US 6,981,559 B2
Rock-bolting apparatus and method
Peter John Rubie, Toowoomba (Australia); and Alan John Russell, Toowoomba (Australia)
Assigned to RME Underground Pty Ltd., Toowoomba (Australia)
Filed on Dec. 11, 2003, as Appl. No. 10/733,081.
Application 10/733081 is a continuation in part of application No. PCT/AU02/00791, filed on Jun. 18, 2002.
Claims priority of application No. PR5765 (AU), filed on Jun. 18, 2001.
Prior Publication US 2004/0177979 A1, Sep. 16, 2004
Int. Cl. E21B 7/04 (2006.01)
U.S. Cl. 173—184 4 Claims
OG exemplary drawing
 
1. An articulated boom arm for a rock boring machine, said arm comprising a first kinked member having a drill guide at one end and a base pivot at the other, and a pair of pivoted links, one of said links having a first end pivoted at said base pivot, the other of said links having a drill pivotally mounted at a first end thereof, the second ends of said first and second links being pivoted to each other whereby said drill is reciprocally linearly movable along said first member with a drill bit aligned with said drill guide and at one extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend towards said drill guide and at the other extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend away from said drill guide.