I invented this mechanism, which was patented by Structural Graphics,over a million have sold so far.

The rendering was done for Red Paper Plane, a very cool site for designing 3d paper mechanisms online,  They can manufacture and ship in only a few days, a remarkable feat, am very impressed with the programming and production logistics that made this possible.  Most of the 3d models and rendering on the site were done by me. Link:  Red Paper Plane