WORM SCREW JACK APPARATUS AND METHOD OF MAKING SAME

摘要

A worm screw jack having a worm (2) meshing with a worm gear (4) that is drivingly connected to a lifting screw (9) is provided with an antibacklash device. The anti-backlash device comprises a sleeve (6) positioned axially along the lifting screw (9) from the worm geat (4), the sleeve (6) being secured to the worm gear (4) by a shoulder fromed on the worm gear (4) and a mating recess provided on the sleeve (6). The axial length of the sleeve (6) is preferably 8% less than the pitch of the lifting screw (9).