| 摘要 |
PURPOSE: A telescopic jib for a vehicle-type crane is provided to secure the jib improved in the resistance to warping and therefore suitable for supporting an extreme load in, for example, pull-in jib operation or in a wire supporting type system or when positioning the jib supporting a substantial load while positioned in an almost vertical direction. CONSTITUTION: A telescopic jib for a vehicle-type crane comprises a base jib part supported on the crane and a retractable and extensible telescopic jib part supported by the base jib part. At least one of the jib parts comprises an upper profile part(12) and a lower profile part(14). The lower profile part comprises a plurality of adjacent shell segments(14b,14c,14d) each having an outwardly curved shape, and the upper profile part comprises a plurality of adjacent shell segments(12b,12c,12d) having an outwardly curved shape. The end portions of adjacent segments of the upper profile part abut each other at an obtuse angle.
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