Patents by Inventor Thomas C. Onsrud

Thomas C. Onsrud 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).

  • Drive belt tension control apparatus for inverted rooter
    Patent number: 4893661
    Abstract: An inverted router characterized by having a drive motor, a motor driven pulley, a spindle drive pulley and a drive belt for transferring power from the motor driven pulley to the spindle and drive belt tension control apparatus. The drive belt tension control apparatus comprises a mounting plate for mounting the motor driven pulley in variable spaced-apart relation to the spindle drive pulley and a pneumatic cylinder and piston assembly for exerting a predetermined pressure on the motor drive pulley and thereby a predetermined tension on the drive belt.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: January 16, 1990
    Assignee: C. R. Onsrud, Inc.
    Inventor: Thomas C. Onsrud