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{{More footnotes|date=February 2011}}
[[Image:Pintle and gudgeon rudder system scheme.svg|thumb|200px|Pintle and gudgeon rudder system. Part 2 is the pintle, and part 3 is the gudgeon.]]
[[File:L-Kloben.png|thumb|160px|Several examples of pintles as part of door hinges]]
A '''pintle''' is a pin or bolt, usually inserted into a '''[[gudgeon]]''', which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle pins securing casters in furniture.
==Use==
Pintle/gudgeon sets have many applications, for example: in [[sailing]] to hold the [[rudder]] onto the [[boat]]; in transportation a pincer-type device clamps through a [[lunette ring]] on the tongue of a trailer; in controllable solid rocket motors a plug moves into and out of the motor throat to control thrust.
In electrical cubicle manufacture, a pintle hinge is a hinge with fixed and moving parts. The hinge has a pin "pintle" and can be both external and internal. The most common type consists of three parts. One part on the body of the cubicle, one part on the door and the third part is the pintle.
In [[Road transport|transportation]], a ''pintle hitch'' is a type of [[tow hitch]] that uses a tow ring configuration to secure to a hook or a ball combination for the purpose of towing an [[Trailer (vehicle)|unpowered vehicle]].<ref>[http://www.tjtrailers.com/store/pintle-hooks-combination-hitches-gooseneck-hitch-plates.html "Pintle Hooks and Combination Hitches"], accessed 2011-02-04.</ref><ref>[http://www.hitchanything.com/Pintle-Hitch/ "Pintle Hitch, Hooks, Mounts"] {{webarchive|url=https://web.archive.org/web/20130119110441/http://www.hitchanything.com/Pintle-Hitch/ |date=2013-01-19 }}, accessed 2013-01-22</ref>
As a [[weapon mount]], a pintle mount is used with [[machine gun]]s as the mounting hardware that mates the machine gun to a vehicle or tripod. Essentially, the pintle is a bracket with a cylindrical bottom and a cradle for the gun on top; the cylindrical bottom fits into a hole in the tripod while the cradle holds the gun.
In [[furniture]], a pintle is usually fitted to a [[caster]]; the pintle is then inserted into a base, fixing the [[caster]] to that base.
In [[rocket|rocketry]], a [[pintle injector]] uses a single-feed fuel injector rather than the hundreds of smaller holes used in a typical rocket engine.<ref>[http://nssphoenix.wordpress.com/2010/06/08/pintle-injector-rocket-engines/ "Pintle Injector Rocket Engines"], accessed 2011-02-04.</ref> This simplifies the engine, reducing cost and improving reliability, while surrendering some performance. [[Grumman]] used the pintle-based [[Pratt & Whitney Rocketdyne|Rocketdyne]] [[RS-18]] for the [[Apollo Lunar Module#Ascent stage|Ascent stage]] of the [[Apollo Lunar Module]]. [[TRW Inc.|TRW]] used this same injector for the [[Descent Propulsion System]] on Apollo's Lunar Module. Notable modern uses are in the [[Merlin (rocket engine family)|Merlin engines]] developed by [[SpaceX]].
[[File:Republic P-47D-30-RE side view 061020-F-1234P-021.jpg|thumb|left|The forward-raked main gear struts on the Republic P-47 partly used "pintle angling" to allow them to clear the forward wingspar during retraction.]]
Pintle is also a common term used in the design of aircraft landing gears. It describes the attachment point between the landing gear structure and the aircraft structure. The pintle is the bolt around which the landing gear rotates when it is extended/retracted into/out of the aircraft. The pintle is a highly stressed component during landing manoeuvres and is often made from exotic metal alloys.<ref>{{cite book |title=Aircraft Landing Gear Design: Principles and Practices|author=Norman S. Currey|year=1988|ISBN=978-1-60086-018-8}} </ref> For World War II aircraft with [[Landing gear#Rearwards and sideways retraction|sideways-retracting main gear]] units, carefully set-up "pintle angles" for such axes of rotation during retraction and extension allowed the maingear struts to be raked forward while fully extended for touchdown and better ground handling, while permitting retraction into rearwards-angled landing gear wells in their wings to usually clear the forward [[wing spar]] for stowing while in flight.<ref>Snyder, Chuck (August 2012). [http://modelaviation.com/howtolandinggear "How to Install Retractable Landing Gear"]. ''[[Model Aviation]]'', p. 37.</ref>
== Gallery ==
<gallery>
File:Pintle and gudgeon.png|Image depiciting a gudgeon with a pintle
File:Pintle Hinge 2.jpg|Pintle hinge parts
File:Pintle Hinge 1.jpg|Pintle Hinge installed on a switchboard
File:Swivel caster.jpg|[[Caster#Swivel_caster|Swivel caster]] with pintle
File:NATO hitch.JPG|Pintle hook
File:NATO tow bar rotated 180 degrees.jpg|[[Lunette ring]], used with a pintle in heavy towing applications
</gallery>
{{Sister project links|wikt=pintle|b=no|q=no|s=no|n=no|v=no|species=no|d=Q7196531}}
== See also ==
* [[Hinge]]
* [[Pintle and gudgeon]]
* [[Tow hitch#Pintle hook and lunette ring|Pintle hook and lunette ring]]
==References==
{{Reflist}}
[[Category:Bearings (mechanical)]]
[[Category:Fasteners]]
[[Category:Hardware (mechanical)]]
[[Image:Pintle and gudgeon rudder system scheme.svg|thumb|200px|Pintle and gudgeon rudder system. Part 2 is the pintle, and part 3 is the gudgeon.]]
[[File:L-Kloben.png|thumb|160px|Several examples of pintles as part of door hinges]]
A '''pintle''' is a pin or bolt, usually inserted into a '''[[gudgeon]]''', which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle pins securing casters in furniture.
==Use==
Pintle/gudgeon sets have many applications, for example: in [[sailing]] to hold the [[rudder]] onto the [[boat]]; in transportation a pincer-type device clamps through a [[lunette ring]] on the tongue of a trailer; in controllable solid rocket motors a plug moves into and out of the motor throat to control thrust.
In electrical cubicle manufacture, a pintle hinge is a hinge with fixed and moving parts. The hinge has a pin "pintle" and can be both external and internal. The most common type consists of three parts. One part on the body of the cubicle, one part on the door and the third part is the pintle.
In [[Road transport|transportation]], a ''pintle hitch'' is a type of [[tow hitch]] that uses a tow ring configuration to secure to a hook or a ball combination for the purpose of towing an [[Trailer (vehicle)|unpowered vehicle]].<ref>[http://www.tjtrailers.com/store/pintle-hooks-combination-hitches-gooseneck-hitch-plates.html "Pintle Hooks and Combination Hitches"], accessed 2011-02-04.</ref><ref>[http://www.hitchanything.com/Pintle-Hitch/ "Pintle Hitch, Hooks, Mounts"] {{webarchive|url=https://web.archive.org/web/20130119110441/http://www.hitchanything.com/Pintle-Hitch/ |date=2013-01-19 }}, accessed 2013-01-22</ref>
As a [[weapon mount]], a pintle mount is used with [[machine gun]]s as the mounting hardware that mates the machine gun to a vehicle or tripod. Essentially, the pintle is a bracket with a cylindrical bottom and a cradle for the gun on top; the cylindrical bottom fits into a hole in the tripod while the cradle holds the gun.
In [[furniture]], a pintle is usually fitted to a [[caster]]; the pintle is then inserted into a base, fixing the [[caster]] to that base.
In [[rocket|rocketry]], a [[pintle injector]] uses a single-feed fuel injector rather than the hundreds of smaller holes used in a typical rocket engine.<ref>[http://nssphoenix.wordpress.com/2010/06/08/pintle-injector-rocket-engines/ "Pintle Injector Rocket Engines"], accessed 2011-02-04.</ref> This simplifies the engine, reducing cost and improving reliability, while surrendering some performance. [[Grumman]] used the pintle-based [[Pratt & Whitney Rocketdyne|Rocketdyne]] [[RS-18]] for the [[Apollo Lunar Module#Ascent stage|Ascent stage]] of the [[Apollo Lunar Module]]. [[TRW Inc.|TRW]] used this same injector for the [[Descent Propulsion System]] on Apollo's Lunar Module. Notable modern uses are in the [[Merlin (rocket engine family)|Merlin engines]] developed by [[SpaceX]].
[[File:Republic P-47D-30-RE side view 061020-F-1234P-021.jpg|thumb|left|The forward-raked main gear struts on the Republic P-47 partly used "pintle angling" to allow them to clear the forward wingspar during retraction.]]
Pintle is also a common term used in the design of aircraft landing gears. It describes the attachment point between the landing gear structure and the aircraft structure. The pintle is the bolt around which the landing gear rotates when it is extended/retracted into/out of the aircraft. The pintle is a highly stressed component during landing manoeuvres and is often made from exotic metal alloys.<ref>{{cite book |title=Aircraft Landing Gear Design: Principles and Practices|author=Norman S. Currey|year=1988|ISBN=978-1-60086-018-8}} </ref> For World War II aircraft with [[Landing gear#Rearwards and sideways retraction|sideways-retracting main gear]] units, carefully set-up "pintle angles" for such axes of rotation during retraction and extension allowed the maingear struts to be raked forward while fully extended for touchdown and better ground handling, while permitting retraction into rearwards-angled landing gear wells in their wings to usually clear the forward [[wing spar]] for stowing while in flight.<ref>Snyder, Chuck (August 2012). [http://modelaviation.com/howtolandinggear "How to Install Retractable Landing Gear"]. ''[[Model Aviation]]'', p. 37.</ref>
== Gallery ==
<gallery>
File:Pintle and gudgeon.png|Image depiciting a gudgeon with a pintle
File:Pintle Hinge 2.jpg|Pintle hinge parts
File:Pintle Hinge 1.jpg|Pintle Hinge installed on a switchboard
File:Swivel caster.jpg|[[Caster#Swivel_caster|Swivel caster]] with pintle
File:NATO hitch.JPG|Pintle hook
File:NATO tow bar rotated 180 degrees.jpg|[[Lunette ring]], used with a pintle in heavy towing applications
</gallery>
{{Sister project links|wikt=pintle|b=no|q=no|s=no|n=no|v=no|species=no|d=Q7196531}}
== See also ==
* [[Hinge]]
* [[Pintle and gudgeon]]
* [[Tow hitch#Pintle hook and lunette ring|Pintle hook and lunette ring]]
==References==
{{Reflist}}
[[Category:Bearings (mechanical)]]
[[Category:Fasteners]]
[[Category:Hardware (mechanical)]]