JPH0335121Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Use) This invention relates to the structure of a shoe suitable for leather shoes, particularly casual shoes.

(Prior art) Shoes manufactured using the conventional firm ear welt type or sill welt type are made by cutting ribs into the stiff, low-flex midsole, or pasting another rib and temporarily fixing it to the shoe last. After hanging the upper leather, the upper leather and fine leather are sewn onto the midsole rib, and the grounding leather is sewn onto the fine leather or crimped with adhesive to finish the shoe. It's coming. Shoes obtained in this way are structurally strong, do not lose their shape, and have an excellent appearance, but on the other hand, they have low production efficiency, are heavy, and have poor flexibility and shock absorption when worn. There was a problem.

On the other hand, the upper material suspended in the shoe last is used instead of the upper mold, and the polyurethane foam stock solution is injected into the space for the ground sole formed by the side mold and the lower mold, and the polyurethane foam sole is directly formed. The foam bonding method is known in Japanese Patent Publication No. 45-3698. Polyurethane foam soles are lightweight and have excellent cushioning properties, but they lack shock absorption, or cushioning properties.In the case of shoes with thick polyurethane foam soles, such as casual shoes, the elasticity of the polyurethane actually affects walking performance. The problem was that it was a hindrance.

Furthermore, a technique for use in shock-absorbing foams for the middle soles of athletic shoes such as tennis shoes and soccer shoes is disclosed in Japanese Utility Model Application Publication No. 86109/1986. Generally, when using rubber or synthetic resin foam, the elasticity and shock absorption properties are achieved by the countless cells in the foam, but when it is integrally formed with the polyurethane foam liquid for forming the ground sole, the shock absorption properties are improved. When the foam is open-celled, there is a problem in that the polyurethane foaming stock solution penetrates into the cells of the shock-absorbing foam, changing its shock-absorbing performance.

On the other hand, if the impact absorbing foam is a closed cell or if the impact absorbing material is non-foam,
The polyurethane foam stock solution for forming the ground sole cannot reach the midsole because it is blocked at the interface with the shock absorber layer. The problem was that the force could not be utilized and extra man-hours were required to adhere the shock absorber to the inner sole using adhesive in advance.

(Problems to be solved by the invention) This invention does not change the shock absorption performance even if the polyurethane foam stock solution enters, has excellent cushioning properties and flexibility of the polyurethane foam sole, and has a high The aim is to provide shoes with a structure that combines good adhesion and good walking performance.

(Means for solving the problem) This idea fixes the futsu core with a gap between it and the inner peripheral edge of the rib, and applies a mixture of lightweight elastic particles such as cork grains and adhesive to the rib. Temporarily spread the polyurethane foam concentrate to specific areas such as the entire area on the contact surface of the insole, the treading area and the heel, or only the treading area, with a thickness approximating the height of . Then, in order to form a ground-contact sole, the polyurethane foaming stock solution is injected into the contact surface of the insole and foamed.The polyurethane foaming stock solution penetrates into the gaps between the particles of lightweight elastic material such as cork, forming the insole. It reaches the ground surface and firmly adheres to the insole and cork particles, and since it is difficult for the polyurethane foaming solution to penetrate into the structure of the cork particles themselves, the impact absorption properties of lightweight elastic particles such as cork are improved. With almost no changes, we were able to create a shoe with a structure that combines the excellent cushioning, flexibility, and adhesive properties of the polyurethane foam sole with the walking stability provided by the shock absorption properties of the lightweight elastic particles themselves.

(Example) An explanation will be given based on drawings showing an example of the configuration of this invention.

Fig. 1 is a perspective view showing a partially cutaway cross-section of the tread part of the shoe of this invention, Fig. 2 is an enlarged sectional view of the tread part, and Fig. 3 is an enlarged sectional view of the foot part. It is.

In the figure, 1 is the upper, and in this example, the upper 1
0 and the back leather 11 are laminated, but the upper leather 1
A single layer of only 0 may be used. The material used for the upper 1 may be not only natural leather but also artificial or synthetic leather or canvas.

The upper material used in the shoes of this invention is preferably one obtained by the ear welt method, sill welt method, or step down method described in JIS S5050-1984. 2 is the insole, and any known material can be used as long as it has flexibility, such as leather insole, leather board, fiberboard, nonwoven fabric, etc.
Between the insole 2 and the ground-contacting sole 3, a lightweight elastic material is applied to the entire lower surface side of the insole, the treading part and the heel part, or each required part of the treading part, with a thickness that is approximately the same as the height of the rib 9. The surfaces of the body particles are coated with adhesive and the adhered particles are roughly arranged temporarily and the foaming polyurethane compounded solution of the ground sole is penetrated to integrate the adhesive-coated particles with the foam to form a shock absorbing layer. It forms the SAL. Semi-hard urethane foam particles, cork particles, etc. can be used as lightweight elastic particles for use in the shock absorbing layer SAL formed on the lower surface of the midsole 2, but cork particles are most suitable.

As mentioned above, the formation of this shock absorbing layer involves firstly
In order to temporarily place the particles on the lower surface of the insole 2, the cork particles are coated with adhesive and adhered to the surface, and the particles are temporarily placed so that the foamable polyurethane compound solution on the ground sole can penetrate. However, cork is crushed into coarse particles with a diameter of about 0.5 to 3 mm.
The surface of the particles is coated with an adhesive selected from known adhesives such as urethane adhesive, vinyl adhesive, or rubber adhesive. For example, it is appropriate to use a mixture of 100 parts of cork particles and 10 to 20 parts of adhesive in terms of volume ratio, but the particles in the temporary arrangement mentioned above do not allow the foaming polyurethane compound concentrate to penetrate when forming the ground-contact bottom. Since the adhesive is strongly bonded by the adhesive, the mixing ratio of the adhesive can be further reduced as long as the cork particles do not fall off during temporary fixing.

In other words, the temporary arrangement of the lightweight elastic particles is arranged so that the foaming polyurethane compound stock solution injected when forming the in-ground sole can penetrate, and the foaming polyurethane for forming the in-ground sole during the forming of the in-ground sole. It is constructed so that the compounded stock solution can enter and form a strong adhesive state with the inner sole 2. No. 4 is a lightweight elastic particle prepared by mixing lightweight elastic particles and an adhesive and coating the particle surface with the adhesive. 5 is a stitching thread that fixes the upper 1 to the rib 9 and the thin leather 6;
8 is the edge, and 7 is a protruding sewing thread for sewing the edge 8 to the thin leather 6.

In the enlarged cross-sectional view of the foot of the shoe in Figure 3, the foot of the shoe is constructed such that a rigid foot core 12 supported by foam stably supports the foot of the foot with a good feel. However, in the illustrated example, lightweight elastic particles 4 coated with a more preferable adhesive are arranged in a composite manner outside the rigid foam core 12 to form a shock absorbing layer.
This is what makes up SAL. The rigid foot core 12 is not particularly limited, but has a width or length that can form at least a distance between the inner circumferential edge of the rib 9 and the foaming polyurethane compound liquid necessary for the flow of the foaming polyurethane compound liquid to the lower surface side of the insole when attached. It may be made of metal or plastic as long as it is of the same type. In addition, when temporarily fixing the rigid fuzu core 12, the insole is not entirely bonded to the insole, but is locally attached to the insole at intervals by nailing or other methods. When forming the grounded sole, it is necessary for the raw solution to flow around to the lower surface of the midsole and adhere to the entire surface with the foam. In theory, the outer surface of the rigid foam core 12 is treated with an adhesive suitable for each material. Other materials such as the ribs 9 and the thin leather 6 are not particularly limited, and any conventionally known materials can be used. Further, if necessary, a heel block made of wood fiberboard or the like can be attached to the heel.

The upper material obtained as described above is inserted into the last forming the ground sole, and the ground sole is foam-molded using a known foaming polyurethane compound by a known injection molding method or open molding method.
The desired shoe can be obtained by cutting so that the outer peripheral shape of the edge matches the ground-contacting sole.

(Operations and Effects of the Invention) Since the invention is constructed as described above, it has the following effects.

A shock absorbing layer made of lightweight elastic particles strongly bonded with foam is set between the midsole and the foam ground sole, providing excellent shock absorption and suitable bottom walking properties. .

The rigid foot core is placed at the foot with a gap between it and the bottom surface of the insole, so it is bonded to the inside sole using strong foam, increasing durability and stability. You can get a feeling of walking.

The outer surfaces of lightweight elastic particles such as cork particles are coated with a thin layer of urethane adhesive and bonded to each other. It does not impregnate into the elastic particles such as cork, and therefore does not impair the cushioning properties of the elastic particles themselves, resulting in a synergistic effect between the elasticity of polyurethane foam and the excellent cushioning properties of cork particles. Therefore, it was possible to exhibit extremely good walking stability. In particular, the effect was sufficiently obtained even in the case of casual shoes with a thick sole of about 20 mm.

In the foot part, between the rigid foot core and the insole,
The foaming polyurethane mixture enters the lower surface of the insole and foams and hardens by creating a gap and sticking locally, providing an excellent feel on the foot and creating a strong bond with the shock absorbing layer of elastic particles. The combination provides extremely good walking stability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a partially cutaway cross-section of the tread part of the shoe of this invention, Fig. 2 is an enlarged sectional view of the tread part, and Fig. 3 is an enlarged sectional view of the foot part. be. 1 ... Upper cover, 2... Middle sole, 3... Ground sole, 4...
...Lightweight elastic particles with adhesive coating on the particle surface,
5...Dip sewing thread, 6...Fine leather, 7...Output sewing thread, 8...Edge, 9...Rib, 10...Upper leather, 1
1...Leather lining.

Claims (1)

[Scope of utility model registration request] A rib is provided on the flexible insole, and on the underside of the insole made of upper material, which is made by sewing upper leather and fine leather to the rib to form an edge, there is a rib at the height of the rib between the inner peripheral edge of the rib The surfaces of lightweight elastic particles are coated with adhesive and adhered to the entire lower surface side of the insole, the stepping part and the heel part, or the required parts of the stepping part to an approximate thickness. The foaming polyurethane compound solution is temporarily arranged in a roughness that allows it to penetrate, and on the lower surface side of the midsole at the foot, lightweight elastic particles and/or the lower surface of the midsole are temporarily secured in the same manner as above. Adhesive-coated rigid foot cores are arranged with gaps between them, and when forming the ground sole, a foaming polyurethane compounded solution penetrates into the lower surface of the entire midsole at the same time as the ground sole is formed, creating a strong adhesive state. Shoes characterized by a structure with a rigid foot core and a shock absorbing layer.