Patent ID: 6026713
Filing Date: 2000-02-22
Classification: B25B

Abstract:
A pneumatically operated screw driver comprising:an air motor in which a rotor is rotatable in response to the pressure of pressurized air;a cylindrical rotary member connected to said air motor for causing a rotation in synchronism with the rotation of said rotor;a rotary slider slidable in an axial direction along an inner cylindrical wall of said rotary member;a rotational force transmitting mechanism for transmitting the rotation of said rotary member to said rotary slider;a shaft having one end fixed to said rotary slider and the other end equipped with a piston and a driver bit holder for transmitting a rotational and axial motion of said rotary slider to a driver bit held in said driver bit holder; anda cylinder for allowing an axial slide movement of said piston responsive to the pressure of pressurized air applied on a pressure receiving surface of said piston.