Patent ID: 7213717

Claim:
Telescopic boom of a crane comprising a pivot section ( 2 ) structured and arranged to be pivoted up or down on a horizontal luffing axle ( 3 ), telescopic sections ( 5 , 6 , 7 , 8 ) concentrically arranged to telescope out of the pivot section ( 2 ), a guying ( 9 ) having at least one guy stand ( 11 ) structured and arranged to pivot on either the pivot section ( 2 ) or one telescopic section ( 5 ) of the concentric pivoting and telescopic sections ( 5 , 6 , 7 , 8 ), at least one guy cable ( 10 ) structured and arranged to be supported by the guy stand ( 11 ), and erection mechanism ( 17 ) for raising the guy stand ( 11 ) out of folded transportation position into fully-raised and extended operating position, wherein the erection mechanism comprises a tension rod or stay ( 17 ) structured and arranged to terminate at an outer extended end of the guy stand ( 11 ) remote from said pivot section ( 2 ) or said one telescopic section ( 5 ) on which the guy stand ( 11 ) is structured and arranged to pivot and connect the guy stand ( 11 ) with a telescopic section ( 6 ) internally adjacent said pivot section ( 2 ) or said one telescopic section ( 5 ) on which the guy stand ( 11 ) is structured and arranged to pivot, the guy cable ( 10 ) runs unattached over the guy stand ( 11 ) and terminates at respective attachment points situated upon said pivot section ( 2 ) and one ( 8 ) of said telescopic sections ( 5 , 6 , 7 , 8 ), and in fully raised, extended and operating position, said tension rod or stay ( 17 ) extends between said guy stand ( 11 ) and guy cable ( 10 ) and forms acute angles with each, facing the boom.