Linear actuators and linear drive systems

Details Linear actuators and linear drive systems Linear actuators and linear drive systems

1989-10-13

1991-10-01

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 20, 25112911, H02K 706, F16K 3104

Patent

active

050536605

ABSTRACT:
A linear actuator 30 set up as a powered valve comprises a stator 32 secured within a frame 34 and a rotor 38 mounted on a pair of half-shafts 40. Within the rotatable assembly are internally-threaded and oppositely-handed drive nuts 44 and 46 which are each secured to the half-shafts 40 for conjoint rotation with the rotor 38. A pair of driven members 48 and 50 are provided. The driven member 48 is externally threaded to match the internal thread of the driving nut 44, and similarly, the driven member 50 is externally threaded to match the internal thread of the driving nut 46. Since the two sets of corresponding male/female threads are oppositely handed, energization of the stator 32 to turn the rotor 38 will actuate the driven members 48 and 50 in mutually opposite directions and as the adjacent ends of the driven members 48 and 50 are formed respectively as a valve seat 54 and a valve plug 56 the valve can be opened or closed.

REFERENCES:
patent: 2956188 (1960-10-01), White
patent: 3461805 (1969-08-01), Karkow
patent: 4145165 (1979-03-01), Perkins et al.
patent: 4277706 (1981-07-01), Isaacson
patent: 4789132 (1988-12-01), Fujita et al.

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