# US 5,707,302 A · Iron-style golf club

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- Number: US 5,707,302 A
- Document ID: US5707302A
- Status: Granted
- Kind: A
- Application number: 08/610,112
- Filed: 1996-02-29
- Granted: 1998-01-13
- Earliest claimed: 1996-02-29
- Inventors: Joseph A. Leon; Richard F. Zopf
- Web page: https://patentgrep.com/patent/US5707302A

## CPC

- A63B 53/04: Heads
- A63B 53/047: {iron-type}
- A63B 60/54: with means for damping vibrations
- A63B 53/0416: {Heads having an impact surface provided by a face insert}
- A63B 53/0458: {with non-uniform thickness of the impact face plate}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

An improved, iron-style golf club, which comprises a substantially perimeter weighted clubhead, including an exceptionally hard coating, which is metallurgically bonded to the front face of the clubhead. The rear face of the club comprises concentric recesses substantially co-located at the center of gravity of the clubhead. The recesses are sequentially filled with a variable amount of elastomer material, which is chemically bonded within the recesses. The elastomer acts as both a shock absorber to minimize the shock experienced when the superhard clubface impacts a golf ball and simultaneously acts as a swingweighting medium to variably adjust the swingweight of the club.

## Claims

### Claim 1

An improved golf club comprising a golf club head including an exceptionally hard clubface combined with a combination variable swingweight adjustment-shock absorption system to allow for swingweight adjustment and to absorb any excess shock experienced when said exceptionally hard face impacts a golf ball, said variable swingweight system substantially co-located at the location of the center of gravity of said club such that the swingweight of said club can be adjusted without substantially affecting the center of cavity of said club, wherein said combination swingweight adjustment-shock absorption system comprises an ultraviolet (UV) light curable elastomer system, which can be added to a rear face of said clubhead an any number of a plurality of concentric recesses in said rear face of said clubhead, said recesses being substantially co-located with the location of said center of gravity of said clubhead.

### Claim 2 (depends on 1)

The improved golf club of claim 1, wherein said UV light curable elastomer system comprises a UV light curable primer and a UV light curable top coat.

### Claim 3

A method of variably adjusting the swingweight of a golf club comprising applying an ultraviolet (UV) light curable primer to a rear surface of a golf club head, curing said primer by exposing said rear surface of said golf club head to a UV light source for a short period of time, applying a variable quantity of a UV light curable top coat to said rear surface of said golf club head on top of said primer, said quantity of top coat being selected to coincide with the amount of weight desired to be added to said golf club head, and curing said top coat by exposing said top coat to a UV light source.

### Claim 4 (depends on 3)

The method of variably adjusting the swingweight of a golf club claimed in claim 3, wherein said rear surface comprises a plurality of concentric recesses substantially co-located with the center of gravity of said golf club head.

### Claim 5

An improved golf club comprising a golf club head including an exceptionally hard clubface in combination with a variable swingweight adjustment-shock absorption system to allow for swingweight adjustment and to absorb any excess shock experienced when said exceptionally hard face impacts a golf ball, wherein said variable swingweight adjustment--shock absorbtion system comprises a plurality of concentric recesses located in a rear surface of said club head, said recesses being substantially co-located at the location of the center of gravity of said club head and incrementally filled with a polymer material such that the swingweight of said club can be adjusted without substantially affecting the location of the center of gravity of said golf club.

### Claim 6 (depends on 5)

The improved golf club as claimed in claim 5, wherein said variable swingweight adjustment--shock absorption system further comprises an elastomer with which said recesses are filled.