The two iron pieces on the old-fashioned door padlock are called Qu Xu (qū xū). The iron traps nailed to lock doors, windows, etc. can be fastened with a "tie" (ruthenium rhodium) and can be re-locked. Today's urban residents rarely see them. Now they are only found in iron shops or rural markets. Can be purchased.
The object "Quxu" has a similar meaning to "Ruthenium". They are both "copper or iron rings with two small feet, nailed to doors, windows or cabinets, used to hang nail hooks or locked objects". For example, Qu Xu's record in ancient novels:
"The old woman saw that Song Jiang was about to leave, so she went out to the door, but there was Qu Xu on the door, so she pulled the door shut and pulled Qu Xu out. "We've got it together." - Chapter 21 of "Water Margin"
"Aunt Zhao was talking to Jia Zheng when she suddenly heard a sound outside. She didn't know what it was and was shocked when she asked. It turned out that the outer window drawer was not fastened and it slipped and fell down. "——"Dream of Red Mansions" Chapter 73
Extended information
The development history of locks
The earliest lock was a simple mechanism set up by the owner to prevent others from opening it. The simplest lock applied to the door is the door latch. In ancient my country, there were stone locks without keys. They were bound by ropes or chains. During the Shang and Zhou dynasties, private ownership of the means of production further developed, the gap between the rich and the poor further intensified, and social conflicts became very prominent. At the same time, smelting technology matured and was immediately applied to the lock-making industry.
As a result, copper locks and iron locks that can only be opened with keys appeared, and different locks were matched with different keys. With the rapid development of science and technology, mechanical locks have also made great progress. Modern mechanical locks have a history of more than a hundred years. Pinballs of different lengths are added to the lock core, and the key must be opened with a corresponding tooth shape.
Later, password locks, magnetic locks, electronic locks, laser locks, voice-activated locks and so on were developed. On the basis of the traditional key, one or more sets of passwords, different sounds, different magnetic fields, different sound waves, different beams of light waves, and different images are added. Such as fingerprint, fundus retina, etc.) to control the opening of the lock.