Abstract: A dual attachment arm auxiliary or tag axle system for a work vehicle of the class including transit concrete mixer trucks utilizes an improved pivotal mounting system that is more rugged and dependable than previous systems and reduces associated pivot mount wear. The system uses a through-the-chassis member mounting which includes a spaced stabilizing arm to provide dual attachment for each arm and to prevent problems associated with a cantilevered arrangement. The improved mounting joints may take any of several forms. The through-the-chassis member configuration maximizes the distance behind the transit concrete mixing vehicle that the tag axle extends.

Abstract: The specification discloses linkage assemblies (16, 59) for effecting selective pivotal movement of hinged structures. The invention is particularly adapted for use with sectional chute assemblies of concrete mixers, either for moving adjacent chute sections between extended and retracted positions, or for swinging the entire chute assembly.