One-body precision cast metal wood

• US 5,219,408 A
• Filed: 03/02/1992
• Issued: 06/15/1993
• Est. Priority Date: 03/02/1992
• Status: Expired due to Fees

• Current Assignee: Donald J.C. Sun
• Original Assignee: Donald J.C. Sun
• Inventors: Sun, Donald J. C.
• Primary Examiner(s): Seidel, Richard K.
• Assistant Examiner(s): PUKNYS, ERIK
• Application Number:
  US07/844,757
• Time in Patent Office: 470 Days
• Field of Search: 164/369, 164/368, 164/366, 164/365, 164/345, 164/346, 164/132, 164/76.1, 273/171
• US Class Current: 164/76.1
• CPC Class Codes: B22C 9/10 Cores; Manufacture or installation of cores breaker cores B22C9/084
• CPC Class Codes: B22C 9/108 Installation of cores
• CPC Class Codes: B22C 9/12 Treating moulds or cores, e.g. drying, hardening
• CPC Class Codes: B22D 17/24 Accessories for locating and holding cores or inserts
• CPC Class Codes: B22D 25/02 by its peculiarity of shape; of works of art cylinders, pistons B22D15/02

Abstract

A golf club metal wood head comprising a shell having a ball striking front face, a top wall, a bottom wall, and rear wall, and toe and heel walls, the combination comprising multiple ports in the bottom wall, the ports opening to the bottom wall exterior, and multiple inserts of different weight received into the ports from the exterior and connected to the bottom wall, the inserts having weights selected for golf club balance and swing adjustment.

Claims

1. In the method of making a golf club head comprising a shell having a ball striking face, a top wall, a bottom wall, a rear wall, and toe and heel walls, the steps that includes

a) forming a head core consisting of particles of sand or the like in a binder,

b) and casting molten lightweight metal about said core to form the shell walls,

c) applying a surface barrier coating to the core prior to said casting step, said coating decomposing at temperature in excess of about 1,000°

C.,

d) and forming multiple ports in said bottom wall by positioning rods in the core to project thereinto and outwardly of the core, then solidifying the core, then carrying out said coating application step, then solidifying said coating by baking thereof, then carrying out said casting step so that molten metal flows about said rods, then removing said rods after solidification of said molten metal to open said ports,

e) then removing said core particles via said opened ports, and via other ports formed in said metal by said rod removal,

f) and then connecting metal inserts into said other ports to close the other ports and with insert weights selected for club balance,

g) said baking of said coating including baking at a first temperature for a first time period, and baking at a second and higher temperature for a second and longer time period.

2. The method of claim 1 including preliminarily forming said inserts to have weights selected for golf club balance and swing adjustment.

3. The method of claim 1 wherein said ports and other ports are formed at different positions in said bottom wall to accommodate reception of weights selected for golf club balance and swing adjustment.

4. The method of claim 1 including cleaning out at least part of the core, via said ports.

5. The method of claim 1 wherein said binder includes a mixture of phenolic resin and isobutyro-nitrile acid, said resin curing at high temperature.

6. The method of claim 1 wherein said shell consists of aluminum alloy.

7. The method of claim 1, wherein said binder includes a mixture of phenolic resin and isobutyro-nitrile acid, said resin decomposing at high temperature.