Golf club

• US 6,945,877 B2
• Filed: 02/20/2004
• Issued: 09/20/2005
• Est. Priority Date: 02/24/2003
• Status: Expired due to Fees

• Current Assignee: Kkendo Seisakusho, Seiko S-Yard Company Limited
• Original Assignee: Kkendo Seisakusho, Seiko S-Yard Company Limited
• Inventors: Kobe, Kuniji, Kobayashi, Katsuhiro
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US10/781,633
• Publication Number:
  US 20040166960A1
• Time in Patent Office: 578 Days
• Field of Search: 473324-350, 473290-291, 473/256
• US Class Current: 473/345
• CPC Class Codes: A63B 2053/0491 with added weights, e.g. changeable, replaceable
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: A63B 60/02 Ballast means for adjusting the centre of mass A63B60/24, A63B60/54 take precedence

Abstract

A golf club is provided in which, whether the loft angle is small or large, backspin is reduced and there is no decrease in carry. A golf club construction is obtained wherein, in a driver club head (1) comprising a face section 4 having a striking surface, a sole section (3) forming the bottom, a crown section (2) forming the top and a back section (3a) forming the back portion, when the loft angle is small, the amount of backspin is reduced and performance is maintained, and even when the loft angle is large, the amount of backspin is reduced and a good carry distance is achieved. For this purpose, the crown section (2) is improved, with the provision of a weight (8) on the inside surface thereof nearer to the face section than the center of the surface

Claims

1. A driver golf club comprising:

a face section having striking surface for striking a golf ball arranged at the front face with respect to the striking direction of a hollow metal golf club head;

a sole section forming the bottom of said hollow metal golf club head;

a crown section forming the top of said hollow metal golf club head;

a back section forming the back portion with respect to the striking direction of said hollow metal golf club head;

a toe section forming the front of said hollow metal golf club head; and

a heel section forming the rear of said hollow metal golf club head,

wherein a weight is arranged so as to have a center of gravity near to the face section than a centerline (B) of the width (A) from said face section to the back surface of said crown section, when said golf club is arranged in an address position and projected in the vertical direction,

wherein said weight is arranged in said crown section, being separated from the face section,

wherein the loft angle of said hollow metal golf club head is an angle of 11±

2°

.

2. The driver golf club according to claim 1,

wherein said weight is arranged in a plurality on the inside surface of said crown section.

3. The driver golf club according to claim 1,

wherein the loft angle of said hollow metal golf club head is an angle outside the limited range of allowed values of the coefficient of restitution, and is an angle of more than 15°

.

4. The driver golf club according to claim 1,

wherein said weight is a weight member that is fixed by welding or spray coating on the inside surface of said crown section.

5. The driver golf club according to claim 1,

wherein said weight includes a weight arranged in one or more locations selected from said sole section, said back section, said toe section and said heel section, other than the weight in said crown section.

6. The driver golf club according to claim 5,

wherein said weight comprises weights that are arranged in three locations, namely, said crown section, said sole section and said back section.

7. The driver golf club according to claim 6,

wherein when said width is 70 to 127 mm, said weight is a weight of 5 to 25 g whose center of gravity is arranged in a position separated by 5 to 60 mm from said face section towards said back surface.

8. The driver golf club according to claim 5,

wherein said weight comprises weights that are arranged in three locations, namely, said crown section, said toe section and said heel section.

9. The driver golf club according to claim 8, wherein when said width is 70 to 127 mm, said weight is a weight of 5 to 25 g whose center of gravity is arranged in a position separated by 5 to 60 mm from said face section towards said back surface.

10. The driver golf club according to claim 1,

wherein, when said width is 70 to 127 mm, said weight is a weight of 5 to 25 g whose center of gravity is arranged in a position separated by 5 to 60 mm from said face section towards said back surface.