Patents by Inventor David Mildren

David Mildren 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).

  • Locking mechanism for a ground drill
    Patent number: 8720606
    Abstract: A locking mechanism for locking an insertable device relative to an outer tube of a ground drill comprises at least one latch, which is arranged to releasably retain the insertable device in a substantially fixed axial position relative to the outer tube. The locking mechanism comprises a cam and a cam follower, which are arranged to control a radial position of the latch. The locking system may be used in a ground drill system.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: May 13, 2014
    Assignee: Sandvik Intellectual Property AB
    Inventors: David Mildren, Cameron Westwood
  • LOCKING MECHANISM FOR A GROUND DRILL
    Publication number: 20110100719
    Abstract: A locking mechanism for locking an insertable device relative to an outer tube of a ground drill comprises at least one latch, which is arranged to releasably retain the insertable device in a substantially fixed axial position relative to the outer tube. The locking mechanism comprises a cam and a cam follower, which are arranged to control a radial position of the latch. The locking system may be used in a ground drill system.
    Type: Application
    Filed: February 17, 2009
    Publication date: May 5, 2011
    Inventors: David Mildren, Cameron Westwood
  • Screw thread structure for percussion drill driver sub and case
    Patent number: 5163523
    Abstract: A driver sub and a case for enclosing a piston chamber of a percussion drill are threadedly connected by respective identical male and female screw threads. Each of the identical male and female screw threads includes a root portion, the shape of which is defined by portions of two axially overlapping ellipses interconnected by a flat.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: November 17, 1992
    Assignee: Sandvik Rock Tools, Inc.
    Inventors: Faisal J. Yousef, Robert F. Kane, Joel Ham, David Mildren
  • Screw thread coupling
    Patent number: 5060740
    Abstract: A thread coupling comprises two interconnected screw threads. Each of the screw threads has a root portion shaped as a portion of an ellipse. With respect to one of the threads having such a shape, the major axis of the ellipse is longer than that of the other thread.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: October 29, 1991
    Assignee: Sandvik Rock Tools, Inc.
    Inventors: Faisal J. Yousef, Robert F. Kane, Joel Ham, David Mildren
  • Screw thread structure
    Patent number: 5056611
    Abstract: A screw thread structure includes a root portion, the shape of which is defined by portions of two axially overlapping ellipses interconnected by a flat.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: October 15, 1991
    Assignee: Galloway Trust
    Inventors: Faisal J. Yousef, Robert F. Kane, Joel Ham, David Mildren