Switches and circuits for solenoid control

Details Switches and circuits for solenoid control Switches and circuits for solenoid control

1998-05-26

1999-11-02

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

307113, 307115, 307116, H01H 104, H02B 124

Patent

active

059776617

ABSTRACT:
Switching systems are provided for fail-secure and fail-safe solenoid operated locks, and are designed to maintain the solenoid cool during activation during normal operation when the solenoid is continuously supplied with current. The switching system comprises a dual action switch with electrical contacts providing for momentary high electric power during initial activation of the solenoid operated lock, and also providing a low power continuous current to maintain the solenoid cool during continuous activation. The switching system comprises a push-on, push-off switch, and a normally-open switch connected in series with a transformer and the solenoid operated lock, to provide a high electrical power to the solenoid when both switches are closed. A resistor is connected in parallel with the normally-open switch, such that when the normally-open switch is opened, a low power maintenance current is supplied through the resistor to maintain the solenoid activated with low power to maintain the solenoid cool during continuous activation.

REFERENCES:
patent: 3571564 (1971-03-01), Welch
patent: 3708180 (1973-01-01), Bird
patent: 3721866 (1973-03-01), McIntosh
patent: 4142221 (1979-02-01), Jenkins et al.
patent: 4423336 (1983-12-01), Iverson et al.
patent: 4800741 (1989-01-01), Kerschenbaum et al.
patent: 5246258 (1993-09-01), Kerschenbaum et al.

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