Fail-safe time delay circuit

Details Fail-safe time delay circuit Fail-safe time delay circuit

1976-05-14

1977-11-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361203, 361205, H01H 4718

Patent

active

040598454

ABSTRACT:
A fail-safe time delay circuit comprising a detection relay for sensing the presence and absence of an input signal, a switching relay for assuming a first and a second condition in accordance with the presence and absence of the input signal, and a programmable unijunction transistor oscillating circuit, a silicon controlled rectifier gating circuit and a d.c. making circuit including a solid-state Colpitts oscillator and half-wave rectifier controlled by the second condition of the switching relay for providing a predetermined time delay period between the disappearance and the reappearance of the input signal prior to permitting the switching relay reassume its first condition.

REFERENCES:
patent: 3407340 (1968-10-01), Hofnagel
patent: 3411020 (1968-11-01), Lake
patent: 3694702 (1972-09-01), Popp
patent: 3873893 (1975-03-01), Bianchini

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