Implements or apparatus for applying pushing or pulling force – Single throw lever – Mechanically actuated
Patent
1976-06-15
1977-07-19
Jones, Jr., James L.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Mechanically actuated
B66F 300
Patent
active
040364747
ABSTRACT:
This invention is directed to a wheel-mounted portable jack which is capable of lifting large objects from a minimum ground clearance to a considerable height without resetting. The structure of the jack includes an upper member and a lower frame member pivotally attached together and movable between a normally contracted position and an expanded position under the control of lift means extending between a base and the upper frame. The lift means is operative to actuate the frame members simultaneously to advance from a collapsed or closed position in which the frame members are in parallel, horizontal relation to each other to an extended or open position in which the frame members approach a vertical, straight line relation to each other resembling the opening of a set of jaws. The jack includes a self-contained power source, drive means, and control apparatus as well as an apparatus for lifting the rear end of the jack for alignment purposes, a handle, and wheels for convenience in transporting the jack.
REFERENCES:
patent: 2687873 (1954-08-01), Travtman et al.
patent: 3378231 (1968-04-01), Rapp
patent: 3819153 (1974-06-01), Hurst et al.
patent: 3907252 (1975-09-01), Gaarder
Jones Jr. James L.
Reilly John E.
Watson Robert C.
Young James R.
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