Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1982-04-12
1984-05-22
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405291, E21D 17054
Patent
active
044498608
ABSTRACT:
A mine roof support has a main roof bar which is pivotably connected to an auxiliary forwardly-extendible bar. At least one piston and cylinder unit serves to swing the auxiliary bar about the main bar to bring the auxiliary bar into a roof-contacting position aligned with the main bar or into a stowed position beneath the main bar or into some intermediate position. One or more pivotable guide levers connect the auxiliary bar to the piston and cylinder unit. A guide member is also connected to the unit and slidably locates in longitudinal guideways formed in ribs or the like at the underside of the main roof bar.
REFERENCES:
patent: 4266892 (1981-05-01), Maykemper
patent: 4347021 (1982-08-01), Elsner et al.
Becker Kunibert
Elsner Burckhard
Kirchbrucher Rudiger
Corbin David H.
Gewerkschaft Eisenhutte Westfalia
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