E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
77/28
E21B 10/32 (2006.01) B23B 51/00 (2006.01)
Patent
CA 2020134
ABSTRACT OF THE DISCLOSURE A device for cutting an undercut in a borehole at a location spaced from the surface of a material into which the borehole is formed, including a housing with a bore therethrough and a guide sleeve rotatably supported in the housing bore and having an eccentric bore therein. A bushing with an eccentric bore is rotatably supported in the guide sleeve bore. A drive shaft is rotatably supported in and extends through the eccentric bore of the housing and has a cutter head at one end. The drive shaft can be shifted from a centred position within the housing bore into an eccentric position by rotation of the bushing relative to the guide sleeve. In the eccentric position, the cutter head can penetrate into and form an undercut in the surface of the borehole. A displaceable snap-in element in the housing prevents rotation of the guide sleeve. When the maximum eccentricity of the drive shaft is reached, the snap-in element is disengaged from the guide sleeve by an actuating cam on the bushing. Subsequently, the guide sleeve and the bushing can be rotated together through at least 360° degrees for cutting the undercut. A blocking member prevents rotation of the guide sleeve during notation of the bushing back into the centred position.
Bergner Arndt
Gierczak Eugene J. A.
LandOfFree
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