Low friction self locking screw jack - has friction contact between nut components increased by rotary member positioned by plain bearing (BR 23.5.78)

摘要

The low-friction self-locking screw jack has rotary component parts in frictional contact. To give a self-locking action in one direction, the smooth-running action between the components of the nut (3, 8) is replaced or supplemented by frictional contact between them. There may be a rotary member (6) between the one component (3) positioned by means of a plain bearing, the one component (8) rotating and in frictional contact with it. The nut can be formed by planetary rollers, one at least of which has a free wheel (6). The planetary rollers (8) can rotate on spindles (3) by means of bearings (4, 7), the spindles rotating in a housing (2) in the nut by means of plain bearings, while a free wheel is mounted between one roller and its corresponding spindle.