Patent ID: 6089388
Filing Date: 2000-07-18
Classification: B66C

Abstract:
A mobile crane comprising:a rotating deck;a jib supported by said deck and pivotally connected thereto;a first hydraulic ram connected to the jib for rotating the jib with respect to said deck about its pivotal connection with said deck between a lowered transport position and a raised position;a counter-jib supporting a ballast, said counter-jib supported on said jib in said lowered transport position and movable with said jib between the lowered transport position and the raised position of the jib;a support frame connected to said deck at a first connect point adjacent said pivotal connection between said jib and said deck and connected to said deck at a second connect point when said jib is in the raised position and disconnected from said deck when said jib is in the lowered transport position, and wherein said support frame is rotatably connected to said counter-jib;a second hydraulic ram connected to said counter-jib and to said support frame, said second hydraulic ram rotating said counter-jib with respect to the support frame about the rotatable connection of said counter-jib and support frame when the support frame is connected to said deck at said second connect point; andwherein rotation of the jib, and the counter-jib supported thereon, by the first hydraulic ram from said lowered transport position to the raised position rotates the support frame about the first connect point with respect to the deck to the second connect point for connection of the support plate to said deck at said second connect point.