Mechanical jack

Details Mechanical jack Mechanical jack

1991-09-24

1992-07-21

Hartman, J. J.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Screw

254 7B, 254122, 254126, B60P 110

Patent

active

051316285

ABSTRACT:
A mechanical jack comprising a base with wheels attached thereon for moving the jack, a primary arm of which an end is pivoted on the base so as to be rotatable with respect to the base, a secondary arm of which an end is pivotally mounted approximately on the middle of the primary arm so as to be rotatable with respect to the primary arm, and a threaded rod threadingly connecting between the free ends of the primary and secondary arms so that when the threaded rod is rotated, the free ends of the primary and secondary arms move towards or away from each other, depending upon the rotation direction of the threaded rod. With the pivoted ends as the rotation centers, moving the free ends of the arms will also heighten the free end of the secondary arm so as to lift a vehicle supported thereon.

REFERENCES:
patent: 3290008 (1966-12-01), White
patent: 3347523 (1967-10-01), Hankey et al.
patent: 3870278 (1975-03-01), Lee
patent: 5029814 (1991-07-01), Liesel et al.

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