Koenigsegg door system
The doors of the Koenigsegg CCX open using the “dihedral synchro-helix door actuation” system. You can see this movement on the video
Mondo Spider walking machine
This walking machine is known as the Mondo Spider. More information is available at Mondospider.com.
The leg of the mondo spider has the topology known as a Stephenson six-bar and is described in US Patent 6,260,862 awarded to Joseph Klann. Access it through the link:
https://patents.google.com/patent/US6260862B1/en
Wikipedia calls this the Klann linkage which is described here:
http://en.wikipedia.org/wiki/Klann_Linkage
Theo Jansen’s walking machine
Theo Jansen builds amazing walking machines.
Each leg is an eight-bar linkage. The Wolfram Demonstration Project models this linkage in a Mathematica notebook. See the link:
http://demonstrations.wolfram.com/ATheoJansenWalkingLinkage/
[vimeo]http://vimeo.com/1242383[/vimeo]