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Tensioner

Device that creates or maintains tension

Chain tensioner on a [[single-speed bicycle

Belt tensioner on a [[belt-drive bicycle

A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring-loaded bicycle chain tensioner, the tension it creates. The force may be generated by a fixed displacement, as in the case of an eccentric bicycle bottom bracket, which must be adjusted as parts wear, or by stretching or compressing a spring, as in the case of a spring-loaded bicycle chain tensioner; by changing the volume of a gas, as in the case of a marine riser tensioner; by hydraulic pressure, as in the case of a hydraulic bolt tensioner; or by gravity acting on a suspended mass, as in the case of a chair lift cable tensioner.

Applications

Bolt tensioners are devices designed to apply a specific tension to a bolt. The device may be either removed once the actual nut is threaded into place or left in place, in the case of a hydraulic nut.{{cite web
The belt or chain tension on a single-speed bicycle can be maintained by either setting the fixed horizontal position of the rear sprocket or the front chainring horizontally, or by a separate tensioner that pushes perpendicular to the chain with either a fixed position or spring tension.{{cite web
The serpentine belt and the timing belt or chain on an automobile engine may be guided by an idler pulley and/or a belt tensioner, which may be spring-loaded, hydraulic, or fixed.{{cite web
The chain tension of a chainsaw may be adjusted with a chain tensioner.{{cite web
A marine riser tensioner is a device used on an offshore drilling vessel that provides a near-constant upward force on the drilling riser independent of the movement of the floating drill vessel.
A guideline tensioner is a hydropneumatic device used on an offshore drilling rig that keeps a positive pulling force on the guidelines from the platform to a template on the seabed.
Overhead electrical wires may be kept in tension by springs or weights.
Conveyor belts
Chair lift and gondola lift cables
Certain wood trusses, such as the beam tensioner truss picture below.{{cite web
Fencing made of wire, such as electric fences, barbed-wire fences, and chainlink fences often include tensioning devices to keep them taut.
Belt sanders have a mechanism, often a spring-loaded idler drum, to apply the proper tension to the sanding belt, which can be released to allow for changing belts.{{cite web | archive-date = 2012-08-21 | archive-url = https://web.archive.org/web/20120821195935/http://www.shopsmith.com/academy/beltsand/041902.pdf | url-status = dead

Gallery

File:Overhead line tensioner 012.JPG|Spring-loaded overhead line tensioner File:Overhead line tensioner 003.JPG|Gravity overhead line tensioner File:Nockenwellenantrieb.jpg|Chain tensioner in an automobile engine Image:Tensioner.jpg|Serpentine belt on belt tensioner in an automobile engine File:Tendeur courroie alternateur automobile.jpg|Adjustable, fixed-position belt tensioner in an automobile engine File:Seamus O Kane Band Tensioner System Bodhran.JPG|Drum tensioner File:Conveyor belt tensioner - geograph.org.uk - 1485359.jpg|Conveyor belt tensioner File:Bullwheel and counterweight in tENSION TERMINAL, LOOKING southeast. - Mad River Glen, Single Chair Ski Lift, 62 Mad River Glen Resort Road, Fayston, Washington County, VT HAER VT-38-42.tif|Chair lift cable tensioner File:Pinion P1.18 mounted.jpg|Chain tensioner for a bicycle with an internal gearbox File:Planet_X_Stealth_Pro_Track_Bike_I.jpg|Chain tensioner for a single-speed bicycle File:Single speed conversion.jpg|Bicycle chain tensioned without a dedicated tensioner mechanism File:OldFramesaw-cut-out.png|Traditional Finnish frame saw with wooden frame, loggers' tool before cross-cut and chain saws till 1960s File:Riser_Tensioner.jpg|Marine riser tensioner File:Beam Tensioner Truss.jpg|Beam tensioner truss File:Cric-tenseur.jpg|Chainlink fence tensioner File:Track Tensioner on a Churchill Tank.jpg|Track tensioner on a Churchill Tank

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

drilling-technology hardware-(mechanical)

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