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Class Information
Number: 175/289
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > Cutter element shifted by longitudinally relatively movable parts > Cam or gear engaging cutter element > Cutter element spring biased to retracted position
Description: Apparatus in which the laterally movable cutter element is resiliently urged to move laterally of the bit head or shaft in the direction in which the cutter element would be in an inoperative or noncutting position.










Patents under this class:

Patent Number Title Of Patent Date Issued
8371389 Differential shifting tool and method of shifting Feb. 12, 2013
8360173 Positive engagement underreamer and method Jan. 29, 2013
7823663 Expandable reamer Nov. 2, 2010
7581591 Production casing ripper Sep. 1, 2009
6920923 Section mill for wells Jul. 26, 2005
6378632 Remotely operable hydraulic underreamer Apr. 30, 2002
6206114 Tool for transporting cutting means to and from a ground drill Mar. 27, 2001
6059053 Retraction system for a latching mechanism of a tool May. 9, 2000
5975222 Reverse circulation drilling system with bit locked underreamer arms Nov. 2, 1999
5560440 Bit for subterranean drilling fabricated from separately-formed major components Oct. 1, 1996
5361859 Expandable gage bit for drilling and method of drilling Nov. 8, 1994
5351758 Tubing and profile reaming tool Oct. 4, 1994
5010955 Casing mill and method Apr. 30, 1991
4998981 Bit for drilling an undercut hole Mar. 12, 1991
4878549 Wire line core barrel Nov. 7, 1989
4614242 Bore hole enlarging arrangement and method Sep. 30, 1986
4575294 Anchoring bolt Mar. 11, 1986
4497383 Undercutting device for anchor holes Feb. 5, 1985
4458761 Underreamer with adjustable arm extension Jul. 10, 1984
4444279 Drilling tool Apr. 24, 1984
4411324 Bore undercutting tool Oct. 25, 1983











 
 
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