Patents by Inventor Donald L. Hufnagle

Donald L. Hufnagle 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).

  • Self-detenting transmission shift key
    Patent number: 5109722
    Abstract: A variable speed, draw key transmission having a number of gears of different gear ratios rotatably journalled on a shaft. The shaft includes a keyway containing a slidable key that may be selectively moved between the gears to change the output speed of the transmission. The key includes a bump and the keyway a series of notches forming a detent for indicating to the operator the gear engaging positions of the key.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: May 5, 1992
    Assignee: The Toro Company
    Inventors: Donald L. Hufnagle, Steven J. Svoboda