Golf ball
AssigneeSRI Sports Limited
InventorTakahiro Sajima
Life of this patent
Estimating the term…
Abstract
Two-tiered dimples 8 of a golf ball have a first recessed part X and a second recessed part Y. The first recessed part X substantially forms a part of a spherical shape. The first recessed part X includes a first opening 14, a side wall curved face 16 and a flat face 18. The second recessed part Y is substantially a regular quadrangular pyramid. This second recessed part Y includes a second opening 20, a slope 22 and a bottom face 24. The second opening 20 is a regular tetragon. The first recessed part X improves aerodynamic symmetry of the golf ball. The second recessed part Y improves a dimple effect. Proportion of the number of the two-tiered dimples 8 to total number of the dimples is equal to or greater than 70%.
Claims4
A golf ball having numerous dimples on the surface thereof,
- said dimples including two-tiered dimples,
- proportion of the number of the two-tiered dimples to total number of the dimples being equal to or greater than 70%,
- said two-tiered dimple having a first recessed part and a second recessed part,
- said first recessed part comprising a circular first opening positioned on a phantom spherical surface, a side wall curved face positioned on the inside of said first opening, and a flat face positioned on the inside of said side wall curved face,
- said second recessed part comprising a polygonal second opening positioned on the flat face, a slope positioned on the inside of said second opening, and a bottom face positioned on the inside of said slope.
Dependencies are inferred from the claim text.