US 12,140,031 B2
Deformed hollow rock bolt
Brendan Robert Crompton, Johannesburg (ZA); Rual Abreu, Johannesburg (ZA); Greig Knox, Johannesburg (ZA); and Paolo Ettore Pastorino, Johannesburg (ZA)
Assigned to INNOVATIVE MINING PRODUCTS (PTY) LTD, Johannesburg (ZA)
Appl. No. 17/784,028
Filed by INNOVATIVE MINING PRODUCTS (PTY) LTD, Johannesburg (ZA)
PCT Filed Dec. 9, 2020, PCT No. PCT/ZA2020/050069
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/119679, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019/08131 (ZA), filed on Dec. 9, 2019; and application No. 2020/02462 (ZA), filed on May 6, 2020.
Prior Publication US 2023/0009400 A1, Jan. 12, 2023
Int. Cl. E21D 21/00 (2006.01); E21D 20/02 (2006.01)
CPC E21D 21/0026 (2013.01) [E21D 20/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A self-drilling resin anchored rock bolt which includes an elongate body of a metal material which extends between a distal end and a proximal end, a threaded portion at the proximal end, a resin bore which extends through the elongate body, opening at each of the ends, a first integral anchor on the body, comprised of a plurality of integrally formed paddle formations, and a drill bit engaged to the distal end that has a resin conduit which communicates an exterior of the drill bit with the resin bore, wherein the threaded portion has a first section, with a first thread density, extending from the proximal end, and a second section, with a second thread density, starting at the end of the first section and extending towards the distal end; and wherein the first thread density is lower than the second thread density.