Implements or apparatus for applying pushing or pulling force – Single throw lever – Special engaging feature
Patent
1977-09-26
1981-04-14
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Special engaging feature
B66F 300
Patent
active
042615488
ABSTRACT:
A hydraulic jack provided for raising, leveling, and moving steel reinforced concrete. A hole is drilled vertically in the concrete to be lifted, and two wedges, a tapered and a straight wedge are lowered into the aperture in vertical contact. The tapered wedge is lowered into the hole first to protrude under the perifery of the round aperture and the straight wedge run down on the face opposite to the wedge.
REFERENCES:
patent: 235877 (1880-12-01), Jones
patent: 543017 (1895-07-01), Henderson et al.
patent: 2830789 (1958-04-01), MacMillan
patent: 3957247 (1976-05-01), Haller et al.
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