Golf club head

Abstract

A golf club head has a hollow shell structure comprising: a main frame provided with three independent openings which are a front opening, a top opening and a bottom opening; a face plate covering the front opening; a crown plate covering the top opening; and a sole plate covering the bottom opening. The specific gravity Gc of the crown plate, the specific gravity Gf of the face plate and the specific gravity Gs of the sole plate are each smaller than the specific gravity Gm of the main frame. Preferably, the specific gravity Gc is smaller than the specific gravity Gf and smaller than the specific gravity Gs, and the main frame is made of a metal material. Therefore, the freedom of designing the center of gravity the club head can be increased.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described in detail in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a wood-type golf club head according to the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a cross sectional view taken along line X-X in FIG.2;

FIG. 5 is an exploded perspective view of the club head;

FIGS. 6 and 7 are enlarged cross sectional views for explaining a method for fixing an additional weight member; and

FIG. 8 is an exploded perspective view of a golf club head used as Ref. 2 in the undermentioned comparison tests.

Claims

1. A golf club head having a hollow shell structure comprising: a main frame provided with three independent openings which are a front opening, a top opening and a bottom opening; a face plate covering the front opening; a crown plate covering the top opening; and a sole plate covering the bottom opening, wherein the specific gravity Gc of the crown plate, the specific gravity Gf of the face plate and the specific gravity Gs of the sole plate are each smaller than the specific gravity Gm of the main frame.

2. The golf club head according to claim 1, wherein the specific gravity Gc is smaller than the specific gravity Gf and smaller than the specific gravity Gs.

3. The golf club head according to claim 1, wherein the specific gravity Gm is larger than the specific gravity Gf which is larger than the specific gravity Gs which is larger than the specific gravity Gc.

4. The golf club head according to claim 1, wherein the main frame is made of a metal material.

5. The golf club head according to claim 1, wherein the main frame, the face plate and the sole plate are each made of a metal material, andthe crown plate is made of a fiber reinforced resin.

6. The golf club head according to claim 1, wherein the main frame, the face plate, the sole plate and the crown plate are each made of a metal material.

7. The golf club head according to claim 1, wherein the main frame is made of a titanium alloythe face plate is made of a titanium alloy,the crown plate is made of a magnesium alloy, andthe sole plate is made of an aluminum alloy.

8. The golf club head according to claim 1, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a fiber reinforced resin, and the sole plate is made of an aluminum alloy.

9. The golf club head according to claim 1, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a magnesium alloy andthe sole plate is made of a titanium alloy.

10. The golf club head according to claim 1, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of an aluminum alloy andthe sole plate is made of a magnesium alloy.

11. The golf club head according to claim 1, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a fiber reinforced resin, andthe sole plate is made of a fiber reinforced resin.

12. The golf club head according to claim 2, wherein the main frame is made of a metal material.

13. The golf club head according to claim 2, wherein the main frame, the face plate and the sole plate are each made of a metal material, andthe crown plate is made of a fiber reinforced resin.

14. The golf club head according to claim 2, wherein the main frame, the face plate, the sole plate and the crown plate are each made of a metal material.

15. The golf club head according to claim 2, wherein the main frame is made of a titanium alloythe face plate is made of a titanium alloy,the crown plate is made of a magnesium alloy, andthe sole plate is made of an aluminum alloy.

16. The golf club head according to claim 2, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a fiber reinforced resin, and the sole plate is made of an aluminum alloy.

17. The golf club head according to claim 2, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a magnesium alloy andthe sole plate is made of a titanium alloy.

18. The golf club head according to claim 2, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of an aluminum alloy andthe sole plate is made of a magnesium alloy.

19. The golf club head according to claim 2, wherein the main frame is made of a titanium alloy,the face plate is made of a titanium alloy,the crown plate is made of a fiber reinforced resin, andthe sole plate is made of a fiber reinforced resin.