Vibration damped golf clubs and ball bats

• US 5,759,113 A
• Filed: 06/21/1996
• Issued: 06/02/1998
• Est. Priority Date: 06/21/1996
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Nielsen, Edmond J., Lai, Ming-Lai
• Primary Examiner(s): Graham, Mark S.
• Application Number:
  US08/670,792
• Time in Patent Office: 711 Days
• Field of Search: 473/318, 473/319-322, 473/520
• US Class Current: 473/321
• CPC Class Codes: A63B 2209/02 with reinforcing fibres, e.g. carbon, polyamide fibres
• CPC Class Codes: A63B 53/10 Non-metallic shafts
• CPC Class Codes: A63B 60/06 Handles
• CPC Class Codes: A63B 60/08 characterised by the material
• CPC Class Codes: A63B 60/10 with means for indicating correct holding positions A63B60/12 takes precedence
• CPC Class Codes: A63B 60/48 with corrugated cross-section
• CPC Class Codes: A63B 60/54 with means for damping vibrations

Abstract

The present invention provides novel damped golf clubs and balls bats having at least one non-tubular constrained layer damper attached to the golf club shaft or bat, respectively.

Claims

1. A golf club comprising:

(a) a striking head having a front surface and a back surface, the front surface being the striking surface, the striking head also having a hosel;

(b) a shaft having a first end and a second end, wherein the first end of the shaft is in connection with the hosel of the striking head;

(c) a grip into which the second end of the shaft is inserted;

(d) at least one constrained layer damper attached to the shaft, wherein each constrained layer damper is non-tubular and each constrained layer damper independently comprises;

(i) a non-tubular outer rigid layer,

(ii) a non-tubular outer vibration damping material layer comprising a viscoelastic material attached to one side of the outer rigid layer;

wherein each non-tubular outer rigid layer has a shear modulus at least about 10 times greater than that of the vibration damping material layer(s); and

wherein the constrained layer damper(s) are attached to the shaft in such a manner that the outer vibration damping material layer is adjacent to the shaft;

wherein at least one damper must be positioned on the shaft such that it at least partially falls within one or both of the following degree ranges;

(i) the 1 to 179 degree range;

(ii) the 181 to 359 degree range;

wherein the degree ranges are calculated such that when the club is positioned striking surface down on a flat surface the 90 degree point is the uppermost point on the shaft when viewed in cross section from the direction of the striking head toward the gripping end and the 270 degree point is the lowermost point on the shaft when the shaft is likewise viewed in cross section.

2. The golf club of claim 1 wherein at least one damper must be positioned on the shaft such that (1) at least a 30 degree range total is covered by vibration damping material layer(s) of the damper(s) in the 60 to 120 degree range, or (2) at least a 30 degree range total is covered in the 240 to 300 degree range, or (3) at least a 30 degree range total is covered within the 60 to 120 degree range plus the 240 to 300 degree range.

3. The golf club of claim 1 wherein at least one damper must be positioned on the shaft such that (1) at least a 60 degree range total is covered by vibration damping material layer(s) of the damper(s) in the 60 to 120 degree range, or (2) at least a 60 degree range total is covered in the 240 to 300 degree range, or (3) at least a 60 degree range total is covered within the 60 to 120 degree range plus the 240 to 300 degree range.

4. The golf club of claim 1 wherein each damper is independently positioned along or parallel to a shortest line segment connecting a point on the first end of the shaft to a point on the second end of the shaft at the same degree point on circumference of the shaft.

5. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that at least a portion of the damper falls within an area which is greater than 20 percent the length of the shaft away from the first end of the shaft and greater than 40 percent the length of the shaft from the second end of the shaft.

6. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that all the damper(s) fall entirely within an area which is greater than 20 percent the length of the shaft away from the first end of the shaft and greater than 40 percent the length of the shaft from the second end of the shaft.

7. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that at least a portion of the damper falls within an area which is greater than 25 percent the length of the shaft away from the first end of the shaft and greater than 45 percent the length of the shaft from the second end of the shaft.

8. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that all the damper(s) fall entirely within an area which is greater than 25 percent the length of the shaft away from the first end of the shaft and greater than 45 percent the length of the shaft from the second end of the shaft.

9. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that at least a portion of the damper falls within an area which is greater than 30 percent the length of the shaft away from the first end of the shaft and greater than 50 percent the length of the shaft from the second end of the shaft.

10. The golf club of claim 1 wherein the constrained layer damper(s) are positioned such that all the damper(s) fall entirely within an area which is greater than 30 percent the length of the shaft away from the first end of the shaft and greater than 50 percent the length of the shaft from the second end of the shaft.

11. The golf club of claim 1 wherein the length of each constrained layer damper is about 10 to about 100 percent of the length of the shaft.

12. The golf club of claim 1 having about 1 to about 40 constrained layer dampers.

13. The golf club of claim 1 having about 2 to about 20 constrained layer dampers.

14. The golf club of claim 1 having about 2 to about 8 constrained layer dampers.

15. The golf club of claim 1 wherein the constrained layer damper(s) are attached to an internal surface of the shaft.

16. The golf club of claim 1 wherein the constrained layer damper(s) are attached to an external surface of the shaft.

17. The golf club of claim 16 wherein the constrained layer damper(s) are attached to indentations(s) in the external surface of the shaft.

18. The golf club of claim 16 wherein four constrained layer dampers are attached to the shaft such that a longitudinal center line of a first damper is at 0°

, a longitudinal center line of a second damper is at 90°

, a longitudinal center line of a third damper is at 180° and

a longitudinal center line of a fourth damper is at 270°

.

19. The golf club of claim 16 wherein the constrained layer damper(s) are positioned such that the golf club would meet the requirements of the United States Golf Association.

20. The golf club of claim 16 wherein the same degree ranges are covered by two or more separate dampers.