Hinge fitting for adjustable back rests, especially for motor vehicles

Claim 1

IN A HINGE FOR FITTING ADJUSTABLY CONNECTING A SEAT AND A BACK REST, IN COMBINATION, A FIRST HINGE MEMBER ADAPTED TO BE CONNECTED TO SAID SEAT; A SECOND HINGE MEMBER ADATPED TO SUPPORT A BACK REST AND ARTICULATELY MOUNTED ON SAID FIRST HINGE MEMBER FOR MOVEMENT JOINTLY WITH SAID BACK REST BETWEEN A FORWARDLY WITHDRAWN AND A SINGLE REAR OPERATIVE POSITION; SETTING MEANS FOR ADJUSTING SAID SINGLE OPERATIVE POSITION OF SAID SECOND HINGE MEMBER AND BACK REST; RELEASABLE LOCKING MEANS COOPERATING WITH SAID HINGE MEMBERS AND MOVABLE BETWEEN A RELEASED POSITION IN WHICH SAID HINGE MEMBERS ARE FREELY MOVABLE RELATIVE TO EACH OTHER AND A LOCKING POSITION IN WHICH SAID HINGE MEMBERS ARE PREVENTED FROM MOVING RELATIVE TO EACH OTHER; HOLDING MEANS FOR AUTOMATICALLY HOLDING SAID LOCKING MEANS IN SAID RELEASED POSITION DURING THE ENTIRE MOVEMENT OF SAID SECOND HINGE MEMBER AND BACK REST WHEN SAID BACK REST IS IN SAID SINGLE PREADJUSTED REAR OPERATIVE POSITION THEREOF BETWEEN SAID FORWARDLY WITHDRAWN POSITION AND SAID SINGLE PREADJUSTED REAR OPERATIVE POSITION AND WHILE SAID HEAD REST IS IN AID FORWARDLY WITHDRAWN POSITION THEREOF, SO THAT SAID LOCKING MEANS IS PERMITTED TO MOVE INTO AND BE IN SAID LOCKING POSITION THEREOF ONLY WHEN SAID BACK REST IS IN SAID SINGLE PREADJUSTED REAR OPERATIVE POSITION THEREOF; AND ACTUATING MEANS FOR AUTOMATICALLY MOVING SAID LOCKING MEANS FROM SAID RELEASED POSITION INTO SAID LOCKING POSITION THEREOF WHEN SAID SECOND HINGE MEMBER AND BACK REST REACH SAID OPERATIVE POSITION THEREOF.