File with endless carriers and double guiding track

Claim 1

FILE STRUCTURE HAVING CARRIERS FOR FILE MATERIAL MOUNTED ON TWO ENDLESS CHAINS WHEREIN TRUNNIONS ARE PROVIDED AT EACH END OF THE CARRIERS AND CONNECTED TO CARRIER ARMS AND AT LEAST ONE TRUNNION IS FASTENED THROUGH AN ANGLE BRACKET AND TWO OUTER ROLLERS FOR HOLDING THE CARRIERS PARALLEL WITH RESPECT TO EACH OTHER IN ALL POSITIONS AROUND THEIR ORBIT WITHIN THE FILE STRUCTURE AND WHEREIN THERE IS AN INNER TRACKWAY AND AN OUTER TRACKWAY RUNNING PARALLEL IN THE REGION OF THE STRAIGHT-LINE PORTION OF THE CHAINS AND WHEREIN THE ROLLERS OF EACH ANGLE BRACKET ARE CONSTANTING HELD AND GUIDED WITHIN SAID OUTER TRACKWAY, CHARACTERIZED IN THAT: THERE IS PROVIDED A CARRIER ARM ON EACH END OF SAID CARRIERS, EACH OF SAID CARRIER ARMS BEING PROVIDED WITH TWO LEVER ARMS OF UNEQUAL LENGTH, THE SHORT ARM THEREOF BEING PROVIDED WITH TWO INNER ROLLERS WHICH ARE GUIDED IN SAID INNER TRACKWAY AND FURTHER CHARACTERIZED IN THAT AT LEAST ONE OF THE TWO OUTER ROLLERS IS CONTINUOUSLY ENGAGED WITH THE OUTER TRACKWAY, AND FURTHER CHARACTERIZED IN THAT PORTIONS OF THE OUTER TRACKWAY CROSS EACH OTHER IN THE VERTICAL PLANE EXTENDING MIDWAY BETWEEN THE STRAIGHT-LINE PORTIONS OF THE CHAINS, THE SPACING OF SAID OUTER TRACKWAY BEING ARRANGED WITH RESPECT TO THE PATH OF SAID CHAIN SO THAT SAID OUTER ROLLERS ARE GUIDED WITH THEIR AXES HELD IN A SUBSTANTIALLY HORIZONTAL PLANE.