Search International and National Patent Collections

1. (WO2018223157) ROCK BOLT WITH RELEASEABLY FIXABLE BUNG

Pub. No.:    WO/2018/223157    International Application No.:    PCT/ZA2018/050028
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 31 01:59:59 CEST 2018
IPC: E21D 20/02
E21D 21/00
Applicants: NCM INNOVATIONS (PTY) LTD
Inventors: CROMPTON, Brendan Robert
Title: ROCK BOLT WITH RELEASEABLY FIXABLE BUNG
Abstract:
The invention provides a bung (10) which has a body (12) which extends between a leading end (24) and a trailing end (22) and which includes an inner part (14) of a rigid material which has a cylindrical aperture (20) for receiving a rock bolt (34) and an outer sealing part (16) of a resiliently deformable material circumscribing the inner part, wherein the inner part and the outer part engage at an interface which has a co-efficient of friction which allows the outer part to disengage from the inner part at the interface when a shear force above a predetermined level is applied to the outer part or the inner part.