Bell Crank - Revision history

DT Online: Added image

2018-02-05T09:04:09Z

Added image

← Older revision		Revision as of 09:04, 5 February 2018
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			[[File:Campagnolo Record brake caliper.jpg\|200px\|right\|Campagnolo Record brake caliper\|link=https://en.wikipedia.org/wiki/Bicycle_brake#Side-pull_caliper_brakes]]
	=====Features and Uses=====		=====Features and Uses=====

	A common device which uses this mechanism ~~is the brake caliper on a bicycle~~. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.		The [https://en.wikipedia.org/wiki/Bicycle_brake#Side-pull_caliper_brakes '''Brake Caliper'''] on a bicycle is a common device which uses the principle of this mechanism. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.

DT Online at 10:50, 19 March 2017

2017-03-19T10:50:41Z

← Older revision		Revision as of 10:50, 19 March 2017
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	=====Description=====		=====Description=====

	If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a ~~'''~~[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']~~'''~~ ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.		If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a [https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank'''] ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.

DT Online at 15:58, 3 September 2016

2016-09-03T15:58:44Z

← Older revision		Revision as of 15:58, 3 September 2016
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	\|-		\|-
	\| [https://youtu.be/e51sMAdGS40 '''90° Bell Crank''']		\| [https://youtu.be/e51sMAdGS40 '''90° Bell Crank''']
	\| {{#ev:youtube\|e51sMAdGS40\|~~200x200~~\|right\|\|frame\|loop=1&autoplay=0&playlist=e51sMAdGS40}}		\| {{#ev:youtube\|e51sMAdGS40\|150x150\|right\|\|frame\|loop=1&autoplay=0&playlist=e51sMAdGS40}}
	\|-
	\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.		\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.
	\| {{#ev:youtube\|YGlT0LtRzMw\|~~200x200~~\|right\|\|frame\|loop=1&autoplay=0&playlist=YGlT0LtRzMw}}		\| {{#ev:youtube\|YGlT0LtRzMw\|150x150\|right\|\|frame\|loop=1&autoplay=0&playlist=YGlT0LtRzMw}}
	\| [https://youtu.be/lrL2_5tj1IE '''Toggle Clamp'''] - the adjustable clamp head is held on a Bell Crank which, together with green con-rod and violet lever, form a four bar linkage coming into toggle as the green handle of the con-rod is pushed down.		\| [https://youtu.be/lrL2_5tj1IE '''Toggle Clamp'''] - the adjustable clamp head is held on a Bell Crank which, together with green con-rod and violet lever, form a four bar linkage coming into toggle as the green handle of the con-rod is pushed down.
	\| {{#ev:youtube\|lrL2_5tj1IE\|~~200x200~~\|right\|\|frame\|loop=1&autoplay=0&playlist=lrL2_5tj1IE}}		\| {{#ev:youtube\|lrL2_5tj1IE\|150x150\|right\|\|frame\|loop=1&autoplay=0&playlist=lrL2_5tj1IE}}
	\|}		\|}

DT Online at 13:54, 28 August 2016

2016-08-28T13:54:48Z

← Older revision		Revision as of 13:54, 28 August 2016
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	\|-		\|-
	\| [https://youtu.be/e51sMAdGS40 '''90° Bell Crank''']		\| [https://youtu.be/e51sMAdGS40 '''90° Bell Crank''']
	\| {{#ev:youtube\|e51sMAdGS40\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=e51sMAdGS40}}		\| {{#ev:youtube\|e51sMAdGS40\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=e51sMAdGS40}}
	\|-		\|-
	\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.		\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.
	\| {{#ev:youtube\|YGlT0LtRzMw\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=YGlT0LtRzMw}}		\| {{#ev:youtube\|YGlT0LtRzMw\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=YGlT0LtRzMw}}
	\| [https://youtu.be/lrL2_5tj1IE '''Toggle Clamp'''] - the adjustable clamp head is held on a Bell Crank which, together with green con-rod and violet lever, form a four bar linkage coming into toggle as the green handle of the con-rod is pushed down.		\| [https://youtu.be/lrL2_5tj1IE '''Toggle Clamp'''] - the adjustable clamp head is held on a Bell Crank which, together with green con-rod and violet lever, form a four bar linkage coming into toggle as the green handle of the con-rod is pushed down.
	\| {{#ev:youtube\|lrL2_5tj1IE\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=lrL2_5tj1IE}}		\| {{#ev:youtube\|lrL2_5tj1IE\|200x200\|right\|\|frame\|loop=1&autoplay=0&playlist=lrL2_5tj1IE}}
	\|}		\|}

DT Online at 07:09, 28 August 2016

2016-08-28T07:09:25Z

← Older revision		Revision as of 07:09, 28 August 2016
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	A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.		A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.


	If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.		If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.
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	{\|		{\|
	\|-		\|-
	\| [https://youtu.be/e51sMAdGS40 '''Bell Crank''']		\| [https://youtu.be/e51sMAdGS40 '''90° Bell Crank''']
	\| {{#ev:youtube\|e51sMAdGS40\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=e51sMAdGS40}}		\| {{#ev:youtube\|e51sMAdGS40\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=e51sMAdGS40}}
	\|-		\|-

DT Online: Added animation

2016-08-27T18:58:54Z

Added animation

← Older revision		Revision as of 18:58, 27 August 2016
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	{\|		{\|
			\|-
			\| [https://youtu.be/e51sMAdGS40 '''Bell Crank''']
			\| {{#ev:youtube\|e51sMAdGS40\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=e51sMAdGS40}}
	\|-		\|-
	\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.		\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.

DT Online: Added animations

2016-08-27T16:43:36Z

Added animations

← Older revision		Revision as of 16:43, 27 August 2016
Line 4:		Line 4:

	=====Description=====		=====Description=====

	If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a '''[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']''' ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.		If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a '''[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']''' ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.


	=====Features and Uses=====		=====Features and Uses=====

	A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.		A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.

	If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.		If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.


			=====Animations=====

			* Examples from '''[[2100 Animated Mechanical Mechanisms\|Nguyen Duc Thang's]]''' YouTube Channel '''[[2100 Animated Mechanical Mechanisms]]'''

			{\|
			\|-
			\| [https://youtu.be/YGlT0LtRzMw '''Robot Gripper'''] - a hydraulic or pneumatic cylinder opens and closes the jaws, permitting it to grasp and release objects. The blue jaw is a Bell Crank which, together with the green con-rod and pink slider, creates a slider crank mechanism.
			\| {{#ev:youtube\|YGlT0LtRzMw\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=YGlT0LtRzMw}}
			\| [https://youtu.be/lrL2_5tj1IE '''Toggle Clamp'''] - the adjustable clamp head is held on a Bell Crank which, together with green con-rod and violet lever, form a four bar linkage coming into toggle as the green handle of the con-rod is pushed down.
			\| {{#ev:youtube\|lrL2_5tj1IE\|200x200\|right\|\|frame\|loop=1&autoplay=1&playlist=lrL2_5tj1IE}}
			\|}

	{{Construction Kits Buyers Guide}}		{{Construction Kits Buyers Guide}}

DT Online: Added Template

2016-06-01T08:41:34Z

Added Template

← Older revision		Revision as of 08:41, 1 June 2016
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	[[File:MechanismsBellCrank.jpg\|~~250px~~\|right]]		[[File:MechanismsBellCrank.jpg\|300px\|right]]
			__TOC__


			=====Description=====
	If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a '''[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']''' ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.		If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a '''[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']''' ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.


			=====Features and Uses=====
	A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.		A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.

	If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.		If the fulcrum or pivot is at an equal distance from the input and output then the movement of the output will be equal to the movement of the input. Otherwise the movement will be different and the system will have some degree of '''[[Mechanical Advantage]]'''.


			{{Construction Kits Buyers Guide}}

DT Online: Changed link

2015-02-21T18:03:58Z

Changed link

← Older revision		Revision as of 18:03, 21 February 2015
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	[[File:MechanismsBellCrank.jpg\|250px\|right]]		[[File:MechanismsBellCrank.jpg\|250px\|right]]

	If an ‘L’-shaped [[Class of Lever\|lever]] is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This [[linkage]] is known as a [https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank'''] ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.		If an ‘L’-shaped '''[[Class of Lever\|lever]]''' is pivoted at its centre, the direction of the input movement or force would be turned through 90° at the output. This '''[[:Category:Linkages\|linkage]]''' is known as a '''[https://en.wikipedia.org/wiki/Bellcrank '''Bell Crank''']''' ''(so called because it was used in Victorian times in linkages used to operate doorbells and servants' bells)''. They can be used to change the angle of motion through any angle but 90° is common.

	A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.		A common device which uses this mechanism is the brake caliper on a bicycle. Here the force from the handlebar lever is turned through 90° to squeeze the brake block against the wheel rim.

DT Online at 18:35, 15 February 2015

2015-02-15T18:35:48Z

← Older revision		Revision as of 18:35, 15 February 2015
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	[[Category:Primary]]		[[Category:Primary]]
	[[Category:Secondary]]		[[Category:Secondary]]
	~~[[Category:Mechanisms]]~~
	[[Category:Linkages]]		[[Category:Linkages]]