| 摘要 |
PURPOSE: A telescoping system for a crane jib and an auxiliary jib is provided to use with a movable crane without own telescoping system, and to reduce costs by reducing independent telescopic mechanisms for an auxiliary jib. CONSTITUTION: A telescoping system for a crane jib comprises a telescopic cylinder(2), a first telescopic member locking unit(3), a telescopic main jib(1), and a telescopic auxiliary jib(11). The first telescopic member locking unit is arranged in a base part(9) of the telescopic cylinder. In order to telescope an auxiliary jib, a second telescopic member locking unit(4) is arranged on the telescopic cylinder locating in the upper part of the first telescopic member locking unit. The second telescopic member locking unit is arranged in the upper end of the telescopic cylinder locating in the opposite side of the base part. |
