| 摘要 |
A driver type of golf club is provided which includes a hollow metal head having integrally formed thereon a front striking face and a rear wall with interior flat portions, and a removable sole plate. A rod having a back plate integrally formed on the rear thereof has a cylindrical weight slidably mounted thereon. The rod is fixed in position within said hollow metal head with its back plate anchored against the interior flat portions on the rear wall thereof and with its front end held in an opening provided in a front plate anchored against the back of the striking face. At the instant of impact of the striking face of the head with a golf ball, the cylindrical weight is propelled to freely slide along the fixed rod to hit the front plate on the back of the striking face, and therefore the ball, with a delayed impulse which creates an additional transfer of momentum to the ball thereby increasing the distance that the ball travels.
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