Overload signalling system for fork lift trucks and the like

Details Overload signalling system for fork lift trucks and the like Overload signalling system for fork lift trucks and the like

1975-04-29

1976-11-23

Paperner, L. J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

214674, 340267C, B66B 920

Patent

active

039931668

ABSTRACT:
An electrical alarm system, which responds to improper and/or unsafe loading of a fork-lift truck or other load-sustaining apparatus equipped with a suitable sensing transducer, is controlled by a high-gain electronic differential switch whose comparisons of reference and sensing-transducer electrical signals are uniquely improved by a combination of: (a) unidirectionally-positive feedback which produces a dynamic transient hysteresis effect; (b) steady-state feedback or hysteresis which prevents false triggering of the system by ambient noise and vibration; (c) a regulator and electrical interference suppression network; and (d) low-level high-frequency partial filtering of oscillations in the waveform of sensing-transducer output signals. Fail-safe system operation is assured by network connections and output actuations which prevent the handling of loads when system cabling is disabled, as well as when overloading is sensed.

REFERENCES:
patent: 3710368 (1973-01-01), Hamilton
patent: 3724679 (1973-04-01), Brownell et al.
patent: 3833932 (1974-09-01), Hamilton
patent: 3850323 (1974-11-01), Ekstrom
patent: 3913081 (1975-11-01), Hamilton

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