Patent ID: 7543851

Claim:
A mobile concrete pump with a structural frame ( 14 ) mounted on a truck undercarriage ( 10 ) of a truck chassis ( 12 ), supportable upon the ground when lifting of the truck undercarriage, with a boom stand ( 22 ) rotatable about a vertical axis ( 20 ) provided upon the structural frame ( 14 ) and with a concrete distribution boom ( 24 ) in the form of a multi-arm articulated boom, including a first boom arm ( 1 ) pivotable relative to the boom stand ( 22 ) via a first articulation linkage (A) about a horizontal articulation axis and further boom arms ( 2 through 7 ) pivotable relative to each other via articulation linkages (B-G) a bout horizontal articulation axes, and a trailer ( 32 ) connectable with the truck undercarriage ( 10 ) via a coupling member ( 36 ) when in the transport configuration, the trailer including a pivot mount ( 40 ) rotatable about a vertical axis for receiving the set of arms projecting beyond the end of the truck undercarriage ( 10 ) in a configuration of travel on the road, in which a second boom arm ( 2 ) is folded out relative to the first boom arm ( 1 ) in the extended position of a second articulation linkage (B) and at least some of the remaining boom arms ( 3 through 7 ) configured in the folded configuration together with the first boom arm ( 1 ) form the coupling arm ( 36 ), and wherein the second articulation linkage (B) is freely pivotable about its articulation axis when in the travel configuration.