Golf Club Head that Reduces a Contact Resistance with the Ground

Abstract

A golf club head includes a head body having a grounding face. The grounding face has a front portion and a rear portion. The rear portion of the grounding face is formed with a recessed portion. The recessed portion is provided with at least one protruding boss. Thus, the contact area between the grounding face of the head body and the ground is reduced largely by provision of the recessed portion to reduce the friction and resistance of the grounding face of the head body and to increase the striking force of the head body so as to increase the travel distance of the golf ball and to increase the striking effect of the head body.

1 . A golf club head, comprising a head body having a bottom provided with a grounding face; wherein
 the grounding face of the head body has a front portion and a rear portion located beside the front portion;   the rear portion of the grounding face of the head body is formed with a recessed portion;   the recessed portion of the grounding face of the head body is provided with at least one protruding boss.   
   
   
       2 . The golf club head in accordance with  claim 1 , wherein the recessed portion and the front portion of the grounding face of the head body have a height differential at least greater than 1 mm (millimeter). 
   
   
       3 . The golf club head in accordance with  claim 1 , wherein the recessed portion of the grounding face of the head body is provided with a plurality of protruding bosses which are spaced from each other. 
   
   
       4 . The golf club head in accordance with  claim 1 , wherein the grounding face of the head body has a mediate portion formed with a stepped shoulder located between the front portion and the recessed portion. 
   
   
       5 . The golf club head in accordance with  claim 1 , wherein the recessed portion of the grounding face of the head body is located at a height greater than that of the front portion of the grounding face of the head body. 
   
   
       6 . The golf club head in accordance with  claim 3 , wherein the protruding bosses are fixed on the recessed portion of the grounding face of the head body. 
   
   
       7 . The golf club head in accordance with  claim 3 , wherein the protruding bosses are arrange in a line. 
   
   
       8 . The golf club head in accordance with  claim 3 , wherein the protruding bosses are spaced from each other equally. 
   
   
       9 . The golf club head in accordance with  claim 3 , wherein each of the protruding bosses has a substantially semi-spherical cross-sectional profile. 
   
   
       10 . The golf club head in accordance with  claim 3 , wherein each of the protruding bosses has a specific gravity different from that of the head body to change a center of gravity of the head body. 
   
   
       11 . The golf club head in accordance with  claim 3 , wherein each of the protruding bosses can be processed by a surface treatment. 
   
   
       12 . The golf club head in accordance with  claim 3 , wherein each of the protruding bosses has a bottom located at a height equal to that of a bottom of the front portion of the grounding face of the head body. 
   
   
       13 . The golf club head in accordance with  claim 3 , wherein the protruding bosses occupy an area that is smaller than 30% (thirty percent) of that of the front portion of the grounding face of the head body. 
   
   
       14 . The golf club head in accordance with  claim 3 , wherein
 when the striking face of the head body is driven to hit a golf ball, the grounding face of the head body contacts a ground;   only the front portion and the protruding bosses of the grounding face of the head body contact the ground.   
   
   
       15 . The golf club head in accordance with  claim 3 , wherein the protruding bosses are arrange in arc-shaped manner. 
   
   
       16 . The golf club head in accordance with  claim 3 , wherein each of the protruding bosses has a substantially oblong cross-sectional profile.