Input: vertical gear receiving rotation from a motor (not shown).
The green door and blue upper plate are fixed together by two revolution joints (two roller blocks).
Violet rollers bear the door weight.
Yellow rollers are for guiding the door.
The 45 deg. corners at the rail ends make the door flush with the wall.
The rack is connected to the door and the blue plate via sliding joints (two pink rods).

STEP files of this video:
http://www.mediafire.com/file/4uhnmb3...
Inventor files of this video:
http://www.mediafire.com/file/on11ssf...