Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1982-06-25
1984-12-04
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...
91170MP, 91453, 91518, F15B 908
Patent
active
044857241
ABSTRACT:
Hydraulic control apparatus serves to operate roof support props of a mineral mining installation. An automatic setting arrangement with a valve device ensures the props become set against the roof with a high uniform force by connecting a prop pressure chamber to a pressure fluid source once a threshold pressure is exceeded signifying the prop has been extended. To disable the automatic setting arrangement during prop retraction the valve device thereof is provided with a control piston which is subjected to pressure during retraction to oppose the action of another control piston which responds to the threshold pressure.
REFERENCES:
patent: 4076210 (1978-02-01), Spielvogel
patent: 4391181 (1983-07-01), Weirich et al.
Demircan Bayramadi
Kussel Willy
Garrett Robert E.
Gewerkschaft Eisenhutte Westfalia
Husar John M.
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