Patents Assigned to Davidson Equipment Leasing LLLP
  • Trench box safety ladder
    Patent number: 7530767
    Abstract: Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: May 12, 2009
    Assignee: Davidson Equipment Leasing LLLP
    Inventor: Tom Randy Davidson, Sr.
  • TRENCH BOX SAFETY LADDER
    Publication number: 20080229702
    Abstract: Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall.
    Type: Application
    Filed: August 3, 2007
    Publication date: September 25, 2008
    Applicant: Davidson Equipment Leasing LLLP
    Inventor: Tom Randy Davidson