| 摘要 |
<p>PROBLEM TO BE SOLVED: To substantially prevent the occurrence of a geometric distortion in directivity and to expect an increase in a carry by sealing no-chlorine-base cutting fluid into a hollow part of a golf club which is made hollow over the entire part in a head movably over the entire part of the rear surface of a clubface. SOLUTION: The no-chlorine-base cutting fluid (liquid a) is sealed movably over the entire part on the rear surface of the club face into the hollow part of the golf club which is made hollow over the entire part in the head. The no-chlorine-base cutting fluid prevents the generation of rust by chlorine and does not damage a blank. The liquid (a) gathered at the rear part of the head at the time of the top of a swing collides explosively and intensively at a time in the form of the mass of energy against the rear surface of the face at the time of an impact. To this energy, the effects of a head speed, centrifugal force and heavy acceleration are added. Such effect is resulted from the application of the principle that when a ball on a thin iron sheet is struck by a hammer from below, the ball jumps up and down, i.e., the force generated by the liquid (a) in the head which hinders inertia moment when the face strikes the ball accelerates the head speed and increases the carry.</p> |
