JPH0734763B2 - Injection molding spike shoe sole molding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a shoe sole of a spike shoe in which a shoe sole having a spike pin embedded therein is injection-molded on the back surface of the shoe body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, the injection molding spike shoes of this type are first molded with an inner bottom surface 10 of a mold 100.
Spike pin is received in the spike pin receiving hole 102, which is recessed in 1.
Arrange the desired number of 200 ...
It is injected inside to integrally mold the shoe sole 300 on the back surface of the shoe main body 400, and the spike pin 200 inserts the pin portion 201 into the receiving hole 102, and the flange portion 202 and the inner bottom surface.
Although a space 500 is provided between the mold 101 and the resin, that is, the flange portion 202 is set in the mold 100 in a state of floating from the inner bottom surface 101,
Flange portion 202 due to resin pressure and flow during injection molding
Is pushed up and lifted up, and spike pin 200
Because there was a problem that it did not fit in the predetermined position,
Each of the spike pins 200 has a back surface 203 to which a pin-retaining chip 600 is individually adhered and set to solve the above-mentioned problem.

[0003]

However, in the above-mentioned conventional molding method, not only is it troublesome to attach and process the chips 600 to each of the spike pins 200, which is troublesome and the work efficiency is high. There was room for improvement because it caused a decline.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to easily and efficiently perform spike injection at the time of injection molding of shoe soles by omitting the work of processing each spike pin. An object of the present invention is to provide a method for molding the sole of an injection-molded spiked shoe that can prevent the pin from rising.

[0005]

In order to achieve the above object, a method of molding a shoe sole according to the present invention is to set spike pins in a plurality of spike pin receiving holes provided on the inner bottom surface of the mold, and A pressing plate made of a synthetic resin having a size extending over the back surfaces of the plurality of spike pins set above and having a ridge surface projecting to a position corresponding to the back surfaces of the plurality of spike pins, and a back surface of the plurality of spike pins. Then, the back surface of the shoe body is brought into contact with the pressing plate to bring the plurality of ridge surfaces into contact with the back surfaces of the spike pins, and then a predetermined synthetic resin material is placed in the mold. It is characterized in that the shoe soles are integrally molded by injecting into.

[0006]

According to the above-mentioned technical means, it is necessary to carry out the work of mounting the chips one by one on the back surface of each spike pin or mounting each of the spike pins on the restraining plate one by one. Instead, it is possible to prevent the spike pins from rising during injection molding of the shoe sole by pressing the spike pins together by interposing a restraint plate between the back of the spike pins and the back of the shoe body. become. Further, the shoe sole is generally formed with a thin toe side and a thick heel side, but if the press plate is made of a soft synthetic resin, the convex of the press plate arranged on the toe side of the shoe sole is convex. The surface is
It is compressed by the pressing force of the molding die that suspends the shoe body, and the height corresponds to the wall thickness on the toe side of the shoe sole. Therefore, if one kind of restraint plate whose height of the convex line corresponds to the thickness of the heel side of the shoe sole is prepared, it is possible to deal with various shoe soles. Furthermore, if the restraining plate is made of a synthetic resin that is lighter and softer than the synthetic resin for molding the shoe sole, the shoe sole becomes lighter as much as the restraining plate is provided, and a predetermined cushioning property can be obtained.

[0007]

EXAMPLE An example of the method of molding a shoe sole according to the present invention will be described below. In general, the setting of spike pins 2 ... In the mold B, the mounting of the restraining plate 3, the disposition of the shoe body 1, the sole of the shoe. It is material injection.

That is, first, in the plurality of spike pin receiving holes 5 formed on the inner bottom surface b of the desired mold B,
Conventionally known spike pins 2 ... Composed of a pin portion 2a and a flange portion 2b are set respectively, and then a restraining plate 3'is extended over the respective flange portion rear surfaces 2c of the plurality of spike pins 2 ... , 3 "respectively, and then the back surface 1a is brought into contact with the restraining plates 3 ', 3" to dispose the shoe body 1 of a known shape on the mold B, and then to the desired shoe sole. A material (urethane resin or the like) 6 is injected into the mold B to integrally mold the shoe sole 4 in which the spike pins 2 are embedded (see FIGS. 1 (a) (b) (c) (d) (e)).

In the illustrated example, the pressing plate 3 has a T-shaped cross section consisting of a flat surface 3a and a ridged surface 3b, and is formed in an elongated shape of a U-shaped plane. Side restraining plate 3'and heel side restraining plate 3 "are divided into a plurality of spike pins 2 located on the respective restraining plates 3 ', 3" to cover the entire flange portion rear surface 2c. The flat surface 3a is brought into contact with the back surface 1a of the shoe body 1 and the convex surface 3b is brought into contact with the flange portion back surface 2c of the spike pin 2 so as to be interposed between the shoe body 1 and the spike pin 2. .

Further, the pressing plate 3 melts at a temperature lower than a desired melting temperature of the shoe sole material 6 injected into the mold B (for example, about 130 ° C. in the case of urethane resin) and the spike shoe A
After molding, do you use a desired material that does not leave its original shape,
Alternatively, the original shape of the restraining plate 3 may be left without being melted even after molding, but the restraining plate 3 is made of the same material (urethane resin) as the above sole material 6 because of its melt adhesion. And, as a result, no foreign matter is left in the shoe sole 4, which is preferable because there is no fear of adversely affecting the heel of the user (therefore, FIG. 1 (e)).
As shown in).

The restraining plates 3'and 3 "are only one embodiment and are not limited in any way. For example, the restraining plates 3'and 3" may be constructed as another embodiment shown in FIGS. 4 and 5, and FIG. 4 is a shoe. A protrusion 3b 'is also provided on the side in contact with the back surface 1a of the main body, and FIG. 5 shows the protrusions 3c corresponding to each spike pin 2 ...
Is provided to form a convex strip surface. Further, although not shown, a flat plate shape covering the spike pins 2 in the width direction, or a shape in which all of the arranged spike pins 2 can be covered by one restraining plate may be arbitrarily selected.

Therefore, as described above, each restraining plate 3 ', 3 "
Since the spike pins 2 are pressed against the spike pin receiving holes 5 ..., there is no fear that the spike pins 2 ...

[0013]

According to the shoe sole molding method of the present invention, a plurality of spike pins can be pressed together by a plurality of ridges provided on the restraining plate. Therefore, a plurality of chips set on the inner bottom surface of the mold can be processed without the trouble of mounting the chips one by one on the back surface of each spike pin or processing each spike pin on the holding plate one by one. By simply mounting the restraining plate so that it extends over the back surface of the spike pin, the spike pin can be prevented from rising during injection molding of the shoe sole, and the efficiency of the shoe sole molding operation can be greatly improved. Moreover, by using a restraining plate having an extremely simple structure made of a synthetic resin, which has a size extending over the back surfaces of the plurality of spike pins set as described above and having a ridge surface protruding at a position corresponding to the back surfaces of the plurality of spike pins. Since the above-mentioned effects can be obtained, reduction in manufacturing cost can be expected.

Further, the shoe sole is generally formed with a thin wall on the toe side and with a thick wall on the heel side. However, if the press plate is made of a soft synthetic resin, the press plate placed on the toe side of the shoe sole is suppressed. The ridge surface is compressed by the pressing force when the shoe body is suspended in the mold, and has a height corresponding to the wall thickness on the toe side of the shoe sole. Therefore, if one kind of restraint plate whose height of the convex line corresponds to the thickness of the heel side of the shoe sole is prepared, it is possible to deal with various shoe soles, and it is more effective to reduce the above manufacturing cost. Can be In addition, the restraint plate is made of a synthetic resin that is lighter and softer than the synthetic resin for molding the shoe sole. For example, in the case where the shoe sole is made of urethane resin, the restrainer plate can be made of urethane foam or EVA. Therefore, many effects can be expected, such as the sole being lighter by the amount provided with the restraining plate and having a predetermined cushioning property.

[Brief description of drawings]

FIG. 1 is a drawing showing an embodiment of the molding method of the present invention, (a)
Is a cross-sectional view showing a state where spike pins are set in the mold, (b) is a cross-sectional view showing a state in which a restraining plate is placed over a plurality of spike pins, and (c) is a shoe body placed on the mold. FIG. 6 is a cross-sectional view showing a state, (d) is a cross-sectional view showing a state in which a shoe sole material is injected into a mold, and (e) is a cross-sectional view showing a state in which the holding plate is melted and integrated with the shoe sole.

FIG. 2 is a bottom view showing a state where a holding plate is interposed between the back surface of the shoe body and the spike pin.

FIG. 3 is a partially enlarged perspective view showing an example of a pressing plate.

FIG. 4 is a partially enlarged perspective view of a part of another embodiment of the pressing plate.

FIG. 5 is a partially enlarged perspective view showing a part of another embodiment of the pressing plate.

FIG. 6 is a partially omitted vertical front view showing a conventional example.

[Explanation of symbols]

 1: shoe body 1a: shoe body back surface 2: spike pin 2c: back surface 3: restraining plate 4: shoe sole B: mold

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29D 31/50

Claims (1)

[Claims] 1. A spike pin is set in each of a plurality of spike pin receiving holes provided on an inner bottom surface of a mold, and then , the spike pins are spread over the back surface of the set spike pins.
Corresponding to the rear surface of the plurality of spike pins
Made of synthetic resin with a ridge that protrudes
A retaining plate over the back of the spike pins.
And then abut the back of the shoe body on the restraining plate.
At the very least, attach the multiple ridges to the back of each spike pin.
After making contact with each other, inject a predetermined synthetic resin material into the mold
The method for molding the sole of an injection-molded spiked shoe is characterized in that the shoe sole is integrally molded .