Barrier boom (1) of a bar for vehicles formed as an articulated boom with a column barrier, a barrade barrier (1) and a drive mechanism for pivoting the barrier boom (1) between the closed position and deapertura, comprising a first section of the barrier boom (2), connectable with deaccionamiento mechanism for pivoting the barrier boom (1) and a second section of the barrier boom (3), which is connected wing first section barrier boom (2) by means of a rocker pivot joint (4) on a horizontal axis, characterized in that for positioning the second section of the barrier boom (3) in situaciónhorizontal is provided a rope (5 ), which is arranged in the first section of the barrier boom (2) parallel to ejelongitudinal of the first section of the barrier boom (2) and is tensioned and locked on two rollers decuerda guiding (6, 8), where rodil as for guiding rope (6) is arranged coaxially to the swiveling axis of the primerasección the barrier boom (2) and connected torsionally rigid with a shaft (7) attachable to the debarrera column nonrotatably in the assembled state and the other guiding roller cord (8) forms the joint axis dela pivot joint (4) between the two sections (2,3) of the barrier boom and connected torsionally with lasegunda section barrier boom (3).
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