MAST-LIFTING DEVICE FOR TOWER CRANE WITH TELESCOPIC MAST Russian patent published in 2002 - IPC

FIELD: lifting facilities. SUBSTANCE: invention relates to tower cranes which can be automatically set in operating position and which are provided with telescopic mast foldable for traveling. Lifting device for such mast has stationary or movable support frame on which swivel frame is mounted. Telescopic mast 5 is installed on swivel frame. Mast- lifting device has at least one front strut 13 to provide hinge coupling of front part of swivel frame 3 with rear part 20 of lower outer element 6 of telescopic mast 5, at least one rear strut 14 to provided hinge coupling of intermediate or rear point 23 of swivel frame 3 with rear part 20 of lower outer member 6 of telescopic mast 5. Mast -lifting device has also mechanical unit containing at least two-step power cylinder 15 and systems of tierods 16, 17 for connection of front strut or front struts 13 with lower outer member 6 of telescopic mast 5 and putting complex of members of lifting device 12 into relative motion. EFFECT: reduced overall dimensions and simplified design, provision of reliability bat setting into operating position, lifting of crane and its shipment. 6 cl, 4 dwg