BOOM CONSTRUCTION, IN PARTICULAR FOR A TRUCK-MOUNTED CONCRETE PUMP, AND TRUCK-MOUNTED CONCRETE PUMP

摘要

A boom construction for truck-mounted concrete pumps has at least a first boom arm and a second boom arm that are articulatedly jointed to each other and that are rotatable relatively to each other about an axis. A drive pivots the boom arms. A piston-cylinder arrangement and a gear transform piston reciprocating movement into rotary movement for boom arm pivoting, said arrangement having first and second pistons that form part of the gear and that interact with outer rings of the gear.