ND44 Hospital privacy lock

Emergency turn in lever outside; push button in lever inside; springlatch
In unlocked state latch is retracted by either lever
Outside lever is made inoperative by pushing button on inside lever
Rotating inside lever retracts latch and releases button unlocking outside lever; closing door also unlocks preventing lockout
Emergency unlock: rotating emergency turn in outside lever releases button to unlock
Inside lever always free for immediate egress