I am planning to recover this old chair with some new fabric so the first order of business was to remove the cushions.
The bottom cushion is simply held on with screws.
But the seat back is a little more mystifying. I guessed that the wood buttons on the side of the chair somehow hid the mechanism that held the top of the cushion.
I popped off the buttons with the tip of a knife and sure enough there were screws that could be removed by an Allen wrench.
After removing the top screws the seat back was still not out of the frame. It swiveled but did not come out and I couldn’t see the any screws or buttons to hold it in.
I carefully spread the stiles and noticed the bottom of the seatback was held in by small dowels attached to the seat which were inserted into holes on each side.
I spread the stiles a little farther apart and one side popped out, then the other one.
Mystery solved. (See the Before and After here.)
Are you better at taking things apart or putting them together?