US Patent 7360262 Lifting and transfer apparatus

A portable lifting apparatus for lifting and transferring of heavy objects. The lifting apparatus having a load-supporting platform which can be moved both vertically and rotated about the vertical axis of an upwardly extending lifting column. The lifting apparatus further includes an outrigger linkage coupled to the lifting column and is provided with a load support coupled to a retractable pulley. The lifting column is attached to a base and is normally prevented from rotating relative thereto.