Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1978-03-17
1983-09-20
Schwadron, Martin P.
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91409, 92110, 248354H, F15B 1522
Patent
active
044048939
ABSTRACT:
A hydraulic mine prop includes an inner piston-like prop guided within an outer cylinder-like prop, and a roof fall valve. The interior space of said inner prop communicates freely with the working chamber of the prop, and the roof fall valve is arranged outwardly on the prop and rigidly secured thereon, the valve being connected to the working chamber by an orifice provided in the prop and leading to the working chamber. The cross-sectional area of the roof fall valve in its open position.
REFERENCES:
patent: 2139185 (1938-12-01), Engel
patent: 3138066 (1964-06-01), Walker
patent: 3147671 (1964-09-01), Geyer
patent: 3249018 (1966-05-01), Ellis, Jr.
patent: 3559538 (1971-02-01), Holder
Siebenhofer Gottfried
Sigott Siegfried
Suessenbeck Heinrich
Zitz Alfred
Klein Richard L.
Schwadron Martin P.
Vereinigte Osterreichische Eisen- und Stahlwerke - Alpine Montan
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