E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/72
E21B 10/00 (2006.01) E21B 10/22 (2006.01) E21B 10/24 (2006.01) E21B 10/30 (2006.01) E21B 10/52 (2006.01)
Patent
CA 1095891
TITLE: REAMER ABSTRACT OF DISCLOSURE: A roller reamer for boring holes in the earth is useful for both well drilling and in mining. The reamer rollers are replaceably mounted on the reamer body in a manner that facilitates easy replacement so that the body can be reused after its initial comple- ment of rollers is worn out. To that end, the rollers are rotatably mounted on shafts whose ends are support- ed by blocks inserted in the reamer body. To prevent shaft rotation, one end of each shaft is welded, pinned, or otherwise nonrotatably anchored to its mounting block. Each block makes an interference fit with the body socket in which it is disposed. The blocks are stepped for quick release. Access openings to the backs of the blocks facilitates knockout. Knockout of the stepped blocks is achieved by wedge means. Drilling mud may have access to contacting surfaces of rollers and shafts to lubricate same. Protective seal means may be provided between each roller and shaft at the upper ends thereof so that the mud must flow upwardly to reach the space between shaft and roller and dense solids will be excluded by gravity. Grease lubrication may be provided, the rollers being sealed to the shafts at both ends. With mud lubrication, axial loads on the rollers may be taken by the ends of the rollers bearing on the blocks. With protected mud lubricaticn and grease lubrication, thrust may be taken by thrust bearins surfaces provided within the protected or sealed zone, e.g. by a flange on each shaft engaging an internal groove formed by a two piece roller, or a ball lock between opposed annular grooves in shaft and roller.
303736
Smart & Biggar
Smith International Inc.
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