Scaffold

Claim 1

IN COMBINATION, A PLURALITY OF LATERALLY SPACED RAILS RUNNING GENERALLY PARALLEL TO ONE ANOTHER TO FORM AN OUTDOOR TRACK ALONG THE SIDE OF A STRUCTURE TO BE WORKED ON, SIDE RAILS CONNECTED BY RUNG MEANS AND FORMING FOUR LADDERS ARRANGED AS TWO PAIRS, THE LADDERS OF EACH PAIR BEING PLACED CLOSE TOGETHER SIDE-BY-SIDE AND SPACED FROM THOSE OF THE OTHER PAIR SIMILARLY PLACED, EACH PAIR HAVING ITS LOWER ENDS FIXED TO A SEPARATE PLATFORM LYING OVER AND EXTENDING FROM RAIL TO RAIL, WHEELS AS PARTS OF TRUCKS EACH WITH A BODY SECURED BENEATH ONE OF SAID PLATFORMS AND ADAPTED TO TRAVEL ALONG THE RAILS AS THE LADDERS ARE MOVED ALONG SAID STRUCTURE, EACH RAIL OF THE TRACK IS FORMED WITH A BASE PORTION ON WHICH THE TRUCK WHEELS CAN TRAVEL, AND FLANGES OVERLYING SAID BASE PORTION AND SAID WHEELS TO PREVENT OVERTURNING OF THE SCAFFOLD OR OTHER UNDESIRED UPWARD DISPLACEMENT OF THE WHEELS, NORMALLY HORIZONTAL AXLES ON WHICH THE WHEELS TURN, MEANS CONNECTING SAID PLATFORMS, SLEEVE UPSTANDING FROM SAID PLATFOMS WITH THE LOWER END PORTIONS OF SAID SIDE RAILS RECEIVED THEREIN, EACH SLEEVE BEING HOLLOW WITH END AND SIDE WALLS AND HAVING ITS LOWER END RIGIDLY CONNECTED TO ITS PLATFORM, THE END WALLS OF EACH SLEEVE EXTENDING THE FULL LENGTH THEREOF, ONE OF ITS SIDE WALLS TERMINATING SHORT OF SAID END WALLS AND ONLY THE OTHER SIDE WALL BEING BIFURCATED FOR PASSAGE OF RUNG MEANS BETWEEN THE BIFURCATIONS THEREOF, MEANS TO HOLD EACH PAIR OF LADDERS IN COPLANAR RELATIONSHIP, MEANS TO BRACE THE PAIRS WITH RESPECT TO ONE ANOTHER SO THAT THEY STAND UPRIGHT, PLANKS LATERALLY FREE FROM ONE ANOTHER EXTENDING BETWEEN SELECTED RUNG MEANS OF ONE PAIR AND SELECTED RUNG MEANS OF THE OTHER PAIR, POSITIONED TO PROVIDE A WORKING SURFACE AND PRODUCE A SCAFFOLD.