JP3402688B2 - Injection molded safety shoes and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded safety shoe having a toe protector for protecting a toe portion of a foot from dropping heavy objects and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a conventional safety shoe, a last mold is covered with a cover, a toe protector made of steel is attached to the toe, and a lower peripheral edge of the protective cover and an outer peripheral edge of the insole are adhesively suspended. A structure in which the outsole is adhered to be integrally formed is generally known.

[0003]

However, the safety shoes manufactured in this manner are proficient because they take time to make a suspension molding work due to a hand-made work, are inefficient, and require advanced technology. However, there is a problem that it takes time and defective products are likely to be produced, so that the cost also increases. Further, the conventional covering materials for safety shoes have been limited to synthetic resin leather, synthetic leather, natural leather and the like.

The present invention has been made against the background of the prior art as described above. The purpose of the present invention is to be efficient because the manufacturing work time can be shortened. An object of the present invention is to provide an injection-molded safety shoe that can be made inexpensive and a manufacturing method thereof.

[0005]

In the injection-molded safety shoes of the present invention, a front cover and a back cover constitute a cover, and a pair of cover is provided between the cover and the back cover .
The shoe sole is injection-molded on the roof covering with the u-protector.
An injection-molded safety shoe that is formed by
The back cover is fixed to the front cover except the tip part, and the toe part of the insole
The outer peripheral edge excluding the
The outer edge of the toe part of the insole is sewn to the lower edge of the back toe.
The toe protector between the front cover and back cover of the toe
And a large number of loops made of thread are attached to the front cover toe
Squeezed by a string provided in the lower peripheral edge and inserted in the loop
It is characterized in that it is configured to be pluggable . In addition, the method of manufacturing the injection-molded safety shoes of the present invention comprises a step of stacking a front cover and a back cover and fixing them except for the toe part, and then fixing the lower peripheral edge of the cover and the outer peripheral edge of the insole to the toe part. The step of removing and suturing, the step of suturing the lower edge of the toe of the sole and the outer edge of the insole of the insole, and the string for narrowing at the same time by providing a large number of loops made of thread on the outer edge of the outer toe. Step of inserting the toe protector obtained as described above into the last mold, and attaching the toe protector between the front cover toe part and the back cover toe part, then the front cover. The process comprises the steps of pulling both ends of a loop string provided on the lower peripheral edge of the toe part to be in close contact with the last mold, fixing and then injection molding to form a shoe sole.

[0006]

In the present invention, the front cover and the back cover are overlapped and fixed except for the toe part, and the fixed lower peripheral edge of the cover and the outer periphery of the insole are sewn together except for the toe part, and are fixed to the front cover. The toe protector can be easily attached between the front and back toe parts because the lower rim of the back toe part and the outer periphery of the insole of the insole are sewn together. Also, since a number of loops made of thread are provided on the lower peripheral edge of the toe cover and a string for narrowing down is inserted at the same time, it is a safety shoe with a toe protector, but with an injection molding method with high production efficiency. ,
Injection-molded safety shoes can be provided.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings, but the present invention is not limited thereto.

In the present invention, the front cover 1 and the back cover 2 are superposed on each other except the toes to form the cover 3, which is the cover 1.
May be configured by only one sheet, or may be configured by stacking a plurality of members by providing a toe reinforcing cloth or the like on the toe portion. Like the conventional injection-molded shoes, the outer cover 1 is preferably made of synthetic resin leather, synthetic leather, natural leather, canvas, or the like, which are comfortable to wear, and these materials may be used alone or in combination. They may be used in combination, and may be used in combination with, for example, a synthetic resin film or a synthetic resin sponge sheet.

The back cover 2 is made of a material such as synthetic resin leather, synthetic leather, natural leather, woven cloth, non-woven cloth, knitted cloth, or a laminated sheet of knitted cloth and synthetic resin, as in conventional injection molded shoes. If so, there is no particular limitation.

As with the conventional injection-molded shoes, the insole 5 can be made of synthetic resin leather, synthetic resin sheet, synthetic leather, natural leather, woven cloth, non-woven cloth, knitted cloth or the like.

The lower peripheral edge of the scabbard 3 and the outer peripheral edge of the insole 5 which are fixed as described above are sewn together except for the toe portion. It is preferable to use California stitching in which the portion 10 is located on the shoe sole 8 side and is sewn to form the sewn portion 11. When stitched by the California sewing, there is no possibility that the resin will exude when the injection-molded resin for shoe sole is injected and the appearance will be impaired. Alternatively, the seam allowance portion 10 may be sewn so as to be positioned inwardly in contact with the foot in a palm-shape. in this case,
Since the seam allowance portion 10 may come into contact with the foot inserted into the armor cover 3 and make it uncomfortable to wear, the seam allowance portion 10 may be laid down sideways and fixed by an adhesive. Of course, even when the seam allowance portion 10 is positioned on the side of the shoe sole 8, it is also possible to take a similar procedure such as laying it down sideways and fixing it with an adhesive or the like.

Next, the lower peripheral edge of the toe part of the back cover 2 and the outer peripheral edge of the toe part of the insole 5 are sewn together. As a method for this, strobe-type sewing in which both peripheral edge ends are abutted to form the sewn portion 12 is preferable. .

Further, a large number of loops 6 made of thread are provided on the lower peripheral edge of the toe part of the front cover 1 and, at the same time, a string 7 is inserted for narrowing down the loops. Sew with a thread as you would get. The string 7 is arranged around the entire lower peripheral edge of the toe part of the front cover 1 and both ends thereof are exposed to the outside of the loop 6.

The cover A thus obtained is suspended in the last mold 13, and the toe protector 4 is attached between the toe cover 1 toe and the back cover 2 toe to provide the cover 1 toe. After pulling both ends of the string 7 provided at the subordinate peripheral edge so as to be closely adhered to and fixed to the last mold 13, a shoe sole injection molding void portion 8 ′ constituted by the last mold 13, the side mold 14, and the bottom mold 15 is fixed. A resin such as vinyl chloride resin, thermoplastic rubber or polyurethane is injection-molded through the injection port 16 and integrally joined.

In this embodiment, when the shoe sole is formed by injection molding, a cushion pad 17 made of an ethylene-vinyl acetate copolymer resin foam is attached to the heel of the back of the insole. Injection molding by this method has the advantages of improved cushioning properties and reduced weight.

The material of the toe protector 4 may be made of synthetic resin, metal or the like. However, use of a synthetic resin material makes it lightweight and easy to move, so that agile operation is possible when worn and it is intense. Suitable for work that requires movement, such as gas stations and the transportation industry. Also, regarding the toe protector 4 of the present embodiment, JIS T 81
When it was measured by (8.1. (3) Test method) based on 01 (8.1 Pressure test of finished product), it was within the numerical range of compression load class L.

Further, in this embodiment, the cushioning material 9 is interposed between the back cover 2 and the toe protector 4. The cushioning material 9 serves as a cushioning material for preventing the foot from being hit by wearing the toe protector 4. As a method for interposing the cushioning material 9 between the toe protector 4 and the toe cover 2 toe portion, a method of fixing the cushioning material 9 to the back cover 2 or the toe protector 4 with an adhesive or an adhesive agent, or simply a back cover 2 and the toe protector 4 may be used. As the above-mentioned adhesives and pressure-sensitive adhesives, conventionally known adhesives and pressure-sensitive adhesives such as hot melt adhesives can be used. Further, it may be fixed by an adhesive tape, an adhesive tape or the like. In addition, as the cushioning material 9,
Any material having a cushioning property such as a nonwoven fabric or a synthetic resin foam may be used. Examples of the synthetic resin foam include urethane resin foam, rubber foam, vinyl chloride resin foam, ethylene-vinyl acetate copolymer resin foam and the like.

The cushioning material 9 may be provided at least in a portion corresponding to the end portion 4'of the toe protector 4,
In this embodiment, a one-character strip-shaped cushioning material 9 is fixed on the back cover 2 corresponding to the end 4 ′ of the toe protector 4. The shape of the cushioning member 9 is not limited to the one-character strip shape, and may be any shape.

[0019]

As described above, according to the present invention, it is possible to easily provide, by injection molding, safety shoes having a toe protector incorporated therein, which can be made only by hand. Further, the manufacturing work time can be shortened, which is efficient, requires less manpower, and can be used in a short time, so that the cost can be reduced. Furthermore, by using a toe protector made of synthetic resin, it is lightweight and easy to move, so it is possible to move quickly when wearing it, and it is suitable for work at gas stations, the transportation industry, etc. that require vigorous movement. Are suitable. Further, as the cover of the present invention, any cover material used as an injection-molded shoe can be used, so that a relatively thin material can be freely adopted.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of the present invention.

FIG. 2 is a perspective view of a toe protector showing an example of the present invention.

FIG. 3 is an end view showing an example of an injection-molded state of the injection-molded safety shoe of the present invention.

FIG. 4 is an enlarged view of a main part of FIG.

[Explanation of symbols]

A ... 1 ... front cover 2 ... Back cover 3 ... 4 toe protector 4 '... end 5 ... insole 6 ... loop 7 ... string 8 ... Sole 8 '・ Shoe bottom injection molding void 9: cushioning material 10 ... Seam allowance 11, 12 ... Sutured part 13 ... Last mold 14 ... Side mold 15 ... Bottom mold 16 ... Ejection port 17 ... Cushion pad

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Claims (3)

(57) [Claims] 1. A front cover and a back cover constitute a cover, and both cover are covered.
Inject shoe soles into the covering with a toe protector between
An injection-molded safety shoe formed by molding, wherein the back cover is fixed to the front cover except the toe part,
The outer peripheral edge excluding the toes of the insole is the bottom excluding the toes of the armor cover.
It is sewn on the peripheral edge and the outer peripheral edge of the toe part of the insole is below the back toe part.
Sutured to the periphery, the toe protector covers the surface of the toe.
A large number of loops made of thread are provided between the back cover and
Provided on the lower peripheral edge of the toe covered part and inserted into the loop
An injection-molded safety shoe, characterized in that it can be narrowed down by a string . 2. The injection-molded safety shoes according to claim 1, wherein a cushioning material is interposed between the back cover and the toe protector. 3. A step of superposing a front cover and a back cover and fixing them together except for the toe part, a step of next stitching the fixed lower peripheral edge of the cover and an outer periphery of the insole excluding the toe part, then a back covering. The step of stitching the lower peripheral edge of the toe portion and the outer peripheral edge of the middle toe portion, then the step of inserting a string for narrowing at the same time as providing a number of loops made of thread on the lower peripheral edge of the toe covered portion, and then performing the above The step of suspending the obtained covering object in the last mold and attaching the toe protector between the front cover toe part and the back cover toe part, then the loop cord provided on the lower peripheral edge of the front cover toe part. A method for manufacturing an injection-molded safety shoe, comprising the steps of pulling both ends to be in close contact with a last mold, fixing the same, and then injection-molding to form a shoe sole.