A resin anchored rock bolt with a locating formation at a leading end

Abstract

Disclosed is a centralising positioner for a resin bolt which includes a central attachment part which is adapted to engage a leading end of the bolt and a positioning part integral with the attachment part that extends from the attachment part.

1 . A centralising positioner for a resin bolt which includes a central attachment part which is adapted to engage a leading end of the bolt and a positioning part integral with the attachment part that laterally extends from the attachment part. 
     
     
         2 . A centralising positioner according to  claim 1  wherein the positioning part is a circumscribing umbrella formation which extends from a perimeter of the attachment part. 
     
     
         3 . A centralising positioner according to  claim 2  wherein the umbrella formation is biased in an open or flared position and is resiliently moveable from the open position to a closed or folded position. 
     
     
         4 . A centralising positioner according to  claim 2  wherein the umbrella formation is made of a sheet material which perforated with a plurality of resin flow-through holes. 
     
     
         5 . A centralising positioner according to  claim 1  wherein the positioning part is comprised of a plurality of locating fingers integral with and projecting from a perimeter of the attachment part. 
     
     
         6 . A centralising positioner according to  claim 5  wherein the locating fingers are evenly radially spaced about the perimeter and each have equal lateral reach. 
     
     
         7 . A centralising positioner according to  claim 5  wherein the positioner has three or four locating fingers. 
     
     
         8 . A centralising positioner according to  claim 5  wherein the fingers extend in a first direction which is aslant to a plane of the attachment part. 
     
     
         9 . A centralising positioner according to  claim 8  which has a penetrating formation upstanding from the plane of the attachment part in a second direction which is opposed to the first direction. 
     
     
         10 . A centralising positioner according to  claim 9  wherein the penetrating formation is comprised of a radial grouping of triangular or orthogonal sections bent away from the plane of the central attachment. 
     
     
         11 . A centralising positioner according to  claim 1  wherein the attachment part has a central aperture for receiving a peaked formation on a leading end of the bolt. 
     
     
         12 . A resin anchored rock bolt which has an elongate metal body which extends between a leading end and a trailing end and at least one centralising positioner according to  claim 1 . 
     
     
         13 . A resin bolt according to  claim 12  wherein the positioner has a penetrating formation upstanding from the plane of the attachment part. 
     
     
         14 . A resin bolt according to  claim 13  wherein the penetrating formation is comprised of a radial grouping of triangular or orthogonal sections bent away from the plane of the central attachment. 
     
     
         15 . A resin bolt according to  claim 12  wherein the leading end of the rock bolt is conically shaped and the attachment part has a central aperture for receiving the conically shaped leading end. 
     
     
         16 . A centralising positioner according to  claim 3 , wherein the umbrella formation is made of a sheet material which perforated with a plurality of resin flow-through holes. 
     
     
         17 . A centralising positioner according to  claim 6 , wherein the positioner has three or four locating fingers. 
     
     
         18 . A centralising positioner according to  claim 6 , wherein the fingers extend in a first direction which is aslant to a plane of the attachment part. 
     
     
         19 . A centralising positioner according to  claim 7 , wherein the fingers extend in a first direction which is aslant to a plane of the attachment part. 
     
     
         20 . A centralising positioner according to  claim 2 , wherein the attachment part has a central aperture for receiving a peaked formation on a leading end of the bolt.