WO2019203290A1

WO2019203290A1 - Sole for sports artificial foot

Info

Publication number: WO2019203290A1
Application number: PCT/JP2019/016549
Authority: WO
Inventors: 大太糸井; 耕平佐橋
Original assignee: 株式会社ブリヂストン
Priority date: 2018-04-17
Filing date: 2019-04-17
Publication date: 2019-10-24
Also published as: JPWO2019203290A1

Abstract

This sole, for a sports artificial foot that has a leaf-spring shaped foot part extending toward the toe side, is mounted, via at least one bent part, to a ground-contact region extending in an arc shape from the toe to the bent part side. The sole has a bottom surface having a shape conforming to the extension shape of the ground-contact region. The bottom surface has land parts demarked by a plurality of grooves. The grooves consist of width-direction grooves which extend in the width direction of the foot part.

Description

Prosthetic sole for competition

The present invention relates to a sole that is attached to a contact area of a prosthetic leg for competition, and more particularly to a sole for a prosthetic leg that suppresses slippage of the prosthetic leg during competition.

Conventionally, a prosthetic leg for competition (hereinafter also referred to as a prosthetic leg for competition or simply a prosthetic leg) has a leaf spring-like leg part extending to the toe side through the curved part, and the contact area extends in an arc shape from the toe to the curved part side. Is known). Generally, such a prosthetic leg having a leaf spring-like foot portion is provided with a sole that contacts the road surface on the bottom surface of the contact area.

For example, Patent Document 1 exemplifies a sole that is attached to the lower surface of a curved plate spring-like prosthetic leg for competition, such as jogging or running. That is, Patent Document 1 describes a sole in which spikes are attached to the lower surface of a sole that contacts the road surface, and a sole in which a number of outsole portions each having a hexagonal ground surface are provided.

JP 2016-150189 A

However, in the sole exemplified in Patent Document 1, no consideration is given to suppressing slipping of the artificial leg, that is, anti-slip property. For example, when playing a game during rain, etc., it will run on a wet road. At this time, if a water film is present on the road surface, a water film is interposed between the bottom surface of the sole and the road surface, and as a result, the ground contact of the bottom surface of the sole is prevented, thereby causing slip. In particular, on a road surface with a low coefficient of friction μ such as asphalt or stone pavement, a wearer of a prosthetic foot may hesitate to further accelerate. Therefore, in order for a wearer of a prosthetic leg to fully demonstrate the running skill as a competitor, a sole having high anti-slip performance is required.

Therefore, an object of the present invention is to provide a sole for a prosthetic leg having a high anti-slip performance.

The inventor earnestly investigated the means for solving the above-mentioned problems. That is, when the bottom surface of the sole of the prosthetic leg for competition is examined in detail, a groove is provided on the bottom surface to give an edge component due to unevenness, and a grip force on the road surface is secured through the edge component. It has been conceived that slipping can be prevented. Furthermore, the groove for imparting the edge component is higher than the arrangement of the orientation in various orientations, by unifying the orientation to extend in the width direction of the prosthetic foot, resulting in an increased edge effect and high gripping force. The inventors have found that anti-slip performance can be realized and have completed the present invention.

The sole of the prosthetic leg for competition of the present invention is a contact of the prosthetic leg having a leaf spring shape extending toward the toe side through at least one curved part and extending in an arc shape from the toe to the curved part side. A sole to be attached to an area, the sole having a bottom surface shaped according to an extending shape of the contact area, the bottom surface having a land portion defined by a plurality of grooves, the grooves being the legs; It consists only of the width direction groove | channel extended in the width direction of a part.

According to the present invention, it is possible to provide a sole for a prosthetic leg having a high anti-slip performance. By wearing this sole on the prosthetic leg for competition, there is an effect that the athlete's skill is exhibited.

It is a side view of the artificial leg for competition with which the sole concerning a 1st embodiment of the present invention was equipped. It is a figure which shows the pattern of the sole bottom face of the sole of the artificial leg for competitions concerning 1st Embodiment. It is a figure which shows one shape of the width direction land part of FIG. It is a figure for explaining the operation | movement of a foot | leg part and a grounding form in steps when the artificial leg for competition is worn and the wearer goes straight ahead. It is a figure for explaining the operation | movement of a foot | leg part and a grounding form in steps when the artificial leg for competition is worn and the wearer goes straight ahead. It is a figure for explaining the operation | movement of a foot | leg part and a grounding form in steps when the artificial leg for competition is worn and the wearer goes straight ahead. It is a figure for explaining the operation | movement of a foot | leg part and a grounding form in steps when the artificial leg for competition is worn and the wearer goes straight ahead. It is a figure which shows the pattern of the sole bottom face of the sole of the artificial leg for competitions concerning 2nd Embodiment. It is a figure which shows one shape of the width direction land part of FIG. It is a figure which shows the pattern of the sole bottom face of the sole of the game artificial leg which concerns on a comparative example.

Hereinafter, the sole of the prosthetic leg of the present invention (hereinafter also referred to as a sole) of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a prosthetic leg 1 for competition equipped with a sole 5 according to the first embodiment of the present invention. The prosthetic leg 1 for competition has a leaf spring-like leg 2 and a sole 5 is attached to a contact area on the tip side. In addition, although illustration is abbreviate | omitted, the base end part of the foot part 2 is connected to a socket via an adapter, and a wearer wears a prosthetic leg by accommodating the stump of a wearer's leg in a socket. be able to. As the adapter and the socket, those corresponding to the stump position of the foot such as a thigh prosthesis and a crus prosthesis are used. FIG. 1 shows the foot 2 and the sole 5 in an upright state of a wearer who wears the prosthetic leg 1 for competition.

Hereinafter, in this embodiment, in the height direction of the prosthetic leg for competition, the side where the foot 2 is connected to the adapter is referred to as the connection side, and the side where the foot 2 contacts the road surface S is referred to as the ground side. Further, the toe T of the prosthetic leg 1 for competition refers to the foremost point where the foot 2 extends from the connection side and terminates. Further, a direction extending from the toe T in parallel to the road surface S is referred to as a foot front-rear direction Y. Furthermore, the direction over the width direction of the foot 2 is referred to as the width direction W.

In this embodiment, the foot portion 2 of the prosthetic leg 1 for competition has a shape extending in a plate shape toward the toe T via at least one curved portion, in the illustrated example, 1 curved portion 3. In FIG. 1, the foot part 2 includes, in order from the connection side to the ground side, a straight part 2 a, a curved part 2 b that is convex toward the toe T side, a curved part 3 that is convex toward the rear side in the foot front-rear direction Y, The curved portion 2c and the grounding portion 4 extending to the toe T side in an arc shape protruding to the grounding side.

Although the material of the foot 2 is not limited, it is preferable to use carbon fiber reinforced plastic or the like from the viewpoint of strength and weight reduction.

The grounding portion 4 has, on the grounding side, a contact area 4s extending in an arc shape from the toe T toward the bending portion 3, and a sole 5 is attached to the contact area 4s. The contact area 4s refers to the entire area that comes into contact with the road surface S when the wearer who wears the prosthetic leg 1 performs a straight traveling operation. In the state where the sole 5 is attached, the contact area 4s is the sole 5 It contacts with the road surface S via.

The sole 5 has a shape according to the extended shape of the contact area 4s. The grounding side of the sole 5 is a bottom surface 5s. As shown in FIG. 1, the bottom surface 5s has a shape in which the arcs X1 and X2 are continuous from the toe T side to the bending portion 3 side. In the present embodiment, the arc X1 and the arc X2 have different radii of curvature, but may have the same radius of curvature.

Hereinafter, with reference to FIG. 2, a groove shape to be imparted to the bottom surface 5s of the sole of the prosthetic leg for competition according to the first embodiment, a so-called groove pattern will be described.

As shown in FIG. 2, the bottom surface 5 s has a groove pattern composed of only the width direction grooves 20 extending in the width direction W. In this embodiment, the width direction groove | channel 20 is extended along the width direction W, and both ends are opened to the width direction edge of 5 s of bottom faces. Here, the groove pattern consisting only of the widthwise grooves 20 means that no vertical grooves extending along the foot front-rear direction Y and opening at one or both of the front-rear end edges of the bottom surface 5s are provided. . Therefore, it is preferable that the width direction groove 20 extends in the width direction W of the foot, but an inclination of 30 to 55 ° with respect to the width direction W is allowed. Moreover, although it is preferable that the width direction groove | channel 20 opens to the width direction edge of 5 s of bottom faces, you may include what terminates in the bottom face 5s.

According to the above configuration, the edge component by the width direction groove 20 is unified in the direction along the width direction W. That is, when the wearer who wears the prosthetic leg 1 for competition performs a straight running operation, the ground contact portion of the bottom surface 5s with respect to the road surface S changes in the front-rear direction of the foot, so Along the edge function is required. Therefore, by not providing the vertical groove on the bottom surface 5s, the edge can be concentratedly arranged in the width direction W without being dispersed in the direction other than the width direction W, and the edge function along the width direction W can be maximized. did.

Further, a plurality of width direction land portions 10 extending in the foot width direction are partitioned by a plurality of width direction grooves 20 on the bottom surface 5s. In particular, it is preferable from the viewpoint of further increasing the edge component that the width direction land portion 10 is divided and formed similarly by the width direction groove 20 extending in a wave shape in the width direction W. .

As used herein, the term “wave” refers to a sine wave, zigzag, unevenness, or the like that has substantially the same shape that changes phase with substantially the same period, and is preferably a sine wave or a zigzag shape having the same phase. In the present embodiment, as shown in FIG. 3, the land portion extends with a predetermined width along the wavy line P1 having such a wave shape. Thus, by making the width direction land portion 10 corrugated, the edge component in the width direction W can be increased and the edge component in the front-rear direction can also be imparted, and a higher edge effect can be obtained overall. Can do. That is, even if the input direction is deviated from the width direction W when the wearer of the prosthetic leg 1 is running, the edge effect can be sufficiently exhibited.

In addition, as shown in FIGS. 2 and 3, the wavy shape in the width direction land portion 10 means that the toe protrudes from the position of the peak M <b> 1 and the valley V <b> 1 of the wavy line P <b> 1 to one side or the other side in the foot front-rear direction. You may provide the side protrusion part 10b and the curved part side protrusion part 10c. By providing the toe side protruding portion 10b and the curved portion side protruding portion 10c, the edge component can be further increased, and the edge effect in both the foot front-rear direction Y and the width direction W can be enhanced.

Further, the width-direction land portion 10 is line-symmetric with respect to a line segment extending in the foot front-rear direction Y through the wave peak M1 or valley V1 in one wave wavelength (wave peak-to-peak or valley-to-valley). It is preferable. As shown in FIG. 3, the width-direction land portion 10 is axisymmetric with respect to a line segment b1 extending in the foot front-rear direction Y through the mountain M1 of the wave line P1 in one wave wavelength λ1. The minute λ2 is line-symmetric with respect to a line segment b2 that extends in the foot front-rear direction Y through the valley V1. According to the said structure, even if an input direction shifts | deviates from the width direction W at the time of the driving | running | working of the wearer of the artificial leg 1 for competitions, an edge function can be exhibited reliably.

Next, the groove pattern of the bottom surface 50s of the sole of the prosthetic leg for competition according to the second embodiment will be described with reference to FIGS. 4A to 4D, FIG. 5 and FIG. The sole of the prosthetic leg for competition according to the second embodiment has the same basic configuration as that of the first embodiment, and is different from the first embodiment only in the groove pattern of the bottom surface 5s.

The pattern of the bottom surface 50s of the prosthetic leg sole for competition according to the second embodiment is based on the knowledge about the ground contact form obtained by the experiment described later. Therefore, the experimental results of the ground contact configuration of the bottom surface 50s described above will be described below with reference to FIGS. 4A, 4B, 4C, and 4D. 4A, FIG. 4B, FIG. 4C, and FIG. 4D are for explaining step by step the operation of the foot 2 and the ground contact form with the bottom surface 50s when the wearer wearing the competition artificial leg 1 travels straight ahead. FIG. The upper part of each drawing is a side view of the foot 2 and the sole 5, and the lower part of each drawing is the transition of the ground contact form of the bottom surface 50s when the wearer wearing the competition prosthetic leg 1 performs a straight running operation. Is shown.

That is, FIG. 4A shows a state in which the competition artificial leg 1 lifted by the wearer is lowered onto the road surface S and the entire weight is loaded on the competition artificial leg 1. As shown in the lower part of the drawing, when the prosthetic leg 1 is lowered onto the road surface S, the contact area of the bottom surface 50s is in the vicinity of the center of the bottom surface, and is spaced from the curved part 3 and the toe T side in the front-rear direction. It is a free area.

FIG. 4B shows a state in which the wearer steps forward from the state of FIG. 4A while the full weight is loaded on the prosthetic leg 1 for competition. In the case of a healthy person's running, it is common to step on the ground in order from the heel side to the toe side of the shoe sole to be grounded first, but the prosthetic leg for competition 1 is more curved than where it was grounded first. The grounding area has moved to the part 3 side.

FIG. 4C shows a state in which the wearer swings forward the opposite leg to the side on which the athletic prosthetic leg 1 is worn and starts to kick out the athletic prosthetic leg 1. When this kicking-out operation is started, the game prosthetic leg 1 is grounded in a region on the toe T side of the bottom surface 50s from the region shown in FIGS. 4A and 4B.

FIG. 4D shows a state immediately before leaving the road surface S at the final stage where the wearer kicks out the prosthetic leg 1 for competition. In order to kick out from the toe T on the bottom surface 50s, the grounding is performed in a region closer to the toe T than FIG. 4C.

Based on the experimental results shown in FIG. 4A, FIG. 4B, FIG. 4C, and FIG. 4D, the inventor believes that it is advantageous for improving the performance of the prosthetic leg sole that the bottom surface 50s is functionally separated according to the transition of the above-described ground contact region. As a result, the following groove pattern for that purpose was conceived.

That is, in the groove pattern shown in FIG. 5, in the groove pattern shown in FIG. 2, three rows of the width direction land portions 10 described above are left, and the width direction land portions are arranged on the curved portion 3 side of the row of the width direction land portions 10. 11, the width direction land portion 14 and the width direction land portion 12 are sequentially arranged on the toe T side of the row of the width direction land portions 10, respectively. These width

direction land parts

11, 12, and 14 have the shape extended in a wave shape with the same phase as the width direction land part 10 in 1st Embodiment. Accordingly, each of the width

direction land portions

11, 12 and 14 is a land portion extending with a predetermined width along the line segment P1 having a wave shape according to the above-described definition, like the width direction land portion 10. The difference between the width

direction land portions

11, 12 and 14 and the width direction land portion 10 is as described later, and other configurations follow the configuration of the width direction land portion 10 described above.

Here, the area where the width

direction land portions

10, 11 and 14 are arranged corresponds to the ground contact area shown in FIGS. 4A and 4B above, and the wearer first lands, and the total weight is on the prosthetic leg 1 for competition. This is the area where the stepping action is performed in a loaded state. Therefore, it is important that the region is sufficiently gripped with the road surface S so that the balance of the entire body is maintained even if the wearer applies the total weight to the prosthetic leg 1 for competition. Therefore, by arranging the width direction land portion 10 excellent in the edge effect in the width direction W and the width

direction land portions

11 and 14 similar to the width direction land portion 10, a high edge function is given to the region. In addition, a sufficient grip force for the road surface S is ensured, and a high slip resistance performance is given to the area.

In addition, the width direction land portion 11 is wider than the width direction land portion 10. As shown in FIG. 4B, in the state where the vehicle is stepped on immediately after landing, the ground contact area changes to the curved portion 3 side, that is, the direction opposite to the direction in which the wearer proceeds, from the first grounded area. Here, the movement of the upper body that the wearer tries to move forward and the direction of transition of the ground contact area are temporarily reversed, and the second half kick-out operation of the ground contact form shown in FIGS. 4C to 4D This is a stage where high driving force is required. By placing the width direction land portion 11 having a width larger than the width direction land portion 10 on the curved portion 3 side with respect to the width direction land portion 10 and increasing the land portion ratio, the rigidity of the arrangement region is increased and the stepping operation is performed. Realizes high propulsive force for smoothly connecting the kicker to the kicking motion.

Furthermore, the width direction land portion 12 is sequentially arranged on the toe T side of the width direction land portion 14. The region in which the width direction land portion 12 is arranged is a region to be grounded when the kicking-out operation of the game artificial leg 1 shown in FIG. 4C is started. The width direction land portion 12 is a land portion extending in a wave shape like the width direction land portion 10, and in particular, the land portion width which is the width in the normal direction of the wavy line is changed. That is, it has a wave shape in which the land width in the half wavelength of the wave (wave peak to valley or valley to peak) is wide and narrow. Specifically, as shown in FIG. 6, the width-direction land portion 12 has a half-wavelength portion λ3, that is, a land portion width w1 from the valley V2 of the wavy line P2 to the adjacent mountain M2. And the land part width w2 from the mountain M2 to the adjacent valley V2 has a wave shape in which the land part width w1 is relatively wide and the land part width w2 is narrow. Further, for one wavelength λ4 of the wave, ½ wavelength, that is, the land width w2 from the peak M2 of the wave line P2 to the adjacent valley V2, and the land width w1 from the valley V2 to the adjacent mountain M2 However, the relationship where w1 is relatively wide and w2 is narrow is repeated. By making the land portion width w1 on one side larger than the land portion width w2 on the other side, the rigidity of the land portion can be increased and the wear resistance performance can be improved. In other words, the ease of slipping caused by increasing the land portion width can be avoided by making the land portion width w2 on the other side smaller than that on the one side. By combining the above and appropriately setting the land widths w1 and w2, it is possible to achieve both drainage performance and wear resistance performance at a high level. From such a viewpoint, the ratio w1 / w2 of the land widths w1 and w2 is preferably 2.0 to 15. More preferably, the land widths w1 and w2 satisfy the following numerical ranges.
2.0mm <w1 <4.0mm
0.3mm <w2 <1.0mm

Moreover, it is preferable that the sole 50s includes the sipe 13 in a region from the edge on the toe T side toward the curved portion 3 side. In the region where the sipe 13 is arranged, as shown in FIG. 4D, the wearer swings forward the foot opposite to the side on which the prosthetic leg 1 is worn, and performs the kick-out operation of the prosthetic leg 1 for competition. It is an area. This region is a region where wear is particularly likely to proceed because the grounding is made in order toward the toe T and the wearer touches and slides the road surface S on the bottom surface 50s. Therefore, in this region, it is important to improve the wear resistance and maintain the resistance to slipping during ground contact.

In particular, the constant region from the edge of the bottom surface 50s on the toe T side where the sipe 13 is formed is a region corresponding to the arc X1 continuous from the toe T with a constant radius of curvature in FIG. As shown in the above, when the wearer wearing the competition prosthetic leg 1 performs the kicking-out operation, the wearer tends to come into contact with the ground at the end to cause more severe wear. Therefore, in this region, it is necessary to provide particularly high wear resistance. Therefore, the sipe 13 having a width smaller than that of the groove formed in another region is formed, and the edge component is distributed without impairing the rigidity. Therefore, the sole 5 can be protected from intense wear, and the service life of the foot 2 itself can be extended.

Examples of the present invention will be described below, but the present invention is not limited thereto.
The inventive example sole and the comparative example sole of the present invention are respectively prototyped and subjected to performance evaluation. The invention example sole is provided with functions such as drainage performance defined in the present invention by the arrangement of the pattern of the bottom surface of the sole and the change of the groove. Comparative Example 1 is a sole having the pattern shown in FIG. In the pattern shown in FIG. 7, a plurality of land portions 15 are arranged. Invention Example 1 is a sole having the pattern shown in FIG. 2 on the bottom surface, and Invention Example 2 is a sole having the pattern shown in FIG. 5 on the bottom surface. The drainage performance and the wear resistance performance indicate that the larger the index, the better the drainage performance and the wear resistance performance, with the index of Comparative Example 1 being 100.
The comparative example sole and the invention example sole manufactured as described above are mounted on the prosthetic leg for competition shown in FIG. 1, and the anti-slip performance and the anti-wear performance are evaluated.

[Anti-slip performance]
The following test is performed in a state where a 1 mm water film is applied to the glass surface and a load of 980 N is applied to the prosthetic leg for competition. Attach a spring only to the connection part between the prosthetic leg for competition and the stump of the foot, pull the competition artificial leg to the toe side in the longitudinal direction of the foot with only the spring, and the value of the spring only when the prosthetic leg for competition starts to slide Is indexed. In addition, when the index of Comparative Example 1 is set to 100, the larger the index, the better the anti-slip performance.
[Abrasion resistance]
A player with healthy feet on the left side wears a prosthetic leg for competition on the right side, and the overall appearance of the sole bottom after running 200 km on a public road is indexed. In addition, the index of the comparative example 1 is set to 100, and it shows that a sole is excellent in abrasion resistance performance, so that a numerical value is large. In Comparative Example 1 and Inventive Example 2, a player with healthy feet on the left side wears a prosthetic leg for competition on the right side, and the appearance of the bottom surface of the sole is indexed after traveling 200 km on a public road. Also in Invention Example 1, the appearance of the bottom surface of the sole is indexed after a player with healthy legs on the left side wears a prosthetic leg for competition on the right side and travels 200 km on a public road.

1: prosthetic leg for competition, 2: foot part, 2a: straight part, 2b, 2c: curved part, 3: curved part, 4: grounding part, 4s: contact area, 5: sole, 5s, 50s: sole bottom, 10 11, 12, 14, 15: Land part, 10b: Toe side protrusion part, 10c: Curved part side protrusion part, 13: Sipe, 20: Width direction land part

Claims

A prosthetic leg for competition having a leaf spring-like foot portion extending to the toe side through at least one curved portion,
A sole to be attached to a contact area extending in an arc shape from the toe to the curved portion side,
The sole has a bottom surface shaped according to the extending shape of the contact area,
The sole of the prosthetic leg for competition, wherein the bottom surface includes a land portion defined by a plurality of grooves, and the groove includes only a width direction groove extending in a width direction of the foot portion.
The sole of the prosthetic leg for competition according to claim 1, wherein the land portion is a width direction land portion extending in a wavy shape in the width direction of the foot portion.
3. At least one of the widthwise land portions has a wave shape that is symmetric with respect to a line segment that extends in the front-rear direction of the foot portion through a wave peak or valley in one wavelength of the wave. Prosthetic sole for competition.
The athletic prosthetic sole according to claim 2, wherein at least one of the widthwise land portions has a wavy shape in which the land width in a half wavelength of the wave is a wide and narrow repetition.