F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent
F - Mech Eng,Light,Heat,Weapons
16
C
308/9
F16C 21/00 (2006.01) E21B 17/10 (2006.01) E21B 19/24 (2006.01)
Patent
CA 1206998
ABSTRACT OF THE DISCLOSURE The invention relates to a guide bushing used to maintain alignment of a rotary shaft and in particular to a guide bushing for use as a mining deck bushing. When drilling blast holes in surface mining operations, it is conventional to pass the drill pipe through a deck bushing located on the floor or deck of the blast hole drill. During drilling operations the drill pipe has a tendency to run off laterally, and vibrate vertically. The purpose of the deck bushing is to keep the drill pipe as straight as possible, and prevent wear of the more costly deck. The pres- ent invention provides a guide bushing for use as a deck bushing and is equipped with a rotatably inner sleeve which is supported by angular journal bearing surfaces and ball bearings located in elongate annular grooves, which allow the guide bushing to main- tain alignment of the drill pipe without premature failure of the ball bearings, grooves or other bearing surfaces.
451864
Smart & Biggar
Western Rock Bit Company Limited
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