JP2000197503A - Cushioning structure of shoe sole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve easily and reliably the cushioning property by devising a structure of a shoe sole by supporting a shear deformation element in an upper position displaced forward with respect to the tread and shear-deforming it independently so that it may fall forward due to load from above. SOLUTION: A shear deformation element 11 is supported by a support member 3 in an upper position displaced forward F with respect to the tread 20 of a shoe sole 1 in a cushioning portion 10 provided at the shoe sole 1, and is shear-deformed independently so that it may fall forward F by load from above. The shear deformation element 11 is provided with a front end 11a and a rear end 11b which are tilted forward F as they go upward. Therefore, the shear deformation element 11 is compressively deformed and shear-deformed in a state of falling forward F due to load W from above when it touches the ground during walk. At this time, generally speaking as absorption energy of shear deformation is greater than compression deformation, even small deformation can absorb sufficiently great energy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole, and more particularly to a buffer structure.

[0002]

2. Description of the Related Art Conventionally, shoe soles have been required to have cushioning performance.

[0003]

However, conventional shoe soles generally absorb the impact of walking by losing energy due to compressive deformation of a buffer such as a midsole. However, in the absorption (loss) of energy due to such compressive deformation, the amount of absorption is generally small, so that sufficient cushioning property has not been obtained. On the other hand, if the midsole is thickened to increase energy loss, the lightness of the shoe sole is impaired.

Accordingly, an object of the present invention is to improve the cushioning property by newly devising the structure of the sole itself.

[0005]

The structure of the present invention will be described with reference to FIG. A buffer 10 is provided on the sole 1. The buffer portion 10 is supported by the support member 3 at an upper position displaced forward F with respect to the ground surface 20 of the sole 1, so that the buffer portion 10 is independently moved forward F by an upper load W. And a shear deformation element 11 that exhibits shear deformation.

[0006] The shear deformation element 11 has a front end face 11a and a rear end face 11b. The shear deformation element 11
The front end face 11a and the rear end face 11b are each inclined forward F as going upward. Thereby, the longitudinal sectional shape of the shear deformation element 11 is formed, for example, in a substantially parallelogram shape. As described above, since the both end surfaces 11a and 11b are inclined, the shear deformation element 11 is compressed and deformed by the load W at the time of landing while walking as shown by a two-dot chain line in FIG. At the same time, a shear deformation is caused to fall forward F. In addition, the preferable inclination angle θ of the end faces 11a and 11b
Is set to about 30 ° to 60 °. More preferably,
It is set to about 40 ° to 50 °.

[0007] In the present invention, the term "buffer" refers to a portion of the shoe sole other than the outer sole (ground contact bottom) and the inner sole that receives a load from the foot. In addition, the support member 3 is generally formed of an insole or a cup insole. “To exhibit shear deformation” means that, when a vertical load W is applied, the frontward F becomes large and shear deformation is exhibited. Further, “independently” means that the continuity of deformation is small or little with respect to the other portion 12 of the cushioning portion 10, or the shearing deformation element 11 causes a much larger shear deformation than the other portion 12. Means to present.

According to the present invention, when a load W is applied from above, the shear deformation element 11 is deformed so as to fall forward as indicated by a two-dot chain line. That is, it is sheared.
Here, in general, the energy absorbed by the shear deformation is much larger than that of the compression deformation, so that even a small deformation can absorb a sufficiently large energy.

In the present invention, the shear deformation element 11 may be formed independently of the other portion 12 of the buffer section 10 as shown in FIG. 6 (a), but as shown in FIG. 6 (b). It may be integrally formed via the thin connecting portion 13. Although only one shear deformation element 11 may be provided as shown in FIG. 6 (a), as shown in FIGS. 6 (b) and 6 (c),
Two or more may be provided. When two or more shear deformation elements 11 are provided, another buffer element 14 may be provided between the shear deformation elements 11.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. As shown in FIG.
Has a sole 1 and an upper U provided above the sole 1. As shown in FIG. 1B, the shoe sole 1 is formed by integrally joining a ground sole (outer sole) 2, a buffer 10, and a support member 3 to each other. The support member 3 shown in FIG. 2 is joined to the instep U and receives a load W from the foot, and has a winding portion 30 at the rear end and on both sides as shown in FIG.

The cushioning portion (midsole) 10 is composed of a foam 10a made of a resin such as EVA and a soft cushioning member 10b. The upper surface and the inner side surface 15 of the foam 10a are fixed to the bottom surface or the winding portion 30 of the support member 3 with an adhesive. On the lower surface of the foam 10a shown in FIG. 1A, a grounding bottom 2 shown in FIG.
Is fixed. The foam 10a of FIG. 3 includes a shear deformation element 11 and a compression deformation element 12 which is another part different from the shear deformation element 11. Compression deformation element 12
, As in ordinary shoes, absorbs shock by exhibiting compressive deformation.

In FIG. 3, for example, two shear deformation elements 11 are provided, and the axis C thereof is inclined obliquely forward F as going upward. That is, since the shear deformation element 11 is supported by the support member 3 at an upper position displaced forward F with respect to the ground contact surface 20 (FIG. 2), the shear deformation element 11 falls forward F when receiving a load W from above. At this point, the portion exhibits shear deformation independently of the other portions. As a result, the shock during running or walking is buffered. In this specification, the “axis C” refers to an axis connecting the centroids of a plane cross section (a cross section parallel to a horizontal plane) of the shear deformation element 11.

Here, in order for the shear deformation element 11 to exhibit sufficient shear deformation, it is necessary that the shear deformation element 11 has a plane cross section of a predetermined size. That is, it is necessary for the shear deformation element 11 to perform shear deformation without causing bending deformation. Therefore, a truss or a honeycomb formed from a thin rod-shaped or plate-shaped element is not included in the scope of the present invention. In this embodiment, the shear deformation element 11 is formed integrally with the compression deformation element 12 and the adjacent shear deformation element 11 via the thin connecting portion 13 shown in FIGS.

The shear deformation element 11 shown in FIG.
It is preferable to provide it on the outside of the rear foot part in the above. When running and walking, it generally lands from the outside of the hind foot,
This is for reducing the impact at the time of landing.

Another cushioning element 14 having a smaller Young's modulus than the shearing element 11 is provided between the plurality of shearing elements 11. These cushioning elements 14 allow the shearing elements 11 to shear without being constrained to each other.

In FIG. 5, the buffering element 14 is a so-called gel 14 in a sealed container 14a made of, for example, resin.
b is filled. These cushioning elements 14 absorb the impact from the upper supporting member 3 and are arranged in the recesses 17 of the foam 10a as shown in FIG. .

In the above-described embodiment, the shear deformation element 11 is formed integrally with the foam 10a. However, it is not always necessary to form the shear deformation element 11 integrally, and it may be formed separately. However, since the number of parts increases when molded separately, it is preferable to mold them integrally. In the present invention, it is not always necessary to provide another cushioning element 14.

[0018]

As described above, according to the present invention,
Since the shock buffering is performed by shearing deformation when receiving a load from above, a large cushioning property can be exhibited with a compact structure.

[Brief description of the drawings]

FIG. 1A is a plan view of a midsole showing a state where an outer sole is not fixed, and FIG. 1B is a side view of a shoe sole according to an embodiment of the present invention.

FIG. 2 is a perspective view of the shoe as viewed obliquely from behind.

FIG. 3 is an exploded perspective view showing a buffer portion and a support member.

FIG. 4 is an exploded perspective view showing a foam body and a soft cushioning member of the cushioning unit.

FIG. 5 is a sectional view taken along line VV of FIG.

FIG. 6 is a sectional view showing the principle of the present invention.

[Explanation of symbols]

 1: Shoe sole 10: Buffer part (midsole) 11: Shear deformation element 13: Thin connecting part 2: Outer sole 20: Tread surface 3: Support member C: Axis F: Front W: Load

Claims (10)

[Claims] The present invention relates to a shoe sole cushioning structure in which a cushioning portion is provided on a shoe sole, and is supported at an upper position displaced forward with respect to a ground contact surface, so that the shoe is moved forward by a load from above. A cushioning structure for a shoe sole, wherein the cushioning portion includes a shearing deformation element which independently exhibits shearing deformation so as to fall down. 2. A cushioning structure for a shoe sole having a midsole interposed between an upper suitable for wrapping the instep and an outer sole having a tread surface on an outer surface, wherein the midsole comprises: A shear deformation element, wherein the shear deformation element has a front end face and a rear end face, wherein the front end face and the rear end face of the shear deformation element each have:
The shoe sole cushioning structure in which the shear deformation element is sheared by a load at the time of landing during walking while the both end faces are tilted forward as it goes upward. 3. The cushioning structure for a shoe sole according to claim 1, wherein the shear deformation element is formed independently of the cushioning portion or another portion of the midsole. 4. The shoe sole cushioning structure according to claim 1, wherein the shear deformation element is formed integrally with the cushioning portion or another portion of the midsole via a thin-walled connecting portion. 5. The shoe sole buffer structure according to claim 1, wherein the shear deformation element is provided on a rear foot portion of the buffer portion or the midsole. 6. The shoe sole cushioning structure according to claim 3, 4 or 5, wherein the shear deformation element is provided on an outer portion of a foot. 7. The shoe sole buffer structure according to claim 3, wherein the plurality of shear deformation elements are provided. 8. The cushioning structure for a shoe sole according to claim 3, wherein an axis connecting the centroids of planar cross sections of the shear deformation element is inclined forward as going upward. 9. The shoe sole according to claim 1, wherein the sole is formed on a lower surface of the midsole, the supporting member being joined to an upper and receiving a load from a foot, a midsole constituting the cushioning portion, and a lower surface. An outer sole, wherein the shear deformation element is fixed to a bottom surface or a side surface of the support member. 10. The device according to claim 7, wherein a buffer element having a Young's modulus smaller than that of the shear deformation element is provided between the plurality of shear deformation elements, so that the shear deformation elements are not restrained from each other. A shoe sole cushioning structure that is configured to be shearable.