Delayed actuator with visco-elastic timer

Details Delayed actuator with visco-elastic timer Delayed actuator with visco-elastic timer

1987-05-26

1988-12-13

Scott, J. R.

Electricity: circuit makers and breakers

Retarded

Chain or flexible drive

219271, 219272, 222638, 239 70, H01H 700, F22B 128, G04C 2300, A01G 2700

Patent

active

047912510

ABSTRACT:
A delayed actuator mechanism with visco-elastic timer is provided including a support section and an actuator section mounted to the support section. A compression spring biases the actuator section in a first state and permits the actuator section to be selectively switched to a second state. In that state a cocked torsion spring urges a detent carried by the actuator into engagement with a shoulder of the support section to restrain the actuator section in the second state. A visco-elastic delay mechanism gradually relaxes the torsion spring until the compression spring overcomes the detent shoulder restraint to abruptly switch the actuator section to the first state.

REFERENCES:
patent: 2755349 (1956-07-01), Silvers
patent: 3471659 (1969-10-01), Ferrara
patent: 3907493 (1975-09-01), Thettu
patent: 4005858 (1977-02-01), Lochner
patent: 4702418 (1987-10-01), Carter et al.
patent: 4742189 (1988-05-01), Carter et al.

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