Motorized staging suspending and adjusting carrier

Claim 1

THE COMBINATION OF A TWO-RAILWAY TRACK HAVING AT LEAST ONE CURVED RUN AND TWO STRAIGHT RUNS JOINED BY SAID CURVED RUN, SAID RAILS BEING I-BEAM FORMATION, AND A WHEELED TRUCK MOUNTED FOR TRAVEL ON SAID TRACK, SAID TRUCK HAVING A DECK PLATE SPANNING THE TRACK, THE WHEELS OF THE TRUCK BEING IN SETS WITH EACH SET SUSPENDED FROM THE DECK PLATE AND INCLUDING, IN EACH SET, A PAIR OF WHEELS LYING ONE WHEEL OF THE PAIR AT ONE SIDE AND THE OTHER WHEEL OF THE PAIR AT THE OTHER SIDE OF THE WEB OF A CONCERNED RAIL AND EACH MOUNTED TO ROTATE ABOUT A RESPECTIVE HORIZONTAL AXIS TRANSVERSE TO THE TRACK SPACING THE WHEEL IN ROLLING CONTACT WITH A FLANGE OF THE RAIL, TWO OF SAID SETS OF WHEELS BEING PROVIDED FOR THE OUTSIDE RAIL ONE LOCATED ADJACENT ONE END AND THE OTHER LOCATED ADJACENT THE OTHER END OF THE DECK PLATE AND WITH EACH OF SUCH TWO SETS BEING CARRIED BY THE DECK PLATE FOR BODILY SWIVEL MOVEMENT ABOUT A VERTICAL AXIS FIXED RELATION TO THE DECK PLATE, ONE OF SAID OF WHEELS BEING PROVIDED FOR THE INNER RAIL PLACED TO OCCUPY A TRANSVERSE VERTICAL PLANE LYING BETWEEN SAID TWO WHEEL SETS PROVIDED FOR THE OUTSIDE-RAIL AND PROJECTED NORMAL TO THE LONGITUDINAL VERTICAL PLANE OCCUPIED BY THE LATTER TWO SETS.