Roadway transition for expansion joints on road bridges etc.

Claim 1

In a roadway transition, for expansion joints on road bridges and the like, of the type including at least one intermediate bar extending, in an expansion joint; parallel to the joint edges and supported at at least two points along its length, at least two lazy tongs guiding each intermediate bar and articulated, in laterally spaced relation to each other, on the joint edges, with each lazy tongs having at least two tong sections connected by intermediate hinges and each lazy tongs being variable in its opening width transversely of the expansion joint, so thAt the spacings of opposite sides of the associated intermediate bar, from the adjacent respective joint edges or from adjoining intermediate bars, vary uniformly in variations of the joint width and are always the same relative to each other; the improvement comprising, in combination, said lazy tongs having their hinges extending horizontally and parallel to the joint edges, and said lazy tongus being oriented vertically and forming supporting beams for the intermediate bars; said lazy tongs having upper end hinges fixedly articulated at points in the range of the joint edges and having upper and lower intermediate hinges which thereby are in common vertical planes, with the upper intermediate hinges lying, in any position of the lazy tongs, in the horizontal plane of the upper end hinges.