IP Library Granted Patent US 8,882,607
Granted Patent B2
US 8,882,607 · App. 13/644,864 · Granted Nov 11, 2014

Golf club

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Quick Facts
Patent No.
US 8,882,607
App. No.
13/644,864
Granted
Nov 11, 2014
Kind
B2
Abstract

Provided is a golf club having a head disposed at a front end of a shaft and a grip disposed at a back end of the shaft. A club weight is not larger than 265 g, and a ratio (head weight/club weight) of a head weight to a club weight is not lower than 0.67 but not higher than 0.75. When a distance from the front end of the shaft to a center of gravity of the shaft is L G and when a full length of the shaft is L S , 0.52≦L G /L S ≦0.65 is satisfied, and when a frequency of flexural vibration of the club is F, 180 cpm≦F≦210 cpm is satisfied.

Claims (24)

1. A golf club having a head disposed at a front end of a shaft and a grip disposed at a back end of the shaft, wherein

a club weight is not larger than 265 g,

a ratio (head weight/club weight) of a head weight to the club weight is not lower than 0.67 but not higher than 0.75,

when a distance from the front end of the shaft to a center of gravity of the shaft is L G and when a full length of the shaft is L S , 0.52≦L G /L S ≦0.65 is satisfied, and

when a frequency of flexural vibration of the club is F, 180 cpm≦F≦210 cpm is satisfied.

2. The golf club according to claim 1 , wherein a club length is not larger than 46 inches.

3. The golf club according to claim 1 , wherein a grip weight is not smaller than 27 g but not larger than 45 g.

4. The golf club according to claim 1 , wherein the club weight is not smaller than 240 g.

5. The golf club according to claim 1 , wherein a club length is not smaller than 42.0 inches but not larger than 46.0 inches.

6. The golf club according to claim 1 , wherein the frequency of the flexural vibration of the club is not lower than 185 cpm but not higher than 205 cpm.

7. The golf club according to claim 1 , wherein the head weight is not smaller than 160 g but not larger than 200 g.

8. The golf club according to claim 1 , wherein the ratio of the head weight to the club weight is not lower than 0.68 but not higher than 0.735.

9. The golf club according to claim 1 , wherein a weight of the grip is not smaller than 30 g but not larger than 41 g.

10. The golf club according to claim 1 , wherein a weight of the shaft is not smaller than 25 g but not larger than 50 g.

11. The golf club according to claim 1 , wherein the shaft length is not smaller than 1050 mm but not larger than 1200 mm.

12. The golf club according to claim 1 , wherein said L G /L S is not lower than 0.53 but not higher than 0.64.

13. The golf club according to claim 1 , wherein a weight of a butt partial layer of the shaft with respect to a weight of the shaft is not smaller than 5 wt % but not larger than 50 wt %.

14. The golf club according to claim 1 , wherein when a weight of a butt partial layer existing in a range from a butt end of the shaft to a point separated from the butt end by 250 mm is represented as Wa, and when a weight of the shaft in said range is represented as Wb, Wa/Wb is not lower than 0.4 but not higher than 0.7.

15. The golf club according to claim 1 , wherein a fiber elastic modulus of a butt partial layer is not lower than 5 t/mm 2 but not higher than 20 t/mm 2 .

16. The golf club according to claim 1 , wherein a resin content of a butt partial layer is not lower than 20 mass % but not higher than 50 mass %.

17. The golf club according to claim 1 , wherein a weight of a butt straight layer is not smaller than 2 g but not larger than 30 g.

18. The golf club according to claim 1 , wherein a weight of a butt straight layer with respect to a weight of the shaft is not smaller than 5 mass % but not larger than 50 mass %.

19. The golf club according to claim 1 , wherein a fiber elastic modulus of a butt straight layer is not lower than 5 t/mm 2 but not higher than 20 t/mm 2 .

20. The golf club according to claim 1 , wherein a resin content of a butt straight layer is not lower than 20 mass % but not higher than 50 mass %.

Assignments (2)
MERGER Recorded Apr 17, 2018
From: DUNLOP SPORTS CO. LTD.
To: SUMITOMO RUBBER INDUSTRIES, LTD.
Reel/Frame 045959/0204 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 9, 2012
From: NAKAMURA, TAKASHI; HASEGAWA, HIROSHI; NAKANO, TAKASHI
To: DUNLOP SPORTS CO. LTD.
Reel/Frame 029096/0136 →