Railway car having a vertically movable load support platform

Claim 1

IN A RAILWAY CAR, A FRAME INCLUDING A PAIR OF SIDE SILLS HAVING OPEN CENTERS AND TOP PORTIONS, A LOAD PLATFORM SUPPORTED ON SAID FRAME, TRUNNION MEANS OPERATIVELY SECURED BETWEEN SAID FRAME AND SAID LOAD PLATFORM TO PERMIT CONTROLLED ARCUATE AND VERTICAL MOVEMENT OF SAID LOAD PLATFORM RELATIVE TO SAID FRAME, A PAIR OF SPACED PARALLEL SUPPORT MEMBERS FOR SAID LOAD PLATFORM EXTENDING LONGITUDINALLY THEREOF BELOW SAID LOAD PLATFORM, EACH SAID SUPPORT MEMBER BEING TELESCOPICALLY RECEIVED IN A SAID SIDE SILL FOR ONLY VERTICAL MOVEMENT THEREIN, A PAIR OF PARALLEL LONGITUDINALLY INCLINED CAM PLATE MEANS PROVIDED ON EACH OF SAID SUPPORT MEMBERS WITH ONE PLATE BEING ADJACENT EACH END THEREOF, ROLLER MEANS OPERATIVELY ENGAGING SAID CAM PLATES MEANS TO PROVIDE VERTICAL MOVEMENT OF SAID SUPPORT MEMBERS RELATIVE TO SAID FRAME BY LONGITUDINAL MOVEMENT OF SAID ROLLER MEANS, SAID ROLLER MEANS BEING ADAPTED TO DEPOSIT SAID LOAD PLATFORM ON SAID FRAME FOR NORMAL LOAD CARRYING ACTION AND TO RAISE SAID LOAD PLATFORM BY SAID SUPPORT MEMBERS BY CAM ACTION OF SAID ROLLER MEANS ENGAGING SAID CAM PLATES MEANS, AND UNITARY ACTING CONTROL MEANS CARRIED BY SAID FRAME AND OPERATIVELY ENGAGING SAID ROLLER MEANS TO MOVE THEM LONGITUDINALLY OF SAID FRAME SIMULTANEOUSLY AND LIFT SAID LOAD PLATFORM.