US Patent 10252855 Ramp wall for a container

A ramp wall includes a load-bearing support structure having top, bottom and side edges. A first pivot assembly is connected with the support structure bottom edge and adapted for removable connection with at least one container wall. The first pivot assembly includes at least one counter balancing torsion spring that is connected with the bottom edge of the support structure. The spring has a torque force that is generally equal to the gravitational torque force generated by the weight of the ramp wall when it is connected with at least one container wall, allowing manual operation of the ramp wall between a vertical closed position and a horizontal or inclined open position. A second pivot assembly is connected with one of the support structure side edges and adapted for removable connection with a container side wall for swinging movement about a vertical axis between a vertical open position and a vertical closed position.