System for fixing heavy loads e.g. concrete flagstones on crane, has head slip introduced into cross section opening in position when crossing light is released while maintaining stem at outside of fixing sleeve

摘要

The system has a side wall (22) defining a cross section opening (23). An assembling unit assembles a closing finger (40) inside the cross section opening in two different positions. Ends of the finger partially seal a crossing light (34) to prohibit an introduction of a head into the crossing opening in one of the positions. The crossing light is released to allow the introduction in slip of the head into the cross section opening in other position while maintaining the stem at outside of a fixing sleeve.