Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
1998-06-09
2001-03-13
Nguyen, Kien T. (Department: 3712)
Games using tangible projectile
Golf
Club or club support
C473S342000, C473S349000
Reexamination Certificate
active
06200228
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a golf club comprising a head with a shaft connected therewith, said head being formed by integrating a plurality of members made of different metal into one piece by fitting the members to one another. The present invention also relates to a method for manufacturing the above-structured golf club.
2. Prior Art
Typically, a golf club consists of a shaft and a clubhead and is normally classified into three types, i.e., wood, iron and putter. Iron club head, for example, is further classified by an angle of a loft (or loft angle). Iron clubs with small loft angles (20 to 30 degrees for example) are called a long iron, while those with large loft angle (40 to 50 degrees for example) a short iron club.
Generally, iron clubs are numbered in sequence from a shorter iron to a longer iron, such as the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, PW (pitching wedge), SW (sand wedge) and LW (lob wedge) in sequence.
A clubhead of an iron club has a face at its front face for hitting a golf ball and a back on its rear face. Some of such backs have cavities, others have smoothed surfaces. Every face has an area named a sweet spot, which is an area on the face that brings about the most satisfactory result when hitting a golf ball.
So-called cavity back irons (iron clubs that have cavities at their backs) have a sweet spot larger than so-called solid back irons (iron clubs whose backs are smoothed surfaces, sometimes called muscle types). On the other hand, solid back irons are advantageous in hitting strong balls, to obtain a comparatively straight travelling of balls that are not influenced by the wind with a good spin.
For iron heads, for example, there is disclosed in paragraphs 0009 and 0011 of Japanese Patent Un-Examined Publication No.8-38657 a golf club head which comprises a head body having a hosel made of metal of the relatively large specific gravity such as steel, beryllium copper alloy or the like, a cavity provided on a back surface of the head body, and a back member made of metal of the relatively small specific gravity such as titanium, aluminum or the like, said back member being pressed into said cavity, so that it is secured to the head body.
According to such conventional art, as the head body and the back member are secured to each other by pressing the latter into the former at a normal temperature, a gap is prone to be produced in a joint surface therebetween, thus resulting in a problem of the deterioration of strength. This is due to the insufficient amount of plastic deformation that would occur when the back member is pressed into the cavity. Therefore, you had to make a thickness of the face member comparatively great, for example as thick as about 3.5 mm to ensure its strength.
SUMMARY OF THE INVENTION
To eliminate the above problems, it is, therefore, an object of the invention to provide a golf club such as an iron golf club whose head is formed by securing different metallic members to one another through plastic deformation, without any gaps between the contact surfaces of the members, thus enabling one to make a face thinner to improve a degree of freedom.
To attain the above object, a gold club head constructed by a plurality of different metallic members integrally fitted one another comprises a head integrated by fitting together a plurality of members each of which being made of different metal and a shaft connected to the head, said members being either a passive fitting member or an active fitting member, wherein the members are fitted together through deformation processing with at least one of the passive and active members being heated to a higher temperature than a normal temperature.
REFERENCES:
patent: 4852880 (1989-08-01), Kobayashi
patent: 5411264 (1995-05-01), Oku
patent: 5522593 (1996-06-01), Kobayashi et al.
patent: 5613917 (1997-03-01), Kobayashi et al.
patent: 5658208 (1997-08-01), Shimasaki
patent: 5749794 (1998-05-01), Kobayashi et al.
patent: 5766091 (1998-06-01), Humphrey et al.
patent: 5774970 (1998-07-01), Huang
patent: 8-38657 (1996-02-01), None
K.K. Endo Seisakusho
Nguyen Kien T.
Quarles & Brady LLP
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