Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Activation of one path disables second path
Patent
1977-12-02
1979-07-03
Schwadron, Martin P.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Activation of one path disables second path
91170MP, 91427, 91460, 91461, 91527, 405302, F15B 1304, F15B 1100
Patent
active
041596714
ABSTRACT:
A self-advancing mine roof support is provided, in addition to the normal manually operable control valve means for controlling raising and lowering of the roof-engaging structure of the support and operation of the advancing means, with an automatic sequence control valve means operable in response to a control signal from a position removed from the support, for example from an adjacent support, and an isolating valve means arranged so that control of the various operations can be effected either by means of the manually operable means or from the safety of a location spaced away from the support being controlled by means of the automatic valve means each independently of the other.
REFERENCES:
patent: 2146030 (1939-02-01), Schjolin
patent: 3306050 (1967-02-01), Andrews
patent: 3320001 (1967-05-01), Allen
patent: 3541926 (1970-11-01), Grebe
patent: 3821880 (1974-07-01), Weirich
patent: 3906738 (1975-09-01), Weirich
Hershkovitz Abraham
Schwadron Martin P.
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