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Class Information
Number: 175/355
Name: Boring or penetrating the earth > Bit or bit element > Rolling cutter bit or rolling cutter bit element > Circumferentially displaced cutter axes
Description: Apparatus comprising a plurality of rolling cutter elements in which the axis of one cutter element lies in a diametric plane containing the bit axis while the axis of another cutter element is disposed in a plane which is displaced from said diametric plane through an angle measured in a plane perpendicular to the bit axis.

Sub-classes under this class:

Class Number Class Name Patents
175/357 Detachable multiaxis support or spider 5
175/358 Mutually contacting cutter supports 1
175/356 Stub axle only 12

Patents under this class:

Patent Number Title Of Patent Date Issued
7549488 Two-cone drill bit with enhanced stability Jun. 23, 2009
7299887 Roller bit with a journal pin offset from the central axis thereof Nov. 27, 2007
7188690 Drilling device and method for producing undercut holes Mar. 13, 2007
6944977 Drum for an excavator that can be used in particular for the production of vertical trenches in hard or very hard soils Sep. 20, 2005
6786288 Cutting structure for roller cone drill bits Sep. 7, 2004
6637527 Cutting structure for roller cone drill bits Oct. 28, 2003
5979573 Horizontal boring apparatus Nov. 9, 1999
RE34526 Two cone bit with non-opposite cones Feb. 1, 1994
RE34167 Drill bit and roller cutter for said drill bit Jan. 26, 1993
5147000 Disc drill bit Sep. 15, 1992
5064007 Three disc drill bit Nov. 12, 1991
4953641 Two cone bit with non-opposite cones Sep. 4, 1990
4832136 Drill bit and roller cutter for said drill bit May. 23, 1989
4751972 Revolving cutters for rock bits Jun. 21, 1988

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