JP3929439B2 - Spike shoes sole - Google Patents

Description

  The present invention relates to a spike shoe sole used for soccer or the like.

Generally, materials currently used in spike shoes have a problem that those with good wear resistance have a relatively high specific gravity, while those with a relatively low specific gravity have a poor wear resistance. The following patent documents can be cited as shoes that have studs having wear resistance and are lightened.
Japanese Patent No. 3392395 (FIG. 3) Japanese Patent Laid-Open No. 62-161301 (Fig. 2) JP 2002-306207 (FIG. 2, 0013)

  In the shoes of Patent Documents 1 and 2, the stud part and the other part (base) of the sole are formed of different materials. However, in the shoe of Patent Document 1, the base is formed of rubber or urethane resin, and the sole cannot be sufficiently lightened. The shoe of Patent Document 2 has an adhesive layer between the stud and the base, and accordingly, the sole becomes heavy or the productivity is lowered.

  In the shoe of Patent Document 3, the stud is formed in a cup shape in cross section. However, in this shoe, since the base is integrally formed of the same highly wear-resistant material as the stud, this becomes a factor that hinders the weight reduction of the sole.

Therefore, a main object of the present invention is to provide a sole capable of reducing the weight of the sole while maintaining the wear resistance of the sole.
Another object of the present invention is to provide a sole excellent in moldability.

In order to achieve the above object, the sole of the present invention is a sole of a spike shoe in which a plurality of studs are provided on a base of a front foot portion and a rear foot portion of the sole, respectively, and each of the bases is upward in a cup shape in cross section. A plurality of cup portions having openings and a plate-like plate portion are formed continuously with a first thermoplastic resin (hereinafter referred to as “first resin”) , and an outer peripheral surface and a front end surface of the cup portion. A stud surface layer portion that covers the stud surface portion and an elongated connecting portion that connects the stud surface layer portions to each other are connected to each other by a second thermoplastic resin (hereinafter referred to as “second resin”) , and the second resin Is set to be higher than the wear resistance of the first resin, and the specific gravity of the first resin is set to be smaller than the specific gravity of the second resin. Cup part made of resin Under the surface of and plate portion, the second upper surface of the stud surface portion and connecting portions formed by the resin, without using an adhesive, are formed integrally with each other.

According to the present invention, since the stud surface layer portion is formed of a resin having higher wear resistance than the base, the wear resistance of the sole is increased. Moreover, the weight of the sole can be reduced by forming the base with a resin having a specific gravity smaller than that of the stud surface layer portion.
In particular, the second resin having a large specific gravity forms the surface layer portion of the stud, and the core portion of the stud is formed of the first resin having a small specific gravity so that the weight of the sole can be reduced. .
On the other hand, since the stud surface layer portion and the base are integrally formed without using an adhesive, it is possible to reduce the weight of the sole and improve the flexibility of the sole. Furthermore, since the process of apply | coating an adhesive agent at the time of manufacture becomes unnecessary, manufacturability improves.
In particular, since the stud surface layer portions are integrated with each other with a long and narrow connecting portion, the manufacturability is improved as compared with the case where each stud is individually molded during the production.

As the first resin used in the present invention, for example, a polyamide having a relatively small specific gravity can be used. As such polyamide, for example, E47S3, E55K1, PEBAX (registered trademark) 5533, and PEBAX (registered trademark) 6333 manufactured by Daicel Tegusa Corporation can be used.
On the other hand, as the second resin, for example, polyurethane having relatively high wear resistance can be used. As such polyurethane, for example, E62K1 manufactured by DOW, USA can be used.
If the resin exemplified above is used as the first and second resins, the stud surface layer portion can be integrally formed on the base without using an adhesive.
In the present invention, the specific gravity of the first resin is preferably set to 1.07 or less, more preferably 1.05 or less, and the specific gravity of the second resin is preferably 1.20 or less, more preferably. Is set to 1.15 or less.

In the present invention, it is preferable that the cup portion has a bottom portion and an annular portion, and the both portions are formed with a substantially constant thickness.
As a result, sink marks are less likely to occur in the cup portion during molding, and moldability is improved. Furthermore, since the uniform pressure is applied to the first resin at the portion of the cup portion that contacts the stud surface layer portion during molding, the reliability of bonding is improved.

Here, “the bottom part and the annular part are formed with a substantially constant thickness” means that at least the thickness of the bottom part is substantially uniform and the thickness of a part of the annular part rising from the bottom part is It is generally uniform.
The uniform thickness is preferably set to 1.0 mm to 3.0 mm, more preferably 1.2 mm to 2.5 mm, and most preferably 1.2 mm to 2.0 mm. If the size is too large, the weight of the sole increases. If the size is too small, the sole is easily damaged.

Furthermore, in a further preferred embodiment of the present invention, the longitudinal section of the plate portion is tapered so that the thickness gradually increases toward the center of the cup portion at the periphery of the stud surface layer portion. Having a tapered portion.
Here, “the thickness gradually increases gradually toward the center of the cup portion” means that the thickness increases as the plate portion approaches the cup portion at least at the periphery of the cup portion, and the tapered portion. The case where the upper surface is formed in a planar shape and is formed in a round shape on the lower surface is included.

In this case, when the base is molded, the molten resin flows smoothly from the taper portion toward the cup portion.
Furthermore, since the cup portion is reinforced by the taper portion, the deflection of the cup portion is reduced, so that it is less likely to feel “push-up” when landing.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show the sole of this embodiment.
As shown in FIG. 1, the sole of the spike shoe of this embodiment includes bases 11 and 12 for the front foot and the rear foot, and a plate-like shank portion 6 is installed between the bases 11 and 12. Yes. The bases 11 and ₁₂ are provided with substantially frustoconical studs S _{1 to} S ₈ and S _{9 to} S ₁₂ , respectively.

As shown in FIG. 2, the base 11 of the forefoot portion includes a plate portion 2 and a cup portion 3. Although not shown, the base 12 of the rear foot also includes the plate portion 2 and the cup portion 3 as in the case of the front foot. The plate part 2 is formed in a plate shape. The cup part 3 is formed at a position corresponding to each stud S _i , and has a cross-sectional cup shape with an upper opening, whereby the stud S _i is hollow. The plate part 2 and the cup part 3 are integrally formed of a polyamide resin (an example of a first resin).

  As shown in FIG. 3A, the cup portion 3 includes a bottom portion 34 provided at a position directly below the opening 100 and an annular portion 35 that rises upward from the bottom portion 34 and continues. The bottom portion 34 and the annular portion 35 are formed with a substantially uniform thickness.

  The stud surface layer portion 4 covers the outer peripheral surface 32 and the front end surface 33 of the lower portion of each cup portion 3. Each stud surface layer portion 4 is formed in a cross-sectional cup shape corresponding to the shape of the cup portion, and has, for example, a substantially circular ground surface 43 (FIG. 3B). The bottom portion 44 of each stud surface layer portion 4 is formed to be thicker than the bottom portion 34 of the cup portion 3. As shown in FIG. 1, each stud surface layer portion 4 is integrally connected by a strip-like elongated connecting portion 5.

  As shown in FIG. 3A, the plate portion 2 has a peripheral edge portion 23 at the peripheral edge of the cup portion 3, and the peripheral edge portion 23 is covered with the stud surface layer portion 4. The peripheral edge portion 23 has a taper portion 24, and the taper portion 24 is formed in a tapered shape in a longitudinal section so that the thickness gradually increases toward the center O of the cup portion 3. .

  The stud surface layer portion 4 and the connecting portion 5 are integrally formed of polyurethane resin (an example of a second resin). The polyurethane resin of this example has higher wear resistance than the polyamide resin constituting the bases 11 and 12, and the specific gravity is higher than that of the polyamide resin.

  As shown in the schematic cross-sectional view of FIG. 5B, the stud surface layer portion 4 formed of the polyurethane resin is formed on the lower surface 36 of the cup portion 3 and the lower surface 25 of the plate portion 2 formed of the polyamide resin. The upper surface 42 is integrally joined without using an adhesive. Similarly, the upper surface 55 of the connecting portion 5 in FIG. 3A is integrally joined to the lower surface 25 of the plate portion 2 without using an adhesive.

The JISD hardness of the stud surface layer portion 4 and the connecting portion 5 is set smaller than the JISD hardness of the base. Thus, when the hardness of the stud surface layer portion 4 is small, when the sand or gravel comes into contact with the surface layer portion 4, the stud surface layer portion 4 is deformed according to these foreign matters, and the stud surface layer portion 4 is scraped off. Therefore, it is possible to improve the wear resistance of the ground contact surface 43 of the stud surface layer portion 4.
The JISD hardness of the bases 11 and 12 is preferably set to about 45 ° to 55 °. This is because if it is too soft, it lacks rigidity, and if it is too hard, it lacks flexibility. The JISD hardness of the stud surface layer portion 4 and the connecting portion 5 is preferably set to about 40 ° to 50 °. This is because if it is too soft, it lacks stability, and if it is too hard, it lacks wear resistance.

  Here, when an impact load F (FIG. 3A) is applied to the ground contact surface at the time of landing, the upper surface 26 of the plate portion 2 and the upper surface 37 of the cup portion 3 will be bent as indicated by a two-dot chain line M. And In the case of the present embodiment, since the plate portion 2 has the tapered portion 24 at the peripheral edge portion 26, the rigidity of the plate portion 2 at the peripheral edge of the cup portion 3 is increased. As a result, the amount of deflection Δ of the plate portion 2 and the cup portion 3 is reduced, and the feeling of “push-up” is reduced when landing.

  As shown in FIG. 2, the shank portion 6 is joined at the front end portion 6f so as to overlap with the rear end portion 21 of the plate portion 2 of the base 11 of the front foot portion, and similarly at the rear end portion 6b. The rear end portion 22 of the plate portion 2 of the base 12 of the rear foot portion is overlapped and joined.

  The shank portion 6 is formed of a hard polyamide resin (an example of a third resin) having the same main polymer and affinity as the polyamide resin forming the plate portion 2. By adopting such a resin, the shank portion 6 and the plate portion 2 are integrally joined without using an adhesive. In addition, a main polymer means a polymer with the largest compounding quantity (weight%) among the polymers mix | blended.

  The JISD hardness of the shank portion 6 is set to a value larger than the JISD hardness of the bases 11 and 12. As a result, the rigidity of the step portion can be increased, the twist of the shoe can be prevented, and the shank portion 6 can be formed thin, so that the weight of the sole can be reduced. In addition, as JISD hardness of the shank part 6, it is preferable to set to about 55 degrees-65 degrees.

Manufacturing method of sole:
Next, a method for manufacturing the above-described sole will be described with reference to FIGS.
First, as shown in FIG. 5 (a), the polyurethane resin is injected into a gap formed between the first mold A and the second mold B, and the forefoot part shown in FIG. 4 (a) and The stud surface layer part 4 and the connecting part 5 of the rear foot part are molded.

  Next, as shown in FIGS. 5B and 6, the bases 11 and 12 are formed on the upper surface side of the first mold A on which the molded stud surface layer portion 4 and the connecting portion 5 are arranged. A third mold C is installed. By pouring the heated and melted polyamide resin 101 into the first gap portion 70 corresponding to the bases 11 and 12 between the two molds, as shown in FIG. 4B, the stud surface layer portion 4 and the connecting portion 5 The bases 11 and 12 are integrally formed.

  That is, the upper surface 42 of each stud surface layer portion 4 and the connecting portion 5 is melted by the heated and melted polyamide resin, whereby the upper surface 42 of each stud surface layer portion 4 and the connecting portion 5 becomes the plate portion 2 and The bases 11 and 12 are welded to the lower surfaces 25 and 36 of the cup portion 3, and the stud surface layer portions 4 and the connecting portions 5 are integrally formed (FIGS. 4B and 5B).

Here, as described above, since the bottom portion 34 and the annular portion 35 of the cup portion 3 are formed with a substantially uniform thickness (FIG. 3A), the cup portion 3 has no thick portion. Even if the heated polyamide resin is cooled and solidified, sink marks hardly occur.
Further, since the bottom 34 of the cup portion 3 has a uniform thickness and is provided with the taper portion 24, the flow of the pressurized molten resin becomes smooth so that the molten resin becomes the upper surface of the stud surface layer portion 4. Since the contact is made evenly and with a large contact pressure, the polyamide resin is bonded to the upper surface 42 of the stud surface layer portion 4 with a strong adhesive force.

  Next, the 4th metal mold | die D for shape | molding the said shank part 6 of FIG.5 (c) is prepared, and the upper surface of the 1st metal mold | die A which has arrange | positioned the bases 11 and 12, the stud surface layer part 4, and the connection part 5. The fourth mold D is installed on the side. As shown in FIG. 4 (c), by pouring a hard polyamide resin (an example of a third resin) that is heated and melted into the second gap portion 102 corresponding to the shank portion 6 between both molds, 11 and 12 are welded to the front end portion 6f and the rear end portion 6b of the shank portion 6, respectively, to obtain a molded product in which the stud surface layer portion 5 and the shank portion 6 are integrally joined to the bases 11 and 12. it can.

That is, the rear end portion 21 of the base 11 of the forefoot portion and the front end portion 22 of the base 12 of the rear foot portion are brought into contact with and melted with the heat-melted hard polyamide resin. The rear end portion 21 is welded to the front end portion 6f of the shank portion 6, the front end portion 22 of the base 12 is welded to the rear end portion 6b of the shank portion 6, and the bases 11 and 12 and the shank portion 6 are integrated. It is formed (FIGS. 4C and 5C).
The sole is created through the above steps.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the present invention may be applied only to a part of the stud of the sole, or the thickness of the stud surface layer part or the cup part may be changed depending on the position of the stud.
In addition, it is not always necessary to provide a tapered portion at the peripheral portion, and the peripheral portion may be formed with a uniform thickness.
Further, the shank portion may be formed integrally with the base with the same resin as the base.
Further, a lateral groove may be formed in the base so that the base is easily bent according to the movement of the sole.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention.

  The present invention can be applied to soccer shoes, rugby shoes, and other spiked shoes for American football.

It is a schematic perspective view of the sole concerning one Example of this invention. It is an end view of the sole along the longitudinal direction. (A) is an enlarged longitudinal sectional view of the sole near the stud S ₈ , and (b) is a bottom view thereof. (A)-(c) is a bottom view which shows the manufacturing process of a sole. (A)-(c) is a conceptual sectional drawing which shows the manufacturing process of a sole. It is a longitudinal cross-sectional view of the stud part which shows the state which poured resin into the metal mold | die.

Explanation of symbols

Base: 11,12
Board part: 2
Rear end of forefoot: 21
Front end of hind legs: 22
Peripheral part: 23
Tapered part: 24
Lower surface: 25
Cup part: 3
Outer peripheral surface: 32
Tip surface: 33
Bottom: 34
Annular part: 35
Lower surface: 36
Stud surface layer: 4
Upper surface: 42
Connecting part: 5
Upper surface: 55
Shank: 6
Front end: 6f
Rear end: 6b
First gap: 70
Second gap: 102
First mold: A
Second mold: B
Third mold: C
4th mold: D
Stud: S _i

Claims (6)

In the sole of the spike shoes in which a plurality of studs are provided on the base of the front foot portion and the rear foot portion of the sole,
Each of the bases is formed of a plurality of cup parts having a cup-shaped cross section and an upper opening and a plate-like plate part connected with the first thermoplastic resin,
A stud surface layer portion that covers the outer peripheral surface and the tip surface of the cup portion and an elongated connection portion that connects the stud surface layer portions to each other are formed continuously with the second thermoplastic resin,
With the wear resistance of the second thermoplastic resin is set higher than the wear resistance of the first thermoplastic resin, the specific gravity of the first thermoplastic resin of the second thermoplastic resin It is set smaller than the specific gravity,
The upper surface of the stud surface layer portion and the connecting portion formed of the second thermoplastic resin on the lower surface of the cup portion and the plate portion formed of the first thermoplastic resin, without an adhesive, The soles of spiked shoes that are integrally formed with each other. In Claim 1, the cup portion has a bottom portion provided at a position directly below the opening and an annular portion that rises upward from the bottom portion and is continuous.
A spike shoe sole in which the bottom portion and the annular portion are formed with a substantially constant thickness.   3. The peripheral part of the plate part that is covered with the stud surface layer part and is located at the peripheral part of the cup part according to claim 1 or 2, so that the thickness gradually increases toward the center of the cup part. A spike shoe sole having a tapered portion with a longitudinal section formed in a tapered shape. In Claim 1, 2 or 3, a plate-like shank portion is provided on the middle foot portion,
The shank portion is formed from a third thermoplastic resin having the same affinity as the first thermoplastic resin and the main polymer,
The front end portion of the shank portion is overlapped with the rear end portion of the base plate portion of the forefoot portion, and is integrally joined without using an adhesive,
The rear end portion of the shank portion is overlapped with the front end portion of the base plate portion of the rear foot portion, and is integrally joined without using an adhesive,
A spike shoe sole in which the JISD hardness of the shank portion is set to a value larger than the JISD hardness of each base. In claim 1, 2, 3 or 4,
The spike shoe sole in which the JISD hardness of each base is set to a value larger than the JISD hardness of the stud surface layer portion. The spike shoe sole according to any one of claims 1 to 5, wherein the first thermoplastic resin is a polyamide resin, and the second thermoplastic resin is a polyurethane resin.

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