Implements or apparatus for applying pushing or pulling force – Single throw lever – Mechanically actuated
Patent
1997-08-04
1999-06-29
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Mechanically actuated
269 71, 269287, B66F 300
Patent
active
059156716
ABSTRACT:
A wall jack apparatus includes a base assembly which includes a central arm support portion. A telescopic lift arm assembly includes a proximal lift arm end which is pivotally connected to the arm support portion at a relatively low first connection position. A telescopic push arm assembly includes a proximal push arm end which is pivotally connected to the arm support portion at a relatively high second connection position. The distal lift arm end of the telescopic lift arm assembly is pivotally connected to a pivoting portion of the telescopic push arm assembly between the proximal push arm end and the distal push arm end. A clamping assembly is pivotally connected to the distal push arm end. The base assembly further includes a plurality of legs is connected to the arm support portion. A plurality of feet are connected to the legs. The legs project laterally from the arm support portion of the base assembly, and the feet are located substantially horizontally with respect to the arm support portion of the base assembly. The distal push arm end includes a hinge assembly. The clamping assembly includes a first jaw member which includes first hinge pin receivers connected to the hinge assembly. A second jaw member includes second hinge pin receivers connected to the hinge assembly. Jaw locking means are connected to the first and second jaw members for locking the first and second jaw members together.
REFERENCES:
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patent: 4531720 (1985-07-01), Soder
patent: 4650389 (1987-03-01), Mulqueen
patent: 4810151 (1989-03-01), Shem
patent: 5118247 (1992-06-01), Royden
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