The past, both the will of the emperor's palace, houses, or the civilian brass ball valve population of the small hospital, the general must have a Yuanmen, the two sides peeked in the front door, one to a high place with a Door handles similar objects, the door can be part of it can also be a diamond-shaped door catch, and the Central Xianzhao doors or hanging door catch, fixed inserts on the door of the deduction in the base known as the first shop, known as shop doors. The first shop, the doors on the door are an integral part of the important components.
According to historical records and archaeological confirmed, and no later than the Han, China has used the first shop, now has more than 2,000 years of history. The first shop a brass ball valve variety of modeling, both very simple shapes, but also very complicated real ferocious beast odd shape of the head. Follow the small diameter of only several centimeters, the tens of centimetres in diameter should be. They can knock on the door as the door handles and objects, play a practical role, but also a decoration, landscaping door to the art of window-dressing effect.
Our common in the residential alley in Beijing on the door, most of the first shop is a large diameter of more than 10 centimetres of copper Cha hexagonal pattern, TKW in the door, a circular central dome, four sides for the 2.60-Cha plane Margin, fixed on the door, the central dome at the top of a small brass ball valve hole through the door of a Kazi, the building of the two-way Fan Qi, Kazi fixed on the door, the outside part of a circle shape Wancheng, the door can be linked to Central, Can carry a diamond-shaped Lingjian, door-shaped leaves fall. When standing in front of visiting guests, hand-Rattling the door or doors falling, Central, Central door or doors falling impact on the first shop in a clear voice, to hear the owner after the guests have come to Bianzhi, go door to door amenities .