Patents Represented by Attorney, Agent or Law Firm John J. Prizzi
  • Agricultural insert
    Patent number: 5159985
    Abstract: An insert for use in an agricultural tool having a cutting edge for forming a furrow. The insert includes an elongated wedge having a leading end, a trailing end, a top surface, a first side surface and a second opposing side surface coterminous therewith defining a longitudinally extending lowermost edge. The first and second side surface converge from the trailing end to the leading end and diverge from the lowermost edge to the top surface to form a v-shape leading end. In a preferred embodiment the insert includes a means for aligning the lowermost edge of the insert with the cutting edge of the tool.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: November 3, 1992
    Assignee: Kennametal Inc.
    Inventor: Don C. Rowlett
  • CVD and PVD coated cutting tools
    Patent number: 5143488
    Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one chemical vapor deposited (CVD) layer and at least one physical vapor deposited (PVD) layer. The outermost layer of the coating is a PVD layer, containing residual compressive stresses. The substrate is a composite having hard refractory grains bonded together by a binder material.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: September 1, 1992
    Assignee: Kennametal Inc.
    Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
  • Digging tooth
    Patent number: 5143163
    Abstract: A replaceable digging tooth for an earth auger including a generally oblong body member and a shank depending from the body member and receivable in a support block of the earth auger. The body member includes an elongated leading surface, an elongated trailing surface and first and second side surfaces. The leading surface, trailing surface and first and second side surfaces terminate in a forward working face having a plurality of inserts. Each insert has a generally cylindrical portion integral a top portion which tapers to a point to form a conical tip. The tips of the inserts are aligned to define a linear cutting line which is inclined with respect to a reference plane perpendicular to the axis of the shank and the axes of the inserts are aligned parallel to form a cutting plane which is inclined with respect to the reference plane.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: September 1, 1992
    Assignees: Kennametal Inc., Reedrill Inc.
    Inventors: Stephen P. Stiffler, David J. Waite, Robert L. Frost, Wayne H. Beach
  • Ceramic cutting tool with chip control
    Patent number: 5141367
    Abstract: A ceramic cutting insert for high speed machining of materials is provided having an integral chip control surface thereon.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: August 25, 1992
    Assignee: Kennametal, Inc.
    Inventors: Craig W. Beeghly, Deepak P. Ahuja, Pankaj K. Mehrotra, Kenneth L. Niebauer
  • Cemented carbide tip
    Patent number: 5141289
    Abstract: A cemented carbide tip for a cutter bit is provided. The tip is rotationally symmetric about its longitudinal axis and has a socket in its rear end for brazine to a steel protrusion on a steel tool shank. A surface of the socket has bumps thereon to maintain a substantially uniform braze joint thickness.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: August 25, 1992
    Assignee: Kennametal Inc.
    Inventor: Stephen P. Stiffler
  • Rotatable cutting tool having an insert with flanges
    Patent number: 5131725
    Abstract: A rotatable cutting tool for impacting and fragmenting a substrate. The tool has a tool body containing a valve seat in the forward end thereof wherein a hard insert affixes to the tool body within the valve seat. The hard insert comprises an integral tip segment and an integral axially rearward segment joined to the tip segment by an integral mediate segment. A trio of generally vertically disposed flanges project radially outward from the mediate segment. The flanges are integral with the mediate portion. Each flange presents at least one side surface. During operation, the substrate fragments impinge against the side surface to urge the tool to rotate about its central longitudinal axis.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: July 21, 1992
    Assignee: Kennametal Inc.
    Inventors: Don C. Rowlett, Stephen P. Stiffler, Wayne H. Beach
  • Insert having a surface of carbide particles
    Patent number: 5131481
    Abstract: An insert for insertion into a bore opening formed within a working face of a tool and a method of making the same. The insert includes a head having an integral body adapted for insertion into the bore. The insert has carbide particles adhered to the insert surface to resist removal of the insert from the bore opening.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: July 21, 1992
    Assignee: Kennametal Inc.
    Inventor: Emlyn N. Smith
  • Process of making mining/construction tool bit body fabricated from MN/B steel alloy composition
    Patent number: 5112411
    Abstract: A mining and construction bit body is composed of a Mn-B steel alloy composition. The alloy content of the composition in percents by weight includes: carbon, 0.33-0.38; manganese, 1.10-1.35; boron, 0.0005 minimum; silicon 0.15-0.30; sulfur, 0.045 maximum; and phosphorus, 0.035 maximum. The composition has a minimum hardenability of 47 Rockwell C at the Jominy 6/16 position and a maximum as-rolled hardness of 22 Rockwell C such that without anneal the composition meets hardenability and machinability requirements that make it useful for fabricating mining and construction bit bodies of all sizes.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: May 12, 1992
    Assignee: Kennametal Inc.
    Inventor: Mark S. Greenfield
  • Air hardening steel
    Patent number: 5094923
    Abstract: An air hardened steel having a reduced nickel content and acceptable impact toughness. The air hardened steel may include 0.18-0.35 w/o carbon, 1.3-1.75 w/o silicon, 1.3-2.0 w/o manganese, 0.65-2.1 w/o chromium, 0.9-2.0 w/o nickel and 0.2-0.35 w/o molybdenum and the balance impurities, deoxidants, and iron.
    Type: Grant
    Filed: April 24, 1990
    Date of Patent: March 10, 1992
    Assignee: Kennametal Inc.
    Inventor: James P. Materkowski
  • High hardness/high compressive stress multilayer coated tool
    Patent number: 5075181
    Abstract: A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost or first layer is composed of a group IVB (titanium, hafnium or zirconium) metal nitride. The middle or second layer is composed of a group IVB carbonitride. The outermost or third layer is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: December 24, 1991
    Assignees: Kennametal Inc., Balzers Limited
    Inventors: Dennis T. Quinto, Helmut J. Kaufmann
  • Method and apparatus for balancing a rotary tool assembly
    Patent number: 5074723
    Abstract: The present invention entails a method and apparatus for balancing a high speed rotary tool assembly. A pair of closed balancing rings are journalled about a cylindrical bearing surface formed around a rotary tool holder with each ring being rotatively mounted about the bearing surface independently of each other. The tool holder is adapted to receive and hold a cutting tool. After determining the unbalance of the tool holder and cutting tool, the rings are rotatively adjusted about the bearing surface to create an unbalance within the tool rings and the position of the tool rings is adjusted such that the created unbalance of the tool rings is disposed opposite the determined unbalance of the rotary tool holder and cutting tool.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: December 24, 1991
    Assignee: Kennametal Inc.
    Inventors: Ted R. Massa, David R. Siddle
  • Alumina-zirconia-silicon carbide-magnesia ceramic cutting tools
    Patent number: 5024976
    Abstract: A metalcutting insert is provided with an alumina based ceramic composition composed of (in volume percent, v/o): about 1.5 to 37.5 silicon carbide whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount effective to enhance the metalcutting lifetime of the cutting edge of the insert; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 2 v/o of the alumina based ceramic composition is tetragonal zirconia.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: June 18, 1991
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman
  • Multilayer coated cemented carbide cutting insert
    Patent number: 4984940
    Abstract: An indexable metalcutting insert is provided having a cobalt cemented tungsten carbide substrate wit a multilayer refractory coating thereon. The substrate has a cobalt content of 6.1 to 6.5 weight percent and is characterized by a hardness of 90.8 to 91.6 Rockwell A and a magnetic coercive force of 110 to 180 oerstads. The coating contains at least a plurality of alumina layers which are separated from and bonded to each other by a group IVB metal nitride, such as titanium nitride, and which are bonded to the substrate by a backing layer of 5 to 8 .mu. in thickness, composed of a carbide and/or carbonitride of titanium, zirconium and/or hafnium.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: January 15, 1991
    Assignee: Kennametal Inc.
    Inventors: William A. Bryant, George P. Grab
  • Rotatable tool having a carbide insert with bumps
    Patent number: 4981328
    Abstract: A rotatable cutting tool having a tool body with a socket contained in the forward end thereof wherein a hard insert is affixed to the tool body within the socket. The hard insert comprises an integral tip portion and an integral cylindrical flange portion joined to the tip portion by integral mediate portion. An integral boss projects from the bottom surface of the flange portion wherein the boss is of a generally frusto-conical shape which corresponds to the generally frusto-conical volume defined by the socket. A plurality of bumps projects from the bottom surface of the flange portion and the frusto-conical surface of the boss to provide for a braze joint of uniform thickness between the hard insert and the tool body.
    Type: Grant
    Filed: August 22, 1989
    Date of Patent: January 1, 1991
    Assignee: Kennametal Inc.
    Inventors: Stephen P. Stiffler, Ray C. MacIntyre, Daniel C. Sheirer, Wayne H. Beach
  • Alumina-zirconia-silicon carbide-magnesia compositions and articles made therefrom
    Patent number: 4965231
    Abstract: An alumina based ceramic composition is provided containing (in volume percent, v/o): about 1.5 to 17.5 silicon carbide whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount of about 0.03 to 3; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 4 v/o of the alumina based ceramic composition is tetragonal zirconia.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: October 23, 1990
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman
  • Alumina-zirconia-silicon carbide-magnesia ceramics
    Patent number: 4960735
    Abstract: An alumina based ceramic composition is provided containing (in volume percent, v/o): about 1.5 to 37.5 whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount of about 0.03 to 3 v/o; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 2 v/o of the alumina based ceramic composition is tetragonal zirconia.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: October 2, 1990
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman
  • Alumina-zirconia-carbide whisker reinforced cutting tools
    Patent number: 4959332
    Abstract: A metalcutting insert is provided with an alumina based ceramic composition composed of (in volume percent, v/o): about 1.5 to 12.5 silicon carbide whiskers and about 7.5 to 17.5 v/o zirconia. The silicon carbide whiskers and zirconia are substantially homogeneously distributed in an alumina base matrix. Preferably, at least about 7 v/o of the alumina based ceramic composition is tetragonal zirconia.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: September 25, 1990
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman
  • Alumina-zirconia-silicon carbide-magnesia cutting tools
    Patent number: 4959331
    Abstract: A metalcutting insert is provided with an alumina based ceramic composition composed of (in volume percent, v/o): about 1.5 to 17.5 silicon carbide whiskers; about 5 to 17.5 zirconia; residue of a magnesium oxide addition added in an amount effective to enhance the metalcutting lifetime of the cutting edge of the insert; and an alumina based matrix in which the silicon carbide whiskers, zirconia and residue of magnesium oxide are substantially homogeneously distributed. At least 4 v/o of the alumina based ceramic composition is tetragonal zirconia.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: September 25, 1990
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman
  • Whisker reinforced ceramics and a method of clad/hot isostatic pressing same
    Patent number: 4956315
    Abstract: A method of manufacturing a shaped ceramic article by hot isostatic pressing comprising the following steps: (a) forming a compact of sinterable ceramic compositions, (b) applying a coating to the compact by vapor deposition of a ceramic composition that does not become vitreous before or during the subsequent isostatic pressing step, and (c) heating and isostatically pressing the coated compacts in an atmosphere that reacts with the coating and/or the compact at pressing temperatures and pressures to cause the compact to approach theoretical density. The method is suitable for forming a fired ceramic compact having a whisker loading in excess of about 12.5 volume percent with substantially isotropic properties due to a substantially random orientation of the whiskers.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: September 11, 1990
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Joyce L. Swiokla, Elizabeth R. Billman
  • Cermet cutting tool
    Patent number: 4942097
    Abstract: A cermet cutting tool is provided having a composition containing the following: about 3.5 to about 6.5 w/o (weight percent) nickel; about 4.5 to about 7.5 w/o cobalt, wherein the sum of nickel plus cobalt is between about 8 to 11 w/o; about 20 to about 25 w/o tungsten; about 5 to about 11 w/o molybdenum; up to about 6 w/o tantalum plus niobium; up to about 0.05 w/o chromium; up to about 1 w/o aluminum; and up to about 3 w/o vanadium; with the remainder being essentially titanium, carbon, and nitrogen, wherein at least substantially all the carbon and nitrogen are present as metal compounds selected from the group consisting of metal carbonitrides and mixtures of metal carbonitrides and metal carbides where said metal is selected from the group consisting of tungsten, molybdenum, titanium, tantalum, niobium, vanadium, chromium, their solid solutions and there mixtures.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: July 17, 1990
    Assignee: Kennametal Inc.
    Inventors: Anakkavur T. Santhanam, Edward V. Conley