Hollow golf club head and method for manufacture

• US 6,247,636 B1
• Filed: 02/16/1999
• Issued: 06/19/2001
• Est. Priority Date: 02/16/1999
• Status: Expired due to Fees

• Current Assignee: Cipa Manufacturing Corporation
• Original Assignee: Cipa Manufacturing Corporation
• Inventors: Sun, Donald J. C.
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): EDMONDSON, LYNNE RENEE
• Application Number:
  US09/251,136
• Time in Patent Office: 854 Days
• Field of Search: 228/135, 228/138, 228/175, 273/78, 473/329, 473/345, 473/324
• US Class Current: 228/135
• CPC Class Codes: A63B 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• 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 60/50 with through-holes A63B60/18 takes precedence; for stringing purposes A63B49/00

Abstract

A golf club head is formed from two separate pieces. One of such pieces constitutes the face plate while the other piece constitutes the sole plate and the top crown of the club head. The pieces are welded together to form a hollow shell. The sole plate and the top crown are connected together with a hinge. These hinged pieces are joined in a closed position in a nest die and spot welded together. The face plate is then seam welded to the sole plate and the top crown in an argon chamber to form an integral unit.

Claims

1. A method for forming a golf club head comprising the steps of:

forging a face plate piece;

forging a top crown and sole piece with the top crown and sole being joined together by a bridging hinge;

bringing opposing edges of said top crown and sole piece together in abutment with each other by means of said hinge;

spot welding said top crown and said sole together along said edges to form a shell having an open end; and

seam welding said face plate piece to the open ended shell formed by said top crown and sole piece along the edges of said open end.

2. The method of claim 1 wherein said top crown and sole piece are installed in a nest die prior to spot welding and spot welded in said die.

3. The method of claim 1 wherein prior to the seam welding of said face plate piece to said top crown and sole piece together, said pieces are installed in a linear movement fixture wherein they are precisely aligned with each other and their opposing edges to be joined together brought together.

4. A golf club head fabricated by the method of

forging a face plate piece;

forging a top crown and a sole piece with the top crown and sole being joined together by a bridging hinge;

bringing opposing edges of said top crown and sole piece together in abutment with each other by means of said hinge;

spot welding said top crown and said sole together along said edges to form a shell having an open end; and

seam welding said face plate piece to the open ended shell formed by said top crown and sole piece along the edges of said open end.

5. A golf club head fabricated by the method of claim 4 and further including installing said top crown and sole piece in a nest die prior to spot welding and spot welding said top crown and sole in said nest die.

6. A method for forming a golf club head comprising the steps of:

forging a face plate piece;

forging a top crown and sole piece with the top crown and sole being joined together by a bridging hinge;

bringing opposing edges of said top crown and sole piece together in abutment with each other by means of said hinge;

installing said top crown and sole piece in a nest die;

spot welding said top crown and said sole piece together in said nest die along said edges to form a shell having an open end; and

seam welding said face plate piece to the open ended shell formed by said top crown and sole piece along the edges of open end.

7. A golf club head fabricated by the method of

forging a face plate piece;

forging a top crown and a sole piece with the top crown and sole being joined together by a bridging hinge;

bringing opposing edges of said top crown and sole piece together in abutment with each other by means of said hinge;

installing said top crown and sole piece in a nest die;

spot welding said top crown and said sole together in said nest die along said edges to form a shell having an open end; and

seam welding said face plate piece to the open ended shell formed by said top crown and sole piece along the edges of said open end.