Ferrule

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For the plant of similar name, see Ferula.

Look up ferrule in Wiktionary, the miễn phí dictionary.

Non-circular ferrules holding bristles of a brush vĩ đại its handle

A ferrule (a corruption of Latin viriola "small bracelet", under the influence of ferrum "iron") is any of a number of types of objects, generally used for fastening, joining, sealing, or reinforcement. They are often narrow circular rings made from metal, or less commonly, plastic. Ferrules are also often referred vĩ đại as eyelets or grommets within the manufacturing industry.^[1]

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Most ferrules consist of a circular clamp used vĩ đại hold together and attach fibers, wires, or posts, generally by crimping, swaging, or otherwise deforming the ferrule vĩ đại permanently tighten it onto the parts that it holds.

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Examples[edit]

The sleeve, usually plastic or metal, on the kết thúc of a shoelace, preventing it from unraveling (called the aglet)
The metal sleeve which is crimped vĩ đại hold the eraser in place on a pencil
The metal band that binds the bristles or hair of a brush vĩ đại its handle
The metal ring which holds a chisel blade's tang vĩ đại its handle
In fiber optic terminations, glass or plastic fibers are bonded vĩ đại precision ferrule connectors (FCs), also described as fiber channel connectors, and polished for splitting or connecting two fibers together.^[2]
The metal spike at the kết thúc of the shaft of an ice axe
The margin of a cast crown that stabilizes root-canal-treated teeth in restorative dentistry^[3]
A ferrule, in respect vĩ đại dentistry, is a band that encircles the external dimension of residual tooth structure, not unlike the metal bands that exist around a barrel. This is also known as the ferrule effect.
The bottom kết thúc of a flag stick on a golf course, which fits snugly into the hole in a cup
The plastic sleeve that adorns the bottom of a steel or graphite golf club shaft just above the club head hosel. Originally designed vĩ đại protect the shaft from damaging vibrations, it is now used mainly for aesthetic purposes.
The metal band used vĩ đại prevent the kết thúc of a wooden instrument or tool from splitting
The semi-circular metal band that holds in place the fibers on the frog of a bow for an instrument in the violin family
Compression fittings for attaching tubing (piping) commonly have ferrules (sometimes called olives, especially in the UK) in them vĩ đại make a liquid-tight connection
A swaged termination type for wire rope
The cap at the kết thúc of a cane or umbrella as well as the ring, often crimped, sometimes pinned, that prevents an umbrella's canopy from sliding off the kết thúc when open
The portion of a cue in pool, billiards and snooker that tops the shaft and vĩ đại which the tip is bonded; historically made of ivory, now typically made of fiberglass, phenolic resin or brass
A joint between sections of a segmented fishing rod
A metal cap at the kết thúc of a cable housing with a hole on a bicycle or motorcycle control cable
The metal sleeve that connects a hypodermic needle vĩ đại a plastic Luer taper (which then connects vĩ đại a syringe or intravenous therapy tubing)
An electric wire ferrule is a metal tube crimped over stranded wire vĩ đại secure it within a screw terminal, usually with electrical insulation protecting any exposed portion of the wire not completely inside the screw terminal post.
A rubber or plastic cap at the bottom kết thúc of a walking stick.
The metal tip on a staff carrying a flag or guidon that finishes and protects the kết thúc of the wooden shaft.

Reasons for use[edit]

Some of the reasons people use ferrules include:^[4]

To shield parts or cables from electromagnetic pulses, environmental damage, the elements, thermal factors, and more.
To cover parts, adding wear resistance, damage protection, or packaging.
As a connector, vĩ đại connect wires, structural devices, and systems
To bind parts together, including bundles of wires, or cloth threads vĩ đại the kết thúc of the mop, as an example.
To act as conveyance for fluids lượt thích oil and water, or for gasses lượt thích air.