Patent ID: 7232189

Claim:
A container for disposition of waste concrete comprising: an undercarriage configured to mount on the frame of a roller dump truck; a floor attached to the undercarriage; opposing side walls attached to the floor; a back wall; and a front wall assembly that provides a lifting point for the container; wherein the front wall assembly comprises an A-frame structure comprising: (a) opposing substantially horizontal members attached at their aft ends to the undercarriage by a rotatable shaft, and attached to the undercarriage at their forward ends by a shaft and rotation retainer such that the horizontal members are pivotable with respect to the undercarriage; and (b) two substantially upright members each rigidly attached to a forward end of the horizontal members and angled toward the midline of the container to be attachable to a common lifting point in an A-frame configuration, and wherein the upright members are rigidly attached to the front wall such that rotation of the A-frame assembly moves the front wall back with respect to the floor and side walls; and wherein the front wall assembly is moveable toward the back wall with respect to the side walls and floor effective to break a bond between hardened concrete in the container and the walls of the container when a lifting force is applied to the front wall assembly lifting point during use.