Apparatus for controlling the movement of hydraulically movable work equipment and a path control arrangement

A path control arrangement for hydraulically movable work equipment that is arranged at one end of a length-adjustable arm that is pivotable about an axis fixed with respect to the carrier, with hydraulic drive elements, comprising a drive unit for length for changing the length of the arm and a drive unit for angle for pivoting the arm, a control device which comprises a data memory and a processing arrangement, an operating device which is connected to the control device and generates input control signals depending on its position, position sensors which ascertain the length of the arm and its angle in relation to a predetermined plane, said control device having means operable from an actual starting position for ascertaining a sequence of desired positions and delivering a drive signal to the hydraulic drive units in order to move the work equipment from its current position into the next desired position, said control device having means for preventing the release of the next desired position until said position sensors report that the work equipment is located within a predetermined spacing about the current desired position.