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Abstract

The invention comprises a method for operating a door hold-open device and a device for carrying out the method. A door hold-open device which unlatches a held door based upon the occurrence of an unlatch condition includes a door latching mechanism, a signal processing circuit having a power source. The method consists of the steps preventing the signal processing mechanism from consuming electrical current, upon occurrence of an unlatch condition, generating a unlatch condition signal and providing electrical current to the signal processing mechanism to power it, determining the continued existence of the unlatch condition signal with the signal processing mechanism and upon determination of the continued existence of the unlatch condition signal with the signal processing mechanism, transmitting an electrical unlatch signal to the door latching mechanism. A device capable of carrying out these steps includes door latching mechanism, a signal processing circuit such as a microprocessor having data input and output ports, a power source mechanism, the data output port being operatively connected to the door latching mechanism to enable unlatching of the door latching mechanism, a switch mechanism for selectively providing an electrical power supply to the signal processing circuit power source, and an unlatch condition signal mechanism connected to the signal processing mechanism data input port and to the switch mechanism, whereby upon generation of an unlatch condition signal, the switch mechanism provides power to the power source of the signal processing mechanism.

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First Claim