Sedan chairs you only see them in museums nowadays, a relic from times gone by. Now you can see the car as a modern version of a sedan chair, a self-driving one even. That development and the associated improvement of the road network manoeuvred the sedan chair into oblivion.

Another angle is a chair with a recess in the back so that it is easier to lift. You often see these in catering- and school situations. See for example Duet and Duet II or Snorrenstoel.