Patents by Inventor David Michael O'Brien

David Michael O'Brien 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).

  • Tool coupler
    Patent number: 6991398
    Abstract: A tool coupler comprises a coupler frame and an attachment frame. The attachment frame is provided with two hooks that engage two catches located on the coupler frame. The coupler frame is provided with two locking pins and the attachment frame is provided with two receiving apertures, for locking the coupler frame to the attachment frame. Both locking pins are actuated by a double acting hydraulic cylinder. The hydraulic cylinder is slidably mounted on the coupler frame. The hydraulic cylinder is provided with a barrel end having the first locking pin and a piston rod having the second locking pin. The coupler frame and the hydraulic cylinder are provided with limiters which limit the sliding movement the piston rod and the barrel end relative to the coupler frame.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: January 31, 2006
    Assignee: Deere & Company
    Inventors: Ronald Anthony Leemans, David Michael O'Brien, George Robertson, Gregory Keith Werner
  • Loader linkage
    Patent number: 6957705
    Abstract: A Z-bar loader linkage having a floating bell crank. A boom is pivotally mounted to a loader frame at one end and an attachment at the other end. The bell crank is pivotally mounted on leveling links extending forwardly from the loader frame. The drive end of the bell crank is provided with an attachment link that extends from the bell crank to the attachment for controlling the angular position of the attachment. A guide link extends between the attachment link and the boom.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: October 25, 2005
    Assignee: Deere & Company
    Inventors: David Michael O'Brien, Gregory Keith Werner, Michael Dean Worley, George Madsen Robertson, Dusan John Hvolka
  • Tool coupler
    Publication number: 20040247382
    Abstract: A tool coupler comprises a coupler frame and an attachment frame. The attachment frame is provided with two hooks that engage two catches located on the coupler frame. The coupler frame is provided with two locking pins and the attachment frame is provided with two receiving apertures, for locking the coupler frame to the attachment frame. Both locking pins are actuated by a double acting hydraulic cylinder. The hydraulic cylinder is slidably mounted on the coupler frame. The hydraulic cylinder is provided with a barrel end having the first locking pin and a piston rod having the second locking pin. The coupler frame and the hydraulic cylinder are provided with limiters which limit the sliding movement the piston rod and the barrel end relative to the coupler frame.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 9, 2004
    Applicant: Deere & Company, a Delaware corporation
    Inventors: Ronald Anthony Leemans, David Michael O'Brien, George Robertson, Gregory Keith Werner