As the door is opened the leaf fitted to the door (in yellow) rides up the spiral knuckle raising the door a few millimetres. The door tends to close ifself because of the gravity.
This hinge type is use for cases:
Thick or uneven door ways
When an easily removable door is wanted
Selfclosing door
For more about rising butt hinge see:
https://www.absolutehardware.co.uk/bl...

STEP files of this video:
http://www.mediafire.com/file/r4cvvsh...
Inventor files of this video:
http://www.mediafire.com/file/7buz6eg...