Iron golf club head

• US 20050009626A1
• Filed: 05/20/2004
• Published: 01/13/2005
• Est. Priority Date: 07/03/2003
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Yamagishi, Hisashi, Imamoto, Yasunori
• Granted Patent: US 7,232,381 B2
• Time in Patent Office: Days
• US Class Current: 473/338
• CPC Class Codes: A63B 2209/023 Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• 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 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0454 Strengthening ribs on the rear surface of the impact face plate
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 53/0475 with one or more enclosed cavities
• CPC Class Codes: A63B 60/54 with means for damping vibrations

Abstract

An iron golf club head includes a head main body and an FRP body. The head main body includes a face portion, a first face along the face portion, second faces, and a recess behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Claims

1. An iron golf club head comprising:

a head main body including;

a face portion;

a first face along the face portion;

second faces which continue from a rear face of the face portion to the first face; and

a recess behind the head portion, defined by the first face and the second faces;

a hollow FRP body, which is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess, wherein;

at least a part of crossing corner portions between the first face and the second faces has a curved face.

2. The iron golf club head according to claim 1, wherein all of the crossing corner portions have the curved faces.

3. The iron golf club head according to claim 1, wherein curvature radius of the curved face is in a range of from 1.5 mm to 80 mm.

4. The iron golf club head according to claim 1, wherein 80% or more of the crossing corner portions in total length in a circumferential direction have the curved faces.

5. The iron golf club head according to claim 1, wherein the FRP body is formed in the recess by blow molding.

6. The iron golf club head according to claim 1, wherein the opening portion of the recess decreases in area as approaching the rear face of the head main body.

7. The iron golf club head according to claim 1, further comprising:

a resin layer, which has higher specific gravity than the head main body and is disposed on the first face.

8. The iron golf club head according to claim 1, further comprising:

a resin layer, which has higher specific gravity than the head main body and is disposed in lower and rear portion of the recess.

9. The iron golf club head according to claim 7, wherein the resin layer is disposed between the head main body and the FRP body.

10. The iron golf club head according to claim 8, wherein the resin layer is disposed between the head main body and the FRP body.

11. The iron golf club head according to claim 7, wherein the resin layer is embedded in the FRP body.

12. The iron golf club head according to claim 8, wherein the resin layer is embedded in the FRP body.

13. The iron golf club head according to claim 7, wherein the resin layer includes a resin containing metal power having 10 or more in specific gravity.

14. The iron golf club head according to claim 7, wherein the resin layer includes a resin containing metal power having 10 or more in specific gravity.

15. The iron golf club head according to claim 1, further comprising a weight member fixed to a sole portion of the head main body.