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

G - Physics

05

D

214/1, 341/108,

G05D 15/01 (2006.01) B66F 17/00 (2006.01)

Patent

CA 1064144

ABSTRACT An electrical alarm system, which responds to improper and/or unsafe loading of a fork-lift truck or other load-sustain- ing apparatus equipped with a suitable sensing transducer, is controlled by a high-gain electronic differential switch whose comparisons of reference and sensing-transducer electrical sig- nals are uniquely improved by a combination of: (a) unidirection- ally-positive feedback which produces a dynamic transient hyster- esis effect; (b) steady-state feedback or hysteresis which pre- vents false triggering of the system by ambient noise and vibra- tion; (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. Failsafe 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.

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