Lift truck safety system having protection against component fai

Details Lift truck safety system having protection against component fai Lift truck safety system having protection against component fai

1977-04-20

1978-11-21

Oresky, Lawrence J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340685, B66F 920

Patent

active

041262379

ABSTRACT:
A fork lift truck has an overload protective circuit which is responsive to an excessive tilting moment acting on the truck, as a result of a load on the raised carriage, to disable the mast tilting motor and carriage elevating motor from shifting the load supporting carriage in a direction which would increase the forward tilting moment and also has a crowbar circuit which, upon failure of the protective system to respond properly to such excessive tilting moment, opens an electrical circuit that also results in inhibiting the mast tilting and carriage elevating motors from further raising the carriage or further forward tilting of the mast on the overloaded truck, thereby providing enhanced protection against faulty operation resulting from component failure. One embodiment permits the truck operator to selectively simulate an overload and thereby initiate testing for component failure in the overload protective system. Another embodiment is self-testing and simulates an overload to thereby initiate testing for component failure each time the truck electrical system is turned on.

REFERENCES:
patent: 3866200 (1975-02-01), Paredes et al.
patent: 3951467 (1976-04-01), Fleagle
patent: 3993166 (1976-11-01), Senour
patent: 4003487 (1977-01-01), Downing
patent: 4013324 (1977-03-01), Quon

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