Chair structure with adjustable back

Claim 1

A CHAIR STRUCTURE WITH AN ADJUSTABLE BACK COMPRISING A MAIN FRAME HAVING A PAIR OF LATERALLY SPACED PARALLEL TUBULAR MEMBERS ADAPTED TO BE MOUNTED ON A SUITABLE SUPPORT, A SUPPLEMENTAL FRAME HAVING A PAIR OF LATERALLY SPACED TUBULAR RODS SLIDABLE TELESCOPICALLY IN SAID TUBULAR MEMBERS RESPECTIVELY, A CUSHION UNIT MOUNTED ON AND SUBSTANTIALLY COVERING SAID MAIN FRAME, A SECOND CUSHION UNIT, HINGE MEANS PROVIDING A CONNECTION BETWEEN SAID SECOND CUSHION UNIT AND SAID MAIN FRAME WHEREBY SAID SECOND CUSHION UNIT MAY BE ROCKED FROM AN UPRIGHT POSITION CONSTITUTING A CHAIR BACK FOR THE FIRST CUSHION UNIT TO A POSITION IN ALIGNMENT THEREWITH TO CONSTITUTE A BED, SAID HINGE MEANS COMPRISING A MEMBER RIGID WITH THE MAIN FRAME, A MEMBER RIGID WITH THE SUPPLEMENTAL FRAME AND ALIGNED WITH THE FIRST HINGE MEMBER WHEN THE FRAMES ARE ARRANGED AS A BED, AND A PIVOTAL CONNECTION BETWEEN THE ADJACENT ENDS OF SAID MEMBERS, LINK MEANS PROVIDING A CONNECTION BETWEEN SAID SECOND CUSHION UNIT AND SAID SUPPLEMENTAL FRAME WHEREBY FORE AND AFT MOVEMENT OF THE SUPPLEMENTAL FRAME IMPARTS ROCKING MOVEMENT TO SAID SECOND SPRING UNIT, AND LATCHING MEANS FOR RELEASABLY SECURING SAID SUPPLEMENTAL FRAME IN A SELECTED POSITION OF ADJUSTMENT.