There just are not invented contraptions to the front door had closed by itself. This special spring hinges, and cargo the device with counterweights and a pulley system, and various spring or rubber band. There are commercially available, but, unfortunately, they are not without drawbacks: some are too complicated and quite expensive, others are inconvenient to use or unreliable, easily damaged. Therefore, home designers continue on their own to solve these problems, as evidenced by the proposed content selection submitted by readers. In the winter the doors of the entrances of our homes are often left open. This leads to overconsumption of energy required for heating staircases. To save precious heat needed simple automation.
However, you can do without mechanical devices, providing a small tilt of the entire door frame. The main drawback — the impact of the door on the box — easy to remove, making the strips thick rubber on the vertical part of the door frame.
Fig. 1. The spring mechanism the door is closing:
1 — rubber isolator, 2 — door, 3 — spring.
To ensure a tight seal using the device with a load connected to Derio with the help of a rope passing through the block. Depending on the installation location of the last return time will either increase or decrease. To limit the angular velocity of the door when closing the cargo is placed in a vertical cylinder filled by a liquid, preferably mineral oil. Under the weight of the load will fall in a viscous medium, which will limit its speed and, accordingly, the angular velocity of the door movement. The gap between the tube wall and the cylindrical surface of the load should be no more than 1 mm.