IP Library Granted Patent US 8,998,743
Granted Patent B2
US 8,998,743 · App. 13/644,468 · Granted Apr 7, 2015

Golf club

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Quick Facts
Patent No.
US 8,998,743
App. No.
13/644,468
Granted
Apr 7, 2015
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 290 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 0.72. Furthermore, a grip weight is not smaller than 27 g but not larger than 45 g, and when a distance from the front end of the shaft to a center of gravity the shaft is L G and when a full length of the shaft is L S , 0.54≦L G /L S ≦0.65 is satisfied.

Claims (23)

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 290 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 0.72,

a grip weight is not smaller than 27 g but not larger than 45 g, and

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 , 0.54≦L G /L S ≦0.65 is satisfied,

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 the range is represented as Wb, Wa/Wb is not lower than 0.4 but not higher than 0.7.

2. The golf club according to claim 1 , wherein a shaft weight is not smaller than 30 g but not larger than 58 g.

3. The golf club according to claim 1 , wherein the club weight is not smaller than 265 g but not larger than 290 g.

4. The golf club according to claim 1 , wherein the shaft full length L S is not smaller than 105 cm but not larger than 120 cm.

5. The golf club according to claim 1 , wherein the club weight is not smaller than 265 g.

6. The golf club according to claim 1 , wherein the club weight is not larger than 284 g.

7. The golf club according to claim 1 , a club length is not smaller than 42 inches but not larger than 46.5 inches.

8. The golf club according to claim 1 , wherein the head weight is not smaller than 185 g but not larger than 210 g.

9. 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 0.715.

10. The golf club according to claim 1 , wherein the grip weight is not smaller than 28 g but not larger than 44 g.

11. The golf club according to claim 1 , wherein a shaft weight is not smaller than 34 g but not larger than 53 g.

12. The golf club according to claim 1 , wherein a shaft length is not smaller than 1070 mm but not larger than 1180 mm.

13. The golf club according to claim 1 , wherein when a distance from the front end of the shaft to the center of gravity of the shaft is L G and when a full length of the shaft is L S , 0.56≦L G /L S ≦0.63 is satisfied.

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

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

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

17. 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 .

18. 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 5, 2012
From: NAKAMURA, TAKASHI; HASEGAWA, HIROSHI; NAKANO, TAKASHI
To: DUNLOP SPORTS CO. LTD.
Reel/Frame 029084/0710 →