Self-aligning, minimal self-torque golf clubs

• US 6,319,148 B1
• Filed: 10/02/1998
• Issued: 11/20/2001
• Est. Priority Date: 09/15/1998
• Status: Expired due to Fees

• Current Assignee: Leung Tom
• Original Assignee: Leung Tom
• Inventors: Tom, Leung
• Primary Examiner(s): Chapman, Jeanette
• Assistant Examiner(s): BLAU, STEPHEN LUTHER
• Application Number:
  US09/165,337
• Time in Patent Office: 1,145 Days
• Field of Search: 473/314, 473/305, 473/327, 473/328, 473/324, 473/330, 473/331, 473/345, 473/290
• US Class Current: 473/290
• CPC Class Codes: A63B 2225/01 Special aerodynamic features, e.g. airfoil shapes, wings or air passages
• CPC Class Codes: A63B 53/00 Golf clubs
• CPC Class Codes: A63B 53/02 Joint structures between the head and the shaft
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

A self-aligning, low or no self-torque club that is both statically- and dynamically-balanced is provided which is less prone to deleterious effects during its approach to and while striking the ball Static balance is achieved by ensuing the shaft axis intersects the line between the geometric center of the club face and the center of gravity of the club head. The club is self-aligning because the center of gravity naturally follows the shaft and since the shaft and center of gravity are in-line with the face center, the possibility of striking the ball with the club face square increases. By providing a symmetrical and, preferably elliptical face, forces due to air resistance act equally on both sides of the face with respect to the shaft further aligning the club face with the swing path. To further alignment, the club head may also be provided with a series of convergent channels in the direction of air flow over the club. The channels stabilize the club head during downswing and move the center of pressure toward the rear of the club and, preferably, in-line with the center of gravity and the club face. The symmetry of the club head permits, in one embodiment, the same club head to be used for right- or left-handed golfers. Also provided is a set of clubs according to the invention, which due to their similar static and dynamic balance and similar shape and configuration, provide a similar feel and play throughout the entire range of lofts.

Claims

1. A golf club comprising:

a club head having;

an elliptical club face which constitutes the entire frontal area of the club head with respect to the swing direction, said club face being inclined at a predetermined loft angle;

a generally aerodynamic body extending rearwardly of said club face; and

a center of gravity a predetermined distance behind said club face;

a shaft having a shaft axis, said shaft being disposed between the opposite side of the club face and the center of gravity with the shaft axis generally intersecting an imaginary line drawn between the geometric center of the club face and the center of gravity of the club head; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and generally aligned with the direction of air flow over said body during travel of the club in the swing direction, each said channel converging toward the rear of the club head.

2. The golf club of claim 1, wherein said aerodynamic body comprises:

a forward portion extending rearwardly from said club face, said forward portion having substantially the same outer dimensions as the club face;

a rear portion extending rearward of said forward portion, said rear portion terminating in a rounded tail, said rear portion including a top surface, a bottom surface and side surfaces which converge to said rounded tail.

3. The golf club of claim 2, wherein the width of the club face is equal to or less than the length of the club head in the swing direction.

4. The golf club of claim 2, wherein the rear portion includes spoiler means for reducing air resistance during swing.

5. The golf club of claim 2, wherein said plurality of channels are provided in each said top and bottom surfaces.

6. The golf club of claim 5, wherein the plurality of channels on the top surface converges toward the plurality of channels on the bottom surface.

7. The golf club of claim 5, wherein the channels on the top surface converge toward one another and wherein the channels on the bottom surface converge toward one another.

8. The golf club of claim 2, wherein the bottom surface is longitudinally convex.

9. The golf club of claim 2, wherein the top surface is longitudinally concave.

10. The golf club of claim 1, wherein the center of gravity and the geometric center of the club face lie in a horizontal plane.

11. The golf club of claim 1, wherein the center of gravity is lower than the geometric center of the club face.

12. The golf club of claim 1, wherein a plurality of generally concentric, elliptical grooves are provided in said club face.

13. The golf club of claim 1, wherein an end portion of the shaft is disposed between a pair of diametrically opposed tabs extending from an inner side of said club face, said pair of tabs being positioned such that said shaft extends from said club head at a predetermined lie angle.

14. The golf club of claim 1, wherein two pairs of diametrically opposed tabs extend from an inner side of said club face, said shaft having an end portion disposed between the tabs of one of said pairs, said one of said pairs being selected according to whether a user of the golf club is a right-handed shooter or a left-handed shooter, each said pair of tabs being positioned such that said shaft will extend from said club head at a predetermined lie angle.

15. The golf club of claim 1, wherein the club head is longitudinally symmetrical about a vertical plane which extends though the geometric center of the club face.

16. The golf club of claim 1, wherein the shaft is disposed relative to the club face such that substantially equal areas of the club face extend on either side of the shaft.

17. The golf club of claim 1, wherein the shaft is disposed in a tubular shaft receiving member, said shaft receiving member diagonally abutting the inner side of said club face at an angle corresponding to a predetermined lie angle, said shaft receiving member underlying the geometric center of said club face.

18. The golf club of claim 1, wherein the hitting surface of the club face is slightly convex to facilitate the gear effect.

19. The golf club of claim 1, wherein said shaft axis intersects the imaginary line at a location farther from the center of gravity than from the opposite side of the club face.

20. A set of golf clubs comprising a plurality of golf clubs each comprising:

a club head having;

a club face which constitutes the entire frontal area of the club head with respect to the swing direction;

a generally aerodynamic body extending rearwardly of said club face; and

a center of gravity a predetermined distance behind said club face;

a shaft having a shaft axis, said shaft being disposed between the opposite side of the club face and the center of gravity with the shaft axis generally intersecting an imaginary line drawn between the geometric center of the club face and the center of gravity of the club head; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and generally aligned with the direction of air flow over said body during travel of the club in the swing direction, each said channel converging toward the rear of the club head;

wherein a first of said golf clubs has a club face with a predetermined loft angle and wherein each next said golf club has a progressively increasing club face loft angle.

21. A golf club comprising:

a club head having;

a club face which constitutes the entire frontal area of the club head with respect to the swing direction, said club face having a geometric center and being inclined at a predetermined loft angle;

a body extending rearwardly of said club face; and

a center of gravity a predetermined distance behind said club face;

a shaft having a shaft axis, said shaft being disposed between the geometric center of the club face and center of gravity such that the axis of the shaft, the geometric center of the club face and the center of gravity lie substantially in the same plane; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and aligned with the direction of air flow over said body during travel of the club in the swing direction, each said channel converging toward the rear of the club head.

22. The golf club as defined in claim 21, wherein said plurality of channels converges toward the rear of the club head.

23. The golf club of claim 21, wherein the center of gravity and the geometric center of the club face lie in a horizontal plane.

24. The golf club of claim 21, wherein the center of gravity is lower than the geometric center of the club face.

25. The golf club of claim 21, wherein the club face is elliptical and a plurality of generally concentric, elliptical grooves are provided in said club face.

26. The golf club of claim 21, wherein an end portion of the shaft is disposed between a pair of diametrically opposed tabs extending from an inner side of said club face, said pair of tabs being positioned such that said shaft extends from said club head at a predetermined lie angle.

27. The golf club of claim 21, wherein two pairs of diametrically opposed tabs extend from an inner side of said club face, said shaft having an end portion disposed between the tabs of one of said pairs, said one of said pairs being selected according to whether a user of the golf club is a right-handed shooter or a left-handed shooter, each said pair of tabs being positioned such that said shaft will extend from said club head at a predetermined lie angle.

28. The golf club of claim 21, wherein the club head is longitudinally symmetrical about a vertical plane which extends through the geometric center of the club face.

29. The golf club of claim 21, wherein the shaft is disposed relative to the club face such that substantially equal areas of the club face extend on either side of the shaft.

30. The golf club of claim 21, wherein the shaft is disposed in a tubular shaft receiving member, said shaft receiving member diagonally abutting the inner side of said club face at an angle corresponding to a predetermined lie angle, said shaft receiving member underlying the geometric center of said club face.

31. The golf club of claim 21, wherein the hitting surface of the club face is slightly convex to facilitate the gear effect.

32. The golf club of claim 21, wherein the width of the club face is equal to or less than the length of the club head in the swing direction.

33. The golf club of claim 21, wherein the club has a bottom surface which is longitudinally convex.

34. The golf club of claim 21, wherein the club has a top surface having at least a portion thereof being longitudinally concave.

35. The golf club of claim 21, wherein said shaft is disposed farther from the enter of gravity than from the opposite side of the club face.

36. A set of golf clubs comprising a plurality of golf clubs each comprising:

a club head having;

a club face which constitutes the entire frontal area of the club head with respect to the swing direction, said club face having a geometric center;

a body extending rearwardly of said club face; and

a center of gravity a predetermined distance behind said club face;

a shaft having a shaft axis, said shaft being disposed between the geometric center of the club face and center of gravity such that the axis of the shaft, the geometric center of the club face and the center of gravity lie substantially in the same plane; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and aligned with the direction of air flow over said body during travel of the club in the swing direction, each said channel converging toward the rear of the club head,

wherein a first of said golf clubs has a club face with a predetermined loft angle and wherein each next said golf club has a progressively increasing club face loft angle.

37. A golf club comprising:

a club head having;

a club face, said club face being inclined at a predetermined loft angle;

a generally aerodynamic body extending rearwardly of said club face said aerodynamic body comprising;

a forward portion extending rearwardly from said club face said forward portion having substantially the same outer dimensions as the club face; and

a rear portion extending rearward of said forward portion said rear portion terminating in a rounded tail, said rear portion including a top surface a bottom surface and side surfaces which converge to said rounded tail; and

a center of gravity a predetermined distance behind said club face;

a shaft having a shaft axis, said shaft being disposed between the opposite side of the club face and the center of gravity with the shaft axis generally intersecting an imaginary line drawn between the geometric center of the club face and the center of gravity of the club head;

wherein said top and bottom surfaces are each provided with a plurality of channels extending generally in the direction of air flow over the club head during a swing and wherein each said channel converges in the rearward direction to move the center of pressure of the club during travel in its swing direction further back from the club face.

38. The golf club of claim 37, wherein the shaft is disposed relative to the club face such that substantially equal areas of the club face extend on either side of the shaft.

39. The golf club of claim 37, wherein the club face has an elliptical shape.

40. The golf club of claim 39, wherein a plurality of generally concentric, elliptical grooves are provided in said club face.

41. The golf club of claim 37, wherein the hitting surface of the club face is slightly convex to facilitate the gear effect.

42. The golf club of claim 37, wherein the club face constitutes the entire frontal are of the club head in the swing direction.

43. The golf club of claim 37, wherein the width of the club face is equal to or less than the length of the club head in the swing direction.

44. The golf club of claim 37, wherein the rear portion includes spoiler means for reducing air resistance during swing.

45. The golf club of claim 37, wherein the bottom surface is longitudinally convex.

46. The golf club of claim 37, wherein the top surface is longitudinally concave.

47. The golf club of claim 37, wherein the center of gravity and the geometric center of the club face lie in a horizontal plane.

48. The golf club of claim 37, wherein the center of gravity is lower than the geometric center of the club face.

49. The golf club of claim 37, wherein an end portion of the shaft is disposed between a pair of diametrically opposed tabs extending from an inner side of said club face, said pair of tabs being positioned such that said shaft extends from said club head at a predetermined lie angle.

50. The golf club of claim 37, wherein two pairs of diametrically opposed tabs extend from an inner side of said club face, said shaft having an end portion disposed between the tabs of one of said pairs, said one of said pairs being selected according to whether a user of the golf club is a right-handed shooter or a left-handed shooter, each said pair of tabs being positioned such that said shaft will extend from said club head at a predetermined lie angle.

51. The golf club of claim 37, wherein the shaft is disposed in a tubular shaft receiving member, said shaft receiving member diagonally abutting the inner side of said club face at an angle corresponding to a predetermined lie angle, said shaft receiving member underlying the geometric center of said club face.

52. The golf club of claim 37, wherein the plurality of channels on the top surface converges toward the plurality of channels on the bottom surface.

53. The golf club of claim 37, wherein the channels on the top surface converge toward one another and wherein the channels on the bottom surface converge toward one another.

54. The golf club of claim 37, wherein said shaft axis intersects the imaginary line at a location closer to the opposite side of the club face than to the center of gravity.

55. A club head for a golf club comprising:

a club face which constitutes the entire frontal area of the club head with respect to the swing direction, said club face having a geometric center and being inclined at a predetermined loft angle;

a body extending rearwardly of said club face;

a center of gravity a predetermined distance behind said club face; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and aligned with the direction of air flow over said body during travel of the club in the swing direction, each said channel converging toward the rear of the club head.

56. The club head as defined in claim 55, wherein said plurality of channels converges toward the rear of the club head.

57. The club head of claim 55, wherein two pairs of diametrically opposed tabs extend from an inner side of said club face, each said pair of tabs being positioned such that an end portion of a shaft, if positioned between the tabs of one of said pairs, will enable the shaft to extend from said club head at a predetermined lie, said one of said pairs being selected according to whether a user of the golf club is a right-handed shooter or a left-handed shooter.

58. The club head of claim 57, wherein said end portion of said shaft is positionable between said one of said pairs such that the axis of the shaft intersects an imaginary line between the geometric center of the club face and the center of gravity.

59. The club head of claim 55, wherein an end portion of the shaft is disposed between a pair of diametrically opposed tabs extending from an inner side of said club face, said pair of tabs being positioned such if an end portion of a shaft is positioned between said tabs, said shaft will extend from said club head at a predetermined lie angle.

60. The club head of claim 59, wherein said end portion of said shaft is positionable between said tabs such that the axis of the shaft intersects an imaginary line between the geometric center of the club face and the center of gravity.

61. The club head of claim 55, wherein the hitting surface of the club face is slightly convex to facilitate the gear effect.

62. The club head of claim 55, wherein the width of the club face is equal to or less than the length of the club head in the swing direction.

63. The club head of claim 55, wherein the club face has an elliptical shape.

64. The club head of claim 63, wherein a plurality of generally concentric, elliptical grooves are provided in said club face.

65. A club head for a golf club comprising:

a club face which constitutes the entire frontal area of the club head with respect to the swing direction, said club face having a geometric center and being inclined at a predetermined loft angle;

a body extending rearwardly of said club face;

a center of gravity a predetermined distance behind said club face; and

means for moving the center of pressure of the club head during travel of the club in the swing direction rearward of the club face and substantially in-line with the geometric center of the club face and the center of gravity of the club head, said means for moving the center of pressure of the club head comprising a plurality of channels disposed in said body and aligned with the direction of air flow over said body during travel of the club in the swing direction, said plurality of channels converging toward the rear of the club head.