Back to results
US 6,270,290 B1Granted
Tensionable cable bolt
AssigneeJennmar Corporation
InventorsJohn C. Stankus, Kendal L. Taylor
Life of this patent
Estimating the term…
Abstract
A tensionable mine roof cable bolt having a resin grouted upper portion and a mechanical anchor. The cable bolt is rotated during installation in a mine roof bore hole to mix resin and engage the mechanical anchor with the rock. A drivehead press fitted onto the lower end of the cable may be stripped off the bolt upon tensioning of the bolt to a predetermined load.
Claims20
A tensionable cable mine roof bolt comprising:
- an elongated member including (i) a length of multi-strand cable having an upper mixing portion adapted to be resin grouted in a bore hole in rock, and (ii) an end portion having a bolt head drivable by mine roof installation equipment;
- and
- a mechanical anchor mounted on said cable at a position below and proximal to said mixing portion, whereby when resin is inserted into the bore hole and said bolt is rotated, said mechanical anchor engages with the rock thereby tensioning said bolt and said upper mixing portion simultaneously mixes the resin.
A tensionable cable mine roof bolt comprising:
- an elongated member including (i) a length of multi-strand cable having a distal end and an upper portion adapted to be resin grouted in a bore hole in rock, ii) an end portion having a bolt head drivable by mine roof installation equipment, and (iii) an externally threaded sleeve attached to and surrounding said cable distal end;
- and
- a mechanical anchor threaded onto said sleeve, whereby when resin is inserted into the bore hole and said bolt is rotated, said mechanical anchor engages with the rock thereby tensioning said bolt and said upper portion mixes the resin.
Dependencies are inferred from the claim text.