As we all know, the blank frame is used to fix bolts. In fact, there is a mechanism in this. The blue wooden pole can only slide up and down, and the top can be hung on the latch. When the latch is pushed to the right, the blue stick falls into the groove of the latch due to gravity, and the latch is locked. At this time, the bolt can't be translated left and right. You have to reach into the dark compartment and push the blue stick up to unlock it.

Nowadays, door bolts are used less and less, and they may still be used in rural areas. Although it will eventually be eliminated by the times, it should have a special position in the architectural history of China.

Door bolt culture pays attention to symmetry

China architecture, the most important thing is the establishment of the main center line. No matter the east or the west, no nation loves and abides by the axis symmetry line so much. From the palace, the mansion, the Buddhist temple to the common houses, they are all distributed according to the strict central axis, and from the group combination to the one-room layout, they all show the characteristics of the central axis.

The so-called symmetry means that with a point or a line as the center, the shapes and sizes of both sides are consistent and symmetrical, and the colors, shades and structures of things are unified and harmonious. Symmetrical things can give people a quiet sense of seriousness and contain the beauty of balance and stability.