ADDITIONAL BOOM, CRANE, METHOD OF UNFOLDING ADDITIONAL BOOM AND METHOD OF FOLDING ADDITIONAL BOOM Russian patent published in 2024 - IPC B66C23/68 

FIELD: crane equipment.

SUBSTANCE: additional boom comprises housing (1) of additional boom and screw jack (2). Additional boom body (1) comprises a connecting frame with coaxially located first connecting hole (111) and second connecting hole (112). Screw jack (2) comprises first shaft (21), second shaft (22) and drive mechanism (23). First shaft (21) and second shaft (22) are located between the first connection hole (111) and the second connection hole (112) and coaxially to the first connection hole (111). Drive mechanism (23) is coupled with first shaft (21) and second shaft (22) for simultaneous extension and simultaneous retraction of first shaft (21) and second shaft (22). When first shaft (21) is in extended position, first shaft (21) is inserted into first connection hole (111), and when first shaft (21) is in the retracted position, first shaft (21) is outside the first connecting hole (111); when second shaft (22) is in extended position, second shaft (22) is inserted into second connecting hole (112), and when second shaft (22) is in retracted position, second shaft (22) is outside of second connecting hole (112). Connecting frame of housing of additional boom interacts with first shaft and second shaft of screw jack, note here that installation and removal of additional boom is performed due to simultaneous extension and simultaneous retraction of first shaft and second shaft, due to which this operation is very easy to perform.

EFFECT: higher efficiency of installation work is achieved.

19 cl, 19 dwg