Golf club with improved impact property

Claim 1

A golf club comprising a head having a neck portion, a shaft having a distal end portion attached to said neck portion of said head and neck neighboring portion adjacent to said distal end portion for which said shaft is dynamically bent due to an impact of said head with a golf ball during a swing of said golf club so that said neck neighboring portion is initially bent backward relative to the remaining portion of said shaft, and means located in said distal end portion and said neck neighboring portion for controlling a response to the impact, wherein said neck neighboring portion is moved forward after the initial bending thereof to cause said head to advance relative to said shaft in the direction of a flight of the golf ball while said head is in contact with the golf ball, wherein said means for controlling the response to the impact comprises core means highly responsive to an impact and extending consecutively in said distal end portion and said neck neighboring portion of said shaft, and wherein said core means comprises an elongated core member having a central through hole, a rod extending through said central through hole of said core member, and abutting members adjustably attached to said rod on either side of said core member so that said core member can be adjustably tightened.