Patents by Inventor Don C. Rowlett

Don C. Rowlett has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9585313
    Abstract: A stump cutter assembly that has a driven wheel with first and wheel side surfaces, and a first stump cutter tooth assembly operatively attaches to the first wheel side surface and a second stump cutter tooth assembly operatively attaches to the second wheel side surface. The first stump cutter tooth assembly includes a first stump cutter tooth and a first bi-directional pocket member that non-rotatably retains the first stump cutter tooth. The second stump cutter tooth assembly includes a second stump cutter tooth and a second bi-directional pocket member that non-rotatably retains the second stump cutter tooth. The first stump cutter tooth assembly is in general transverse alignment with the second stump cutter tooth assembly.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: March 7, 2017
    Inventors: Gary W. Kappel, Thomas R. Lyng, Cary D. Ritchey, Don C. Rowlett
  • Patent number: 9428968
    Abstract: A rotary drill bit for engaging an earth strata material includes an elongate drill bit body having an axial forward end and an axial rearward end, and a cutting insert attached to the axial forward end of the elongate drill bit body. The cutting insert has an elongate insert body rotatable about a central axis and includes a pair of symmetrical halves symmetrical about the central axis, each symmetrical half including a leading face, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface and a cutting edge formed at the intersection of the T-land surface and the relief surface. The cutting edge can have a negative axial rake angle. The relief surface can include a primary relief surface and a secondary relief surface.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: August 30, 2016
    Assignee: KENNAMETAL INC.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Patent number: 9347276
    Abstract: A two-prong rotary drill bit for engaging an earth strata material includes a drill bit body having an axis of rotation, the drill bit body having a head portion at an axial forward end and a shank portion at an axial rearward end, the head portion having two mounting arms offset from the axis of rotation of the drill bit body. The two-prong rotary drill bit also includes a cutting insert attached to each mounting arm at the axial forward end of the drill bit body. Each cutting insert includes a leading face facing in the direction of rotation, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: May 24, 2016
    Assignee: KENNAMETAL INC.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Patent number: 9303511
    Abstract: A flat cutter bit for engaging an earth strata material includes a non-rotatable shank portion, a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having an angled leading face, a top surface having a relief surface, a T-land surface extending between the angled leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: April 5, 2016
    Assignee: KENNAMETAL INC.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20140319898
    Abstract: A radial cutter bit includes a non-rotatable shank portion, a head portion including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having a leading face, an opposing trailing face, a first side and a second side. The leading face has a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body. The cutting insert further includes a top surface having a relief surface, a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: Kennametal Inc.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20140319261
    Abstract: A stump grinding cutter bit includes a non-rotatable shank portion, a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes: a body having a top surface, a leading face, an opposing trailing face, a first side and a second side; a T-land surface extending between the leading face and the top surface and extending between the leading face and the first side and second side; and a cutting edge formed at the intersection of the T-land surface and the top surface and at the intersection of the T-land surface and the first side and the second side.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: Kennametal Inc.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20140319897
    Abstract: A flat cutter bit for engaging an earth strata material includes a non-rotatable shank portion, a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having an angled leading face, a top surface having a relief surface, a T-land surface extending between the angled leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: Kennametal Inc.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20140318871
    Abstract: A rotary drill bit for engaging an earth strata material includes an elongate drill bit body having an axial forward end and an axial rearward end, and a cutting insert attached to the axial forward end of the elongate drill bit body. The cutting insert has an elongate insert body rotatable about a central axis and includes a pair of symmetrical halves symmetrical about the central axis, each symmetrical half including a leading face, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface and a cutting edge formed at the intersection of the T-land surface and the relief surface. The cutting edge can have a negative axial rake angle. The relief surface can include a primary relief surface and a secondary relief surface.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: Kennametal Inc.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20140318872
    Abstract: A two-prong rotary drill bit for engaging an earth strata material includes a drill bit body having an axis of rotation, the drill bit body having a head portion at an axial forward end and a shank portion at an axial rearward end, the head portion having two mounting arms offset from the axis of rotation of the drill bit body. The two-prong rotary drill bit also includes a cutting insert attached to each mounting arm at the axial forward end of the drill bit body. Each cutting insert includes a leading face facing in the direction of rotation, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: Kennametal Inc.
    Inventors: Nicholas J. Paros, Stephen M. George, Glenn W. Sheffler, Don C. Rowlett
  • Publication number: 20130300183
    Abstract: A rotatable cutting tool for use in impinging earth strata includes a cutting tool body having a central longitudinal axis, the cutting tool body including a head portion, a shank portion axially rearward of the head portion and a hard cutting tip affixed to the head portion of the cutting tool body. The head portion includes a first head section adjacent to an axial forward end of the head portion, wherein the first head section includes a plurality of first side faces such that adjacent first side faces meet to form a corresponding plurality of first common edges. The head portion further includes a second head section adjacent to an axial rearward end of the head portion, the second head section having a plurality of second side faces wherein adjacent second side faces meet to form a corresponding plurality of second common edges.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 14, 2013
    Applicant: KENNAMETAL INC.
    Inventors: Don C. Rowlett, Randall W. Ojanen
  • Patent number: 8522843
    Abstract: A bi-directional pocket member that retains a stump cutter tooth. The pocket affixes to a selected wheel side surface of a driven wheel, which has a first wheel side surface and a second wheel side surface. The pocket member has a pocket body, which has a first pocket edge, a second pocket edge, a first pocket side surface, a second pocket side surface, a radial inward pocket portion and an integral radial outward pocket portion. The radial inward pocket portion contains attachment bores used to operatively attach the pocket member to the driven wheel. The radial outward portion contains a retention bore used to retain the stump cutter tooth.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: September 3, 2013
    Assignees: Kennametal Inc., Vermeer Manufacturing Company
    Inventors: Gary W Kappel, Thomas R Lyng, Cary D Ritchey, Don C Rowlett
  • Publication number: 20130026810
    Abstract: A cutting tool assembly for use in impinging earth strata includes a holder containing a bore having an axial forward end, and the holder having a forward surface surrounding the bore at the axial forward end of the bore. The assembly also includes a cutting tool being rotatably contained within the bore of the holder, and the cutting tool having a rearwardly facing shoulder. The assembly further includes a protective member positionable between the cutting tool and the holder. The protective member has a first surface adjacent the rearwardly facing shoulder of the cutting tool and a second surface adjacent to the forward surface of the holder, wherein the first surface has a first hardness that is greater than a second hardness of the second surface. In one aspect, the second surface of the protective member is in direct contact with the forward surface of the holder. In another aspect, the first surface of the protective member is in direct contact with the rearwardly facing shoulder of the cutting tool.
    Type: Application
    Filed: July 25, 2011
    Publication date: January 31, 2013
    Applicant: KENNAMETAL INC.
    Inventors: Randall Walter Ojanen, Don C. Rowlett
  • Publication number: 20120012229
    Abstract: A stump cutter assembly that has a driven wheel with first and wheel side surfaces, and a first stump cutter tooth assembly operatively attaches to the first wheel side surface and a second stump cutter tooth assembly operatively attaches to the second wheel side surface. The first stump cutter tooth assembly includes a first stump cutter tooth and a first bi-directional pocket member that non-rotatably retains the first stump cutter tooth. The second stump cutter tooth assembly includes a second stump cutter tooth and a second bi-directional pocket member that non-rotatably retains the second stump cutter tooth. The first stump cutter tooth assembly is in general transverse alignment with the second stump cutter tooth assembly.
    Type: Application
    Filed: August 16, 2011
    Publication date: January 19, 2012
    Applicants: Vermeer Manufacturing Company, Kennametal Inc.
    Inventors: Gary W. Kappel, Thomas R. Lyng, Cary D. Ritchey, Don C. Rowlett
  • Patent number: 8061783
    Abstract: A block and non-rotating wear sleeve for holding a cutting tool used with mining and construction is disclosed. A key is used to intersect with notches in the wear sleeve and block at a rear face of the wear sleeve and block to prevent rotational movement between the wear sleeve and block. Locating the key and notches at the rear face provides an easily manufactured anti-rotation means which is also sheltered from the most of the abrasion experienced by the block and wear sleeve.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: November 22, 2011
    Assignee: Kennametal Inc.
    Inventors: Donald E. Keller, Don C. Rowlett
  • Patent number: 8020591
    Abstract: A stump cutter tooth held by a pocket member, which has first and second edge, and the pocket member being operatively attached to a driven wheel, which has opposite first and second side surfaces. The stump cutter tooth includes an elongate tooth body that has an axial forward end. A first hard region is at the axial forward end of the tooth body and defines at least one distinct cutting edge that has an orientation to engage the stump during operation. A second hard region is at the axial forward end of the tooth body and is distinct from the first hard region. The second hard region provides protection to at least a portion of the pocket member.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: September 20, 2011
    Assignees: Kennametal Inc., Vermeer Manufacturing Company
    Inventors: Gary W. Kappel, Thomas R. Lyng, Cary D. Ritchey, Don C. Rowlett
  • Patent number: 8016219
    Abstract: A wear component for use in an impact crusher having a forward depression on the face of the wear component which is exposed to aggregate wear. Wear resistant inserts, for example cemented tungsten carbide inserts, are bonded within the forward depression to prevent rapid abrasion of the wear component. Joints are formed between wear resistant inserts and joints are also formed between wear resistant inserts and the wear component. Bonding material fills the joints to further secure the wear resistant inserts and to prevent crack propagation.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: September 13, 2011
    Assignee: Kennametal Inc.
    Inventors: Gary John Condon, Don C. Rowlett
  • Publication number: 20110162756
    Abstract: A bi-directional pocket member that retains a stump cutter tooth. The pocket affixes to a selected wheel side surface of a driven wheel, which has a first wheel side surface and a second wheel side surface. The pocket member has a pocket body, which has a first pocket edge, a second pocket edge, a first pocket side surface, a second pocket side surface, a radial inward pocket portion and an integral radial outward pocket portion. The radial inward pocket portion contains attachment bores used to operatively attach the pocket member to the driven wheel. The radial outward portion contains a retention bore used to retain the stump cutter tooth.
    Type: Application
    Filed: March 15, 2011
    Publication date: July 7, 2011
    Applicant: Kennametal Inc.
    Inventors: Gary W. Kappel, Thomas R. Lyng, Cary D. Ritchey, Don C. Rowlett
  • Patent number: 7959234
    Abstract: A rotatable cutting tool that is useful for impingement upon a substrate and is adapted to be rotatably retained within the bore of a holder. The rotatable cutting tool includes an elongate cutting tool body, which has an axial forward end and an axial rearward end, as well as a socket at the axial forward end thereof. The rotatable cutting tool also includes a hard cutting member that is affixed to the cutting tool body within the socket. The hard cutting member has an axial forward end and an axial rearward end. The hard cutting member has a superhard axial forward portion at the axial forward end thereof wherein the superhard axial forward portion has a maximum transverse dimension. The hard cutting member further has a hard axial rearward portion contiguous with and axial rearward of the superhard axial forward portion. The hard axial rearward portion has a maximum transverse dimension.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: June 14, 2011
    Assignee: Kennametal Inc.
    Inventors: Vernon B. Cameron, Don C. Rowlett, Randall W. Ojanen
  • Publication number: 20110114774
    Abstract: A wear component for use in an impact crusher having a forward depression on the face of the wear component which is exposed to aggregate wear. Wear resistant inserts, for example cemented tungsten carbide inserts, are bonded within the forward depression to prevent rapid abrasion of the wear component. Joints are formed between wear resistant inserts and joints are also formed between wear resistant inserts and the wear component. Bonding material fills the joints to further secure the wear resistant inserts and to prevent crack propagation.
    Type: Application
    Filed: January 25, 2011
    Publication date: May 19, 2011
    Applicant: KENNAMETAL INC.
    Inventors: Gary John Condon, Don C. Rowlett
  • Patent number: 7909279
    Abstract: A wear component for use in an impact crusher having a forward depression on the face of the wear component which is exposed to aggregate wear. Wear resistant inserts, for example cemented tungsten carbide inserts, are bonded within the forward depression to prevent rapid abrasion of the wear component. Joints are formed between wear resistant inserts and joints are also formed between wear resistant inserts and the wear component. Bonding material fills the joints to further secure the wear resistant inserts and to prevent crack propagation.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: March 22, 2011
    Assignee: Kennametal Inc.
    Inventors: Gary John Condon, Don C. Rowlett