This hinge may be used in combination with a variety of items such as skis or a guitar to make them collapsible for easy storage and transportation.
The hinge includes a 6 bar mechanism enables the hinge to rotate 180 degrees. It contains 5 movable links, 5 revolution joints and 2 prismatic joints.
The two bodies (transparent yellow and transparent green) of the hinge are placed in the holes of the blue item and are fixed with screws.
In the unfolded position, the two halves of the item are secured by a device that consits of two orange pins and a red eccentric shaft.
The video shows the sequential process of unfolding, securing, unsecuring and folding the blue item.
This animation is made based on patent US4780929:
https://patents.google.com/patent/US4...

STEP files of this video:
https://www.mediafire.com/file/3ryhid...
Inventor files of this video:
https://www.mediafire.com/file/xvfjn0...