Communications: electrical – Land vehicle alarms or indicators – For trailer
Patent
1994-01-24
1995-07-18
Hofsass, Jeffrey A.
Communications: electrical
Land vehicle alarms or indicators
For trailer
340687, 280432, 280511, G08B 2100
Patent
active
054345529
ABSTRACT:
A trailer hitch security system has a first audible alarm to alert the driver of a towing vehicle of a loose connection with the trailer, and of a loose connection between the ball of the trailer hitch and the towing vehicle's frame. The system also has two visual indicators alerting the driver of the state of the coupling between the trailer and the vehicle. A second audible alarm is automatically activated if the vehicle's ignition is turned off and an unauthorized removal of the trailer is attempted. The second audible alarm is loud and intermittent, thus alerting the driver of unauthorized unhitching, or theft, of the trailer. The loud alarm may be turned off only from within the cab of the vehicle, as returning the trailer to the towing vehicle's ball will not deactivate it. The second audible alarm is tied to a timer which limits the sounding of the second audible alarm to a preset time interval.
REFERENCES:
patent: 2564520 (1951-08-01), Blasdell
patent: 3710370 (1973-01-01), Quilici et al.
patent: 4430637 (1984-02-01), Koch-Ducker et al.
patent: 4593264 (1986-06-01), Engle
patent: 4627633 (1986-12-01), Gehman et al.
patent: 5028907 (1991-07-01), Windeler
patent: 5159312 (1992-10-01), Engle
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