Perimeter alarm apparatus

Details Perimeter alarm apparatus Perimeter alarm apparatus

1977-03-08

1979-01-23

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

179 82, 325 29, 340531, 340568, H04B 500

Patent

active

041363388

ABSTRACT:
A perimeter alarm apparatus includes a loop of wire to be placed around an area to be guarded and electrical circuitry connected with the loop for detecting the absence of a signal imposed on the loop. The signal imposed on the loop is produced by a sending unit worn by a child, for example, who is intended to remain within the area bounded by the loop. As long as the child is within the area, the sending unit will induce a signal on the loop, but when the child moves beyond the loop a predetermined distance, no signal is imposed on the loop, with the result that an alarm is sounded by the circuitry.

REFERENCES:
patent: 3115622 (1963-12-01), Jaffe
patent: 3665449 (1972-05-01), Elder et al.
patent: 3673334 (1972-06-01), Turner
patent: 3868565 (1975-02-01), Kuipers

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