Method employs curved shield on each side of mining machine. In stowed position, shield folded against roof-support columns on one side. In deployed position, shield raised and braced against coal-seam wall by hydraulic cylinder. Shield supports wall until roof and wall properly secured by bolting and cement coating.
Side Shield for Wall Support
NASA Tech Briefs ; 9 , 2
01.10.1985
Sonstige
Keine Angabe
Englisch