| 摘要 |
<p>Disclosed is a fastening tool equipped with a rotatively hitting mechanism comprising a cylinder disposed crossing a rotary axle of an anvil shaft at a right angle, a piston mounted slidably on and engaged with the cylinder, an oil passage communicating the inside of the cylinder with the outside of the anvil shaft, a rolling member disposed rolling along an inner wall surface of a rotating liner while being pressed with an elastic member, and a projection portion formed swelling inwardly on the inner wall surface of the rotating liner so as to hit the rolling member. The rotatively hitting mechanisms are disposed in plural numbers and at plural stages in a manner concentrically to each other, and the plural rotatively hitting mechanisms are disposed in a position relationship rotationally symmetrical to each other. An exhaust opening is disposed at a location nearby a body portion of the rotatively hitting mechanism.</p><p>The fastening tool as disclosed herein can support the portion to be hit at the time of an impact caused by pressing or hitting, thereby capable of generating a rotating force for sure and effectively transmitting a torque generated therefrom to the anvil. The fastening tool is also superior in lubricating performance and durability for a long term and it is further highly economical.
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