Golf club head having multi-layered striking face

Abstract

A golf club head having a multi-layered striking face is disclosed herein. More specifically, the golf club head in accordance with the present invention has an external frontal face layer, an internal rear face layer, and an intermediary sandwiched face layer juxtaposed between the external frontal face layer and the internal rear face layer. The intermediary sandwiched face layer may generally be made out of a polymeric material. The internal rear face layer may generally have a substantially non-uniform thickness formed via a substantially planar rear surface and a substantially non-planar frontal surface.

1 . A golf club head comprising:
 a striking face portion located at a frontal portion of said golf club head;
 said striking face portion further comprises;
 an external frontal face layer located at an external frontal portion of said striking face portion; 
 an internal rear face layer located at an internal rear portion of said striking face portion; and 
 an intermediary sandwiched face layer, juxtaposed between said external frontal face layer and said internal rear face layer, 
 
   an aft rear portion attached to the rear of said striking face portion;   wherein said internal rear face layer has a non-uniform thickness created by a substantially planar rear surface and a substantially non-planar front surface   wherein said intermediary sandwiched face layer further comprises a thinned central region and a thickened perimeter region, and   wherein said thinned central region of said intermediary sandwiched face layer has a thickness of between about 0.4 mm to about 1.0 mm, and said thickened perimeter region has a thickness of about 1.7 mm.   
     
     
         2 . The golf club head of  claim 1 , wherein said intermediary sandwiched face layer completely separates said external front face layer from said internal rear face layer. 
     
     
         3 . The golf club head of  claim 1 , wherein said intermediary sandwich face layer is made out of a polymeric material. 
     
     
         4 . The golf club head of  claim 1 , wherein said intermediary sandwiched face layer is made out of a polymeric material having a Shore D hardness of between about 55 to about 75. 
     
     
         5 . The golf club head of  claim 4 , wherein said polymeric material of said intermediary sandwiched face layer has a Shore D hardness of between about 60 to about 70. 
     
     
         6 . The golf club head of  claim 5 , wherein said polymeric material of said intermediary sandwiched face layer has a Shore D hardness of about 65. 
     
     
         7 . The golf club head of  claim 1 , wherein said intermediary sandwiched face layer has a non-uniform thickness. 
     
     
         8 . The golf club head of  claim 1 , wherein said intermediary sandwiched face layer has a rear surface that is substantially non-planar. 
     
     
         9 . The golf club head of  claim 8 , wherein said intermediary sandwiched face layer has a frontal surface that is a substantially planar. 
     
     
         10 . The golf club head of  claim 8 , wherein said intermediary sandwiched face layer has a frontal surface that is substantially non-planar, forming a pocket. 
     
     
         11 . The golf club head of  claim 1 , wherein said external frontal face layer has a substantially uniform thickness. 
     
     
         12 - 14 . (canceled) 
     
     
         15 . The golf club head of  claim 1 , wherein said thinned central region of said intermediary sandwiched face layer has a thickness of between about 0.4 mm to about 0.6 mm, and said thickened perimeter region has a thickness of about 1.7 mm. 
     
     
         16 . A golf club head comprising:
 a striking face portion located at a frontal portion of said golf club head;
 said striking face portion further comprises; 
 an external frontal face layer located at an external frontal portion of said striking face portion; 
 an internal rear face layer located at an internal rear portion of said striking face portion; and 
 an intermediary sandwiched face layer, juxtaposed between said external frontal face layer and said internal rear face layer, 
   an aft rear portion attached to the rear of said striking face portion;   wherein said intermediary sandwiched face layer is made out of a polymeric material having a Shore D hardness of between about 55 to 75,   wherein said intermediary sandwiched face layer has a non-uniform thickness,   wherein said intermediary sandwiched face layer has a rear surface that is substantially non-planar and a frontal surface that is substantially planar,   wherein said intermediary sandwiched face layer further comprises a thinned central region and a thickened perimeter region, and   wherein said thinned central region of said intermediary sandwiched face layer has a thickness of between about 0.4 mm to about 1.0 mm, and said thickened perimeter region has a thickness of between about 1.5 mm to about 1.9 mm.   
     
     
         17 . The golf club head of  claim 16 , wherein said polymeric material of said intermediary sandwiched face layer has a Shore D hardness of between about 60 to about 70. 
     
     
         18 . The golf club head of  claim 17 , wherein said polymeric material of said intermediary sandwiched face layer has a Shore D hardness of about 65. 
     
     
         19 . The golf club head of  claim 17 , wherein said intermediary sandwiched face layer further comprises a thinned central region and a thickened perimeter region, and wherein said internal rear face layer has a non-uniform thickness created by a substantially planar rear surface and a substantially non-planar front surface. 
     
     
         20 . A golf club head comprising:
 a striking face portion located at a frontal portion of said golf club head;
 said striking face portion further comprises;
 an external frontal face layer located at an external frontal portion of said striking face portion; 
 an internal rear face layer located at an internal rear portion of said striking face portion; and 
 an intermediary sandwiched face layer, juxtaposed between said external frontal face layer and said internal rear face layer, 
 
   an aft rear portion attached to the rear of said striking face portion;   wherein said internal rear face layer has a non-uniform thickness created by a substantially planar rear surface and a substantially non-planar front surface,   wherein said internal rear face layer further comprises a thickened central region and a thinned perimeter region,   wherein said thickened central region of said internal rear face layer has a thickness of between about 2.0 mm to about 4.0 mm, and said thinned perimeter region has a thickness of between about 1.5 mm to about 2.5 mm,   wherein said intermediary sandwiched face layer is made out of a polymeric material having a Shore D hardness of between about 55 to 75, and   wherein said intermediary sandwiched face layer has a non-uniform thickness,   wherein said intermediary sandwiched face layer has a rear surface that is substantially non-planar and a frontal surface that is substantially planar,   wherein said intermediary sandwiched face layer further comprises a thinned central region and a thickened perimeter region,
 wherein said thinned central region of said intermediary sandwiched face layer has a thickness of between about 0.4 mm to about 1.0 mm, and said thickened perimeter region has a thickness of between about 1.3 mm to about 2.1 mm, and 
   wherein said external frontal face layer has a uniform thickness.