Patent ID: 7823893

Claim:
A hand truck comprising a rolling base, a toe-plate shelf coupled to the rolling base, an auxiliary carrier including a movable shelf arranged to lie above the toe-plate shelf and a shelf position changer means for changing the position of the movable shelf on the rolling base relative to the toe-plate shelf underlying the movable shelf to vary the elevation of the movable shelf above the toe-plate shelf, wherein the shelf position changer includes a shelf mover mounted for up-and-down movement on the rolling base and the movable shelf is coupled to the shelf mover to move therewith between a lowered position near the toe-plate shelf and a raised position elevated above the toe-plate shelf, wherein the rolling base includes a truck frame and a wheel unit coupled to the truck frame, the truck frame includes first and second upright rails arranged to lie in spaced-apart relation to one another and rungs arranged to interconnect the first and second upright rails, and the shelf mover includes a first side leg mounted for sliding movement on the first upright rail, a second side leg mounted for sliding movement on the second upright rail, and a crossbar interconnecting the first and second side legs, and the movable shelf is coupled to the first and second side legs to move therewith, and wherein the first upright rail is formed to include an outer channel, the first side leg of the shelf mover includes an inwardly facing surface facing toward the outer channel, and the shelf mover further includes first, second, and third blocks coupled to the inwardly facing surface of the first side leg and arranged to extend into and move in the outer channel during up-and-down movement of the shelf mover on the rolling base to provide guide means for guiding the shelf mover relative to the truck frame as a user lifts, pivots, lowers, and raises the shelf mover to change elevation of movable shelf relative to the toe-plate shelf.