HOISTING MACHINE BOOM Russian patent published in 2020 - IPC B66C23/04 

FIELD: transport machine building.

SUBSTANCE: invention relates to hoisting machines, in particular to telescopic booms of self-propelled lifting cranes. Boom of hoisting machine includes root non-sliding, middle and end sliding sections. In boom there are two units of drive hydraulic cylinders consisting of each of two hydraulic cylinders, input and output, rigidly connected to each other, rods of which are turned in opposite sides, wherein one unit is connected to boom root section by inlet hydraulic cylinder rod with possibility of supplying hydraulic fluid from pumping unit of hoisting machine, and the second unit is the output hydraulic cylinder rod to the end section. Blocks are interconnected by pivotal rods of hydraulic cylinders to ensure flow of hydraulic fluid through flexible pipelines from rod of hydraulic cylinders of one unit to hydraulic cylinders of the other unit. Rods of all four hydraulic cylinders have tubular section, inside rods there are two pipelines for hydraulic fluid through rods and pistons of hydraulic cylinders. Rod and rodless cavities of hydraulic cylinders of each unit are interconnected by flexible pipelines.

EFFECT: reduced length of hydraulic cylinders and their rods.

1 cl, 4 dwg