Patents by Inventor Dirk Tol

Dirk Tol 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).

  • Arrangement to obtain equal travel of hydraulic cylinders
    Patent number: 4230304
    Abstract: The invention relates to an arrangement to obtain an equal travel of hydraulic cylinders, particularly on behalf of a hydraulic car lift hauling at least two single acting lifting cylinders, powered by a common pressure source and with which a lifting platform can be moved which is maintained in a substantially horizontal position by means of the equal-travel arrangement, to which end both cylinders are connected to a control arrangement which itself is controlled by a leveling arrangement which is influenced by the position of the platform.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: October 28, 1980
    Assignee: ITT Industries, Inc.
    Inventor: Dirk Tol