TELESCOPIC BOOM Russian patent published in 2025 - IPC B66C23/30 

FIELD: transporting.

SUBSTANCE: invention relates to lifting, loading and excavating equipment and can be used in production of working elements of engineering machines for clearing. Telescopic boom comprises outer section, inner section, middle section with extension drive and hydraulic system. Extension drive is a double-rod hydraulic cylinder fixed on the middle section, on the rods of which there are blocks with ropes. Middle section is connected to the inner one by means of ropes thrown over the blocks. Hydraulic system is equipped with two-position hydraulic control valve and two functional groups, each of which consists of constant throttle, hydraulic lock and throttle check valve.

EFFECT: control of boom extension and retraction speed with provision of uniform movement regardless of load, as well as compactness in retracted position.

1 cl, 2 dwg