Folding sofa bed structure

Claim 1

IN A FOLDING SOFA BED STRUCTURE INCLUDING A STATIONARY FRAME, A FOLDING FRAME SUSPENDED THEREFROM FOR PROJECTING AND RETRACTING MOVEMENT RELATIVE TO THE STATIONARY FRAME, AND COMPRISING A HEAD SECTION, A MAIN INTERMEDIATE FOLDING FRAME SECTION, A RELATIVELY SHORT INTERMEDIATE FRAME SECTION, AND A FRAME FRONT END FOOT SECTION, SAID SECTIONS BEING ARRANGED END TO END WITH ADJACENT ENDS PIVOTALLY CONNECTED FOR SELECTIVE UNFOLDING PROJECTING MOVEMENT TO A COPLANAR BED-FORMING POSITION AND FOR FOLDING RETRACTING MOVEMENT TO A FOLDED POSITION IN WHICH THE FOOT SECTION IS TURNED UPSIDE DOWN ABOVE THE MAIN INTERMEDIATE SECTION BUT IS SPACED THEREFROM BY THE SHORT INTERMEDIATE SECTION TO PROVIDE FOR A FOLDED MATTRESS BETWEEN THE MAIN INTERMEDIATE SECTION AND THE FOOT SECTION, THERE BEING LINK AND PIN MECHANISM BETWEEN THE FOOT SECTION AND THE MAIN INTERMEDIATE SECTION WHEREBY THE FOOT SECTION IS POSITIVELY MOVED TOWARD THE MAIN SECTION AS THE FOOT SECTION AND SHORT INTERMEDIATE SECTION ARE SWUNG UPWARDLY AND INWARDLY DURING FOLDING OF THE BED, SAID MECHANISM BEING CHARACTERIZED BY UPRIGHT BELL CRANK LEVERS FULCRUMED AT SPACED POINTS ON THE MAIN INTERMEDIATE SECTION, A LINK INTERCONNECTING SAID LEVERS AND HAVING AN ELONGATED SLOT AT ONE END RECEIVING A PIN ON ONE ARM OF ONE OF SAID LEVERS, A PIN AT THE OTHER END OF SAID LINK RECEIVED IN A SLOT IN ONE ARM OF THE OTHER OF SAID LEVERS, AND INDIVIDUAL ANCHOR LINKS BETWEEN THE OTHER ARMS OF SAID LEVERS AND SAID HEAD SECTION AND FOOT SECTION RESPECTIVELY WHEREBY THE UNANCHORED ARM OF THE LEVER ANCHORED TO THE HEAD SECTION EXERTS PULL THROUGH SAID LINK ON THE UNANCHORED ARM OF THE OTHER LEVER AS THE HEAD SECTION IS RETRACTED BUT SAID LEVERS MAY ROTATE RELATIVE TO EACH OTHER DURING INITIAL FOLDING OF FRAME SECTIONS WHILE THE HEAD SECTION IS STATIONARY.