OPERATOR'S CRANE Russian patent published in 1995 - IPC

FIELD: load hoisting machinery engineering. SUBSTANCE: operator's crane it intended for taking motion films under complicated nature and stage conditions. The crane has support 1 and boom 7 mounted inclinably and rotatably relative to the support. The boom has main coupling 6 connected with support 1, main central upright 12 mounted rigidly on the main coupling in the vertical longitudinal symmetry plane of the boom, two main side uprights mounted rigidly on the main coupling at equal angles relative to central upright, rope pulleys placed on free ends of the main uprights, cantilever 8 with counterweight 9, beam 11 made up of at least two sections 10 connected with each other by means of at least one intermediate coupling 15, tension members passed over the rope pulleys of the main uprights and connected by one end with the cantilever and by the other with the beam, and mechanisms for tightening the tension members. Besides the boom is provided with at least one additional central upright installed between free end of the boom and the main central upright, additional rope pulleys mounted on free ends of additional central uprights, additional central tension members passed over the pulleys of the main and additional central uprights and connected by one end with the cantilever and by the other with the beam, and mechanisms for tightening the additional central tension members. EFFECT: reduced height of main uprights, resulting in more convenient mounting and servicing of the crane. 4 cl, 5 dwg