JPH0311761B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement in a shoe sole in which a reinforcing member with excellent abrasion resistance is attached to a part of the sole main body made of natural or synthetic leather. It is something.

(Prior Art) Generally, leather shoes have the advantage of being breathable and conforming to the foot, and have a strong image of being a luxury product, but on the other hand, they have low contact friction with the ground, so they are easily worn out. Another drawback was that it was hard and could easily slip on smooth surfaces.

For this reason, as shown in FIGS. 12 and 13,
A reinforcing space b consisting of a through hole, a recessed part, or a partially cut out part is provided in a part of the sole main body a made of natural or synthetic leather that is easily worn.
After applying the adhesive e to the joint surfaces c and d of the reinforcing member, a reinforcing member made of a highly abrasion-resistant, soft and anti-slip material such as natural rubber, synthetic rubber, composite resin, or a mixture thereof is applied. As shown in FIGS. 12 and 14, a liquid urethane compound h1 that hardens to a hardness required for a shoe sole is injected and filled into the sole of the shoe into which the member f is fitted and bonded, and into the reinforcing space b, as shown in FIGS. 12 and 14. 15 to 1
As shown in FIG. 7, a shoe sole has been developed in which a reinforcing member f is disposed in a reinforcing space b, and a liquid urethane compound h2 is injected and filled between the joint surfaces thereof.

(Problem to be Solved by the Invention) However, when the reinforcing member f is simply fitted into the reinforcing space b of the bottom main body a and bonded, the outline shapes of the reinforcing space b and the reinforcing member f are Due to the mismatch, the gap between the bonding surfaces is not constant, and a wide gap and a narrow gap are formed, and the bonding surfaces in the narrow gap area are reliably bonded to each other, but the bonding surfaces in the wide gap area are not bonded. It begins to form a gap. In this way, it is not possible to compensate for the discrepancy in the surface shape of the adhesive surfaces with an extremely thin film of adhesive e, and the work becomes laborious and the adhesion is insufficient, and the adhesive e itself is hard and difficult to stretch. In addition, the adhesive edge area is small, so when the sole bends,
There is a drawback that the reinforcing member f may be peeled off from the bottom main body a because the concentrated unreasonable force applied to the adhesive portion of the end face cannot be sufficiently absorbed.

In addition, in the case where the reinforcing space b is injected and filled with the liquid urethane compound h1 which becomes the reinforcing member and cured to a predetermined hardness, there is no need to apply adhesive, so the bottom main body a and the reinforcing material Although it has the advantage of being easy to connect with other parts, the reinforcing member itself formed by injection filling is required to have enough hardness as the bottom member, which reduces elongation and requires a narrow joint end area. Because of this, when the sole is bent, it is not possible to absorb the excessive force that is concentrated on the joint, and therefore, as mentioned above,
There is a drawback that the reinforcing member may be peeled off from the bonded portion.

Furthermore, in the case where the reinforcing member f is arranged in the reinforcing space b and the liquid urethane compound h2 is injected and filled between the joint surfaces of the two, the bottom main body a and the reinforcing member f are
The reinforcing member f is placed in the reinforcing space b so that the two parts are bonded only by the liquid urethane compound h2, which has a weak bonding force, and the spaces in which the liquid urethane compound h2 is injected and filled are spaced at regular intervals. Since it is difficult to arrange the reinforcing member f, the width of the injection space is wide and narrow, and the reinforcing member f is arranged in the reinforcing space b formed by the through hole or the partial cutting of the end portion. When the compound h2 is injected and filled (see Fig. 16), only the joint area between the bottom main body a and the reinforcing member f becomes narrow, and the reinforcing member is placed in the reinforcing space b formed by the recessed part. f and inject and fill the liquid urethane compound h2 between the joint surfaces of both (see Fig. 17),
After the liquid urethane compound h2 is injected and filled along the bottom surface and the inner peripheral wall surface of the reinforcing space b, the reinforcing member f must be disposed, so that the bottom main body a and the reinforcing member f are Air bubbles are likely to form within the joints. For this reason, the bonding force between the sole main body a and the reinforcing member f becomes weak, and the excessive force applied to the adhesive part cannot be absorbed evenly. There is a drawback that the support member f is easily peeled off from the bottom main body a.

Focusing on these drawbacks, the present invention is easy to manufacture, ensures a tight connection between the bottom main body and the reinforcing member, and eliminates stress applied to the end surface joint between the bottom main body and the reinforcing member. It is an object of the present invention to provide a shoe sole that can absorb force evenly and reliably and has excellent durability without the reinforcing member being peeled off from the main body of the sole.

(Means for Solving the Problems) The sole of the present invention is reinforced by thinning the part that requires abrasion reinforcement and making the entire surface a bonding plane, or by cutting it out leaving a stepped bonding plane. Consisting of a bottom main body made of natural leather or synthetic leather with a space formed therein, and a reinforcing member with excellent wear resistance and slip resistance that is housed in the reinforcing space of the bottom main body and adhered to the adhesive plane, The reinforcing member and the bottom main body are connected to each other by forming an adhesive plane so that the stepped end face formed on the bottom main body and the end face of the reinforcing member face each other with a predetermined interval on the adhesive plane, and a groove of a predetermined width is formed. In the groove formed,
It is filled with an injection agent made of a liquid urethane compound with excellent elasticity and having liquid urethane prepolymer as its main component.

(Example) Next, an example of the present invention will be described in detail based on the drawings as follows.

Figures 1 to 4 show soles for sports shoes such as baseball, soccer, and golf shoes in which spike fittings are attached to the front treading part, and Figure 1 shows the front part of the sole main body 1 made of natural leather. An exploded plan view seen from the contact surface side when a reinforcing member 2 made of a urethane molded product is adhered to the periphery of the treading part. A plan view seen from the side, and FIG. 3 is an enlarged sectional view taken along the line A--A in FIG. 2.

This sole consists of a sole main body 1 made of natural leather, which has a reinforcing space 4 formed by thinning the peripheral edge of the front tread part and using the entire surface as an adhesive plane 3;
The reinforcing member 2 is made of a urethane molded product with excellent wear resistance and anti-slip properties and is placed in the reinforcing space 4 and bonded to the bonding plane 3 by pressure, and the reinforcing member 2 and the bottom main body 1 are By forming the bonding plane 3, the step end surface 5 formed on the bottom main body 1 and the end surface 6 of the reinforcing member 2 face each other on the bonding plane 3 with an interval of 1 to 2.5 mm so as to form a groove 7. adhesive 8
The groove 7 is pressed and bonded onto the adhesive plane 3 using
is filled with an injection agent 9 made of a liquid urethane compound having excellent elasticity and having liquid urethane prepolymer as its main component.

As the injection agent 9 made of the liquid urethane compound with excellent elasticity, for example, a mixture of the first liquid and the second liquid is used.

The first liquid contains 100% (weight ratio) of liquid urethane prepolymer and 30% to 30% plasticizer such as phthalate ester.
40, a paste-like coloring agent 1 to 2, such as a pigment kneaded with a plasticizer, and other compounding agents 3 to 5, such as ultrafine particle silica, and the second liquid is a liquid urethane prepolymer 100 ( (weight ratio), crosslinking agent such as 4,4'-methylene-bis(2-chloroaniline), which is an aromatic diamine.
6.5 to 11.5, crosslinking accelerators such as adipic acid and oleic acid about 0.2, tackifiers such as coumaron indene resins and rosin esters 5 to 30, acetone,
It is formulated with 10 to 20% of a solvent such as MEK.

The injection agent made of this liquid urethane compound has excellent adhesion, fluidity, and flowability, has a large amount of nonvolatile components, has little volume shrinkage, is high in strength, and has particularly excellent elasticity. Every corner of the groove 7 is securely brought into close contact with the groove forming wall surface without forming minute gaps.

FIG. 4 shows a modification of the embodiment described above, in which a thin adhesive plane 3 having a smaller outline than the outline of the bottom main body 1 is formed on the periphery of the front treading part of the bottom main body 1.
Similarly to the embodiment described above, the bottom main body 1 and the reinforcing member 2 are bonded so that the step end surface 5 formed on the bottom main body 1 and the end surface 6 of the reinforcing member 2 are at a predetermined position on the bonding plane 3 due to the formation of the bonding plane 3. are pressure-bonded using an adhesive 8 so as to form grooves 7 facing each other with an interval of
This groove 7 is filled with an injection agent 9 made of a liquid urethane compound with excellent elasticity.

In addition, Figures 5 to 8 mainly show men's shoes,
This is a sole for women's shoes, in which a reinforcing space 4 is formed by recessing the front tread portion of a sole main body 1 made of synthetic leather.

Fig. 5 is an exploded plan view seen from the ground contact side when a reinforcing member 2 made of urethane molding is adhered to the reinforcing space 4 formed in the front tread section, and Fig. 6 is an exploded plan view of the bottom main body 1. FIG. 7 is a sectional view taken along the line B-B in FIG. 6, and shows the depth of the reinforcing space 4. A reinforcing member 2 made of a urethane molded product having a thickness of Adhesive 8 is applied so that the end surfaces 6 of the reinforcing member 2 face each other at a predetermined interval on the adhesive plane 3 to form a groove 7.
The reinforcing space 4 is adhesively bonded to the adhesive plane 3 using the reinforcing space 4, and the groove 7 is filled with an injection agent 9 made of a liquid urethane compound having excellent elasticity and having liquid urethane prepolymer as its main component. ing.

FIG. 8 shows a modification of the embodiment shown in FIG. 5, in which a hole 10 is penetrated through the center of the bonding plane 3 of the reinforcing space 4 formed by recessing the front tread section. FIG.

Further, FIG. 9 is a plan view of another example of the sole used for general men's shoes or women's shoes, viewed from the ground contact side, and FIG. 10 is a sectional view taken along the line CC in FIG. 9. A reinforcing space 4 (not shown) having an adhesive plane 3 is formed between the toe portion F of the sole main body 1 and the heel main body 11 bonded to the heel portion G, and this reinforcing space 4
A reinforcing member 2 with excellent wear resistance and anti-slip properties is added to
The step end surface 5 formed on the bottom main body 1 by forming the bonding plane 3 of the reinforcing space 4 and the end surface 6 of the reinforcing member 2
are bonded using an adhesive 8 so as to form grooves 7 facing each other at a predetermined distance on the bonding plane 3, and a stretchable material mainly composed of liquid urethane prepolymer is attached to the formed grooves 7. The structure is filled with an injection agent 9 made of an excellent liquid urethane compound.

In the shoe sole of the present invention as described above, the reinforcing space 4 is formed by thinning the part that requires abrasion reinforcement so that the entire surface becomes the bonding plane 3, or by removing it leaving the stepped bonding plane 3. In addition to manufacturing the sole body 1 made of natural leather or synthetic leather,
After manufacturing a reinforcing member 2 that is housed in the reinforcing space 4 and being pressure-bonded to the bonding plane 3, and applying an adhesive 8 to at least the bonding plane 3, the reinforcing member 2 and the bottom main body 1 are bonded together. are polymerized and crimped, leaving a groove 7 of a certain width at the boundary, and if the formed groove 7 has an open end, both of the open ends are closed with a solid adhesive material that will be removed later, and the injection agent is removed. After making sure that the injection agent 9 does not flow out, the injection agent 9 is filled into the groove 7 from the tip of a thin nozzle of a syringe, and the injection agent 9 is cured.

In the above embodiment, the adhesive is applied only to the bonding surface of the bottom main body 1 and the reinforcing member 2, but as shown in FIG. Adhesives 8a, 8b, and 8c are also applied to the stepped end surface 5 of the bottom main body 1, the end surface 6 of the reinforcing member 2, and the adhesive plane 3 that forms the bottom of the groove 7, and the injection agent 9 filled in the groove 7 and the groove It is also possible to improve adhesion to the wall.

(Operations and Effects of the Invention) The sole of the present invention as described above can be reinforced by thinning the part that requires abrasion reinforcement and making the entire surface a bonding plane, or by cutting it out leaving a stepped bonding plane. Since the reinforcing member with excellent abrasion resistance is pressure-bonded to the adhesion plane of the bottom main body that forms the space, the bottom main body and the reinforcing member can be bonded reliably and strongly over a wide adhesive surface. By forming an adhesive plane, the step end face formed on the bottom main body and the end face of the reinforcing member are opposed to each other with a predetermined interval on the adhesive plane to form a groove of a predetermined width, and a liquid is applied to the formed groove. Because it is filled with an injectable agent made from a liquid urethane compound with excellent elasticity that is mainly composed of urethane prepolymer, the joint boundary between the bottom body and the reinforcing member is secure without forming minute gaps. In addition, the injection agent filled in the groove of a certain width evenly and sufficiently absorbs the excessive force that is concentrated on the joint when the sole is bent. This prevents the reinforcing member from peeling off from the bottom main body.

In manufacturing the sole of the present invention, the sole main body and the reinforcing member are manufactured, and after applying an adhesive to at least the adhesive plane, the reinforcing member and the sole main body are bonded with a groove of a constant width at the boundary between them. If an open end is formed in the formed groove by polymerization and pressure bonding while leaving a Since it is enough to fill the grooves and harden it, the soles can be easily manufactured without requiring any skill.

Therefore, according to the present invention, it is easy to manufacture, and
Moreover, the tight connection between the bottom main body and the reinforcing member is ensured, and the unreasonable force applied to the end surface joint between the bottom main body and the reinforcing member can be evenly and reliably absorbed, and the reinforcing member It is possible to provide a highly durable shoe sole that will not peel off.

[Brief explanation of the drawing]

Figure 1 is an exploded plan view from the ground contact side when a reinforcing member is glued to the periphery of the front treading part of the bottom main body;
Fig. 2 is a plan view of the bottom main body and the reinforcing member joined together as seen from the ground plane side, Fig. 3 is a sectional view taken along the line A-A in Fig. 1, and Fig. 4 is the embodiment described above. Fig. 5 is an exploded plan view as seen from the ground contact side when a reinforcing member is bonded to the reinforcing space formed in the front tread section, and Fig. 6 is a cross-sectional view showing a modification of the bottom main body. FIG. 7 is a sectional view taken along the line B-B in FIG. 6, and FIG. 8 is a modification of the embodiment shown in FIG. 5. FIG. 9 is a partially exploded plan view of the sole used for general men's or women's shoes, viewed from the contact surface side. FIG. 10 is a cross-sectional view taken along the line CC in FIG. 11
The figure is a cross-sectional view when the adhesive is also applied to the inner wall surface of the groove, Figures 12 to 17 show conventional examples, and Figure 12 is a plane view from the ground surface side showing an example of the sole of the shoe. Figure 13 is a cross-sectional view taken along the line D-D in Figure 12, Figure 14 is a cross-sectional view of a shoe sole in which a liquid urethane compound is injected and cured into the reinforcing space.
Fig. 15 is a plan view of a shoe sole seen from the ground contact side showing another conventional example, and Fig. 16 is an E in Fig. 15.
-E line sectional view and FIG. 17 are sectional views of a shoe sole in which a reinforcing member is disposed in a reinforcing space and a liquid urethane compound is injected and filled between the bonding surfaces of the two. DESCRIPTION OF SYMBOLS 1... Bottom main body, 2... Reinforcing member, 3... Adhesive plane, 4... Reinforcing space, 5... Step end surface, 6...
end face, 7... groove, 8... adhesive, 9... injection agent,
10...Hole, 11...Heel-based.

Claims (1)

[Claims] 1. A bottom main body made of natural leather or synthetic leather, in which a space for reinforcement is formed by thinning the part that requires abrasion reinforcement and making the entire surface an adhesive plane, or by removing it leaving a stepped adhesive plane; It consists of a reinforcing member with excellent abrasion resistance and anti-slip properties that is housed in the reinforcing space of the bottom main body and adhered to the adhesive plane, and this reinforcing member and the bottom main body are attached to the bottom main body by forming the adhesive plane. The formed step end face and the end face of the reinforcing member are pressure bonded so as to face each other at a predetermined distance on the bonding plane to form a groove, and a stretchable material mainly composed of liquid urethane prepolymer is applied to the groove. A shoe sole characterized by being filled with an injection agent made of a liquid urethane compound that has excellent properties.