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Class Information
Number: 175/274
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > With shifting mechanism spring biased to operative position
Description: Apparatus in which the laterally movable cutter element is moved by a mechanism which is biased by a resilient means to move the cutter element to its operative position.

Sub-classes under this class:

Class Number Class Name Patents
175/279 Cam or gear means movable to shift cutter element 18
175/281 Cutter element substantially longitudinally movable on shaft 2
175/275 With separate latch 2

Patents under this class:

Patent Number Title Of Patent Date Issued
7686103 Drill bit with radially expandable cutter, and method of using same Mar. 30, 2010
7581591 Production casing ripper Sep. 1, 2009
7367412 Collapsible rock head May. 6, 2008
6550551 Apparatus to actuate a downhole tool Apr. 22, 2003
6364037 Apparatus to actuate a downhole tool Apr. 2, 2002
6357538 Bit torque limiting device Mar. 19, 2002
6286614 Motion compensator for drilling from a floater Sep. 11, 2001
5086852 Fluid flow control system for operating a down-hole tool Feb. 11, 1992
4015433 Method for settling anchoring device in the ground Apr. 5, 1977

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