Jacking apparatus having a fast repositioning stroke

Details Jacking apparatus having a fast repositioning stroke Jacking apparatus having a fast repositioning stroke

1981-12-17

1985-03-26

Schmidt, Frederick R.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

91519, B66F 108

Patent

active

045068674

ABSTRACT:
A jacking apparatus and method for effecting movement of loads. At least two double-acting hydraulic cylinders including a first and a second cylinder arranged in tandem provide increased force for a power stroke of the apparatus. Hydraulic fluid pressure is provided at a predetermined flow rate to the group of hydraulic cylinders. Substantially all of the predetermined flow rate of hydraulic fluid is routed to the first hydraulic cylinder to provide increased speed for a repositioning stroke of the apparatus.

REFERENCES:
patent: 2517164 (1950-08-01), Arps
patent: 2962001 (1960-11-01), Morton et al.
patent: 3170379 (1965-02-01), Dempster
patent: 3680713 (1972-08-01), Langley
patent: 4007915 (1977-02-01), Chambers
patent: 4024794 (1977-05-01), Grubb
patent: 4030699 (1977-06-01), Heimke
patent: 4296677 (1981-10-01), Little et al.

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