The assembly cradle has two support tubes (1) clamping between floor and ceiling or under balcony sills. The tubes are angled in the middle by 20 degrees. The connecting plates (2) for the jib arms (6) and draw belt (7) are welded onto the support tube. The support tube contains an adjustable vertical slider (5) for adapting to the required height. Protective caps fit onto the sliders and support tube. The pair of jib arms can be connected to the cradle at the lower connecting tabs by means of rotary bolts. The draw belt transfers the load forces from the jib arm to the support tube.
