Golf club and method for manufacturing same

Abstract

The inner circumference of the receiving portion is tapered so as to allow the width thereof to be gradually wider from a bottom portion toward an aperture portion thereof. The outer circumference of the face member is tapered so as to allow the width thereof to be substantially equal to that of the aperture portion and gradually wider from a rear portion toward a front portion thereof. The depth of the receiving portion is defined so as to be slightly larger than the thickness between the front portion and the rear portion. By fitting the face member into the receiving portion in a manner dropping into receiving portion, the face member and the receiving portion can be accurately fitted with each other without a gap at a comparatively low cost even if their dimensional accuracies are low.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a golf club and a method for manufacturing the same. [0003] 2. Description of the Related Art [0004] As a conventional technique, Japanese Unexamined Patent Publication No. 11-4922 discloses a golf club which has a head body, the head body is made from, for instance, soft iron such as S20C, titanium, titanium alloy, wherein a weight which is made from tungsten alloy, stainless steel, copper alloy, etc., is fitted into the head body or a piece which is made from titanium, aluminum etc., is fitted into a face thereof. [0005] Recently, in order to obtain a high-performance golf club by setting a more difference in specific gravity, one which has a weight made from tungsten alloy fitted thereinto has been marketed. In general, a tungsten-alloy-made piece is made by sintering, but it has little ductility, and thus a plastic deformation thereof by caulking itself is difficult. Accordingly,...

AI Technical Summary

Benefits of technology

[0008] The present invention has been made to solve those problems. It is, accordingly, an object of the present invention to provide a golf club having a head made from a plurality of metallic members, the head comprising: one member concavely formed with a receiving portion thereon; and the other member fitted into the receiving portion so as to be integrated with each other, wherein the golf club enables the reduction of as much machining cost as possible and have no gap.

Problems solved by technology

In general, a tungsten-alloy-made piece is made by sintering, but it has little ductility, and thus a plastic deformation thereof by caulking itself is difficult.

However, since tungsten alloy contracts about 20%, a dimensional accuracy thereof is to be rough, and thus machining at a machining center or the like is required.

However, no matter how much machining accuracy is improved, a slight gap is unavoidably created since there is a tolerance in machining between the head body and the tungsten-alloy-made piece.

Moreover, machining cost is expensive.

Further, even though a caulking is applied to the head body, it is still difficult to prevent the creation of the gap when dimensional accuracy is not high.

The slightest gap can cause various problems.

For instance, joining strength is to be inferior, misalignment is caused when hitting a golf ball, and a separation of the tungsten-alloy-made piece is resulted from that misalignment at worst.

Moreover, a polishing agent used for buffing or the like enters the gap and it may ooze later on.

It often results in defective plating.

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