Coke oven door handling machine

Claim 1

A COKE OVEN DOOR OPERATING MACHINE, COMPRISING: A CARRIAGE MOVABLE ALONG A COKE OVEN BATTERY FROM CHAMBER TO CHAMBER IN POSITION TO REMOVE AND REPLACE COKE OVEN DOORS FROM DOOR FRAMES OF SAID CHAMBERS; CAM TRACK MEANS IMMOVABLY MOUNTED ON THE CARRIAGE FOR CARRYING THE WEIGHT OF THE DOORS WHILE GUIDING AND ELEVATING THE DOORS IN THEIR MOVEMENT TO AND FROM THEIR DOOR FRAMES IN SEATING AND UNSEATING THE DOORS WITH RESPECT TO THE INDIVIDUAL DOOR FRAMES; CAM-FOLLOWER MEANS OPERATIVELY ASSOCIATED WITH SAID CAM TRACK MEANS; A DOOR CARRIER HAVING MEANS FOR SUPPORTING SAID DOORS INDIVIDUALLY THEREON IN VERTICAL POSITION AND MEANS FOR SUPPORTING THE DOOR CARRIER AT ONLY A SINGLE POINT FROM SAID CAM-FOLLOWER MEANS; RETRACTIVE CARRIAGE MEANS, SEPARATE AND DISTINCT FROM SAID CAM TRACK MEANS, FOR MOVING THE DOOR TOWARDS AND AWAY FROM THE FURNACE WITH RECTILINEAR MOVEMENT OF SAID DOOR CARRIER AND THE CAM-FOLLOWER MEANS ALONG THE CAM TRACK MEANS TO AND FROM THE INDIVIDUAL DOOR FRAMES FOR THE DOORS; MEANS FOR MOVING THE RETRACTIVE CARRIAGE MEANS TODWARDS AND AWAY FROM THE FURNACE; AND VERTICALLY SPACED SLIDING CONNECTIONS BETWEEN THE RETRACTIVE CARRIAGE MEANS AND THE DOOR CARRIER FOR HOLDING THE DOOR CARRIER VERTICAL WHILE ACCOMMODATING VERTICAL MOVEMENT OF THE DOOR CARRIER AS IT IS BEING MOVED TO AND FROM THE FURNACE SO AS TO MAINTAIN THE DOOR IN A VERTICAL PLANE IN ALL POSITIONS OF THE MOVEMENTS OF THE DOOR TO AND FROM THE FURNACE, WHEREBY THE DOOR IS SUSTAINED BY THE CAM TRACK MEANS FOR VERTICAL MOVEMENT AND IS LATERALLY RESTRAINED BY THE RETRACTIVE CARRIAGE MEANS, AS THE CAM-FOLLOWER MEANS RISES AND FALLS DURING MOVEMENT TOWARD AND AWAY FROM THE FURNACE.