latch member 72 and slam latch 62 u2032 is considered a slam latch structure a cable structure is provided to release slam latch 62 u2032 so that the combined back and seat can move from the more inclined position of fig8 to the less inclined position of fig7 in this respect a lever 73 fig2 and 24 is mounted on frame member 19 and a cable 74 extends along side 32 and below side 32 and is received by slam latch 62 u2032 fig9 lever 73 is of the same construction as lever 67 which was described relative to fig2 and 22 in this respect it is normally dormant and after it has been actuated against the bias of a spring and released it will return to a dormant non actuated position thus when lever 73 is actuated slam latch 62 u2032 will open to the position analogous to that shown in fig1 a and as the patient leans forward his center of gravity will shift so that the combined seat and back will pivot in a counterclockwise direction in fig8 about the pin of hinges 44 and this movement is assisted by the expansion of springs 52 in spring units 49 the counterclockwise movement will continue until u shaped member 57 engages slam latch 62 whereupon the combined seat and back will again be positively latched in the less inclined position of fig7 from which the patient can leave the chair a lock arrangement 75 fig2 and 24 is mounted proximate to.