Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1988-01-14
1989-05-30
Sikes, William L.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254133R, 254DIG1, 254DIG3, B66F 324
Patent
active
048343390
ABSTRACT:
A hydraulic jack system used for lifting and lowering heavy loads such as machine tools comprises a lower cylindrical member, a solid ram member mounted within the cylindrical member and an outer sleeve member having affixed thereto a lifting slab and fitting over the lower cylindrical member. A hydraulic injection hose forces fluid into the lower cylindrical tube causing the ram member to rise and thus lift the outer sleeve member and the flange on which the load rests. The hydraulic injection hose has an adjustable valve which allows not only for injecting fluid at a rate to raise the ram member and thus the load as quickly as desired, but also allows fluid to flow back through the fluid injection hose at a desired rate such as to lower the load through the force of gravity as quickly as desired. Also affixed to the base of the system are a pair of handles which function to allow the jack to be carried about and also prevent rotation of the outer sleeve member such that a notch in it sits over the fluid injection hose.
REFERENCES:
patent: 1590830 (1926-06-01), Jewkes
patent: 3806091 (1974-04-01), Wride
patent: 4194726 (1980-03-01), Hance
patent: 4262881 (1981-04-01), Gray
patent: 4641815 (1987-02-01), Yu
Holloway B. R. R.
Sikes William L.
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