JP2574860Y2 - Tip and safety shoes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front shoe used for safety shoes and other shoes.

[0002]

2. Description of the Related Art Conventionally, a core made of a reinforced plastic material mixed with carbon fibers or the like has been proposed, but little consideration has been given to the strength of a skirt portion bent inward from the bottom. FIG. 5 shows a plan view from the back of a conventional core A 'made of a reinforced plastic material.
The skirt portion 3 is formed by bending both sides 2 and 2 inward. In the skirt portion 3, the width X 'at the front end and the widths Y' and Y 'at the rear end are substantially equal (X' ≒
Y '), and the inner peripheral edge 4 is formed in an arc shape.

[0003]

However, when a large load of pressure P is applied from above as shown in FIG. , 5 and a crack 6 is generated at the tip 1. FIG. 7 shows European Patent No. 0219.
633 is a plan view of a leading core A 'shown in the specification, and a width X "of a front end 1 of a skirt portion 3 is a rear end Y";
Although it is formed wider than the width of Y ″, the skirt 3
The inner peripheral edge 4 is not formed in an arc shape, and the edge on the tip 1 side is formed in a linear portion 6. Also in this case, a large load applied to the upper surface of the leading core causes the both sides 2 and 2 of the skirt portion 3 to spread in the direction of the outward arrow. In this case, the tip portion 1 does not crack, but the skirt portion 3 is a connecting portion 8 between the arc-shaped portions 7, 7 of the inner peripheral edge 4 and the linear portion 6.
Cracks 9 and 9 are generated due to the concentration of stress in the steel.
Therefore, the safety shoes using the above-mentioned front core have a drawback that they are weak in pressure resistance and impact resistance. The present invention provides a leading core that does not cause cracks or cracks in any part of the skirt portion even when a load is applied to the upper surface, and also provides a safety shoe excellent in pressure resistance and impact resistance. It is assumed that.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a reinforced plastic material made of a carbon fiber, a glass fiber, or the like, which is bent inward from the bottom of the tip and both ends to form an inner peripheral edge. Is a front core having a skirt portion formed in an arc shape, and the width of the skirt portion is gradually widened from the rear end toward the front end, and a safety shoe using this front core. Means.

[0005]

[Function] In the leading core of the present invention, the width of the skirt is from the rear end.
As the shape gradually increases toward the tip , and the inner peripheral edge of the skirt is formed in an arc shape, a large load is applied to the upper surface of the leading core, causing the phenomenon that both sides of the leading core spread outward. However, cracks and cracks do not occur in any part of the skirt including the tip without stress concentration.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows a first embodiment of a leading core of the present invention, and FIG. 2 shows a second embodiment. It is the top view seen from. First, the first embodiment of FIG. 1 will be described. The leading core A is made of a reinforced plastic material using nylon resin or the like mixed with carbon fiber, glass fiber, etc., and the surface shape is not shown. It is not different from the conventional shape. In the drawing, reference numeral 11 denotes the tip of the leading core A, 1
Reference numerals 2 and 12 'denote the side portions of the little finger and the thumb, and 13 denotes the tip 1
1 and a skirt portion formed by bending inward from both side portions 12, 12 ', and an inner peripheral edge 14 of the skirt portion 13 is formed in an arc shape. This skirt part 1
The width X of the front end 11 of the third part is wider than the width Y ₁ on the little finger side at the rear end and the width Y ₂ on the thumb side.

Specifically, the thickness of the core A is 2 mm, and X is 1
2 mm, width Y ₁ of the rear end the little finger side of 7 mm, width Y ₂ of the thumb side is made as a 9 mm. FIG. 3 shows the results of a test conducted on the assumption that the connection between the upper surface portion of the leading core A and the skirt portion and the arrangement of the mixed fibers in the skirt portion are the same as those of a conventional general leading core. FIG. 3 shows the tip 1 of the skirt.
The relationship between the width X (mm) of No. 1 and the crack ratio (%) at the tip is shown by a curve, and the larger the width X at the tip, the smaller the crack ratio. FIG. 2 shows the skirt 1 of FIG.
The width 3 is made wider from the tip 11 toward the little finger, and then gradually narrowed toward the side 12. The effect of preventing the tip 11 from cracking is the same as in FIG. There is. As shown in FIG. 6, the little finger side of the leading core has a gentler inclination than the thumb side, so that when a load is applied, the little finger side exerts a large spreading force and a large stress is generated on the little finger side, but the little finger side becomes wider. Cracking does not occur.

FIG. 4 shows FIGS. 1 and 2 constructed as described above.
A safety shoe using A shown in the embodiment of the present invention, wherein the leading core A is fixed between the upper 15 and the lining fabric 16 at the toe of the safety shoe,
The skirt 13 is mounted between the midsole 17 and the midsole 18. In addition, 19 is an outsole.

[0009]

As described above in detail, according to the present invention, the width of the skirt is gradually increased from the rear end to the front end , and the inner peripheral edge of the skirt is formed in an arc shape. Therefore, even if a large load is applied to the upper surface of the leading core and a phenomenon occurs in which both sides of the leading core spread outward, cracks and cracks are generated in any part of the skirt portion including the leading end. There is nothing.

[Brief description of the drawings]

FIG. 1 is a plan view of a back surface of a leading core showing a first embodiment of the present invention.

FIG. 2 is a plan view of a back surface of a leading core showing a second embodiment of the present invention. FIG.

FIG. 3 is a diagram showing a relationship between a width of a leading end of a skirt portion in a leading core and a crack ratio of the leading end.

FIG. 4 is a partial cross-sectional side view of the safety shoe according to the embodiment of the present invention.

FIG. 5 is a plan view of a back surface of a conventional leading core.

FIG. 6 is a front sectional view for explaining a deformed state of a leading core when a load is applied to the upper surface.

FIG. 7 is a plan view of a leading core different from the conventional one shown in FIG. 4;

[Explanation of symbols]

A Front core X Width of the tip of the skirt Y ₁ Width of the rear end of the little finger Y ₂ Width of the rear end of the thumb 11 Top 12, 12 ′ Both sides 13 Skirt 14 Inner edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A43B 23/08-23/17 A43B 7/00-9/20

Claims (2)

(57) [Scope of request for utility model registration] 1. A skirt made of a reinforced plastic material mixed with carbon fiber, glass fiber or the like, which is bent inward from the bottoms of the front end and both ends and has an inner peripheral edge formed in an arc shape. The width of the skirt is at the rear end
The forehead, characterized in that it gradually widens toward the tip . 2. A safety shoe formed by using the front core according to claim 1.