Patents by Inventor Alvin A. Liebel

Alvin A. Liebel 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: 8392075
    Abstract: A power machine includes a carrier comprising a supporting frame, an operator compartment and a joystick controller disposed in the operator compartment and configured to generate movement signals in response to operator movement of the joystick controller. An attachment is detachably coupled to the power machine. A carrier control unit is disposed on the carrier and configured to receive the movement signals from the joystick controller. An attachment control unit is disposed on the attachment and configured to control movement of the attachment. A network is coupled to the carrier control unit and to the attachment control unit and is configured to carry instructions from the carrier control unit to the attachment control unit. A state selection input is disposed in the operator compartment to select one of at least two operational states including a carrier state and an attachment state.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: March 5, 2013
    Assignee: Clark Equipment Company
    Inventors: Spencer L. Mindeman, Doran D. Hirschkorn, Christopher W. Lougheed, Phillip D. Bogner, Alvin A. Liebel
  • Patent number: 8037680
    Abstract: A hydraulic control system for a swiveling construction machine includes at least one hydraulic travel motor, a first hydraulic actuation device, a second hydraulic actuation device and a hydraulic diverter valve assembly. The at least one hydraulic travel motor is configured to move the swiveling construction machine in a first travel speed and a second travel speed based on a variable pilot pressure signal. The first hydraulic actuation device is configured to actuate a first function of an implement. The second hydraulic actuation device is configured to actuate a second function of an implement. The hydraulic diverter valve assembly is configured to divert hydraulic power between the first hydraulic actuation device and the second hydraulic actuation device while maintaining operation of the at least one hydraulic travel motor in one of the first and the second speeds.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: October 18, 2011
    Assignee: Clark Equipment Company
    Inventors: James M. Breuer, Michael D. Wetzel, Alvin A. Liebel
  • Publication number: 20090216412
    Abstract: A power machine includes a carrier comprising a supporting frame, an operator compartment and a joystick controller disposed in the operator compartment and configured to generate movement signals in response to operator movement of the joystick controller. An attachment is detachably coupled to the power machine. A carrier control unit is disposed on the carrier and configured to receive the movement signals from the joystick controller. An attachment control unit is disposed on the attachment and configured to control movement of the attachment. A network is coupled to the carrier control unit and to the attachment control unit and is configured to carry instructions from the carrier control unit to the attachment control unit. A state selection input is disposed in the operator compartment to select one of at least two operational states including a carrier state and an attachment state.
    Type: Application
    Filed: February 24, 2009
    Publication date: August 27, 2009
    Applicant: Clark Equipment Company
    Inventors: Spencer L. Mindeman, Doran D. Hirschkorn, Christopher W. Lougheed, Phillip D. Bogner, Alvin A. Liebel
  • Publication number: 20090044434
    Abstract: A hydraulic control system for a swiveling construction machine includes at least one hydraulic travel motor, a first hydraulic actuation device, a second hydraulic actuation device and a hydraulic diverter valve assembly. The at least one hydraulic travel motor is configured to move the swiveling construction machine in a first travel speed and a second travel speed based on a variable pilot pressure signal. The first hydraulic actuation device is configured to actuate a first function of an implement. The second hydraulic actuation device is configured to actuate a second function of an implement. The hydraulic diverter valve assembly is configured to divert hydraulic power between the first hydraulic actuation device and the second hydraulic actuation device while maintaining operation of the at least one hydraulic travel motor in one of the first and the second speeds.
    Type: Application
    Filed: August 13, 2008
    Publication date: February 19, 2009
    Applicant: CLARK EQUIPMENT COMPANY
    Inventors: James M. Breuer, Michael D. Wetzel, Alvin A. Liebel