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US 2012/0070234 A1Published application
Rock Bolt
AssigneeFCI Holdings Delaware, Inc.
InventorPeter Harold Craig
Life of this patent
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Abstract
The present invention relates to rock bolts which may be used in mining applications. The rock bolt of this invention includes a mechanical anchoring arrangement to facilitate retaining the rock bolt in a borehole, and also a drill bit to enable self drilling of the rock bolt. Rotation of the rock bolt about an axis of the rock bolt in a first direction causes the drill bit to drill into rock and to create a borehole to receive the rock bolt. Subsequently, rotation in the opposite direction actuates a mechanical anchoring arrangement to anchor rock bolt.
Claims8
A self drilling rock bolt comprising:
- an elongated hollow shank having a threaded portion at a head end;
- a mechanical anchoring arrangement including an expansion assembly having an expansion shell and a cooperating chuck threaded to the threaded portion of the hollow shank, the chuck having an extension portion having a central hole into which the threaded portion of the hollow shank is received;
- and
- a drill bit coupled to a periphery of the extension portion of the chuck, the drill bit positioned radially outward from the central hole of the extension portion,
- wherein the chuck is arranged to rotate together with the expansion shell whereby rotation of the rock bolt in one direction provides a drilling action with the expansion shell rotating together with the hollow shank whereas rotation of said bolt in an opposite direction provides axial movement of the chuck relative to the hollow shank and the expansion shell to mechanically secure the rock bolt.
2 more elements
Dependencies are inferred from the claim text.