| 摘要 |
The present invention provides an actuator mechanism comprising an axially rotatable actuator shaft and an actuator member which, in use, can be moved axially to actuate a brake. The actuator shaft and actuator member are interconnected by an assembly which comprises a first fast thread and a second fast thread. The first fast thread has a greater pitch angle than said second fast thread and is arranged to, in use, move the actuator member to take up any slack to cause friction surfaces of the brake to interengage. Said second thread subsequently moves the actuator member to apply the brake. By this arrangement the advantages of the two types of fast thread are utilized, the first fast thread quickly taking up the shock and the second fast thread being capable of applying the brake.
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