Patents Assigned to James Howden & Co. Ltd.
  • Seal assembly
    Patent number: 5217235
    Abstract: A sealing assembly between first and second relatively rotatable parts, such as the parts of a tunnel boring machine, in which a flange on a first part has a radial sealing face engaged by the axial faces of inner and outer sealing rings mounted on the body portion of the second part at radially spaced locations, a bleed passage in the second body portion opening between the sealing rings and indicating any failure in the outer sealing ring.
    Type: Grant
    Filed: April 22, 1992
    Date of Patent: June 8, 1993
    Assignees: James Howden & Co. Ltd., Greene, Tweed & Co., Ltd.
    Inventors: Robert A. Walker, Anthony W. Porter