Shoe stud and method for manufacturing shoe stud

Abstract

To increase connection strength between a tip of a shank and a wear resistant tip and increase production speed.SOLUTION: A shoe stud includes: a wear resistant tip 1 having a side face 1c perpendicular to one face 1a and the other face 1b having the same shape; and a shank 2 having a tip provided with a hole part 20 to which the wear resistant tip 1 can be fitted. The wear resistant tip 1 and the shank 2 are joined with resistance welding. The wear resistant tip is softened and expanded by resistance welding and adheres to the hole part of the shank.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a stud for attaching to the sole of sports shoes such as golf shoes and fishing shoes, and work shoes, etc., and a method for manufacturing the stud.

Background Art

[0002] Some studs attached to the soles of sports shoes and work shoes have a wear-resistant tip such as a cemented carbide excellent in wear resistance attached to the tip of the shank in order to extend the life of the stud.

[0003] In a conventional stud, as disclosed in Patent Document 1 for example, the wear-resistant tip is formed of a sphere, and the wear-resistant tip is disposed in a circular hole provided at the tip of the shank, and the stud is manufactured by joining the tip of the shank and the wear-resistant tip by resistance welding.

[0004] However, in this stud, since the wear-resistant tip is formed of a sphere, the bonding strength between the tip of the shank and the wear-resistant tip is weak, and when a strong external force is applied to the wear-resistant tip, the wear-resistant tip may fall off from the shank. Further, when the wear-resistant tip contacts the ground, since the wear-resistant tip is a sphere, it may slip.

[0005] Further, in the stud disclosed in Patent Document 2, the wear-resistant tip is composed of a spherical body with a hemispherical lower half serving as a welding surface and a protruding upper half. A stud enabling uniform resistance welding has been proposed by disposing the hemispherical spherical body at the tip of the shank and performing resistance welding between the tip of the shank and the wear-resistant tip.

[0006] However, in this stud, when disposing the wear-resistant tip at the tip of the shank, since it is necessary to dispose the spherical body of the wear-resistant tip downward at the tip of the shank, there is a problem that it takes time to dispose the wear-resistant tip and the manufacturing speed is slow.

Prior Art Documents

Patent Document

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, the problems to be solved by the present invention are to provide a stud having a high bonding strength between a wear-resistant tip and the tip of a shank, and a method for manufacturing a stud capable of increasing the manufacturing speed.

Means for Solving the Problems

[0009] To solve the above problems, the stud according to the present invention includes: a wear-resistant tip having side surfaces perpendicular to one surface and the other surface of the same shape, and a shank provided with a hole at the tip into which the wear-resistant tip can be fitted, and the wear-resistant tip and the hole of the shank are joined by resistance welding, and the wear-resistant tip is softened and expanded by resistance welding and adheres to the hole of the shank.

[0010] Preferably, the wear-resistant tip is cylindrical.

[0011] Preferably, the hole is cylindrical or frustoconical with a bottom diameter larger than the top diameter.

[0012] In addition, the method for manufacturing a stud according to the present invention includes: a step of preparing a wear-resistant tip having side surfaces perpendicular to one surface and the other surface of the same shape, a step of preparing a shank provided with a hole at the tip into which the wear-resistant tip can be fitted, a step of fitting the wear-resistant tip into the hole of the shank, and A step of joining the wear-resistant tip and the hole portion of the shank by resistance welding, and softening and expanding the wear-resistant tip by resistance welding to attach it to the hole portion of the shank is included.

Effect of the Invention

[0013] The horseshoe nail according to the present invention has a high bonding strength between the wear-resistant tip and the tip of the shank, so that the wear-resistant tip can be prevented from falling off the shank. Further, in the manufacturing method of the horseshoe nail according to the present invention, the wear-resistant tip can be quickly arranged at the tip of the shank, so that the manufacturing speed can be increased.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0015] Hereinafter, based on the drawings, an embodiment of the horseshoe nail and the manufacturing method of the horseshoe nail according to the present invention will be described.

[0016] As shown in Fig. 1, the wear-resistant tip 1 is made of a cylindrical cemented carbide, hardened stainless steel, or the like. One surface 1a and the other surface 1b of the wear-resistant tip 1 are formed as the same circle with a diameter d1. Also, the side surface 1c of the wear-resistant tip 1 extends substantially perpendicular to the one surface 1a and the other surface 1b and is formed with a height h1. And the wear-resistant tip 1 is manufactured, for example, by compression molding a powdered cemented carbide material and sintering it at a high temperature. The wear-resistant tip 1 may also be made of a martensitic stainless steel or tungsten steel that can obtain high strength through heat treatment.

[0017] As shown in Fig. 2, the shank 2 is made of a cylindrical stainless steel, steel, titanium, or the like. The shank 2 is provided with a flange portion 21, and the flange portion 21 is attached to the sole of the shoe so that the tip of the shank 2 disposed on the opposite side of the flange portion 21 faces the ground.

[0018] Also, the shank 2 is provided with a cylindrical hole portion 20 at the tip. The hole portion 20 is composed of a bottom surface 20a with a diameter d2 and a side surface 20b with a depth h2. In this embodiment, the side surface 20b extends perpendicular to the bottom surface 20a. Therefore, the hole portion 20 is formed such that the upper surface is the same circle as the bottom surface 20a. The bottom surface 20a is a flat surface in this embodiment, but it may also be a gently inclined surface with a convex or concave center.

[0019] The hole portion 20 is configured such that d1 < d2 so that the wear-resistant tip 1 can be fitted therein, and is configured such that h1 > h2 so that the wear-resistant tip 1 fitted in the hole portion 20 protrudes from the tip of the shank 2.

[0020] As shown in Fig. 3, in the manufacturing process of the stud, first, the wear-resistant tip 1 is fitted into the hole 20 of the shank 2 (Figs. 3(A) and (B)). Since the wear-resistant tip 1 is cylindrical and one surface 1a and the other surface 1b are the same circle, either one of the one surface 1a and the other surface 1b can be fitted into the hole 20 of the shank 2, and there is no need to select the fitting direction. Therefore, the wear-resistant tip 1 can be quickly fitted into the hole 20 of the shank 2, thereby increasing the manufacturing speed.

[0021] After that, the pressure electrode 3 is pressed against the upper surface 1b of the wear-resistant tip 1, so that the upper surface 1b of the wear-resistant tip 1 becomes the energized surface and current flows, and the wear-resistant tip 1 and the hole 20 of the shank 2 are resistance welded (Fig. 3(C)).

[0022] As shown in Fig. 4(A), when the wear-resistant tip 1 is fitted into the hole 20 of the shank 2 and the wear-resistant tip 1 and the hole 20 of the shank 2 are not resistance welded, one surface 1a of the wear-resistant tip 1 contacts the bottom surface 20a of the hole 20 of the shank 2, and there is a gap between the side surface 1c of the wear-resistant tip 1 and the side surface 20b of the hole 20 of the shank 2.

[0023] As shown in Fig. 4(B), when the wear-resistant tip 1 is fitted into the hole 20 of the shank 2 and the wear-resistant tip 1 and the hole 20 of the shank 2 are resistance welded, one surface 1a of the wear-resistant tip 1 is welded to the bottom surface 20a of the hole 20 of the shank 2, and the energized part side of the side surface 1c of the wear-resistant tip 1 is softened and expanded by the heat of the resistance welding, so that the side surface 1c of the wear-resistant tip 1 and the side surface 20b of the hole 20 of the shank 2 are stuck and crimped. Thereby, the bonding strength between the wear-resistant tip 1 and the hole 20 of the shank 2 can be increased, and even when a strong external force is applied to the wear-resistant tip 1, the wear-resistant tip 1 does not fall off from the shank 2.

[0024] As described above, the preferred embodiments of the present invention have been described, but the configuration of the present invention is not limited to these embodiments.

[0025] As shown in FIG. 5, the hole portion 20 may have a frustoconical shape in which the bottom surface 20a has a larger diameter than the upper surface and the side surface 20b is inclined with respect to the bottom surface 20a. As a result, the side surface 1c of the wear-resistant tip 1 is inclined and crimped along the side surface 20b of the hole portion 20, so that the bonding strength can be increased by wedge bonding, and the wear-resistant tip 1 is prevented from falling off from the shank 2.

[0026] Further, since the wear-resistant tip 1 may have the same shape on one surface 1a and the other surface 1b, it may be polygonal. As a result, either one of the one surface 1a and the other surface 1b of the wear-resistant tip 1 may be fitted into the hole portion 20 of the shank 2, and there is no need to select the fitting direction. Therefore, the wear-resistant tip 1 can be quickly fitted into the hole portion 20 of the shank 2.

[0027] The effects of the present invention will be described.

[0028] The stud according to the present invention includes a wear-resistant tip 1 having a side surface 1c perpendicular to one surface 1a and the other surface 1b having the same shape, and a shank 2 provided with a hole portion 20 into which the wear-resistant tip 1 can be fitted at the tip. The wear-resistant tip 1 and the hole portion 20 of the shank 2 are joined by resistance welding, and the wear-resistant tip is softened and expanded by resistance welding and adhered to the hole portion of the shank.

[0029] The manufacturing method of the stud according to the present invention includes a step of preparing a wear-resistant tip 1 having a side surface 1c perpendicular to one surface 1a and the other surface 1b having the same shape, a step of preparing a shank 2 provided with a hole portion 20 into which the wear-resistant tip 1 can be fitted at the tip, a step of fitting the wear-resistant tip 1 into the hole portion 20 of the shank 2, and a step of joining the wear-resistant tip 1 and the hole portion 20 of the shank 2 by resistance welding to soften and expand the wear-resistant tip by resistance welding and adhere it to the hole portion of the shank.

[0030] The wear-resistant tip 1 has a side surface 1c that is perpendicular to one surface 1a and the other surface 1b of the same shape. Further, the wear-resistant tip 1 and the hole 20 of the shank 2 are joined by resistance welding, and the wear-resistant tip is softened and expanded by resistance welding and adheres to the hole of the shank. Therefore, the joining strength between the wear-resistant tip 1 and the hole 20 of the shank 2 can be increased, and even when a strong external force is applied to the wear-resistant tip 1, the wear-resistant tip 1 does not fall off from the shank 2.

[0031] Also, when fitting the wear-resistant tip 1 into the hole 20 of the shank 2, either one surface 1a or the other surface 1b of the wear-resistant tip 1 can be fitted into the hole 20 of the shank 2, and there is no need to select the fitting direction. Therefore, the wear-resistant tip 1 can be quickly fitted into the hole 20 of the shank 2, thereby increasing the manufacturing speed.

[0032] Preferably, the wear-resistant tip 1 is cylindrical. Thereby, the shape of the wear-resistant tip 1 is simplified, and the wear-resistant tip 1 can be manufactured at high speed and easily.

[0033] Preferably, the hole 20 is cylindrical. Thereby, the shape of the hole 20 is simplified, and the shank 2 can be manufactured at high speed and easily.

[0034] Also, the hole 20 may be in the shape of a frustum of a cone with a bottom surface 20a having a larger diameter than the upper surface. Thereby, the side surface 1c of the wear-resistant tip 1 is inclined and crimped along the side surface 20b of the hole 20, so that the joining strength can be increased by wedge joining, and even when a strong external force is applied to the wear-resistant tip 1, the wear-resistant tip 1 does not fall off from the shank 2.

Explanation of Signs

[0035] 1 Wear-resistant tip 1a One surface of the wear-resistant tip 1b The other surface of the wear-resistant tip 1c Side surface of the wear-resistant tip 2 Shank 20 Hole part 20a Bottom surface of the hole part 20b Side surface of the hole part 3 Pressure electrode

Claims

1. An abrasion-resistant tip having side surfaces perpendicular to one surface and the other surface of the same shape, and a shank provided with a hole at the tip into which the abrasion-resistant tip can be fitted, and the abrasion-resistant tip and the hole of the shank are joined by resistance welding, and the abrasion-resistant tip is softened and expanded by the resistance welding and adhered to the hole of the shank characterizing the stud.

2. The abrasion-resistant tip is cylindrical characterizing the stud according to Claim 1.

3. The hole is cylindrical characterizing the stud according to Claim 1 or 2.

4. The hole is frustoconical with a bottom diameter larger than the top diameter characterizing the stud according to Claim 1 or 2.

5. A step of preparing an abrasion-resistant tip having side surfaces perpendicular to one surface and the other surface of the same shape, a step of preparing a shank provided with a hole at the tip into which the abrasion-resistant tip can be fitted, a step of fitting the abrasion-resistant tip into the hole of the shank, a step of joining the abrasion-resistant tip and the hole of the shank by resistance welding, and softening and expanding the abrasion-resistant tip by the resistance welding to adhere it to the hole of the shank, and characterizing the method for manufacturing a stud.

Images