Patent ID: 8876216

Claim:
A dump trailer comprising: a first frame, the first frame bearing one or more sets of wheels; a second frame, the second frame comprising an attachment device to permit coupling to a towing vehicle; a third frame positioned above the first and second frames and providing support for a trailer bed; horizontal displacement means for permitting horizontal forward and rearward movement of the second frame relative to the first frame, wherein the horizontal displacement means contacts the first frame and the second frame; pivoting means for providing a pivot point for the third frame as the second frame moves horizontally forward and rearward relative to the first frame; one or more rear torque arms, wherein the one or more rear torque arms cause the third frame to pivot about the pivoting means as the second frame moves forward and rearward relative to the first frame; wherein the first, second and third frames comprise one or more longitudinal support beams; wherein the second frame is positioned between the first frame and the third frame and; wherein the horizontal displacement means comprises a pair of attachment plates, an upper roller, and a lower roller, wherein the pair of attachment plates are coupled to a longitudinal support beam of the second frame and extend downward and flank opposite vertical side surfaces of a longitudinal support beam of the first frame, wherein the upper roller is positioned between and contacts a lower horizontal surface of said longitudinal support beam of the second frame and an upper horizontal surface of said longitudinal support beam of the first frame, and wherein the lower roller is positioned such that it contacts a lower horizontal surface of said longitudinal support beam of the first frame.