This spherical four-bar linkage concept by Kaustubh Sonawale guides the wings of the Icon A5 in the movement shown in the animation.
This is a spherical four-bar linkage concept by Kaustubh Sonawale designed to fold the wings of an Icon A5 small aircraft.
Kaustubh Sonawale designed this four-bar linkage to move a truck spare tire from a stowed position to the deployed position.
This site has photographs of a large number of devices used to teach physics. It is fascinating.
Select the link: http://physics.kenyon.edu/EarlyApparatus/index.html