Patents Represented by Attorney Robert H. Hubbard

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  • Empty-load valve device
    Patent number: 4844554
    Abstract: An empty-load valve device has a single housing competing coaxially a load sensing push rod, a load sensing piston, a ratio piston, a ratio valve and a spring for retracting the push rod to a normal position. The load sensing push rod actuates the ratio piston to open an equalizing valve to fill an equalizing volume from a control valve and to permit the ratio piston to limit brake cylinder pressure upon sensing an empty car.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: July 4, 1989
    Assignee: General Signal Corporation
    Inventor: Walter E. Rojecki