Patent ID: 7013769

Claim:
A torque adjustable screw driver comprising: a handle; a first disk rotatably connected to an end of the handle and having a first inclined end surface defined in a top thereof, a plurality of protrusions extending from the first inclined end surface; a second disk having a second inclined end surface defined in a bottom thereof, a plurality of grooves defined in the second inclined end surface, the second inclined end surface contacting the first inclined end surface; a sleeve mounted to the first and second disks and a board assembly rotatably engaged with an inner periphery of the sleeve, a spring biased between the second disk and the board assembly, and a shank having a first section with a polygonal cross section, the first section rotatably extending through a first hole in a close top of the sleeve and securely extending through a polygonal hole defined through the board assembly, a distal end of the first section extending through the spring, a second hole in the second disk, a third hole in the first disk and being fixed to the handle.