Golf club head

Inactive Publication Date: 2012-12-20
BRIDGESTONE SPORTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]According to the present invention, the C-shaped outer peripheral portion having the opening on the side of the hosel is provided on the internal surface of the face portion. Then, the intermediate portion located on the central side relative to the outer peripheral portion is divided into four areas with at least four main ribs extending from the central portion to the outer edge of the face portion. The thicknesses of the toe side area and the heel side area in the intermediate portion are defined to be greater than the thickness of the outer peripheral portion. The thicknesses of the crown side area and the sole side area in the intermediate portion are defined to be less than the thickness of the outer peripheral portion. Consequently, with a current trend of reducing the weight of the face portion maintained, the strength of the face portion can be secured and the resilience property of the face can be held within a range complying with the golf rules. Furthermore, even if a ball is hit off the face center, a substantially uniform resilience property can be exerted.

Problems solved by technology

However, it has been officially determined that the high-restitution heads whose coefficient of restitution is 0.830 or more cannot be used in a game from 2008 onward.

Method used

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examples

[0055]A golf club head according to the present invention was manufactured and the coefficient of restitution (COR) of its face portion was evaluated. In this embodiment, a characteristic time (CT) was measured instead of measuring the COR value actually. The CT value is a quantitative value capable of measuring the spring effect of the face adopted by the United States Golf Association (USGA) and the Royal and Ancient Golf Club of St. Andrews (R&A) and can be measured with a portable pendulum machine approved by the R&A Rules Limited. Generally, the more the face is deflected, the less energy is lost and the initial velocity of a ball is higher. Thus, the CT value indicates the deflection with a contact time between the ball and the face. Currently, the upper limit of the CT value is defined to be 257 (defined value of 239+allowance of 18) μseconds.

[0056]As the golf club head of this example, the configuration shown in FIG. 2 was adopted. That is, by providing four main ribs and tw...

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PUM

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Abstract

A golf club head having a hollow internal structure, of which a face portion includes, on its internal surface, an intersection portion located in the central portion of the face portion, a C-shaped outer peripheral portion having an opening on the side of a hosel portion, four main ribs extending from the intersection portion up to an outer edge of the face portion, and an intermediate portion located between the intermediate portion and the outer peripheral portion and the hosel portion. The intermediate portion is divided to four areas by the four main ribs. The thicknesses of a toe side area and a heel side area are greater than the thickness of the outer peripheral portion, and the thicknesses of a crown side area and a sole side area are less than the thickness of the outer peripheral portion.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This Application claims priority from Japanese Patent Application No. 2011-132441 filed Jun. 14, 2011, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to a golf club head, more particularly to a golf club head which has an improvement by being providing with a back surface thereof with a thick portion.[0003]In most of recently marketed wood club heads, at least a face portion thereof is formed of metallic material. The face portion needs to be so thick as to maintain strength capable of withstanding an impact when a ball is hit. Although currently the size of the head has tended to be increased, large heads of 460 cm3, which is near the upper official limit stipulated by golf rules, have taken most of the share of marketed driver heads because the driver head must be formed in a volume smaller than 460 cm3+allowance of 10 cm3.[0004]If the head size is so expanded, the...

Claims

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Application Information

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IPC IPC(8): A63B53/00A63B53/04A63B102/32
CPCA63B2053/0454A63B53/0466A63B2053/0408A63B60/00A63B53/0408A63B53/0454
InventorWADA, KOZUEMATSUNAGA, HIDEO
OwnerBRIDGESTONE SPORTS