Rock drill bit loading device

Details Rock drill bit loading device Rock drill bit loading device

E - Fixed Constructions

21

B

255/28

E21B 17/10 (2006.01) E21B 3/00 (2006.01) E21B 44/00 (2006.01)

Patent

CA 1095023

ROCK DRILL BIT LOADING DEVICE ABSTRACT OF THE DISCLOSURE A plurality of piston and cylinder assemblies ex- tend radially from the wall of the drill tube above the drill bit. A roller assembly is journalled in the distal ends of the pistons and engages the wall of the bore hole. The pis- tons are urged outwardly by fluid pressure to engage the wall and they are inclined approximately 10° from the longitudinal axis of the drill string so that when the drill string is ro- tated, the engagement of the inclined rollers against the wall urges the drill bit downwardly thus assisting in applying the required pressure to the rotating bit.

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