Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1992-09-29
1994-12-20
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361190, 307 99, 307132EA, H02H 326, H01H 4702
Patent
active
053750276
ABSTRACT:
A fail-safe circuit for preventing an inadvertent communication of a signal from an input terminal to an output terminal includes a series switching network electrically connected between the input terminal and the output terminal. The series switching network contains two switching circuits electrically connected in series. One switching circuit is an electrical switching circuit and the other is an electromechanical switching circuit. The switching circuits are chosen such that defects causing the electrical switching circuit to short circuit do not affect the electromechanical switching circuit and defects causing the electromechanical switching circuit to short circuit do not affect the electrical switching circuit. The fail-safe circuit also includes circuitry for preventing inadvertent communication of the signal from the input terminal through the series switching network to the output terminal when one of the switching circuits is in a short circuited state or condition. This circuitry includes a circuit system for detecting a short circuit condition in the series switching network. Also included is another circuit system that is responsive to a short circuit condition within the series switching network for preventing the closing of the switching network to prevent communication of the signal from the input terminal through the series switching network to the output terminal.
REFERENCES:
patent: 3445172 (1969-05-01), Zielinski
patent: 3626248 (1971-12-01), Bartlett et al.
patent: 3696364 (1972-10-01), Lavelle
patent: 4599675 (1986-07-01), Fisher et al.
patent: 4845475 (1989-07-01), Cooledge et al.
patent: 4977478 (1990-12-01), Powell
patent: 5261694 (1993-11-01), White et al.
Bledsoe Jeffrey P.
Carra William M.
Dillon Andrew J.
Gaffin Jeffrey A.
General Dynamics Corporation
Leja Ronald W.
Yee Duke W.
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