US2025001263A1PendingUtilityA1

Golf ball

52
Assignee: SUMITOMO RUBBER INDPriority: Jun 30, 2023Filed: Jun 24, 2024Published: Jan 2, 2025
Est. expiryJun 30, 2043(~16.9 yrs left)· nominal 20-yr term from priority
Inventors:Daijiro KojimaTakahiro Sajima
A63B 37/0043A63B 37/0017A63B 37/0074A63B 37/0075A63B 37/0033A63B 37/0018A63B 37/0063A63B 37/0031A63B 37/00621A63B 37/00622
52
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Claims

Abstract

An object of the present disclosure is to provide a golf ball having stable directionality on a driver shot while maintaining or improving a flight distance on a driver shot for a golfer with a slow head speed. The present disclosure provides a golf ball comprising a spherical core, and an outermost cover positioned outside the spherical core and having a plurality of dimples formed thereon, wherein a hardness difference S(=Hs−Ho) between a surface hardness Hs of the spherical core and a center hardness Ho (Shore C hardness) of the spherical core, a material hardness C (Shore D hardness) of the outermost cover, and a total volume V (mm3) of the plurality of dimples below a surface of a virtual sphere satisfy V×(S+C)/1000≥50.

Claims

exact text as granted — not AI-modified
1 . A golf ball comprising a spherical core, and an outermost cover positioned outside the spherical core and having a plurality of dimples formed thereon, wherein
 a hardness difference S(=Hs−Ho) between a surface hardness Hs of the spherical core and a center hardness Ho (Shore C hardness) of the spherical core,   a material hardness C (Shore D hardness) of the outermost cover, and   a total volume V (mm 3 ) of the plurality of dimples below a surface of a virtual sphere satisfy V×(S+C)/1000≥50.   
     
     
         2 . The golf ball according to  claim 1 , wherein Vi−1.50×Vo≥0 is satisfied where Vo is a total upper volume of the dimples, Vi is a total lower volume of the dimples, and V=Vo+Vi. 
     
     
         3 . The golf ball according to  claim 1 , wherein S×C≥1000 is satisfied. 
     
     
         4 . The golf ball according to  claim 1 , wherein the cover contains an ionomer resin. 
     
     
         5 . The golf ball according to  claim 1 , wherein S, C, and V satisfy 85≥V×(S+C)/1000≥50. 
     
     
         6 . The golf ball according to  claim 1 , wherein the hardness difference S of the spherical core ranges from 5 to 45 in Shore C hardness. 
     
     
         7 . The golf ball according to  claim 1 , wherein the surface hardness Hs of the spherical core ranges from 60 to 95 in Shore C hardness. 
     
     
         8 . The golf ball according to  claim 1 , wherein the center hardness Ho of the spherical core ranges from 30 to 70 in Shore C hardness. 
     
     
         9 . The golf ball according to  claim 1 , wherein the material hardness C of the outermost cover ranges from 20 to 65 in Shore D hardness. 
     
     
         10 . The golf ball according to  claim 1 , wherein the total volume V of the dimples ranges from 500 mm 3  to 900 mm 3 . 
     
     
         11 . The golf ball according to  claim 1 , wherein the outermost cover has a thickness ranging from 0.3 mm to 4.0 mm. 
     
     
         12 . The golf ball according to  claim 2 , wherein 260≥Vi−1.50×Vo≥0 is satisfied. 
     
     
         13 . The golf ball according to  claim 3 , wherein 2500≥S×C≥1000 is satisfied.

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