Metal wood golf club head having low center of gravity

• US 6,074,310 A
• Filed: 04/20/1998
• Issued: 06/13/2000
• Est. Priority Date: 04/20/1998
• Status: Expired due to Fees

• Current Assignee: BOST Enterprises Incorporated
• Original Assignee: BOST Enterprises Incorporated
• Inventors: Ota, R. Dean
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US09/063,115
• Time in Patent Office: 785 Days
• Field of Search: 473/345, 473/346, 473/349, 473/290, 473/291, 473/292
• US Class Current: 473/345
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0454 Strengthening ribs on the rear surface of the impact face plate
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

A golf club includes a shaft having at one end a hollow metal wood club head. The club head defines a face, a lower sole portion, an upper portion, and a side wall. The sole portion is generally thicker than the upper portion, and preferably approximately one and one-third to six times as thick. As a result of the thicker construction of the sole portion relative to the upper portion, the center of gravity of the club head is relatively low. The lower center of gravity permits a golfer to more easily swing the face of the club head under a golf ball. In a second embodiment, portions of the side wall are provided with a generally thicker construction relative to the upper portion of the club head. In a third embodiment, the sole portion is made from a material having greater mass per unit area than the upper portion.

Claims

1. A golf club, comprising:

a) a shaft having a first gripping end and a second end; and

b) a hollow metal club head coupled to said second end of said shaft, said club head having a sole portion, an upper portion, a ball striking face, and a side wall provided between said sole portion and said upper portion rearward of said face, wherein said upper portion is comprised of a first thickness of a material and said sole portion is comprised of said material and has at substantially all locations thicknesses greater than said first thickness,

and further wherein said face has a lower central portion and a lower peripheral portion, and said sole portion generally comprises a first portion adjacent said lower central portion of said face and having a second thickness, and a second portion adjacent said lower peripheral portion of said face and having a third thickness, said second thickness being greater than said third thickness.

2. A golf club according to claim 1, wherein:

said thickness of said sole portion is one and a third to six times said first thickness.

3. A golf club according to claim 1, wherein:

said face has a lower central portion and a lower peripheral portion, and

said sole portion generally comprises a first portion adjacent said lower central portion of said face and having a second thickness, and a second portion adjacent said lower peripheral portion of said face and having a third thickness,

said second thickness being greater than said third thickness.

4. A golf club according to claim 1, wherein:

said second thickness is approximately two to five times said first thickness, and

said third thickness is approximately one and a third to three times said first thickness.

5. A golf club according to claim 4, wherein:

said first thickness is approximately 1 millimeter, said second thickness is approximately 2 to 6 millimeters, and said third thickness is approximately 1.33 to 3 millimeters.

6. A golf club according to claim 1, wherein:

said face has a thickness approximately three to four times said first thickness.

7. A golf club according to claim 1, wherein:

said club head defines a toe portion and a heel portion, said toe and heel portions are comprised of second and third thicknesses, respectively, of said material, said second and third thicknesses being greater than said first thickness.

8. A golf club according to claim 1, wherein:

said material comprises stainless steel.

9. A golf club according to claim 8, wherein:

said upper portion, said face and said side wall comprise a first piece of said material and said sole portion comprises a second piece of said material welded to said first piece of material.

10. A hollow metal wood club head for a golf club shaft, comprising:

a sole portion, an upper portion, a ball striking face, and a side wall provided between said sole portion and said upper portion rearward of said face, wherein said upper portion is comprised of a first thickness of a material and said sole portion is comprised of said material and has at substantially all locations thicknesses greater than said first thickness,

and further wherein said face has a lower central portion and a lower peripheral portion, and said sole portion generally comprises a first portion adjacent said lower central portion of said face and having a second thickness, and a second portion adjacent said lower peripheral portion of said face and having a third thickness, said second thickness being greater than said third thickness.

11. A hollow metal wood club head according to claim 10, wherein:

said thickness of said sole portion is one and a third to six times said first thickness.

12. A hollow metal wood club head according to claim 10, wherein:

said face has a lower central portion and a lower peripheral portion, and

said sole portion generally comprises a first portion adjacent said lower central portion of said face and having a second thickness, and a second portion adjacent said lower peripheral portion of said face and having a third thickness,

said second thickness being greater than said third thickness.

13. A hollow metal wood club head according to claim 10, wherein:

said second thickness is approximately two to five times said first thickness, and

said third thickness is approximately one and a third to three times said first thickness.

14. A hollow metal wood club head according to claim 10, wherein:

said club head defines a toe portion and a heel portion, said toe and heel portions are comprised of second and third thicknesses, respectively, of said material, said second and third thicknesses being greater than said first thickness.

15. A hollow metal wood club head for a golf club, comprising:

a sole portion having a lowest point, an upper portion having a highest point, a ball striking face, a rear wall opposite said face, a toe portion, a heel portion, and a means for coupling said club head to the golf club,

said club head further having a mass, a height defined by a vertical distance between said highest point and said lowest point, and defining a central plane horizontally extending through a midpoint of said height,

wherein a majority of said mass of said club head is provided below said central planes;

said club head further having a width from said toe portion to said heel portion, said width having a width midpoint, a depth from said face to said rear wall, said depth having a depth midpoint, and a center of gravity,

wherein said center of gravity is located substantially between said depth midpoint and said face and substantially at said width midpoint.

16. A hollow metal wood club head according to claim 15, wherein:

approximately 54 to 60 percent of said mass is provided below said central plane.