US 12,486,769 B2
Dolly for rockbolt
Jason Matthews, Smeaton Grange (AU); and Matthew Holden, Smeaton Grange (AU)
Assigned to FCI Holdings Delaware, LLC, Wilmington, DE (US)
Appl. No. 18/688,046
Filed by FCI Holdings Delaware, Inc., Wilmington, DE (US)
PCT Filed Jun. 2, 2023, PCT No. PCT/AU2023/050478
§ 371(c)(1), (2) Date Feb. 29, 2024,
PCT Pub. No. WO2023/230670, PCT Pub. Date Dec. 7, 2023.
Claims priority of application No. 2022901533 (AU), filed on Jun. 3, 2022.
Prior Publication US 2024/0360760 A1, Oct. 31, 2024
Int. Cl. E21D 21/00 (2006.01); E21D 20/00 (2006.01)
CPC E21D 21/0053 (2016.01) [E21D 20/003 (2013.01); E21D 21/008 (2013.01); E21D 21/0086 (2013.01); E21D 21/0093 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A rock bolt dolly for connecting a self-drilling rock bolt to a rock bolting apparatus, such as a drifter, rock drill or the like, and arranged to transfer torque applied to the dolly by the rock bolting apparatus to the rock bolt during installation of the rock bolt, the rock bolt comprising an externally threaded rod having a proximal end and a distal end defining a drill bit, the dolly defining a coupling means at its proximal end for engagement with the rock bolting apparatus, the dolly further comprising:
a drive shaft defining a proximal end and a distal end, the drive shaft defining an engagement means at the distal end for engagement with a corresponding engagement means located on or defined at the proximal end of the rock bolt;
a sleeve mounted over the distal end of the drive shaft and arranged to slide along and over the drive shaft and defining a female engagement means at a distal end, for engaging with a nut or the like threaded onto the proximal end of the rock bolt, the interior of the sleeve and exterior of the drive shaft being configured such that the drive shaft and sleeve rotate together about their central axis, and
a biasing means for biasing the distal end of the sleeve away from the distal end of the drive shaft;
the arrangement being such that in a first mode, with the biasing means compressed, the engagement means of the drive shaft is engaged with the corresponding engagement means located on or defined on the proximal end of the rock bolt, and the female engagement means of the sleeve is engaged with the nut or the like threaded onto the proximal end of the rock bolt so that the dolly rotates the rod and nut together such that the nut does not translate along the rod, and in a second mode, with the biasing means expanded, the engagement means of the drive shaft is disengaged from the corresponding engagement means and the female engagement means of the sleeve is engaged with the nut or the like and the dolly rotates the nut only which translates along the externally threaded rod of the rock bolt.