Patents by Inventor Karl H. Haas

Karl H. Haas 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).

  • Hydraulic steering device
    Patent number: 4789036
    Abstract: The invention relates to a hydraulic control system for changing the speed and direction of a hydraulically operated tracked vehicle (1). The hydraulic control system is equipped with a feed pump (34) for the control fluid and with hydraulic undercarriage pumps (12) and (13). The undercarriage pumps (12) and (13) comprise regulating cylinders (18) and (19) subjected to the control fluid and intended for adjusting the pump pivoting angle. The regulating cylinders (18) and (19) are each equipped with two regulating-cylinder chambers (26, 28) and 25, 27) separated from one another by a regulating piston (22) and (23).
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: December 6, 1988
    Assignee: Karl Kassbohrer Fahrzeugwerke GmbH
    Inventor: Karl H. Haas