Vehicle alarm system

Abstract

Abstract An alarm system for vehicles or the like responsive to unauthorized tampering. The circuitry includes at least two sensor arrays, each adapted to produce a signal responsive to tampering of a particular kind. In the case of an automobile, one sensor array is responsive to the opening of the trunk or hood, and its signal immediately actuates an alarm, such as sounding the horn; another sensor array, responsive to movement of the vehicle or opening of a door, produces a signal which, after a time delay of, say, 15 seconds, actuates the alarm. Another time delay circuit turns off the alarm after, say, 25 seconds. The circuitry includes arming means incorporating a third time delay, by which to arm the system after a delay of, say, one minute following the turning off of the ignition switch. The sensor responsive to the opening of the vehicle door can conveniently be connected to one terminal of the courtesy light conventionally lighted by the door opening, and the circuitry includes means adapting it to use with courtesy lights of either of the two major systems in present use, whether one terminal of the courtesy light is permanently grounded, or connected to the 12 volt source.

Inventors

• 👤 Billy R. Willis

Bibliographic Details