E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/30 (2006.01)
Patent
CA 2049282
Abstract Conventional earth boring reamers use a series of three or more hard-surfaced rollers which rotate upon a shaft and ream a previously drilled hole in the earth to a prescribed diameter. Normally, such shaft and roller combinations are held in place within the reamer body by bearing blocks. The bearing blocks fix the rollers at the proper position and provide surfaces to bear the axial thrust of the rollers. In this invention the bearing blocks are eliminated. The shafts are fixed within the reamer body using a primary and a secondary locking mechanism. Hardened thrust washers are utilized to counter the axial load of the rollers. The utility of this reamer design is: a smaller diameter body, matching the diameter of the drill string, can be utilized; there is no need for the construction of bearing blocks and the metal removal from the body needed to accommodate such blocks: and the use of thrust washers allows the roller shaft to be of a single diameter and reversible.
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