Lifting apparatus

Details Lifting apparatus Lifting apparatus

1974-10-07

1976-02-24

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

212 1, 212 39MS, 323 22Z, B66D 100

Patent

active

039401103

ABSTRACT:
A lifting apparatus provided with a weight limit setting device which sets a limit to the weight of a load so that the lifting apparatus can safely lift a load. The device comprises a spring member the top end of which moves vertically in response to the weight of a load, a potentiometer for producing an output signal in proportion to the vertical movement of the spring member, and a comparator for comparing the output signal with a reference signal, whereby no load heavier than the limit thus set is lifted even if the lifting apparatus is operated to lift the load.

REFERENCES:
patent: 3129686 (1964-04-01), Sakson
patent: 3199685 (1965-08-01), Bopp
patent: 3426263 (1969-02-01), Hennigan et al.
patent: 3838656 (1974-10-01), Greene

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