Elevator seats

Claim 1

IN A CHAIR HAVING A SEAT BOTTOM, A SEAT AND A POWER OPERATED SEAT ELEVATOR UNIT BY WHICH THE SEAT AND A POWRAISED AND TILTED FORWARDLY TO ASSIST A PERSON RISING FROM THE CHAIR, THE IMPROVEMENT BY WHICH THE SEAT ELEVATOR UNIT IS READILY REMOVABLE FROM THE CHAIR SO THAT THE CHAIR MAY BE USED WITH OR WITHOUT THE UNIT AND THE UNIT IS READILY SHIFTED FROM ONE CHAIR TO ANOTHER, SAID IMPROVEMENT COMPRISING THE STRUCTURE OF THE SEAT ELEVATOR UNIT IN WHICH THE UNIT IS MADE COMPACT WITH A LOW THIN PROFILE AND COMPRISES A BASE PANEL, A SEAT PANEL AND ELEVATOR MECHANISM BETWEEN SAID PANELS INCLUDING A MOTOR FOR RAISING SAID SEAT PANEL WITH RESPECT TO THE BASE PANEL, SAID PANELS HAVING SUBSTANTIALLY FLAT OUTER SURFACES WHICH ARE CLOSE TOGETHER WHEN THE SEAT PANEL IS IN LOWERMOST POSITION, MEANS REMOVABLY POSITIONING THE BASE PANEL ON THE SEAT BOTTOM, LINKAGES BETWEEN SAID BASE AND SEAT PANEL, MEANS COUPLING THE MOTOR TO THE LINKAGES TO MOVE THE LINKAGES BETWEEN AN UPWARDLY PROJECTING POSITION TO RAISE THE SEAT AND TO MOVE THE LINKAGES TO A LOWERMOST POSITION IN WHICH THE SEAT IS LOWERED AND IN WHICH SAID LINKAGES ARE ALL HORIZONTAL AND BETWEEN SAID BASE AND SEAT PANELS, THUS TO OCCUPY A MINIMUM VERTICAL DIMENSION, WHEREBY SAID UNIT HAS A LOW PROFILE WHEN THE SEAT UNIT IS IN SAID LOWERMOST POSITION, SAID LINKAGES COMPRISING A NON-PARALLELOGRAM LINKAGE SYSTEM TO TILT THE SEAT PANEL FORWARDLY IN THE COURSE OF ELEVATING IT.