Patent ID: 8887413
Filing Date: 2014-11-18
Classification: E01H,E02F

Abstract:
1. A material box assembly comprising: a center blade assembly having a center main blade, said main blade having a curved plate structure, said center main blade has a plurality of generally vertically arranged center gussets which are laterally spaced apart from each other, said center main blade having an absence of said center gussets at each lateral end of said center main blade; a channel directly attached to a back side of and extending a full width of the curved plate structure of the center main blade so as to define an integral structural support for the center blade assembly, said channel having a C-shaped cross sectional shape with a pair of opposed lips engaging and attached to the curved plate structure, each of said lips extending toward its opposing lip, said channel and the back side of said center main blade defining a first gap therebetween at each lateral end of said channel; and at least one wing blade assembly having a wing blade, wherein said at least one wing blade assembly includes a wing blade slide that is slidably engaged only with the channel and not the main blade to adjust the width of the material box, each said wing blade slide and a back of said corresponding wing blade defining a second gap therebetween, whereby said wing blade is slidable in transverse directions within said first gap at the back side of the center main blade, each said wing blade slide having a cross sectional shape which mates with and slides within said C-shaped cross sectional shape of a corresponding said channel, each said wing blade being positioned behind said center main blade and having a curvature that mates with the back side of the center main blade and allows transverse sliding of the wing blade relative to the center main blade.