Hinge construction and method for elevating a chair seat

Claim 1

IN COMBINATION; FRAME MEANS AND A PLATEFORM ADJACENT SAID FRAME MEANS, HINGE MEANS LOCATED BETWEEN OPPOSITE SIDES OF SAID FRAME MEANS AND PLATFORM AND CONNECTED TO SAID FRAME MEANS AND PLATFORM, AND OPERABLE FOR SUPPORTING SAID PLATFORM IN AN ELEVATED POSITION ON SAID FRAME MEANS, EACH SAID HINGE MEANS COMPRISING A FIRST LEAF FIXEDLY MOUNTED ON SAID FRAME MEANS AND HAVING A HINGED SIDE TOWARDS THE CENTER OF SAID FRAME MEANS, A SECOND LEAF FIXEDLY MOUNTED ON THE UNDERSIDE OF SAID PLATFORM AND HAVING A HINGED SIDE TOWARDS THE CENTER THEREOF, A LOWER LEAF HAVING A FIRST HINGED SIDE PIVOTALLY JOINED TO THE HINGED SIDE OF SAID FIRST LEAF AND HAVING A SECOND HINGED SIDE, AN UPPER LEAF AND HAVING A FIRST HINGED SIDE PIVOTALLY JOINTED TO THE LOWER SIDE OF SAID SECOND LEAF AND ALSO HAVING A SECOND HINGED SIDE PIVOTALLY JOINTED TO THE SECOND HINGED SIDE OF SAID LOWER LEAF, HINGE PINS EXTENDING THROUGH SAID HINGED SIDES FOR PIVOTALLY JOINING SAID LEAVES AT SAID HINGED SIDES THEREOF, SAID SECOND HINGED SIDES OF SAID UPPER AND LOWER LEAVES BEING MOVABLE INWARDLY ROWARD THE CENTER OF SAID FRAME MEANS TO COLLAPSE SAID HINGE MEANS AND TO DISPOSE SAID PLATFORM CLOSELY ADJACENT SAID FRAME MEANS, SAID SECOND HINGED SIDES OF SAID UPPER AND LOWER LEAVES BEING MOVABLE OUTWARDLY AWAY FROM THE CENTER OF SAID FRAME MEANS TO ELEVATE SAID PLATFORM AND TO CAUSE SAID FIRST AND SECOND LEAVES TO FORM ACUTE ANGLES WITH SAID UPPER AND LOWER LEAVES RESPECTIVELY, WHILE SAID UPPER AND LOWER LEAVES FORM A PREDETERMINED ANGLE WITH EACH OTHER, AND ABUTMENT MEANS ON SAID LEAVES ADJACENT THE HINGED SIDES THEREOF FORMING ABUTMENT AREAS WHICH ABUT AND STOP THE ROTATION OF SAID LEAVES WHEN SAID LEAVES ARE IN SAID LAST-MENTIONED POSITION, THEREBY FIXEDLY SUPPORTING SAID PLATFORM IN SAID ELEVATED POSITION, THE SAID ABUTMENT MEANS PERTAINING TO ALL OF SAID HINGED SIDES ABUTTING SIMULTANEOUSLY.