JIB PROJECTION OF CRANE AND DEVICE AND METHOD FOR ISOLATE-STORING

摘要

PURPOSE: A jib projection of a crane and a device and a method for a hangar are provided to easily attach and detach a subsidiary hook without moving with carrying the subsidiary hook and a wire rope. CONSTITUTION: A jib projection and a hangar device of a crane comprises:a front end sheave(23) being attached removably in the lower end of the front of a boom(3); a rotary moving apparatus(80) for rotatively moving a rotary bracket(30); and a link(124) connecting the upper unit of the front end of the boom with the front end sheave for freely moving rotatively for locating the front end sheave to the upper unit of the front direction of the boom while the rotary bracket advancing to the front direction of the boom.