The door in the form of a trapezoid – not architectural elements and a simple and elegant solution to the problem of automatic closing doors that do not require a single additional detail. Instead of springs, hydraulic, pneumatic and even electronic devices works here… gravity. When opening such a door with a tilted axis (rotation its) center of gravity rises. Is to let go of the flap – the center of gravity will tend to occupy its original position, the door will slam shut.
Recommend to read
AND THAT UNDER THE ROOF?
When early man left the caves and moved into the valleys and forests, the primitive housing steel construction with roof canopy, constructed from branches and animal skins. Centuries...
THE WATERLINE FROM THE FILM STRIP
Novice constructor of ship models at first it is difficult to apply ka ha! ship or vessel clear and beautiful the water line. This task can be greatly simplified by using the method used...
