A chain-link fence (also referred to as wire netting, wire-mesh fence, chain-wire fence, cyclone fence, hurricane fence, or diamond-mesh fence) is a type of woven fence usually made from galvanized or LLDPE-coated steel wire. The wires run vertically and are bent into a zig-zag pattern so that each "zig" hooks with the wire immediately on one side and each "zag" with the wire immediately on the other. This forms the characteristic diamond pattern seen in this type of fence.
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Development of chain-link fencing
In the United Kingdom, the firm of Barnard, Bishop & Barnard was established in Norwich to produce chain-link fencing by machine. The process was developed by Charles Barnard in 1844 based on cloth weaving machines (up until that time Norwich had a long history of cloth manufacture).
The Anchor Post Fence Co., established in 1891, bought the rights to the wire-weaving machine and was the first company to manufacture chain-link fencing in the United States. Anchor Fence also holds the first United States patent for chain-link. The machine was purchased from a man in 1845 from Belgium who originally invented the wire bending machine.
Sizes and uses
In the United States, fencing usually comes in 20 ft and 50 ft rolls, which can be joined by "unscrewing" one of the end wires and then "screwing" it back in so that it hooks both pieces. Common heights include 3 ft, 3 ft 6 in, 4 ft, 5 ft, 6 ft, 7 ft, 8 ft, 10 ft, and 12 ft, though almost any height is possible. Common mesh gauges are 9, 11, and 11.5. Mesh length can also vary based on need, with the standard mesh length being 2". For tennis courts and ball parks, the most popular height is 10 ft, and tennis courts use a mesh length of 1.75".
The popularity of chain-link fence is from its relatively low cost and that the open weave does not obscure sunlight from either side of the fence. One can make a chain-link fence semi-opaque by inserting slats into the mesh.
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Installation
The installation of chain-link fence involves setting posts into the ground and attaching the fence to them. The posts may be steel tubing, timber or concrete and may be driven into the ground or set in concrete. End, corner or gate posts, commonly referred to as "terminal posts", must be set in concrete footing or otherwise anchored to prevent leaning under the tension of a stretched fence. Posts set between the terminal posts are called "line posts" and are set at intervals not to exceed 10 feet. The installer attaches the fence at one end, stretches it, and attaches at the other, easily removing the excess by "unscrewing" a wire. Finally, the installer ties the fence to the line posts with aluminum wire. In many cases, the installer stretches a bottom tension wire, sometimes referred to as "coil wire", between terminal posts to help minimize the in and out movement that occurs at the bottom of the chain-link mesh between posts. Top horizontal rails are used on most chain-link fences, although not necessary. Bottom rails may be added in lieu of bottom tension wires, and for taller fences, 10 feet or more, intermediate horizontal rails are often added.
Once stretched, a bottom wire should be secured to the line posts and the chain-link mesh "hog ringed" to the tension wire 2' on center. One generally installs this wire before installing the chain-link mesh.
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Manufacturing
The manufacturing of chain-link fencing is called weaving. A metal wire, often galvanized to reduce corrosion, is pulled along a rotating long and flat blade, thus creating a somewhat flattened spiral. The spiral continues to rotate past the blade and winds its way through the previous spiral that is already part of the fence. When the spiral reaches the far end of the fence, the spiral is cut near the blade. Next, the spiral is pressed flat and the entire fence is moved up, ready for the next cycle. The end of every second spiral overlaps the end of every first spiral. The machine clamps both ends and gives them a few twists. This makes the links permanent.
An improved version of the weaving machine winds two wires around the blade at once, thus creating a double helix. One of the spirals is woven through the last spiral that is already part of the fence. This improvement allows the process to advance twice as fast.
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Notable uses
- Used to notable effect in the Gehry Residence by Frank Gehry
- Wrestling steel cage matches
- Backstops used in baseball and softball fields
- Before the advent of gravel trap in the later half of the 1980s, chain-link fencing was used as catch fences in racetracks to slow out-of-control cars down before they impact barriers. In the 2000s they continued to be used at American dirt tracks.
- Many parks in London were fitted with chain-link fencing during the Second World War when the original iron and steel railings were removed for the war effort (though many are now being replaced).
Source of the article : Wikipedia
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