Thread-wound golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsJunji Umezawa, Shinichi Kakiuchi
Life of this patent
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Abstract
A thread-wound golf ball has a wound core consisting of a center with a diameter of 29-37 mm and a rubber thread layer with a thickness of 1.0-2.5 mm. A cover enclosing the wound core is of two-layer construction comprising a relatively soft inner cover layer and a relatively hard outer cover layer having a Shore D hardness of 55-65. The inner and outer cover layers combined have a thickness of 2.0-5.0 mm. This construction gives the golf ball an excellent scuff resistance when hit with an iron club, as well as an improved spin, feel, and flight performance upon a full shot with a driver.
Claims12
A thread-wound golf ball comprising;
- a thread-wound core having a center and a layer of rubber thread wound about the center, and a cover enclosing the thread-wound core, said cover having a two-layer construction comprising an inner cover layer and an outer cover layer, said outer cover layer having a greater hardness than that of the inner cover layer, wherein
- the outer cover layer has a Shore D hardness in the range of 55 to 65,
- the inner cover layer and the outer cover layer have a combined thickness in the range of 2.0 to 5.0 mm,
- the rubber thread layer has a thickness in the range of 1.0 to 2.5 mm,
- the center has a diameter in the range of 29 to 37 mm, and
- the rubber thread layer is impregnated with an emulsion containing ionomer or urethane resin solids, followed by drying, and said inner cover layer injection molded over the rubber thread layer.
Dependencies are inferred from the claim text.