US 11,988,094 B2
Drilling assembly for inserting a rock bolt
Clarissa Elizabeth McLaren, Western Australia (AU)
Appl. No. 17/759,191
Filed by HARDROCK MINING SOLUTIONS PTY LTD, Western Australia (AU)
PCT Filed Jan. 28, 2021, PCT No. PCT/AU2021/050051
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/151150, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020900236 (AU), filed on Jan. 29, 2020.
Prior Publication US 2023/0074816 A1, Mar. 9, 2023
Int. Cl. E21D 21/00 (2006.01); E21B 10/42 (2006.01); E21B 17/042 (2006.01); E21B 17/046 (2006.01)
CPC E21D 21/004 (2013.01) [E21B 10/42 (2013.01); E21B 17/042 (2013.01); E21B 17/046 (2013.01); E21D 21/0033 (2013.01)] 22 Claims
OG exemplary drawing
 
21. A drill bit for use in a drilling assembly for drilling a borehole in a rock body and inserting a rock bolt within the borehole in a single pass, the drill bit comprising:
a drill bit body arranged to be detachably joined to the downhole end of a drill string, the drill bit having an external screw thread extending in an axial direction of the drill string, wherein the external screw thread is configured to cooperate with a thread engaging formation provided at or near a downhole end of a friction bolt sleeve so that the drill bit is able to be screwed into the friction bolt sleeve;
wherein the drill bit body is substantially frustoconical having a conically tapered side wall, and wherein the external screw thread extends along the length of the tapered side wall.