Practice golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHisashi Yamagishi, Jun Shindo, Hiroto Sasaki
Life of this patent
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Abstract
A practice golf ball having a multiplicity of dimples formed in its surface has a weight of 46.5-49.0 grams and undergoes a distortion of 2.5-4.0 mm under a constant load of 100 kg. A percent dimple volume Vr is in the range of 0.7%.ltoreq.Vr.ltoreq.1.1% wherein the percent dimple volume Vr is the sum of the volumes of the entire dimples divided by the volume of a phantom sphere given on the assumption that the ball surface is free of dimples. The ball offers a good feel upon shots, follows a low trajectory without substantial shortage of a flight distance, and is thus suited for use in urban golf practice pits of limited space.
Claims4
A practice golf ball having a multiplicity of dimples formed in its surface, wherein said ball has a weight of 46.5 to 49.0 grams and undergoes a distortion of 2.5 to 4.0 mm under a constant load of 100 kg, and a percent dimple volume Vr is in the range of 0.7%.ltoreq.Vr.ltoreq.1.1% wherein the percent dimple volume Vr is the sum of the volumes of the entire dimples divided by the volume of a phantom sphere given on the assumption that the ball surface is free of dimples.
Dependencies are inferred from the claim text.