastic cords, or an expanse of material configured to secure the shoe 30b to the user ^' s foot.

|0045] To assist in the description of the components of embodiments of the shoe 30b and the first interlock structure 50b. the following coordinate teπns are used, consistent with the coordinate axes illustrated in Figure 3. A "vertical axis ^" is generally normal to a sole of the shoe 30b. Similarly, when discussing only the first interlock structure 50b independently of the shoe 30b, the "vertical axis ^" is generally normal to a bottom of the interlock structure. A "lateral axis ^" is generally parallel to the first interlock structure 50b, thus running from the toe of the shoe 50b to the heel of the shoe 50b. Similarly, when discussing only the first interlock structure 50b independently of the shoe 30b, the 'lateral axis ^" is generally parallel to the first interlock structure 50b and normal to the vertical axis. A "transverse axis ^'1 extends normal to both the vertical and lateral axes, thus being generally normal to the first interlock structure 50b. In addition, as used herein, "the longitudinal direction ^" refers to a direction substantially parallel to the longitudinal axis; ''the lateral direction ^" refers to a direction substantially parallel to the lateral axis; and "the transverse direction ^" refers to a direction substantially parallel to the transverse axis. Also, the terms "proximal ^" and "distal ^" are used consistently within the description. Thus, proximal and distal are used in reference to the midline of a user s body.

[0046] In the illustrated embodiment, the first interlock structure 50b is dϊstally attached to an outer surface of the shoe 30b. Such placement of the first interlock structure 50b allows the user to shift the shoe 30b and the first interlock structure 30b towards an end of the skateboard 40 to engage the first interlock structure 50b with the second interlock structure 60b. In another embodiment, the first interlock structure 50b may be proximally attached to an outer surface of the shoe 30b, allowing the user to shift the shoe 30b and the first interlock structure 50b towards the center of the skateboard 40 to engage the first interlock structure 50b with the second interlock structure 60b. Such configuration is illustrated in Figure 2A with respect to the shoe 30a and the interlock structures 50c and 60c.

|0047] In yet another embodiment, a plurality of interlock structures may be attached to the shoe 30b such that there is at least one interlock structure proximally attached and at least one interlock structure distally attached. This configuration is illustrated in Figure 2A with respect to the shoe 30b and the first interlock structures 50b and 50d. The plurality of interlock structures may be substantially identical or may differ in form and shape.

|0048] In the illustrated embodiment, the first interlock structure 50b is approximately laterally centered along the shoe 50b and spans only a portion of the lateral length of the shoe 30b. Such centering may increase the user ^' s control of the skateboard 40. The user can push up or pull down with the toe and/or heel of the shoe 30b to operate the system, as opposed to only being able to use the toe or heel area of the shoe 30b for control. Additionally, locating the first interlock structure 50b at a lateral center of the shoe 30b may decrease a foot fatigue that the user experiences after lengthy operation. In another embodiment, the first interlock structure 50b may be located at a different lateral location along the shoe 30b or the first interlock structure may span approximately the entire lateral length of the shoe 30b. In yet another embodiment, a plurality of interlock structures may be attached along the lateral length of the shoe 30b. The plurality of interlock structures may be substantially identical or may differ in form and shape. [0049] In the illustrated embodiment, the bottom of the first interlock structure 50b is aligned with the bottom of the shoe 30b, but does not extend to the top of the shoe 30b. Such configuration may ensure that the user is able to engage the first interlock structure 50b with the second interlock structure 60b at a point vertically proximate to the skateboard 40. Engaging the first interlock structure 50b with the second interlock structure 60b in this way may increase user control of the skateboard 40 and response of the skateboard 40 to the user's movements. In another embodiment, the first interlock structure 50b may be positioned so that it is not aligned with the bottom of the shoe 30b. For example, the first interlock structure 50b may be angled with respect to the bottom of the shoe 30b, may be located higher up on the shoe 30b, or may span approximately the entire vertical height of the shoe 30b. In yet another embodiment, a plurality of interlocks structure may be attached along the vertical height of the shoe 30b.

[0050J The first interlock structure 50b may be permanently attached to the shoe 30b or releasably attached to the shoe 30b. For example, the first interlock structure 50b may be permanently bonded to the shoe 30b, such as by use of a permanent adhesive, by sewing, or by forming the first interlock structure to be integral with a portion of the shoe 30b. The first interlock structure 50b may also be releasably attached to the shoe 30b, such as by use of complementary hook and loop areas disposed on the first interlock structure 50b and the shoe 30b. When pressed together, the complementary hook and loop areas attach, thereby securing the first interlock structure 50b to the shoe 30b in a configuration substantially similar to the configuration illustrated in Figure 3.

[0051] The embodiments described above may be selected at manufacturing. For example, a manufacturer of the system 10 of Figure I A may attach the first interlock structure 50b to the shoe 30b in a specific position, or the manufacturer may produce several models of the system 10 in which the first interlock structure 50b is attached to different locations along the shoe 30b. Placement of the first interlock structure 50b can be accomplished by permanently attaching the first interlock structure 50b at a predetermined location along the shoe 30b. or by placing a hook or loop area at a predetermined location along the shoe 30b for the first interlock structure 50b to attach to. for example.

~J 0- [0052] Alternatively, the user may be able to select the positioning of the first interlock structure 50b aJong the shoe 30b. The user may be provided with the first interlock structure 50b and an adhesive to attach the first interlock structure 50b to a shoe belonging to the user or to a provided shoe. In the case of the first interlock structure 50b being capable of releasably attaching to the shoe 30b, for example by use of complementary hook and loop areas, the user may be able to choose where to place the hook or loop area on a shoe of the user or on a provided shoe, or the user may be able to choose where to contact the first interlock structure 50b to the shoe 30b once the hook and Joop areas are disposed on the first interlock structure 50b and the shoe 30b.

[0053J Figure 4 is a perspective view of the skateboard 40 and the second interlock structures 60a and 60b of Figure IA. Although description will primarily be made to a skateboard having two second interlock structures 60a and 60b on a top 42 of the skateboard 40, one skilled in the art will understand that only one interlock structure or more than two interlock structures can be attached to the top 42.

|0054] To assist in the description of the components of embodiments of the skateboard 40 and the interlocking structures 60a and 60b. the following coordinate terms are used, consistent with the coordinate axes illustrated in Figure 4 and the coordinate terms described in reference to Figure 3. A "vertical axis'' is generally normal to the top 42. A "lateral axis' ^" is generally parallel to the top 42, extends between side edges 44a and 44b of the skateboard 40, and is generally normal to both the vertical axis and a direction in which the skateboard is configured to roll naturally. A "transverse axis' ^" extends normal to both the vertical and lateral axes, thus extending between ends 46a and 46b of the skateboard 40 and being generally parallel to a direction in which the skateboard is configured to roll naturally.

|0055J In the illustrated embodiment, the second interlock structures 60a and 60b are situated in a generally lateral direction. They are positioned to be substantially perpendicular to the edges 44a and 44b. Such positioning enables a lateral force applied to the second interlock structure 60a or 60b to easily change which direction the skateboard 40 is pointed towards. In another embodiment, one or both of the second interlock structures 60a and 60b may be angled with respect to the edges 44a and/or 44b. Such embodiment may be useful when the edges 44a and 44b are not parallel, such as when the edges 44a and 44b are rounded or taper towards the end 46a or 46b. This embodiment may also be useful when the user wishes to have the second interlock structures 60a and 60b positioned differently, such as to conform to a stance of the user when riding the skateboard 40. For example, the user may prefer to angle the toes of one foot away from the toes of the other foot when riding, and thus may prefer to position the second interlock structures 60a and 60b accordingly.

[0056] In the illustrated embodiment, the second interlock structures 60a and 60b extend upward from the top 42 of the skateboard 40 in a generally vertical direction. Situating the second interlock structures 60a and 60b in this way enables a vertical force applied to the second interlock structure 60a or 60b to easily lift or lower the skateboard 40. In another embodiment, one or both of the second interlock structures 60a and 60b may be angled with respect to the top 42. Such embodiment may accommodate varying shapes of the first interlock structures 50a and 50b or varying attachment of first interlock structures 50a and 50b to the shoes 30a and 30b, respectively. In addition, the second interlock structures 60a and 60b may be angled according to a skill level of the user of the system 10: more skilled users may desire a more vertical arrangement of the second interlock structures 60a and 60b, while a less skilled user may desire that the second interlock structures 60a and 60b be angled such that the second interlock structures 60a and 60b will largely overlap the first interlock structures 50a and 50b. Thus, the interlock structures 60a and 60b may be configured in a variety of positions extending upward from the top 42.

[0057] In the illustrated embodiment, the skateboard 40 and the second interlock structures 60a and 60b are configured to be symmetric about a center line 49. Using this configuration, the user may be able to the system 10 regardless of which direction the user is facing. In other embodiments, the skateboard 40 may not be symmetric. For example, the second interlock structures 60a and 60b may be embodied as different shapes, as opposed to similar shapes as illustrated in Figure 4. The second interlock structures 60a and 60b may also be similar shapes, but situated in different directions. Depending on the configuration of the first interlock structures 50a and/or 50b attached to the shoes 30a and/or 30b, the first interlock structures 50a and 50b may only be able to interact with the second interlock structures 60a and 60b when the user is practicing a particular stance or facing a particular direction. Differing configurations may result in the board being "directional," i.e. configured to roll in a predetermined direction.

[0058] In the illustrated embodiment, the second interlock structure 60a is positioned to engage the first interlock structure 50a when the first interlock structure 50a is shifted towards the end 46a of the skateboard 40, as described in Figure I B. Similarly, the second interlock structure 60b is positioned to engage the first interlock structure 50b when the first interlock structure 50b is shifted towards the end 46b of the skateboard 40, also as described in Figure IB. In other embodiments, either or both of the second interlock structures 60a and 60b may be positioned to engage the first interlock structures 50a and 50b. respectively, when the first interlock structures 50a and 50b are shifted towards the center line 49, such as illustrated in Figure 2B.

|0059] The second interlock structures 60a and 60b may be permanently attached to the skateboard 40 or releasably attached to the skateboard 40. The second interlock structures 60a and 60b may be attached by using an adhesive, by forming the second interlock structures 60a and 60b integral to the skateboard 40. or by using a hook and loop attachment, all of which are described above in relation to attaching the first interlock structure 50b to the shoe 50b. The second interlock structures 60a and 60b may also be attached using means such as threaded or self-locking fasteners, for example screws. whereby it may be possible to adjust the positioning of the second interlock structures 60a and 60b on the skateboard 40 by removing and relocating the fasteners.

[0060] Although the illustrated embodiment is a skateboard 40 having four wheels (wheels 48a and 48b, and two wheels that aren ^' t shown) arranged in a square or rectangular pattern and attached to a bottom of the skateboard 40 (not shown), the system 10 may be implemented using other configurations or types of boards. For example, the skateboard 40 may have more or less than four wheels, and the wheels may be arranged in a pattern different than a square or rectangle. Also, other types of board may be used, such as snowboards or wakeboards, which do not have any wheels

[0061] Embodiments of an interlock structure of Figure IA will now be described. The following descriptions of an interlock structure may apply to any one of interlock structures 50a, 50b, 60a, and 60b. The interlock structure may comprise a variety of materials. In one embodiment, the interlock structure is a resilient material. An interlock structure comprising a resilient material may flex when pressure is placed on the interlock structure, which decreases the likelihood that a user will be injured by falling on the interlock structure. Such resilient material may comprise a polymer, such as rubber or polyurethane, and may be a solid, porous, or foam material. Materials such as polymers may produce a large amount of friction when pushed together; thus, a user pushing two interlock structures made of polymers together may experience increased control of the system 10.

[0062] Figure 5 is a perspective view of a first embodiment of an interlock structure 70 of Figure I A. The interlock structure 70 is comprised of pointed shapes 72a, 72b, and 72c. The pointed shapes 72a, 72b, and 72c are illustrated as being arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. Although three rows of the pointed shapes 72a, 72b. and 72c are illustrated, the interiock structure 70 may comprise additional pointed shapes and rows of pointed shapes. The pointed shapes 72a, 72b, and 72c may be disposed on one or more sides of the interlock structure 70 In the illustrated embodiment, the pointed shapes 72a, 72b, and 72c are protrusions that are substantially triangular and extend laterally across the interlock structure 70. In another embodiment, the pointed shapes 72a. 72b. and 72c may be arranged in a series of columns and may extend vertically across the interlock structure 70

[0063] As can be seen in a side view of the interlock structure 70. illustrated in Figure 6. each of the pointed shapes 72a, 72b, and 72c comprises an upper surface 74a, 74b, and 74c, respectively. The upper surfaces 74a, 74b, and 74c are configured such that when the interlock structure 70 is raised, the upper surfaces 74a. 74b. and 74c can apply a substantially vertical force Thus, any structure that overlaps one of the upper surfaces 74a, 74b. and 74c will be pushed upward when the interlock structure 70 is raised.

[0064] In the illustrated embodiment, each of the pointed shapes 72a, 72b. and 72c also comprises a lower surface 76a, 76b, and 76c, respectively. The lower surfaces are shown as being substantially linear, but the lower surfaces may also be of a curved, rounded, or wavy shape.

[0065] Figure 7 is a perspective view of the interlock structure 70, illustrated in Figure 5, pressed against an embodiment of an interlock structure 370 that is complementary to the interlock structure 70. The interlock structure 170 will be described in more detail below.

[0066] Movement of either the interlock structure 70 or the interlock structure 170 may cause the other interlock structure to move when the interlock structures 70 and 170 are pressed against each as illustrated. When the interlock structure 70 is raised, the upper surfaces 74b and 74c can apply a force to lower surfaces 176a and 176b, respectively, of the pointed shapes 172a and 172b of the interlock structure 170. Thus, when the interlock structure 70 is raised, the interlock structure 170 will also be raised. Conversely, when the interlock structure 170 is lowered, the lower surfaces 176a and 176b will apply a force on the upper surfaces 74b and 74c, respectively, and the interlock structure 70 will also be lowered. If there is sufficient friction between the interlock structures, then lateral movement of either interlock structure 70 or 170 may cause the other interlock structure to move laterally as well.

|0067) As can be seen in Figure 8, the interlock structure 70 and the interlock structure 170 can be pressed together, or register, in positions other than that illustrated in Figure 7. In the position illustrated in Figure S, the upper surface 74c may apply a force to the lower surface 176a or the lower surface 176a may apply a force to the upper surface 74c. Alternatively, the upper surfaces 74a and 74b can contact the lower surfaces 176a and 176b, respectively, and force can be applied between them. The upper surface 74a may also be in contact with the lower surface 176b and force can be applied them. Additional positions are possible in the case where the interlock structure 70 or 170 comprises additional pointed shapes. Also, the interlock structure 70 and/or the interlock structure 170 may be laterally positioned, or registered, in any number of ways.

[0068] Figure 9 is a perspective view of a second embodiment of an interlock structure 90 of Figure I A. The interlock structure 90 is comprised of pointed shapes 92a through 921. The pointed shapes 92a through 92j are illustrated as being arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. Although three rows of the pointed shapes 92a through 921 are illustrated, the interlock structure 90 may comprise additional pointed shapes and rows of pointed shapes. Each row comprises a plurality of pointed shapes. Although the rows of the pointed shapes 92a through 921 are illustrated as comprising three or four pointed shapes, the rows may comprise fewer or additional pointed shapes. The pointed shapes 92a through 921 may be disposed on one or more sides of the interlock structure 90. In the illustrated embodiment, the pointed shapes 92a through 921 are protrusions that are substantially pyramidal.

|0069J As can be seen in a side view of the interlock structure 90, illustrated in Figure 10, each of the pointed shapes 92a, 92b, and 92c comprises an upper surface 94a, 94b, and 94c, respectively; a lower surface 96a, 96b, and 96c. respectively; a first side surface 98a, 98b. and 98c, respectively; and a second side surface (not show in this view). The upper surfaces 94a, 94b, and 94c, and the lower surfaces 96a, 96b, and 96c, are configured such that when the interlock structure 90 is raised or lowered, either the upper surfaces 94a, 94b, and 94c, or the lower surfaces 96a, 96b, and 96c, can apply a substantially vertical force. Thus, any structure that overlaps one of the upper surfaces 94a, 94b, and 94c will be pushed upward or downward when the interlock structure 90 is raised or lowered. Similarly, the first side surfaces 98a, 98b, and 98c, and the second side surfaces, are configured such that when the interlock structure 90 is moved laterally, the first side surfaces 98a, 98b, and 98c, and the second side surfaces, can apply a substantially lateral force. The pointed shapes 92d through 921 have similar features, but are not visible in this view.

|0070] As can be seen in a front view of the interlock structure 90. illustrated in Figure 3 1 , the pointed shapes 92a through 921 of the illustrated embodiment are arranged in a series of three lateral rows, but the pointed shapes 92a through 921 are not arranged in columns. The pointed shapes 92b, 92e, 92h, and 92k are laterally offset from the other pointed shapes 92a, 92c, 92d, 92f, 92g, 92i, 92j, and 921. Thus, a repeating pattern of pointed shapes is formed.

[0071] In the illustrated embodiment, the apexes of the pointed shapes 92e, 92h, and 92k are approximately vertically aligned with a space where the other pointed shapes 92a, 92c, 92d, 92f, 92g, 92L 92j, and 921 laterally meet. In other embodiments, the pointed shapes 92e, 92h, and 92k may be offset so that the apexes of the pointed shapes 92e, 92h, and 92k are not vertically aligned with a space where the other pointed shapes 92a, 92c, 92d, 92f, 92g, 92i, 92j, and 921 laterally meet. In one such embodiment, the pointed shapes 92a through 921 are arranged in vertical columns, such that the pointed shapes 92b, 92e, 92h, and 92k are not offset from the other pointed shapes 92a, 92c, 92d _? 92f, 92g, 92i, 92j, and 921. In another embodiment, the pointed shapes are92a through 92j are arranged in columns, with some of the pointed shapes being vertically offset.

|0072] Figure 12 is a perspective view of the interlock structure 90 pressed together with a similar interlock structure 120. In this context, "similar" connotes that the interlock structure 120 comprises pointed shapes arranged in a series of lateral rows, wherein each row comprises a plurality of the pointed shapes. In the illustrated embodiment, the interlock structure 120 is substantially identical to the interlock structure 90. The use of substantially identical interlock structures may reduce manufacturing costs and concerns, and may allow the user greater flexibility when using or configuring the system 10. In another embodiment, the interlock structure 120 may comprise more or less pointed shapes, or more or less rows. Additionally, the pointed shapes may be positioned in a number of configurations, as described above, and may be configured to interact with a predetermined pattern of pointed shapes on the interlock structure 90. Those of skill in the art will understand the ways in which the pointed shapes may be positioned.

[0073] When the interlock structure 90 is pressed together, or registered, with the similar interlock structure 120 that is substantially identical to the interlock structure 90, as illustrated in Figure 12, an offset of the pointed shapes 92b, 92e, 92h, and 92k ensures that at least one of the pointed shapes 92b, 92e, 92h, and 92k will be simultaneously located above, below and laterally between pointed shapes of the interlock structure 120. Thus, movement of the interlock structure 90 in any vertical or lateral direction will cause an upper surface, a lower surface, a first side surface, and/or a second side surface of the at least one pointed shape to contact a surface of a pointed shape of the interlocks structure 120. In this way. the interlock structure 90 can exert a force on the interlock structure 120 and movement of the interlock structure 90 in any vertical or lateral direction will cause corresponding movement of the interlock structure 120. Similarly, movement of the interlock structure 120 in a vertical or lateral direction will cause corresponding movement of the interlock structure 90.

[0074] Configuring the pointed shapes 92e, 92h, and 92k such that the apexes of the pointed shapes 92e, 92h, and 92k are vertically aligned with a space where the other pointed shapes 92a, 92c, 92d, 92 f, 92g, 92i. 92j, and 921 laterally meet allows pointed shapes of the interlocks structures 90 and 120 that contact each other to contact each other along a maximum surface area. This increases the security of the connection between the interlocks structures 90 and 120.

[0075] When the pointed shapes 92a through 921 are vertically aligned in columns and the interlock structure 90 is pressed together, or registered, with the interlock structure 320, at least one of the pointed shapes 92a through 921 will be located above and below pointed shapes of the interlock structure 120, or the at least one pointed shape will be located laterally between pointed shapes of the interlock structure 120. The at least one pointed shape, however, will not be simultaneously located above, below and laterally between pointed shapes of the interlock structure 120. Therefore, when the pointed shapes 92a through 921 are vertically aligned in columns, only one of a vertical movement or a lateral movement of the interlock structure 90 will cause corresponding movement of the interlock structure 120. Similarly, only one of a vertical movement or a lateral movement of the interlock structure 120 will cause corresponding movement of the interlock structure 90.

[0076] As can be seen in Figure 13, the interlock structure 90 and the interlock structure 120 can be pressed together, or register, in positions other than that illustrated in Figure 12. The interlock structure 90 and the interlock structure 120 may be pressed together, or registered, in a plurality of vertical positions, similar to the plurality of vertical positions in which the interlock structure 70 and the interlock structure 170 of the first embodiment may be pressed together, described in reference to Figure 8. The interlock structure 90 and the interlock structure 120 may also be pressed together, or registered in a plurality of lateral positions. While the interlock structure 70 and the interlock structure 170 may be pressed together in any number of lateral positions, the interlock structure 90 and the interlock structure 120 may only be laterally pressed together in registry in a discrete number of positions, as defined by the number of pointed shapes comprising each row of the interlock structure 90 and/or the interlock structure 120.

|0077] Figure 14 is a perspective view of a third embodiment of an interlock structure 140 of Figure 1 . The interlock structure 140 is comprised of rounded shapes 142a through 142f. The rounded shapes 142a through 142 f are illustrated as being arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. Although two sets of three rows of the rounded shapes 142a through 142f are illustrated, the interlock structure 140 may comprise additional rounded shapes, rows of rounded shapes, and/or sets of rounded shapes.

[0078] In the illustrated embodiment, the rounded shapes 142a, 142b, and 342c are located on a side of the interlock structure 140 opposing a side on which the rounded shapes 142d, 142e, and 142f are located. By locating the rounded shapes 142a through 342f in this way, a similar interlock structure can register with a plurality of sides of the interlock structure 140. In other embodiments, the rounded shapes 142a. 142b, and 142c may be located on a side of the interlock structure 140 other than, or in addition to, a side that opposes the side on which the interlock structures 142d, 142e, and 142f are located. Similarly, the interlock structures 70 and 90, illustrated in Figures 5 and 9. respectively, may have protrusions disposed on a plurality of sides.

|0079] The rounded shapes 142a through 142f are configured such that when the interlock structure 140 is raised or lowered, the rounded shapes 142a through J 42f can apply a substantially vertical force. In the illustrated embodiment, the rounded shapes 142a through 142f extend laterally across the interlock structure 140. In another embodiment, the rounded shapes 142a through 142f may be arranged in a series of columns and may extend vertically across the interlock structure 140. In this embodiment, the rounded shapes 142a through 142f may be configured to apply a substantially lateral force when the interlock structure 140 is shifted laterally.

[0080] In the illustrated embodiment, the rounded shapes 142a through 142f are protrusions that are substantially semicircular. In another embodiment, the rounded shapes 142a through 142f may be more or less oblong. In yet another embodiment, the interlock structure 140 may comprise protrusions of differing shapes. For example, the rounded shapes 142a, 142b, and 142c may be substantially semicircular, while the rounded shapes 142d, 142e, and 142f may be more oblong. For further example, the interlock structure 140 may comprise the rounded shapes 142a, 142b, and 142c disposed on one side, and may further comprise pointed protrusions, such as illustrated in Figures 5and 9, disposed on another side. The pointed protrusions may be implemented in place of the rounded structures 142d, ] 42e, and 142f. Similarly, the interlock structures 70 and 90, illustrated in Figures 5 and 9 _: respectively, may have protrusions of differing shapes. [0081] The interlock structure 140 may be pressed against, or registered with, a similar interlock structure in a plurality of vertical positions. In this context, a "similar interlock structure ^" connotes an interlock structure comprising rounded shapes arranged in a series of lateral rows. When the interlock structure 140 is pressed against the similar interlock structure, movement of the interlock structure 140 in a vertical direction will cause movement of the similar interlock structure in a vertical direction. Similarly, movement of the similar interlock structure in a vertical direction will cause movement of the interlock structure 140 in a vertical direction. This interaction of the interlock structure 140 and the similar interlock structure is similar to the interaction of the interlock structure 70 and the interlock structure 170, described in reference to Figures 7 and 8.

[0082] Figure 15 is a perspective view of a fourth embodiment of an interlock structure ] 50 of Figure 1 A. The interlock structure 150 is comprised of rounded shapes 152a through 152J- The rounded shapes 152a through 152j are illustrated as being arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. Each row comprises a plurality of rounded shapes. Although the rows of the rounded shapes 152a through 1521 are illustrated as comprising three or four rounded shapes, the rows may comprise fewer or additional rounded shapes. Additionally, although three rows of the rounded shapes 152a through 1521 are illustrated, the interlock structure 150 may comprise additional rounded shapes and rows of rounded shapes. The rounded shapes 152a through 1521 may be disposed on one or more sides of the interlock structure 150, as described above with reference to the interlock structure 140, illustrated in Figure 14.

[0083] The rounded shapes 152a through 1521 are configured such that that when the interlock structure 150 is moved in any vertical or lateral direction, the rounded shapes 352a through 1521 can apply a vertical or lateral force. In the illustrated embodiment, the rounded shapes 152a through 1521 are protrusions that are substantially hemispherical. In another embodiment, the rounded shapes 152a through 1521 may be more or less oblong. In yet another embodiment, the interlock structure 150 may comprise protrusions of differing shapes.

[0084] The rounded shapes 152a through 1521 may be arranged in a number of ways. For example, the rounded shapes 152b, 152e, 152h, and 152k may be arranged laterally offset from the other rounded shapes 352a _: 152c, 152d, 152f, 152g, 152i, 152j, and 1521. In the illustrated embodiment, the rounded shapes 152e, 152h, and 152k are vertically aligned with a lateral space between the other rounded shapes 152a, 152c, 152d, 152f, 152g, 152i, 152j, and 1521. In addition, the rounded shapes 152a through 1521 may be arranged in configurations similar to those configurations described in reference to the pointed shapes 92a through 921 of the interlock structure 90, as described in reference to Figure 9.

[0085] The interlock structure 150 may be pressed against, or registered with, a similar interlock structure 360 in a plurality of vertical or lateral positions. In this context, a "similar interlock structure ^" connotes an interlock structure comprising rounded shapes arranged in a series of lateral rows, wherein each row comprises a plurality of rounded shapes. When the interlock structure 150 is pressed against the similar interlock structure 160, movement of the interlock structure 150 in a vertical and/or lateral direction will cause movement of the similar interlock structure 160 in a vertical and/or lateral direction, respectively. Similarly, movement of the similar interlock structure 160 in a vertical and/or lateral direction will cause movement of the interlock structure 150 in a vertical and/or lateral direction, respectively. This interaction of the interlock structure 150 and the similar interlock structure 160, and plurality of positions in which the interlock structure 150 and the similar interlock structure 160 may be pressed together or register, is similar to the interaction of the interlock structure 90 and the similar interlock structure 120 and the plurality of positions in which the interlock structure 90 and the similar interlock structure 120 may be pressed together, described in reference to Figures 12 and 13.

[0086] Embodiments of interlock structures complementary to the first through fourth embodiments of an interlock structure, illustrated in Figures 5, 9, 14, and 15, will now be described. In this context, a first interlock structure that is "complementary ^" to a second interlock structure connotes that at least a portion of the first interlock structure or the second interlock structure is an inverse of at least a portion of the other structure. Thus, if the second interlock structure comprises protrusions, at least a portion of the first interlock structure will comprise recesses that mirror the shape of the protrusions. Hence, when the first and second interlock structures are placed together, all surfaces of the protrusions will contact a surface of the second interlock structure. [0087] Figure 17 is a perspective view of an embodiment of an interlock structure 170 that is complementary to the first embodiment of an interlock structure 70, illustrated in Figure 5. The interlock structure 170 is comprised of pointed shapes 172a, 172b, and 172c arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. The interlock structure 170 may comprise more rows or pointed shapes than illustrated, and the pointed shapes 172a, 172b, and 172c may be disposed on one or more sides of the interlock structure 170, similar to the configuration of the interlock structure 70. The interlock structure 170 may comprise protrusions of differing shapes.

[0088] Each of the pointed shapes 172a, 172b, and 172c comprises an upper surface 174a, 174b, and 174c, respectively. Each of the pointed shapes 172a. 172b, and 172c also comprises a lower surface 176a, 176b, and 176c, respectively, configured such that when the interlock structure 170 is lowered, the lower surfaces 176a. 176b. and 176c can apply a substantially vertical force. As illustrated in Figure 7, the interlock structure 170 may be pressed against the interlock structure 70 such that the upper surface 174b and lower surface 176b of the pointed shape 172b will be in complete contact (i.e. not separated by a substantial amount of space) with the lower surface 76b of pointed shape 72b and the upper surface 74c of the pointed shape 72c of the interlock structure 70. Other portions of the interlock structure 170 may also be in complete contact with the interlock structure 70 when pressed together in this position or in another position. Thus, at least a portion of the interlock structure 170 is an inverse of at least a portion of the interlock structure 70.

|0089] Figure 18 is a perspective view of an embodiment of an interlock structure 180 that is complementary to the second embodiment of an interlock structure 90, illustrated in Figure 9. The interlock structure 180 is comprised of recesses 182a through 1821 arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. The interlock structure 180 may comprise more rows of recess and the recesses 182a through 1821 may be disposed on one or more sides of the interlock structure 180, similar to the configuration of the pointed shapes 92a through 921 of the interlock structure 90. In the illustrated embodiment, the recesses 182a through 1821 are shaped such that a pyramidal shape may be placed inside them. In another embodiment, the interlock structure 180 may comprise recesses of differing shapes, or may comprise a combination of recesses and protrusions. Similarly, the interlock structures 70, 90. 140, 150, and 170 may also comprise a combination of recesses and protrusions. In one embodiment, the interlock structure 180 comprises protrusions on one side and recesses on an opposing side.

[0090] In the illustrated embodiment, the recesses 182a through 1823 are arranged in a series of three lateral rows, but the recesses 182a through 1821 are not arranged in columns. The recesses 182b, 182e, 182h, and 182k are offset from the other recesses 182a, 182c, 182d, 182f, 182g, 182i, 182j, and 1821. Thus, a repeating pattern of recesses is formed.

(0091] The interlock structure 180 may be pressed against, or registered with, the interlock structure 90 in a plurality of positions. Those skilled in the art will appreciate that the recesses 182a through 1821 of the interlock structure 180 may accept some or all of the pointed shapes 92a through 921 of the interlock structure 90. Thus, when the interlock structure 180 and the interlock structure 90 are pressed together or registered, a plurality of the pointed shapes 92a through 921 will be in complete contact with the surfaces of a plurality of the recesses 182a through 1821. Hence, at least a portion of the interlock structure 180 is an inverse of at least a portion of the interlock structure 90.

[0092] Figure 19 is a perspective view of an embodiment of an interlock structure 190 that is complementary to the third embodiment of an interlock structure 140, illustrated in Figure 14. The interlock structure 190 is comprised of recesses 192a, 192b, and 192c arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. The interlock structure 190 may comprise more rows of recess and the recesses may be 192a, 192b, and 192c may be disposed on one or more sides of the interlock structure 190, similar to the configuration of the rounded shapes 142a, 142b, and 142c of the interlock structure 140. In the illustrated embodiment, the recesses 192a, 192b, and 192c are shaped such that a semicircular shape may be placed inside them. In another embodiment, the interlock structure 190 may comprise recesses of differing shapes, or may comprise a combination of recesses and protrusions.

[0093] The interlock structure 190 may be pressed against, or registered with, the interlock structure 140 in a plurality of positions. Those skilled in the art will appreciate that the recesses 192a, 192b, and/or 192c of the interlock structure 190 may accept some or all of the rounded shapes 142a, 142b, and/or 142c of the interlock structure 140. Thus, when the interlock structure 190 and the interlock structure 140 are pressed together or registered, at least one of the rounded shapes 142a, 142b, and/or 142c will be in complete contact with at least one of the recesses 192a, 192b, or 192c. Hence, at least a portion of the interlock structure 190 is an inverse of at least a portion of the interlock structure 140.

[0094] Figure 20 is a perspective view of an embodiment of an interlock structure 200 that is complementary to the fourth embodiment of an interlock structure 150, illustrated in Figure 15. The interlock structure 200 is comprised of recesses 202a through 2021 arranged in a series of rows. The rows are illustrated as being substantially lateral, but may be angled from a lateral direction. The interlock structure 200 may comprise more rows of recesses and the recesses 202a through 2021 may be disposed on one or more sides of the interlock structure 200, similar to the configuration of the rounded shapes 152a through 1521 of the interlock structure 150. In the illustrated embodiment, the recesses 202a through 2021 are shaped such that a hemispherical shape may be placed inside them. In another embodiment, the interlock structure 200 may comprise recesses of differing shapes, or may comprise a combination of recesses and protrusions.

|0095] In the illustrated embodiment, the recesses 202a through 2021 are arranged in a series of three lateral rows, but the recesses 202a through 2021 are not arranged in columns. The recesses 202b. 202e, 202h, and 202k are offset from the other recesses 202a, 202c, 202d, 202f, 202g, 202i, 202j, and 2021. Thus, a repeating pattern of recesses is formed.

10096] The interlock structure 200 may be pressed against, or registered with, the interlock structure 150 in a plurality of positions. Those skilled in the art will appreciate that the recesses 202a through 2021 of the interlock structure 200 may accept some or all of the rounded shapes 152a through 1521 of the interlock structure 150. Thus, when the interlock structure 200 and the interlock structure 150 are pressed together or registered, a plurality of the rounded shapes 152a through 1521 will be in complete contact with the surfaces of a plurality of the recesses 202a through 2021. Hence, at least a portion of the interlock structure 200 is an inverse of at least a portion of the interlock structure 150. [0097] Those of skill in the art will appreciate that the system for attaching a shoe to a skateboard described above can arrest lateral and/or vertical movement of the shoe in relation to the skateboard. In addition, those of skill in the art will also appreciate that the interlocking structures of the system can be configured to allow a user wearing the shoe to move freely when the interlock structures are not engaged, while still providing the attachment of the shoe to the skateboard when necessary. To add to this, the interlocking structures may be pressed together in a plurality of vertical and/or lateral positions, providing adjustable and selectable attachment of the shoe to the skateboard.

[0098] Those of skill in the art will recognize that differing embodiments of the interlock structures may be pressed together to inhibit lateral and/or vertical movement of a shoe in relation to a skateboard. For example, the interlock structure 70 may be configured such that it may be pressed together with the interlock structure 90and/or the interlock structure 150. Also, the interlock structure 90 may be configured such that it may be pressed together with the interlock structure 170. In addition, the interlock structure 150 may be configured such that it may be pressed together with the interlock structure 140 and/or the interlock structure 190. Those of skill in the art will recognize that the illustrated embodiments of interlock structures may be pressed together, and thus engage or register, in ways other than those described to inhibit lateral and/or vertical movement of a shoe in relation to a skateboard, and those of skill in the art will recognize that other interlock structures may be pressed against the illustrated interlock structures to inhibit lateral and/or vertical movement of a shoe in relation to a skateboard.

[0099] Those of ski]] in the art will also recognize that the interlock structures may be configured to movement other than that described above. For example, where any interlock structure is configured to inhibit vertical movement with protrusions arranged in a series of rows, the interlock structure may also be configured to inhibit lateral movement by arranging the protrusions in a series of columns. In addition, the rows or columns can be angled with respect to a vertical and/or lateral direction to inhibit movement in a direction other than vertical or lateral.

[0100] While the above detailed description has shown, described, and pointed out novel features as applied to various aspects, it will be understood that various omissions, substitutions, and changes in the form and details of the system and structures illustrated may be made by those skilled in the art without departing from the scope of this disclosure. Although the description uses the term "skateboard" in many places, it will be understood that the system described herein can instead be used in any application in which it is desired to transiently attach a user's foot to a platform, so it is contemplated to substitute the word "platform" for the word "skateboard" throughout the foregoing. As will be recognized, the aspects and variations of the aspects may be embodied within a form that does not provide all of the features and benefits set forth herein, as some features may be used or practiced separately from others. The scope of this disclosure is defined by the appended claims, the foregoing description, or both. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.