Truck overload protective system having trip signal sampling mea

Details Truck overload protective system having trip signal sampling mea Truck overload protective system having trip signal sampling mea

1975-04-03

1977-01-18

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 39MS, 340267C, B65E 4700

Patent

active

040034879

ABSTRACT:
An overload protective system continuousy monitors the forward overturning moment on a counterbalanced lift truck and prevents further raising of the carriage or further forward tilting of the mast when the tilting moment is excessive. A strain gage sensor connected in an electrical bridge derives a strain signal proportional to the mechanical strain in a load carrying anchor pin for the tilt jack which resists the forward overturning moment acting on the truck; a differential amplifier raises the level of the strain signal; a comparator which receives the output of the differential amplifier derives a trip signal when the strain signal reaches a predetermined magnitude; a shift register receiving clock pulses from an oscillator as a time reference records the history of the comparator output and a decoder analyzes the shift register output and sets a latch when the trip signal comparator output has been present for a predetermined interval of time; and disabling means responsive to setting of the latch de-energize operating coils for blocking valves which inhibit further raising of the carriage or further forward tilting of the mast.

REFERENCES:
patent: 3203672 (1965-08-01), Santos
patent: 3591030 (1971-07-01), Pachter
patent: 3631537 (1971-12-01), Zibolski et al.
patent: 3638211 (1972-01-01), Sanchez
patent: 3819922 (1974-06-01), Horn et al.
patent: 3850323 (1974-11-01), Ekstrom

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