E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/75
E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 10/10 (2006.01) E21B 10/28 (2006.01)
Patent
CA 1083135
ABSTRACT The present invention relates generally to the drilling of large diameter shafts and, more partiuclarly, to the drill bits utilized in such applications. Large diameter bits have been used in mines for the drilling of rescue shafts, ventilation shafts and access shafts. A major problem with large diameter bits is that they are quite difficult to transport through small drifts or passages and very cumbersome to maneuver inside such structures. Quite often the size of these passages severely restricts the type and size drill bit utilized. Another problem encountered is that various size shafts are required for different applications in a single mine location. As a result either various sizes of drill bits must be available, which is quite costly, or compromises must be made in hole size selection. The present invention obviates the above-mentioned shortcomings by providing a large diameter drill bit having demountable ear assemblies which enables one bit to drill various size bores.
303195
Gowling Lafleur Henderson Llp
Smith International Inc.
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