Patent ID: 9085443
Filing Date: 2015-07-21
Classification: B66C

Abstract:
1. A locking system for a telescopic crane jib, comprising: a telescopic crane jib having at least three telescopic parts pinned together by telescopic jib-locks to prevent longitudinal movement of the parts of the telescopic jib when the parts support a load, and having a distance between first and last telescopic jib-locks when the telescopic crane jib is in a retracted state; a telescoping cylinder having an external cylindrical casing; and a locking unit; whereby, in order to extract and retract the telescopic parts, a lock is established by said locking unit between said telescoping cylinder and one of said telescopic parts, and wherein the locking unit is disposed on the telescoping cylinder in such a way that the locking unit can be moved longitudinally with respect to the telescoping cylinder and the locking unit can be fixed to the telescoping cylinder in every position relative to the telescoping cylinder external cylindrical casing, and wherein an overall stroke used to extend a telescopic part is divided between movement of the locking unit and movement of the telescoping cylinder.