Electronic perimeter warning system

Details Electronic perimeter warning system Electronic perimeter warning system

1994-10-21

1996-09-10

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

250221, 340552, G08B 1318

Patent

active

055549721

ABSTRACT:
Apparatus and method are disclosed to provide an electronic perimeter warning system to prevent the ingress or egress of persons or machines from a selected area such as in an area along the perimeter of a roof under construction. Battery powered signal transmitters and receivers establish a signal beam between two locations. When the continuity of the signal beam is broken, an alarm is sounded to warn the person who is crossing the signal beam of imminent danger.

REFERENCES:
patent: 4187501 (1980-02-01), Olesch
patent: 4191953 (1980-03-01), Woode
patent: 4760381 (1988-07-01), Haag
patent: 5198799 (1993-03-01), Pascale

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