Patents by Inventor Murray W. Calderwood

Murray W. Calderwood 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: 4447739
    Abstract: Apparatus for withdrawing the rotor from the stator in a bulb-type generator makes the rotor and the inner portion of the stator accessible for repair or maintenance without having to disassemble the housing and stator. A pair of detachable beams are placed in the housing when the rotor is stationary so they extend through holes provided in the rotor above the shaft on which the rotor turns. The beams are conveniently mounted to the upper stay tower structure at their downstream end, and to the housing at their upstream end. An additional support member may be used between the beams and the bottom of the housing at the upstream end of the beams. Shoes which slidably engage the beam are placed between the beam and the rotor to support the rotor. Preferably the shoes include a hydraulically operated piston which can be extended to ensure positive engagement with the beam. The rotor has an inner ring which is bolted to a driving disc on the shaft.
    Type: Grant
    Filed: April 27, 1982
    Date of Patent: May 8, 1984
    Assignee: Canadian General Electric Company Limited
    Inventors: James H. Ferguson, Murray W. Calderwood