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Pliers

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Title: Pliers  
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Subject: Wrench, Locking pliers, Xcelite, Klein Tools, Metalworking hand tools
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Pliers

Flat-nose pliers

Pliers are a hand tool used to hold objects firmly, possibly developed from tongs used to handle hot metal in Bronze Age Europe.[1] They are also useful for bending and compressing a wide range of materials. Generally, pliers consist of a pair of metal first-class levers joined at a fulcrum positioned closer to one end of the levers, creating short jaws on one side of the fulcrum, and longer handles on the other side.[1] This arrangement creates a mechanical advantage, allowing the force of the hand's grip to be amplified and focused on an object with precision. The jaws can also be used to manipulate objects too small or unwieldy to be manipulated with the fingers.

Pincers are a similar tool with a different type of head used for cutting and pulling, rather than squeezing. Tools designed for safely handling hot objects are usually called tongs. Special tools for making crimp connections in electrical and electronic applications are often called "crimping pliers"; each type of connection uses its own dedicated tool.

There are many kinds of pliers made for various general and specific purposes.

Contents

  • History 1
  • Design 2
  • Ergonomics 3
  • Gallery 4
  • See also 5
  • References 6
  • External links 7

History

Medieval pincers found in Hamburg-Harburg (15th/16th century)

As pliers in the general sense are an ancient and simple

  • How pliers are made (video)

External links

  1. ^ a b "Hand Tools:Tongs, pincers, and pliers". Encyclopedia Britanica. Retrieved Mar 14, 2013. 
  2. ^ Bellis, Mary. "The History of Hardware Tools". Inventors.About.com. Accessed 16 December 2008.
  3. ^ Warre Cornish, Francis (1898). A Concise Dictionary of Greek and Roman Antiquities. London: Spottiswoode & Co. p. 313. 

References

See also

Gallery

Much research has been undertaken to improve the design of pliers, to make them easier to use in often difficult circumstances (such as restricted spaces). The handles can be bent, for example, so that the load applied by the hand is aligned with the arm, rather than at an angle, so reducing muscle fatigue. It is especially important for factory workers who use pliers continuously, and prevents carpal tunnel syndrome.

Ergonomics

Where it is necessary to avoid scratching or damaging the work piece, as for example in jewellery and musical instrument repair, pliers with a layer of softer material such as aluminium, brass, or plastic over the jaws are used.

A plier-like tool designed for cutting wires is often called diagonal pliers. Some pliers for electrical work are fitted with wire-cutter blades either built into the jaws or on the handles just below the pivot.

The materials used to make pliers consist mainly of steel alloys with additives such as vanadium or chromium, to improve strength and prevent corrosion. The metal handles of pliers are often fitted with grips of other materials to ensure better handling; grips are usually insulated and additionally protect against electric shock. The jaws vary very widely in shape and size, from delicate needle-nose pliers to heavy jaws capable of exerting much pressure. The surfaces are typically textured rather than smooth, to minimize slipping.

The basic design of pliers has changed little since their origins, with the pair of handles, the pivot (often formed by a rivet), and the head section with the gripping jaws or cutting edges forming the three elements.

Design

. electronic components, and electrical, pipes, wire, fasteners, horseshoes The number of different designs of pliers grew with the invention of the different objects which they were used to handle: [3]

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