E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/80
E21B 10/34 (2006.01)
Patent
CA 1125274
ABSTRACT OF THE DISCLOSURE The specification of the present invention discloses a rotary bore hole enlarging bit used in forming bore holes in the earth's surface. The enlarging bit comprises an elongate mandrel member having a central opening therethrough; a body member reciprocable on the mandrel member; and a piston chamber on the mandrel member and body member for shifting the body member in one longitudinal direction. The mandrel member has an inlet passage leading to the piston chamber and either the mandrel or body has a plurality of circumferentially spaced cutter supports thereon. An expander is provided on the other member and the cutter supports for expanding the cutter supports outwardly upon movement of the body member on the mandrel member in one longitudinal direction. A fluid passage in the body member and cutter supports leads from the piston chamber and exits from the cutter supports. The passage is of relatively small flow area when the cutter supports are retracted and large flow area when the cutter supports are expanded to maintain a relatively high pressure in the piston chamber during expansion of the cutter supports; and cutter elements on the cutter supports. After the cutters arefully expanded, additional air is utilized to clean and cool the cutters.
380476
Johnson Douglas S. Q.c.
Tri-State Oil Tools Industries Inc.
LandOfFree
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