ADJUSTABLE FAIL-SAFE ROTARY SPRING OPERATOR WITH A RETAINING BAND

摘要

A rotary spring-return actuator (10) operator is provided with a multi-slot shaft (40) and a clock type spring (34) retained by a retaining band (32) which encircles the spring (34) in such a manner as to insure that the potential energy within the spring (34) is safely con¬ tained during all operations requiring disassembly of the actuator assembly (12), and wherein the retaining band (32) facilitates the infield reversal of the spring direction or the adjustment of the spring preload by securing the spring (34) to one or more of the slots on the multi-slot shaft (40).