Invalid lift

Claim 1

A TRANSPORTABLE INVALID LIFT, COMPRISING: AN UPRIGHT FRAME FORMED OF A PAIR OF LEGS PIVOTALLY ASSOCIATED AT THEIR UPPER ENDS, SAID FRAME LEGS BEING SWINGABLE FROM A POSITION WHEREIN THEY ARE DRAWN TOGETHER IN CLOSELY ADJACENT RELATIONSHIP TO A DIVERGING POSITION WHEREIN THEIR LOWER ENDS ARE WIDELY SPACED; A PAIR OF WHEELED BASE MEMBERS ON AND PROJECTING OUTWARDLY FROM THE LOWER ENDS OF SAID FRAME LEGS; A HINGED CROSSARM ON AND EXTENDING BETWEEN SAID FRAME LEGS, SAID HINGED CROSSARM BEING MANUALLY PIVOTAL FROM A STRAIGHT HORIZONTAL POSITION WHEREIN SAID FRAME LEGS ARE MAINTAINED IN A DIVERGING RELATIONSHIP TO A JACKKNIFED CONDITION WHEREIN SAID FRAME LEG AND BASE MEMBERS ARE DRAWN TOGETHER; A LIFT ARM VERTICALLY-PIVOTALLY MOUNTED ON AND PROJECTING OUTWARDLY FROM THE TOP OF SAID FRAME, THE OUTER END OF SAID ARM BEING ADAPTED TO HAVE INVALID-SUPPORTING ELEMENTS REMOVABLY SECURED THERETO; A JACK-SUPPORTING BAR REMOVABLY REVOLUBLY SUPPORTED BY AND BETWEEN SAID FRAME LEGS; A JACK ROTATABLY MOUNTED ON SAID BAR AND HAVING AN EXTENDABLE PISTON DETACHABLY SECURED TO SAID LIFT ARM INTERMEDIATE ITS LENGTH, SAID JACK BEING ADAPTED TO RAISE THE OUTER END OF SAID ARM; AND OPERATING MEANS ON SAID JACK.