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Class Information
Number: 175/334
Name: Boring or penetrating the earth > Bit or bit element > Rolling cutter bit or rolling cutter bit element > Bit with leading cutter forming smaller diameter initial bore
Description: Apparatus in which the rolling cutter element or a fixed cutting edge of the bit forms a first bore of definable diameter, and a trailing rolling cutter or fixed cutting edge increases the diameter of the first bore so that the boring outline of the bit will describe at least one peripheral axial step.










Sub-classes under this class:

Class Number Class Name Patents
175/335 Leading fixed cutter 18


Patents under this class:

Patent Number Title Of Patent Date Issued
8584776 Methods, systems, and tool assemblies for distributing weight between an earth-boring rotary drill bit and a reamer device Nov. 19, 2013
8347989 Hole opener with hybrid reaming section and method of making Jan. 8, 2013
8118370 Milling head and method for machining pile heads Feb. 21, 2012
8028769 Reamer with stabilizers for use in a wellbore Oct. 4, 2011
7992658 Pilot reamer with composite framework Aug. 9, 2011
7942217 Cutting apparatus for a microtunnelling system May. 17, 2011
7845430 Compliantly coupled cutting system Dec. 7, 2010
7712549 Drilling tool May. 11, 2010
7341119 Hydro-lifter rock bit with PDC inserts Mar. 11, 2008
7152701 Cutting element structure for roller cone bit Dec. 26, 2006
7028790 Rotary drill bit Apr. 18, 2006
6932171 Ground drilling machine Aug. 23, 2005
6729420 Multi profile performance enhancing centric bit and method of bit design May. 4, 2004
6488103 Drilling tool and method of using same Dec. 3, 2002
6439326 Centered-leg roller cone drill bit Aug. 27, 2002
RE36817 Method and apparatus for drilling and enlarging a borehole Aug. 15, 2000
5497842 Reamer wing for enlarging a borehole below a smaller-diameter portion therof Mar. 12, 1996
5337843 Hole opener for the top hole section of oil/gas wells Aug. 16, 1994
5147000 Disc drill bit Sep. 15, 1992
5139098 Combined drill and underreamer tool Aug. 18, 1992
5064007 Three disc drill bit Nov. 12, 1991
4915181 Tubing bit opener Apr. 10, 1990
4706765 Drill bit assembly Nov. 17, 1987
4627501 Borer head with planetary gearing Dec. 9, 1986
4186809 Steep angle raise bit Feb. 5, 1980
4186808 Earth boring machine with crushing rollers Feb. 5, 1980
4141421 Under reamer Feb. 27, 1979
4076087 Hole reamer Feb. 28, 1978
4036314 Hole opener with improved rotary cutter mounting Jul. 19, 1977
4031974 Boring apparatus capable of boring straight holes Jun. 28, 1977
4010808 Expandable raise bit Mar. 8, 1977
3945447 Boring apparatus Mar. 23, 1976











 
 
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