Mobile load handling or lifting machines

Claim 1

A mobile machine for load handling purposes comprising a wheeled chassis consisting of a forward wheeled chassis structure slidably engaging a rear wheeled chassis structure for fore and aft chassis extension and retraction of the machine; a telescopic boom longitudinally carried by said rear chassis structure and comprising two members of which one of said members is forwardly extendible and rearwardly retractable relative to the other of said members in a telescopic manner; ram means acting between said members of said telescopic boom for effecting forward extension and rearward retraction of the said one member relative to said other member; forwardly extending parallel motion lifting and lowering linkage pivotally connected to the said one member of said telescopic boom; an attachment head for receiving load handling means carried by the forward end of said parallel motion linkage; ram means acting between said one member of said telescopic boom and said parallel motion linkage for angularly raising and lowering said linkage and said attachment head about said pivotal connection of said linkage to said one member; angularly movable support linkage carrying said telescopic boom from said rear wheeled chassis structure; ram means acting between said rear wheeled chassis structure and said angularly movable support linkage in order to bodily advance and retract said telescopic boom and said parallel motion linkage and said attachment head carried thereby relative to said wheeled chassis; and connecting linkage pivotally connected between said angularly movable support linkage and said forward wheeled chassis structure whereby, on ram operation of said support linkage to bodily advance said telescopic boom, fore and aft extension of said wheeled chassis is effected to counteract any forward tipping of the machine.