Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1983-12-09
1985-12-17
Garrett, Robert E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
91 6, 91518, 91523, 91531, 60486, F15B 1105
Patent
active
045586292
ABSTRACT:
Pipe thrust-jacking apparatus includes a pressure ring 5 which is advanceable by a plurality of hydraulic rams 3. The rams are controlled by hydraulic control means having a plurality of hydraulic control valves 19. Each control valve is associated with a respective hydraulic ram, and is connected to a first input line and to a second input line. Each of the first input lines is connected to a respective hydraulic fluid feed line 9, and each of the second input lines 17 is connected to a common hydraulic fluid supply line 11 and to an auxiliary pump P2. The common supply line is connected to all of the feed lines. Means 12,15 are provided for selectively connecting each of the hydraulic control valves to its first input line and/or its second input line.
REFERENCES:
patent: 4046060 (1977-09-01), Becker et al.
patent: 4142445 (1979-03-01), Lohbauer
patent: 4210061 (1980-07-01), Bianchetta
patent: 4439063 (1984-03-01), Heitkamp
Heitkamp Herbert
Unger Eberhart
Garrett Robert E.
Gewerkschaft Eisenhutte Westfalia
Meyer Richard S.
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