Golf Club System with Golf Bag

Abstract

A golf club system has at least one golf club shaft assembly and a plurality of detachable golf club head assemblies. The golf club shaft assembly includes a shaft segment, a grip, and a coupler. The golf club head assembly includes a golf club head, a head shaft segment, and a head coupler pin to reversibly mate the golf club head assembly to a golf club shaft assembly to make a golf club. Any one of the golf club head assemblies can be attached to the golf club shaft assembly using a coupler. A second coupler allows the at least one golf club shaft assembly to be split into an upper shaft segment and a lower shaft segment to reduce the size of the golf club system. The golf club system can include a golf bag to hold the at least one shaft and plurality of detachable golf club head assemblies.

What is claimed is: 
     
         1 . A golf club system, comprising:
 a shaft with a grip and a coupler, the coupler having a coupler housing that has a housing attachment pin that is attached to the shaft to attach the coupler, the shaft having an interior surface that is scored to accept glue to firmly attach the housing attachment pin;   a plurality of golf club head assemblies, each golf club assembly having a golf club head attached to a second shaft, each second shaft having a second shaft length that is shorter than the shaft length of the first shaft, and a head coupler pin attached to each second shaft;   wherein the coupler is configured to accept each head coupler pin of each golf club assembly to tightly couple the first shaft to the second shaft.   
     
     
         2 . The golf club system of  claim 1 , further comprising a hosel. 
     
     
         3 . The golf club system of  claim 1 , wherein the coupler housing comprises an interior surface and a plurality of ball bearings that contact the interior surface of the coupler housing and wherein the coupler head pin comprises an exterior surface that contacts the plurality of ball bearings, and wherein the portion of the coupler housing interior surface that contacts a ball bearing and the portion of the exterior portion of the head coupler pin that contacts a ball bearing are hardened, and the remaining portions of the coupler housing and the head coupler pin are not hardened. 
     
     
         4 . The golf club system of  claim 1 , wherein the coupler head pin has a conical shape. 
     
     
         5 . The golf club system of  claim 1 , wherein the shaft assembly comprises a second coupler. 
     
     
         6 . The golf club system of  claim 5 , wherein the second coupler is threaded. 
     
     
         7 . The golf club system of  claim 6 , wherein the threading is directional. 
     
     
         8 . The golf club system of  claim 7 , wherein the second coupler includes a receptacle that can receive a second coupler pin. 
     
     
         9 . The golf club system of  claim 8 , wherein the second coupler pin has a conical shape. 
     
     
         10 . The golf club system of  claim 1 , further comprising a golf club bag to store the plurality of golf club head assemblies and the shaft assembly. 
     
     
         11 . The golf club system of  claim 10 , wherein the golf bag is a backpack. 
     
     
         12 . The golf club system of  claim 10 , wherein the golf bag includes a computer tablet. 
     
     
         13 . The golf club system of  claim 1 , wherein the coupler includes a pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly. 
     
     
         14 . The golf club system of  claim 5 , wherein the wherein the second coupler includes a pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly. 
     
     
         15 . The golf club system of  claim 1 , wherein each second shaft has a length that depends upon the golf club head to which it is attached. 
     
     
         16 . A golf club system comprising:
 a golf club shaft assembly comprising an upper shaft segment having a grip, a coupler body attached to the shaft and a threaded collar, and a lower shaft segment having a receptacle for receiving the coupler body, and a threaded portion to receive the threaded collar to forcibly mate the lower shaft segment to the upper shaft segment, the lower shaft segment also comprising a second coupler; and   a plurality of golf club head assemblies, each golf club head assembly comprising a golf club head attached to a head shaft segment, and a head coupler pin attached to the head shaft segment that fits into the second coupler to forcibly mate the golf club head assembly with the lower shaft segment.   
     
     
         17 . The golf club system of  claim 16 , wherein the first coupler includes an anti-rotation pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly. 
     
     
         18 . The golf club system of  claim 16 , wherein the second coupler includes an anti-rotation pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly. 
     
     
         19 . The golf club system of  claim 16 , wherein the coupler body is conical in shape. 
     
     
         20 . The golf club system of  claim 16 , wherein the head coupler pin is conical in shape. 
     
     
         21 . The golf club system of  claim 16 , wherein both the first and second couplers have portions that are hardened and portions that are not hardened. 
     
     
         22 . The golf club system of  claim 16 , wherein the head shaft segment has an interior that has a scoring to accept glue for firmly attaching the head coupler pin to the head shaft segment. 
     
     
         23 . The golf club system of  claim 16 , wherein the second coupler has a coupler attachment pin, and the lower shaft segment has an interior that has a scoring to accept glue for firmly attaching the second coupler to the lower shaft segment. 
     
     
         24 . The golf club system of  claim 16 , wherein each head shaft segment has a length dependent on the golf club head to which it is attached.