JP2001087005A - Tack for soft spike - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tack for a soft spike that has high strength and abrasion resistance and is capable of giving a substantial grip force at the time of being used for spike shoes and the like. SOLUTION: A tack for a soft spike has a spike body comprising a composition having a resin containing reinforced fiber as a main component and a fixing member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf shoe,
The present invention relates to a tack for soft spikes suitably used for spike shoes such as rock shoes.

[0002]

2. Description of the Related Art Metal spikes have been used for spike shoes such as golf shoes and rock shoes.
For example, in golf shoes, shoes in which a plurality of the above-mentioned metal spikes are provided on the bottom surface of the shoe are used in order to secure the stability of the legs during a swing.

However, in recent years, shoes without spikes, that is, shoes using rubber elastic resin for shoe soles, have been used to protect the grass surface of golf courses and asphalt pavement surfaces of roads. Was. Examples of the material include natural rubber and polyurethane elastomer. However, when such a shoe is used, the grip force (slip prevention effect; stability) is insufficient, so that the shoe is unsuitable as a golf shoe. JP-A-2-309901 and JP-A-4-114601 disclose shoe sole materials made of fiber-reinforced rubber (elastomer). Although this sole material has abrasion resistance, it does not provide sufficient gripping power comparable to spike shoes.

On the other hand, so-called soft spikes, which do not use metal as a material for the spike itself but use natural or synthetic rubber, polyurethane or the like as a material, have also been developed. However, these soft spike materials are susceptible to environmental temperatures. For example, rubber-based resin,
Particularly, polyurethane is hard in winter, but is soft and low in summer or under high temperature, so that it is easily worn and has insufficient gripping force when formed into spikes.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to have strength and abrasion resistance comparable to metal spikes, It is an object of the present invention to provide a spike tack for forming a soft spike capable of providing a grip force.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a soft spike stud having a spike body and a fixing member made of a composition containing a resin containing reinforcing fibers as a main component.

In a preferred embodiment, the spike main body is a flat and substantially cylindrical shape having a plurality of projections on one bottom surface, and the reinforcing fibers are substantially radially viewed from the central axis of the cylindrical spike main body, and Near the surface of the side surface of the cylindrical spike main body, it is oriented in the direction of the central axis.

[0008] In a preferred embodiment, the resin is a highly polar resin having rubber elasticity.

In a further preferred embodiment, the reinforcing fibers are at least one short fiber selected from the group consisting of hemp, cotton, silk, and aramid fibers, and the reinforcing fibers are fibrillated. .

[0010] In a preferred embodiment, the reinforcing fiber is contained in the composition at a ratio of 10% by weight to 30% by weight.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The main body of a soft spike tack according to the present invention is made of a composition mainly composed of a resin containing reinforcing fibers. Any resin can be used as long as it has sufficient strength, abrasion resistance, and weather resistance when molded into a spike body and can provide sufficient gripping force. It is. As such a resin, any of a resin having rubber elasticity and a resin having no rubber elasticity can be used. Generally, a resin having rubber elasticity is preferably used in consideration of the purpose of increasing the grip force and protecting a lawn surface or the like. Considering the binding properties of the reinforcing fibers (described later), it is preferable to use a resin having a relatively high polarity. As such a resin,
Acrylonitrile-butadiene rubber (NBR), carboxylated acrylonitrile-butadiene rubber (C-NB
R), polyurethane, natural rubber, chloroprene rubber (C
R), acrylic rubber and the like. In particular, NBR,
C-NBR and polyurethane are preferred, and CR is suitable for applications requiring particularly weather resistance. This resin is contained in the composition constituting the spike body at a ratio of 5 to 30% by weight, preferably 10 to 20% by weight.

As the reinforcing fiber, a fiber that can be fibrillated (single fiber) by kneading with the above resin (described later) is used. As the reinforcing fiber, for example, hemp,
Examples include natural fibers such as cotton and silk, and synthetic fibers. These fibers preferably have a polar group, and aramid fibers are particularly suitable. As aramid fiber,
Kevlar # 29 or Kevlar # 49 manufactured by DuPont. The diameter of the reinforcing fiber is about 3-20.
μm, preferably 3 to 12 μm, and length (when kneading)
Is about 1 to 10 mm, preferably 2 to 5 mm.

The reinforcing fibers may be present in the composition at about 10% to 30% by weight.
% By weight, more preferably 15 to 20% by weight. If the amount of reinforcing fibers is less than about 10% by weight, the resulting spike body tends to be too soft and lack grip. If the amount of the reinforcing fiber exceeds about 30% by weight, the formation of the spike body tends to be difficult, and even if it can be molded successfully, the elasticity of the obtained spike body becomes low, and it was used for spike shoes. In such a case, the problem that the buffering effect is inferior is likely to occur.

The composition for forming the spike body contains, in addition to the above components, fillers such as carbon and silica, and additives such as a plasticizer and a vulcanizing agent, as long as the performance of the soft spike is not impaired. Is also good.

The shape of the spike stud of the present invention is not particularly limited. For example, the spike body can be flat, generally cylindrical, prismatic, and the like. In order to increase the grip force, it is desirable to have a plurality of protrusions on one bottom surface. On the other bottom surface, a fixing member for fixing the spike main body to a target place is attached. The fixing member is
For example, it may be a metal screw or a non-metal screw (for example, a resin screw).

FIG. 1 shows an example of a soft spike stud according to the present invention.
Shown in FIG. 1A is a sectional view of a soft spike stud, and FIG. 1B is a plan view. The soft spike stud 1 has a substantially cylindrical resin spike main body 2, and has a plurality of (here, four) projections 11 on one bottom surface. A fixing member 3 made of a metal screw is mounted on the other bottom surface. The spike body 2 contains substantially fibrillated reinforcing fibers 12. As shown in FIG. 1, the reinforcing fibers are oriented substantially radially when viewed from the central axis of the cylindrical spike main body, and are oriented in the central axis direction near the side surface. That is, the reinforcing fibers are oriented along the outer surface. By orienting the reinforcing fibers in this manner, the spike body itself has sufficient strength and abrasion resistance, and also has a sufficient grip force when used in spike shoes or the like.

The method for producing the soft spike tack of the present invention is not particularly limited. For example, a reinforcing fiber is cut to a predetermined length, and this is cut into a resin for forming a spike body, for example, C-
Knead with NBR. The kneading is performed using an apparatus generally used by those skilled in the art, such as a Banbury mixer. In the course of this kneading, the fibers are opened, possibly cut and fibrillated. Then, for example,
By injecting into a predetermined mold by injection molding, a spike main body is obtained. For example, FIG. 3 shows the spike mold 21 of FIG. This mold 21 is provided with a rubber injection port 2 of a mold at each part 22 corresponding to each projection 11 of the spike main body.
3 and an air vent 24. When the kneaded material is injected from the injection port 23, the opened and fibrillated reinforcing fibers are oriented in the flow direction of the kneaded material indicated by the arrow in FIG. 3, and the reinforcing fibers are moved from the central axis of the cylindrical spike body. As a result, a spike body oriented substantially radially and in the vicinity of the side surface of the cylindrical spike body in the direction of the central axis is obtained.

A fixing member 3 is attached to the obtained spike main body 2.
Is attached by, for example, an adhesive to obtain the tack for soft spikes of the present invention. It is also possible to inject the kneaded material into a mold in which a fixing member is arranged and obtain a tack for soft spike by integral molding. The stud for soft spikes of the present invention can have various shapes depending on the purpose.
For example, FIG. 2 shows another form of soft spike. 2A is a cross-sectional view of the soft spike stud, and FIG. 1B is a plan view.

The main body of the stud for soft spike of the present invention has high strength because it is formed of a composition containing a resin containing reinforcing fibers as a main component. Preferably, the reinforcing fibers are fibrillated as described above. By selecting a resin having a polar group as the resin forming the spike body, the resin and the fibrillated reinforcing fibers are bonded by ionic bonds. For example, as the above resin, C-NBR
And poly-p which is an aramid fiber as a reinforcing fiber
-When phenylene terephthalamide is selected, C-NB
The carboxyl group of R binds to the amino group of the aramid fiber. As a result, the resin body and the reinforcing fibers are firmly bonded. Further, since the fibrillated fibers are oriented in a predetermined direction, the obtained spike body has high abrasion resistance and sufficient tensile strength. Therefore, it is possible to give a sufficient grip force when used in spike shoes or the like.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

Example 1 Kevlar # is used as a reinforcing fiber.
Fifteen parts by weight of 29 yarn chopped fiber (manufactured by DuPont; average fiber diameter 12 μm, average fiber length 5 mm) were prepared. This is carboxylated acrylonitrile-butadiene rubber (Nippol # 1072; Nippon Zeon) 10
In addition to 0 parts by weight, the mixture was thoroughly kneaded with a Banbury mixer to fibrillate the fibers and uniformly disperse them. After adding a vulcanizing agent thereto, transfer molding was performed using a mold shown in FIG. 3 to obtain a spike body having a substantially cylindrical and flat shape and having four projections on one bottom surface. The fibrillated reinforcing fibers are oriented, for example, in the direction of flow of the kneaded material shown at 25 in FIG. 3, and as a result, a spike body having the reinforcing fibers oriented in the directions shown in FIGS. 1a and 1b is obtained.
A fixing tool having a metal screw was attached to the bottom surface of the spike body opposite to the projection with an adhesive to obtain a tack for soft spike.

The performance of the obtained soft spike stud was evaluated. For comparison, a soft spike tack of a comparative example was prepared using the same mold and without adding fibers. The obtained soft spike tack of the present invention was attached to the right foot of a golf shoe, and the soft spike tack of the comparative example was attached to the left foot. After walking for 500 hours and examining the degree of wear, the soft spike tack of the present invention was obtained. The degree of wear was about half that of the comparative example.

Further, the grip at the time of the swing was good, and the feeling of use was exactly the same as that of the spike with a metal stud, and a stable swing was achieved.

[0024]

As described above, according to the present invention, a tack for soft spikes having reinforcing fibers can be obtained. The spike tack has high strength, abrasion resistance and sufficient tensile strength. Therefore, it is possible to give a sufficient grip force when used in spike shoes or the like. Because the spike tack uses resin as the main material of its main body, when used in spike shoes, compared to conventional spikes that use metal as its material, the spike tacks on grassy surfaces of golf courses and asphalt pavement surfaces of roads. Very little damage.

[Brief description of the drawings]

FIG. 1 is a view showing one example of a soft spike tack according to the present invention.

FIG. 2 is a view showing another example of the soft spike stud of the present invention.

FIG. 3 is a view showing a mold for producing a soft spike of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tack for soft spikes 2 Spike main body 3 Fixing member 11 Projection 12 Reinforcing fiber 21 Mold 22 Portion equivalent to projection 11 23 Injection port 24 Air vent 25 Flow of kneaded material

Claims (5)

[Claims] 1. A soft spike stud having a spike body and a fixing member made of a composition containing a resin containing reinforcing fibers as a main component. 2. The spike body has a flat and substantially cylindrical shape having a plurality of projections on one bottom surface, and the reinforcing fibers are substantially radially viewed from a central axis of the cylindrical spike body and the cylindrical spike is provided. The soft spike tack according to claim 1, wherein the tack is oriented in a central axis direction near a surface on a side surface of the main body. 3. The soft spike tack according to claim 1, wherein the resin is a highly polar resin having rubber elasticity. 4. The method according to claim 1, wherein the reinforcing fiber is at least one type of short fiber selected from the group consisting of hemp, cotton, silk, and aramid fiber, and the reinforcing fiber is fibrillated. 3. The stud for soft spike according to any one of 3. 5. The soft spike tack according to claim 1, wherein the reinforcing fiber is contained in the composition in a ratio of 10% by weight to 30% by weight.