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US 4,289,427 AGranted
Process for installing roof bolts
AssigneeOwens-Corning Fiberglas Corporation
InventorJohn A. Rolston
Life of this patent
Estimating the term…
Abstract
A process for supporting the roof of a mine shaft includes drilling a hole into the roof and then inserting a multi-stranded cable into the hole. The cable has a duct therein to allow the exit of air during its insertion. During the insertion, the cable is rotated and a bonding agent is introduced into the annulus between it and the surface of the hole.
Claims10
A process comprising:
- inserting a cable into a hole in a surface of a mine shaft, said cable comprising a plurality of twisted strands wherein a plurality of said strands each have a duct extending from one end of the strand to the other to permit air to escape from the hole;
- sealing the entrance of said hole around said cable;
- rotating the cable in the direction to tighten the cable during its insertion into said hole and;
- simultaneously with the insertion of said cable, injecting a bonding agent into said hole around said cable.
1 more element
Dependencies are inferred from the claim text.