E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/2
E21B 25/00 (2006.01) E21B 4/14 (2006.01) E21B 6/06 (2006.01) E21B 21/12 (2006.01)
Patent
CA 1238035
ABSTRACT OF THE DISCLOSURE Apparatus for drilling a bore hole comprises a hammer and a series of dual wall drill tubes. The hammer is supplied with compressed air and is for use in applying successive percussive blows to a percussive drill cutting bit for taking core samples from the bottom of the bore hole while drilling same. An upstanding rig is provided at surface level to support the hammer and drill tubes and to transmit push-down or pull-up movement thereto. Ratchet means indexes rotationally the bit for drilling purposes and is operable by a portion of the supply of air. Means are provided to conduct from the bottom end of the bore hole that portion of air used by and exhausted from the percussive cutting bit and having core particles entrained therein. An annular flushing jet is provided to direct a portion of air upwardly through a sampling tube co-axial with the drill tube and hammer to induce a venturi to assist in conducting core particle entrained exhaust air upwardly.
476672
Ennis Melvyn S.j.
G. Ronald Bell & Associates
LandOfFree
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