Patent ID: 6748816
Filing Date: 2004-06-15
Classification: F16H,Y10T

Abstract:
A self-backdriving jackscrew apparatus for returning or reducing resistance to the return of a jackscrew nut to a home position on a jackscrew shaft, the apparatus comprising:a nut supported for reciprocal translational motion and against rotational motion and having internal helical threads; a screw having external helical threads complementing and threadedly engaging those of the nut, the screw being supported for rotation about a longitudinal screw axis to drive the nut in a driven direction along the longitudinal screw axis when the screw is rotated in a first direction about the screw axis and to backdrive the nut opposite the driven direction when the screw is rotated about the screw axis in a second rotational direction opposite the first rotational direction; and a biasing member fixedly connected to the screw at one end and fixedly connected to a structure fixed against rotation at an opposite end, the biasing member being configured to exert backdriving force on the screw that turns the screw in the second rotational direction about the screw axis.