Safety golf ball for practice

Abstract

The present invention relates to a safety golf ball for practice and, more specifically, to a safety golf ball for practice, by which a similar effect to the practice using a real golf ball can be obtained and a safety accident can be prevented. To this end, the safety golf ball for practice includes a soft outer core on an existing inner core so as to have a fast elasticity recovery speed.

1 . A safety golf ball for practice comprising:
 an inner core;   a soft outer core having hardness lower than that of the inner core; and   a cover positioned outside,   wherein the hardness of the outer core is gradually reduced outward.   
     
     
         2 . The safety golf ball according to  claim 1 , wherein the outer core has three or more layers. 
     
     
         3 . The safety golf ball according to  claim 2 , wherein the outer core is made of a material of a polyurethane sponge. 
     
     
         4 . The safety golf ball according to  claim 2 , wherein hardness of the outer core decreases outward linearly. 
     
     
         5 . The safety golf ball according to  claim 1 , wherein a rotation recognition pattern is formed on the cover. 
     
     
         6 . The safety golf ball according to  claim 5 , wherein the rotation recognition pattern includes a mark including two or more bending structures, a mark in which two points and a straight line are combined, a mark in which three points are combined, or a portion of the shape of a QR code. 
     
     
         7 . The safety golf ball according to  claim 3 , wherein hardness of the outer core decreases outward linearly.