Patent ID: 6131478
Filing Date: 2000-10-17
Classification: F16H,Y10T

Abstract:
An anti-backlash nut designed to undergo bidirectional translation along a rotatable screw having an external thread, the nut having an internal thread complementary to the thread on the screw, the nut having:(a) two nut halves, each having the internal threads and being movable as a unit and relative to each other on the screw;(b) a torsion spring joining the two nut halves to induce their relative rotation on the screw in opposite directions toward a closed abutting position to take up backlash between the screw threads and the internal threads on the nut;(c) a washer provided between faces formed on each nut half normal to the screw to create high frictional contact between the washer and the faces to limit relative rotational movement between the nut halves when the nut halves are in the closed abutting position and to permit the nut halves to translate along the rotational screw,(d) characterized in that at least one nut half forms a chamber to receive the washer and limit radial expansion of the washer.