broken lines when seat back 14 is dumped about pivot member 15 the distance between cable attachment 23 and the point of cable contact with cam 24 increases this causes arm rest 16 to rotate relative to seat back 14 as the arm rest rotates the length of cable in contact with the cam decreases to compensate for the increased distance from anchor 23 to cam 24 referring now to fig5 and 6 another embodiment of the automatic arm rest lift mechanism of this invention is shown in this embodiment a link 40 is attached to seat cushion 12 by a pin 42 and to arm rest 16 by a pin 44 pins 42 and 44 extend through apertures at each end of the link 40 the link 40 seat cushion 12 seat back 14 and arm rest 16 cooperate to form a four bar linkage pins 42 and 44 are located forward of pivot members 15 and 18 respectively when the seat back 14 is rotated forward about the back pivot 15 the link 40 exerts an upward force on the arm rest 16 creating a counterclockwise moment about pivot 18 to rotate arm rest 16 upward the aperture in link 40 at pin 42 includes a slot 46 which enables.