# US 5,704,853 A · Thread-wound golf balls

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- Number: US 5,704,853 A
- Document ID: US5704853A
- Status: Granted
- Kind: A
- Application number: 08/643,353
- Filed: 1996-05-06
- Granted: 1998-01-06
- Earliest claimed: 1995-05-29
- Assignees: Bridgestone Sports Co., Ltd.
- Inventors: Takashi Maruko; Junji Hayashi; Shinichi Kakiuchi
- Web page: https://patentgrep.com/patent/US5704853A

## CPC

- A63B 37/0003: {Golf balls}
- A63B 37/0016: {Specified individual dimple volume}
- A63B 37/0018: {Specified number of dimples}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0054: {Substantially rigid, e.g. metal}
- A63B 37/0064: {Diameter}
- A63B 37/008: {Diameter}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

The present invention provides a thread-wound golf ball comprising a thread rubber ball prepared by winding thread rubber around a spherical solid center, and a cover enclosing the thread rubber ball therewith, which has a number of dimples of from 350 to 500 and a dimple volume rate of 0.76 to 0.9 percent, and wherein the solid center has an outer diameter of from 27 to 38 mm, a deformation under a load of 30 Kg of from 1.5 to 3.5 mm and a rebound, when dropped from a height of 120 cm, of at least 96 cm. The thread-wound golf balls of the present invention show good spin properties in addition to good restitution properties, resulting in improved travel distance.

## Claims

### Claim 1

A thread-wound golf ball comprising a thread rubber ball prepared by winding thread rubber around a spherical solid center, and a cover enclosing the thread rubber ball therewith, which has a number of dimples of from 350 to 500 and a dimple volume rate of 0.76 to 0.9 percent, and wherein the solid center has an outer diameter of from 27 to 38 mm, a deformation under a load of 30 Kg of from 1.5 to 3.5 mm and a rebound, when dropped from a height of 120 cm, of at least 96 cm.

### Claim 2 (depends on 1)

A thread-wound golf ball according to claim 1, wherein the solid center has an outer diameter of from 28 to 35 mm, a deformation under a load of 30 kg of from 1.7 to 2.5 mm, and a rebound of from 98 to 110 cm.

### Claim 3 (depends on 2)

A thread-wound golf ball according to claim 2, wherein the solid center has an outer diameter of from 30 to 33 mm, a deformation under a load of 30 kg of from 1.8 to 2.2 mm, and a rebound of from 100 to 110 cm.

### Claim 4 (depends on 1)

A thread-wound golf ball according to claim 1, wherein the number of dimples is in the range of from 370 to 480.

### Claim 5 (depends on 1)

A thread-wound golf ball according to claim 1, wherein the dimple volume rate is in the range of from 0.78 to 0.88 percent.

### Claim 6 (depends on 1)

A thread-wound golf ball according to claim 1, wherein the solid center is made of vulcanized rubber prepared from polybutadiene rubber or a blend of polybutadiene rubber and polyisoprene rubber.

### Claim 7 (depends on 1)

A thread-wound golf ball according to claim 1, wherein the cover is made of an ionomer resin or balata in the form of a single layer or a multiple layer.

### Claim 8 (depends on 7)

A thread-wound golf ball according to claim 7, wherein the cover is a single layer cover having a hardness on the Shore D scale of from 40 to 68, and a thickness of from 1.0 to 2.5 mm.

### Claim 9 (depends on 7)

A thread-wound golf ball according to claim 7, wherein the cover is a multi-layer cover comprising an outer cover formed of a resin having a hardness on the Shore D scale of from 40 to 55, and an inner cover formed of a resin having a hardness on the Shore D scale of from 55 to 68.

### Claim 10 (depends on 9)

A thread-wound golf ball according to claim 9, wherein the inner cover has a thickness of from 0.4 to 3.0 mm, and the total thickness of the inner cover and the outer cover is from 1.0 to 4.0 mm.