Patent ID: 9011037
Filing Date: 2015-04-21
Classification: E01C

Abstract:
1. A mat with an upper road side, a center of gravity, and a lower ground contacting side, the mat comprising: a frame comprising beams that form a grid and retain one or more boards between the beams, the beams comprising interior and exterior beams, the frame having a perimeter defined by the exterior beams, with four interior beams connected together to define an interior portion of the mat, the interior portion bounded by the four interior beams; and a grapple receiver secured by the four interior beams, formed in the interior portion of the mat and spaced from the perimeter, the grapple receiver being indented from one or both of the upper road side and the lower ground contacting side to have a thickness, measured perpendicularly to the upper road side and the lower ground contacting side, that has a minimum at the center of gravity of the mat, to allow grapple jaws to grip and hold the grapple receiver between the grapple jaws.