Lorry carried three-piece concrete supply flexible jib - has bottom arm on full circle driven rotary hinge with lengthways axis

摘要

The lower arm of a three part bending jib arm unit is on a swivelling hinge at the top end of a rotating column, which in turn is mounted in the vehicle frame so as to turn full circle. Middle arm and upper arm together are foldable downward against the lower arm. The lower arm (5) is connected to a rotary hinge (7) with rotary drive for a 360 deg. turn; the axis of this is aligned along the length of the lower arm. The other two arms (9, 12) may lie at the side close to the lower arm, in the transport position. The concrete supply duct attached to the jib can be led centrally through the rotary hinge by means of a rotary pipe hinge. This permits further movement combinations without affecting manoeuvreability, and reduces overall height for transport.