Portal arches to change the position of the upper part of the crane vertically, as in the styling crane, are made by telescopic. The distance between the arches in the light along the platform is enough for the free passage of the standard length.
The arrows are attached to the lower belt of the beam farm through the turning circle of 72 of the channels. Each arrow is suspended in the center of the circle with the help of a shkvorn and, in addition, through the supporting rollers of the Operta on the lower shelf of the ring channel. The arrow can be turned manually at an angle up to 180 °.
In the working position, the arrow is attached by bolts to the farm, which are rotated in one of the sides perpendicular to the axis of the track. In the transport position, the arrows are turned along the axis of the platform. Each arrow is made of two channels facing the regiments inside to move along them a crane trolley.
