Golf ball having non-concentric parting line
View Patent ↗The present invention is directed to a golf ball comprising of non-concentric arcs defining a non-planar parting line on its spherical surface resulting in having a large size disparity between dimples in one hemisphere and adjacent dimples from the opposing hemisphere. The parting line is produced by a pair of adjacent dimples, wherein D indicates dimples and N indicates dimples from the Northern hemisphere and those from the Southern hemisphere are indicated by S. A large disparity may be created, if the following condition is satisfied: D ( N ) D ( S ) > 1.25 or D ( N ) D ( S ) < 0.80 .
1. A golf ball having a non-planar parting line about dimples on its spherical surface, the parting line comprising:
non-concentric arcs having straight connecting line segments between the arcs, wherein each arc maintains a tangency with its connecting lines and a relief distance greater than 0.002 inches when measured from a dimple edge to one of the non-concentric arcs; and
a radius of each non-concentric arc relates to a corresponding dimple perimeter diameter according to the equations:
r
A
<
D
2
and
r
A
>
(
0.10
)
D
2
wherein r A is the radius of a non-concentric arc, and
D is the dimple perimeter diameter.
2. The golf ball according to claim 1 , wherein the golf ball comprises:
A plane comprising a dimple center and the vertical axis through the center of the ball; and
another plane comprising the center of a corresponding non-concentric arc and said vertical axis through the center of the ball,
wherein these planes create an arc shift angle defined to the dimple perimeter diameter by the equation
θ
≤
π
D
6
θ is the arc shift angle.
3. The golf ball according to claim 1 , wherein adjacent dimples on opposing hemisphere sides of the parting line have a large size disparity which is defined by the equation:
D
(
N
)
D
(
S
)
>
1.40
or
D
(
N
)
D
(
S
)
<
0.70
D(N) being the diameter of a dimple in the Northern hemisphere of the ball; and
D(S) being the diameter of a dimple in the Southern hemisphere.
4. The golf ball according to claim 3 , wherein adjacent dimples on opposing hemisphere sides of the parting line have a large size disparity which is defined by the equation:
D
(
N
)
D
(
S
)
>
1.25
or
D
(
N
)
D
(
S
)
<
0.80
.
5. The golf ball according to claim 1 , wherein adjacent dimples on opposing hemisphere sides of the parting line are weighted more towards one hemisphere over the other, based on the equation:
C RP >1.5 or C RP <0.66
C RP is the dimple radius preference coefficient.
6. The golf ball according to claim 5 , wherein adjacent dimples on opposing hemisphere sides of the parting line are weighted more towards one hemisphere over the other, based on the equation:
C RP >2.0 or C RP <0.50.
7. The golf ball according to claim 1 , wherein the dimple pattern of the ball is an icosahedron-based dimple pattern.
8. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a dodecahedron-based dimple pattern.
9. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a pentagonal dipyramid-based dimple pattern.
10. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a triangular dipyramid-based dimple pattern.
11. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a tetrahedron-based dimple pattern.
12. The golf ball according to claim 1 , wherein the dimple pattern of the ball is an icosidodecahedron-based dimple pattern.
13. The golf ball according to claim 1 , wherein the dimple pattern of the ball is octahedral-based dimple pattern.
14. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a cube-octahedral dimple pattern.
15. The golf ball according to claim 1 , wherein the dimple pattern of the ball is a hexagonal dipyramid dimple pattern.
16. The golf ball according to claim 1 , wherein the spherical surface is a cover formed from a urethane or a urea material.