JPS5832962B2 - The horn is growing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing synthetic resin injection molded safety shoes having a protector made of steel, other metal, synthetic resin, etc. attached to the tip.

In the past, there were boots-shaped safety shoes with protectors attached to the toes, but since most of them are made of rubber, they are made by hand, and the manufacturing method is to make one piece of raw rubber for each part. The product was pasted onto a mold by hand, molded, and processed through a vulcanization process.

As a result, the production process and materials are extremely complex and diverse, resulting in high prices.

The object of the present invention is to eliminate these conventional drawbacks and provide a manufacturing method in which the lace and sole are integrally molded by injection molding, and at the same time the protector is attached and fixed to the toe part in a sandwich-like manner.

An embodiment of the present invention will be described in more detail with reference to the drawings.
An arbitrary number of protector presser posts 1a are provided that protrude from the toe lobes and the center of the toe tip of the inner mold 1 for injection molding,
Furthermore, a sock-like lining cloth 3 is attached to the inner mold 1 for injection molding, which is provided with protector guide plates 1b on both sides of the bottom surface of the toe of the inner mold 1.
For example, a knitted fabric or the like is suspended, and a protector 2 having a flow hole 2a provided at the tip of the toe of the inner mold 1 is pressed with a mallet or the like using the protector holding column 1a and the protector guide plate 1b as a guide. After confirming that the protector 2 does not shift or fall, heat polyvinyl chloride, polyethylene, acrylic resin, etc., into the gap formed by the inner mold 1 and the outer mold. Injection molding is performed using a plastic synthetic resin injection molding material.

The protector holding column 1a maintains a constant gap between the inner mold 1 and the protector 2 and serves as a receiver for the protector 2. Therefore, the protector 2 is placed between the protector holding column 1a and the bottom surface of the inner mold 1. be done.

The protector guide plate 1b is provided as a guide for setting the protector 2 at an appropriate position and for checking the shift of the protector 2 from side to side.

Furthermore, the flow holes 2a provided in the protector are formed in the protector 2 when the injection synthetic resin material 4 is injected into the mold.
This is to improve the flow inside, and is extremely effective in improving strength.

The protector 2 of the present invention may be made of steel or other metals, or may be made of synthetic resin.

It goes without saying that in addition to the illustrated boots-shaped security shoes, semi-long sheath-like boots can also be made in the same manner.

The method for manufacturing injection molded safety shoes of the present invention includes constructing a protector holding column protruding from the toe flange and the center of the toe tip of an inner mold, and further providing protector guide plates on both sides of the toe bottom of the inner mold. After suspending the sock-like lining fabric into the constructed inner mold for injection molding, the protector is held and fixed on the tip of the toe of the inner mold, and at the same time as the sheath is injection molded, the protector is placed in a predetermined position inside the toe of the shoe. Since it is fixed, the protector is always held in a predetermined position without fear of slipping, and it has high production efficiency and is suitable for mass production, making it possible to provide inexpensive products.

As mentioned above, this is a manufacturing method for injection molded safety shoes that significantly simplifies the molding process and reduces costs compared to conventional rubber boot-shaped safety shoes, and the assembly material is changed from rubber to polyvinyl chloride. By changing to a synthetic resin material such as resin, it is possible to obtain injection-molded safety shoes with excellent oil resistance.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of safety shoes according to the present invention, and Fig. 2 is a partially cutaway enlarged sectional view showing an embodiment of the present invention, in which 1 is an inner mold for injection molding, and 1a is a protector presser post. Part, 1b
2 represents a protector guide plate, 2 represents a protector, 2a represents a flow hole, 3 represents a sock-like lining cloth, and 4 represents an injection synthetic resin material.

Claims (1)

[Claims] 1. For injection molding, an arbitrary number of protector presser posts are provided protruding from the toe lobes and the tip of the toe of the injection mold, and protector guide plates are further provided on both sides of the bottom of the toe of the inner mold. A sock-like lining cloth is suspended in the mold, a protector with flow holes provided at the tip of the toe of the inner mold is held and fixed, and a thermoplastic synthetic resin is placed in the gap formed by the inner mold and the outer mold. The laces, soles, etc. are formed by injection molding, and at the same time, the main body injection synthetic resin is press-fitted through the flow holes of the protector, thereby integrally fixing the protector at a predetermined position inside the toe part of the shoe. A method for manufacturing shoes using injection molding materials.