Patents Represented by Attorney, Agent or Law Firm John J. Prizzi
  • Road milling drum assembly and method of milling
    Patent number: 5536073
    Abstract: A mining drum assembly for use in the mining of a substrate that has a drum. A plurality of bars, each one of the bars has a plurality of laterally-spaced apart mining bit assemblies connected thereto, are affixed to the surface of the drum. The bars define first and second regions of discrete bars equi-spaced about the circumference of the drum. The bars of the first region being circumferentially and laterally spaced-apart from the bars of the second region.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: July 16, 1996
    Assignees: Kennametal Inc., Advanced Cutting Systems Corp.
    Inventors: William P. Sulosky, Wayne H. Beach
  • Silicon nitride ceramic and cutting tool made thereof
    Patent number: 5525134
    Abstract: Provided is a silicon nitride based ceramic which is particularly useful for use as a cutting tool in the high speed chip forming machining of metallic materials. The ceramic is preferably composed of at least 85 volume percent (v/o) beta silicon nitride phase and less than about 5 v/o intergranular phase. The ceramic has greater than 0.2 weight percent (w/o) magnesia, greater than 0.2 w/o yttria, where the sum of magnesia and yttria is less than 5 w/o. The ceramic preferably has less than 0.2 v/o porosity.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: June 11, 1996
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Robert D. Nixon
  • Method of using a ceramic cutting tool with chip control
    Patent number: 5476025
    Abstract: A ceramic cutting insert for high speed machining of materials is provided having an integral chip control surface thereon.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: December 19, 1995
    Assignee: Kennametal Inc.
    Inventors: Craig W. Beeghly, Deepak P. Ahuja, Pankaj K. Mehrotra, Kenneth L. Niebauer
  • Rotary drill bit having an insert with leading and trailing relief portions
    Patent number: 5467837
    Abstract: A roof drill bit having a tool body with a cutting insert brazed thereto. The cutting insert has opposite leading and trailing face portions joined by a side surface which has a leading side relief portion adjacent the leading face portion and a trailing side relief portion adjacent the trailing face portion. The trailing side relief portion, which extends from the leading face portion a distance equal to between about one-third to two-thirds the thickness of the insert, has a greater relief angle that the leading side relief portion, which extends from the trailing face portion a distance equal to between about one-third to about two-thirds the thickness of the insert.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: November 21, 1995
    Assignee: Kennametal Inc.
    Inventors: Thomas R. Miller, Daniel C. Sheirer
  • Concave cutter bit
    Patent number: 5456522
    Abstract: A concave cutter bit which has a bit body that contains a concavity in the axially forward end thereof. A plurality of cutter inserts are brazed to the bit body at the periphery of the open end of the concavity. The cutter inserts are spaced-apart in such a fashion so that a gap exists between adjacent cutter inserts that is of sufficient size to prevent the formation of a continuous braze joint between any adjacent cutter inserts.
    Type: Grant
    Filed: October 14, 1991
    Date of Patent: October 10, 1995
    Assignee: Kennametal Inc.
    Inventor: Wayne H. Beach
  • Cold headed center vacuum drill bit
    Patent number: 5452628
    Abstract: A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: September 26, 1995
    Assignee: Kennametal Inc.
    Inventors: Robert H. Montgomery, Jr., Daniel C. Sheirer, James E. Elam, Paul E. Ewing
  • Agricultural disc blade
    Patent number: 5429016
    Abstract: An agricultural tool including a disc blade incorporating hard wear resistant inserts for attachment to an axial member of an agricultural tool for rotation through the soil. The disc blade includes parallel spaced flat round front and rear surfaces having a central cylindrical opening. The front surface tapers radially outwardly to the rear surface thereby defining a common outer rim having a knife edge. A plurality of notches are spaced circumferentially along the front surface of the disc blade and inwardly from the outer edge of the front surface of the disc blade. The notches are configured to receive a plurality of hard wear resistant inserts to provide improved wear resistance.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: July 4, 1995
    Assignee: Kennametal Inc.
    Inventor: Don C. Rowlett
  • Cutting bit and cutting insert
    Patent number: 5429199
    Abstract: A cutting bit useful for cutting various earth strata and the cutting insert, which may be made from a polycrystalline diamond composite, for such a cutting bit. The cutting bit has at least one pocket at the axially forward end thereof which receives its corresponding cutting insert. The cutting insert has at least one exposed cutting edge which is of an arcuate shape.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: July 4, 1995
    Assignee: Kennametal Inc.
    Inventors: Daniel C. Sheirer, Wayne H. Beach, Don C. Rowlett
  • Group IVB boride based cutting tools for machining group IVB based materials
    Patent number: 5427987
    Abstract: A densified titanium diboride based ceramic composition is provided having W and Co therein and a fine grain size. The composition has particular usefulness as a cutting tool for the machining of titanium based alloys at high speeds.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: June 27, 1995
    Assignee: Kennametal Inc.
    Inventors: Pankai K. Mehrotra, Deepak P. Ahuja, Holly S. Brooks
  • Rotatable cutting bit and bit holder
    Patent number: 5415462
    Abstract: A rotatable cutting bit for insertion into the bore of a bit holder wherein the cutting bit includes a bit body with opposite forward and rearward ends, a hard insert at the forward end of the bit body, and an enlarged mediate portion which has a rearwardly facing shoulder. The cutting bit further has a rearward shank which contains a reduced diameter portion. The cutting bit carries a rotatable sleeve on the shank whereby the sleeve surrounds the shank between the shoulder and the reduced diameter portion. The cutting bit also carries a rotatable washer on the shank adjacent the shoulder of the bit body. A keeper ring is captive within the reduced diameter portion of the shank.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: May 16, 1995
    Assignee: Kennametal Inc.
    Inventor: Ted R. Massa
  • Rotatable cutting bit assembly
    Patent number: 5400861
    Abstract: A roof drill bit assembly comprising a roof drill bit and a chuck. The roof bit contains a cavity which opens at the rearward end thereof. Upon assembling the bit and the chuck, the cavity receives the axially forward end of the chuck. A sealing member is between the roof drill bit and the chuck so as to provide a fluid-tight connection between the chuck and the roof bit.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: March 28, 1995
    Assignee: Kennametal, Inc.
    Inventor: Daniel C. Sheirer
  • Cutting tool
    Patent number: 5397370
    Abstract: A ceramic composition comprising a polycrystalline alumina matrix having titanium carbide whiskers distributed therein. The composition comprises 50 to 90 volume percent high purity alumina, 10 to 50 volume percent single crystal titanium carbide whiskers, and up to 3 volume percent being the residue of sintering aids.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: March 14, 1995
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Elizabeth R. Billman, Bernard North
  • Coated cutting tools
    Patent number: 5395680
    Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains.
    Type: Grant
    Filed: July 2, 1993
    Date of Patent: March 7, 1995
    Assignee: Kennametal Inc.
    Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
  • Silicon nitride ceramic and cutting tool made thereof
    Patent number: 5382273
    Abstract: Provided is a silicon nitride based ceramic which is particularly useful for use as a cutting tool in the high speed chip forming machining of metallic materials. The ceramic is preferably composed of at least 85 volume percent (v/o) beta silicon nitride phase and less than about 5 v/o intergranular phase. The ceramic has greater than 0.2 weight percent (w/o) magnesia, greater than 0.2 w/o yttria, where the sum of magnesia and yttria is less than 5 w/o. The ceramic has less than 0.2 v/o porosity.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: January 17, 1995
    Assignee: Kennametal Inc.
    Inventors: Pankaj K. Mehrotra, Robert D. Nixon
  • High Z sialon and cutting tools made therefrom and method of using
    Patent number: 5370716
    Abstract: A ceramic material for use as a cutting tool in the high speed machining of high temperature alloys and cast irons is provided with a composition of beta prime sialon (Si.sub.6-z Al.sub.z O.sub.z N.sub.8-2 ; where 1<Z<3) and intergranular phase. The material has high wear resistance and reliability when used in the high speed machining of high temperature alloys at speeds of 300 to 1500 surface feet per minute.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: December 6, 1994
    Assignee: Kennamental Inc.
    Inventors: Pankaj K. Mehrotra, Joyce L. Swiokla, Robert D. Nixon
  • CVD and PVD coated cutting tools
    Patent number: 5364209
    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: January 14, 1994
    Date of Patent: November 15, 1994
    Assignee: Kennametal Inc.
    Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
  • Ceramic cutting tool with chip control
    Patent number: 5350258
    Abstract: A ceramic cutting insert for high speed machining of materials is provided having an integral chip control surface thereon.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: September 27, 1994
    Assignee: Kennametal Inc.
    Inventors: Craig W. Beeghly, Deepak P. Ahuja, Pankaj K. Mehrotra, Kenneth L. Niebauer
  • Wear-resistant steel castings
    Patent number: 5337801
    Abstract: A tough, wear resistant body is provided. The body includes hard carbide particles embedded in and bonded with a first casted steel matrix material. The body may be embedded in and bonded with a second steel matrix to form a wear resistant composite. The second steel matrix has a melting point at least 200 degrees F. greater than the melting point of the first steel matrix, thereby facilitating a metallurgical bond between the surface of the wear resistant body and the second steel matrix. The composite structure is particularly suitable for earthmoving and other severe mechanical applications.
    Type: Grant
    Filed: May 1, 1991
    Date of Patent: August 16, 1994
    Assignee: Kennametal Inc.
    Inventor: James P. Materkowski
  • Ceramic cutting tool with chip control
    Patent number: 5330296
    Abstract: A ceramic cutting insert for high speed machining of materials is provided having an integral chip control surface thereon.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: July 19, 1994
    Assignee: Kennametal Inc.
    Inventors: Craig W. Beeghly, Deepak P. Ahuja, Pankaj K. Mehrotra, Kenneth L. Niebauer
  • Spray powder for hardfacing and part with hardfacing
    Patent number: 5328763
    Abstract: A spray powder for thermal spraying onto a substrate to provide a hardfacing, and a part with such hardfacing on the surface thereof, that is corrosion-resistant and abrasion-resistant. The spray powder comprises between about 75 to about 90 weight percent of tungsten carbide. The powder further comprises between about 10 and 25 weight percent of a nickel-based alloy, which includes Mo, and optionally, includes one or more of Fe, C, Cr, Mn, Co, Si and W.
    Type: Grant
    Filed: February 3, 1993
    Date of Patent: July 12, 1994
    Assignee: Kennametal Inc.
    Inventor: Charles J. Terry