Hollow golf club head

• US 7,503,853 B2
• Filed: 12/30/2005
• Issued: 03/17/2009
• Est. Priority Date: 08/23/2005
• Status: Expired due to Fees

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Matsunaga, Hideo
• Primary Examiner(s): Kim; Gene
• Assistant Examiner(s): DENNIS, MICHAEL DAVID
• Application Number:
  US11/320,803
• Publication Number:
  US 20070049410A1
• Time in Patent Office: 1,173 Days
• Field of Search: 473/345, 473/329, 473/349
• US Class Current: 473/345
• 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 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/0466 wood-type

Abstract

This invention provides a hollow golf club head having a crown portion and a sole portion. Young'"'"'s modulus of a material among materials of the crown portion which is used in the largest amount is lower than Young'"'"'s modulus of a material among materials of the sole portion which is used in the largest amount.

Claims

1. A hollow golf club head having a face portion, a crown portion and a sole portion, wherein said crown portion includes:

a crown thin-walled region formed on a face side of said crown portion and beginning from an upper end of said face portion; and

a crown thick-walled region formed on a back side of said crown portion,

said sole portion comprising a plurality of sole materials, including a first sole material comprising the largest volume of said sole portion,

the crown thin-walled material is made of a first crown material,

the crown thick-walled material is made of a second crown material, and

a Young'"'"'s modulus of the first crown material is lower than a Young'"'"'s modulus of the second crown material and a Young'"'"'s modulus of the first sole material, and

wherein said sole portion includes;

a sole thick-walled region formed on a face side of said sole portion and made of the first sole material; and

a sole thin-walled region formed on a back side of said sole portion and made of another sole material having a Young'"'"'s modulus which is lower than the Young'"'"'s modulus of the first sole material.

2. The gold club head according to claim 1, wherein the crown thin-walled region comprises the largest volume of said crown portion.

3. The golf club head according to claim 1, wherein a ratio of an average thickness of said sole portion to an average thickness of said crown portion is 1:

0.3 to 1;

0.8.

4. The golf club head according to claim 1, wherein a volume of the golf club head is in a range of 250 cm³ to 470 cm³, and a loft angle of the golf club head is in a range of 7 to 15 degrees.

5. The golf club head according to claim 1, wherein a volume of the golf club head is in a range of 150 cm³ to 250 cm³, and a loft angle of the golf club head is in a range of 12 to 28 degrees.

6. The golf club head according to claim 1, wherein a head volume is in a range of is 70 cm³ to 150 cm³, and a loft angle of the golf club head is in a range of 15 to 32 degrees.

7. The golf club head according to claim 1, wherein the crown thin-walled region extends from a face side end of the crown portion at least 20 mm toward the back side of the crown portion.

8. The golf club head according to claim 1, wherein the sole thick-walled region extends from a face side end of the sole portion at least 20 mm toward the back side of the sole portion.

9. The golf club head according to claim 1, further comprising a side portion,

wherein a thickness of said side portion is the same as a thickness of said crown thin-walled region.