Patents by Inventor Hugh Stewart Robertson

Hugh Stewart Robertson 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: 9297124
    Abstract: Method of handling at least one mat with the use of a crane-mounted grab head includes extending the first tooth of a first jaw of the grab head at least partially through a first hole in the mat and the first tooth of a second jaw of the grab head at least partially through a second hole in the mat. At least one actuator moves the jaws toward one another. The grab head is raised to lift the first mat. The mat is positioned at the desired location and the grab head is disengaged from the mat.
    Type: Grant
    Filed: September 13, 2015
    Date of Patent: March 29, 2016
    Inventor: Hugh Stewart Robertson
  • Publication number: 20150376846
    Abstract: Method of handling at least one mat with the use of a crane-mounted grab head includes extending the first tooth of a first jaw of the grab head at least partially through a first hole in the mat and the first tooth of a second jaw of the grab head at least partially through a second hole in the mat. At least one actuator moves the jaws toward one another. The grab head is raised to lift the first mat. The mat is positioned at the desired location and the grab head is disengaged from the mat.
    Type: Application
    Filed: September 13, 2015
    Publication date: December 31, 2015
    Inventor: Hugh Stewart Robertson
  • Patent number: 9132996
    Abstract: System for assembling a temporary surface includes a grab head and a plurality of mats configured to be placed on the ground and interconnected to form the temporary surface. The grab head includes first and second opposing jaws, each jaw having first and second spaced-apart teeth. Each tooth includes at least one flange and is engageable with one among a series of holes formed in one of the mats.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: September 15, 2015
    Assignee: Newpark Mats & Integrated Services LLC
    Inventor: Hugh Stewart Robertson
  • Publication number: 20140232127
    Abstract: A crane grab head (100) comprising a pair of jaws (102;104), a power source for moving the jaws, and a connector (116) for connecting the grab head (100) to a crane, wherein each jaw (102;104) comprises at least one tooth (110) for engaging with an object. Each jaw (102;104) is driven by a respective hydraulic/pneumatic cylinder (108a;108b)which is slideable linearly to move the jaws (102;104) between open and closed positions. The width of the grab measured between the extremities of the jaws (102;104) in the closed position is more than 1500 mm. The separation between a horizontal plane passing through the top of the uppermost cylinder (108a;108b) when the head (100) is held freely in normal use and a parallel plane passing through the lowermost edge of the lowermost tooth (110) is less than 250 mm.
    Type: Application
    Filed: February 14, 2014
    Publication date: August 21, 2014
    Inventor: Hugh Stewart Robertson