The basic principle of pliers
Pliers are usually forged from alloy and non alloy structural steels. For general pliers, it is made of high quality carbon structural steel with 0.45% carbon content. High quality and heavy duty tongs are made from high carbon content and / or alloy elements such as chromium or vanadium.The origin of pliers in Europe can be traced back to one thousand BC, people began to cast iron. In the casting process, can be used for clamping pliers hot iron. In the past, the shape of forged pliers remained almost unchanged. The types of pincers expand with the development of handicraft, commerce and industrialization. 100 types of universal pliers have been developed. Special applications of pliers are also increasing. Of course, these special pliers are not always available in the general scope. In Germany alone, the monthly production capacity of more than 1 million pliers, about 50% of export. Most of them are universal pliers, such as cutting pliers, wire cutters and water pump clamps.
As a basic principle, the difference is as follows:The cutting pliers are used for cutting or trimming (side cutting pliers, front cutting pliers, cutting pliers, etc.)Clamp (flat nose pliers, long mouth pliers, water pump pliers)Wire cutters can be used for cutting and clamping (wire cutters, tongs, electronic pliers, etc.)The difference between the articulated structures is as follows:A butt joint, such as a carpenter's pliers. There is no need for milling and riveting at the top of the pliers to be butted with each other.Single cut, such as wire cutters. Butt joint milling, milling half thickness, so that the two pieces of pliers inserted into each other.The sleeve is connected with one handle and is provided with a groove so that the other handle passes through the groove and is twisted at the joint part. Sleeve type pliers - in addition to water pump pliers - - because the use of hard alloy steel manufacturing is more difficult, so the manufacturing cost is higher. Therefore, compared with the first two methods, it is relatively minor.
This will be smaller (such as external force exerted on the clamp arm on the hand) into greater skill, makes the pliers can effectively hold or cut. When the external force applied to the caliper arm increases with the lever rate, the force acting on the pliers nozzle creates a clamping force to move the outside force. To produce a greater external force, the distance from the center of the riveting position of the pliers to the handle must be as long as possible, and the distance from the clamping port or shear port to the riveted center must be as short as possible. But many will largely increase the pliers hand, because they just make it easier, in places such as: work hard to handle assembly and electronic electronic equipment and precision engineering application etc..
A pair of pliers consists of three parts:A pair of handles used for holding. A gripping handle designed according to ergonomic principles for easier safe and comfortable grip. The connecting shaft, which is the connecting shaft point of the pliers. The connection must be smooth, free of any looseness, easy to open or close with a single hand. The tongs hold the jaws of the pliers or cut the edges of the knife. The cutting edge of the pliers is finely shaped into the proper shape. The two cutting edges (with springs) must be very sharp and close to each other, making it easy to cut wires.
