Concrete pumping vehicle as footed boom reciprocates boom by double-acting hydraulic cylinder led through boom box and telescoping parts so box swivel axis intersects cylinder axis at right angles.

摘要

The ends of a double-acting hydraulic cylinder run through the boom box (38) and the telescoping part (40) is fixed at points near the respective ends of the box and part (40). The boom box (38) swivel axis (32) is formed by a divided bearing part at axial spacing from the rear end fixing point in the direction of the foot (28). The axis (32) is thus so positioned that it transversely intersects the axis of cylinder movement. The bearing point is provided by two diametrically opposed bearing eyelets or journals. The telescoping part (40) consists of two or more telescoping tubes and the boom box axis (32) is spaced (S) one fifth or at most one third of the box side length from the rear end of the boom box (38). The boom box runs on roller or slide bearings near its front end during telescoping travel.