Tensionable cable bolt with mixing assembly
AssigneeJennmar Corporation
InventorsFrank Calandra, Jr., John C. Stankus, James J. Scott, deceased, Brian R. Castle, John G. Oldsen, Kendal L. Taylor, Paul Yacisin
Life of this patent
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Abstract
A tensionable mine roof cable bolt having a resin grouted upper portion and a mechanically anchored lower portion. The lower portion includes a shaft which is swaged to the cable and accepts a mechanical anchor. The cable bolt is rotated during installation in a mine roof to mix resin and simultaneously engage the mechanical anchor with the rock. A drivehead attached to the lower end of the cable fails upon tensioning of the bolt to a predetermined load.
Claims18
A tensionable cable mine roof bolt comprising:
- a multi-strand cable having a first end, a second end and a mixing portion positioned between said first and second ends;
- a barrel and wedge assembly attached to said cable between said first end and said mixing portion and adapted to support a bearing plate;
- a drivehead attached to said cable first end;
- an externally threaded shaft surrounding and attached to said cable between said barrel and wedge assembly and said mixing portion;
- and
- a mechanical anchor threaded onto an end of said shaft distal from said barrel and wedge assembly.
A tensionable cable mine roof bolt for insertion into a bore hole in rock and adapted to be resin grouted, said bolt comprising:
- a bearing plate;
- a barrel and wedge assembly supporting said bearing plate;
- a multi-strand cable having a first end attached to said barrel and wedge assembly and having a resin mixing portion positioned on said cable distal from said first end;
- a drivehead releasably mounted on said first end opposite said barrel and wedge assembly from said bearing plate;
- an externally threaded shaft mounted on said cable between said bearing plate and said resin mixing assembly;
- and
- a mechanical anchor threaded onto said shaft, wherein when said bolt is rotated within the bore hole to mix the resin, said mechanical anchor engages the rock and tensions said bolt.
A tensionable cable mine roof bolt as claimed in claim 17 wherein said mixing portion further comprises a pair of said sleeve members wherein each said baffle mounted on each said sleeve member is adapted to change a direction of resin flowing past said baffles.
Dependencies are inferred from the claim text.