Game improvement golf club using hollow technology

• US 20040023729A1
• Filed: 07/31/2002
• Published: 02/05/2004
• Est. Priority Date: 07/31/2002
• Status: Active Grant

• Current Assignee: Mizuno Corporation
• Original Assignee: Mizuno Corporation
• Inventors: Nagai, Masao, Llewellyn, David G.
• Granted Patent: US 6,855,069 B2
• Time in Patent Office: Days
• US Class Current: 473/338
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/047 iron-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 head comprising of a top, a sole, a toe, a heel, a front plate having a front and rear side, and an extended back portion integral with the sole and the rear side defining a cavity wherein the extended back portion is integral with the rear side between the top and the sole of the golf club head.

Claims

1. A golf club head comprising:

a top, a sole, a toe, a heel, a front plate having a front and rear side, and an extended back portion integral with said sole and said rear side defining a hollow interior wherein said extended back portion is integral with said rear side between said top and said sole of the golf club head.

2. The golf club head of claim 1 wherein said front plate has a reinforced striking area.

3. The golf club head of claim 1 wherein said hollow interior has a first side wall in communication with said sole between said heel and said toe and a second side wall in communication with said sole between said first side wall and said toe.

4. The golf club of claim 3 wherein a heel weighting element is carried by said rear side between said first side wall and said heel and a toe weighting element is carried by said rear side wall between second side wall and said toe.

5. The golf club of claim 3 wherein said hollow interior has walls that define a trapezoid-like shape.

6. The golf club of claim 1 having a perimeter weighting element carried by said rear side.

7. A method of manufacture of a golf club head including the steps of casting of a primary body wherein said primary body has an extended back portion integral with a front plate having a front side and a rear side which defines an open cavity wherein said open cavity has a top wall disposed between a top and a sole of the golf club head which abuts said rear side of the front plate, manufacturing a sole component, and attaching said sole component to said primary body to incase said open cavity.

8. The method of manufacture of claim 7 wherein said sole component is attached to said primary body by welding.

9. The method of manufacture of claim 7 wherein said front plate has a reinforced striking area.

10. The method of manufacture of claim 7 wherein said open cavity has a first side wall in communication with said sole between said heel and said toe and a second side wall in communication with said sole between said first side wall and said toe.

11. The method of manufacture of claim 10 wherein a heel weighting element is carried by said rear side between said first side wall and said heel and a toe weighting element is carried by said rear side wall between second side wall and said toe.

12. The method of manufacture of claim 10 wherein said open cavity has walls that define a trapezoid-like shape.

13. The golf club of claim 7 having a perimeter weighting element carried by said rear side.

14. A golf club head comprising:

a top, a sole, a toe, a heel, a front plate having a front and rear side, and an extended back portion integral with said sole and said rear side defining a hollow interior wherein said extended back portion is integral with said rear side between said top and said sole of the golf club head, wherein said front plate has a reinforced striking area, and wherein said hollow interior has a first side wall in communication with said sole between said heel and said toe and a second side wall in communication with said sole between said first side wall and said toe.