Sofa-bed hinge mechanism

Claim 1

IN A SOFA-BED AND THE LIKE ARTICLE OF FURNITURE HAVING A SUPPORTING FRAME AND A SEAT MEMBER AND A BACK MEMBER SUPPORTED BY SAID FRAME AND MOVABLE RELATIVELY THERETO AND TO EACH OTHER FROM RELATIVE ANGULAR SEATING POSITION TO RELATIVE HORIZONTALLY ALIGNED BED POSITION AND VICE VERSA HINGE MEANS JOINING SAID SEAT MEMBER AND BACK MEMBER AT THEIR CONTIGUOUS EDGES AT OPPOSITE ENDS THEREOF, MEANS FOR ADJUSTING SAID SEAT MEMBER AND BACK MEMBER FROM SEATING POSITION TO BED POSITION AND VICE VERSA DURING THEIR RELATIVE HINGING MOVEMENT AND FOR UTIMATELY OPTIONALLY SUPPORTING SAID MEMBERS IN THEIR SEATING OR BED POSITION SAID ADJUSTING MEANS COMPRISING GUIDEWAY MEANS CARRIED BY SAID SUPPORTING FRAME AND EXTENDING BETWEEN POINTS ADJACENT TO THE FRONT AND REAR THEREOF, GUIDE FOLLOWER MEANS CARRIED BY SAID SEAT MEMBER AND COOPERATING WITH SAID GUIDEWAY MEANS, A LEVER PROVIDED WITH A FIXED FULCRAL PIVOT ON SAID SUPPORTING FRAME AND PIVOTALLY CONNECTED ADJACENT TO ONE OF ITS ENDS WITH SAID SEAT MEMBER, A LEVER HAVING A FIXED FULCRAL PIVOT ON SAID SUPPORTING FRAME AND PIVOTALLY CONNECTED ADJACENT TO ONE OF ITS ENDS WITH SAID BACK MEMBER, RESILIENT MEANS IN NORMALLY TENSED CONDITION HAVING ITS OPPOSITE ENDS CONNECTED RESPECTIVELY WITH SAID SEAT MEMBER ADJACENT TO SAID GUIDE FOLLOWER MEANS AND WITH SAID SUPPORTING FRAME SUBSTANTIALLY MIDWAY OF THE LENGTH OF SAID GUIDEWAY MEANS, WHEREBY SAID RESILIENT MEANS IS TENSED AND RELATIVELY RELAXED AS SAID GUIDEBER IS SHIFTED LONGITUDINALLY OF AND GUIDED BY SAID GUIDEWAY MEANS RELATIVE TO THE CONNECTION OF SAID RESILIENT