Safety device for a mechanical transmission by means of a blocking gearing

摘要

The device has a screw spindle (9) mounted in a plane parallel to shafts (7, 8) that are fixed in walls of a case and rotated between the walls of the case. The spindle has a sliding gear, a fixed anti-friction ring (11) and a floating anti-friction ring, where the rings assure static braking of the spindle so that a reducer is in irreversible functioning situation. A driving bolt provided in the gear drives the spindle so that the spindle is shifted and detached from a needle thrust bearing (16) in forming a clearance that is sufficient to temporarily suppress irreversibility function.