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
1985-10-01
Miscellaneous
No indication
English