Counterweight assembly

Abstract

A counterweight assembly includes a tubular grip shaft attached to a golf club, a bearing member mounted in the tubular grip shaft and having a first fastening device, a locating member having a second fastening device fastened to the first fastening device of the bearing member, and a counterweight having an outer thread threaded into an inner thread in the locating member. Through the relative arrangement of the bearing member, locating member and counterweight of the counterweight assembly, every user can replace the counterweight to adjust the overall weight of the golf club for best fit for swinging. Thus, consumers need not to purchase various golf clubs of different counterweight ratios but simply to select a set of different weights of counterweights for the counterweight assembly, saving the cost.

What is claimed is: 
     
         1 . A counterweight assembly, comprising:
 a tubular grip shaft ( 10 ) attached to a golf club, said tubular grip shaft ( 10 ) comprising an accommodation chamber ( 11 ), and a stop flange ( 13 ) stopped at one end of said golf club;   a bearing member ( 20 ) mounted in said accommodation chamber ( 11 ) of said tubular grip shaft ( 10 ), said bearing member ( 20 ) comprising a first fastening device ( 212 ) located therein;   a locating member ( 30 ) comprising a second fastening device ( 312 ) located at the periphery thereof and fastened to said first fastening device ( 212 ) of said bearing member ( 20 ), and an inner thread ( 314 ) located in an inner perimeter thereof; and   a counterweight ( 40 ) comprising an outer thread ( 412 ) threaded into said inner thread ( 314 ) of said locating member ( 30 ).   
     
     
         2 . The counterweight assembly as claimed in  claim 1 , wherein said tubular grip shaft ( 10 ) further comprises an end wall ( 12 ); said accommodation chamber ( 11 ) is located in said end wall ( 12 ) and longitudinally extended toward an inner side of said tubular grip shaft ( 10 ). 
     
     
         3 . The counterweight assembly as claimed in  claim 1 , wherein said bearing member ( 20 ) comprises a head ( 22 ) and a base ( 24 ) located at a bottom side of said head, and a hole ( 21 ) cut through said head ( 22 ) and said base ( 24 ); said first fastening device ( 212 ) is located in an inner wall of said hole ( 21 ). 
     
     
         4 . The counterweight assembly as claimed in  claims 1 , wherein said locating member ( 30 ) comprises a bottom ( 32 ) and a hollow shank ( 31 ) extended from the bottom ( 32 ); said second fastening device ( 312 ) is located at the periphery of said hollow shank ( 31 ) and fastened to said first fastening device ( 212 ) of said bearing member ( 20 ); the inner thread ( 314 ) of said locating member ( 30 ) is located in an inner perimeter of said hollow shank ( 31 ) and threaded onto the outer thread ( 412 ) of said counterweight ( 40 ). 
     
     
         5 . The counterweight assembly as claimed in  claim 4 , wherein said locating member ( 30 ) further comprises a tool hole ( 33 ) cut through said bottom ( 32 ) in communication with the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         6 . The counterweight assembly as claimed in  claim 4 , wherein said counterweight ( 40 ) comprises a protrusion ( 41 ); the outer thread ( 412 ) of said counterweight ( 40 ) is located at the periphery of said protrusion ( 41 ) and threaded into the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         7 . The counterweight assembly as claimed in  claim 4 , wherein said first fastening device ( 212 ) of said bearing member ( 20 ) is an inner thread; said second fastening device ( 312 ) of said locating member ( 30 ) is an outer thread threaded into the inner thread of said first fastening device ( 212 ) of said bearing member ( 20 ). 
     
     
         8 . The counterweight assembly as claimed in  claim 1 , wherein said first fastening device ( 212 ) of said bearing member ( 20 ) is an inner thread; said second fastening device ( 312 ) of said locating member ( 30 ) is an outer thread threaded into the inner thread of said first fastening device ( 212 ) of said bearing member ( 20 ). 
     
     
         9 . The counterweight assembly as claimed in  claim 1 , wherein the outer diameter of said counterweight ( 40 ) is smaller than the inner diameter of said tubular grip shaft ( 10 ), and smaller or equal to the inner diameter of said inner tube (P) of said golf club. 
     
     
         10 . The counterweight assembly as claimed in  claims 2 , wherein said locating member ( 30 ) comprises a bottom ( 32 ) and a hollow shank ( 31 ) extended from the bottom ( 32 ); said second fastening device ( 312 ) is located at the periphery of said hollow shank ( 31 ) and fastened to said first fastening device ( 212 ) of said bearing member ( 20 ); the inner thread ( 314 ) of said locating member ( 30 ) is located in an inner perimeter of said hollow shank ( 31 ) and threaded onto the outer thread ( 412 ) of said counterweight ( 40 ). 
     
     
         11 . The counterweight assembly as claimed in  claim 10 , wherein said locating member ( 30 ) further comprises a tool hole ( 33 ) cut through said bottom ( 32 ) in communication with the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         12 . The counterweight assembly as claimed in  claim 10 , wherein said counterweight ( 40 ) comprises a protrusion ( 41 ); the outer thread ( 412 ) of said counterweight ( 40 ) is located at the periphery of said protrusion ( 41 ) and threaded into the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         13 . The counterweight assembly as claimed in  claim 10 , wherein said first fastening device ( 212 ) of said bearing member ( 20 ) is an inner thread; said second fastening device ( 312 ) of said locating member ( 30 ) is an outer thread threaded into the inner thread of said first fastening device ( 212 ) of said bearing member ( 20 ). 
     
     
         14 . The counterweight assembly as claimed in  claims 3 , wherein said locating member ( 30 ) comprises a bottom ( 32 ) and a hollow shank ( 31 ) extended from the bottom ( 32 ); said second fastening device ( 312 ) is located at the periphery of said hollow shank ( 31 ) and fastened to said first fastening device ( 212 ) of said bearing member ( 20 ); the inner thread ( 314 ) of said locating member ( 30 ) is located in an inner perimeter of said hollow shank ( 31 ) and threaded onto the outer thread ( 412 ) of said counterweight ( 40 ). 
     
     
         15 . The counterweight assembly as claimed in  claim 14 , wherein said locating member ( 30 ) further comprises a tool hole ( 33 ) cut through said bottom ( 32 ) in communication with the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         16 . The counterweight assembly as claimed in  claim 14 , wherein said counterweight ( 40 ) comprises a protrusion ( 41 ); the outer thread ( 412 ) of said counterweight ( 40 ) is located at the periphery of said protrusion ( 41 ) and threaded into the inner thread ( 314 ) of said locating member ( 30 ). 
     
     
         17 . The counterweight assembly as claimed in  claim 14 , wherein said first fastening device ( 212 ) of said bearing member ( 20 ) is an inner thread; said second fastening device ( 312 ) of said locating member ( 30 ) is an outer thread threaded into the inner thread of said first fastening device ( 212 ) of said bearing member ( 20 ).