JP3270355B2 - Shank structure and shank material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a shank provided at a foot portion of a shoe.

[0002]

2. Description of the Related Art In sports shoes and the like, the outer sole is not provided on the stepped portion to reduce the weight of the shoe sole. Is provided with a shank material.

[0003]

Such a shank material is:
In general, the sole is made of a non-foamable synthetic resin, and therefore has a higher specific gravity than the foamed resin of the midsole. The present invention has been made in view of the above-mentioned conventional problems, and a main object of the present invention is to provide a shank structure capable of reducing the weight of a shank portion.

[0004]

In order to achieve the above object, a shank structure according to the present invention comprises a mesh layer made of a material having a higher Young's modulus than a material constituting the surface layer on a surface layer on the back of the shoe. The member is formed integrally.

According to the present invention, since the shank is formed of the mesh-shaped member, the shoe sole is lighter than the plate-shaped member. On the other hand, the mesh member alone does not exhibit any resistance to torsion because it has extremely low bending rigidity and torsional rigidity, but it is formed integrally with a surface layer such as a midsole, so that the reinforcing member in reinforced concrete is formed. It acts like a material and exerts resistance to twisting and the like. Moreover, the mesh-shaped member before molding has a very low bending rigidity, so unlike a sheet-shaped shank member,
Since it can be formed into an arbitrary three-dimensional shape, it can be formed into a shape resistant to twisting.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment. FIG.
In (a) and (b), the sole 1 is a midsole 2,
Outer bottom (ground bottom, outer sole) 3 and shank 4
It has. The outer sole 3 is for catching a road surface or a floor surface, is formed of rubber or the like having excellent wear resistance, and is provided separately from a tread portion and a heel portion.
The midsole 2 is provided mainly for shock absorption and rebound, and is made of, for example, a resin or rubber foam such as EVA (ethylene-vinyl acetate copolymer). It is formed of a material having a smaller Young's modulus.

The shank portion 4 is provided on the surface layer on the back of the midsole 2 (surface layer on the back of the shoe) between the front and rear outer soles 3 (stepping portion). That is, the shank portion 4 is provided in a hatched portion in FIGS. 1 (a) and 1 (b). The shank portion 4 is formed, for example, by forming the mesh member 5 as shown in FIG. 2 on the surface layer 2 of the midsole 2 in FIG.
a. As shown in FIG. 2, the mesh-shaped member 5 is formed by heat-welding the periphery of a pre-molded one so that the periphery is not frayed. The mesh member 5 is made of a material having a larger Young's modulus than the material constituting the midsole 2. For example, a non-foamable thermoplastic resin net such as polyamide, polyester, polypropylene or polyurethane or a metal net may be used. it can.
The mesh member 5 has a temperature at the time of molding (110 ° C.).
(120 ° C.) is preferred.

As shown in FIG. 1 (d), a material 2a constituting the midsole 2 enters between meshes 5a of the mesh member 5. As shown in FIG.
The mesh member 5 is wound up along the side surface of the midsole 2 and is formed into a three-dimensional uneven shape along the surface of the midsole 2 as shown in FIG.

The mesh member 5 is arranged such that the vertical fibers 5b and the horizontal fibers 5c of FIG. 2 are along the longitudinal direction (front-back direction) and the horizontal direction (left-right direction) of the shoe. The size of the mesh is, for example, 2
No. 0 to No. 30 (mesh roughness) can be suitably used, but the present invention does not limit the size of the mesh.

In the above configuration, since the shank structure uses the mesh member 5 shown in FIG. 2, the shoe sole is lighter than the plate-shaped shank member. On the other hand, the mesh member 5
Can be used alone, even if a material with a large Young's modulus is used.
Since the bending rigidity and the like are extremely small, they hardly exert a drag against torsion. However, when formed integrally with the surface layer 2a of the midsole 2 in FIG. 1D, the longitudinal fibers of the mesh member 5 in FIG. The intersection point 5d between 5b and the weft fiber 5c is constrained, and the bending rigidity is significantly increased. Therefore, the shank portion 4 of FIG. 1 exerts a large resistance against twisting and the like.

Here, even when a thin sheet-shaped shank member is used, weight reduction and improvement in bending rigidity can be achieved.
In the case of a sheet-shaped shank member, the bending rigidity of the sheet alone is large, so that the shank member cannot be formed into a complicated three-dimensional shape, and therefore, it is impossible to improve the geometric bending rigidity. On the other hand, in the shank structure and the shank member, the mesh-like member 5 before molding shown in FIG.
Since the bending rigidity and the like are extremely low, unlike a sheet-shaped shank member, it can be formed into an arbitrary three-dimensional shape as shown in FIGS. 1 (a) and 1 (c). Can be molded.

Due to the function and effect of the present shank structure, the mesh member 5 in the present invention includes, for example, a woven fabric or a net, but has a large number of holes formed in a flat plate like a punching metal. Does not include things.

FIG. 3 shows a second embodiment. In the present embodiment, as shown in FIG. 3E, a thin film 6 made of a thermoplastic resin such as polyurethane is formed integrally with the midsole 2 together with the mesh member 5.
The planar shape of the film 6 is the mesh member 5 shown in FIG.
In the same shape as above, a pattern composed of characters, figures, and the like is formed on the surface of the film 6.

Next, a manufacturing method will be described. A pattern is printed beforehand on the surface 6a of the film 6 in FIG. Next, a primer 7 is applied to the back surface of the mesh member 5, and the film 6 is bonded before the primer 7 dries as shown in FIG. After this lamination, the mesh member 5 and the film 6 are cut into a predetermined shape to obtain a shank member S integrated with the mesh member 5 and the film 6.

Then, after the back surface 6b of the film 6 is treated with a primer, and after the primer is dried,
As shown in (c), the adhesive 8 is applied to the back surface 6b of the film 6. In addition, as the adhesive 8, for example, a hot-melt adhesive such as TR (thermoplastic rubber) can be used. After the application of the adhesive 8, the shank member S is connected to the midsole 2 as shown in FIG.
And molded together. Thereby, as shown in FIG. 3E, a shank structure in which the material of the midsole 2 and the film 6 enter between the meshes 5a of the mesh member 5 is obtained.

The thickness of the film 6 varies depending on the material, but generally, a thickness of 20 μm to 200 μm can be used, preferably 30 μm to 100 μm, and more preferably 40 μm to 80 μm. If the film 6 is too thick, the bending stiffness and torsional stiffness of the mesh member 5 integral with the film 6 in FIG. 3B become too large, so that the formability is lowered and heat is hardly transmitted. On the other hand, if the film 6 is too thin, the film 6 melts during molding, and the pattern breaks.

The mold 9 used for molding in FIG. 4A is provided with a cylindrical positioning needle 9a in FIG.
The (c) conical positioning needle 9a is formed to position the shank member S. In general, the cylindrical positioning needle 9a shown in FIG. 4B is preferable as the positioning needle because the shank member S is less likely to come off. The other configuration of the second embodiment is the same as that of the first embodiment, and detailed description and illustration thereof are omitted.

According to the second embodiment, the film 6 shown in FIG.
By printing the pattern in advance, a clear pattern can be obtained. That is, unlike the surface of the midsole 2 or the thick resin plate, the film 6 is thin and soft, so that the pattern can be printed clearly.

In the present embodiment, the mesh member 5
Since the film 6 is bonded to the shank member S, unlike the case of only the mesh member 5 of the first embodiment in FIG. 2, the fibers around the mesh member 5 are not frayed. It is not necessary to heat weld the periphery of the shape member 5 in advance.

In the second embodiment, FIG.
Although the film 6 is interposed between the mesh member 5 and the midsole 2 in the present invention, the mesh member 5 is interposed between the film 6 and the midsole 2 as shown in FIG. Alternatively, the film 6 may be provided on the front and back of the mesh member 5 as shown in FIG.

In the above-described embodiment, the material in which the material of the midsole 2 and the film 6 enter between the meshes 5a of the mesh member 5 in FIG. 3 (e) has been described. Of intersection 5d of mesh member 5
Is restrained, and the mesh member 5 is
If the structure is integrated with the above, the bending rigidity and the torsional rigidity of the mesh-like member 5 are improved, and are included in the scope of the present invention.

In the present invention, "the mesh member 5 is integrally formed on the surface layer" means that the mesh member 5 is exposed on the surface of the mid sole 2 and the mid sole 2 And those in which part or all of the mesh-like member 5 is embedded.

[0023]

As described above, according to the present invention,
Since the shank is formed of the mesh member, the weight of the shoe sole can be reduced as compared with the case where the plate member is formed as the shank. On the other hand, the mesh member itself before forming has low bending rigidity and torsional rigidity, but exerts a large resistance to torsion like a reinforcing member by being integrally formed on a surface layer such as a midsole. . Moreover, since the mesh-shaped member before forming has extremely low bending stiffness and the like, unlike a sheet-shaped shank member, it can be formed into an arbitrary three-dimensional shape. . Therefore, it is possible to provide a shank structure that is lightweight and has sufficient strength.

Further, if the film is formed integrally with the mesh member, the mesh member can be prevented from fraying by previously forming the mesh member at the same time as the film. Also, if necessary, a clear pattern can be obtained by applying a pattern to the film in advance.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shoe sole according to a first embodiment of the present invention,
It is a side view, a cc line sectional view, and an enlarged sectional view of a surface layer.

FIG. 2 is a plan view of the mesh member according to the first embodiment.

FIG. 3 is a cross-sectional view illustrating a method of manufacturing a shank according to a second embodiment.

FIG. 4 is a perspective view and a partial cross-sectional view showing the shape of a mold.

FIG. 5 is a partial cross-sectional view showing another embodiment.

[Explanation of symbols]

 5: mesh member 6: film

Continuation of the front page (56) References JP-A-63-194602 (JP, A) JP-A 7-11904 (JP, U) JP-A 62-119804 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) A43B 13/42 101

Claims (4)

(57) [Claims] 1. A shank structure in which a mesh member made of a material having a higher Young's modulus than a material constituting the surface layer is integrally formed on a surface layer on the back of the shoe. 2. The shank structure according to claim 1, wherein a resin film is formed integrally with the mesh member on the surface layer of the back of the shoe. 3. The shank structure according to claim 1, wherein a material constituting the surface layer or the film enters between meshes of the mesh-like member. 4. The mesh member has a thickness of 20 μm to 20 μm.
A shank member laminated with a 0 μm resin film.