JP2005185306A - Shank structure of shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shank structure achieving an excellent effect of a shank and a reduction in weight of a shoe. <P>SOLUTION: An arch portion region of a sole includes an upper midsole 2 made of a flexible and elastic member and having a roll up portion 20 toward an inner upper side and an outer upper side, a center shank 41 disposed at a region between an inner arch part and an outer arch part of the arch portion region of the sole on the side of the bottom surface of the upper midsole 2, and having a Durometer D hardness of ≥40 according to JIS K 7215 and a thickness of 0.8-2 mm, and side shanks 7 and 8 interposed between the center shank 41 and the upper midsole 2 in the arch portion region of the sole, partially overlapping with the center shank 41 while extending to the side of the roll up portion 20 of the upper midsole 2, and having a thickness of ≤0.7 mm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shoe shank structure suitable for sports such as running, jogging, walking, and tennis, and more particularly, to a lightweight and excellent shank effect.

  In shoes, a shoe having a shank structure in the arch region of the sole has been proposed in order to exert a shank effect such as preventing twisting of the arch region of the sole and falling of the arch portion. For example, in Japanese Utility Model Laid-Open No. 7-34703, a synthetic resin shank member having a rolled-up edge extending on the inner and outer side of the midsole is provided.

  In this case, although the shank effect by the shank member can be ensured, the resin shank member extends from the arch region to the winding portion of the midsole, thereby increasing the weight of the entire shank structure. At the same time, there is a drawback that the feeling of foot contact in the arch area deteriorates.

  Moreover, in what is shown to Unexamined-Japanese-Patent No. 10-248609, the shank member consisting of a mesh-shaped member is provided over the whole arch area | region.

In this case, it is possible to reduce the weight of the entire shank structure, but there is a limit to improving the shank effect because all parts of the shank structure are made of mesh-like members.
Japanese Utility Model Publication No. 7-34703 JP-A-10-248609

  The problem to be solved by the present invention is to achieve an excellent shank effect and achieve weight reduction in the shank structure of a shoe.

  The present invention provides a thin central sheet shank that is provided with a relatively high-hardness central shank at the inner and outer arch portions of the sole arch region of the sole, and extends partially toward the winding portion of the midsole while partially overlapping the central shank. The most important feature is that

  The shank structure of the sole according to the invention of claim 1 is provided in a arch portion region of the sole, and includes a midsole made of a soft elastic member having winding portions toward the inner side and the outer side, and a bottom side of the midsole At least in the inner arch portion (ie, the longitudinal arch portion on the inner shell side) and the outer arch portion (ie, the vertical arch portion on the outer shell side) of the sole arch region, and having a D hardness of 40 or more in JIS K 7215 type The thickness of the central shank with a hardness of 5mm and the thickness between the central shank and the midsole in the arch region of the sole and between the central shank and the winding part of the midsole while partially overlapping the central shank And a sheet-like side shank of 0.7 mm or less.

  According to the invention of claim 1, since a thin sheet-like side shank is provided on the side of the winding portion of the midsole, compared to the case where the central shank extends to the side of the winding portion of the midsole, The overall weight of the shank structure can be reduced. In addition, the thin sheet-shaped side shank can prevent the arch from dropping without impairing the feeling of foot contact. In addition, in this case, the relatively high-hardness central shank is provided on at least the inner arch portion and the outer arch portion of the arch region of the sole, so that the torsion of the foot can be prevented and the kicking force of the foot can be prevented. Can be promoted. In this way, an excellent shank effect can be realized while ensuring weight reduction.

  Further, since the side shank is sandwiched between the central shank and the midsole and is partially overlapped with the central shank, the sheet-like side shank can be prevented from peeling off.

  The reason why the hardness of the central shank is defined as described above is that the D hardness of the JIS K 7215 type is at least 40 or more in order to promote kicking of the foot. Moreover, the reason why the thickness of the side shank is set to 0.7 mm or less is that when it is thicker than 0.7 mm, it becomes too hard when fixed to the midsole.

  In the invention of claim 2, the central shank extends to a region sandwiched between the inner arch portion and the outer arch portion in the arch portion of the sole, whereby it is possible to more effectively prevent the torsion of the foot, Can further promote the kicking power.

  In the invention of claim 3, the thickness of the region of 50% or more of the surface area of the central shank is 0.8 to 2 mm. The reason why the thickness is defined as 0.8 to 2 mm is that 0.8 mm is a limit thickness when injection molding is performed, and on the other hand, when the thickness is larger than 2 mm, the entire central shank becomes too heavy. Further, the reason why the region of 50% or more of the surface area of the central shank is defined in this way is to reduce the weight of the entire central shank.

  In invention of Claim 4, the thickness of the whole area | region of a center shank is 0.8-2 mm. In this case, the entire central shank can be further reduced in weight.

  In the invention of claim 5, the shank groove extending in the front-rear direction is formed in the central shank, whereby the shank effect can be more effectively exhibited.

  In the invention of claim 6, the corrugated sheet having a corrugated shape is disposed at a position corresponding to the heel portion of the sole on the bottom surface side of the midsole, and the central shank is integrally provided on the front end side of the corrugated sheet. Yes.

  In this case, since the central shank is provided integrally with the corrugated sheet that prevents the lateral movement of the collar, the molding process can be simplified and the assembly of the sole is facilitated. In this case, a connecting portion between the central shank and the corrugated sheet is also included in the central shank region.

  The overlap amount of the side shank with respect to the central shank is preferably 4 mm or more as described in the invention of claim 7.

  In the invention of claim 8, the side shank is constituted of a woven fabric, a knitted fabric, a nonwoven fabric, a film or a laminate thereof, or a woven fabric, a knitted fabric or a nonwoven fabric impregnated with a resin.

  As described in the invention of claim 9, the midsole preferably has a C hardness of JIS K 7312 of 40 or more and 65 or less.

  According to the shank structure of the present invention, it is possible to achieve an excellent shank effect and achieve weight reduction.

  1 to 5 are views for explaining a sole assembly of a shoe to which a shank structure according to an embodiment of the present invention is applied, wherein FIG. 1 is a bottom view of the sole assembly, and FIG. 2 is a sole assembly. FIG. 3 is a side view of the outer side of the sole assembly, FIG. 4 is a bottom view of the sole assembly of FIG. 1 with the front sole outsole and the lower midsole of the buttocks and the outsole removed. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 1 or FIG.

  As shown in FIGS. 1 to 3, the sole assembly 1 includes an upper midsole 2 that extends from a heel part H of a shoe to an arch part (medium foot part) M to a front foot part F, and a heel part. A lower midsole 3 disposed below the upper midsole 2 at H, a wave plate 4 extending from the heel H to the arch M, and sandwiched between the upper and lower midsoles 2 and 3; An outsole 5 fixed to the lower surface of the lower midsole 3 in the portion H, an outsole 6 fixed to the lower surface of the upper midsole 2 in the forefoot portion F, and an inner shell side and an outer shell side in the arch portion M, respectively. The side shanks 7 and 8 are arranged.

  The upper midsole 2 and the lower midsole 3 are, for example, a thermoplastic resin foam such as ethylene-vinyl acetate copolymer (EVA), a thermosetting resin foam such as polyurethane (PU), a butadiene rubber, or the like. It is composed of a soft elastic member such as a foam of rubber material such as chloroprene rubber. As the hardness of the upper and lower midsoles 2, 3, a hardness of 40 or more and 65 or less, preferably 60, is used as the C hardness of JIS K 7312 type.

  The upper midsole 2 has a winding portion 20 that projects upward over the entire circumference of the sole (see FIG. 5). The winding part 20 is a part fixed to the outer periphery lower part of the upper part of the shoe not shown. A plurality of grooves 21 extending in the width direction are formed on the lower surface of the heel portion of the upper midsole 2. These grooves 21 function as cushion holes for improving the cushioning property of the heel portion H when the sole assembly 1 is assembled. Similarly, a plurality of grooves 31 that function as cushion holes of the sole assembly 1 are formed on the upper surface of the heel portion of the lower midsole 3.

  The wave plate 4 has a corrugated portion 40 at the heel part (see FIG. 4). On the other hand, a corrugated surface corresponding to the corrugated portion 40 of the wave plate 4 is formed on the upper and lower midsole 2 and 3, and the corrugated portion 40 of the wave plate 4 corresponds to the upper and lower midsole 2 and 3. It is sandwiched between corrugated surfaces.

  The wave plate 4 has a central shank 41 at the arch. The central shank 41 is integrally extended on the front end side of the corrugated portion 40. The central shank 41 extends in a region sandwiched between the longitudinal arch portion on the inner side (that is, the inner arch portion) and the vertical arch portion on the outer side (that is, the outer arch portion). Therefore, in FIG. 4, the inner periphery 41A of the central shank 41 corresponds to the inner arch portion, and the outer periphery 41B of the central shank 41 corresponds to the outer arch portion.

  The wave plate 4 and the central shank 41 integrally formed with the wave plate 4 are made of, for example, polyurethane, polyamide elastomer (PAE), thermoplastic resin such as ABS resin, or thermosetting resin such as epoxy resin or polyester resin. Yes. In addition, as a raw material of the center shank 41, you may make it employ | adopt other high molecular compounds, such as a hard synthetic rubber and a synthetic fiber.

  As the hardness of the central shank 41, a hardness of 40 or more, for example 55, is used as the D hardness of JIS K 7215 type. As thickness of the center shank 41, 0.8-2 mm (for example, 1 mm) is used. The region having a thickness of 0.8 to 2 mm preferably occupies 50% or more of the surface area of the central shank 41, and more preferably occupies the entire surface area of the central shank 41. In addition, shank grooves 41 a and 41 b extending in the front-rear direction are formed on the inner and outer shell sides of the central shank 41. Furthermore, a plurality of through holes 41 c as air holes are formed in the central portion of the central shank 41. These through-holes 41c communicate with a plurality of through-holes 22 formed in the upper midsole 2 and opening on the sole contact surface 2a of the upper midsole 2 (see FIG. 5).

  Further, the arch portion M is provided with side shanks 7 and 8, respectively. The side shanks 7 and 8 are thin sheet-like members made of a woven fabric, a knitted fabric, a nonwoven fabric, a film, or a laminate thereof using, for example, resin fibers such as polyamide, polyester, polypropylene, or polyurethane. Or the side shanks 7 and 8 are comprised from the thin sheet-like member which impregnated resin to the woven fabric, the knitted fabric, or the nonwoven fabric. As the resin to be impregnated, for example, a thermoplastic resin such as polyamide, polyester, polypropylene, or polyurethane, or a thermosetting resin such as epoxy is used. The thickness of the side shanks 7, 8 is preferably 0.7 mm or less, for example, 0.5 mm. As shown in FIGS. 4 and 5, the side shanks 7 and 8 are attached to the lower surface of the upper midsole 2, and partially overlap the central shank 41, while being on the side of the winding part 20 of the upper midsole 2. It is extended to. Each overlap amount of the side shanks 7, 8 and the central shank 41 is set to 4 mm, for example.

Here, the molding process of the sole assembly 1 will be briefly described.
First, a primary molded upper midsole 2 and sheet-like side shanks 7, 8 are prepared, and the side shanks 7, 8 are positioned on the lower surface of the upper midsole 2 (or bonded with an epoxy resin adhesive or the like). ) And put them into a mold and perform a thermoforming process. Accordingly, the upper midsole 2 is formed into a desired shape, and the side shanks 7 and 8 are firmly fixed to the lower surface of the upper midsole 2.

  Next, the wave plate 4 including the central shank 41 injection-molded in another process is bonded to the lower surface of the upper midsole 2, and the lower midsole 3 and the outsole 5 and 6 are bonded to the lower surface thereof. In this way, the sole assembly 1 is obtained. And the shank structure by this invention is comprised by the arch part of the upper midsole 2, the center shank 41, and the side shanks 7,8.

  According to such a shank structure, since the thin sheet-like side shanks 7 and 8 are provided on the winding portion 20 side of the upper midsole 2, the central shank 41 is connected to the winding portion 20 of the upper midsole 2. Compared with the case where it extends to the side, the weight of the entire shank structure can be reduced. Further, the side shanks 7 and 8 can prevent the vertical arch from dropping without impairing the feeling of foot contact. In addition, in this case, the central shank 41 having a relatively high hardness is provided in a region sandwiched between the inner arch portion and the outer arch portion of the sole arch region, so that the torsion of the foot is effectively prevented. It can prevent, and can further promote the kicking force of the foot. In this way, an excellent shank effect can be realized while ensuring weight reduction.

  Further, part of the sheet-like side shanks 7 and 8 is sandwiched between the central shank 41 and the upper midsole 2, so that the side shanks 7 and 8 can be prevented from peeling off.

  Furthermore, the shank groove | channels 41a and 41b extended in the front-back direction are formed in the center shank 41, and this can promote a shank effect.

  Further, since the central shank 41 is integrally provided on the front end side of the corrugated sheet 4, the molding process can be simplified and the sole can be easily assembled.

  The reason why the hardness of the central shank 41 is defined as described above is that at least 40 degrees or more is required as the D hardness of the JIS K 7215 type in order to promote kicking of the foot. Further, the thickness of the side shanks 7 and 8 is set to 0.7 mm or less because if the thickness is larger than 0.7 mm, the side shanks 7 and 8 become too hard when fixed to the midsole.

  Further, the thickness of the central shank 41 is defined as 0.8 to 2 mm as described above, and 0.8 mm is the limit thickness when injection molding is performed. Because it becomes too heavy.

  In the embodiment, the central shank 41 is disposed in a region sandwiched between the inner arch portion and the outer arch portion. However, the central shank 41 includes at least the inner arch portion and the outer arch portion. What is necessary is just to be arrange | positioned. When the central shank is provided only in the inner arch portion and the outer arch portion, the feeling of foot contact in the arch region can be further improved.

1 is a bottom view of a sole assembly according to an embodiment of the present invention. FIG. It is a top view of a sole assembly (FIG. 1). It is an outer side side view of a sole assembly (FIG. 1). It is a bottom view of the state which removed the outsole of the front foot part, the lower midsole of the heel part, and the outsole in the sole assembly (FIG. 1). FIG. 5 is a cross-sectional view taken along line VV in FIG. 1 or FIG. 4.

Explanation of symbols

1: Sole assembly

2: Upper midsole 20: Winding part

4: Wave plate 41: Central shank 41a, 41b: Shank groove

5, 6: Outsole

7, 8: Side shank

M: arch

Claims (9)

The shank structure of the sole,
A midsole made of a soft elastic member, which is disposed in the arch portion region of the sole, and has a winding portion toward the inner side and the outer side,
A central shank disposed on at least the inner arch portion and the outer arch portion of the arch portion region of the sole on the bottom side of the midsole, and having a D hardness of JIS K 7215 type of 40 or more;
A sheet with a thickness of 0.7 mm or less, which is interposed between the central shank and the midsole in the arch region of the sole, and extends to the side of the midsole while partially overlapping the central shank. Side shank and
A shank structure with a sole. In claim 1,
The central shank extends to the area sandwiched between the inner and outer arch portions at the arch of the sole,
The shank structure of the sole characterized by this. In claim 1 or 2,
The thickness of the region of 50% or more of the surface area of the central shank is 0.8-2 mm,
The shank structure of the sole characterized by this. In claim 3,
The total thickness of the central shank is 0.8-2 mm,
The shank structure of the sole characterized by this. In any of claims 1 to 4,
The central shank has a shank groove extending in the front-rear direction.
The shank structure of the sole characterized by this. In any of claims 1 to 5,
On the bottom side of the midsole, a corrugated sheet having a corrugated shape is disposed at a position corresponding to the buttocks of the sole, and a central shank is integrally provided on the front end side of the corrugated sheet.
The shank structure of the sole characterized by this. In claim 1 or 2,
The overlap amount of the side shank with respect to the central shank is 4 mm or more.
The shank structure of the sole characterized by this. In claim 1,
The side shank is composed of a woven fabric, a knitted fabric, a nonwoven fabric, a film or a laminate thereof, or a woven fabric, a knitted fabric or a nonwoven fabric impregnated with a resin,
The shank structure of the sole characterized by this. In claim 1,
The midsole has a hardness of 40 to 65 in terms of C hardness of JIS K 7312 type.
The shank structure of the sole characterized by this.

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