Expansible chair

Claim 1

EXPANSIBLE FURNITURE COMPRISING: A FIRST SEAT MEMBER HAVING AN UPPER SURFACE ADAPTED TO SUPPORT A PERSON, AND OPPOSITE LONGITUDINAL SIDE FACES; FIRST GUIDE MEANS ON EACH SIDE FACE FOR SLIDABLY SUPPORTING AN EXPANSION SEAT MEMBER; EXPANSION SEAT MEMBERS, EACH HAVING AN UPPER SURFACE ADAPTED TO SUPPORT A PERSON, AND OPPOSITE LONGITUDINAL SIDE FACES; SECOND GUIDE MEANS ON AT LEAST ONE SIDE FACE OF EACH EXPANSION SEAT MEMBER FOR LONGITUDINAL SLIDING COACTION WITH THE FIRST GUIDE MEANS ON ONE SIDE FACE OF SAID FIRST SEAT MEMBER TO REMOVABLY MOUNT SAID EXPANSION SEAT MEMBERS ON SAID FIRST SEAT MEMBER, THE COACTING GUIDE MEANS ON THE SIDE FACES OF THE FIRST SEAT MEMBER AND THE EXPANSION SEAT MEMBERS BEING ARRANGED SO THAT THE UPPER SURFACES OF THE FIRST SEAT MEMBER AND THE EXPANSION SEAT MEMBERS ARE GENERALLY HORIZONTALLY ALIGNED; THIRD GUIDE MEANS EXTENDING TRANSVERSELY ACROSS SAID FIRST SEAT MEMBER; BACK REST MEMBERS, EACH HAVING FOURTH GUIDE MEANS AT THE LOWER PORTION THEREOF SLIDABLY COOPERATING WITH SAID THIRD GUIDE MEANS SO AS TO MOUNT SAID BACK REST MEMBERS ON SAID FIRST SEAT MEMBER FOR MOVEMENT TOWARD AND AWAY FROM ONE ANOTHER BETWEEN AN EXPANDED AND A CONTRACTED POSITION; A BACK REST INSERT MEMBER, SAID BACK REST INSERT MEMBER BEING RECEIVED BETWEEN SAID BACK REST MEMBERS WHEN THEY ARE IN THE EXPANDED POSITION; FIFTH GUIDE MEANS AT THE LOWER PORTION OF SAID BACK REST INSERT MEMBER AND COOPERABLE WITH SAID FIRST GUIDE MEANS TO MOUNT SAID BACK REST INSERT MEMBER ON SAID FIRST SEAT MEMBER; ARM RESTS, ONE FOR EACH OF THE OUTERMOST BACK REST MEMBERS, AND EACH HAVING SIXTH GUIDE MEANS ON THE REAR SURFACE THEREOF; AND SEVENTH GUIDE MEANS ON EACH OF THE OUTERMOST BACK REST MEMBERS SLIDABLY COOPERATING WITH SAID SIXTH GUIDE MEANS TO REMOVABLY MOUNT SAID ARM RESTS ON SAID OUTERMOST BACK REST MEMBERS.