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Class Information
Number: 175/379
Name: Boring or penetrating the earth > Bit or bit element > Cutting edge self-renewable during operation
Description: Apparatus in which the bit is provided with (1) relatively movable parts which are adapted to move during operation to provide a new cutting edge or (2) a body in the form of repeating similar structure extending longitudinally of the bit such that a new cutting edge is provided when the original cutter edge becomes worn.










Patents under this class:

Patent Number Title Of Patent Date Issued
8448726 Drill bits with bearing elements for reducing exposure of cutters May. 28, 2013
8141665 Drill bits with bearing elements for reducing exposure of cutters Mar. 27, 2012
8109346 Drill bit supporting multiple cutting elements with multiple cutter geometries and method of assembly Feb. 7, 2012
7677333 Drill bit with multiple cutter geometries Mar. 16, 2010
7594553 Composite tool insert Sep. 29, 2009
6962217 Rotary drill bit compensating for changes in hardness of geological formations Nov. 8, 2005
6932172 Rotary contact structures and cutting elements Aug. 23, 2005
6843333 Impregnated rotary drag bit Jan. 18, 2005
6547017 Rotary drill bit compensating for changes in hardness of geological formations Apr. 15, 2003
6510906 Impregnated bit with PDC cutters in cone area Jan. 28, 2003
6454028 Wear resistant drill bit Sep. 24, 2002
6095265 Impregnated drill bits with adaptive matrix Aug. 1, 2000
5868125 Crenelated abrasive tool Feb. 9, 1999
5836409 Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys Nov. 17, 1998
5679445 Composite cermet articles and method of making Oct. 21, 1997
5677042 Composite cermet articles and method of making Oct. 14, 1997
5615747 Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys Apr. 1, 1997
5301762 Drilling tool fitted with self-sharpening cutting edges Apr. 12, 1994
5135061 Cutting elements for rotary drill bits Aug. 4, 1992
5025873 Self-renewing multi-element cutting structure for rotary drag bit Jun. 25, 1991
5012863 Pipe milling tool blade and method of dressing same May. 7, 1991
4898252 Cutting structures for rotary drill bits Feb. 6, 1990
4813500 Expendable diamond drag bit Mar. 21, 1989
4727946 Rotary drill bits Mar. 1, 1988
4719979 Expendable diamond drag bit Jan. 19, 1988
4690228 Changeover bit for extended life, varied formations and steady wear Sep. 1, 1987
4596296 Rotary drill bits Jun. 24, 1986
4593777 Drag bit and cutters Jun. 10, 1986
4558753 Drag bit and cutters Dec. 17, 1985
4533004 Self sharpening drag bit for sub-surface formation drilling Aug. 6, 1985
4478296 Drill bit having multiple drill rod impact members Oct. 23, 1984
4394882 Continuous chain bit with downhole cycling capability Jul. 26, 1983
4359335 Method of fabrication of rock bit inserts of tungsten carbide (WC) and cobalt (Co) with cutting surface wear pad of relative hardness and body portion of relative toughness sintered as an inte Nov. 16, 1982
4324300 Rotary drill bit Apr. 13, 1982
D262630 Drill bit Jan. 12, 1982
4290498 Ablatible drill Sep. 22, 1981
4252201 Drilling method and apparatus Feb. 24, 1981
4234048 Drill bits embodying impregnated segments Nov. 18, 1980
4230194 Rotary drill bit Oct. 28, 1980
4230193 Rotary drill bit Oct. 28, 1980
4190126 Rotary abrasive drilling bit Feb. 26, 1980
4128136 Drill bit Dec. 5, 1978
4114322 Abrasive member Sep. 19, 1978











 
 
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