JP2014050658A - Spike hardware in baseball shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a spike hardware having a spike tooth with improved wear resistance and secured toughness to lighten the entire spike hardware and improve resistance and grip force when the spike tooth enters the ground.SOLUTION: Forming a spike hardware 10 with lost-wax casting, forging, or metal injection, rather than forming a conventional high-carbon steel plate with a press forming method, allows usage of an alloy tool steel material that could not be used in the press forming method, and increasing a thickness from a tip 12 of a spike tooth 11 to a connection part 14 between the spike tooth 11 and a base plate 13 while reducing a thickness of the base plate 13 except the connection part 14 lightens the entire spike hardware 10.

Description

The present invention relates to a spike fitting provided on the back side of a baseball shoe.

The spikes of baseball shoes require the strength and wear resistance of the spike fitting 1, and a technology that heat-treats high-carbon steel plate material from the substrate part 2 by raising the protrusions from the substrate part 2 into spike teeth 3. Is already a known technology.

However, when bending stress or torsional stress above the yield point of the spike teeth 3 is applied during movement, the spike teeth 3 and the substrate 2 are deformed and broken, so that the wear of the spike teeth 3 can be reduced. In addition, a method of increasing the plate thickness of the high carbon steel is currently taken, but the increase in the weight of the entire spike and the resistance when the spike teeth 3 are incident on the ground increase, resulting in a loss of kinetic energy. And grip force decrease.

Japanese Patent Application No. 2011-100804

In the present invention, the spike metal fitting 1 is not formed of a conventional high carbon steel plate material by the press molding method, but the spike metal fitting 10 is formed by lost wax, forging, or metal injection. An alloy tool steel material or the like which is impossible is made possible, and both the improvement of wear resistance of the spike teeth 11 and the securing of toughness are realized. From the tip 12 of the spike teeth 11, the spike teeth 11 and the substrate 13 While increasing the thickness over the joint portion 14, the thickness of the substrate 13 other than the joint portion 14 is decreased to reduce the overall weight of the spike 10 and improve the resistance and grip force when the spike teeth 11 are incident on the ground. It is the spike metal fitting 10 in the characteristic baseball shoes.

In order to achieve the above object, according to the present invention, the shape 10 of the spike fitting is formed by lost wax, forging, or metal injection, and the thickness from the tip 12 of the spike tooth to the joint 14 of the spike tooth 11 and the substrate 13 is increased. The thickness of the substrate 13 other than the joint portion 14 is decreased while the weight of the spike fitting 10 is reduced, and the resistance and grip force when the spike teeth 11 are incident on the ground are improved.

In addition to the high carbon steel used in the conventional spike fitting 1, the spike fitting 10 can be formed of martensitic stainless steel, alloy tool steel not distributed as a plate material, high-speed tool steel, and chromium molybdenum steel. While maintaining the toughness, it is possible to perform a heat treatment of about HRC 60 higher than the quenching hardness HRC 45 to 50 of the conventional metal fitting 1 and to ensure wear resistance more than twice that of the conventional metal fitting 1. It is characterized by.

As described above, the spike fitting 10 according to the present invention realizes both improvement in wear resistance of the spike teeth 11 and ensuring of toughness, and the spike teeth 11 and the substrate 13 from the tip 12 of the spike teeth 11. The thickness of the substrate 13 other than the joint 14 is decreased while increasing the thickness over the joint 14, thereby reducing the overall weight of the spike 10 and the resistance and grip force when the spike teeth 11 enter the ground. Improvement is possible.

Perspective view of spike fittings for conventional baseball shoes The perspective view of the spike metal fittings of the baseball shoes concerning this invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a conventional spike metal fitting 1, a high carbon steel plate material is formed by press forming, a protruding piece is raised from a substrate portion 2 to form a spike tooth 3, and a bending stress above the yield point of the spike tooth 3. Alternatively, when a torsional stress is applied, the spike teeth 3 and the substrate 2 are deformed and broken, so that heat treatment is performed to improve strength and wear resistance.

The quenching hardness of the spike fitting 1 is about HRC 45-50, but it is difficult to say that the wear resistance is sufficient, and it is required to increase the hardness.

It is generally known that increasing the quenching hardness at the time of the heat treatment is accompanied by a decrease in toughness that causes fatigue failure, and the spike fitting 1 improves both the wear resistance and the toughness. In order to achieve this, the heat treatment for maintaining the quenching hardness of the HRC 45 to 50 is performed using the high carbon steel plate material of 1.6 mm or more.

However, when the plate material of 1.6 mm or more is used, an increase in the weight of the entire spike and a resistance when the spike teeth 3 are incident on the ground increase, resulting in a loss of kinetic energy and a decrease in grip force.

Since the spike metal fitting 1 is formed by the pressing method, in order to reduce the resistance when the spike teeth 3 are incident on the ground and to reduce the weight of the metal fitting 1, It is impossible to change the thickness.

FIG. 2 shows a spike fitting 10 according to the present invention, which is formed by lost wax, forging, or metal injection without using the conventional press molding method. From the tip 12 of the spike tooth 11, the spike tooth 11 and the substrate 12 are shown. The thickness of the substrate 13 other than the joint portion 14 is decreased while increasing the thickness over the joint portion 14 to reduce the weight of the spike fitting 10 as a whole, and resistance and grip force when the spike teeth 11 are incident on the ground. Can be improved.

The spike fitting 10 can be formed of martensitic stainless steel, alloy tool steel, high-speed tool steel, and chrome molybdenum steel in addition to the high carbon steel used in the conventional spike fitting 1.

When formed with the alloy tool steel material, high-speed tool steel material and chromium molybdenum steel material, it is possible to perform a heat treatment of about HRC 60 higher than the quenching hardness HRC 45-50 of the conventional metal fitting 1 while maintaining the toughness. It is generally known that it is possible to ensure wear resistance twice or more that of the conventional metal fitting 1.

Further, in the spike fitting 10, the conventional spike formed by press molding in which the ridge line portions 4 of the plurality of spike teeth 3 raised from the substrate 2 in the conventional spike fitting 1 are combined. The spike teeth 11 that cannot be formed by the metal fitting 1 can be formed, and it is possible to have a gripping force in all directions.

By providing the joint portion 14 of the spike tooth 11 of the spike metal fitting 10 and the substrate 13 with respect to the long side portion 15 of the spike tooth 11,
When bending stress or torsional stress higher than the yield point at the time of movement is applied to the tip 12 of the spike tooth 11, the stress concentration on the joint portion 14 is alleviated, and the spike tooth 11 and the substrate 13 are deformed and broken. It becomes possible to prevent.

DESCRIPTION OF SYMBOLS 1 Conventional spike metal fitting 2 Substrate 3 of spike metal fitting 1 Spike tooth 4 of spike metal fitting 1 Edge line part 10 of spike tooth 3 Spike metal fitting 11 concerning the present invention Spike tooth 12 of spike metal fitting 10 Tip 13 of spike tooth 11 Substrate 14 Joint 15 of Spike Teeth 11 and Substrate 13 Long Side of Spike Teeth 11

Claims (5)

While increasing the thickness from the tip 12 of the spike tooth of the spike fitting 10 to the joint portion 14 of the spike tooth 11 and the substrate 13, the thickness of the substrate 13 other than the joint portion 14 is decreased, and the overall weight of the spike 10 is reduced. A spike fitting in a baseball shoe characterized in that the resistance and grip force when the spike teeth 11 are incident on the ground are improved. The spike fitting for baseball shoes according to claim 1, wherein the shape of the spike fitting (10) is formed as lost wax, forging, or metal injection. 3. The spike fitting 10 is made of high carbon steel, martensitic stainless steel, alloy tool steel not distributed as a plate material, high-speed tool steel, and chrome molybdenum steel. Spike fittings in baseball shoes according to any one of the above. In the spike fitting 10, the ridge line portions 4 of the plurality of spike teeth 3 raised from the substrate 2 are combined to form the spike teeth 11 that cannot be formed by press molding, and grip force is exerted in all directions. The spike metal fitting in the baseball shoes in any one of Claim 1 thru | or 2. 3. The spike teeth 11 of the spike fitting 10 and the joint portion 14 of the substrate 13 are provided at a plurality of positions with respect to a long side portion 15 of the spike teeth 11. A spike fitting in the baseball shoe according to any one of the above.

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