Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1982-10-15
1984-10-02
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405292, 405302, E21D 1544
Patent
active
044745109
ABSTRACT:
The support assembly is made up of a floor-standing runner member 1, a hydraulically vertically-adjustable prop 2 mounted on the same, a roof canopy 3 supported by the same and a rockfall shield 4 hinged to the same on the backfill side which is guided to be pivotable in a vertical plane by two direction-control members 5 and 6 articulated to the runner member so as to be spaced apart one behind the other. The front direction-control member 6 is constructed as a hydraulic thrust piston mechanism. Via a control circuit 8 the hydraulic control valve 7 of the direction-control member 6 is connected to measuring devices 9 usable to measure the position of at least two mutually variably spaced apart support assembly reference points. If the reference points deviate from the preset normal position of the support assembly, pressure fluid acts on the front direction-control member 6 via the control circuit 8 until the normal position has been regained.
REFERENCES:
patent: 3436922 (1969-04-01), Irresberger et al.
patent: 3478522 (1969-11-01), Rieschel
patent: 3800545 (1974-04-01), Groetschel
patent: 4155675 (1979-05-01), Friedrichs
patent: 4222686 (1980-09-01), Bell et al.
Corbin David H.
Hermann Hemscheidt Maschinenfabrik GmbH & Co.
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