Emergency alarm system for static structure utilizing automobile horn

Claim 1

An alarm system for a static structure comprising an automobile, an audible signal system carried by said automobile, said system including a horn, an automobile battery, a horn switch and circuitry connecting said horn, battery and switch in series whereby closing of said switch energizes said horn to produce an audible signal, in combination therewith a protection circuit comprising a first portion carried by said static structure and including at least one normally closed alarm switch means movable to open position in response to an emergency condition, an electrical power source and circuitry connecting said alarm switch means and said source in series, a second portion carried by said automobile and including a relay coil, relay circuitry including plug and socket means for connecting one terminal of said relay coil to said power source carried by the static structure, a first relay switch connected to said horn circuit in parallel with said horn switch and a second relay switch connected by said plug and socket means in series with said alarm switch means and a second terminal of said relay coil, means biasing said first and second relay switches to a first (respectively, closed and opened) position, and means for simultaneously moving said switches to a second (respectively, opened and closed) position, whereby the opening of said normally closed alarm switch means disconnects said power source from said relay coil, allowing said relay switches to return to their first position, the first said relay switch thereby actuating said horn.