Cutter element laterally shiftable below ground (e.g., expansible) > With shifting mechanism spring biased to operative position > Patents

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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	12
175/281	Cutter element substantially longitudinally movable on shaft	1
175/275	With separate latch	1

Patents under this class:

Patent Number	Title Of Patent	Date Issued
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