JP2016063891A - Work shoe made of synthetic resin containing toe core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide lightweight and inexpensive work shoes made of a synthetic resin, excellent in wearing comfort.SOLUTION: There are provided work shoes formed of a synthetic resin integrally from a sole part to an upper part. A horseshoe-shaped recessed groove (6) is formed on an inner surface toe part of the sole part (3), and an inner surface part of the toe part of the upper part (2) is recessed to form a toe core storage part (8), and a toe core (4) made of a resin is bonded and fixed to the toe core storage part (8).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lightweight work shoe, and more particularly to a synthetic resin work shoe including a tip that is integrally formed with a synthetic resin from a sole part to an upper part.

  Conventionally, many work shoes into which a tip is inserted have been proposed. In conventional work shoes with a toe-point, the sole portion and the upper portion are formed separately, and the upper portion and the sole portion are joined together by stitching or adhesion. As such work shoes, for example, a cloth-like body such as a woven fabric, a knitted fabric, or a non-woven fabric is provided on the inner side of the upper constituting the upper body, and for protecting the toes between the cloth-like body and the upper. There has been proposed a method in which a resin layer is formed by injecting a filling resin between a cloth-like body and a tip when the tip is attached and the sole portion is formed. (Patent Document 1)

JP 2009-142422 A

  In conventional work shoes with a front core including those disclosed in Patent Document 1, a cloth-like body called a front and back disposed on the rear edge portion of the front core or the inner surface of the front core is the inner wall of the upper member. It protrudes slightly into the space inside the shoe, and this protruding portion may come into contact with the tip of the foot or the instep of the foot, affecting the comfort.

  In recent years, there are also working shoes that are integrally molded from the sole part to the upper part with synthetic resin according to the work environment. In this case, the tip of the shoe is cast into the shoe tip part. Since the tip must be held in the mold in a floating state, there is a problem that the molding mold becomes complicated and leads to an increase in cost.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a synthetic resin work shoe with a toe core that is light and inexpensive and comfortable to wear.

  In order to achieve the above object, the present invention described in claim 1 is a work shoe in which a sole portion to an upper portion are integrally formed of a synthetic resin material, and a horseshoe-shaped concave portion is formed on an inner toe portion of the sole portion. A groove is formed, and an inner surface portion of a toe portion of the upper portion is formed into a recess to form a tip core housing portion, and a resin tip is bonded and fixed to the tip core housing portion.

  In the present invention, a horseshoe-shaped concave groove is formed in the inner toe portion of the sole portion, and the inner portion of the upper portion of the upper portion is recessed to form the tip core accommodating portion, and the synthetic resin from the sole portion to the upper portion is formed. Since the tip made of resin is bonded and fixed to the tip lead housing part of the molded footwear molded integrally with the material, the die is held to hold the tip like a case where the tip is cast with resin. It is not necessary to form it in a special shape, and since the attached tip is housed in the thick part of the footwear, the tip end opening of the tip no longer protrudes into the footwear space. Comfortable work shoes can be provided.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention. It is a principal part expanded sectional view in the state where the tip was removed from the toe part. It is a perspective view in the state where the upper part was removed. It is a longitudinal cross-sectional view in a different embodiment.

  FIG. 1 is a longitudinal sectional view of a work shoe showing an embodiment of the present invention. The work shoe (1) includes an upper part (2) that covers the instep part of the foot and a sole part that protects the sole part ( 3) is a shoe type in which a resin tip (4) is assembled to a toe portion of a molded footwear (shoe mold) integrally formed with EVA (ethylene vinyl acetate copolymer) resin.

  A synthetic rubber bottom rubber (5) having an electrostatic function and a no-marking function is cast on the ground contact surface of the sole portion (3) in an integral manner when forming a footwear molding. The heel side portion of 5) is configured such that a part thereof is exposed to the internal space of the molded footwear. Thereby, static electricity charged in the body is easily grounded. The bottom rubber (5) is improved in slip resistance by a tread pattern formed on the ground contact surface.

  The tip core (4) assembled on the toe side of the molded footwear is formed of a material obtained by impregnating a reinforcing fiber such as glass fiber or carbon fiber with a resin such as polyamide or polycarbonate.

  As shown in FIGS. 2 and 3, the toe side of the footwear molded body has a horseshoe-shaped groove (6) that is recessed in the sole toe side inside the footwear molded body, and the rising side wall and upper surface of the footwear molded body. The tip core accommodating portion (8) is formed by the concave portion (7) formed in the inner surface of the cover portion, and the tip core (4) coated with an adhesive is inserted and fixed to the tip core accommodating portion (8). It is like that.

  At this time, the rear end edge portion of the tip core (4) is located within the recessed dimension of the tip core housing portion (8) and does not protrude into the inner space of the footwear molded body. For this reason, even if the tip core (4) is not covered, the foot tip does not come into contact with the end edge portion of the tip core (4), and it is possible to obtain a good comfort without feeling uncomfortable.

  FIG. 4 is a longitudinal cross-sectional view of a work shoe showing another embodiment of the present invention, which is an upper part (2) that forms a footwear molded body (shoe mold) in a sandal tie and covers the upper part of the foot. ) A back strap (9) is rotatably fixed to a portion near the rear end. Also in this case, the tip 4 is inserted and bonded to the toe portion with the same structure as described above.

  In both of the above embodiments, there is no mention of mounting an insole inside the molded footwear, but it does not exclude the use of the insole.

  The work shoes having the above-described configuration are subjected to a slip resistance test, an impact test, a compression test, an antistatic performance test in accordance with a test for safety shoes of JIS T 8101: 2006 and a test for antistatic shoes of JIS T 8103: 2010. Went.

In the slip resistance test, the average value of the dynamic friction coefficients measured five times was 0.32. In the impact test, as a result of dropping a 20 kg weight from a height of 60 cm onto the tip portion, no cracks that allowed light to pass through the tip portion were found. In the compression test, as a result of applying a compression force of 10 kN to the tip portion, no cracks that allow light to pass through the tip portion were observed. In the antistatic performance test, 7.2 × 10 ⁷ Ω for a 15 second value in an environment with a temperature of 0 ± 2 ° C., 7.5 × 10 ⁷ Ω for a 1 minute value, 50 ± 5% humidity, and a temperature of 23 The value for 15 seconds under an environment of ± 2 ° C. was 1.2 × 10 ⁷ Ω, and the value for 1 minute was 1.5 × 10 ⁷ Ω. Therefore, the work shoes according to the present invention have cleared the standards for safety shoes and antistatic shoes.

  The work shoes according to the present invention are suitable as work shoes for workers engaged in interior work / driver / medical work.

  DESCRIPTION OF SYMBOLS 1 ... Work shoes, 2 ... Upper part, 3 ... Sole part, 4 ... Resin tip, 6 ... Concave groove, 8 ... Tip core accommodating part.

Claims (3)

A work shoe (1) integrally formed of a synthetic resin material from a sole part (3) to an upper part (2),
A horseshoe-shaped concave groove (6) is formed in the inner toe portion of the sole portion (3), and an inner surface portion of the toe portion of the upper portion (2) is formed into a recess to form a tip core housing portion (8). A synthetic resin work shoe with a tip to which a resin tip (4) is bonded and fixed to the portion (8).   The work shoe (1) is a shoe type.   The work shoe (2) is a sandal type.

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