Patent ID: 6126220
Filing Date: 2000-10-03
Classification: B60P,B62D

Abstract:
A retractable cargo box extension assembly for a cargo box having an area therein for hauling material, comprising:a plurality of lift arm assemblies connected to a cargo box and to a top frame for selectively raising said top frame upwardly to an extended position and lowering said top frame to a retracted position;an interior wall connected to the top frame and extending down to the cargo box for increasing the area in the cargo box when the lift arm assemblies are in the extended position; anda closed loop drive system connected to each of the lift arm assemblies and to one or more actuator means for simultaneously operating each of the lift arm assemblies when raising or lowering the top frame, wherein the closed loop drive system comprises a cable extending from an actuator cylinder to each lift arm assembly and back to said actuator cylinder to form a closed loop.