JPWO2019203287A1 - Competition prosthesis sole - Google Patents

Abstract

A sole to be attached to a contact area of a competition prosthesis having a leaf spring-shaped foot extending toward the toe side through at least one curved portion, extending in an arc shape from the toe to the curved portion side. The sole has a bottom surface shaped to follow the extending shape of the tangent area, the bottom surface having at least one widthwise land portion partitioned by a plurality of widthwise grooves extending in the widthwise direction of the sole. The widthwise land portion is characterized in that both side walls facing the plurality of widthwise grooves are stepped from the groove bottom side of the plurality of widthwise grooves to the ground contact surface side.

Description

The present invention relates to a sole that is attached to the contact area of a competition prosthesis, particularly a sole of a competition prosthesis that achieves both improvement in anti-slip performance and securing of a ground contact area.

Conventionally, a competition prosthesis (hereinafter, also referred to as a competition prosthesis or simply a prosthesis) having a leaf spring-like foot extending to the toe side via a curved portion and having a contact area extending in an arc shape from the toe to the curved portion side. Is known. In a competition artificial limb having such a leaf spring-shaped foot, a sole that comes into contact with the road surface is generally attached to the bottom surface of the contact area.

For example, Patent Document 1 exemplifies a sole attached to the lower surface of a curved leaf spring-shaped artificial limb for competition, which corresponds to a sport such as jogging or running. That is, Patent Document 1 describes a sole on which spikes are attached on the lower surface of the sole that comes into contact with the road surface, and a sole that is provided with a large number of outsole portions each having a hexagonal ground contact surface.

Japanese Unexamined Patent Publication No. 2016-150189

However, in the sole exemplified in Patent Document 1, the suppression of slipping of the artificial limb, that is, the anti-slip property is not considered at all. For example, when competing in the rain, the vehicle will run on a wet road surface. At that time, if a water film is present on the road surface, the water film is interposed between the bottom surface of the sole and the road surface, and the contact of the bottom surface of the sole is hindered, resulting in slip. In particular, on road surfaces such as asphalt and cobblestones with a low coefficient of friction μ, the wearer of the artificial limb may hesitate to accelerate further. Therefore, in order for the wearer of the artificial limb to fully demonstrate his running skill as an athlete, a sole having high anti-slip performance is required.

In addition, as the overall speed of the competition using the artificial limbs for competition is increased, it is an issue to secure the contact area with respect to the road surface in order to enable stable running.

Therefore, an object of the present invention is to provide a sole for a competition prosthesis that has improved anti-slip performance and secured a ground contact area.

The inventor has diligently studied means for solving the above problems. That is, when the bottom surface of the sole of the artificial limb for competition was examined in detail, a groove was provided on the bottom surface to give an edge component due to unevenness, and the grip force against the road surface was secured through this edge component to run. I came up with the idea of being able to prevent slipping. Furthermore, they have found that it is possible to secure a ground contact area with respect to the road surface by devising the shape of the unevenness, and have completed the present invention.

The sole of the competition prosthesis of the present invention is a contact of a competition prosthesis having a leaf spring-shaped foot extending toward the toe side via at least one curved portion, extending in an arc shape from the toe to the curved portion side. An area-mounted sole, the sole having a bottom surface shaped to follow the extending shape of the tangent area, the bottom surface being partitioned by at least a plurality of widthwise grooves extending in the width direction of the sole. It has one widthwise land portion, and the widthwise land portion has a stepped shape in which both side walls facing the plurality of widthwise grooves are directed from the groove bottom side to the ground contact surface side of the plurality of widthwise grooves. It is characterized by that.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a sole for a competition prosthesis that has improved anti-slip performance and secured a ground contact area.

It is a side view of the artificial limbs for competition which the sole which concerns on one Embodiment of this invention is attached. It is a figure which shows the pattern of the bottom surface of the sole which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is a figure which shows the variation of the land part in the width direction. It is a figure which shows the variation of the land part in the width direction. It is a figure which shows the variation of the land part in the width direction. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure for stepwise explaining the movement of the foot and the ground contact form in the case where a competition prosthesis is worn and the wearer runs straight. It is a figure which shows the pattern of the bottom surface of the sole which concerns on other embodiment of this invention.

Hereinafter, the sole of the artificial limb for competition (hereinafter, also referred to as a sole) of the present invention will be described in detail by exemplifying an embodiment thereof with reference to the drawings.

FIG. 1 is a side view of a competition prosthesis 1 to which the sole 5 according to the first embodiment of the present invention is attached. The competition prosthesis 1 has a leaf spring-shaped foot portion 2, and the sole 5 is attached to the contact area on the tip end side thereof. Although not shown, the base end of the foot 2 is connected to the socket via an adapter, and the wearer wears the artificial limb by accommodating the stump of the wearer's foot in the socket. be able to. As the adapter and socket, those corresponding to the stump position of the foot, such as a thigh artificial limb and a lower leg artificial limb, are used. FIG. 1 shows a foot portion 2 and a sole 5 in an upright state of a wearer wearing a competition prosthesis 1.

Hereinafter, in the present embodiment, the side where the foot portion 2 is connected to the adapter is referred to as a connection side, and the side which is in contact with the road surface S is referred to as a ground contact side in the height direction of the competition prosthesis. Further, the toe T of the artificial limb 1 for competition refers to the point where the foot portion 2 extends from the connection side and ends.

In the present embodiment, the foot portion 2 of the competition prosthesis 1 has a shape extending in a plate shape toward the toe T side via at least one curved portion, that is, the curved portion 3 of 1 in the illustrated example. In FIG. 1, the foot portion 2 has a straight portion 2a, a curved portion 2b convex to the toe T side, a curved portion 3 convex to the rear side in the front-rear direction Y of the foot, and a concave portion to the ground contact side, in this order from the connection side to the ground contact side. It is composed of a curved portion 2c of the above and a ground contact portion 4 extending to the toe T side in an arc shape that is convex toward the ground contact side.

Although the material of the foot portion 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 ground contact portion 4 has a contact area 4s extending in an arc shape from the toe T to the curved portion 3 side on the ground contact side, and the sole 5 is attached to the contact area 4s. The contact area 4s refers to the entire area in contact with the road surface S when the wearer wearing the competition prosthesis 1 performs a straight running motion, and when the sole 5 is attached, the contact area 4s is the sole 5. It comes into contact with the road surface S via.

The material of the sole 5 is not particularly limited, but rubber or the like can be used, for example.

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

Hereinafter, the direction in which the sole bottom surface 5s extends from the toe T side to the curved portion 3 side is referred to as the Y direction, and the width direction of the sole bottom surface 5s orthogonal to the Y direction is referred to as the W direction. Further, the thickness direction of the sole 5 is referred to as the Z direction.

FIG. 2 is a diagram showing a pattern of a sole bottom surface 5s according to an embodiment of the present invention. In the illustrated example, at least one widthwise land portion 10 partitioned by a plurality of widthwise grooves 20 extending in the W direction is arranged on the bottom surface 5s of the sole, and in the illustrated example, three rows of widthwise land portions 10 are arranged.

FIG. 3A is a cross-sectional view orthogonal to the extending direction of the land portion 10 in the width direction, that is, a cross-sectional view taken along the line II-II of FIG. As shown in the figure, the width direction land portion 10 is a two-step staircase in which both side walls 10W and 10Wb facing the plurality of width direction grooves 20 are directed from the groove bottom 20b side of the plurality of width direction grooves 20 to the ground contact surface 10s side. It is in the shape. In the illustrated example, the side wall 10W has a side wall portion Sa1 extending in the Z direction and a side wall portion Ca1 extending in the Y direction forming the first step P1 from the groove bottom 20b side, and further, a ground contact surface from the side wall portion Ca1. It has a side wall portion Sa2 extending in the Z direction toward 10s. Further, the side wall 10Wb has a side wall portion Sb1 extending in the Z direction and a side wall portion Sb1 extending in the Y direction forming the first step P1 from the groove bottom 20b side, and further, from the side wall portion Cb1 toward the ground contact surface 10s. It has a side wall portion Sb2 extending in the Z direction. In the present embodiment, the step formed by the side wall portions Sa2 and Sb2 and the ground plane 10s is referred to as a second step P2.

By making the side walls 10Wa and 10Wb stepped, a high edge function is given to the bottom surface 5s of the sole, and a grip on the road surface S when the wearer of the competition prosthesis 1 performs a straight running motion on the land portion 10 in the width direction. It is possible to exert force and improve anti-slip performance. Further, when the road surface S side, that is, the second stage P2 first touches the road surface S and is compressed, the water interposed between the first stage P1 and the road surface S is pushed out to the road surface S side. Since water can be efficiently discharged, the drainage performance is improved and higher anti-slip performance can be obtained. Further, since the second stage P2 is compressed, the side wall portions Ca and Cb1 of the first stage P1 can also be grounded to the road surface S, so that the ground contact area can be secured.

The number of steps of both side walls 10W and 10Wb is arbitrary as long as they are stepped, but according to the configuration of two steps, the drainage performance can be improved while maintaining the high rigidity of the land portion 10 in the width direction. it can.

In the present embodiment, the height h1 of the land portion 10 in the width direction in the Z direction and the maximum length w1 in the direction orthogonal to the extending direction of the land portion 10 in the width direction are such that the height h1 is the length w1. It is preferably 1.5 times or more and 10.0 times or less. According to this configuration, when the wearer of the competition prosthesis 1 runs, it is possible to impart sufficient rigidity to the land portion 10 in the width direction while giving appropriate flexibility to the bottom surface 5s of the sole.

Further, the maximum length w1 orthogonal to the extending direction of the land portion 10 in the width direction and the length w2 of the ground contact surface 10s of the land portion in the width direction orthogonal to the extending direction of the land portion 10 in the width direction are as follows. It is preferable that the relationship of the formula (1) is satisfied.
(Equation (1)) 0.3 ≦ (w1-w2) / w1 ≦ 0.9
By setting the relationship (w1-w2) / w1 between the maximum length w1 of the land portion 10 in the width direction and the length w2 of the ground contact surface 10s to 0.3 or more, the drainage performance due to the stepped side wall is more effective. By setting the value to 0.9 or less, it is possible to secure a sufficient contact area at the moment of the first contact of the land portion 10 in the width direction, and it is possible to improve the anti-slip performance.

The maximum length w1 orthogonal to the extending direction of the land portion 10 in the width direction is preferably 2.0 mm or more and 8.0 mm or less. By setting it to 2.0 mm or more, sufficient land rigidity is imparted to the land portion 10 in the width direction, and by setting it to 8.0 mm or less, the flexibility of the sole bottom surface 5s in the Y direction can be maintained. Preferably, the length w1 is 3.0 mm or more and 6.5 mm or less, and more preferably 3.8 mm or more and 4.5 mm or less.

Further, the length w2 of the ground contact surface 10s of the land portion in the width direction perpendicular to the extending direction of the land portion 10 in the width direction is preferably 0.5 mm or more and 2.5 mm or less. By setting the thickness to 0.5 mm or more, it is possible to sufficiently secure the ground contact area at the moment of the first ground contact of the land portion 10 in the width direction, and it is possible to improve the anti-slip performance. Further, by setting the thickness to 2.5 mm or less, the drainage performance due to the stepped side wall can be more effectively exhibited.

Further, the maximum height h1 of the land portion 10 in the width direction in the Z direction and the maximum height h2 of the step P2 including the ground contact surface 10s of the land portion 10 in the width direction satisfy the relationship of the following equation (2). Is preferable.
(Equation (2)) 0.25 ≤ h2 / h1 ≤ 0.67
By setting the height of the step P2 including the ground contact surface 10s, which first comes into contact with the road surface S, to 0.25 times or more the maximum height h1 of the land portion 10 in the width direction, the drainage performance due to the stepped side wall is obtained. By making it 0.67 times or less, the width direction land portion 10 can be provided with appropriate flexibility in the sole bottom surface 5s when the wearer of the competition prosthesis 1 runs. Can be imparted with sufficient rigidity.

The maximum height h1 of the land portion 10 in the width direction in the Z direction is preferably 1.0 mm or more and 7.0 mm or less. By setting it to 1.0 mm or more, sufficient drainage performance can be ensured, and by setting it to 7.0 mm or less, the flexibility and rigidity of the sole bottom surface 5s can be increased when the wearer of the competition prosthesis 1 runs. It can be compatible. More preferably, it is 2.0 mm or more and 3.5 mm or less, and more preferably 2.4 mm or more and 3.5 mm or less.

Further, the maximum height h2 in the Z direction of the step P2 including the land portion 10 ground contact surface 10s in the width direction is preferably 0.5 mm or more and 2.5 mm or less. By setting it to 0.5 mm or more, the drainage performance due to the stepped side wall can be more effectively exhibited, and by setting it to 2.5 mm or less, the bottom surface of the sole 5s when the wearer of the competition prosthesis 1 runs. It is possible to impart sufficient rigidity to the land portion 10 in the width direction while providing appropriate flexibility. More preferably, the maximum height h2 is 0.7 mm or more and 1.5 mm or less, and more preferably 1.2 mm or more and 1.5 mm or less.

The variation of the shape of the land portion 10 in the width direction is shown below.
FIG. 3B shows a land portion 10 in the width direction in which both side walls 10 Wa ₂ and 10 Wb _{2 are formed in a three-step step shape.} In the illustrated example, the side wall 10Wa ₂ has a side wall portion Sa1 extending in the Z direction and a side wall portion Ca1 extending in the Y direction forming the first step P1 from the groove bottom 20b side, and the second step P2 is provided. It has a side wall portion Sa2 extending in the Z direction from the side wall portion Ca1 toward the ground contact surface 10s side and a side wall portion Ca2 extending in the Y direction, and further, a side wall extending from the side wall portion Ca2 toward the ground contact surface 10s in the Z direction. It has a partial Sa3. Further, the side wall 10Wb ₂ has a side wall portion Sb1 extending in the Z direction and a side wall portion Cb1 extending in the Y direction, which form the first step P1 from the groove bottom 20b side, and constitutes the second step P2. It has a side wall portion Sb2 extending in the Z direction from the side wall portion Cb1 toward the ground contact surface 10s side and a side wall portion Cb2 extending in the Y direction, and further, a side wall portion Sb3 extending from the side wall portion Cb2 toward the ground contact surface 10s in the Z direction. have. In the example shown in FIG. 3B, the step formed by the side wall portions Sa3 and Sb3 and the ground plane 10s is referred to as the third step P2. According to the above configuration, the edge component in the Y direction can be increased, and higher drainage performance can be obtained. Further, when the land portion 10 in the width direction is grounded, the steps P3 and P2 are compressed in order from the grounding surface 10s side, so that a sufficient grounding area can be secured.

FIG. 3C shows a widthwise land portion 10 having side walls 10 Wa ₃ and 10 Wb _3. The step on the most groove bottom 20b side of the width direction land portion 10 has a shape in which the length orthogonal to the extending direction of the width direction land portion 10 gradually increases from the ground contact surface 10s side toward the groove bottom 20b side. There is. That is, as shown in the illustrated example, the step P1 on the most groove bottom side of the width direction land portion 10 has a width on the groove bottom 20b side from a length w3 orthogonal to the extending direction of the width direction land portion 10 on the ground contact surface 10s side. The length orthogonal to the extending direction of the land portion 10 in the width direction gradually increases up to the maximum length w1 orthogonal to the extending direction of the land portion 10 in the width direction. When the land portion 10 in the width direction touches down, the step P2 is compressed from the ground contact surface 10s side, but the step P1 is configured to gradually increase in length toward the groove bottom 20b side to resist the compression of the step P1. The rigidity is increased, and the ground contact area can be efficiently secured.

In the illustrated example, the Y-direction distance w4 from the boundary e1 between the widthwise land portion 10 and the groove bottom 20b on the toe T side to the side wall portion Ca1 of the step P1 and the widthwise land portion on the curved portion 3 side. The Y-direction distance w5 from the boundary e2 between the 10 and the groove bottom 20b to the side wall portion Cb1 of the step P1 has the same length, but may have different lengths. For example, when the Y-direction distance w4 is made longer than the Y-direction distance w5, the inclination of the step P1 to the groove bottom 20b becomes gentler on the curved portion 3 side than on the toe T side. Then, when the ground contact portion of the bottom surface 5s of the sole with respect to the road surface S changes from the curved portion 3 side to the toe T side, uneven wear of the land portion 10 in the width direction can be suppressed.

The Y-direction distance w4 and the Y-direction distance w5 differ depending on the wearer of the competition prosthesis 1, the competition event, and the like, but are preferably 0.5 mm or more and 2.5 mm or less, respectively. By setting it to 0.5 mm or more, it is possible to secure the rigidity of the land portion 10 in the width direction while improving the drainage performance, and by setting it to 2.5 mm or less, draining while securing the contact area with the road surface S. The performance can be fully exhibited. It is preferably 0.5 mm or more and 1.5 mm or less, and more preferably 0.5 mm or more and 1.0 mm or less.

Further, in FIG. 3D, the side _{wall portion Sa2 extending in the Z direction from the side wall portion Ca1 of the side wall 10Wa 4} toward the ground plane 10s has an arc r1 having a center of curvature radius outside the land portion 10 in the width direction, and the side wall. The side wall portion Sb2 extending in the Z direction from the side wall portion Cb1 of 10Wb ₄ toward the ground plane 10s has an arc r2 having a center of curvature radius outside the land portion 10 in the width direction. By configuring the side wall portions Sa2 and Sb2 to include an arc, the rigidity of the land portion 10 in the width direction can be increased.

Next, a suitable arrangement and number of the widthwise land portions 10 will be described with reference to FIGS. 4A, 4B, 4C, 4D and FIG.

4A, 4B, 4C, and 4D are diagrams for stepwise explaining the movement of the foot portion 2 and the contact state with the sole bottom surface 5s when the wearer wearing the competition prosthesis 1 runs straight. Is. The upper part of each drawing is a side view of the foot portion 2 and the sole 5, and the lower part of each drawing is a ground contact form of the sole bottom surface 5s when the wearer wearing the competition prosthesis 1 performs a straight running motion. It shows the transition.

FIG. 4A shows a state in which the competition prosthesis 1 lifted by the wearer is lowered onto the road surface S and the entire weight is applied to the competition prosthesis 1. As shown in the lower part of the drawing, when the artificial limb 1 is lowered onto the road surface S, the contact area of the sole bottom surface 5s is near the center of the bottom surface, and from the curved portion 3 side end of the sole bottom surface 5s and the toe T, Y Areas spaced in the direction.

FIG. 4B shows a state in which the wearer steps forward while keeping the entire weight loaded on the competition prosthesis 1 from the state of FIG. 4A. In the case of running a healthy person, it is common to step on the ground in order from the heel side of the shoe sole to the toe side, but the competition prosthesis 1 is more curved than the first ground contact. The grounding area has moved to the portion 3 side.

FIG. 4C shows a state in which the wearer swings the foot opposite to the side on which the competition prosthesis 1 is worn forward and starts the kicking motion of the competition prosthesis 1. In this kicking motion, the competition prosthesis 1 is in contact with the ground on the bottom surface 5s of the sole in a region on the toe T side of the region shown in FIGS. 4A and 4B.

FIG. 4D shows the state of the final stage in which the wearer kicks out the competition prosthesis 1 immediately before leaving the road surface S. In order to kick out from the toe T of the bottom surface 5s of the sole, the ground is further grounded in the area on the toe T side of FIG. 4C.

In the present embodiment, as shown in FIG. 2, the land portion 10 in the width direction is arranged in an area corresponding to the ground contact area shown in FIG. 4A. That is, the competition prosthesis 1 lifted by the wearer is lowered onto the road surface S, and the total weight is loaded on the competition prosthesis 1. Here, it is important that the region sufficiently grips the road surface S so that the balance of the entire body is maintained even if the wearer loads the entire weight on the competition prosthesis 1. The land portion 10 in the width direction is arranged in such a region to provide a high edge function by the stepped side wall, sufficiently secure a grip force against the road surface S, give a high anti-slip performance to the region, and provide a ground contact area. Can be secured.

In FIG. 2 described above, by arranging the land portions 10 in the width direction in three rows in the ground contact area shown in FIG. 4A, the anti-slip performance of the sole bottom surface 5s can be improved and the ground contact area can be reliably secured.

Next, the groove pattern of the bottom surface 5s of the sole of the competition prosthesis according to another embodiment will be described with reference to FIGS. 4A, 4B, 4C, 4D and 5 above. The sole of the competition prosthesis according to the second embodiment has the same basic configuration as that of the first embodiment, and a widthwise land portion having a chamfered portion is formed. , The shape of the land part in the width direction is different.

The pattern of the sole bottom surface 5s of the competition prosthesis sole according to the second embodiment is based on the above-mentioned knowledge regarding the transition of the ground contact form of the sole bottom surface 5s.

In FIG. 5, the sole bottom surface 5s has widthwise land portions 100, 110, 120 and 140 and sipes 130 extending in the widthwise direction W defined by the widthwise groove 200.

The land portion 100 in the width direction is curved with a extending portion 100a in the width direction extending in a substantially zigzag shape in the W direction and a protruding portion 100b on the toe side extending from a bent portion bending in a direction convex to the toe T side to the toe T side. The shape includes a curved portion-side protruding portion 10c extending from a bent portion that bends in a direction that is convex toward the portion 3 side to the curved portion 3 side. The width direction land portion 110 has a shape including a width direction extending portion 110a, a toe side protruding portion 110b, and a curved portion side protruding portion 110c. The width direction land portion 140 has the same shape as the width direction land portion 110.

Here, the area where the land portions 100 and 110 in the width direction are arranged reaches the ground contact area shown in FIGS. 4A and 4B above, the wearer first lands, and the total weight is loaded on the competition prosthesis 1. This is the area where the stepping motion is performed in the state of being depressed. Therefore, it is important that the region sufficiently grips the road surface S so that the balance of the entire body is maintained even if the wearer loads the entire weight on the competition prosthesis 1. By forming the extending portion 100a in the width direction in a zigzag shape and further forming the protruding portion 100b on the toe side and the protruding portion 100c on the curved portion side, the drainage function is effectively exerted along the Y direction, and the road surface S. It is possible to secure a sufficient grip force with and suppress the prosthesis from slipping, that is, to improve the anti-slip performance.

The width of the land portion 110 in the width direction is larger than that of the land portion 100 in the width direction. As shown in FIG. 4B, in the state of being stepped on immediately after landing, the ground contact area is changed to the curved portion 3 side, that is, the side opposite to the direction in which the wearer advances, from the first ground contact area. Here, the movement of the upper body that the wearer tries to move forward and the direction of the transition of the ground contact area are temporarily reversed, and the kicking motion in the latter half of the ground contact form shown in FIGS. 4C to 4D is shown. This is the stage where high propulsion is required. By arranging the width direction land portion 110 having a width larger than the width direction land portion 100 on the curved portion 3 side of the width direction land portion 100 to increase the land portion ratio, the rigidity of this arrangement region is increased and the stepping operation is performed. Achieves a high propulsive force to smoothly connect to the kicking motion.

The land portion 120 in the width direction extends in a substantially zigzag shape in the W direction, and the width of the land portion is repeatedly wide and narrow. , The extension of the width direction extending portion 120a from the toe side protrusion 120b extending so as to be convex in the extending direction of the width direction extending portion 120a and the bending portion bending in the bending direction of the bending portion 3 side. It is a shape including a curved portion side protruding portion 120c extending so as to be convex in the existing direction.

The region where the land portion 120 in the width direction is arranged is a region that comes into contact with the ground when the kicking operation of the competition prosthesis 1 is started, which is shown in FIG. 4C. By forming the shape so that the width of the land portion changes, it is possible to improve the drainage performance while increasing the rigidity of the land portion. In other words, by forming a shape in which a portion having a relatively large land width and a portion having a relatively small land width coexist, it is possible to avoid slipperiness due to the increase in the land width while increasing the land width. it can.

Further, the sole bottom surface 5s of the present embodiment includes a plurality of sipes 130 extending linearly in a direction inclined with respect to the W direction in a region from the edge on the toe T side toward the curved portion 3 side. Is preferable. In the area where the sipe 130 is arranged, as shown in FIG. 4D, the wearer swings the foot opposite to the side wearing the competition prosthesis 1 forward to perform the kicking motion of the competition prosthesis 1. Area of. This region is a region in which wear is particularly likely to progress because the ground contact is made in order toward the toe T and the wearer pushes the road surface S on the bottom surface 5s of the sole and touches the ground so as to slide. Therefore, in this region, it is important to improve the wear resistance performance and maintain the slip resistance at the time of touchdown.

In particular, a certain region from the edge of the sole bottom surface 5s on the toe T side on which the sipe 130 is formed is a region in FIG. 1 corresponding to an arc X1 continuous with a constant radius of curvature from the toe T. As shown in 4D, the wearer wearing the competition prosthesis 1 tended to touch the ground at the end and cause more severe wear when performing the kicking motion. Therefore, in this region, it is necessary to have particularly high wear resistance. Therefore, the sipe 130 having a width smaller than the groove formed in the other region is formed, and the edge component is distributed without impairing the rigidity. Therefore, the sole bottom surface 5s can be protected from severe wear, and the service life of the foot portion 2 itself can be extended.

In any of the embodiments, in the pattern of the sole bottom surface 5s, it is preferable that fluorine is applied to the groove wall and the groove bottom forming the width direction groove that divides the width direction land portion. By applying fluorine to the groove wall and the groove bottom of the groove in the width direction, the drainage performance on the bottom surface 5s of the sole can be improved.

1: Prosthesis for competition, 2: Foot, 2a: Straight part, 2b, 2c: Curved part, 3: Curved part, 4: Grounding part, 4s: Contact area, 5: Sole, 5s: Sole bottom, 10: Width Direction Land, 10Wa, 10Wb, 10Wa ₂ , 10Wb ₂ , 10Wa ₃ , 10Wb ₃ , 10Wa ₄ , 10Wb ₄ : Side wall, 20: Width groove, 20b: Groove bottom, e1, e2: Boundary, P1, P2, P3 : Step, Sa1, Sa2, Sa3, Ca1, Ca2, Sb1, Sb2, Sb3, Cb1, Cb2: Side wall part, 100, 110, 120, 140: Width direction land part, 130: Sipe, 100a, 110a, 120a: Width Directional extension, 100b, 110b, 120b: Toe side protrusion, 100c, 110c, 120c: Curved part side protrusion, Y: Direction in which the sole bottom surface 5s extends from the toe T side to the curved part 3 side, W: Width direction of sole bottom surface 5s orthogonal to Y direction, Z: thickness direction of sole 5

Claims (5)

A sole to be attached to a contact area extending in an arc shape from the toe to the curved side of a competition artificial limb having a leaf spring-shaped foot extending toward the toe side through at least one curved portion.
The sole has a bottom surface shaped to follow the extending shape of the tangent area.
The bottom surface has at least one widthwise land portion partitioned by a plurality of widthwise grooves extending in the widthwise direction of the sole.
The width direction land portion is characterized in that both side walls facing the plurality of width direction grooves are stepped from the groove bottom side of the plurality of width direction grooves to the contact patch side. Sole. The sole of a competition prosthesis according to claim 1, wherein both side walls facing the plurality of widthwise grooves are stepped in two steps from the plurality of widthwise grooves toward the contact patch side. The maximum length w1 orthogonal to the extending direction of the land portion in the width direction and the length w2 of the ground contact surface of the land portion in the width direction orthogonal to the extending direction of the land portion in the width direction are expressed by the following equations. The sole of a prosthetic leg for competition according to claim 1 or 2, which satisfies the relationship of (1).
(Equation (1)) 0.3 ≦ (w1-w2) / w1 ≦ 0.9 The maximum height h1 of the land portion in the width direction in the thickness direction of the sole and the maximum height h2 of the step including the ground contact surface of the land portion in the width direction satisfy the relationship of the following equation (2). The sole of a competition prosthesis according to any one of claims 1 to 3.
(Equation (2)) 0.25 ≤ h2 / h1 ≤ 0.67 Claimed, the step on the most groove bottom side of the width direction land portion has a shape in which the length orthogonal to the extending direction of the width direction land portion gradually increases from the ground contact surface side toward the groove bottom side. The sole of the artificial limb for competition according to any one of 1 to 4.

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