Communications: electrical – Land vehicle alarms or indicators – For trailer
Patent
1989-07-17
1991-01-29
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
For trailer
340440, 340689, 340673, 340671, 280432, G08B 2100
Patent
active
049889745
ABSTRACT:
A warning and safety system for tractor-trailer dump trucks to indicate that the raised trailer is in a precarious position and in danger of tipping over, which system measures the pivot angle or the angle of revolution of the front end of the trailer. When the raised trailer is in an unstable position and begins to tip over, the front end of the trailer pivots on the hydraulic telescoping cylinder extending from the fifth wheel of the trailer. Mounted directly onto to hydraulic telescoping cylinder is an instrument sensitive to angular motion, or, alternatively, mounted on the fifth wheel of the tractor is a pivoting canister containing that instrument, from which a cable extends, parallel to the hydraulic telescoping cylinder, to the bottom of the front end of the trailer, where the cable engages with a pulley arrangement securely mounted on the cylinder well of the trailer. When the warning and safety system detects that the tipping angle of the trailer is equal to or greater than predetermined, but adjustable, critical angles, various first stage and second stage alarms are triggered. The first stage alarms may comprise audio and visual alarms, whereas the second stage alarms automatically dump the oil from the hydraulic telescoping cylinder back into the oil reserve tank and immediately lower the trailer. The location of the pivoting canister on the fifth wheel prevents spurious false alarms, as does the time-delayed dampened instrumentation within the canister. Power is supplied automatically to the warning and safety system either by using a pressure-sensitive switch which turns on the system as soon as the trailer is raised a small distance, or by wiring a switch into the gate-release switch.
REFERENCES:
patent: 3640578 (1972-02-01), Finney
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patent: 3921128 (1975-10-01), Snead
patent: 4216996 (1980-08-01), Pitts
patent: 4221530 (1980-09-01), Williams et al.
patent: 4349809 (1982-09-01), Tomes
patent: 4658508 (1987-04-01), Oberg
patent: 4682145 (1987-07-01), Brawner, Jr.
patent: 4737759 (1988-04-01), Stropkay et al.
Bailey Gerald D.
Fury Tommy J.
Crosland Donnie L.
Morgan DeWitt M.
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