Electric-powered spring-return actuating device

Details Electric-powered spring-return actuating device Electric-powered spring-return actuating device

1986-05-27

1987-06-30

Shoop, Jr., William M.

Electricity: motive power systems

Having rotor element biased against rotation

By resilient biasing means

318 9, 318 40, 318 54, 251 25, 25112911, F16K 3104

Patent

active

046773550

ABSTRACT:
Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical signal or power failure; said actuating device having electrical amplifying means capable of providing pulsed current to drive said motor in one direction in response to an input signal, a constant current to hold said motor in a selected position, or no power, to allow the mechanical and spring means to reverse the motor direction; additional means are provided to limit the travel to a selected position despite further increases in input signal.

REFERENCES:
patent: 3150752 (1964-09-01), Baumann
patent: 3682283 (1972-08-01), Sato
patent: 3987818 (1976-10-01), Williams
patent: 4097786 (1978-06-01), Lund
patent: 4609176 (1986-09-01), Powers
patent: 4613798 (1986-09-01), Baumann

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