JPH0321162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a method for manufacturing shoe soles, and the present invention relates to improvements in the manufacturing method of shoe soles, and mainly improves the tread area of the sole, such as the toe area, front tread area, or To provide a shoe sole whose heel side, at least two of these sides, or all of these sides are wear-resistant and have anti-punch properties.

<Prior Art> In order to improve the conventional shoe soles made only of leather, reinforcing materials made of the rubber, synthetic resin, or a mixture thereof are provided in the through holes in areas of the shoe soles that are prone to wear and tear. Shoe soles, etc., were provided by fitting and bonding.

<Problems to be Solved by the Invention> However, the method for manufacturing the shoe sole described above involves applying an adhesive or the like in advance to the through holes or recesses provided at predetermined portions of the leather sole; Similarly, the filling parts coated with adhesive are fitted and fixed, and this fitting adhesive method is laborious, resulting in insufficient adhesion and time-consuming work, as well as damage to the areas where the adhesive has been applied. This contaminates the surrounding area, significantly reducing the commercial value of the product (shoes), and when the sole of the shoe bends as the wearer walks or runs due to insufficient adhesion, the filling component and the sole may There were defects such as peeling and gaps, which made it easy for the filled parts to fall off.

<Means for Solving the Problems> In order to overcome the above-mentioned conventional shoe sole manufacturing method and the defects of the sole, the manufacturing method of the present invention is based on the steps of the treading area, which are the areas that are prone to wear and tear in the main body of the sole. It is intended to maintain the above-mentioned function of the sole for a long time by tightly adhering a molded product of highly abrasion-resistant polyurethane rubber to the sole of the shoe.
A molded product made by injecting highly abrasion-resistant liquid polyurethane rubber, etc. into the notches formed on both side edges from the rear end of the heel or the tip of the nail to the non-step side, and the notch in the main part of the shoe sole. The cut end surface and the cloth are closely connected together.

<Example> As shown in FIGS. 1 to 3, the method for manufacturing a shoe sole of the present invention involves cutting a natural leather material or an artificial leather material, which is a normal shoe sole material, into a sole shape,
Furthermore, for example, only on the tip of the nail as shown in FIG. 1, only on the rear edge of the heel as shown in FIG. 1, and on both sides from the tip of the nail to the non-step side as shown in FIG. The main body 1 of the sole having a notch 2 is formed by removing parts that are easily abraded, such as the end edges or, as shown in FIG. 1, the tip of the nail and the rear edge of the heel. On the other hand, as shown in FIGS. 2 and 2, a concave mold B is formed which has a flat bottom shape and is provided with a through hole or a concavity 5 that opens toward the upper surface 6 and has a depth equivalent to the thickness of the bottom. Next, the sole main body 1 is inserted into the recess 5 of the recess B, and a liquid polyurethane rubber having high abrasion resistance or an equivalent material is filled in the cavity corresponding to the notch 2 in the recess 5 of the recess B. A liquid rubber-like elastic material is injected and filled, and the filled part 3 made of polyurethane rubber reacts to form an arbitrary thin and strong piece 4 after hardening and molding (or before hardening and molding).
After that, the corresponding piece 4 is tightly bonded on the inner surface of the main part of the sole so as to cover the filling parts such as polyurethane rubber, thereby producing shoes as shown in FIGS. 3 to 5. Sole A can be manufactured. At this time, the cloth 4 may be a thin sheet-like non-woven fabric, leather, woven or knitted fabric, polyurethane or synthetic resin sheet or film. Further, the recess B may be a molded product of silicone resin or the like that does not easily adhere to the liquid polyurethane rubber or the like, or a molded product in which a silicone resin skin is formed on the wall surface of the recess 5.

<Effects of the present invention> The method for manufacturing the sole A of the present invention is to insert a durable material, which is a regular sole member, into a through hole etc. provided in a predetermined part of the sole main body of the sole A made of ordinary natural leather or the like. Unlike the fitting parts of molded products made of natural rubber, synthetic rubber, synthetic resin, or mixtures of these materials, which are highly abrasion-resistant and anti-slip, and are fitted and connected through adhesives, etc., the fitting members have good wear resistance. Since the liquid polyurethane rubber or the like is simply injected and filled, the production equipment is simple and the operation is simple, resulting in low production costs. In addition, the sole A manufactured by the manufacturing method of the present invention has a second
As shown in the figures and the like, liquid polyurethane rubber or the like is injected and filled into the cavity corresponding to the notch 2 of the sole main body 1, and after reaction hardening molding, the filled part 3 of the polyurethane rubber etc., the sole main body 1, and these are formed. The bonding surface 8 and the sole A may be damaged if the filler component 3 such as polyurethane rubber peels off from the bonding surface 8 of the main body 1 of the sole, or if dirt or the like enters the bonding surface 8, causing cracks or damage in that area. There is no risk of damage, and wear resistance can be maintained for a long time.

<Another embodiment> In addition to the sole A of the basic embodiment described above, as shown in FIGS. 4 and 5, the sole main body 1 of the sole A is
A shoe sole A is manufactured by coating and impregnating the piece 4 that is in contact with the inner surface side with a solution 8 of a polyurethane resin that becomes super hard or a synthetic resin having the same effect, and hardening and molding the piece 4. can do. Further, it is even better if the joining surface 8 between the sole main body 1 and the filling part 3 is formed into a stepped shape as shown in FIG. 5 for joining.

Therefore, the sole A of this embodiment is made by hardening the cloth 4, so that when the contact surface side of the sole A comes into contact with the ground, etc., the filling part 3 formed by the convex portion of the ground is hardened.
Not only is it possible to block uplifting impact on the sole body 1, but also it is possible to further strengthen the connection between the sole main body 1, the filler part 3 such as polyurethane rubber, and the contact piece 4.

[Brief explanation of drawings]

FIG. 1 to FIG. 1 are schematic plan views of a shoe sole, which is one of the main components related to the shoe sole manufacturing method of the present invention. FIG. 2 is a schematic diagram showing a state in which the main body of the sole is inserted into a concave mold used for manufacturing the same, in which is a schematic plan view as seen from the upper surface side, and is a schematic cross-sectional diagram along the - line. It is. FIGS. 3 to 3 are schematic vertical cross-sectional views of shoe soles according to basic embodiments manufactured by the manufacturing method of the present invention. FIG. 4 is a schematic longitudinal cross-sectional view of another embodiment of the shoe sole. FIG. 5 and FIG. 5 are partially enlarged cross-sectional diagrams illustrating the connection state of the main body of the sole, the filling parts, the contact piece, etc. in the sole. <Drawing code>, A...Sole, B...Concave, 1
... Sole main body, 2 ... Notch part, 3 ... Filling parts,
4... Piece, 5... Recess, 6... Upper surface, 8... Bonding surface, 7... Hard synthetic resin solution, etc.

Claims (1)

[Scope of Claims] 1. Cutting natural leather or artificial leather as a normal sole material into the shape of a shoe sole, mainly extending from the toe edge, heel rear edge, or toe tip edge to the unstepped edge. A sole main body having a notch formed by cutting both end sides or these two sides is inserted into a concave recess having a bottom-shaped recess that opens toward the upper side. A liquid polyurethane rubber having good abrasion resistance or a liquid rubber-like elastic material having the same effect is injected into the cavity corresponding to the notch of the main body of the sole in the concave recess and is cured. An arbitrary thin and strong piece is bonded via adhesive to the inner surface of the main part of the sole so as to cover the filling part such as polyurethane rubber, and the cut surface of the through hole of the main part of the sole is filled with polyurethane rubber. A method for manufacturing a shoe sole, characterized in that the parts, the cloth, and the main body of the sole are integrally formed in close contact with each other. 2. The method of manufacturing a shoe sole according to claim 1, wherein the notch on the side of the nail tip of the main body of the shoe sole is formed slightly inward. 3. The method of manufacturing a shoe sole according to claim 1, wherein the notch at the rear end of the heel of the sole is formed slightly outward. 4. The above-mentioned cloth is formed by coating and soaking a solution of an ultra-hard polyurethane resin or a solution of a hard synthetic resin having the same effect on the cloth to form a molded product. The method for manufacturing a shoe sole according to item 1.