Patent ID: 6394496
Filing Date: 2002-05-28
Classification: B60P,B61D,B65D,B65F

Abstract:
An apparatus used in spaced pairs, mounted one on each of the opposite ends of a mobile tank, which tank is of an open top box general configuration, having a removable lid thereon, said apparatus also being attached to the lid of the tank, which apparatus comprises:(a) a dual level track system having an upper level and a lower level, said track system being mounted at the top of each end of the mobile tank and extending from a first side of the tank to a second side of the tank, the lower level being capped off by track ends; (b) a spring lift roller assembly attached to the tank lid and having casters thereon and positioned for travel on said tank's track's lower level between the track ends located at the first side and the second side of said track; (c) a pair of opposed spring lift lid rollers adapted for travel on the upper level of said track, utilized with each spring lift roller assembly, one of said rollers attached to each side of the same end of the lid, said roller capable of movement from on said track to beyond the edge of the respective side of tank, off said track; whereby when said spring lift roller is moved along the lower level of said track to one of said track ends, one of said spring lift rollers will extend beyond the edge of that respective side of the tank's upper track level, such that as the roller assembly moves toward impact with the track end, the spring lift roller located at the end of the lid in the direction of travel of the roller assembly will roll off the track upper level, and then move arcuately downward, and the lid will rotate upward from a generally horizontal position to a generally vertical position.