Retractable wall apparatus and drive mechanism therefor

Claim 1

IN A RETRACTABLE WALL APPARATUS, A CONVEYOR EXTENDING IN A GENERALLY HORIZONTAL DIRECTION AND ADAPTED TO HAVE ARTICLES SUPPLIED THERETO AT A PLURALITY OF POINTS SPACED ALONG THE CONVEYOR, RETRACTABLE WALL MEANS DISPOSED ALONG EACH SIDE OF THE CONVEYOR TO FORM A SIDE GUARD FOR THE CONVEYOR, SAID RETRACTABLE WALL MEANS HAVING INNER AND OUTER ENDS, MEANS MOUNTING THE RETRACTABLE WALL MEANS TO PERMIT MOVEMENT THEREOF AND TO PERMIT THE CONVEYOR TO BE LOADED WITH ARTICLES AT VARIOUS POSITIONS, A TROLLEY SECURED TO THE OUTER ENDS OF SAID RETRACTABLE WALL MEANS AND ADAPTED FOR TRAVEL LONGITUDINALLY OF THE CONVEYOR, CABLE-LIKE MEANS HAVING ONE END SECURED AT THE TROLLEY AND MEANS FORMING A CONNECTION BETWEEN THE OTHER END OF THE CABLE-LIKE MEANS TO THE INNER ENDS OF THE WALL MEANS TO THEREBY FORM A CONTINUOUS LOOP, AND MEANS DIRIVING SAID RETRACTABLE WALL MEANS FROM A SINGLE POWER SOURCE PROVIDED ON THE TRACTOR SO THAT SAID RETRACTABLE WALL MEANS IS SELECTIVELY DRIVEN POSITIVELY IN EITHER DIRECTTION ALONG SAID CONVEYOR.