Rock bolt with information display region

Patent metadata

Field	Value
Publication number	US-11428102-B2
Application number	US-201917270116-A
Country	US
Kind code	B2
Filing date	Aug 20, 2019
Priority date	Aug 23, 2018
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A rock bolt arranged for installation within a bore formed in rock strata includes an elongate shaft with the leading end for installation into the bore and a trailing end projecting from an open end of the bore. A locking nut is threadably attached to the trailing end and is arranged to display product information and the like at a display face. The display face is recessed axially into the nut to provide protection against damage to the display face that may otherwise render the information unreadable.

First claim

The invention claimed is:

1. A rock bolt arranged for installation within a bore formed in rock strata, the rock bolt comprising:
an elongate shaft having a leading end for installation into the bore and a threaded trailing end arranged to project from an open end of the bore;
an internally threaded nut attached at the trailing end arranged to mount a rock plate against a surface of the rock strata, the nut having an axially forward facing contact face arranged for positioning opposed to the rock plate and an axially rearward facing exposed face;
a recessed portion extending axially inward from the exposed face and defining an axially rearward facing display face being axially recessed relative to the exposed face; and
a tab mounted within the recessed portion and having an axially rearward facing tab display face.

2. The rock bolt as claimed in claim 1 , wherein the nut is a blind or semi-blind nut.

3. The rock bolt as claimed in claim 1 , wherein the exposed fac is annular and the display face is positioned centrally and surrounded by the exposed face.

4. The rock bolt as claimed in claim 3 , wherein the nut is semi-blind and the display face is annular and extends around a central opening into an internal threaded cavity of the nut.

5. The rock bolt as claimed in claim 1 , wherein the recessed portion includes an undercut such that a diameter of the recess portion increases in an axial direction from the exposed face.

6. The rock bolt as claimed in claim 5 , wherein the tab includes an axially rearward facing tab display face, wherein the tab is secured within the recessed portion by abutment underneath the undercut.

7. The rock bolt as claimed in claim 1 , wherein the tab has an axial thickness less than an axial depth of the recessed portion.

8. The rock bolt as claimed in claim 1 , wherein the tab is secured within the recessed portion by an adhesive, crimping, weld or at least one radial projection extending radially to overlay at least a portion of the tab.

9. The rock bolt as claimed in claim 1 , wherein a distance by which the display face is recessed axially relative to the exposed face is less than a radial wall thickness of the nut.

10. The rock bolt as claimed in claim 9 , wherein the distance by which the display face is recessed axially relative to the exposed face is less than half a radial wall thickness of the nut.

11. The rock bolt as claimed in claim 1 , comprising a resin, cement grouted or mechanical friction bolt.

12. The rock bolt as claimed in claim 1 , further comprising indicia provided on the display face.

Assignees

• Sandvik Mining And Construction Australia Production/Supply Pty Ltd
• Sandvik Mining And Construction Tools Ab
• Sandvik Minina and Construction Tools AB

Inventors

• Rataj Mieczyslaw
• Weaver Steven
• Darlington Bradley
• Young Peter
• Roach Warren

Classifications

• E21D21/0093

  Accessories · CPC title

• E21D21/00 Primary

  Anchoring-bolts for roof, floor {in galleries or longwall working}, or shaft-lining protection ({ground anchors E02D5/80; anchorings for building constructions E04B1/41, E21D21/00}; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose F16B13/00 {; bolts with visible load G01L1/00}) · CPC title

• E21D21/0026 Primary

  characterised by constructional features of the bolts · CPC title

• F16B13/10 Primary

  with separate gripping parts moved into their final position in relation to the body of the device by a separate operation (F16B13/06 takes precedence) · CPC title