KRAN MED EN KRANSTAMME SOM BESTAAR AF EN HOVEDDEL FORBUNDET MED EN NEDERSTE LEJRNINGSDEL OG FREMGANGSMAADE VED FREMSTILLING AF EN SAADAN KRAN

摘要

An improved joint and method of providing such a joint between the upper and lower portions of a rotatably driven crane post, comprising a sleeve-shaped member formed internally with screw threads and provided at the lower end of the upper position, a pin provided at the upper part of the lower post portion and formed externally with screw threads matching the sleeve member threads, and a collar on the lower post portion below the pin against which collar the sleeve-shaped member is pressed upon screwing together of the lower and upper post portions to form said joint.