Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1980-05-08
1982-08-31
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405291, E21D 17054
Patent
active
043470211
ABSTRACT:
A mine roof support has a main roof bar which is pivotably connected to an auxiliary forwardly-extendible bar. A 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. Pivotable guide members connect between the main and auxiliary bars respectively and a pivot joint linked to the piston and cylinder unit. The guide members can take the form of simple straps or levers but an additional piston and cylinder unit can also be used as one of the guide members.
REFERENCES:
patent: 3848928 (1974-11-01), Nakajima
Elsner Burckhardt
Kirchbrucher Rudiger
Corbin David H.
Gewerkschaft Eisenhutte Westfalia
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