Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1981-07-20
1985-01-22
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60428, 60429, 60444, 60461, 60476, 60484, 60486, 166 77, 254106, F15B 13042, F15B 1306, F16H 3946, E21B 1908
Patent
active
044943768
ABSTRACT:
A jacking mechanism for jacking a well casing or other well pipe vertically, and including a hydraulic control system in which a reversible variable displacement pump acts in one condition to deliver pressure fluid in parallel with another pump to the lower end of a jacking cylinder to actuate the piston thereof upwardly, with fluid discharging from the upper end of the cylinder to the variable displacement pump and being metered therethrough to regulate the rate of upward movement of the piston. In a second condition of the apparatus, flow through the variable displacement pump is reversed to lower the piston, and a variable restriction valve regulates discharge of fluid from the lower end of the cylinder to act with the variable displacement pump in regulating downward movement of the piston and supported pipe. In a third condition of the apparatus, the variable displacement pump discharges fluid to the lower end of the cylinder in a relation exerting an upward force of increased power on the piston and suspended pipe.
REFERENCES:
patent: 2309983 (1943-02-01), Riddle
patent: 3096075 (1963-07-01), Brown
patent: 3788773 (1974-01-01), Van der Kolk
patent: 3901032 (1975-08-01), Steiger et al.
patent: 3999610 (1976-12-01), Sage et al.
patent: 4359130 (1982-11-01), Kirkham
Cohen Irwin C.
Green William P.
Varco International, Inc.
LandOfFree
Fluid actuated jack mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid actuated jack mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid actuated jack mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-560542