Importance

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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.

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First Claim