Patents by Inventor John Haeg

John Haeg 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).

  • Linear actuator control structure
    Patent number: 6614195
    Abstract: A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating a drive signal and a force request signal representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: September 2, 2003
    Assignee: Tennant Company
    Inventors: Bruce Bushey, Robert Erko, John Haeg, Richard Milun, Terry Schwartz
  • Linear actuator control structure
    Publication number: 20010054533
    Abstract: A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating a drive signal and a force request signal representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.
    Type: Application
    Filed: May 9, 2001
    Publication date: December 27, 2001
    Inventors: Bruce Bushey, Robert Erko, John Haeg, Richard Milun, Terry Schwartz
  • Linear actuator control structure
    Patent number: RE41036
    Abstract: A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating a drive signal and a force request signal representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: December 15, 2009
    Assignee: Tennant Company
    Inventors: Bruce Bushey, Terry Schwartz, Richard Milun, Robert Erko, John Haeg