Patents by Inventor James R. Bernhagen

James R. Bernhagen 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).

  • Patent number: 7210356
    Abstract: A portable physical agents directive (PAD) dosimeter system may be provided. The portable PAD dosimeter system may include a housing and at least one accelerometer configured to generate electrical signals corresponding to a vibration exposure of an operator of a work machine. The portable PAD dosimeter system may also include a controller disposed in the housing configured to process the electrical signals and to determine whether the vibration exposure is above a predetermined threshold.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: May 1, 2007
    Assignee: Caterpillar Inc
    Inventor: James R. Bernhagen
  • Patent number: 4700794
    Abstract: An improved mechanical-over-hydraulic steering apparatus capable of providing automotive-type steering includes a steering wheel driven input control member, right and left turn control valves, and first and second actuators mounted for rotation along an axis common with the input control member. Each of the actuators has a cam operatively associated with a cam-following roller assembly that operates the respective control valve. The vehicle has a cross drive mechanism, and the steering apparatus includes an over-center variable displacement steering pump and associated displacement control controllably operated by first and second pilot lines connected to the right and left turn control valves. The steering pump controllably and bidirectionally communicates fluid to a steering motor for the steering input to the cross drive mechanism.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: October 20, 1987
    Assignee: Caterpillar Inc.
    Inventors: James R. Bernhagen, Elmer R. Crabb, Marilyn S. Murphy, Daniel G. Roley, Gene R. St. Germain, James H. Tunnell
  • Patent number: 4343563
    Abstract: A first member (7) with a tapered spline (6) and a method of making same, which tapered spline (6) provides an improved backlash-free mating with a second member (10) having a conventional straight spline (9). The method of forming the spline (6) consists of distorting a first member (7) along its central axis (14), broaching the first member (7) to form a straight cylindrical spline, and returning the first member (7) to its undistorted condition whereby the straight spline becomes a tapered spline (6).
    Type: Grant
    Filed: May 16, 1980
    Date of Patent: August 10, 1982
    Assignee: Caterpillar Tractor Co.
    Inventor: James R. Bernhagen