Fail-safe attachment for an actuator

Details Fail-safe attachment for an actuator Fail-safe attachment for an actuator

1979-03-19

1981-09-15

Herrmann, Allan D.

Machine element or mechanism

Automatic operation or control

185 39, 251 69, G05G 1700, F03G 100

Patent

active

042890381

ABSTRACT:
An actuator has a fail-safe mechanism operable by a spring. The spring is normally held inoperable by electrical means so that the fail-safe mechanism is independent of the normal operation of the actuator. The fail-safe mechanism is rendered operative by failure of the electrical supply so that the spring rotates a cam plate which is coupled with the switch plate so as to move the output shaft to a predetermined fail-safe position by the stored energy of the spring force.

REFERENCES:
patent: 1134892 (1915-04-01), Myszkier
patent: 1559018 (1925-10-01), Taylor
patent: 2568916 (1951-09-01), Godefroy
patent: 2875616 (1959-03-01), Marks
patent: 4113063 (1978-09-01), Troy

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