Mobile lifting jack

Details Mobile lifting jack Mobile lifting jack

1987-03-03

1988-07-12

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66F 300

Patent

active

047565098

ABSTRACT:
A mobile jack, particularly for use in installation of support beams in urground mines, is disclosed. The jack comprises a wheel-mounted frame and a hydraulic lifting arm having a jack head which is horizontally rotatable 360.degree.. The lifting arm is also longitudinally positionable along the length of the mobile jack. The lifting arm is manually raised and lowered by pumping a lever connected to a hydraulic jack cylinder.

REFERENCES:
patent: 942170 (1909-12-01), Dunlap
patent: 1635617 (1927-07-01), Hall
patent: 1887924 (1932-11-01), Evans
patent: 2580743 (1952-01-01), Eckels
patent: 3588046 (1971-06-01), Weaver
patent: 4089426 (1978-05-01), Sheppard
patent: 4427178 (1984-01-01), Kozlowski
patent: 4640495 (1987-02-01), Parsons

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