Low profile air jack

Details Low profile air jack Low profile air jack

1976-04-09

1976-11-23

Smith, Al Lawrence

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

254127, B66F 324

Patent

active

039932869

ABSTRACT:
A low profile air jack for lifting vehicles is described, in which the force exerted by a horizontally disposed air cylinder and piston assembly on the lever arm of a lifting member pivoted to the jack frame causes the lifting member to rotate, so that its front end engages and lifts the vehicle. The piston shaft of the air cylinder is connected to the lever arm of the lifting member by a flexible chain and sprocket assembly which acts as a force-multiplying mechanism so that the force acting on the lever arm of the lifting member is approximately double the force which would be exerted if the piston shaft were directly connected to the lever arm by a rigid member. The two flexible chains are connected to a stabilizing bar, which is pivotably attached to the jack frame for both vertical and horizontal movement thereto, rather than directly to the frame, so that equal forces are applied to both chains during the lifting operation.

REFERENCES:
patent: 1813429 (1931-07-01), Sexton
patent: 2476380 (1949-07-01), Manke
patent: 2489056 (1949-11-01), Stewart
patent: 3052323 (1962-09-01), Hopfeld
patent: 3168284 (1965-02-01), Fisher
patent: 3664635 (1972-05-01), Kincad
patent: 3854699 (1974-12-01), Garnett

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