Mobile concrete supply pump flexible boom - has hinged middle and upper arm ends swinging between tower side piece

摘要

The rotating tower is mounted on a vehicle. It has the lower arm of a three-piece boom arm, fitted with a concrete supply duct and with middle and upper arms folding opposite ways below the lower one between the tops of two walling pieces. There is a pump unit for supplying concrete on site. - The ends of the middle arm and upper arm are hinged together, and mounted so as to swivel through between the spaced walling pieces of the tower. This increases the length of reach of the boom, without detracting from the favourable positioning of the middle and upper arms below the lower arm.