Sofa bed

Claim 1

A SOFA BED COMPRISING, IN COMBINATION: A BASE HAVING END RAILS, A REAR RAIL, AND A FRONT RAIL; A FOLDING BED FRAME HAVING AN INNER BED SECTION; A MOUNTING LINK FIXED TO EACH END RAIL; AND SUPPORTING LINK MEANS PIVOTALLY CONNECTED TO SAID END RAILS AND TO SAID INNER BED SECTION TO MOVE THE LATTER BETWEEN A BED POSITION ABOVE THE FRONT RAIL AND A FOLDED POSITION BEHIND AND A SUBSTANTIAL DISTANCE BELOW A PLANE AT THE TOP OF THE FRONT RAIL, SAID LINK MEANS INCLUDING A PAIR OF REAR LINKS EACH BEING PIVOTALLY MOUNTED ON A MOUNTING LINK, SAID REAR LINKS AND FRONT LINKS IN FOLDED SUPPORTING POSITION EXTENDING DOWNWARDLY AND REAR LINKS IN FOLDED POSITION EXTENDING DOWNWARDLY AND REARWARDLY, AND THEIR LENGTHS AND PIVOTAL CONNECTIONS TO THE BASE AND THE INNER BED SECTION BEING SO RELATED THAT DURING A FIRST PART OF THEIR MOVEMENT TOWARD BED POSITION THE FRONT LINKS SWING FORWARDLY TO A NEARLY VERTICAL POSITION AS THE REAR LINKS SWING FORWARDLY PAST HORIZONTAL DEAD CENTER AND THE INNER BED SECTION ASSUMES A STEEPLY INCLINED POSITION, WHILE DURING A SECOND PART OF SAID MOVEMENT SAID REAR LINKS SWING UPWARDLY AND REARWARDLY TO ELEVATE THE REAR OF THE INNER BED SECTION AND THE FRONT LINKS SWING REARWARDLY TO LOWER THE FRONT OF SAID BED SECTION, SAID REAR AND FRONT LINKS CONVERGING UPWARDLY IN BED POSITION; FIRST SPRING MEANS CONNECTED BETWEEN SAID MOUNTING LINKS AND SAID FRONT LINKS CONSTANTLY URGING SAID FRONT LINKS TOWARD BED POSITION; AND SECOND SPRING MEANS CONNECTED BETWEEN SAID REAR LINKS AND SAID FRONT LINKS FOR CONSTANTLY URGING SAID REAR LINKS TOWARD BED POSITION, SAID SECOND SPRING MEANS SWINGING SAID FRONT LINKS REARWARDLY DURING SAID SECOND PART OF SAID MOVEMENT.