초록 ▼

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

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.

대표청구항 ▼

An electronic perimeter warning system comprising, in combination: (a) a plurality of signal transmitting means for transmitting detectable signal beams; (b) a plurality of signal receiving means for receiving said detectible signal beams transmitted by said plurality of signal transmitting means; (

An electronic perimeter warning system comprising, in combination: (a) a plurality of signal transmitting means for transmitting detectable signal beams; (b) a plurality of signal receiving means for receiving said detectible signal beams transmitted by said plurality of signal transmitting means; (c) said plurality of signal transmitting means and said plurality of signal receiving means being movably positionable in spaced apart relationship wherein the plurality of receivers and transmitters define an enclosed perimeter such that said detectable signal beams are transmitted continuously therebetween; (d) sensing means electrically connected to each signal receiving means for detecting when the transmission of said detectable signal beam between one of said signal transmitting means and one of said signal receiving means has been interrupted; (e) a plurality of alarm means to provide audible signals to persons in the area in which the warning system is located; (f) a plurality of alignment adjustment means each electrically connected to one of said signal receiving means for detecting when the transmission of said detectible signal beam between one of said signal transmitting means and one of said signal receiving means has been established and providing a visual signal to persons in the area in which the warning system is located; and (g) a plurality of electrical circuit means each functionally interconnecting one of said sensing means, said alignment adjustment means and said alarm means to activate said respective alarm means when continuity of said detectible signal has been interrupted and to activate said visual signal of said alignment adjustment means when said detectible signal has been established between said signal transmitting means and said signal receiving means.