Communications: electrical – Selective – Having indication or alarm
Patent
1986-08-29
1988-04-12
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
340689, 200 6152, B60Q 100, G08B 2100
Patent
active
047377593
ABSTRACT:
A level warning device for dump trucks comprises a light transmissive tubular trackway having raised, closed ends and a mount for securing the tubular trackway to a transverse member of the bed of the truck. The trackway includes a detent at a central location which defines a pocket lateral of the passage defined within the trackway. The trackway itself comprises straight, tubular segments which are inclined with respect to a horizontal axis at angles equal to the critical angle at which the truck would likely start to turn over. Positioned above a central region of the trackway is a photo-electric switch. Optically aligned with the photo-electric switch from below the trackway is an element for emitting an infra-red beam through the tubular element. A ball which is sized to roll freely in the trackway and the pocket is held within the detent pocket while the bed is in a lowered position by reason of the inclination of the detent at such conditions. While in the pocket, a portion of the ball prevents the beam from striking the photo-electric switch.
REFERENCES:
patent: 3269685 (1966-08-01), Wallace
patent: 3464755 (1969-09-01), Brown
patent: 3601729 (1971-08-01), Hierta
patent: 3694803 (1972-09-01), Strenglein
patent: 3784773 (1974-01-01), Jubenville
patent: 3967135 (1976-06-01), Balban et al.
patent: 4074227 (1978-02-01), Kalmus
patent: 4349809 (1982-09-01), Tomes
patent: 4450431 (1984-05-01), Hochstein
patent: 4484191 (1984-10-01), Vavra
Boucher Robert W.
Stropkay Edward J.
Rowland James L.
Transgard, Inc.
Tumm Brian R.
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