Sofa bed mechanism

Claim 1

IN A SOFA BED MECHANISM, A FRAME HAVING REAR, INTERMEDIATE AND FORWARD SECTIONS SUCCESSIVELY PIVOTALLY CONNECTED, SAID SECTIONS BEING FOLDABLE BETWEEN COLLAPSED AND EXTENDED POSITIONS, A LINKAGE SYSTEM INTERCONNECTING SAID SECTIONS FOR GUIDING AND CONTROLLING MOVEMENT OF SAID SECTIONS BETWEEN THE COLLAPSED AND EXTENDED POSITIONS INCLUDING CONTROL LEVER MEANS HAVING ONE END PIVOTALLY AND SLIDABLY CONNECTED TO SAID FORWARD SECTION AND THE OTHER END PIVOTALLY CONNECTED AT THE INTERCONNECTION BETWEEN SAID REAR AND INTERMEDIATE SECTIONS, GUIDE LEVER MEANS HAVING ONE END PIVOTALLY CONNECTED AT THE INTERCONNECTION BETWEEN SAID INTERMEDIATE AND FORWARD SECTIONS AND THE OTHER END PIVOTALLY AND SLIDABLY CONNECTED TO SAID REAR SECTION, AND A CONNECTING LINK PIVOTALLY INTERCONNECTING SAID CONTROL LEVER BEING CURVED BETWEEN SAID THEIR ENDS, SAID CONTROL LEVER BEING CURVED BETWEEN SAID ONE END THEREOF AND ITS PIVOTAL CONNECTION WITH SAID CONNECTING LINK IN A DIRECTION TO PROJECT BELOW THE PLANE OF SAID REAR, INTERMEDIATE AND FORWARD SECTIONS IN THE EXTENDED POSITION, SAID GUIDE LEVER ASSUMING A POSITION SUBSTANTIALLY PARALLEL WITH SAID REAR, INTERMEDIATE AND FORWARD SECTIONS IN THE EXTENDED POSITION, AND SAID CONNECTING LINK PROJECTING FROM SAID GUIDE LEVER BELOW THE PLANE OF THE EXTENDED BED FRAME SECTIONS TO ITS CONNECTION WITH THE CONTROL LEVER.