Golf ball dimples having circumscribed prismatoids
View Patent ↗The present invention relates to golf balls, specifically, to a golf ball with multifaceted depressions comprising two discrete geometries surrounded by a first perimeter. A second perimeter is circumscribed within the first and surrounds prismatoid depressions or protrusions. Primarily the first and second perimeters are circular and the depressions or protrusions are based on a polyhedral prismatoid having a minimum of three and a maximum of twelve edges, wherein the ratio of the first and second diameters is between 0.25 to 0.90.
1. A golf ball having recessed dimples on the surface thereof, wherein at least one dimple comprises:
two discrete geometries that are surrounded by a first circular perimeter; and
one of the discrete geometries comprises a prismatoid depression or protrusion surrounded by a smaller, second circular perimeter that is circumscribed within the first, and is in contact with all prismatoid vertices,
wherein the prismatoid depression or protrusion is based on a polyhedral prismatoid selected from the group consisting of pyramids, cupolas and frusta.
2. The golf ball according to claim 1 , wherein the base of the prismatoid maintains a minimum of three and a maximum of twelve edges.
3. The golf ball according to claim 1 , wherein a ratio of diameters of the first and second circular perimeters is defined by:
r
c
=
D
S
D
D
wherein:
r c is the circle ratio
D D is the diameter of the first circular perimeter
D S is the diameter of the second circular perimeter.
4. The golf ball according to claim 3 , wherein the range of values for r c is about 0.25 to about 0.90.
5. The golf ball according to claim 4 , wherein each dimple maintains an effective theoretical edge angle controlled by the dimple volume.
6. The golf ball according to claim 5 , wherein the effective theoretical edge angle is equal to or greater than 9° and equal to or less than 18°.
7. The golf ball according to claim 6 , wherein the effective theoretical edge angle is equal to or greater than 12° and equal to or less than 16°.