Remote switching device for smoke detector
First Claim
1. A switching device for a smoke detector of the dry-cell operated type, including a casing adapted to be secured to a ceiling, or similar out-of-reach elevated location, a smoke-detecting and alarm circuit with positive and negative connectors adapted to be connected to a dry-cell battery in said casing, said device comprising a housing adapted to be secured to an accessible location below said smoke detector, a holding relay having a winding and an armature, a dry-cell battery, a pair of terminals and a time-delay circuit located in said housing, said terminals adapted to be connected by wires to said connectors in said casing;
- said battery in said housing connected to said armature and parallel-connected to one of said terminals and to said winding;
the latter in turn connected to said time delay circuit, said armature having a first normal position in which it connects said battery across said terminals, and a second position held by said winding in which it disconnects said battery from the other of said terminals and connects said battery to said time-delay circuit, and spring means to return said armature to said first position upon opening of said time-delay circuit.
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Accused Products
Abstract
A switching device is enclosed in a casing fixed to a wall below a ceiling-mounted conventional smoke detector, so as to be accessible. The switching device includes a holding relay, a dry-cell battery and a time-delay circuit. The dry-cell battery replaces a similar battery normally in the smoke detector itself. In normal position, the holding relay connects the battery of the switching device to the circuit of the smoke detector. Whenever the smoke detector sounds a false alarm, a house occupant actuates the holding relay to disconnect the smoke detector circuit and stop the alarm. The battery in the switching device thereafter is connected to the time-delay circuit which returns the holding relay to its normal position after a period of, say, twenty minutes.
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Citations
7 Claims
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1. A switching device for a smoke detector of the dry-cell operated type, including a casing adapted to be secured to a ceiling, or similar out-of-reach elevated location, a smoke-detecting and alarm circuit with positive and negative connectors adapted to be connected to a dry-cell battery in said casing, said device comprising a housing adapted to be secured to an accessible location below said smoke detector, a holding relay having a winding and an armature, a dry-cell battery, a pair of terminals and a time-delay circuit located in said housing, said terminals adapted to be connected by wires to said connectors in said casing;
- said battery in said housing connected to said armature and parallel-connected to one of said terminals and to said winding;
the latter in turn connected to said time delay circuit, said armature having a first normal position in which it connects said battery across said terminals, and a second position held by said winding in which it disconnects said battery from the other of said terminals and connects said battery to said time-delay circuit, and spring means to return said armature to said first position upon opening of said time-delay circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- said battery in said housing connected to said armature and parallel-connected to one of said terminals and to said winding;
Specification