Wireless alarm system
First Claim
1. A wireless alarm system comprising:
- a transmitter for radiating a radio frequency signal in response to and during the application of electrical power to the transmitter;
a battery for providing electrical power to the transmitter;
transmitter timer circuitry for intermittently applying to the transmitter electrical power provided by the battery, the timer circuitry being electrically series-inserted between the transmitter and the battery;
switching means responsive to a predetermined alarm condition detected at the general site of the transmitter, activation of the switching means initiating operation of the transmitter timer circuitry, the operating timer circuitry intermittently applying power to the transmitter at regular predetermined intervals while the switching means remains activated, the transmitter intermittently radiating the signal in response to the intermittent application of power to the transmitter; and
a radio frequency receiver for reception of the radiated signal, the radio frequency receiver activating at least one alarm indicator in response to reception of the radiated signal, the duration of alarm indicator activation being substantially greater than the duration of the radio frequency signal radiated by the transmitter during the application of power to the transmitter by the timer circuitry.
1 Assignment
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Accused Products
Abstract
A radio receiver equipped central control unit continuously monitors at least one battery-powered remote transmitter activated in response to predetermined alarm conditions, such as open doors and windows, fire, smoke, low transmitter battery voltage, and the like. In its activated condition, the transmitter is cycled to radiate a one-second duration radio frequency signal every 30 seconds, such cycling being established by transmitter timer circuitry series-inserted between the transmitter and its battery power source. The transmitted signal is received by the central control unit which, in response to the received signal, selects and activates one or more alarm indicators for a predetermined time period. Such selection and activation of particular alarm indicators and the duration of their activation are determined by switching and timing circuitry series-inserted between the central control unit'"'"'s radio frequency receiver and the various alarm indicators.
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Citations
10 Claims
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1. A wireless alarm system comprising:
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a transmitter for radiating a radio frequency signal in response to and during the application of electrical power to the transmitter; a battery for providing electrical power to the transmitter; transmitter timer circuitry for intermittently applying to the transmitter electrical power provided by the battery, the timer circuitry being electrically series-inserted between the transmitter and the battery; switching means responsive to a predetermined alarm condition detected at the general site of the transmitter, activation of the switching means initiating operation of the transmitter timer circuitry, the operating timer circuitry intermittently applying power to the transmitter at regular predetermined intervals while the switching means remains activated, the transmitter intermittently radiating the signal in response to the intermittent application of power to the transmitter; and a radio frequency receiver for reception of the radiated signal, the radio frequency receiver activating at least one alarm indicator in response to reception of the radiated signal, the duration of alarm indicator activation being substantially greater than the duration of the radio frequency signal radiated by the transmitter during the application of power to the transmitter by the timer circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10)
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7. A wireless alarm system comprising:
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at least one transmitter for intermittently radiating at regular intervals a radio frequency signal in response to the activation of a switching means'"'"' response to an alarm condition detected at the general site of the transmitter, the transmitter being powered solely by a battery; a radio frequency receiver responsive to the radio frequency signal intermittently radiated by the transmitter, the radio frequency receiver providing an alarm actuation signal during the duration the radio frequency signal is being received; at least one alarm indicator; and receiver switching and timing circuitry electrically series-connected between the radio frequency receiver and the alarm indicator, the receiver switching and timing circuitry initiating energization of the alarm indicator for a predetermined period of time in response to the alarm actuation signal, the duration of energization of the alarm indicator being substantially greater than the duration of the alarm actuation signal provided by the radio frequency receiver. - View Dependent Claims (8)
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Specification