JP3650559B2 - Sole structure - Google Patents

Description

[0001]
[Background of the invention]
Field of Invention:
The present invention relates to a shoe sole structure.
[0002]
Description of conventional technology:
When the foot naturally walks, it performs an “original movement” in which the rear foot is twisted relative to the front foot. Such “tilting motion” will be described with reference to FIGS. 6 and 7.
[0003]
FIG. 6 is a plan view showing the skeleton of the foot.
In FIG. 6, B1 and B5 are the first and fifth metatarsals, B10 is the first metatarsal head corresponding to the mother limb, B50 is the fifth metatarsal head corresponding to the small limb, and B51 is The ribs of the little finger, J1 to J5 are the first to fifth metatarsal joints, Lj is the Lisfranc joint, and Sj is the Chopard joint.
[0004]
FIGS. 7A to 7F are rear views showing the motion of the foot performing the “tilting exercise” in time series.
As shown in FIG. 7A, the foot 3 lands from the outside 30 of the heel, and the entire sole 35 starts to land as shown in FIG. 7B. Thereafter, the load center of the foot 3 moves inward as if the rear foot 32 rotates inward as indicated by an arrow A1 in FIG. Thereafter, the heel begins to float due to the bending of the metatarsal joints J1 to J5 of FIG. 6, but first, the third to fifth metatarsal joints J3 to J5 of the middle foot are bent first, so FIG. The rear foot portion 32 of the foot of d) rotates outward as indicated by the arrow A2, and the load center moves to the small ball 33 outside the foot. Thereafter, when the first and second metatarsophalangeal joints J1 and J2 are also bent and the foot is bent as shown in FIG. 7 (e), the rear foot portion 32 of the foot is slightly rotated inward as indicated by an arrow A1, The load moves to the inner ball 34 on the inner side of the foot, and the forefoot 31 is kicked out with the outer ball 34 as the load center, so that the foot floats in the air as shown in FIG.
[0005]
An athletic shoe provided with a midsole is not easily stepped on during walking or running, and therefore tends to cause fatigue to the user. Therefore, in recent years, a shank piece is fixed to the lower surface of the midsole to prevent the deformation. However, the shank fixed to the lower surface of the midsole generally inhibits the “tilting motion”.
[0006]
On the other hand, as an example of the shank piece, by providing a strip-shaped or wire-shaped shank piece on the bottom side of the midsole, the rear foot can be easily twisted with respect to the front foot, and the foot is bent while twisting during walking. There is known a shoe sole structure that enables the “tilting motion” (Japanese Patent Laid-Open No. 63-194602). However, in this structure, when the “tilting motion” is performed, an appropriate deformation direction of the buffer bottom cannot be controlled, and therefore, the “tilting motion” cannot be promoted (promoted).
[0007]
In the “tilting exercise”, the soles land from the outer side 30 of the heel shown in FIG. 7A, and then the entire soles 35 shown in FIG. 7B land.
Further, as shown in FIGS. 7C to 7E, the foot floats in the air from the rear foot portion 32 of the foot, and subsequently, the load center moves to the small ball 33. Such foot movement is performed continuously and smoothly. However, in the prior art, since a stepped portion that is drowned is formed in the middle foot portion of the shoe sole, a smooth and continuous movement of the sole cannot be obtained. That is, since the foot cannot be smoothly rotated, the “tilting motion” cannot be promoted.
[0008]
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a shoe sole structure that can promote “foot movement” of the foot.
[0009]
In order to achieve the above object, the shoe sole structure according to the first aspect of the present invention first includes a shank piece on the middle foot portion of the shoe sole having the front foot portion, the middle foot portion, and the rear foot portion.
The shank piece has an oblique front end that intersects the Lisfranc joint portion of the foot. The oblique front end side is inclined so as to go outward as it goes forward of the foot so as to form an angle of 20 ° to 70 ° with the sole center line. The oblique front end is arranged such that an extension line obtained by linearly extending the oblique front end passes between the small ball of the metatarsal head of the little finger and the tip of the radius of the little finger.
By arranging the oblique front end side in this way, the shoe sole allows the shoe sole to bend and promote along a line substantially parallel to the oblique front end side slightly in front of the oblique front end side. .
[0010]
According to the first aspect of the invention, as described above, since the oblique front end side is set, the sole is bent along the line substantially parallel to the oblique front end side by the oblique front end side of the hard shank piece. It can encourage the “Aori Movement”.
[0011]
In the first invention, the shank piece can be formed of, for example, synthetic resin, FRP (fiber reinforced plastic), metal, or the like. Further, the shank piece may be provided with a rib in order to increase its bending strength.
In the first aspect of the present invention, “the portion of the Lisfranc joint” refers to a portion including the Lisfranc joint itself and a portion between the Lisfranc joints adjacent to each other.
In the present invention, the sole center line refers to a line on the shoe sole surface corresponding to a line connecting the tip of the second finger and the rear end of the heel.
[0012]
On the other hand, the shoe sole structure of the second aspect of the invention first has a ground contact surface on each of the front foot portion, the middle foot portion, and the rear foot portion, and a shank piece on the middle foot portion.
The ground contact surface of the middle foot portion generally bulges downward from the ground contact surfaces of the front foot portion and the rear foot portion. As for the said grounding surface, the center part of the shoe sole has bulged below the inner part and the outer part in general. In the middle foot, two lateral grooves are formed at positions corresponding to the Lisfranc joint and the Chopard joint. The deepest portions of these lateral grooves are formed deeper than the other concave grooves of the shoe sole.
In general, the depth of the deepest portion of the transverse groove is preferably 8.0 mm or more.
[0013]
According to the second aspect of the invention, as described above, the center part of the middle part of the shoe sole has a bulged shape, that is, the shoe ground contact surface is shaped like an elliptical sphere. The sole of the foot lands from the outside of the heel and the center of load moves from the middle foot to the small ball. Furthermore, since the two lateral grooves are provided corresponding to the Lisfranc joint and the Chopard joint, the shoe sole can be bent. Therefore, it is possible to encourage the “tilting exercise”.
[0014]
[Explanation of Examples]
The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and drawings are for illustration and description only. The scope of the present invention is defined based on the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.
[0015]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1A and 1B, the buffer bottom 2 includes a front foot portion 20, a middle foot portion 21, and a rear foot portion 22. The middle foot portion 21 is provided with the shank piece 1 from the front foot portion 20 to the rear foot portion 22. In the present embodiment, the ground contact bottom 4 is fixed to the rear foot portion 22, but the buffer bottom 2 may be formed by adhering an outer sole to a lower surface of a so-called midsole.
[0016]
A mounting recess 23 is provided in a substantially central portion of the inner side 61 and the outer side 60 of the foot in the buffer bottom 2. The mounting recess 23 has a shape corresponding to the shank piece 1, and the shank piece 1 is mounted in the mounting recess 23 from above. A hard inner sole (insole) 5 that supports a load from the foot is bonded to the upper surface of the buffer bottom 2.
[0017]
The shank piece 1 is formed in a substantially V shape. The shank piece 1 has a rib 14 indicated by a broken line, and is integrally formed of, for example, a synthetic resin. The shank piece 1 has a chevron-shaped chevron side 10, and the chevron side 10 is formed by smoothly connecting an oblique front end side 11 and an oblique rear end side 12. That is, a top portion 13 of the chevron side 10 is formed between the rear end of the oblique front end 11 and the front end of the oblique rear end 12. The shank piece 1 is arranged so that the mountain-shaped side 10 is convex toward the inner side 61 of the foot.
[0018]
As shown in FIG. 2, the oblique front end 11 intersects the Lisfranc joint Lj. More specifically, in this case, the oblique front edge 11 passes between two Lisfranc joints Lj adjacent to each other. A two-dot chain line L1 is an extended line obtained by linearly extending the oblique front side 11. The shank piece 1 is arranged so that the extension line L1 of the oblique front end side 11 passes between the small radius ball of the metatarsal bone head B50 of the little finger and the tip of the radius B51 of the little finger. The oblique front end side 11 is inclined so as to go to the outer side 60 as it goes to the front F of the foot. An angle θ formed by the extension line L1 of the oblique front end 11 and the sole center line CL is set to 20 ° to 70 °.
Thus, by arranging the front oblique side 11, the shoe sole is allowed to bend along the first bent line X <b> 1 substantially parallel to the front oblique side 11 slightly forward F of the front oblique end 11. And encouraged.
[0019]
The oblique rear end 12 intersects the Chopard joint Sj. The oblique rear edge 12 is inclined to the outer side 60 as it goes to the rear R of the foot.
In this way, by arranging the oblique rear end side 12, the shoe sole bends along the second bent line X <b> 2 substantially parallel to the oblique rear end side 12 slightly behind R of the oblique rear end side 12. Allowed and encouraged.
[0020]
That is, the shank piece 1 having the mountain-shaped side 10 allows and encourages the bending of the shoe sole along the substantially X-shaped lines X1 and X2 with the point O as the center. The point O is an intersection of the first bent line X1 and the second bent line X2. Further, the point O is set at a position approximately in the center of the middle foot portion 21 in the front-rear direction and closer to the inside 61 of the foot.
In FIG. 2, the angle θ is shown to be about 45 °, but when the angle θ is set to a small value, the position of the point O is set closer to the center, while the angle θ is set to a large value. If so, the position of the point O is set closer to the inner side 61.
[0021]
FIG. 3A is a bottom view of the shoe sole.
As shown in FIG. 3 (b-d), the ground contact surface of the shoe sole generally has a center portion 26 of the shoe sole bulging below the inner portion 27 and the outer portion 28. Further, as shown in FIG. 1B, the ground contact surface 21 a of the middle foot portion 21 bulges downward below the ground contact surfaces 20 a and 22 a of the front foot portion 20 and the rear foot portion 22.
[0022]
As shown in FIG. 3, a pair of lateral grooves 24 and 24 that enter between the front foot portion 20 and the rear foot portion 22 in the buffer bottom 2, that is, the middle foot portion 21 from the ground contact surface toward the sole. Is formed. These lateral grooves 24 are arranged at positions corresponding to the Lisfranc joint Lj and the Chopard joint Sj in FIG.
[0023]
The buffer bottom 2 is provided with several concave grooves 25 other than the lateral grooves. The lateral grooves 24 are wider and deeper than the concave grooves 25. The depth of the deepest portion 24d of the lateral groove 24 shown in FIG. 1B is preferably set to 8.0 mm or more, for example, and is formed deeper than the deepest portion of the other concave groove 25 of the shoe sole. As described above, the pair of lateral grooves 24 are formed wide and deep, so that the rear foot portion 22 is easily twisted around the sole center line CL of FIG. 2 with respect to the front foot portion 20.
[0024]
As shown in FIG. 3, the pair of lateral grooves 24 are formed obliquely at the end portion of the inner side 61 of the foot so as to approach each other as the inner end is approached. This facilitates bending of the shoe sole along the X-shaped lines X1 and X2 of FIG.
[0025]
Next, the behavior of the shoe sole during walking or running will be described. When the foot 3 is landed from the outside 30 of the heel to the entire sole 35 as shown in FIGS. 7 (a-b), the ground contact surface is an elliptical sphere as shown in FIGS. 1 and 3 (b-d). Since the surface is shaped like a surface, the load moves forward smoothly.
Further, when the load center moves inward as if the hind leg 32 of the foot rotates inward as indicated by an arrow A1 in FIG. As described above, since the central portion 26 bulges downward from the inner portion 27 and the outer portion 28, the load can be moved smoothly.
[0026]
Subsequently, as shown by an arrow A2 in FIG. 7D, when the rear foot portion 32 of the foot rotates outward, the shoe sole bends along the second bending line X2 in FIG. At this time, the oblique rear end side 12 of the shank piece 1 allows and encourages the bending of the shoe sole in the line X2.
[0027]
Thereafter, as shown in FIG. 7 (d-e), the sole is bent and the load center moves forward. At this time, the shank piece 1 prevents the arch from bending and allows the middle foot phalanx joints J1 to J5 to be bent. Further, since the ground contact surface 21a of the middle foot portion 21 in FIG. 1B swells smoothly downward than the ground contact surface 20a of the front foot portion 20, the load can be smoothly moved forward.
[0028]
Subsequently, as indicated by an arrow A1 in FIG. 7 (e), the foot is slightly rotated inward, and the first and second metatarsal joints J1 and J2 in FIG. The shoe sole bends greatly along X1. At this time, the oblique front end 11 of the shank piece 1 allows and promotes bending of the shoe sole along the line X1. Further, since the central portion 26 in FIG. 3 bulges downward from the outer portion 28, the load can be moved smoothly along with the bending.
Thereafter, by kicking out the front foot 31 of the foot with the main ball 34 as the load center, the foot floats in the air as shown in FIG.
[0029]
As described above, in this embodiment, the V-shaped shank piece 1 and the oval-spherical contact surface are provided, so that “foot movement” of the foot is allowed and promoted.
[0030]
4 (a) and 4 (b) show a second embodiment.
In this embodiment, the shoe sole includes a so-called midsole 2A and an outer sole 4A. In the present embodiment, a pair of lateral grooves 24 are formed from the outer sole 4A to the midsole 2A. The shank piece 1 is exposed downward in the lateral groove 24. On the midsole 2A, for example, an upper (not shown) made of cloth is bonded.
Other structures in the second embodiment are the same as those in the first embodiment, and the same reference numerals are given to the same or corresponding parts, and the description thereof is omitted.
[0031]
As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the planar shape of the shank piece 1 may be triangular as shown in FIG. However, it is possible to reduce the weight and improve the strength of the shank piece 1 by forming the rib 14 by forming it in a V shape as described above.
Moreover, the planar shape of the shank piece 1 may be a shape that approximates a T-shape by extending the oblique front end 11 and providing a protruding portion 15 as shown in FIG.
Moreover, the planar shape of the shank piece 1 may provide the rear part 16 extended toward back B, without providing the slanting rear edge 12 like FIG.5 (c).
Furthermore, a non-slip recess or protrusion may be provided on the ground contact surface of the shoe sole in addition to the lateral groove or the groove.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, the bending line of the sole is regulated by the shank piece having the oblique front end intersecting with the Lisfranc joint portion. The bending line can be obtained. Therefore, it is possible to assist the “tilting exercise” of the foot.
[0033]
Further, if the mountain-shaped side is formed on the shank piece, the “tilting motion” can be further promoted.
[0034]
Furthermore, the shank piece can be reduced in weight by forming the shank piece in a substantially V shape.
[0035]
On the other hand, according to the second invention, since the two lateral grooves are provided at positions corresponding to the Lisfranc joint and the Chopard joint, it is possible to bend the sole with a thick middle foot, While “tilting” is possible, the center of the middle foot bulges like an oval sphere on the ground surface of the shoe sole, so that “tilting” of the foot can be assisted.
[Brief description of the drawings]
1A is a plan view of a buffer bottom and a shank piece showing a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the buffer bottom taken along line Ib-Ib in FIG. It is a figure which decomposes | disassembles and shows the side surface of a shank piece and an inner bottom.
FIG. 2 is a plan view showing the relationship between the arrangement of shank pieces and the skeleton of a foot.
3A is a bottom view of a shoe sole, FIG. 3B is a sectional view taken along line IIIb-IIIb in FIG. 3A, FIG. 3C is a sectional view taken along line IIIc-IIIc, and FIG. It is IIId-IIId sectional view taken on the line.
FIG. 4A is a side view of a shoe sole, and FIG. 4B is a bottom view of the shoe sole.
FIGS. 5A, 5B, and 5C are plan views showing modifications of the shank piece, respectively.
FIG. 6 is a plan view showing a foot skeleton.
7 (a), (b), (c), (d), (e) and (f) are rear views of the foot showing the “tilting motion” of the foot. FIG.
[Explanation of symbols]
1: Shank piece 10: Mountain-shaped side 11: Front side edge 12: Back side edge 20: Front foot parts 20a, 21a, 22a: Ground contact surface 21: Middle foot part 22: Rear foot part 24d: Deepest part 26: Center part 27: medial part 28: lateral part B50: metatarsal bone head B51: rib CL: sole center line Lj: Lisfranc joint Sj: Chopard joint X1: first flex line X2: second flex line

Claims (10)

A shoe sole structure having a shank piece on a middle foot portion of a shoe sole having a front foot portion, a middle foot portion and a rear foot portion,
The shank piece has an oblique front end that intersects the Lisfranc joint portion of the foot;
The oblique front end side is inclined so as to go outward as it goes forward of the foot so as to form an angle of 20 ° to 70 ° with the sole center line,
The oblique front end side is arranged so that an extension line obtained by linearly extending the oblique front end side passes between the small radius ball of the metatarsal bone head of the little finger and the tip of the little finger rib,
By arranging the oblique front end side in this way, the shank piece allows the shoe sole to bend along a line substantially parallel to the oblique front end side slightly forward of the oblique front end side and promotes the shank piece. Sole structure designed to do. In the sole structure of Claim 1,
A shoe sole structure in which the shank piece has a mountain-shaped mountain-shaped side including the oblique front end, and the mountain-shaped side is convex toward the inside of a foot. In the sole structure of Claim 1,
The shank piece has an oblique rear end intersecting the Chopard joint of the foot;
The oblique rear edge is inclined to the outside as it goes to the rear of the foot,
The oblique rear edge is connected to the oblique front edge to form a mountain-shaped angle side,
By forming the mountain-shaped side in this way, the shoe sole along the substantially X-shaped line centered on the point near the inner side of the foot at the substantially central point in the front-rear direction of the middle foot part. Sole structure that allows bending. In the sole structure according to claim 1, 2, or 3,
A shoe sole structure in which the shank piece is formed in a substantially V shape. In any one of Claims 1 thru | or 4,
The forefoot part, the middle foot part and the rear foot part each have a ground contact surface,
The ground contact surface of the middle foot generally bulges below the ground contact surface of the front foot and the rear foot,
The ground contact surface generally has a shoe sole structure in which a center portion of the shoe sole bulges downward from an inner portion and an outer portion. In any one of Claims 1 thru | or 4,
The forefoot part, the middle foot part and the rear foot part each have a ground contact surface,
In the middle foot, two lateral grooves are formed at positions corresponding to the Lisfranc joint and the Chopard joint,
The deepest part of these lateral grooves is a sole structure formed deeper than the other concave grooves of the shoe sole. A shoe sole structure having a ground contact surface on each of the forefoot part, the middle foot part and the rear foot part and having a shank piece on the middle foot part,
The ground contact surface of the middle foot generally bulges below the ground contact surface of the front foot and the rear foot ,
The ground contact surface is generally shaped like a surface of an elliptical sphere, with the center portion of the shoe sole bulging below the inner and outer portions ,
In the middle foot, two lateral grooves are formed at positions corresponding to the Lisfranc joint and the Chopard joint,
The deepest part of the said lateral groove is a shoe sole structure currently formed deeper than the other concave groove of a shoe sole. In claim 6 or 7,
A sole structure in which the depth of the deepest portion of each lateral groove is set to 8.0 mm or more. In claim 6, 7 or 8,
The two lateral grooves are each a sole structure that is formed obliquely in the vicinity of the inner end of the foot so as to approach each other as the inner end is approached.   The sole structure provided with the sole structure of Claim 1 and Claim 7.

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