Extensible pull out or davenport beds

Claim 1

IN COMBINATION, A CHASSIS ADAPTED TO BE FIXED TO A SOFA FRAME, A MAIN LEVER PIVOTED TO SAID CHASSIS, SPRING MEANS TO CONNECT SAID LEVER TO SAID CHASSIS, A BELL CRANK PIVOTED TO SAID CHASSIS, A BED FRAME COMPRISING A HEAD SECTION PIVOTED TO SAID BELL CRANK, AN INTERMEIDATE SECTION PIVOTED TO SAID HEAD SECTION, A FOLD SECTION PIVOTED TO SAID INTERMEDIATE SECTION, A FOOT SECTION PIVOTED TO SAID FOLD SECTION, A FIRST LINK PIVOTED TO SAID HEAD SECTION, A SECOND LINK INTERCONNECTING SAID BELL CRANK AND FIRST LINK, SAID MAIN LEVER BEING PIVOTED TO SAID FIRST LINK BETWEEN THE ENDS OF THE LATTER, A SECOND BELL CRANK PIVOTED TO SAID INTERMEDIATE SECTION AND HAVING A FIRST ARM PIVOTED TO SAID FIRST LINK, SAID INTERMEDIATE SECTION BEING FORMED WITH A SLOT, SAID SECOND BELL CRANK BEING PROVIDED WITH A SECOND ARM CARRYING A PIN, A THIRD LINK CARRYING A PIN SLIDABLE IN THE SLOT IN SAID INTERMEDIATE SECTION, AND BEING FORMED WITH A SLOT SLIDABLY RECEIVING THE PIN ON SAID SECONE ARM OF SAID SECOND BELL CRANK, A FOURTH LINK PIVOTED TO THE PIN ON SAID THIRD LINK, AND ALSO PIVOTED TO SAID FOLD SECTION.