Patent ID: 8403109

Claim:
An apparatus for providing safe access to a top of a mobile container, said mobile container having a top, a longitudinal dimension, and a plurality of hatches arrayed along said longitudinal dimension on said top, said apparatus comprising: a raised platform; an extended cage attached to said raised platform wherein said extended cage extends along said longitudinal dimension and includes an open bottom for accessing said hatches of said mobile container; and a tracking gate attached to said extended cage at a first location below the upper edge of said extended cage and adapted to vary an effective interior size of said extended cage, said tracking gate is further attached to a belt positioned below said first location and wherein said belt is engaged with a drive socket and rotation of said drive socket causes said tracking gate to move within said extended cage thereby varying said effective interior size of said extended cage, said tracking gate includes a first side and an opposing second side adjacent to said extended cage, wherein said belt is attached to said first side of said tracking gate and said extended cage.