Patents by Inventor Richard T. Walter

Richard T. Walter 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).

  • Publication number: 20180069456
    Abstract: A power tool is provided including a housing and an electric motor including a stator and an armature rotatably received within the stator. The armature includes an armature shaft on which a commutator is mounted. The power tool includes a rear bearing mounted on the armature shaft adjacent the armature, and a brush assembly disposed around the commutator. The brush assembly includes a brush card, at least two brushes secured to the brush card around and in contact with the commutator, and a bridge cap extending from the brush card via legs and forming a bearing support for supporting the rearing bearing. At least one electromagnetic interference (EMI) suppression component is provided having a first terminal electrically coupled to the brush(es) and a second terminal electrically coupled to the rear bearing through the bridge cap so as to substantially ground the second terminal of the EMI suppression component.
    Type: Application
    Filed: November 8, 2017
    Publication date: March 8, 2018
    Inventors: Stephen P. Osborne, Ahmed S. Shaik, Richard T. Walter, Colin Crosby
  • Patent number: 9837878
    Abstract: A power tool is provided including a housing and an electric motor disposed within the housing, where the electric motor includes a stator and an armature rotatably received within the stator, and the armature includes an armature shaft on which a commutator is mounted. The power tool includes a brush assembly disposed around the commutator. The brush assembly includes at least two brushes in contact with the commutator and a circuit board mounted on the brush assembly and in electrical contact with the brushes. The circuit board includes at least one electromagnetic interference (EMI) suppression component electrically mounted thereon, the EMI suppression component being electrically coupled to the brushes.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: December 5, 2017
    Assignee: Black & Decker Inc.
    Inventors: Stephen P. Osborne, Ahmed S. Shaik, Richard T. Walter, Colin Crosby, Kevin Cox
  • Patent number: 9472989
    Abstract: A method of manufacturing an armature for an electric motor, includes: placing a commutator and a lamination stack on an armature shaft, winding magnet wire in slots in the lamination stacks to form coils, attaching ends of the magnet wire to the commutator, and molding plastic around the magnet wire and around the shaft of the armature at ends of the lamination stack. A spinning inertia of the armature is adjusted by adjusting at least one of a mass of the plastic molded and a distribution of the plastic molded. Alternatively and/or additionally, at least one of a resonant frequency and critical speed of the armature is adjusted by adjusting at least one of a geometry of the plastic molded, the physical properties of the plastic and the mechanical properties of the plastic.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: October 18, 2016
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Publication number: 20150303777
    Abstract: A power tool is provided including a housing and an electric motor disposed within the housing, where the electric motor includes a stator and an armature rotatably received within the stator, and the armature includes an armature shaft on which a commutator is mounted. The power tool includes a brush assembly disposed around the commutator. The brush assembly includes at least two brushes in contact with the commutator and a circuit board mounted on the brush assembly and in electrical contact with the brushes. The circuit board includes at least one electromagnetic interference (EMI) suppression component electrically mounted thereon, the EMI suppression component being electrically coupled to the brushes.
    Type: Application
    Filed: April 16, 2014
    Publication date: October 22, 2015
    Applicant: Black & Decker Inc.
    Inventors: Stephen P. Osborne, Ahmed S. Shaik, Richard T. Walter, Colin Crosby, Kevin Cox
  • Patent number: 8997332
    Abstract: A method for forming an armature for an electric motor includes: securing a lamination stack having slots therein on an armature shaft, securing a commutator on one end of the armature shaft, winding magnet wires in the slots in the lamination stack and securing ends of the magnet wires to the commutator, the magnet wires having armature lead wires that extend from the slots to the commutator; and molding plastic over the magnet wires to encase at least the armature lead wires in plastic. Alternatively and/or additionally, plastic is molded over the magnet wires to retain them in the slots and to support the armature lead wires and prevent them from vibrating when the armature rotates during operation.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: April 7, 2015
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Patent number: 8937412
    Abstract: An electric motor for a power tool includes a stator and an armature disposed in the stator. The armature includes a lamination stack having slots therein; an armature shaft extending coaxially through the lamination stack; a plurality of magnet wires wound in the slots of the lamination stack; a commutator disposed on the armature shaft to which ends of the magnet wires are electrically coupled; and thermally conductive plastic at least partially encasing the magnet wires, the thermally conductive plastic having a base polymer that is a blend of at least two polymers.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: January 20, 2015
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Publication number: 20140360008
    Abstract: A method of manufacturing an armature for an electric motor, includes: placing a commutator and a lamination stack on an armature shaft, winding magnet wire in slots in the lamination stacks to form coils, attaching ends of the magnet wire to the commutator, and molding plastic around the magnet wire and around the shaft of the armature at ends of the lamination stack. A spinning inertia of the armature is adjusted by adjusting at least one of a mass of the plastic molded and a distribution of the plastic molded. Alternatively and/or additionally, at least one of a resonant frequency and critical speed of the armature is adjusted by adjusting at least one of a geometry of the plastic molded, the physical properties of the plastic and the mechanical properties of the plastic.
    Type: Application
    Filed: August 26, 2014
    Publication date: December 11, 2014
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Patent number: 8901787
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a shaft. One of the stator or the armature includes a lamination stack having slots in which magnet wires are wound, the magnet wires having a coating of heat activated adhesive. There is further provided plastic molded around the magnet wires with heat of the plastic activating the heat activated adhesive on the magnet wires during molding of the plastic to bond the magnet wires together.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: December 2, 2014
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Patent number: 8850690
    Abstract: A method of manufacturing an armature for an electric motor, includes: placing a commutator and a lamination stack on an armature shaft, winding magnet wire in slots in the lamination stacks to form coils, attaching ends of the magnet wire to the commutator, and molding plastic around the magnet wire and around the shaft of the armature at ends of the lamination stack. A spinning inertia of the armature is adjusted by adjusting at least one of a mass of the plastic molded and a distribution of the plastic molded. Alternatively and/or additionally, at least one of a resonant frequency and critical speed of the armature is adjusted by adjusting at least one of a geometry of the plastic molded, the physical properties of the plastic and the mechanical properties of the plastic.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: October 7, 2014
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Publication number: 20130300221
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a shaft. One of the stator or the armature includes a lamination stack having slots in which magnet wires are wound, the magnet wires having a coating of heat activated adhesive. There is further provided plastic molded around the magnet wires with heat of the plastic activating the heat activated adhesive on the magnet wires during molding of the plastic to bond the magnet wires together.
    Type: Application
    Filed: November 1, 2012
    Publication date: November 14, 2013
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Publication number: 20130291371
    Abstract: A method of manufacturing an armature for an electric motor, includes: placing a commutator and a lamination stack on an armature shaft, winding magnet wire in slots in the lamination stacks to form coils, attaching ends of the magnet wire to the commutator, and molding plastic around the magnet wire and around the shaft of the armature at ends of the lamination stack. A spinning inertia of the armature is adjusted by adjusting at least one of a mass of the plastic molded and a distribution of the plastic molded. Alternatively and/or additionally, at least one of a resonant frequency and critical speed of the armature is adjusted by adjusting at least one of a geometry of the plastic molded, the physical properties of the plastic and the mechanical properties of the plastic.
    Type: Application
    Filed: November 1, 2012
    Publication date: November 7, 2013
    Inventors: Hung T. Du, Brandon L. Verbrugge, Joshua F. West, Michael R. Sell, Richard T. Walter, David J. Smith, Earl M. Ortt, John C. Stone, Howard T. White
  • Patent number: 8324764
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a lamination stack having slots in which magnet wires are wound. An armature shaft extends coaxially through the lamination stack and a commutator is disposed on the armature shaft to which ends of the magnet wires are electrically coupled. The magnet wires are at least partially encased in thermally conductive plastic. When the thermally conductive plastic is molded, a balancing feature is formed of the thermally conductive plastic. In aspects, the balancing feature can include a layer of the plastic from which plastic can be removed during balancing; one or more balancing rings adjacent axial sides of the lamination stack from which plastic can be removed to balance the armature; or one or more balancing rings having one or more pockets therein in which one or more weights are disposed to balance the armature.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: December 4, 2012
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Richard T. Walter
  • Publication number: 20120222288
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a lamination stack having slots in which magnet wires are wound. An armature shaft extends coaxially through the lamination stack and a commutator is disposed on the armature shaft to which ends of the magnet wires are electrically coupled. The magnet wires are at least partially encased in thermally conductive plastic. When the thermally conductive plastic is molded, a balancing feature is formed of the thermally conductive plastic. In aspects, the balancing feature can include a layer of the plastic from which plastic can be removed during balancing; one or more balancing rings adjacent axial sides of the lamination stack from which plastic can be removed to balance the armature; or one or more balancing rings having one or more pockets therein in which one or more weights are disposed to balance the armature.
    Type: Application
    Filed: May 16, 2012
    Publication date: September 6, 2012
    Applicant: BLACK & DECKER INC.
    Inventors: Hung T. Du, Richard T. Walter
  • Patent number: 8203239
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a lamination stack having slots in which magnet wires are wound. An armature shaft extends coaxially through the lamination stack and a commutator is disposed on the armature shaft to which ends of the magnet wires are electrically coupled. The magnet wires are at least partially encased in thermally conductive plastic. When the thermally conductive plastic is molded, a balancing feature is formed of the thermally conductive plastic. In aspects, the balancing feature can include a layer of the plastic from which plastic can be removed during balancing; one or more balancing rings adjacent axial sides of the lamination stack from which plastic can be removed to balance the armature; or one or more balancing rings having one or more pockets therein in which one or more weights are disposed to balance the armature.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: June 19, 2012
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Richard T. Walter
  • Patent number: 7990005
    Abstract: An improved power tool system includes a power tool and an external power supply connected via a cable to provide utility and safety in a hazardous operation such as loading ammunition into a weapon in an environment of flammable materials and extreme environmental exposure. The power tool includes a sparkless motor, a sparkless controller and sparkless switches, in a sealed enclosure with improved heat transfer means. The power tool has improved torque controlling means to mitigate reaction torque to the operator and equipment when starting or stopping highly inertial loads. A sealed enclosure is provided to prevent liquids from entering the motor and controller cavity and includes a thermally conductive path to conduct heat from the motor and controller through the enclosure to cooling fins and a coolant path formed between the fins and an entrapment wall.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: August 2, 2011
    Assignee: Atlas Dynamic Devices, LLC
    Inventors: Richard T. Walter, Michael L. O'Banion
  • Publication number: 20110018370
    Abstract: An electric motor has a stator in which an armature is disposed. The armature has a lamination stack having slots in which magnet wires are wound. An armature shaft extends coaxially through the lamination stack and a commutator is disposed on the armature shaft to which ends of the magnet wires are electrically coupled. The magnet wires are at least partially encased in thermally conductive plastic. When the thermally conductive plastic is molded, a balancing feature is formed of the thermally conductive plastic. In aspects, the balancing feature can include a layer of the plastic from which plastic can be removed during balancing; one or more balancing rings adjacent axial sides of the lamination stack from which plastic can be removed to balance the armature; or one or more balancing rings having one or more pockets therein in which one or more weights are disposed to balance the armature.
    Type: Application
    Filed: September 30, 2010
    Publication date: January 27, 2011
    Inventors: Hung T. Du, Richard T. Walter
  • Patent number: 7814641
    Abstract: A method of forming a power tool includes forming and balancing an armature by securing a lamination stack having slots therein on an armature shaft securing a commutator on one end of the armature shaft, winding magnet wires in the slots in the lamination stack and securing ends of the magnet wires to the commutator, and molding plastic to at least partially encase the magnet wires in plastic and forming a balancing feature. Plastic is removed from the balancing feature during dynamic balancing of the armature. The armature is then disposed in a stator to form an electric motor and the electric motor is disposed in a power tool.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: October 19, 2010
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Richard T. Walter
  • Patent number: 7685697
    Abstract: A method of manufacturing a power tool includes forming an armature by placing an electrically insulative sleeve on an armature shaft, securing a lamination stack having slots therein on the armature shaft with the insulative sleeve disposed therebetween, securing a commutator on one end of the armature shaft with the insulative sleeve disposed therebetween, winding magnet wires in the slots in the lamination stack and securing ends of the magnet wires to the commutator, and molding thermally conductive plastic to at least partially encase the magnet wires in plastic. The armature is then disposed in a stator to form an electric motor and the electric motor is disposed in a power tool. In an aspect, electrically insulative plastic is molded in the slots of the lamination stack to form slot liners and around the ends of the lamination stack to form end spiders.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: March 30, 2010
    Assignee: Black & Decker Inc.
    Inventors: Hung T. Du, Joshua F. West, Richard T. Walter
  • Patent number: 7598705
    Abstract: A system of cordless power tools includes a cordless power tool adapted to removably receive a rechargeable battery pack. The battery pack and the power tool can have complementary grooves and rails or L-shaped surfaces that aid in aligning the positive and negative blade terminals of the battery pack to the positive and negative tool terminals, respectively, of the power tool.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: October 6, 2009
    Assignee: Black & Decker Inc.
    Inventors: James B. Watson, Paul S. White, Christopher R. Yahnker, Daniel Puzio, Thomas J. Bodine, Robert Bradus, Daniele C. Brotto, John E. Buck, Daniel J. White, Sam Woods, Richard T. Walter, Edward A. Harrison, Adan Ayala
  • Patent number: 7550213
    Abstract: A tool system with a battery pack and a device that is configured to be selectively coupled to the battery pack. The battery pack has first, second and third pack terminals. The device has a battery mount with a body that defines a well and first and second device terminals. The body defines a well into which the battery pack is removably received. The first and second device terminals extend outwardly from a proximal portion of the battery mount and engage the first and second pack terminals when the battery pack is fully inserted into the well. At least one of the first and second pack terminals and the first and second device terminals is a male terminal that is received into a corresponding one of the first and second pack terminals and the first and second device terminals. A longitudinal axis of each of the first, second and third pack terminals is arranged parallel to a longitudinal axis of the battery pack.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: June 23, 2009
    Assignee: Black & Decker Inc.
    Inventors: Dale K. Wheeler, Robert G. Moores, Jr., Richard T. Walter