JP2001252101A - Vamp backer and safety shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vamp backer excellent in installing performance when installed in a safety shoe, preventing reduction in the volume in the shoe by swelling of an insole by addition of a load and being excellent in pressure resistance and impact resistance, and the safety shoe using this. SOLUTION: In this vamp backer 10 composed of fiber reinforced plastic, a skirt part being a lower side bending part is substantially eliminated except leaving a locking part 15 at least in a toe part and respective rear end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toe used for safety shoes and the like, and a safety shoe using the same.

[0002]

2. Description of the Related Art Safety shoes specified in JIS T 8101 are classified into heavy work (H), normal work (S), and light work (L) according to impact resistance and pressure resistance. . Among them, safety shoes that require relatively high strength for heavy work (H) and normal work (S) are made of metal, but in recent years, as demand for weight reduction has increased, 2. Description of the Related Art Fiber cores made of fiber reinforced plastic in which a matrix plastic such as polypropylene or polyamide is reinforced with glass fiber, carbon fiber, or the like, have become widespread.

[0003] By the way, since the tip of the tip of the safety shoe is for protecting the toe from the impact and the compression by the falling object, the tip of the tip is most required to be strong. However, fiber reinforced plastic cores can be lighter in weight than metal ones, but in order to achieve the same strength as metal, there is a limit in terms of manufacturing and cost. Various studies have been made with the aim of securing the same level of strength as made of steel.

For example, Japanese Utility Model Laid-Open No. 6-7507 discloses that
At least a vertical wall is formed at the distal end, and the connection between the skirt and the distal end bent inward is relatively large.
The shape of the skirt has a lower end and the lower end of the vertical wall reaches the bottom of the skirt to improve the pressure resistance and impact resistance at the tip, and to prevent poor strength at the connection of the skirt. Has been proposed.

Further, Japanese Utility Model Laid-Open No. 6-7508 proposes a structure in which the width of the skirt is gradually narrowed from the front end to the rear end so that the skirt is less likely to crack when a load is applied.

[0006]

However, if the radius R at the junction between the tip and the skirt is increased as in the former case, the shape of the leading core does not match the bottom edge of the last when attached to the last. In such a case, there is a problem that the wearability deteriorates, such as rattling.

When the width of the skirt portion of the toe is widened as in the latter case, when the back cover is squeezed to cover the skirt portion and adhere to the midsole, the back cover overlaps in a dumpling shape, resulting in poor cohesion. At the same time, the yield of the instep material deteriorates, and on the other hand, there is a problem that the resin does not easily flow to the tip of the wide skirt.

Further, FIG. 6 shows a state of a load applying experiment in the case of using a leading core having such a skirt portion. FIG. 6 shows a cross section of the tip of the shoe viewed from the toe side.
6B shows a state where no load is applied, and FIG. 6C shows a state where a load is applied. In addition, this shoe is provided with a back 1, a front core 2, and an upper 3 from the inside, and the hooked upper 3 is adhered to the inner sole 4, and further, a shoe sole 5 is provided on the inner sole 4. It is a thing.

According to this experiment, as shown in FIG. 6, when a load is applied, the bottom material 5 pushes up the skirt portion 2a of the front core 2, so that the skirt portion 2a is first deformed inward, and Side wall is pushed outward. As a result, the space in the shoe is reduced, and the required foot volume cannot be secured.

In view of such circumstances, the present invention has good wearability when worn on safety shoes or the like, prevents a decrease in the volume of the shoe due to the rise of the midsole due to the application of a load, and provides pressure resistance and resistance to pressure. An object of the present invention is to provide a toe core having excellent impact resistance and a safety shoe using the same.

[0011]

According to a first aspect of the present invention, a skirt portion, which is a bent portion on a lower side, is fixed to at least a front end portion and a rear end portion of a front core made of fiber reinforced plastic. The core is substantially eliminated except for leaving a part.

In the first aspect, since there is substantially no skirt portion, there is no problem that the space in the shoe is reduced due to the deformation of the skirt portion when a load is applied. And is integrated with the backing material.

According to a second aspect of the present invention, in the first aspect, the width of the skirt portion is minimized, and at least the front and rear ends of the skirt portion are partially wide locking portions. In the leading core.

In the second aspect, the width of the skirt is reduced to the minimum required by the JIS standard or the like, thereby reducing the problem that the space in the shoe is reduced due to the deformation of the skirt when a load is applied. In addition, it is mounted integrally with the upper cover and the backing material via the locking portion.

According to a third aspect of the present invention, there is provided a front core made of fiber-reinforced plastic, wherein the strength of a skirt portion, which is a bent portion on the lower side, is smaller than the strength of a rear end portion of an arch.

In the third aspect, the strength of the skirt portion is lower than that of the rear end of the arch, thereby preventing sinking of the leading core and preventing swelling of the upper cover and the midsole when a load is applied. Is done.

According to a fourth aspect of the present invention, there is provided the leading core according to the third aspect, wherein the thickness of the skirt is smaller than the thickness of the rear end of the arch.

In the fourth aspect, the strength of the skirt portion is reduced by reducing the thickness of the skirt portion, thereby preventing sinking of the leading core and preventing swelling of the upper cover and the insole when a load is applied. Is done.

According to a fifth aspect of the present invention, in the third or the fourth aspect, the width of the skirt portion is minimized and the locking portions which are partially wide at the front and rear ends of the skirt portion. In the leading core.

The fifth aspect further reduces the space in the shoe due to deformation of the skirt when a load is applied by reducing the width of the skirt to the minimum required by JIS standards or the like. It is reduced and is integrally attached to the upper cover and the backing material via the locking portion.

According to a sixth aspect of the present invention, there is provided a safety shoe to which the tip of any one of the first to fifth aspects is attached.

According to the sixth aspect, a safety shoe having the function of the leading core of the first to fifth aspects is provided.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments.

(Embodiment 1) FIG. 1 is a perspective view, a transverse sectional view, a vertical sectional view, and a rear view of a leading core according to an embodiment.
FIG. 2 is a view showing an example of the safety shoes to which the tip is attached, and FIG. 3 is a view showing an assembling process of the safety shoes.

As shown in these drawings, the leading core 10
It has a shape that covers the upper part of the toe of the shoe, and includes an upper surface portion 11, a tip portion 12 that is smoothly bent from the upper surface portion 11 and is integrally formed, and side surface portions 13 on both sides. Also,
At the lower ends of the substantially central portion of the distal end portion 12 and the rear end of the side surface portion 13, a locking portion 15 bent inward is integrally formed. The locking portion 15 is a partially bent portion on the lower side, that is, a so-called skirt portion. However, the skirt portions other than the locking portion 15 provided at the approximate center and the rear end are substantially eliminated.

As shown in FIG. 2, when the front core 10 is mounted on a safety shoe 20, the front sole 21 and the upper
And the lower end is joined to the midsole 23 and further held by the shoe sole 24.

As shown in FIG. 3, such a safety shoe 10 has an inner sole 23 and a back sole 21 covered with a last 30 and the upper 22 other than the front end portion is fitted to the last 30 and fished. The leading core 10 is put on in this state (see FIG. 3B). Next, the entire upper shell 22 is fished, so that the
And, the front and back 21 are covered, and the end is joined to the midsole 23. FIG.
(C) shows the lifting state of the upper 22, and finally the sole 2.
4 are joined.

In such a safety shoe 20, since the front core 10 has substantially no skirt portion, even if the midsole 23 is pushed up when a load is applied, the skirt portion does not expand the wall portion, and the inside of the shoe is not expanded. The space is not reduced. In addition, since the locking portion 15 is provided, integrity with the upper 22 and the back 21 is maintained, and rattling of the front core 10 when worn is prevented.

(Embodiment 2) FIG. 4 shows the structure of the leading core of this embodiment.

According to JIS T8101, the width of the lower bent portion of the front core of the safety shoe, that is, the so-called skirt portion is specified to be 3 mm or more. Therefore, in order to satisfy this standard, the skirt portion may be provided at a minimum and the locking portion may be further provided. FIG. 4 shows such a leading core 10A.

The leading core 10A is provided with a skirt portion 14 having a width of about 3 mm, and further provided with locking portions 15 at the center and the rear end of the leading end.

In such a leading core 10A, a minimum skirt portion 14 that satisfies the JIS standard is provided so that the skirt portion is substantially absent. The part does not spread the wall, so that the space in the shoe does not decrease, and by providing the locking part 15, the integrity with the upper 22 and the front and back 21 is maintained, This has the effect of preventing rattling of the leading core 10 when worn.

(Embodiment 3) FIG. 5 shows the structure of the leading core of this embodiment.

The leading core 10B of the present embodiment has a skirt 1
4A, the strength of which is smaller than the strength of the rear end 11a of the upper surface 11. That is, in the present embodiment, the thickness of the skirt portion 14A is smaller than that of the rear end portion 11a, and the skirt portion 14A has low strength.

With this structure, it is possible to prevent sinking when attached to the safety shoes, and to prevent the skirt portion 14A from rising even when the insole rises when the load portion is lowered.
However, troubles such as pushing the side wall of the shoe outward are less likely to occur.

As described above, in order to make the skirt lower in strength than the rear end of the upper surface, the skirt may be formed of another low-strength material.
It is preferable to make it thin.

Further, such a configuration in which the skirt portion has a low strength may be combined with the configuration of the first and second embodiments, and in this case, a synergistic effect is exhibited.

[0038]

As described above, according to the present invention,
It has good wearability when mounted on safety shoes, etc., and prevents the volume in the shoes from being reduced due to the rise of the insole due to the application of load, and is excellent in pressure resistance and impact resistance and safety using this. Shoes can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view, a transverse sectional view, a vertical sectional view, and a rear view of a leading core according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a safety shoe in which a toe is attached to an embodiment of the present invention.

FIG. 3 is a view showing an assembling process of the safety shoe according to the embodiment of the present invention.

FIG. 4 is a perspective view, a cross-sectional view, a vertical cross-sectional view, and a rear view of a leading core according to another embodiment of the present invention.

FIG. 5 is a perspective view, a transverse sectional view, a vertical sectional view, and a rear view of a leading core according to another embodiment of the present invention.

FIG. 6 is a view showing a defect of a leading core according to the related art.

[Explanation of symbols]

 10, 10A, 10B Lead core 11 Top surface part 12 Tip part 13 Side surface part 14, 14A Skirt part 15 Locking part

Claims (6)

[Claims] 1. A front core made of a fiber-reinforced plastic, wherein a skirt portion, which is a bent portion on a lower side, is substantially eliminated except that at least a locking portion is left at a front end portion and a rear end portion. 2. The skirt according to claim 1, wherein the width of the skirt is minimized, and at least a leading end and a rear end of the skirt are provided with a partially wide locking portion. Lead. 3. A front core made of fiber reinforced plastic, wherein the strength of a skirt portion, which is a bent portion on the lower side, is smaller than the strength of a rear end portion of an arch. 4. The leading core according to claim 3, wherein the thickness of the skirt is smaller than the thickness of the rear end of the arch. 5. The skirt according to claim 3, wherein the width of the skirt is minimized and a wide locking portion is provided at a front end and a rear end of the skirt. Lead. 6. A safety shoe equipped with the tip of any one of claims 1 to 5.