Locking system for a telescopic crane jib with movable locking unit

摘要

The present invention relates to a locking system for the telescopic crane jib of a mobile crane , lock (lock) the telescopic cylinder (10, 20) is formed by a locking unit (21) and between the elastic member 104 can be extended or retracted the elastic member, the locking unit 21 is to be moved in the longitudinal direction is placed in telescoping cylinder (10, 20).