Portable crane

Claim 1

A WHEELED VEHICLE COMPRISING A HORIZONTAL BED, A HOISTING FRAME HAVING TWO SUBSTANTIALLY PARALLEL LEGS EACH PIVOTED AT THE SIDES OF SAID VEHICLE REARWARD OF THE REAR WHEELS THEREOF RESPECTIVELY AND AT THE REAR END OF SAID BED, A CROSS MEMBER CONNECTING SAID LEGS REMOTE FROM THE PIVOT AXIS OF SAID LEGS, SAID HOISTING FRAME BEING SWINGABLE FROM A FORWARD DOWN POSITION TO A REARWARD UP HOISTING POSITION, AN EXTENSION ON EACH SAID LEG INTEGRAL THEREWITH AND COMMENCING AT THE PIVOT AXIS AND OF LESS LENGTH THAN THE DISTANCE FROM SAID PIVOT AXIS TO THE GROUND, A PLATFORM SUBSTANTIALLY IN THE PLANE OF SAID EXTENSIONS AND EXTENDING THEREBETWEEN, SAID EXTENSIONS AND PLATFORM MOVABLE FROM A HORIZONTAL POSITION IN ALIGNMENT WITH SAID BED WHEN SAID FRAME IS IN FORWARD DOWN POSITION TO A SUBSTANTIALLY VERTICAL POSITION DOWNWARD FROM SAID PIVOT AXIS WHEN SAID FRAME IS IN SAID UP HOISTING POSITION, MEANS FOR CONTROLLING THE POSITION OF SAID FRAME, A PULLEY ON SAID CROSS MEMBER, AND MEANS ON SAID WHEELED VEHICLE FOR APPLYING A PULLING FORCE TO A CABLE OVER SAID PULLEY TO APPLY A LIFTING FORCE TO AN OBJECT TO THE REAR OF SAID WHEELED VEHICLE WHEN SAID FRAME IS IN REARWARD UP HOISTING POSITION AND FOR THEREAFTER ROTATING SAID FRAME FORWARDLY WHILE SAID LIFTED OBJECT IS IN SUSPENDED CONDITION ADJACENT SAID PLATFORM, WHEREBY AS SAID PLATFORM IS MOVED TOWARD HORIZONTAL POSITION THE WEIGHT OF SAID OBJECT WILL BE PROGRESSIVELY TRANSFERRED FROM SAID CABLE TO SAID PLATFORM AND AFTER SAID PLATFORM IS HORIZONTAL SAID OBJECT MAY BE MOVED FORWARD BY SAID CABLE TO SAID BED TO A POSITION BETWEEN SAID LEGS.