Patents by Inventor David A. Dull

David A. Dull 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: 9010876
    Abstract: A spindle assembly includes a main housing, a spindle mounted for rotation within the housing, a wheel hub attached to the spindle, a coupling located adjacent to an inner end of the spindle, and a disconnect shaft located within a bore of the coupling. The disconnect shaft is moveable in an axial direction between an engaged position in which a splined portion of the disconnect shaft mates with splined portions of both the spindle and the coupling to prevent the spindle from rotating independently of the coupling, and a disengaged position that allows the spindle to free-wheel relative to the coupling. A sprocket or gear is connected to an inner end of the coupling to connect the spindle assembly to a drive motor. An actuator is connected to an inner end of the disconnect shaft to move the shaft between its engaged and disengaged positions.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: April 21, 2015
    Assignee: Allis-Roller LLC
    Inventors: Anthony J. Stelter, David A. Dull
  • Publication number: 20120326489
    Abstract: A spindle assembly includes a main housing, a spindle mounted for rotation within the housing, a wheel hub attached to the spindle, a coupling located adjacent to an inner end of the spindle, and a disconnect shaft located within a bore of the coupling. The disconnect shaft is moveable in an axial direction between an engaged position in which a splined portion of the disconnect shaft mates with splined portions of both the spindle and the coupling to prevent the spindle from rotating independently of the coupling, and a disengaged position that allows the spindle to free-wheel relative to the coupling. A sprocket or gear is connected to an inner end of the coupling to connect the spindle assembly to a drive motor. An actuator is connected to an inner end of the disconnect shaft to move the shaft between its engaged and disengaged positions.
    Type: Application
    Filed: June 22, 2012
    Publication date: December 27, 2012
    Inventors: ANTHONY J. STELTER, David A. Dull
  • Patent number: 4766727
    Abstract: A fluid control valve for controlling the flow of hydraulic fluid at a high pressure from a primary pump and the flow of the hydraulic fluid at a low charge pressure from a charge pump to cam-lobe type hydraulic motors which are used to assist in driving a vehicle. When energizing the motors, charge pressure is first delivered to the motors. Thereafter, all of the supply and return lines leading to the motors and to the primary pump and the charge pump are connected together to further increase the pressure delivered to the motors. Finally, the charge pressure line is disconnected and the supply and return lines leading to the motors are connected to the high pressure supply and return lines leading to the primary pump. When the supply and return lines leading to the motors are disconnected from the primary pump, the lines leading to the motors are drained into a reservoir. An accumulator is provided within the motors to absorb sudden pressure delivered thereto.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: August 30, 1988
    Assignee: Dyneer Corporation
    Inventors: David A. Dull, Richard K. Taden