Thread-wound golf ball

Abstract

A thread-wound golf ball includes a solid center, a rubber thread layer wound around the surface of the solid center, and a cover enveloping the surface of the rubber thread layer, the cover having dimples formed thereon. An amount of deformation of the solid center under a load of 9.8 N-294 N is 1.0-1.5 mm. A difference between the diameter A1 of the solid center and the thickness A2 of the rubber thread layer represented by (A1−A2) is 34.5-36.5 mm. The cover has a Shore D hardness of 44-58. Dimple volume ratio Rv and the difference between the diameter of the solid center and the thickness of the rubber thread layer represented by (A1−A2) satisfy a relation: 24.5≦(A1−A2)×Rv≦29.0.

What is claimed is:  
     
         1 . A thread-wound golf ball comprising a solid center, a rubber thread layer wound around said solid center and a cover enveloping said rubber thread layer, said cover having dimples formed thereon, wherein 
 an amount of deformation of said solid center under a load of 9.8 N-294N is 1.0-1.5 mm,    a difference between the diameter A1 of said solid center and the thickness A2 of said rubber thread layer represented by (A1−A2) is 34.5-36.5 mm,    said cover has a Shore D hardness of 44-58, and    dimple volume ratio Rv and the difference between the diameter of said solid center and the thickness of said rubber thread layer represented by (A1−A2) satisfy a relation:    24.5≦( A 1 −A 2)× Rv≦ 29.0.    
     
     
         2 . The thread-wound golf ball according to  claim 1 , wherein 
 said solid center has a surface hardness greater than its center hardness that are measured by a JIS-C hardness tester, and a difference between the surface hardness and the center hardness is 15-35.    
     
     
         3 . The thread-wound golf ball according to  claim 1 , wherein 
 said solid center has a surface hardness of 70-90 measured by a JIS-C hardness tester.    
     
     
         4 . The thread-wound golf ball according to  claim 1 , wherein 
 dimple volume ratio Rv is 0.600-0.950%.