Portable lifts

Claim 1

A JACK COMPRISING A SUPPORTING BASE, A LIFTING BEAM MOUNTED ON SAID BASE FOR PIVOTAL MOVEMENT TO RAISE AND LOWER A LOAD APPLIED TO A LOAD-LIFTING END THEREOF, FULCRUM MEANS SUPPORTING THE LIFTING BEAM ON THE BASE FOR MOVEMENT LONGITUDINALLY OF THE BASE WHILE ROCKING ON SAID FULCRUM MEANS, CONTROL MEANS ACTING BETWEEN SAID BASE AND SAID BEAM FOR CAUSING PREDETERMINED MOVEMENT OF THE BEAM LONGITUDINALLY OF THE BASE AS THE BEAM ROCKS ON ITS FULCRUM, FORCE-APPLYING MEANS CONNECTED TO AND ACTING BETWEEN SAID BEAM AND SAID BASE FOR ROCKING THE BEAM ON ITS FULCRUM, AND CRANE MEANS FOR ACTING IN CONJUNCTION WITH SAID LIFTING BEAM TO SUPPORT A TIRE AND WHEEL ASSEMBLY ELEVATED BY THE LIFTING BEAM, SAID CRANE MEANS INCLUDING A POST MOUNTED ON SAID BASE, AN ARM EXTENDING GENERALLY HORIZONTALLY FROM SAID POST AND SWINGABLE ABOUT THE POST, SLING MEANS CARRIED BY SAID ARM FROM A POINT ABOVE SAID LOAD-LIFTING END OF SAID BEAM, AND MEANS FOR ADJUSTABLY RAISING AND LOWERING SAID SLING, SAID SLING BEING MOUNTED ON SAID ARM FOR MOVEMENT THEREALONG TO ALIGN THE SLING FOR ATTACHMENT TO SAID TIRE AND WHEEL ASSEMBLY.