Iron golf club

a golf club and iron technology, applied in golf clubs, golf, sport apparatus, etc., can solve the problems of inability to make the edge sharpening of the groove substantially impossible, restricted improvement applied to the surface of the face of the golf club, etc., to and reduce the vertical moment of inertia

Inactive Publication Date: 2009-01-22
ENDO MFG COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0040]Nineteenthly, the head has means for configuring a hollow body having a cavity on the inside, and for a weight for reducing the vertical moment of inertia to be disposed in the vicinity of the center of gravity of the head, and for the above-mentioned cavity to be formed in a vertically intermediate portion of a part other than the face part.
[0041]Twentiethly, the head has means for configuring a hollow body having a cavity on the inside, and for a weight for reducing the vertical moment of inertia to be disposed in the vicinity of the center of gravity of the head, and for the above-mentioned cavity to be formed in a vertically intermediate portion of the face part.
[0042]Twenty-firstly, the head has means for a weight for reducing the vertical moment of inertia to be disposed in the vicinity of the center of gravity of the head, and for forming a groove in a vertically intermediate portion, and furthermore, for forming a hollow body, which is a cavity, on the inside of the sole part side of the lower portion of this groove.
[00...

Problems solved by technology

As mentioned above, improvements applied to the score lines of the surface of the face of a golf club will be restricted in the future, and an improvement designed to make the groove edges sharper will be sub...

Method used

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embodiment 1

[0126]Next, tests were carried out to show the effect of an embodiment of the present invention. The golf club head used in the tests was related to the iron head shown in FIGS. 32 and 33, and the results of the test hits using the first through the third embodiments are shown in Table 1. In this example, the length (L) of the hosel part was 54 mm, and an iron head, which, with the exception of the sole part, did not have a built-up thickness on the back side, that is, had a plate-shaped face, was used. The configuration was such that the weight 70 of FIG. 32 was affixed as surplus thickness to this plate-shaped face at the location of the center of gravity, and this weight weighed 100 g. The first through the third embodiments changed the moment of inertia by gradually changing the location of this weight. The respective moments of inertia ranged from 715 g·cm2 to 770 g·cm2. The score lines were formed using a press.

[0127]In the comparative example, the moment of inertia using the ...

embodiment 2

[0128]This is an embodiment of golf clubs related to the iron heads shown in FIGS. 20 and 21, and the results of test hits at X through W of the face part shown in FIG. 36 are shown in Table 2. In this example, the thickness of the face at the slit part was 2 mm, the slit width was 1.5 mm, and the depth of the slit from the bottom surface of the sole was 30 mm. The test-hit locations are at right angles to the score lines as shown in the figure, and treating the location of the center of gravity G as the boundary, prescribe the top part side locations as X and Y, and the sole part side locations as Z and W.

[0129]The respective test-hit locations are at the same locations in the toe-heel direction, and are positioned 5 mm apart between the top part and the sole part. As a result, the data in Table 2 below demonstrates that the coefficient of rebound figures at the location of the center of gravity boundary and on the sole part side of this boundary were higher than those of the prior...

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PUM

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Abstract

An iron golf club for enhancing the gear effect and accelerating backspin of a ball. The head, which comprises a face part having a ball-hitting surface, a sole part having a ground-contact plane in the bottom portion of the head, a top part, and a hosel part, is configured such that the rigidity on the ground-contact plane side of the bottom portion is lowered by either providing the portion with a cavity or changing its material. Further, the vertical moment of inertia of the head is reduced by disposing a weight in the location of the center of gravity of the head. When the length of the hosel part is 50 mm or longer, the value of the moment of inertia becomes less than 800 g·cm2, and when the length of the hosel part is less than 50 mm, the value of the moment of inertia becomes 750 g·cm2 or less. These configurations realize a golf club that enhances the gear effect and accelerates spin of a ball.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an iron golf club that enhances the gear effect, and more particularly to an iron golf club that lowers the rigidity of the sole portion of the head, reduces the head moment of inertia, enhances the gear effect, and accelerates ball spin.[0003]2. Description of the Related Art[0004]Various improvements have been made to the golf club over time for enabling stable shots to thereby increase carry and hit the ball to a precise location. In particular, iron-type golf clubs include, for example, a pitching wedge or sand wedge. These iron-type golf clubs, as a rule, are constituted such that the pitch of the face is predetermined, and a sole surface is provided in the lower portion relative to a face surface, which is the ball-hitting surface, and are golf clubs used when ball-hitting accuracy is demanded in particular.[0005]A variety of iron golf club structures have been proposed, and a play...

Claims

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Application Information

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IPC IPC(8): A63B53/02A63B53/04A63B102/32
CPCA63B53/047A63B53/0475A63B2053/0408A63B2053/0416A63B2053/042A63B2209/00A63B2053/0458A63B2053/0433A63B2053/0479A63B53/042A63B53/0458A63B53/0408A63B53/0416A63B53/0433
Inventor SHIBATA, MASAKISAKAI, TOMOYUKI
Owner ENDO MFG COMPANY
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