JPH0880202A - Box toe for security shoes and manufacture thereof - Google Patents

Abstract

PURPOSE: To improve the strength against pressure and shock, by bulging inwards some linear parts inside a box toe. The height of the bulge, smaller than the thickness of adhesive tape against falling, does not require any substan tial change of the thickness and the shape of a shoe. CONSTITUTION: The body of a box toe has a curved arch 21 for protecting the toe of a wearer and and a curved part 22, curving inwards under the part 21 and buried between the insole and the outsole. The arch 21 has a ceiling 21a, both side walls 21b and 21c, and a rear end face 21d. The arch 21 has in its inside several linear parts 23 bulging inwards along the width. Their heights are various but all lower than the adhesive tape against falling 17. By those means the parts 23 strengthen the box toe 11 against pressure and shock without changing substantially its thickness and shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toe for a safety shoe to be attached to the toe of a safety shoe in order to protect the wearer's toe from pressure and impact, and a method for manufacturing the toe.

[0002]

2. Description of the Related Art Conventionally, the strength of this type of toe core for safety shoes has been defined by the Japanese Industrial Standard (JIS) in terms of pressure resistance and impact resistance. For example, leather safety shoes are used for heavy work and normal work. It is said that a metal material is used for the work, and a metal material or a resin material is used for the light work.

Here, as shown in the perspective view of FIG. 6 and the longitudinal sectional view of FIG. 7, when a resin material is used for the toecap 1, the arched toecap body 2 is made of glass fiber, carbon fiber, or the like. A lower side bent portion 3 bent inward is provided on the lower side of the toe core body 2 which is molded from a fiber reinforced resin reinforced by. The paragraph prevention tape 4 is attached to the inside of the toecap body 2.

On the other hand, the gate of the mold through which the resin flows when the toe core body 2 is injection-molded is usually provided at the tip of the toe core body 2 and, for example, as shown in FIG. A runner corresponding to the mold gate is arranged at the tip of the toecap body 2. Therefore, when the fiber reinforced resin is injected from the gate 5 into the mold cavity, the fiber arrangement is aligned in one direction from the front end portion to the rear end portion as shown in the direction A. The thickness of the toe core main body 2 is constant as a whole or the vicinity of the rising portion of the tip of the toe core main body 2 is made thicker.

[0005]

However, in the core body 2 made of a resin material, the overall thickness is constant or the vicinity of the rising portion of the tip of the core body 2 is thick, and the fiber arrangement is directional. As shown by A, since it goes from the front end portion to the rear end portion, there is a problem that although it satisfies the standard, the strength against impact is not sufficient and a crack is easily generated.

On the other hand, in order to have sufficient strength, it is necessary to change the thickness and shape and the shapes of shoe soles, insteps and the like associated therewith, resulting in high cost and difficulty in design. There is a point.

An object of the present invention is to solve the above-mentioned problems and to provide a toecap for a safety shoe and a method for manufacturing the same, in which the pressure resistance and the impact resistance are improved without significantly changing the wall thickness or the shape. To do.

[0008]

A toe core for a safety shoe according to a first aspect of the present invention for achieving the above object comprises a fiber reinforced resin for attaching to a foot portion of a safety shoe and protecting the foot. In a toecap for safety shoes in which a paragraph prevention tape is attached to the inner surface of the rear end of an arch-shaped toecap body, at least one ridge portion protruding inward is formed on the inner surface of the toecap body along the width direction, The height of the ridge portion is smaller than the thickness of the paragraph prevention tape.

The method of manufacturing a toecap for a safety shoe according to the second aspect of the present invention is characterized in that in the case of injecting a fiber reinforced resin into a mold to form a toecap body having a ridge portion protruding inward, The fiber reinforced resin is caused to flow into the mold from the side wall or the side of the rear end of the core body, and the fibers of the fiber reinforced resin are arranged substantially along the width direction of the toe core body.

[0010]

In the toecap for a safety shoe according to the first aspect of the present invention having the above-mentioned structure, at least one of the toecap bodies is formed on the inner surface of the toecap body along the width direction.
Since the ridge portion of the book is provided, the ridge portion reinforces the toe core body and improves the strength of the toe core body.

In the method of manufacturing the toecap for safety shoes according to the second aspect of the invention, since the fiber reinforced resin is flown into the mold from the side wall or the rear end side of the toecap body, the direction of the fiber arrangement of the resin is The pressure resistance and impact strength of the toe box are improved in the direction along the ridge provided on the toe box body.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a partially cutaway sectional view of a safety shoe using a toecap according to the present embodiment, and FIG. 2 is a perspective view of a toecap body 11.
FIG. 3 is a vertical sectional view of FIG. The toe box body 11 is the sole 12
Are internally provided at the toes of the toe, and an instep cover 13 is attached to the toe core body 11 and the shoe sole 12. A midsole 15 is laminated on the upper surface of the shoe sole 12, and a midsole 16 is laminated on the upper surface of the midsole 15, and a paragraph prevention tape 17 is attached to the inner surface of the toecap body 11.

The toecap body 11 is made of a fiber reinforced resin material having carbon fiber, glass fiber or the like as a reinforcing material, and is formed by, for example, injection molding. The toe core body 11 has a curved arch portion 21 for protecting the wearer's toes, and the shoe sole 12 and the midsole 1 are bent inward from the lower side of the arch portion 21.
6 and a lower side bent portion 22 embedded between the two.

Here, the arch portion 21 has a top wall 21a, both side walls 21b and 21c, and a rear end surface 21d.
The inner surface of 1 has a plurality of ridges 23 provided along the width direction.
Have different thicknesses and project inward at a height smaller than the thickness of the paragraph prevention tape 17. The number of the ridges 23 may be arbitrary, but at least one is required.

On the other hand, the paragraph prevention tape 17 is formed of an elastic material such as rubber or soft resin so as to match the shape of the ridge portion 23 of the arch portion 21. That is, the paragraph prevention tape 17
Has a predetermined thickness for preventing the paragraph of the arch portion 21 at the middle portion, and is formed so as to gradually decrease in both directions of the front end portion 17a and the rear end portion 17b. It is attached steplessly to the inner surface of the rear end 17
b is arranged on the inner surface of the instep 13 without step.

When pressure or impact is applied to the toe core body 11 having such a structure, the ridge portion 23 causes the toe body 1 to move.
Acts to reduce the deformation of 1. Further, the ridge portion 23 has an effect of improving the adhesion between the toe core main body 11 and the paragraph prevention tape 17 by increasing the adhesion area. Further, the paragraph prevention tape 17 has elasticity and the core body 11
Since the wearer's instep and side portions do not directly touch the hard toe box main body 11 because of the stepless adhesion, the foot contact is improved due to the straining action. Further, since the paragraph prevention tape 17 is adhered to the rear end of the toecap body 11 without any inconsistency, no step is formed on the instep 13 and the appearance quality is improved. Further, since the foot contact is improved and the appearance quality is improved, there is also an advantage that the length of the toe core main body 11 can be made longer than in the conventional case and the protection range of the foot tip is widened.

FIGS. 4 and 5 are perspective views showing a method for manufacturing a toecap for safety shoes. The gate of a mold (not shown) for injecting the fiber reinforced resin is inside the arch portion 21 of the toecap body 11. Alternatively, the fiber reinforced resin is provided at a position corresponding to the side of the outer side wall 21b or the rear end 21d, and the fiber reinforced resin is flown into the mold from this gate. Although the runner corresponding to the mold gate 24 or 25 is left on the toe box main body 11, this runner is cut in a later step.

As a result, the fiber arrangement of the resin flowing into the mold from the gate of the mold is easily oriented in the direction along the ridges 23, and the compression resistance and impact strength of the toecap body 11 are improved. It will be.

Although the ridge portion 23 is formed by injection molding in the above-mentioned embodiment, the ridge portion 23 itself can be molded by compression, extrusion, transfer or the like.

[0020]

As described above, in the toe core for safety shoes according to the first aspect of the invention, since the ridge portion oriented in the width direction is provided on the inner surface of the toe core body, the ridge portion reinforces the toe core body. The pressure resistance and impact resistance can be improved without significantly changing the wall thickness or the shape.

Further, in the method of manufacturing the toecap for safety shoes according to the second aspect of the invention, the fiber reinforced resin flows into the mold from a position corresponding to the side wall or the rear end side of the toecap body. The direction of arrangement is substantially in the width direction, and the strength of the toecap body is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a safety shoe using a toecap of an embodiment.

FIG. 2 is a perspective view of an example.

FIG. 3 is a vertical sectional view.

FIG. 4 is a perspective view of a runner and fibers in a manufacturing method.

FIG. 5 is a perspective view of a runner and fibers in a manufacturing method.

FIG. 6 is a perspective view of a conventional example.

FIG. 7 is a vertical sectional view.

FIG. 8 is a perspective view of the runner and the fiber direction.

[Explanation of symbols]

 11 Toe Core Body 12 Sole 13 Instep 17 Paragraph Prevention Tape 21 Arch 22 Lower Bent 23 Ridge 24, 25 Gate

Claims (3)

[Claims] 1. A toe for a safety shoe in which a paragraph-preventing tape is attached to the inner surface of the rear end of an arch-shaped toe core body made of fiber reinforced resin to be attached to the foot of a safety shoe to protect the toe. At least one ridge portion protruding inward is formed on the inner surface of the toe core body along the width direction, and the height of the ridge portion is smaller than the thickness of the paragraph preventing tape. Toecap for safety shoes. 2. The toecap for a safety shoe according to claim 1, wherein the fibers are arranged in a direction along a ridge portion of the toecap body. 3. When the fiber reinforced resin is injected into a mold to form a toe core body in which a ridge portion protrudes inward, the fiber reinforced resin is applied from a side wall or a rear end side of the toe body. A method for manufacturing a toecap for safety shoes, characterized in that the fibers of the fiber-reinforced resin are flown into the mold and arranged in a substantially widthwise direction of the toecap body.