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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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