Patent ID: 7137518

Claim:
A telescopic crane, comprising: a mobile substructure; a superstructure rotatably mounted on the mobile substructure; a telescopic boom structure pivotally mounted to the superstructure for angular motion along a luffing plane, wherein the telescopic boom structure includes a base section and at least one telescoping section, and wherein the telescoping section is received in the base section and is displaceable between retracted and extended positions; at least one rigid guy support having a foot end and a top end, wherein the foot end of the at least one rigid guy support is pivotally attached to the telescopic boom structure; a tension arrangement including a first tension sub-arrangement and a second tension sub-arrangement, wherein the top end of the at least one rigid guy support is connected via the first tension sub-arrangement to the base section, and wherein the top end of the at least one rigid guy support is further connected via the second tension sub-arrangement to a top end of the boom structure; and at least one adjusting device attached to the at least guy one support and the boom structure, the at least one adjusting device positions the at least one guy support in at least one inclined position with respect to the luffing plane of the telescopic boom structure.