Patents by Inventor David W. Kratzer

David W. Kratzer 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).

  • Brake drum manufacture
    Patent number: 5345672
    Abstract: Manufacture of brake drums having an annular brake ring and a drum back for mounting the ring for rotation about an axis defined at least in part by one or more openings in the back. Radial runout of the brake ring is measured, and the mounting openings in the drum back are located at a position to substantially cancel the first harmonic of measured radial runout. The radially inwardly directed braking surface of the drum ring is then finish-machined on a cylinder of revolution coaxial with the drum back mounting openings so as to provide a brake ring of substantially uniform thickness and weight distribution about the axis of rotation defined by the drum back mounting openings.
    Type: Grant
    Filed: September 23, 1993
    Date of Patent: September 13, 1994
    Assignee: Motor Wheel Corporation
    Inventors: Richard C. Ball, Elvin E. Tuttle, David W. Kratzer
  • Process for manufacturing a vehicle brake drum
    Patent number: 5138757
    Abstract: Manufacture of brake drums having an annular brake ring and a drum back for mounting the ring for rotation about an axis defined at least in part by one or more openings in the back. Radial runout of the brake ring is measured, and the mounting openings in the drum back are located at a position to substantially cancel the first harmonic of measured radial runout. The radially inwardly directed braking surface of the drum ring is then finish-machined on a cylinder of revolution coaxial with the drum back mounting openings so as to provide a brake ring of substantially uniform thickness and weight distribution about the axis of rotation defined by the drum back mounting openings.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: August 18, 1992
    Assignee: Motor Wheel Corporation
    Inventors: Richard C. Ball, Elvin E. Tuttle, David W. Kratzer