Portable dolly with articulated adjustable truss

Claim 1

A DOLLY FOR PORTABLY SUPPORTING A LOAD AT AN ADJUSTABLE ELEVATION AND LATERAL ANGLE RELATIVE TO A SUPPORTING SURFACE, COMPRISING: AN AXLE ADAPTED TO MOUNT WHEELS ROTATABLY THEREON; AND AN ARTICULATED ADJUSTABLE TRUSS INCLUDING A FRAME ATTACHED TO SAID AXLE AND HAVING MEANS FOR PIVOTAL CONNECTION TO THE LOAD TO LOCATE SAID AXLE FOR ARCUATE MOVEMENT ABOUT A FIRST AXIS DEFINED BY SAID PIVOTAL MEANS, AND A PAIR OF ADJUSTABLE LEGS AFFIXED AT FIRST ENDS TO SAID FRAME AT POINTS SPACED APART LONGITUDINALLY OF SAID AXLE, SAID LEGS HAVING MEANS AT SECOND ENDS THEREOF FOR PIVOTAL CONNECTION AT SPACED JOINTS TO THE LOAD; EACH OF SAID ADJUSTABLE LEGS INCLUDING JACK MEANS AND SPRINGBIASED TELESCOPING MEANS EACH EXTENSIBLE LONGITUDINALLY OF THE CORRESPONDING LEG, AND A PIVOT JOINT LOCATED INTERMEDIATE SAID JACK MEANS AND SAID TELESCOPING MEANS; SAID PIVOT JOINT BEING CONSTRUCTED AND ARRANGED TO PERMIT RELATIVE ANGULAR MOVEMENT BETWEEN SAID JACK MEANS AND SAID TELESCOPING MEANS AT LEAST ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO SAID FIRST AXIS; WHEREBY EXTENSION AND CONTRACTION OF EITHER LEG IS ACCOMPANIED BY ARTICULATION THEREOF AND BY ANGULAR MOVEMENT OF SAID AXLE ABOUT SAID FIRST AXIS.