Patent ID: 6725975
Filing Date: 2004-04-27
Classification: F15B

Abstract:
A rotary actuator assembly comprising:a rotary actuator; and a device for positioning the rotary actuator, the device being coupled to the actuator and comprising a rotatably mounted coupling shaft, one end of said shaft being coupled to an output of the rotary actuator, and first and second resilient biasing means for respectively applying oppositely directed torques to the coupling shaft, said first biasing means urging the shaft in a clockwise direction towards a stop position and said second biasing means urging the shaft in an anticlockwise direction towards said stop position and being discrete from said first resilient biasing means; and wherein the biasing means act on the shaft through a coupling assembly arranged so that the first biasing means urging the coupling shaft in a clockwise direction towards said stop position is uncoupled from the shaft when the shaft rotates in a clockwise direction beyond the stop position and the second biasing means urging the coupling shaft in an anticlockwise direction towards said stop position is uncoupled from the shaft when the shaft rotates in an anticlockwise direction beyond the stop position.