Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1985-10-25
1987-09-22
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254133R, 405132, B66F 324
Patent
active
046950354
ABSTRACT:
A jack for installing in a mine a plurality of elongate extensible panels adapted to extend vertically in side-by-side relation from the floor to the roof of a passageway in a mine. Each panel comprises a first elongate member consituting a lower member of the panel and a second elongate member constituting an upper member of the panel, each member having a web and flanges at opposite sides of the web, one of the members having a telescoping sliding fit in the other. The upper member of each panel has a head at its upper end and the lower member of each panel has a foot at its lower end. The jack comprises a base adapted to fit between the flanges of a lower panel member and engage the foot of the lower panel member, an extensible member having a crosshead at its upper end adapted to fit between the flanges of an upper panel member and engage the head of the upper panel member, a guide extending up from the base guiding the extensible member for up and down movement relative to the guide and the base, a hydraulic jack cylinder extending up from the base coaxially with the guide having a lift member movable up and down for raising and lowering the extensible member, a hydraulic pump on the base for pumping hydraulic fluid to the cylinder for moving the lift member and the extensible member upwardly, and a mechanism for operating the pump comprising a handle pivoted on the guide at a level convenient for an operator and a link from the handle to the pump.
REFERENCES:
patent: 2691503 (1954-10-01), Bigelow
patent: 2721051 (1955-10-01), Lobbe
patent: 2917953 (1959-12-01), Badali
patent: 3087626 (1963-04-01), Kimball
patent: 4483642 (1984-11-01), Kennedy et al.
Kennedy John M.
Kennedy William R.
Schad Steven P.
Schmidt Frederick R.
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