LIFTING DEVICE Russian patent published in 2021 - IPC B66C23/36 

FIELD: lifting devices.

SUBSTANCE: invention relates to lifting devices. The hoisting device contains a boom and chassis assembly containing a rail guide and a plurality of first assemblies (2) of balancing bogies. Each of the first balancing carriage assemblies (2) is located on a rail and is located in the front area under the boom assembly. In the first operating state, each of the first nodes (2) of the balance carts contains the first balance beam (22) and the two first carts (21), and the two ends of the first balance beams (22) rest on the first two carts (21), and in the second operating state, each of the first nodes (2) of the balancing trolleys additionally contains a group of balancing beams and a group of trolleys, and the group of trolleys is outside the first trolley (21) along the direction of passage of the rail, and the ends of the group of balancing beams rest on the first balancing beam (22) and a group of carts. The weight to be lifted in the first operating state does not exceed the target weight to be lifted, and the weight to be lifted in the second operating state is greater than the target weight to be lifted.

EFFECT: reduced underutilization of the lifting force with a small lifted weight and an increase in the lifting force due to the design when lifting a large weight, as well as a decrease in the specific pressure on the ground.

14 cl, 20 dwg