Patent ID: 6364585
Filing Date: 2002-04-02
Classification: F16B,Y10S

Abstract:
A screw comprising:a screw shaft having a male screw cut on one end, and a knob connected to a second end; said screw shaft and said knob forming a torque controller; wherein said torque controller includes claws on the outer surface of said second end of said screw shaft, each of said claws having a first surface and a second surface, and elastically deformable projections on an inner surface of said knob, said projections contacting said first surface of said claws when said screw is rotated in a direction for screwing and said second surface when screw is rotated in a direction for unscrewing; and said first surface of said claws are inclined at a first angle that cause said projections to elastically deform to slide over said first surface when said rotating torque between said screw shaft and said knob reaches a first predetermined level; whereby said torque controller rotates said screw shaft and said knob together until a rotating torque between said screw shaft and said knob reaches said first predetermined level, and slips said knob on said screw shaft in the direction of rotation if said rotating torque exceeds said predetermined level, while said knob is rotated along a direction for screwing said screw.