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.

Plier Series

Common types and uses of pliers
Pliers have many functions and are used in many industries. The pliers used in different industries are also different. Generally, the more commonly used pliers are:
1. Wire stripper
Wire strippers are commonly used tools for internal electricians, motor repairs, and instrumentation electricians. They are composed of knife edges, crimping ports and clamp handles. They are mainly used for stripping plastic and rubber insulated wires and cable core wires.
2. Wire cutters
Also called a vise, it is a kind of clamp and cutting tool. It is composed of jaws, tooth edges, knife edges, guillotines and pliers handles. It is mostly used to pick up nails or break nails and iron wires.
3. Nozzle pliers
It can be divided into electrical and electronic categories. It is mainly used for cutting injection molding machine products, plastic products, and injection nozzles. It is also suitable for cutting metal products and electronic component pins.
4. Needle-nose pliers
Also known as trimmers, pointed pliers, and pointed pliers. They are composed of pointed tips, knife edges and pliers handles. They are generally made of 45# steel. They are used to cut single and multi-strand wires with thinner diameters and to give orders. Stranded wire joint bending, stripping of plastic insulation layer, etc., can be operated in a relatively small working space.
5. Curved nose pliers
Also called elbow pliers, its function is similar to that of needle-nose pliers without cutting edge, and it is suitable for use in narrow or recessed working spaces.
6. Flat nose pliers
It is a commonly used tool for assembly of metal parts and telecommunications engineering. It is generally used to bend metal sheets and metal filaments to make them into the required shape. In repair work, they are used to install and pull out pins, springs, etc.
7. Diagonal pliers
Mainly used to cut metal wires, flat-nose diagonal pliers are suitable for use in recessed working spaces.
8. Top cutting pliers
End-cutting pliers are similar to diagonal pliers. They are mainly used for cutting steel wires with the cutting edge at the top.
9. Water Pump pliers
The function is similar to a pipe wrench, but it is lighter, smaller and easier to use than a pipe wrench. However, the clamping force is not as good as a pipe wrench. Generally, it is only suitable for household non-professional emergency or simple installation of water pipes.
10. Slip joint pliers
The shape resembles a carp. The opening width of the jaws has two adjustment positions, which can be enlarged or reduced. It is mainly used to clamp round parts. It can also replace small nuts and small bolts with a wrench. It is often used in the auto repair industry.
11. Circlip pliers
Commonly known as circlip pliers, it is a special tool used to install inner and outer circlips, and can also be used to remove circlips. .
12. Vigorous pliers
It is mainly used for clamping parts for riveting, welding, grinding, etc. It can also be used as a wrench. Its characteristic is that the jaws can be locked and generate a large clamping force to prevent the clamped parts from loosening.

Wire Stripper,Needle-Nose Pliers,Wire Cutters,Curved Nose Pliers

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