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Drill Bit for Use with a Friction Bolt

Inactive Publication Date: 2018-01-04
FERO GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a drill bit that can be easily attached to a friction bolt, as well as a drill bit assembly and a friction bolt that can be easily connected together. This allows for easy assembly and disassembly of drill bit and drive member. The invention also provides a drilling system and a method for inserting a friction bolt into a formation. The technical effect of the invention is to simplify the process of drilling and to improve the efficiency of drilling operations.

Problems solved by technology

This two step process, whilst allowing for the recovery of the entire drill string used to drill the hole, is time consuming and otherwise inefficient.
The loss of the drill bit with each friction bolt comes at a cost and also requires a new drill bit to be fitted before the next friction bolt can be installed.

Method used

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  • Drill Bit for Use with a Friction Bolt
  • Drill Bit for Use with a Friction Bolt
  • Drill Bit for Use with a Friction Bolt

Examples

Experimental program
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second embodiment

[0138]FIGS. 5A-5C depict a drill bit according to the first aspect of the present invention, generally indicated by the numeral 110. The drill bit 110 is generally ring shaped and defines a leading end (best depicted in FIG. 5B) that defines a cutting part comprising three raised, evenly spaced buttons formed of tungsten carbide 112a, 112b and 112c, a following end and a socket 114 that extends between the leading and following ends so that each end defines an aperture therein.

first embodiment

[0139]As with the drill bit in FIGS. 1A-1F, the main body of the drill bit 110 is formed of a suitable metal such as a 4140 grade metal. The drill bit 110 is designed to be readily disposable after a single pass drilling to install a friction bolt. As the intention is for the drill bit 10 to be disposed of in the drill hole it is sized and shaped so as to not pass through the longitudinal axial passage in the friction bolt once installed.

[0140]The socket 114 has a blunt reuleaux triangular shaped cross section and is adapted to receive a drive member in the form of a drive means in the form of a second drill bit 140 (discussed in further detail below).

[0141]The outer cross sectional shape of the drill bit 110 is generally circular and the outer surface of the drill bit 110 includes three major cut outs 116a, 116b 116c and three channels 118a, 118b (not shown) and 118c that are evenly spaced and extend around the outer surface between each cut out 116a, 116b and 116c. The channels 1...

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Abstract

A drill bit for a drill assembly including a friction bolt defining a longitudinal axial passage, the drill bit being adapted to be releasibly attached to the friction bolt and comprising: (i) a leading end including a cutting part; (ii) a following end; and (iii) an outer surface defining a friction bolt engaging means adapted to releasibly engage with the leading end of the friction bolt.

Description

FIELD OF THE INVENTION[0001]The present invention relates to drilling tools and assemblies for installing friction bolts and more particularly drill bits for drill tools and assemblies for installing friction bolts. The present invention also relates to friction bolts and methods of drilling involving friction bolts.BACKGROUND OF THE INVENTION[0002]Friction bolts are used to stabilise rooves and walls during underground mining and most often have a generally cylindrical body, a collar at the trailing end of the body and a tapered leading end portion of the body that assists in inserting the friction bolt into a bore hole.[0003]Friction bolts often include a split down one side so that when they are driven into a slightly undersized hole in the rock strata, the rock bolt resiliently deforms to reduce the size of the split in the body. This resilient deformation exerts radial and frictional forces against the wall of the hole to retain the friction bolt within the hole and to reinforc...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21B10/64
CPCE21D21/0053E21B10/64E21D21/004E21D21/0046E21B10/62
Inventor MCLAREN, MATTHEW DAVID
Owner FERO GROUP
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