Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1988-11-22
1989-09-05
Novosad, Stephen J.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
175321, 175415, 175417, 464162, E21B 1038, E21B 17046
Patent
active
048629766
ABSTRACT:
In a percussion drilling tool, a bit is connected to a drill motor through a mating spline connection. External splines on the bit engage internal splines in the drill motor and have respective load bearing faces disposed in a plane extending radially outwardly from central axes. The splines also include a crest land, and a root land. When the splines are in an abutting centered position, there is a uniform radially measured outer clearance between the external spline crests and the internal spline roots, and a uniform radially measured inner clearance between the external spline roots and the internal spline crests. The outer clearance is less than the inner clearance to prevent abrasive damage below the root diameter of the bit resulting from axial relative movement so that the external spline crests will engage the associated internal spline roots while continually maintaining a spacing between the external spline roots and the internal spline crests.
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Novosad Stephen J.
Sandvik Rock Tools, Inc.
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