Convertible sofa-bed

Claim 1

IN A CONVERTIBLE SOFA-BED HAVING A FIXED FRONTBOARD, AN OPERATING MECHANISM WHICH PASSES OVER SAID FRONTBOARD WHEN IT IS OPERATED TO CONVERT SAID SOFA-BED FROM A BED TO A SOFA OR FROM A SOFA TO A BED, SAID OPERATING MECHANISM INCLUDING A PAIR OF SIDE-LINKAGES, ONE OF SAID LINKAGES BEING POSITIONED AT EACH SIDE OF SAID MECHANISM, A FOLDABLE MATTRESS-SUPPORT ATTACHED BETWEEN SAID LINKAGES, A PAIR OF INTERMEDIATE LEGS AND A PAIR OF FORWARD LEGS FOR UPHOLDING SAID MATTRESS-SUPPORT IN AN UNFOLDED POSITION FOR FORMING A BED, EACH OF SAID FORWARD LEGS BEING POSITIONED ADJACENT THE END OF SAID MATTRESS SUPPORT WHICH IS MOST DISTANT FROM SAID FRONTBOARD WHEN SAID MATTRESS SUPPORT IS IN ITS UNFOLDED POSITION, AND EACH OF SAID INTERMEDIATE LEGS BEING POSITIONED INTERMEDIATE SAID FRONTBOARD AND SAID FORWARD LEGS WHEN SAID MATRESS SUPPORT IS IN ITS UNFOLDED POSITION, EACH OF SAID INTERMEDIATE LEGS INCLUDING FIRST AND SECOND MEMBERS MOVABLY CONNECTED TOGETHER, ONE OF SAID MEMBERS BEING CONNECTED TO ONE OF SAID SIDE-LINKAGES, A GUIDING LINK PIVOTALLY CONNECTED TO SAID ONE SIDE-LINKAGES AND TO THE OTHER OF SAID MEMBERS, AND LINKAGE MEANS CONNECTED TO ONE OF SAID MEMBERS AND TO ONE OF SAID SIDE-LINKAGES FOR EFFECTING THE SIMULTANEOUS MOVEMENT OF SAID MEMBERS WITH RESPECT TO ONE ANOTHER AND WITH RESPECT TO SAID SIDE-LINKAGES TO SHORTEN SAID LEG IN RESPONSE TO FOLDING MOVEMENT OF SAID OPERATING MECHANISM.