Barrier boom implemented as bendable boom of a vehicle barrier

In a bendable barrier boom adapted to serve as a vehicle barrier, comprising a boom column, barrier boom, and a drive for pivoting the barrier boom about a horizontal pivot axis between a blocking and an open position, said harrier boom including a first barrier boom section, connected to the drive for pivoting the barrier boom, and a second barrier boom section, connected to the first barrier boom section via an articulated joint that pivots about a second horizontal axis parallel to the pivot axis, the improvement comprising an arrangement for maintaining the second harrier boom section in a horizontal position, said arrangement including cord, which is arranged in the first barrier boom section parallel to a longitudinal axis thereof and which tighten and clamped around two guide rollers;

• wherein one guide roller is arranged coaxially with respect to said pivot axis and is rigidly connected to a co-axial, non-rotating shaft which, in turn, connected to the boom column;
• wherein the other guide roller forms a joint axis of the articulated joint between the two barrier boom sections, said other guide roller being rotatable with respect to the first boom section and non-rotatable with respect to the second barrier boom section;
• wherein one end of the first barrier boom section is rigidly connected to a barrier head disk;
• wherein said barrier head disk is rigidly connected to an electrically driven, hollow barrier boom shaft extending along the pivot axis;
• wherein the end of the first barrier boom section which faces the boom column is positively accommodated in the barrier head disk;
• wherein the first barrier boom section is connected to the barrier head disk by means of non-positive connecting elements having a break-off function in a direction parallel to the pivot axis, thereby providing a predetermined breaking point, which is integrated into the connecting elements between the barrier head disk and the first barrier boom section;
• and wherein the non-rotating shaft which is connected to the boom column, extends coaxially through the barrier boom shaft.