Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1991-08-21
1992-03-17
Hartman, J. J.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254122, B66F 324
Patent
active
050961608
ABSTRACT:
A scissor jack of the type which is mountable on and usable in conjunction with a conventional automotive vehicle lift to permit a selected axle of the vehicle to be elevated relative to the lift. The invention provides a gravity activated locking mechanism which includes a plurality of lock keys of different widths. The keys fall individually into a lock position as the jack rises incrementally in height, to prevent unintended lowering of the jack at any height or any time during the lifting process.
REFERENCES:
patent: 2070960 (1937-02-01), Phillips
patent: 2725578 (1955-12-01), Keller
patent: 3174722 (1965-03-01), Alm
patent: 3994474 (1976-11-01), Finkbeiner
patent: 4087895 (1978-05-01), Etienne
Calico Gregory M.
Hill Ronald L.
Spillyards Judson D.
FMC Corporation
Hartman J. J.
Megley Richard B.
Oxenham J. Preston
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