time the control of the redundant degrees of freedom of the joints is done according to a preprogrammed strategy into which can also be fed collision zones in the form of obstacles ceilings built ins and the like through the operation software and can be considered in the sequence of movement the control member 52 is in the exemplary embodiment illustrated in fig6 to 8 designed as an inclination indicator it exists together with the signal transmitter 53 in a small housing which can be fastened with a bracket 70 fixed against rotation to the end hose 50 the control signals emitted by the inclination indicator 52 53 are fed through the control cable 62 to the central control 31 the inclination indicator 52 which is designed with two axes is direction sensitive it responds to both lateral deflections of the end hose corresponding to fig7 b and also to deflections perpendicular thereto corresponding to fig7 c and is therefore suited together with the signal transmitter to emit a displacement path signal dependent on the measured inclination direction furthermore a speed signal dependent on the measured angle of inclination can be produced for moving the mast top 55 a handle 72 is releasably fastened in the lower part of the end hose 50 by means of a snap bracket 74 the handle 72 consists of two handle parts 72 39 72 34 projecting over the end hose towards diametrically opposed sides the handle is arranged rotatably at approximately 340 u00b0 about the end hose axis.