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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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