Golf club head

Abstract

An iron-type golf club head has a face having a face surface of a flat surface, and a hosel which is continuous with the face on its heel side. A shaft insertion hole is disposed in the hosel. A protrusion protruding rearward in the vicinity of the center in a toe-heel direction is disposed. A material of the golf club head is pure iron having a high purity of at least 99.995%, for instance, a purity within a range of 99.995 to 99.9999%. The golf club head is subjected to carburizing so that carbon diffuses to a range of about 0.2 to 0.5 mm from the surface.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a golf club head, particularly to a golf club head whose face is made of an iron material. More specifically, the invention relates to a golf club head for use in an iron-type golf club. [0003] 2. Description of the Related Art [0004] As a material for an iron-type golf club head, a soft iron, stainless steel, a cupper alloy, and the like, has been used. In addition, an iron golf club head of a composite type whose peripheral edge section is made of stainless steel, and to which a face plate made of a titanium alloy is attached has come into widespread use in recent years. Hereinbelow, an iron-type golf club head is often referred to as an “iron head.”[0005] An iron head made of pure iron whose purity falls within a range of 99.93 to 99.97% is disclosed in JP-A-63-229078. In lines 1 to 8, upper left column, page 3 of the specification, it is disclosed that pure iron has great elongat...

AI Technical Summary

Benefits of technology

[0010] The present invention provides a golf club head which is superior in ball-hit feeling as well as in abrasive resistance.

[0019] Being made of a pure iron material, the golf club head of the invention provides softball-hit feeling. Accordingly, the golf club head is particularly suitable for use in an iron having a loft angle greater than or equal to 25° and from which a soft touch upon hitting of a ball is expected, and further particularly suitable for use in a wedge whose loft angle falls within a range of 400 to 650.

[0020] According to the invention, when purity of an iron material is greater than or equal to 99.8%, ball-hit feeling becomes soft. Accordingly, carbon content is preferably 0.02% or lower. When an iron material having a high purity of 99.995% or higher is employed, ball-hit feeling becomes fairly soft, and stainless property is also improved, which is advantageous.

[0021] According to the invention, a surface of a head made of the pure iron is subjected to carburizing. Accordingly, the head exhibits favorable abrasive resistance.

[0023] Meanwhile, in order to suppress an increase in weight of the iron head, the following is preferable, that is, thickness in the vicinity of the center of gravity of the face is increased while thicknesses of the remaining portions are rendered smaller. More specifically, the face is preferably smaller in thickness on its toe side and on its heel side than in the vicinity of its center of gravity.

Problems solved by technology

However, because of low abrasive resistance, the iron head made of pure iron is easily damaged on its surface, and angular edges of score lines (lateral grooves on a face surface) are rounded at an early stage, thereby making it difficult to impart spin to a hit ball.

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