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Class Information
Number: 175/271
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > With latch operated by fluid pressure or dropped element
Description: Apparatus in which the laterally movable cutter element is held in one position, either expanded or collapsed, by a movable latch member, said latch member being moved by (1) a fluid under pressure acting against the latch or a part connected thereto or (2) engaging a part which is specifically described as being dropped from above ground to an operative position below ground.

Patents under this class:

Patent Number Title Of Patent Date Issued
8485282 Earth-boring tools having expandable cutting structures and methods of using such earth-boring tools Jul. 16, 2013
RE41119 Borehole opener Feb. 16, 2010
7597158 Drilling and hole enlargement device Oct. 6, 2009
7370712 Under reamer May. 13, 2008
7195080 Expandable drilling tool and method Mar. 27, 2007
6953096 Expandable bit with secondary release device Oct. 11, 2005
6427788 Underreaming rotary drill Aug. 6, 2002
6360831 Borehole opener Mar. 26, 2002
5184687 Well reamer Feb. 9, 1993
4889197 Hydraulic operated underreamer Dec. 26, 1989

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