Morgans wrote:


"Bill" wrote

Thank you for your analysis. As no one is trying to keep it a
secret, I'm surprised the design is not more well-known.

After looking at it again, the break in the central axle is after the
3rd member counting from the outsides. The 4th and 5th members are
then on their own axle that is one piece.

The back portion of the seat sliding forward against the front part of
the seat is also what keeps the "x" from spreading out too far when
you sit on it. Really clever.

So that "handle" on the back of the chair is helping to hold the whole
contraption together (without it, the chair would fall apart?)