Semi-dump truck level indicator

Details Semi-dump truck level indicator Semi-dump truck level indicator

1976-02-04

1979-03-20

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

180104, 200 6147, 340689, B60Q 500, G08B 2100

Patent

active

041456823

ABSTRACT:
A semi-dump level indicator comprising an electrical system including a pair of mercury switches mounted on the rear portion of the trailer. The switches are closed when the trailer is level. When the trailer is dangerously tilted gravity causes one of the switches to open which de-energizes a relay closing a warning light and alarm buzzer circuit in parallel with the circuit having the mercury switches to warn the operator not to raise the trailer.

REFERENCES:
patent: 2782276 (1954-03-01), Woods
patent: 3013624 (1961-12-01), De Remer et al.
patent: 3464755 (1969-09-01), Brown
patent: 3728675 (1973-04-01), Horn et al.
patent: 3879703 (1975-04-01), Bonazoli et al.
patent: 3921128 (1975-11-01), Snead

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