Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute
Patent
1991-03-14
1996-03-12
Bagnell, David J.
Boring or penetrating the earth
Boring by directly applying heat to fluidize or comminute
52744, 175213, 175333, 408 59, 408204, E21B 1006, E21B 2114, B23B 1734
Patent
active
054978416
ABSTRACT:
A masonry coring system for drilling vertical holes in a masonry wall comprises a drill bit in the form of a thin-walled cylinder having a cutting end face, a plurality of cutting elements fastened to the cutting end face, and a core breaker located within the interior of the cylinder. The coring system further comprises a driver plate fastened to the drill bit opposite the cutting end face, a driver shaft having a small axial hole therein fastened to the upper surface of the driver plate, a hydraulic motor to rotate the driver shaft, a non-rotating plastic pipe slightly larger than and surrounding the driver shaft, the plastic pipe resting on the driver plate and containing a plurality of holes located at the end near the driver plate. An air compressor forces compressed air through the axial hole in the driver shaft. An evacuation system withdraws the drilling dust through the annulus between the driver shaft and pipe and into a dust collector.
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Cox Robert D.
Mohlenhoff William
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