JPH0998804A - Insole of shoes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide shoes of a good wearing feeling by improving the bending characteristic of pressed part of a multi-layered bottom, thereby reducing fatigue over a long time use. SOLUTION: A proper number of rectangular punched out holes 3 or three triangular grooves 4 are formed on the part of multi-layered insole to be pressed 1 by foot in hand-made or projection molded shoes. The central groove 5 has an insosceles triangular form and the grooves 6 on both sides has each a right- angled triangular form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove for an insole used for a multi-layered sole, which improves the flexibility of the shoe sole and further promotes the reduction of fatigue during walking.

[0002]

2. Description of the Related Art Various methods have been tried to improve the flexibility of the stepped portion of the shoe sole. In shoes that are commonly worn, those with a cut groove or punched hole in the stepped portion (bent portion) of a hard insole such as a pressboard, and an insole sponge attached to the upper surface thereof, Or thick EV
In the insole of A sponge etc., several compression grooves are formed on the stepped part (bent part) at the time of compression molding, or another material with different hardness is used for the stepped part (bent part). It is buried. In addition, there is also one in which several easily bendable grooves are provided on the ground surface side of the rubber bottom, which serves as the ground contact bottom, also as a design, as in Design Registration No. 803520.

The technique described above is also used in sports shoes, but in sports shoes, in order to prevent slippage in particular, a rubber sole serving as a ground contact sole is provided with an uneven groove for design purposes. . For competitions that are played outdoors, the grooves are deeply formed, whereas for competitions that are indoor, relatively shallow flat grooves are formed so as to adhere well to the floor.

[0004]

The method of forming a cut groove or a punched hole in a press board described in the prior art is a simple method, but the press board has an insole function and sponge. Since the bottom and the outer bottom are laminated, the flexibility is unexpectedly poor and the effect is thin. Also, in the case of a groove provided on the inner bottom of a thick EVA sponge, etc., since the groove is a rectangular compression groove instead of punching, there is some flexibility, but the compression ratio of the lower part of the groove during compression molding. Higher and harder hinder flexibility.

Next, the method of inserting a material having a soft hardness into the stepped portion increases the number of steps for forming the multi-layered bottom, which causes a labor cost and is often a factor in increasing the cost. It is rarely used for low-priced products. The method of providing a groove that also serves as a design on the stepped portion of the rubber bottom, which is the outer bottom, has sufficient flexibility as an effect, but there are restrictions on the design and the deepness of the groove reduces the flexibility. Better, this part may crack and break from it during wear. Especially intense sports,
Even if it is not so, it is not suitable for general wear that has a lot of movement. Therefore, the present invention has been made to solve these problems.

[0006]

Therefore, according to the present invention, when forming a multi-layer bottom, the stepped portion of the insole is provided with several punched holes or three grooves at substantially right angles to the longitudinal direction, The central groove of the three grooves has an isosceles triangular cross-sectional shape, and the cross-sectional shapes of both side grooves have a right-angled triangular shape to make the bending of the stepped portion smoother and to flexibly respond to walking movements. The present invention provides a shoe having the above structure.

[0007]

[Function] The cross section of the three grooves provided in the middle bottom of the multi-layered bottom is characterized by an isosceles triangle in the center and a right triangle in cross section on both sides. Like the compression groove, since the compression ratio of the lower part of the groove at the time of compression molding is high and the hardness is not increased, it is easy to bend to the upper surface side of the insole, that is, the foot contact side.

[0008]

An embodiment of the present invention will be described with reference to the drawings. The present invention has three implementations, which will be described. In the step part (2) of the insole (1) of the multi-layered bottom (7),
A punched hole (3) (see (a) in FIG. 1). A multi-layered bottom (7) with a stepped portion (2) of the insole (1) provided with a triangular groove (4). (See (b) in FIG. 1). The injection grooved shoe (1) has a stepped portion (2) provided with a triangular groove (4) (see FIG. 3). First, as the first embodiment, the insole (4) provided with the punched hole (3) is used. When the pressboard is cut into the shoe bottom shape, the stepped portion (2) is cut from the periphery of the bottom shape. Leave 10 to 15 cm (depending on the size), and make three punched holes (3) so that they are substantially orthogonal to the longitudinal direction.
At the same time, the punching pressboard insole (8) is molded.
The punching holes (3) have a pitch of 14 mm and a groove width of 4 mm.

Furthermore, an EVA sponge having a thickness of 8 mm was cut and processed in the same manner as the above-mentioned pressboard insole (8) to obtain an EV.
The middle bottom (1) of the A sponge is molded, and the outer bottom (9), which is a designed outer bottom molded in a separate step, and the middle bottom (1) of the EVA sponge are attached with an adhesive. Temporarily attach the above pressboard insole (8) to the bottom of the shoe mold that has the instep (10) cut and sewn in a separate process, and use the suspender (tow raster, heel raster) to cover the instep (10). Suspend the lower edge. After that, the EVA sponge is bonded to the bottom with the inner sole (1) and the outer sole (9) attached to form a shoe.

The following example is the same as the method described above in that an EVA sponge having a thickness of 8 mm is cut into the shape of the bottom of a shoe, but the EVA sponge in which the stepped portion (2) is not perforated is used. Mold the bottom (1). Insert and attach the inner bottom (1) of the EVA sponge to the lower mold (13) of the mold (14) consisting of the upper mold (12) and the lower mold (13), and compress and heat the upper mold (12). I will remove the mold later. At that time, the thickness is compressed to a thickness of 6 mm, and at the same time, the triangular groove (4) is formed. In the molding method, the upper die (12) is provided with triangular protrusions (15) (see FIG. 2). Naturally, the position of the triangular protrusion (15) is the stepped portion (2) of the insole (1), and the circumference is 10 to 15 mm.
This is the position that leaves (depending on the size).

There are three triangular protrusions (15), and the central triangular protrusion (15) is an isosceles triangle having a vertex height of 5 mm and a base of 4 mm. The front and rear triangular projections (15) are right-angled triangles having an outer root at a right angle, a height of 5 mm, and a bottom of 4 mm with respect to the central triangular projection (15). The pitch for applying these triangular protrusions (15) is 16 mm (see FIG. 2). Subsequent molding of the shoe is the same as described above.

Although the above-mentioned embodiment is a handmade type molded shoe, as a third embodiment, a triangular groove (4) is also formed on the sole of the injection molded shoe. The embodiment will be described. Around the bottom step (2) of the last mold (11) of the injection molding die
Leave 0 to 15 mm (depending on the size) and leave the mold (1
4) Make the same triangular protrusion (15) as the protrusion made on the upper mold (12).

A last mold (11) having a shoe upper (17) in which the insole (10) is sewn with an insole cloth (16), and the shoe upper (17) is attached to the last mold (11) By assembling each mold of the side mold (18), the outer bottom (9) formed by the dummy last mold, or the sole mold (19) on which the outer bottom (9) formed by another process is placed. The resin of the insole material is injected into the created void and the shoe upper (17)
The insole (1) is molded integrally with the above to obtain a multilayer bottom (see FIG. 3). In this embodiment, urethane foam is used as the sole material, but foamed PVC, foamed thermoplastic resin, or the like may be used.

[0014]

[Effect] The conventional insole such as thick EVA sponge has a rectangular compression groove, and the compression ratio of the lower part of the groove is high at the time of compression molding so that it becomes hard and resistance is not obtained, and the flexibility is not good. The compressibility of the lower part of the groove is high and it becomes hard, which causes resistance and distortion. In the present invention, since punching holes are provided, there is no resistance to bending and the bending property is good. In addition, the cross-sectional shape of the three triangular grooves is an isosceles triangle in the center and right-angled triangles on both sides, so that the compression rate is not high and hard unlike a rectangular compression groove. When bending, it is easy to bend to the upper surface side of the insole, that is, the foot contact side, when bending, no force acts on the bottom side of the groove, it easily adapts even to strong bending, and the apex of the triangular groove Does not cause bending distortion and has good flexibility (see Fig. 4).

Further, in the case of injection molding, a gas (20) cannot be accumulated in a square like a square groove (see FIG. 5), and a tight triangular groove can be formed. By turning it over, it is possible to obtain the desired flexibility. In addition, cost increase by inserting a soft dissimilar material described in the section of means for solving the problem, design restriction by providing a groove that also serves as a design on the ground side,
Without worrying about cracks or the like due to bending, fatigue can be reduced by improving flexibility, and a shoe sole that is extremely comfortable to wear can be obtained.

[Brief description of drawings]

FIG. 1A is a central partial cross-sectional view of a multilayer bottom having a rectangular hole. (B) A central cross-sectional view of a multilayer bottom having a triangular shape.

FIG. 2C is a plan view of an upper die (die) having triangular protrusions. (D) (c) A arrow view.

FIG. 3 is a view of injection molding using a last mold having triangular protrusions.

FIG. 4 is a bent partial view of a multilayer bottom having a triangular groove.

FIG. 5 is a diagram in which gas is accumulated in a square groove.

[Explanation of symbols]

 1 Midsole 2 Stepped part 3 Stamped hole 4 Triangular groove 5 Center groove 6 Side groove 7 Multilayer bottom 8 Breathboard Midsole 9 Outsole 10 Outer cover 11 Last mold 12 Upper mold 13 Lower mold 14 Mold 15 Triangular protrusion 16 Insole cloth 17 Shoe cover 18 Side mold 19 Sole mold 20 Gas

Claims (3)

[Claims] 1. When forming a multi-layered sole (7) of a shoe, a plurality of punched holes (3) or foot pads are formed in the stepped portion (2) of the insole (1) substantially at right angles to the longitudinal direction. An insole (1) for a shoe, characterized in that it is provided with three triangular grooves (4) on its side. 2. A punching hole (3) characterized in that the shape of several punching holes (3) set forth in claim 1 is rectangular. 3. The cross-sectional shapes of the central groove (5) and both side grooves (6) of the three triangular grooves (4) described in claim 1 are an isosceles triangle and a right triangle, respectively. Triangular groove (4) characterized by having done.