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Class Information
Number: 175/381
Name: Boring or penetrating the earth > Bit or bit element > Cutting edges relatively longitudinally movable during operation
Description: Apparatus in which the bit is provided with a plurality of cutter elements or cutting edges which elements or edges are connected to the bit in such a manner as to permit axial movement of one cutter element or cutting edge relative to another during normal operation of the bit.










Patents under this class:

Patent Number Title Of Patent Date Issued
8469120 Methods and apparatus for controlling cutting ribbons during a drilling operation Jun. 25, 2013
8191651 Sensor on a formation engaging member of a drill bit Jun. 5, 2012
8061455 Drill bit with adjustable cutters Nov. 22, 2011
8056651 Adaptive control concept for hybrid PDC/roller cone bits Nov. 15, 2011
7730970 Drilling efficiency through beneficial management of rock stress levels via controlled oscillations of subterranean cutting levels Jun. 8, 2010
7424922 Rotary valve for a jack hammer Sep. 16, 2008
7328755 Hydraulic drill bit assembly Feb. 12, 2008
7270196 Drill bit assembly Sep. 18, 2007
7258179 Rotary bit with an indenting member Aug. 21, 2007
7225886 Drill bit assembly with an indenting member Jun. 5, 2007
7198119 Hydraulic drill bit assembly Apr. 3, 2007
6527067 Lateral entry guidance system (LEGS) Mar. 4, 2003
6338390 Method and apparatus for drilling a subterranean formation employing drill bit oscillation Jan. 15, 2002
6213230 Drilling tool especially for the rotary percussion drilling of preferably rock Apr. 10, 2001
6142250 Rotary drill bit having moveable formation-engaging members Nov. 7, 2000
6116827 Drilling tool Sep. 12, 2000
5788430 Drilling tool for rotary percussion drilling Aug. 4, 1998
5388649 Drilling equipment and a method for regulating its penetration Feb. 14, 1995
5088568 Hydro-mechanical device for underground drilling Feb. 18, 1992
5018590 Electromagnetic drilling apparatus May. 28, 1991
5004056 Percussion-rotary drilling tool Apr. 2, 1991
4478296 Drill bit having multiple drill rod impact members Oct. 23, 1984
4386669 Drill bit with yielding support and force applying structure for abrasion cutting elements Jun. 7, 1983
4354561 Reciprocating drill bit Oct. 19, 1982
4105081 Rock-drilling and bolt-setting apparatus Aug. 8, 1978
4076087 Hole reamer Feb. 28, 1978
3957125 Multi-stage double-acting extendible and contractible shaft drive for drilling device May. 18, 1976











 
 
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