Alarm system prior to firedoor drop
First Claim
1. A warning system, having a power supply, for generating a warning signal in response to either of two events, detection of smoke by a smoke detector or failure of external power supply to the system, comprisingcontrol means connected to an element to which power is supplied and being responsive to such element when power is not supplied thereto for generating a first control signal,a first timer means connected to said element and being responsive thereto for generating a second control signal at the end of a first delay interval,a second timer means connected to said first timer means and being responsive to said second control signal for generating a series of reoccurring control pulses, andsignal means connected to said second timer means and being responsive to said control pulses for generating a series of warning signals.
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Accused Products
Abstract
A signalling system utilized in a firedoor control system. For warning and alerting personnel of the immanate (seconds) closing of a firedoor, to avoid injury of such personnel in the vicinity of the closing firedoor. The system is actuated by being responsive to either a smoke detector signal or to an electrical failure to the smoke detector. Means responsive to the smoke detector generates a first control signal, a first timer means generates a second control signal at the end of a first delay interval, and a second timer means generates a series of reoccurring control pulses transmitted to audible and visual signalling elements. A test means is provided to determined operational (functional) status of a rechargable battery utilized in the system in the event of an electrical failure to the smoke detector.
31 Citations
20 Claims
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1. A warning system, having a power supply, for generating a warning signal in response to either of two events, detection of smoke by a smoke detector or failure of external power supply to the system, comprising
control means connected to an element to which power is supplied and being responsive to such element when power is not supplied thereto for generating a first control signal, a first timer means connected to said element and being responsive thereto for generating a second control signal at the end of a first delay interval, a second timer means connected to said first timer means and being responsive to said second control signal for generating a series of reoccurring control pulses, and signal means connected to said second timer means and being responsive to said control pulses for generating a series of warning signals.
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8. In a firedoor control system having a smoke detector and a firedoor time-delay release mechanism responsive thereto for delaying the closing of the firedoor following either the detection of smoke or a loss of voltage to the smoke detector, the improvement comprising a warning system, having a power supply, for generating a warning signal in response to either of two events, detection of smoke by the smoke detector or failure of external power supply to the firedoor control system, which warning system comprises:
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control means connected to said smoke detector and being responsive thereto for generating a first control signal, a first timer means connected to said smoke detector responsive means and being responsive thereto for generating a second control signal at the end of a first delay interval, a second timer means connected to said first timer means and being responsive to said second control signal for generating a series of reoccurring control pulses, and signal means connected to said second timer means and being responsive to said control pulses for generating a series of warning signals. - View Dependent Claims (9)
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10. A system apparatus for warning of a firedoor closing prior to initiation of the closing of the firedoor comprising
a firedoor-and-hood assembly having a release means, a time-delay release mechanism operatively connected to said release means, at least one smoke detector operatively connected to said time-delay release mechanism, and an electronic circuitry connected in parallel to said time-delay release mechanism and smoke detector for warning of the closing of the firedoor prior to actuation of said time-delay release mechanism.
Specification