Lifting jack

Details Lifting jack Lifting jack

1979-12-17

1981-02-03

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Metallic spring stretcher and/or compressor

B66F 502

Patent

active

042484057

ABSTRACT:
A lifting jack for vehicles having three sets of parallelogram linkages in itself for a substantially vertical or, alternatively, forwardly slanted motion of a lifting head is provided so as to reduce the hazard of a vehicle falling off a lifting head due to slippage between the lifting head and the portion of the vehicle bottom at which the lifting head is applied. The lifting head of conventional swing arm type lifting jacks usually moves backward, or away from the vehicle, as it is elevated while the portion of the vehicle bottom at which the lifting head is applied usually moves forward, or away from the lifting jack, as the vehicle is lifted up.

REFERENCES:
patent: 2402572 (1946-06-01), Page
patent: 2587067 (1952-02-01), Sachtleber
patent: 3632085 (1972-01-01), Traywick

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