Sliding type lateral door, more particularly for motor-car body

Claim 1

IN A MOTOR VEHICLE HAVING A LATERALLY FACING DOOR OPENING, AN ELONGATED OVERHEAD GUIDE RAIL EXTENDING ALONG THE SIDE OF SAID VEHICLE ABOVE SAID OPENING, SAID GUIDE RAIL HAVING A CURVATURE PORTION INCLUDING INWARDLY CURVED SECTIONS ADJACENT THE REAR AND FRONT OF SAID DOOR OPENING AND AN OUTWARDLY CURVED SECTION AT THE MIDDLE OF SAID DOOR OPENING, AN UPWARDLY EXTENDING STATIONARY GUIDE POST FIXED AT THE BOTTOM AND REAR OF SAID DOOR OPENING IN ALIGNED RELATIONSHIP WITH SAID REAR CURVED SECTION OF SAID GUIDE RAIL, A DOOR SLIDABLE ALONG SAID GUIDE RAIL BETWEEN A CLOSED POSITION ACROSS SAID OPENING AND AN OPEN POSITION ALONG THE SIDE OF SAID VEHICLE TO THE REAR OF SAID DOOR OPENING, A PAIR OF UPPER ROLLERS MOUNTED ON SAID DOOR FOR SUPPORTING SAID DOOR FROM ABOVE ON SAID GUIDE RAIL, A U-SHAPED GUIDEWAY FIXED TO THE BOTTOM OF SAID DOOR AND FACING DOWNWARDLY TO GUIDINGLY RECEIVE SAID POST, SAID GUIDEWAY HAVING AN INTERMEDIATE CONTOUR SECTION WITH A CURVATURE AWAY FROM SAID DOOR CORRESPONDING TO SAID OUTWARDLY CURVED SECTION OF SAID TRACK, WHEREBY SAID DOOR IS TRANSVERSELY SHIFTED AWAY FROM THE SIDE OF SAID VEHICLE DURING THE OPENING AND CLOSING OPERATIONS TO FACILITATE THE SAME AND SHIFTED TOWARD SAID SIDE WHEN SAID OPEN AND CLOSED POSITIONS ARE APPROACHED.