Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1987-02-24
1989-01-31
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254386, B66F 324
Patent
active
048011266
ABSTRACT:
A three-chamber jack employs a telescoping relation between an outer cylinder and an intermediate cylinder, the closed outer ends of which cylinders continuously sustain lifting-load force. An annular piston is fixed to the inner end of the intermediate cylinder and has sealed sliding engagement to the bore of the outer cylinder. An inner cylinder is fixed to the closed outer and of the outer cylinder and extends concentrically within both the outer and the intermediate cylinder, and the inner cylinder has sealed sliding engagement with the bore of the annular piston. Three internal volumes are thus defined. Load-counterbalancing gas pressure is continuously operative within the first of those volumes, over the entire area of the annular piston, and hydraulic fluid contained within the second and third volumes is reversibly pumped from one to the other of the second and third volumes, to reversibly determine piston displacement.
REFERENCES:
patent: 2897907 (1959-08-01), Blount et al.
patent: 2994202 (1961-08-01), Knapp et al.
patent: 4715180 (1987-12-01), Rosman
Dynamic Hydraulic Systems, Inc.
Hartman Judy J.
Schmidt Frederick R.
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