US2025281801A1PendingUtilityA1
Multi-piece solid golf ball
Est. expiryMar 6, 2044(~17.6 yrs left)· nominal 20-yr term from priority
Inventors:Hideo Watanabe
A63B 37/0084A63B 37/0068A63B 37/0012A63B 37/0087A63B 37/0018A63B 37/0033A63B 37/0096A63B 37/0063A63B 37/0075A63B 37/0017A63B 37/0043A63B 37/00622A63B 37/009
60
PatentIndex Score
0
Cited by
0
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0
Claims
Abstract
A multi-piece solid golf ball includes a core, an intermediate layer, and a cover, in which a large number of dimples are formed on an outside surface of the cover, a relationship between a surface hardness of an intermediate layer-encased sphere and a surface hardness of the ball is specified, an initial velocity of the ball is set from 76.0 to 77.724 m/s, a relationship of a ratio to a lift coefficient/drag coefficient at a Reynolds number of 218,000 and a spin rate of 2,800 rpm, a lift coefficient/drag coefficient at a Reynolds number of 184,000 and a spin rate of 2,900 rpm, and a lift coefficient/drag coefficient at a Reynolds number of 158,000 and a spin rate of 3,100 rpm is specified, and a volume occupancy ratio of the dimples is set within a predetermined range.
Claims
exact text as granted — not AI-modified1 . A multi-piece solid golf ball comprising a core, an intermediate layer, and a cover, wherein a large number of dimples are formed on an outside surface of the cover, a relationship between a surface hardness of an intermediate layer-encased sphere and a surface hardness of the ball satisfies the following condition:
Surface hardness of ball>surface hardness of intermediate layer-encased sphere where hardness means Shore C hardness, an initial velocity of the ball is from 76.0 to 77.724 m/s, and where a ratio CL1/CD1 of a lift coefficient CL1 at a Reynolds number of 218,000 and a spin rate of 2,800 rpm to a drag coefficient CD1 is denoted by A1, a ratio CL2/CD2 of a lift coefficient CL2 at a Reynolds number of 184,000 and a spin rate of 2,900 rpm to a drag coefficient CD2 is denoted by A2, and a ratio CL3/CD3 of a lift coefficient CL3 at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient CD3 is denoted by A3, the following two conditions are satisfied:
0.59
≤
A
1
≤
0.655
,
and
(
A
2
+
A
3
)
/
2
≥
0.67
,
and
a volume occupancy ratio VR of the dimples is from 0.75 to 0.89%, and the following condition is satisfied:
1
0
0
≤
D
/
B
≤
1
4
0
where a total volume of the dimples is denoted by D (mm 3 ) and a deflection when the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is denoted by B (mm).
2 . The multi-piece solid golf ball of claim 1 , wherein the value of A1 is from 0.590 to 0.613, the value of A2 is from 0.635 to 0.668, and the value of A3 is from 0.695 to 0.734.
3 . The multi-piece solid golf ball of claim 1 , wherein the value of A1 is from 0.614 to 0.655, the value of A2 is from 0.669 to 0.750, and the value of A3 is from 0.735 to 0.815.
4 . The multi-piece solid golf ball of claim 1 , wherein the value of (A2+A3)/2 is from 0.670 to 0.783.
5 . The multi-piece solid golf ball of claim 1 , wherein the cover is formed of an ionomer resin as a chief material.
6 . The multi-piece solid golf ball of claim 1 , wherein the core has a hardness profile in which, letting the Shore C hardness at a core center be Cc, the Shore C hardness at a midpoint M between the core center and a core surface be Cm, the Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm inward from the midpoint M be Cm−2, Cm−4, and Cm−6 respectively, the Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm outward from the midpoint M be Cm+2, Cm+4, and Cm+6 respectively, and the Shore C hardness at the core surface be Cs, and defining surface areas A to F as follows:
½×2×( Cm− 4− Cm− 6) surface area A:
½×2×( Cm− 2− Cm− 4) surface area B:
½×2×( Cm−Cm− 2) surface area C:
½×2×( Cm+ 2− Cm ) surface area D:
½×2×( Cm+ 4− Cm+ 2) surface area E:
½×2×( Cm+ 6− Cm+ 4) surface area F:
the following condition is satisfied:
{(surface area D +surface area E )−(surface area A +surface area B )}≥4.0.
7 . The multi-piece solid golf ball of claim 6 , wherein the core has a hardness profile in which the following condition is satisfied:
(
Cs
-
Cc
)
≥
2
0
.
8 . The multi-piece solid golf ball of claim 6 , wherein the core has a hardness profile in which the following condition is satisfied:
(
Cs
-
Cc
)
/
(
Cm
-
Cc
)
≥
3
.
0
.
9 . The multi-piece solid golf ball of claim 6 , wherein in the core hardness profile, an upper limit of the formula {(surface area D+surface area E)−(surface area A+surface area B)} is 15.0.
10 . The multi-piece solid golf ball of claim 1 , wherein the core is formed of a rubber composition containing the following components (A) to (D):
(A) a base rubber, (B) an organic peroxide, (C) water or a monocarboxylic acid metal salt, and (D) sulfur.Join the waitlist — get patent alerts
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