E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/76
E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 10/20 (2006.01) E21B 10/34 (2006.01) E21B 44/00 (2006.01)
Patent
CA 1108120
SYSTEM FOR BORING RAISES HAVING PORTIONS OF DIFFERENT DIAMETERS Abstract of the Disclosure A raise boring system is provided for boring raise holes wherein the finished raise holes have portions of different diameters The system includes a raise head with a central drive stem defining an axis of rotation. Primary cutter means are positioned on the raise head for disintegrating the earth formations out to a first radial distance from said axis of rotation. Expanding secondary cutter means are positioned on the raise head for selectively disintegrating earth formations from said first radial distance out to additional and greater radial distances from said axis of rotation. The expanding secondary cutter means may be selectively located in a first position either beneath or in the same plane as the primary cutter means during boring at said first radial distance from said axis of rotation and selectively located in additional positions for boring at greater radial distances from said axis of rotation. Expansion means are provided for moving said expanding secondary cutter means to said additional positions during the boring operation.
326823
Dresser Industries Inc.
Macrae & Co.
LandOfFree
System for boring raises having portions of different diameters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for boring raises having portions of different diameters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for boring raises having portions of different diameters will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-806094