JP2602929Y2 - Injection molded shoe sole - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded shoe sole suitable for cold boots, boots, etc., and exhibits a sufficient slip prevention function without damaging the floor surface indoors and on a frozen road surface outdoors. The present invention relates to an injection-molded shoe sole suitable for winterization boots, boots, and the like.

[0002]

2. Description of the Related Art In recent years, injection molded shoes whose soles are integrally formed by injection molding of a thermoplastic synthetic resin have become widespread in shoes for various uses, such as winter boots and boots worn in winter or cold regions. This injection molded shoe is widespread.

[0003] The above-mentioned winter boots and the like are worn exclusively for walking on snowy roads or frozen roads, and need to have a sufficient slip prevention function. Therefore, conventionally, a metal spike of a folding type or a detachable type has been generally mounted on the ground surface of the shoe sole to cope with this.

[0004]

[Problems to be solved by the invention] However, considering the place of citizen's life, it is common to wear winter boots and the like as they are inside a semi-public building such as a hospital or a department store.
By the way, indoor floors such as hospitals and department stores are increasingly using soft flooring materials such as vinyl, and the above-mentioned winter boots or the like to which metal spikes are attached may damage the floors. Because of this, before actually going indoors,
The spike had to be folded or removed, which was cumbersome for the wearer.

However, as described in Japanese Utility Model Laid-Open Publication No. 58-14701, which was previously proposed by the applicant of the present invention, shock absorption,
If the engaging member having anti-slip property is attached to the shoe sole contact surface, even if it is a soft floor surface, it will not be damaged, but this engaging member can exhibit anti-slip property on a dry road surface or a wet road surface. However, there is a possibility that the slip prevention function on a frozen road surface or the like cannot be sufficiently exerted.

The present invention has been proposed in order to solve such a problem, and can exhibit a sufficient slip prevention function on an outdoor frozen road surface without damaging a soft floor surface indoors. Moreover, an object of the present invention is to provide an injection-molded shoe sole capable of continuously maintaining the floor surface protection function and the slip prevention function.

[0007]

In order to achieve the above object, an injection-molded shoe sole of the present invention is made of a thermoplastic synthetic resin having a hardness higher than that of the sole contact surface, and maintains flexibility at least at indoor temperature. A non-slip chip integrally formed with a spike-like projection that hardens at a temperature below freezing is detachably embedded at a required position on the shoe sole contact surface, and the spike-like protrusion faces the shoe sole contact surface.

Here, as the thermoplastic synthetic resin forming the slip-proof chip, for example, a styrene resin, a vinyl chloride resin, an olefin resin, a polyester resin, a polyamide resin, a urethane resin or the like can be used.

The vinyl chloride resins include vinyl chloride homopolymers and copolymers thereof, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylate copolymer. , Vinyl chloride / acrylonitrile copolymer, ethylene / chloride beer copolymer, propylene / vinyl chloride copolymer and the like can be selected.

The anti-slip tip may have any shape and structure as long as it has a spike-like projection facing the sole contact surface and can be attached to and detached from the sole contact surface, such as a circle, a triangle, a square, and the like. A pentagonal, hexagonal, or other base plate may have a shape in which several spike-like projections are integrally formed on one surface. In this case, the number of spike-shaped projections can be appropriately selected.

The anti-slip chip can be buried at a required position on the contact surface of the shoe sole, but it is preferable to embed the chip at least on the heel portion of the contact surface of the shoe sole in consideration of a slip prevention function when walking on a frozen road surface. .

Here, the present invention is based on a spring hardness tester type A according to JIS K6301, and the hardness is expressed as follows:
The hardness of the shoe sole body is set in the range of 50 to 70 degrees, the hardness of the anti-slip tip is set in the range of 70 to 90 degrees, and the difference in hardness between the two is set to at least 10 degrees or more.

[0013]

The injection-molded shoe sole of the present invention is particularly suitable for winter boots and the like that are worn exclusively in winter and cold regions, but can also be applied to shoe soles such as walking shoes, trekking shoes, and various sports shoes.

The operation of the cold boot having the injection-molded shoe sole according to the present invention will be described. When walking indoors such as a hospital or a department store, the spike-shaped projection of the slip-proof chip facing the contact surface of the shoe sole is exposed to the indoor temperature (normally). (10 ° C. or higher), so that the floor surface is not damaged even when a soft floor material is used.

On the other hand, when walking on a frozen road surface after snowfall or rainfall, the spike-like projections facing the shoe sole contact surface are hardened by the temperature below the freezing point, and the tips of the hardened spike-like projections are on the surface of the frozen road surface. By digging in, it shows a sufficient anti-slip function.

Further, since the anti-slip chip integrally formed with the spike-shaped projection is detachably embedded at a required position on the contact surface of the shoe sole, it does not fall off carelessly, and when the spike-shaped projection is worn. The floor protection function and the slip prevention function described above are continuously maintained by appropriately changing the floor surface.

Here, the hardness of the sole body is 50 to 70 degrees,
When the hardness of the non-slip tip is in the range of 70 to 90 degrees and the difference in hardness between the two is set to at least 10 degrees or more, the sole body has flexibility and elasticity, and the non-slip tip becomes harder than the sole body. Has shape retention. For this reason, the sole body is easily compressed and deformed by the treading pressure, and the tip of the spike-shaped projection of the anti-slip tip protrudes from the contact surface of the sole of the shoe due to the compressive deformation. In addition, the tip of the spike-like projection can reliably catch the surface of the frozen road surface.

In the present invention, the anti-slip tip is made separately from the sole body. Therefore, in the case of single-color shoes, multicolor shoe soles can be manufactured without using the multicolor injection process, and in the case of multicolor shoes, injection molding of more colors than originally obtained by the multicolor injection process is possible. Can manufacture shoes. Further, since the anti-slip chip can be made the same size for each shoe regardless of the size of the shoe, there is also an advantage that multicolor shoes can be manufactured at lower cost than the original manufacturing cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 2 shows a ground surface 2 of an injection-molded shoe sole 1 made of a vinyl chloride resin, and the ground surface 2 is composed of three portions having different hardnesses, that is, a pair of left and right circular portions corresponding to the base of a toe. It is composed of three parts: a tread portion 2a, a landing portion 2b corresponding to the heel, and a ground contact portion 2c excluding these portions. The ground surface 2 is provided with an appropriate block pattern, a slit pattern, a spike pattern, and the like for obtaining a predetermined grip force and a shock absorbing force according to the purpose, except for the stepped portion 2d.

The injection-molded shoe sole 1 has a sectional structure shown in FIGS. 3A and 3B, and the tread portion 2a has the same hardness and the same color (for example, white) as the main body portion 4 forming the foot contact surface 3. ) Are integrally molded in the same injection stroke. Also,
The landing portion 2b and the grounding portion 2c are integrated with the main body portion 4 by materials having different hardnesses and colors (for example, the landing portion 2b is green and the grounding portion 2c is purple) in different injection strokes.

Here, the hardness based on the spring type hardness tester A type of JIS K6301 is given in parentheses, and the hardness of each part of the injection-molded shoe sole 1 is S (soft), M (medium). , H (hard), the main body portion 4 and the tread portion 2a are formed of S (around 50 degrees) by using a foam material, for example, in order to ensure sufficient cushioning for the foot and grip on the walking surface. Hardness is set.
The hardness of the ground contact portion 2c and the non-stepped portion 2d is set to M (around 55 degrees) in order to secure a grip force on the walking surface. Further, the landing portion 2b is set to a hardness of H (around 60 degrees) in order to secure a shock absorbing force. And these treading part 2a, landing part 2b, ground contact part 2c,
The ground contact surface 2 composed of the stepped portion 2d has a normal indoor temperature (10
(° C. or higher), it retains elasticity without flexibility without damaging flooring materials such as vinyl.

As shown in FIG. 1 in an enlarged manner, a large-diameter circular concave portion 5a opening on the lower surface and an opening of the circular concave portion 5a are formed in the left and right central concave portions of the landing portion 2b corresponding to the heel. A small diameter retaining flange 5b to be squeezed is integrally formed. An anti-slip chip 6 having the shape shown in FIG.

The anti-slip chip 6 has six triangular pyramid projections 6b as spike-shaped projections arranged on one surface of a circular base plate 6a and projecting therefrom. The base plate 6a is attached to and detached from the circular recess 5a. The outer diameter and thickness are set so that they can be embedded freely. With the base plate 6a buried in the circular recess 5a, the tips of the triangular pyramids 6b slightly protrude from the grounding surface of the landing portion 2b.

Here, the dimensional relationship of the anti-slip chip 6 will be described briefly. If the outer diameter of the base plate 6a is too small, the number of the triangular pyramid projections 6b is reduced and sufficient anti-slip performance cannot be secured. Degree is necessary. However, in the case where the number of protrusions of the triangular pyramid projections 6b is increased by increasing the outer diameter indiscriminately, the anti-slip performance is improved, but the load applied to the retaining flange 5b to prevent the base plate 6a from dropping increases accordingly. And
Since the base plate 6a can easily fall off, it should be 50 mm or less. Therefore, the outer diameter of the base plate 6a is preferably set in a range of 15 to 30 mm. If the base plate 6a is too thin, it will bend and easily fall off. If the base plate 6a is too thick, the circular concave portion 5a will be deep, so that the thickness of the main body portion 4 corresponding to this should be made unnecessarily thick. Must. Therefore, this base plate 6a
Is preferably in the range of 3 to 8 mm.

The above-mentioned anti-slip chip 6 is injection-molded in orange using a thermoplastic synthetic resin, for example, a vinyl chloride resin as a material, and has a hardness according to JIS K6301 spring-type hardness tester. In the hardness display based on the A type, the hardness is set in the range of 70 to 90 degrees higher than the hardness (around 60 degrees) of the landing portion 2b by 10 degrees or more. For this reason, each triangular pyramid projection 6b of the anti-slip tip 6 retains elasticity without flexibility at normal indoor temperature (10 ° C. or higher) so as not to damage flooring made of vinyl or the like. It hardens to the extent that it can bite into

Although not shown, in the cross section of the injection-molded shoe sole 1 passing through the aforementioned anti-slip tip 6, the ground contact surface 2 has a so-called concave and convex shape, and the landing surface 2c lands from the contact portion 2c on the outer peripheral portion. The part 2b is slightly dented and the anti-slip tip 6
Is considered so that it does not fall out carelessly.

Next, the operation of the injection-molded shoe sole 1 of the embodiment having the above-described structure will be described. Normally, indoors such as hospitals and department stores are air-conditioned at around 20 ° C. even in winter, and are kept at a temperature of around 10 ° C. even when heating is not effective. Therefore, the injection-molded shoe sole 1 of one embodiment
For example, when walking indoors such as a hospital or a department store while wearing winter boots having the step, the tread portion 2a, the landing portion 2b,
The grounding surface 2 of the injection-molded shoe sole 1 including the grounding portion 2c and the stepped portion 2d, and each of the triangular pyramid protrusions 6b of the anti-slip tip 6 have sufficient elasticity without flexibility, and are made of vinyl or the like. Does not damage soft flooring.

Here, when walking on a frozen road surface after snowfall or rainfall, the landing portion 2b and the grounding portion 2c constituting the grounding surface 2 of the injection-molded shoe sole 1 still retain flexibility. Each of the triangular pyramid projections 6b of the anti-slip tip 6 facing the ground contact surface 2 of the injection-molded shoe sole 1 is set to a hardness of 70 to 90 degrees, and is hardened to the extent that it can bite into a frozen road surface due to a temperature below freezing. Since the anti-slip tip 6 is buried in the landing portion 2b of the grounding surface 2, when walking on a frozen road surface, the grounding portion 2c and the landing portion 2b are slightly elastically deformed at the time of landing. The tip of the triangular pyramid projection 6b can be reliably captured on the surface of the frozen road surface. Thus, a sufficient slip prevention function is exhibited, and the danger of falling on a frozen surface or the like is drastically reduced.

When walking on a frozen road surface, the tread portion 2a whose hardness is set to S (about 50 degrees) grips the surface of the frozen road surface while retaining sufficient flexibility, and is kicked out. In this case, slip is prevented beforehand.

From a structural point of view, the anti-slip chip 6 has a structure in which the base plate 6a is buried in the circular recess 5a and is prevented from being removed by the retaining flange 5b, so that the chip 6 does not fall off carelessly. In addition, since the base plate 6a is detachable due to the elastic deformation of the retaining flange 5b, when the triangular pyramid projection 6b is worn, the anti-slip chip 6 can be replaced as appropriate. The prevention function is continuously maintained.

In this embodiment, the anti-slip tip 6 is arranged only on the landing portion 2b on the ground contact surface 2, but the tread portion 2
a may be arranged, and the number of installations is not limited to one, and an appropriate number can be installed.

The base plate 6a of the anti-slip chip 6 is not limited to a circular shape, but can be changed to an appropriate shape such as a triangle, a quadrangle, a pentagon, a hexagon, and the number of protrusions of each triangular pyramid projection 6b is appropriately adjusted. Can be selected. The triangular pyramid projection 6b may be a quadrangular pyramid projection, a conical projection, or a cylindrical projection instead, as long as it is sharp.

Further, the base plate 6 of the anti-slip chip 6
The upper surface of a may be attached to and detached from the bottom surface of the circular concave portion 5a via a magic fastener. In this case, if the thickness is made sufficiently large relative to the outer diameter of the base plate 6a, the retaining flange 5b can be omitted. The attachment / detachment structure of the anti-slip chip 6 may be a screw-in type or a screw-in type.

On the other hand, the base plate 6a of the anti-slip chip 6
The anti-slip tip 6 is provided on the retaining flange 5b for preventing
An appropriate number of slits may be provided in order to facilitate elastic deformation at the time of attachment / detachment.

[0035]

According to the present invention as described above, according to the present invention, at normal indoor temperature, the spike-like projections of the anti-slip tip facing the ground surface as well as the sole surface of the shoe keep the flexibility,
Even if soft flooring material such as vinyl is used, the floor surface is not damaged.

On the other hand, when walking on a frozen road surface after snowfall or rainfall, the tip of the spike-shaped projection facing the shoe sole contact surface hardens due to the temperature below the freezing point and cuts into the surface of the frozen road surface, so that sufficient slip prevention is prevented. Functions can be demonstrated.

Here, since the anti-slip chip integrally formed with the spike-shaped projection is structured to be detachably buried at a required position on the contact surface of the shoe sole, it does not come off accidentally and the spike-shaped projection is worn. In such a case, the floor surface protection function and the slip prevention function can be continuously maintained by appropriately replacing them.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of an injection-molded shoe sole according to an embodiment of the present invention, which is an enlarged cross-sectional view of a portion I in FIG.

FIG. 2 is a front view of a ground contact surface of the injection-molded shoe sole of FIG. 1;

FIG. 3 is a cross-sectional view of the injection-molded shoe sole of FIG.
3 is a sectional view taken along line AA of FIG. 2, and FIG. 3B is a sectional view taken along line BB of FIG. 2.

FIG. 4 is a perspective view of an anti-slip chip according to the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molded shoe sole 2 Grounding surface 2a Tread portion 2b Landing portion 2c Grounding portion 2d Non-stepping portion 3 Footing surface 4 Main body portion 5a Circular concave portion 5b Retaining flange 6 Slipproof tip 6a Base plate 6b Triangular pyramid projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A43B 13/00-13/42 A43C 15/00-15/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A non-slip tip made of a thermoplastic synthetic resin having a higher hardness than a ground contact surface of a shoe and having a spike-like projection integrally formed, which maintains flexibility at least at an indoor temperature and hardens at a temperature below freezing. a injection molding shoe sole with embedded detachably in the required position of the ground plane becomes to face the spike-like projections on the sole ground surface, the hardness of the sole body and slip tip, JIS K6
With a hardness based on the spring type hardness tester A type 301,
The hardness of the sole body is 50 to 70 degrees, and the hardness of the anti-slip tip is 7
0-90 degrees, and the hardness difference between the two is at least
An injection-molded shoe sole characterized by being at least 10 degrees .