When the primitive people lived a life of burrowing, in order to be safe, sometimes they would push the boulder to block the hole. It was not a thief but a beast. After the emergence of private ownership, the thief appeared, and the lock was born.
As far back as 3,000 years ago, China had a lock. However, the earliest locks have no organs, but they are made into the shape of a vicious animal such as a tiger. To scare away the thief, it can only be said to be a symbolic lock.
It is said that Luban was the first person to install the lock on the agency. Judging from the situation reflected in the unearthed cultural relics and written records, the ancient locks were operated by the elastic force of two plate springs. Until now, this spring is still in use.
In foreign countries, the ancient Greeks have found an extremely reliable lock, but because of the large key, it is difficult to spread in the general family. The ancient Indians made another bird-shaped "lock", and the keyhole was hidden in the wings that could shake. The rise of modern locks? First, the 18th century British people invented the "welding fishing lock." The ball lock we use so far is invented by American Nileus Yale in 1860.
The invention of the key was later than the lock. The ancient Egyptians were the first to use the keys in the world. Their lock is to insert a wooden door bolt into a slot with a wooden bolt at the top of the slot. When the bolt is inserted into the groove, the wooden bolt is inserted into the hole of the bolt. In this way, the bolt is very strong and must be opened with a key.
Since the Egyptian lock can only be used on the side with the bolt, it is not conducive to flexible opening and closing. Therefore, on the basis of this, the Greeks have developed a lock that can be opened from the other side. The key made by the Greeks was a curved wooden stick that was shaped and sized like a farmer's scythe. But there are also some keys that are up to 3 feet long and must be carried on the shoulders to move, quite heavy.
The Romans can be said to be the most elaborate locksmiths in ancient times. They have studied the standard of making keys and have learned to cut the nails at the end of the key into various shapes.
Drywall screws (sometimes called sheetrock screws) provide a stronger hold, but cost a bit more than nails. These usually feature a Phillips head. Coarse drywall screws feature coarse threads to secure gypsum boards to studs. Fine drywall screws feature smaller heads and are used to secure drywall to metal studs..
Drywall screws have deeper threads than regular screws, which prevents them from dislodging easily from the drywall. They are made of steel and require a power screwdriver to drill them into the drywall. ... W-type screws, on the other hand, are longer and thinner. They are designed for installing drywall onto wood.
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