Spring-return type actuator

Details Spring-return type actuator Spring-return type actuator

F - Mech Eng,Light,Heat,Weapons

16

K

251/13

F16K 31/44 (2006.01) B60T 17/08 (2006.01) F15B 15/08 (2006.01)

Patent

CA 1274815

ABSTRACT OF THE DISCLOSURE A spring-return type actuator for valves comprises a piston cylinder mechanism, a movement conversion-transmis- sion means disposed in the piston cylinder mechanism for converting reciprocation of a piston into a rotary motion of a valve drive shaft, a spring mechanism disposed in series relative to the piston cylinder mechanism, and a plurality of rods each having one end thereof attached to one of the opposite side walls of the spring mechanism and the other end thereof screwed into the other side wall of the spring mechanism, each comprising a male member having an external thread portion and a female member having an internal thread portion being helically meshed with the external thread portion, and each having a length set larger than the free length of a spring when assumed immediately before the leading end of the external thread portion is released from its state kept in mesh with the internal thread portion so as to prevent the one side wall of the spring mechanism from springing out and the spring from bursting out of the spring mechanism.

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