Source: http://www.google.com/patents/US7861808?dq=5,867,764
Timestamp: 2014-11-27 01:45:57
Document Index: 401930667

Matched Legal Cases: ['art 356', 'application No. 2', 'Application No. 2', 'application No. 0606575', 'application No. 0606575', 'application No. 2', 'application No. 2', 'application No. 2', 'application No. 2', 'application No. 0604699']

Patent US7861808 - Cutter for maintaining edge sharpness - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA cutter comprising a base portion, an ultrahard layer disposed on said base portion, and at least one recessed region on an outer surface of the cutter. A start of the recessed region disposed a selected distance behind a cutting face....http://www.google.com/patents/US7861808?utm_source=gb-gplus-sharePatent US7861808 - Cutter for maintaining edge sharpnessAdvanced Patent SearchPublication numberUS7861808 B2Publication typeGrantApplication numberUS 11/365,298Publication dateJan 4, 2011Filing dateMar 1, 2006Priority dateMar 11, 2005Fee statusPaidAlso published asCA2538807A1, CA2538807C, US20060201712Publication number11365298, 365298, US 7861808 B2, US 7861808B2, US-B2-7861808, US7861808 B2, US7861808B2InventorsYouhe Zhang, Yuelin ShenOriginal AssigneeSmith International, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (32), Non-Patent Citations (18), Classifications (5), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetCutter for maintaining edge sharpnessUS 7861808 B2Abstract A cutter comprising a base portion, an ultrahard layer disposed on said base portion, and at least one recessed region on an outer surface of the cutter. A start of the recessed region disposed a selected distance behind a cutting face.
What is claimed is: 1. A cutter comprising:
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims benefit under 35 U.S.C. �119 to U.S. Provisional Application Ser. No. 60/660,765, filed on Mar. 11, 2005. This provisional application is hereby incorporated by reference in its entirety.
Scoop top cutters, as shown at 80 in FIG. 5 (U.S. Pat. No. 6,550,556), have also provided some benefits against the adverse effects of impact loading. This type of prior art cutter 80 is made with a �scoop� or depression 90 formed in the top working surface 82 of an ultra hard layer 84. The ultra hard layer 84 is bonded to a substrate 86 at an interface 88. The depression 90 is formed in the critical region 56. The upper surface 92 of the substrate 86 has a depression 94 corresponding to the depression 90, such that the depression 90 does not make the ultra hard layer 84 too thin. The interface 88 may be referred to as a non-planar interface (NPI).
SUMMARY OF INVENTION In one aspect, the invention provides an improved cutter. In one aspect, the cutter comprises a base portion, an ultrahard layer disposed on said base portion, and at least one recessed region on the outer surface of the cutter. A start of the at least one recessed region is disposed a selected distance behind the cutting face.
DETAILED DESCRIPTION The present invention relates to shaped cutters that provide advantages when compared to prior art cutters. In particular, embodiments of the present invention relate to cutters that have structural modifications to the cutting edge in order to improve cutter performance. As a result of the modifications, embodiments of the present invention may provide improved cooling, higher cutting efficiency, improved cutter durability, and longer lasting cutters when compared with prior art cutters. More specifically, embodiments of the present invention may improve cutting edge sharpness during use and reduce potential mechanical or thermal breakdown of the cutter.
FIG. 10 shows a cutter formed in accordance with an embodiment of the present invention. In FIG. 10, a cutter 330 comprises a substrate or �base portion,� 332, on which an ultrahard layer 334 is disposed. In this embodiment, the ultrahard layer 334 comprises a polycrystalline diamond layer. As explained above, when a polycrystalline diamond layer is used, the layer may further be partially or completely leached. A beveled, or chamfered, edge 336 may be provided on at least one side of the ultrahard layer 334, but more commonly, may be placed on at least two sides, so that the cutter may be removed and reoriented for use a second time. Further, at least one recessed region 338 is formed on an outer surface of the cutter behind the cutting face 349 of the ultrahard layer 334. In one embodiment, a start 356 of the recessed region 338 is disposed a selected distance behind the cutting face 349. In one embodiment, the recessed region 338 comprises a notch, or indentation, formed behind a chamfered edge 336 of the ultrahard layer 334. As shown in FIG. 10, in one embodiment, two recessed regions, or notches, 338, 340 are formed behind the chamfered edge 336 of the ultrahard layer 334. The recessed regions 338, 340 are notches formed behind the chamfered edge 336 and may extend across the interface 342 between the ultrahard layer 334 and the substrate 332. The recessed regions 338, 340 increase the surface area of the ultrahard layer 334, and thus increase the area that may be leached. Increased leaching area near the cutting face 349 may extend the life of the cutter. Multiple recessed regions may be placed around the circumference of the cutter 300 so that the cutter 300 may be removed and reoriented for multiple uses. While the recessed regions 338, 340 appear to be oval in shape, one of ordinary skill in the art will appreciate that other shapes and sizes of recessed regions may be used without departing from the scope of the invention.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3745623Dec 27, 1971Jul 17, 1973Gen ElectricDiamond tools for machiningUS3858671Apr 23, 1973Jan 7, 1975Kennametal IncExcavating toolUS4104344Sep 12, 1975Aug 1, 1978Brigham Young UniversityHigh thermal conductivity substrateUS4288248Nov 13, 1978Sep 8, 1981General Electric CompanyHigh pressure bonding of diamond or boron nitride with sintering aid, leaching, porosityUS4804049Nov 30, 1984Feb 14, 1989Nl Petroleum Products LimitedRotary drill bitsUS4993505Dec 18, 1989Feb 19, 1991Smith International, Inc.Stress relieving by leaching cobalt from tungsten carbide; purification; strengthening the cutterUS5316095 *Jul 7, 1992May 31, 1994Baker Hughes IncorporatedDrill bit cutting element with cooling channelsUS5332051Mar 31, 1993Jul 26, 1994Smith International, Inc.Optimized PDC cutting shapeUS5341890Jan 8, 1993Aug 30, 1994Smith International, Inc.Ultra hard insert cutters for heel row rotary cone rock bit applicationsUS5655612Jun 6, 1995Aug 12, 1997Baker Hughes Inc.Earth-boring bit with shear cutting gageUS5662183Aug 15, 1995Sep 2, 1997Smith International, Inc.High strength matrix material for PDC drag bitsUS5706906Feb 15, 1996Jan 13, 1998Baker Hughes IncorporatedSuperabrasive cutting element with enhanced durability and increased wear life, and apparatus so equippedUS5947216Nov 24, 1997Sep 7, 1999Smith International, Inc.Cutter assembly for rock bits with back support grooveUS6003623Apr 24, 1998Dec 21, 1999Dresser Industries, Inc.Cutters and bits for terrestrial boringUS6145607 *Nov 2, 1998Nov 14, 2000Camco International (Uk) LimitedPreform cutting elements for rotary drag-type drill bitsUS6408959 *Feb 19, 2001Jun 25, 2002Kenneth E. BertagnolliPolycrystalline diamond compact cutter having a stress mitigating hoop at the peripheryUS6488106 *Feb 5, 2001Dec 3, 2002Varel International, Inc.Superabrasive cutting elementUS6527069 *Sep 26, 2000Mar 4, 2003Baker Hughes IncorporatedSuperabrasive cutter having optimized table thickness and arcuate table-to-substrate interfacesUS6550556Dec 7, 2000Apr 22, 2003Smith International, IncUltra hard material cutter with shaped cutting surfaceUS6604588Sep 28, 2001Aug 12, 2003Smith International, Inc.Gage trimmers and bit incorporating the sameUS6823952Oct 26, 2000Nov 30, 2004Smith International, Inc.Structure for polycrystalline diamond insert drill bit bodyUS6904984Jun 20, 2003Jun 14, 2005Rock Bit L.P.Stepped polycrystalline diamond compact insertUS7086489Apr 25, 2005Aug 8, 2006Smith International, Inc.Multi-lobed cutter element for drill bitUS20030235691Jun 20, 2003Dec 25, 2003Griffin Nigel DennisPolycrystalline diamond partially depleted of catalyzing materialBE1012119A3 Title not availableCA2538807A1Mar 8, 2006Sep 11, 2006Youhe ZhangCutter for maintaining edge sharpnessCA2541267A1Mar 29, 2006Oct 4, 2006Smith InternationalStress relief feature on pdc cutterEP1201873A2Oct 26, 2001May 2, 2002Smith International, Inc.PDC bit with stress relief grooveGB2314360A Title not availableGB2361936A Title not availableGB2424013A Title not availableGB2424910A Title not available* Cited by examinerNon-Patent CitationsReference1CA Exam Report dated Jul. 24, 2007 for related CA application No. 2,541,267.2CA Exam report dated Oct. 2, 2008 for corresponding CA application 2,538,807.3CA Examination Report for CA App. No. 2,538,807 dated Jul. 20, 2009.4Combined Search and Examination Report issued in UK Application No. GB0604699.9 dated Jul. 7, 2006 (6 pages).5Examiner's Report dated Sep. 4, 2007 for Canadian Application No. 2,538,807, (3 pages).6Final Office Action dated Apr. 4, 2008 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.7Final Office Action dated Jan. 27, 2009 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.8GB Exam Report dated Jul. 31, 2006 for related GB application No. 0606575.9.9Non-Final Office Action dated Jul. 28, 2008 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.10Non-Final Office Action dated Jun. 25, 2009 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.11Non-Final Office Action dated Sep. 21, 2007 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.12Notice of Allowance dated Jan. 13, 2010 for related U.S. Appl. No. 11/372,614, filed Mar. 10, 2006.13Response file Mar. 23, 2007 to GB Exam Report dated Jul. 31, 2006 for related GB application No. 0606575.9.14Response filed Jan. 12, 2010 to CA Exam Report dated Jul. 20, 2009 for corresponding CA application No. 2,538,807.15Response filed Jan. 18, 2008 to CA Exam Report dated Jul. 24, 2007 for related CA application No. 2,541,267.16Response filed Mar. 18, 2009 to CA Exam Report dated Oct. 2, 2008 for corresponding CA application No. 2,538,807.17Response filed Mar. 4, 2008 to CA Exam Report dated Sep. 4, 2007 for corresponding CA application No. 2,538,807.18Response filed Sep. 26, 2006 to UK Combined Search and Examination Report dated Jul. 7, 2006 for corresponding GB application No. 0604699.9.Classifications U.S. Classification175/428, 175/432International ClassificationE21B10/58Cooperative ClassificationE21B10/567European ClassificationE21B10/567Legal EventsDateCodeEventDescriptionJun 4, 2014FPAYFee paymentYear of fee payment: 4Mar 1, 2006ASAssignmentOwner name: SMITH INTERNATIONAL, INC., TEXASFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHANG, YOUHE;SHEN, YUELIN;REEL/FRAME:017638/0338Effective date: 20060228RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google