Patents by Inventor Haruhisa Chijiiwa

Haruhisa Chijiiwa 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).

  • Fan blade axial retention device
    Patent number: 5112193
    Abstract: A fan blade retention device includes a collar (13) inserted into a circumferential groove (14) cut into the hub (6) of a turbofan engine. The outward facing groove (14) is positioned aft of the fan blade fixing channel (15). When the fan blade root (11) is completely received within the blade fixing channel (15), the blade root (11) contacts the collar (13) and is prevented from traveling further aft. If the collar 13 is segmented, an annular rear cover plate (19) holds the segmented collar (13) radially within the groove (14).
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: May 12, 1992
    Assignee: Pratt & Whitney Canada
    Inventors: John Greer, Haruhisa Chijiiwa, Michael J. Dowhan