This sounds ingenious. But what's it for, and how does it work?
Two pairs of first and second legs compromised of angular members having top portions and lower ends, said first and second legs connected at top portions of first and second legs at joints, wherein the joints further comprise pivots, and further comprising spacers located at the pivots, said spacers spacing the first and second legs a predetermined distance apart from one another…
For a fuller description and an illustration, you will have to go here.
[Thanks to Martin G]