Brake or clutch assembly for truck or drill platform has a stop preventing engagement of two sets of contacts

摘要

A brake or a clutch has two aggregate units (10, 20) that rotate with respect to each other on the same main axis (10, 20), or remain fixed with respect to each other. The second aggregate unit (20) is limited in its motion by a stop (54) keeping inner contacts (34, 36) from contact with outer contact surfaces (14a, 12c) when the two aggregate units are de-coupled.