Golf club

• US 20040121852A1
• Filed: 05/02/2003
• Published: 06/24/2004
• Est. Priority Date: 12/20/2002
• Status: Active Grant

• Current Assignee: K.K. Endo Seisakusho
• Original Assignee: K.K. Endo Seisakusho
• Inventors: Tsurumaki, Masaei
• Granted Patent: US 6,887,165 B2
• Time in Patent Office: Days
• US Class Current: 473/344
• CPC Class Codes: A63B 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0412 Volume
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type

Abstract

An object of the present invention is to provide a golf club in which carry does not deteriorate even when a golf ball is struck in a lower position on a face portion. In a golf club constituted by a face portion 4 having a hitting surface, a sole portion 3 which forms a lower portion, and a crown portion 5 which forms an upper portion, the sole portion 3 of a driver club head 1 is improved. A deformation portion B which is capable of elastic deformation is provided in concavoconvex form on the sole portion 3 in a position near the face portion 4. This deformation portion B is constituted by a protrusion 10 which is formed such that the sole portion 3 forms an obtuse angle α, and a concave groove 11 which is formed in a direction linking a toe portion and a heel portion by a protrusion protruding towards the crown portion 5. In order to increase hitting distance, restitution in a lower position on the face portion is increased.

Claims

1. A golf club comprising:

a face portion disposed on the front face of a metallic hollow golf club head and having a hitting surface for hitting a golf ball;

a sole portion which forms the lower portion of said metallic hollow golf club head;

a crown portion which forms the upper portion of said metallic hollow golf club head; and

a deformation portion disposed on said sole portion which is capable of elastic deformation when a golf ball is struck.

2. The golf club according to claim 1, wherein said deformation portion comprises at least one concave groove formed in a direction linking a toe portion and a heel portion by a protrusion protruding towards said crown portion.

3. The golf club according to claim 1, wherein said deformation portion comprises at least one convex portion formed in the direction linking the toe portion and the heel portion by a protrusion protruding towards said crown portion.

4. The golf club according to claim 2 or claim 3, wherein said deformation portion is disposed on the side of said face portion.

5. The golf club according to claim 1, wherein said deformation portion comprises a protruding part which protrudes such that said sole portion is formed in an obtuse angle, in continuation with said hitting surface and said face portion, as viewed in a cross section cut along a vertical plane including a perpendicular to said hitting surface in order to enhance an elastic effect.

6. The golf club according to claim 5, wherein said protruding part comprises at least one concave groove formed in the direction linking the toe portion and the heel portion by a protrusion protruding towards said crown portion.

7. The golf club according to claim 6, wherein said concave groove is disposed on the side of said face portion.

8. The golf club according to claim 5, wherein said protruding part comprises at least one convex portion formed in the direction linking the toe portion and the heel portion by a hollow recessed towards said crown portion.

9. The golf club according to claim 8, wherein said convex portion is disposed on the side of said face portion.