JP2002065312A - Toe box and shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toe box and a shoe with the toe box which can be manufactured on the same process and in the same design as those of the safety shoe, (non-safety shoes), and which can simplify the manufacturing process as well as reduce a manufacturing cost, and improve properties of a foot touching, a wearing feeling, durability of shoes, and external appearance of shoes, etc. SOLUTION: The toe box which is attached to a front section of the shoe and shaped in one piece with plastic material, comprises a top surface portion 11 covering over toes, a front edge portion 12 arranged in one piece and curved down smoothly from the top surface portion 11, side surface portions 13 covering the both sides of toe section and curved down smoothly from the top surface portion 11, and a skirt portion 14 that is a portion folded inside along the circumferential downside.

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 shoe, which is provided on a toe of a shoe and serves as a spacer at the time of manufacture of a shoe and serves as a leading core in a finished product. It relates to shoes using it.

[0002]

2. Description of the Related Art Conventionally, a toe of a shoe is provided with a leading core to maintain the shape of the last and prevent the shape from being lost due to walking. The front core also has a role of fixing the toes so that the toes do not shift sideways during walking.

Such a leading core has a thickness of 0.5 to 1.2 m.
m, so that when worn, the front surface of the shoe has a step on the surface of the shoe, which not only looks unsightly, but also causes wrinkles at the boundary of the front when walking, which reduces the comfort of the shoe. The rear end must be thin to prevent the appearance of.

Further, in order to maintain the shape of the toe portion of the shoe, it is necessary to form the shoe with a hard material. However, if the shoe is too hard, the toe may come into contact and hurt a finger or a nail. is necessary.

[0005] Further, it is necessary to give elasticity to the front core itself so as to cope with distortion of the shoes during walking.

Under these conditions, the most commonly used for the core is a nonwoven fabric or the like impregnated with a synthetic resin, which is activated by an organic solvent (solvent activated type), A hot-melt adhesive is applied to the front core, and is mainly softened by heating and hardened when cooled (hot melt type).

[0007] On the other hand, there are also steel and hard plastic (safety shoe toe cores) such as safety shoes, which are used to protect the toes from external impact or compression.

Here, a method of manufacturing shoes using each type of tip will be described.

In the case of the solvent activation type, first, a sheet-shaped core material is cut into a predetermined shape, and then, peripheral processing is performed to prevent a step after mounting. Then, the resin component impregnated in the toe core is activated with an organic solvent, and is adhered between the instep cover and the back of the toe in a softened and tacky state, and then squeezed.

[0010] At this time, it is necessary to evaporate the solvent to some extent by drying the core, but if it is dried too much, it hardens, and the stretch of the upper cover is suppressed when fishing, and it is difficult to fish. And it becomes difficult to adhere to the shell.

In addition, if the drying is insufficient, the solvent remains even after fishing, causing insufficient curing to cause deformation of the toe portion and adversely affecting the adhesive for bottoming, resulting in poor adhesion. It may cause or exude to the surface of the upper, causing the surface coating to float or discolor. Therefore, it is necessary to dry and dry the leading core appropriately.

In the hot-melt type, similarly to the above-mentioned solvent-activated type, after cutting a sheet-shaped core material into a predetermined shape, a skiving process is performed to prevent a step. Then, the front core is mounted between the instep cover and the back of the front, and is softened by heating, then fished, cooled, and adhered and solidified.

In this bonding step, a heating step and equipment are required, but bonding can be performed in a shorter step than in the case of a solvent activated type. Further, since no organic solvent is used, it is preferable for safety and health.

Since the safety shoe tip is intended to protect the toes, a high-strength, hard preformed tip such as steel or fiber-reinforced resin is attached between the upper and the back, and fishing is performed as it is. Put in.

Although the mounting of the safety shoe tip does not require an organic solvent and does not require heating, it requires much higher strength than solvent-activated or hot-melt tips. It is necessary to make the core itself as thick as 1 to 5 mm and to devise its shape. Further, it is necessary to cut the last by the thickness of the front core, and to provide a step preventing material at the rear end of the front core.

[0016]

By the way, safety shoes are mainly used in factories and the like for the purpose of protecting the toes from external impact and compression, but are often supplied by the company as part of uniforms. .

However, there are not a few cases where safety shoes are not required even in the same premises as in an office.

In such a case, if safety shoes are used at the manufacturing site and free footwear is used at the office, there is a demand for non-safety shoes of the same design because of complaints and lack of uniformity from the manufacturing site.

The following problems arise when attempting to manufacture non-safety shoes with the same design as the safety shoes.

If the tip of the safety shoe is eliminated, the toe becomes smaller by 1 to 5 mm by the thickness of the tip, so that the foot can be tightly placed and the length and width of the shoe sole do not match. Foreign substances such as garbage tend to accumulate and cause the shoe sole to peel off,
The toe is easily hooked.

Further, in the direct vulcanization press bonding method (VP) or the foamed polyurethane direct method (PUD), a large amount of burrs are generated because a gap is formed between the upper shell and the side mold. This may cause poor appearance.

Further, since there is no one that retains the shape, the shoe becomes a shoe whose tip is depressed, and the wearing comfort is deteriorated.

On the other hand, when trying to attach a solvent activated type or a hot melt type core to shoes, the shape and thickness of these cores and the safety shoe core do not match, and neither the shoe shape nor the shoe sole match. Clearly, a gap is formed between the upper cover and the sole of the shoe, causing burrs, poor adhesion, and poor appearance.

In view of such circumstances, the present invention can manufacture shoes (non-safety shoes) of the same design in the same manufacturing process as safety shoes, and can reduce manufacturing costs and simplify the manufacturing process. An object of the present invention is to provide a toe and a shoe with improved comfort, shoe durability, and shoe appearance.

[0025]

A first aspect of the present invention for solving the above-mentioned problems is a top core provided on a toe portion of a shoe, which is integrally formed of a plastic material and covers an upper portion of the toe. Part, a tip part smoothly bent from the upper surface part and integrally provided, a side part that smoothly bends from the upper surface part to cover both side surfaces of the toe, and a skirt part that is a lower bent part. The tip is characterized by comprising:

In the first embodiment, the front core is integrally formed of a plastic material, so that the foot contact is good and there is no adverse effect on the surface coating of the upper such as a solvent activated type. And plays a leading role in the finished product.

According to a second aspect of the present invention, in the first aspect, the plastic material is a soft resin in the first aspect.

In the second embodiment, since the resin is formed of a soft resin and has elasticity, it can be easily hooked into the bottom surface, and the finished product can have good shape retention and good foot contact.

According to a third aspect of the present invention, in the first or second aspect, the rear end of the upper surface is a thin portion whose thickness gradually decreases toward the rear end. At the forefront.

In the third aspect, by providing the thin portion, it is possible to prevent a step from dropping when the upper is attached without separately attaching a step preventing member.

According to a fourth aspect of the present invention, in the first or the second aspect, the rear end of the upper surface is thinner by an amount corresponding to the thickness of the step preventing material attached to the rear end. At the forefront.

In the fourth aspect, a step can be prevented from being dropped when the upper is attached by attaching a step preventing material to the thin portion with an adhesive or the like.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a bending angle, which is an angle formed between the side surface portion and the skirt portion, is larger than 90 °. In the core.

In the fifth aspect, the same size of the front core can be used for shoes of different sizes.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the edge of the skirt has a plurality of cutouts at an edge thereof.

In the sixth aspect, the notch is provided to prevent the skirt portion from waving in the thickness direction when the side portions are elastically deformed in a direction approaching each other, and the upper cover is swelled on the fishing pad. Can be prevented.

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

In the seventh aspect, the manufacturing process can be shared with the safety shoes while having the function of the leading core of the first to sixth aspects.

[0039]

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

(Embodiment 1) FIG. 1 is a perspective view and a sectional view of a leading core according to Embodiment 1 of the present invention, FIG. 2 is a side view of a shoe with a part cut away, and FIG. It is a figure showing an assembly process.

As shown in the drawing, the toe core 10 has an upper surface 11 having a shape covering the upper part of the toe of the shoe,
The tip 12 which is smoothly bent from 1 and integrally formed
And the side portions 13 on both sides, and the tip portion 12 and the side portion 1
3 and a skirt portion 14 formed to bend inward over the lower side.

Further, inside the rear end of the upper surface 11 of the front core 10, a step preventing member 15 is fixed over the edge by an adhesive or the like so as to protrude from the rear end. The step preventing member 15 is made of cloth or the like, and the upper surface protruding from the rear end of the upper surface portion 11 is substantially flush with the upper surface of the upper surface portion 11 and is thinner at the front end. It is designed to prevent a drop when the vehicle is dropped.

The front core 10 is integrally formed of a plastic material. The plastic material is not particularly limited. For example, it is preferable to use a soft plastic material such as polyvinyl acetate (EVA), polyvinyl chloride (PVC), and polyurethane. When molded with these materials, it has elasticity, so it has good foot contact, can hold the shape of the toe, has a restoring force even if some stress is applied, and has the same shape as the safety shoe front core at the time of shoe production, Since it is thick, it may cause clearance at the tip due to its role as a spacer,
Burrs do not occur, and it is easy to manufacture shoes having the same design as safety shoes. Further, a semi-rigid or rigid plastic material such as polyamide, polyester, polyethylene terephthalate, polycarbonate, ABS, and polypropylene may be used. With such a semi-rigid or hard plastic material, the toes can be protected to a certain extent, and the degree of freedom of the material used is increased.

Since such a leading core 10 does not require solvent immersion and thermal processing, there is no stagnation in the manufacturing process and no bypass is required. Therefore, it can be formed on the same production line as the safety shoes regardless of the production method, and the production cost can be reduced.

FIG. 3 shows a process of manufacturing a shoe using the above-described leading core 10. As shown in FIG. 3, when the front core 10 is attached to a shoe (non-safety shoe) 20, the insole 23 and the front back 21 are put on the last 30, the front back 21 is first suspended, and then the front core After putting on 10 and assembling it in advance, the stomach part and the heel part are pulled in. Then, the bonding surfaces of the upper 22 and the sole 24 are subjected to processing such as raising and application of an adhesive if necessary, and the two are joined to assemble the shoe 20.

Since the shoe 20 thus manufactured has the front core 10 formed of a plastic material, the shape retention and the foot contact can be improved.

In addition, since there is no adverse effect on the surface coating of the upper 22 such as the solvent activated type, the life of the shoe 20 can be extended.

Furthermore, by merely fitting the shoe into the shoe last 30, there is no bending of the front core due to work variation, dubbing, misalignment, etc., and it is possible to improve the assembly accuracy and the yield, and to reduce the organic solvent during the production. Because it is not used, it is safe in terms of hygiene.

(Embodiment 2) FIG. 4 is a perspective view and a sectional view of a leading core according to Embodiment 2.

As shown in FIG. 4, the tip 10 of the present embodiment is
Is the same as that of the above-described first embodiment except that the bending angle θ, which is the angle formed between the skirt portion 14 and the tip portion 12 and the side surface portion 13, is increased.

The bending angle θ of the skirt portion 14 is
There is no particular limitation as long as the elastic deformation of the leading core 10 can be appropriately suppressed, and the angle is preferably 90 ° or more. In the present embodiment, the bending angle θ of the skirt 14 is set to 100 °.

As described above, by increasing the bending angle θ of the skirt portion 14 of the leading core 10, the leading core of the same size can be used for shoes of different sizes, and the shape of the leading core 10 can be reduced. Therefore, the manufacturing cost can be reduced.

(Embodiment 3) FIG. 5 is a sectional view of a leading core according to Embodiment 3 and an enlarged sectional view of a main part.

As shown in FIG. 5A, the leading core 10 of this embodiment does not have the step preventing member 15 at the rear end of the leading core 10 and has a thickness at the rear end of the upper surface 11. Embodiment 4 is the same as Embodiment 1 described above except that a thin portion 11a that gradually decreases toward the rear end is provided.

As described above, the provision of the thin portion 11a on the upper surface portion 11 of the leading core 10 eliminates the need to provide the step preventing member 15 for preventing the stepping of the upper 22 and reduces the manufacturing cost of shoes. And the assembling process can be simplified.

Further, since the clearance on the instep side of the foot is widened, there is an effect that the foot can be easily put into the shoe.

When the step preventing member 15 is provided on the rear end side of the upper surface portion 11, as shown in FIG. 5B, the step preventing member 1 to which the inside of the rear end of the upper surface portion 11 can be attached is provided.
The inner surface may be flush with the thickness of five. In this case, the inner side is made thin, but the outer side may be made thin. As a result, there is no step on both sides, the clearance on the instep side of the foot can be widened, and the foot can be easily put into the shoe.

(Fourth Embodiment) FIG. 6 is a bottom view and a perspective view of a leading core according to a fourth embodiment.

As shown in FIG. 6, the leading core 10 of the present embodiment is
Is the same as that of the above-described first embodiment except that the skirt portion 14 has a plurality of cutout portions 14a opening to the edge.

The notch portion 14a is formed by the skirt portion 14 when the side portions 13 are elastically deformed so as to approach each other.
It is to prevent waving in the thickness direction of
The number and shape are not particularly limited as long as they have such an effect. For example, in the present embodiment, five V-shaped notches 14a are provided on the tip 12 side.

By providing a plurality of notches 14a in the skirt portion 14 of the leading core 10 as described above, the
It is possible to prevent the occurrence of doubling when fishing 2.

(Other Embodiments) The first to fourth embodiments of the present invention have been described above, but the basic structure of the leading core 10 is not limited to the above.

For example, the forehead 10 may be formed by combining the above-described first to fourth embodiments, so that comfortable shoes can be easily manufactured at low cost.

[0064]

As described above, according to the present invention,
By using a plastic molded product as the core for shoes (non-safety shoes), it plays the role of a spacer when manufacturing shoes, and manufactures shoes with the same design as safety shoes on the same line, without burrs or gaps. The finished product can play a leading role. In addition, the shoe (non-safety shoe) manufactured in this manner has a resilient front core, so that it has a restoring force against some external stress and can improve the foot contact. Further, it is possible to prevent the exudation of an organic solvent such as a solvent-activated type from affecting the coating film on the upper cover, and to ensure sanitary safety by the organic solvent and the like.

[Brief description of the drawings]

FIG. 1 is a perspective view and a sectional view of a leading core according to a first embodiment of the present invention.

FIG. 2 is a side view of the shoe according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating an assembling process of the shoe according to the first embodiment of the present invention.

FIG. 4 is a perspective view and a sectional view of a leading core according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a leading core and an enlarged sectional view of a main part according to a third embodiment of the present invention.

FIG. 6 is a bottom view and a perspective view of a leading core according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Front core 11 Top part 12 Top part 13 Side part 14 Skirt part 14a Notch part 15 Step prevention member 20 Shoes (non-safety shoes) 21 Back sole 22 Upper 23 Inner bottom 24 Sole 30 Shoe last

Claims (7)

[Claims] 1. A toe core provided on a toe portion of a shoe, the upper surface portion being integrally formed of a plastic material and covering an upper portion of the toe, and being integrally provided by being smoothly bent from the upper surface portion. A tip core comprising: a tip portion; a side portion that bends smoothly from the upper surface portion to cover both side surfaces of the toe; and a skirt portion that is a bent portion on a lower side. 2. The lead core according to claim 1, wherein the plastic material is a soft resin. 3. The leading core according to claim 1, wherein a rear end portion of the upper surface portion is a thin portion whose thickness gradually decreases toward the rear end. 4. The leading core according to claim 1, wherein a rear end of the upper surface is thinner by an amount corresponding to a thickness of the step preventing material attached to the rear end. . 5. The leading core according to claim 1, wherein a bending angle defined by the side surface and the skirt is greater than 90 °. 6. The leading core according to claim 1, wherein the edge of the skirt has a plurality of cutouts. 7. A shoe equipped with the tip of any one of claims 1 to 6.