Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1991-12-16
1993-03-23
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340573, 455100, G08B 108, G08B 2300
Patent
active
051968258
ABSTRACT:
An apparatus is provided for monitoring the location of a person and for determining whether the person is in distress. The apparatus includes a transmitter and a transceiver, which are adapted to be worn at different locations on the person's body. The transmitter normally transmits a first electromagnetic signal, which is detectable by the transceiver and by at least one remote receiver. When the person is in distress, the transmitter transmits a second electromagnetic signal in lieu of the first signal. The transceiver is responsive to the second signal for generating a third electromagnetic signal, which also indicates that the person is in distress. The remote receiver is responsive to either or both of the second and third signals for generating an alarm signal indicating the distress condition. The transceiver also generates the third signal in response to the absence of the first signal, which may occur when the transmitter is removed from the person's body and the distance between the transmitter and transceiver becomes too great for the transceiver to receive the first signal, or due to transmitter malfunctional. The third signal therefore provides a redundancy feature in the event of failure of the transmitter to generate the second signal. The apparatus not only allows the person's location to be continuously monitored, but also indicates when the person is in need of assistance.
REFERENCES:
patent: 4598272 (1986-07-01), Cox
patent: 4792796 (1988-12-01), Bradshaw et al.
patent: 4853692 (1989-08-01), Wolk et al.
patent: 4924211 (1990-05-01), Davies
Crosland Donnie L.
McCord W. Kirk
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