Zaoyang's Good Invention Patent Policy

As early as 2200 years ago, our ancestors used sliding doors. There is a window that can be opened and closed freely on both sides of the bronze carriage in the second pit of Terracotta Warriors. The window is shaped like a hollow diamond pattern, similar to a modern screen window. There are grooves on the top and bottom of the window frame, and there is a certain gap between the inner and outer interlayer on the right side of the window frame, so that the window is just embedded in the groove. When the window is opened, the window plate is pushed, and the window plate slides into the interlayer of the window frame along the track in the groove, and is pushed out from the interlayer when the window is closed, which is flexible and convenient to open and close. The structure and shape of this kind of sliding window are almost the same as those of sliding windows and sliding doors in modern buildings. Therefore, sliding windows and sliding doors should be the invention patents of Qin people.