Folding Structure - YouTube https://www.youtube.com/watch?v=PUEKtsOlLyw&lc=UgwEKKfbS6z0IlrW1gh4AaABAg
>Getting 180 degrees of output motion from only 30 degrees of input motion.
>The input can also be controlled with a linear actuator of relatively limited travel.
>The "simple hinge" crowd may not see its advantages in certain applications, but I do.
>I've had to deal with linkages in many of my designs over the years.