An actuator.

摘要

An actuator comprises an output member 4 a piston 6 for driving the output member and a cushioning spring 8 through which the piston 6 transmits its drive. The piston is arranged so that it loads the spring 8 in one direction when moving the output member in that direction and loads the spring 8 in the opposite direction when moving the output member in said opposite direction. A return spring 16 is provided for moving the output member back towards a neutral position N after being moved from the neutral by the piston.