Patent ID: 9745800
Date: 2017-08-29
CPC Classifications: B23P,E21B

Claim:
1. An expandable reamer apparatus for enlarging a borehole in a subterranean formation, comprising: a tubular body; at least one convexly curved blade track carried by the tubular body; and at least one blade engaged with the at least one convexly curved blade track and configured to slide along the at least one convexly curved blade track between a retracted blade position and an expanded blade position, wherein the at least one blade is cantilevered beyond a lower longitudinal end of the at least one convexly curved blade track in the expanded blade position, the lower longitudinal end located below an upper longitudinal end of the at least one convexly curved blade track when the expandable reamer apparatus is disposed vertically in a borehole, wherein a convexly curved surface of the at least one convexly curved blade track faces the at least one blade engaged therewith, wherein the at least one blade is retained on the tubular body by sloped side surfaces of the tubular body abutting against complementary sloped side surfaces of the at least one blade, the complimentary side surfaces of the at least one blade and the tubular body having a dovetail shape.