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US 12,497,891 B2Granted
Rock bolt
AssigneeSandvik Mining and Construction Australia (Production/Supply) Pty Ltd
InventorsMietek Rataj, Bradley Darlington
Life of this patent
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Abstract
A rock bolt includes a central rod, a tubular outer body provided around the central rod, and an expansion mechanism arranged for radially expanding the leading portion of the outer body. The rock bolt is arranged such that the outer body at installation is pulled into a bore of a formation from the leading portion of the outer body using a driving force applied via the central rod.
Claims16
A rock bolt comprising:
- a central rod with a threaded leading portion and a trailing portion;
- a tubular outer body provided around the central rod along at least a portion of a length of the central rod, said tubular outer body having a leading portion and a trailing portion;
- a first wedge means attached to the leading portion of the central rod;
- and
- a second wedge means attached to the leading portion of the outer body between the first wedge means and the trailing portion of the outer body, wherein the first wedge means and the second wedge means are configured such that the first wedge means is arranged to force the second wedge means radially outwards about a longitudinal axis of the rock bolt upon movement of the first wedge means in a direction towards the trailing portion of the central rod to thereby radially expand the outer body, wherein the leading portion of the outer body is provided with one or more ledge means, and wherein the central rod is provided with a drive means configured to drive the ledge means upon movement of the drive means in a driving direction of the rock bolt to thereby force the outer body in the driving direction via the ledge means.
2 more elements
Dependencies are inferred from the claim text.