Ratchet: Difference between revisions
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A similar idea can be used to create a '''Linear Ratchet''' which allows motion in one direction but not the other. A '''Pawl''' type mechanism allows each squeeze of a trigger to tighten a '''[[Bar Clamp]]''' for example. They are found also as '''Quick Release Mechanisms''' on some '''[[Carpenters Vice|Wood VIces]]''' and are the basis of the humble [https://en.wikipedia.org/wiki/Cable_tie '''Cable Tie'''], | A similar idea can be used to create a '''Linear Ratchet''' which allows motion in one direction but not the other. A '''Pawl''' type mechanism allows each squeeze of a trigger to tighten a '''[[Bar Clamp]]''' for example. They are found also as '''Quick Release Mechanisms''' on some '''[[Carpenters Vice|Wood VIces]]''' and are the basis of the humble [https://en.wikipedia.org/wiki/Cable_tie '''Cable Tie'''], | ||
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| See '''[[2100 Animated Mechanical Mechanisms|Nguyen Duc Thang's]]''' example of a [https://youtu.be/V4yxGR4d7l8 '''Ratchet Mechanism'''] being used to convert the continuous rotary motion of a drive shaft into the intermittent rotary motion of a driven shaft such that by flicking over the blue pawl the motion direction of the driven shaft can be changed without changing the input motion direction | |||
| {{#ev:youtube|V4yxGR4d7l8|240x240|right||frame|loop=1&autoplay=1&playlist=V4yxGR4d7l8}} | |||
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[[Category:Mechanisms]] | [[Category:Mechanisms]] | ||
Revision as of 20:02, 25 August 2016
A Ratchet mechanism allows movement in one direction only.
In the illustration, the Ratchet Wheel lifts the Pawl as it rotates anti-clockwise but clockwise rotation is stopped by it. Such a system is used in Winches to allow loads to be lifted up without slipping down again. The Ratchet Wheel could be fixed to the Winch shaft via a Key as shown. Alternatively, use of a square or hexagonal winch shaft would ensure it rotates with the Ratchet.
A similar idea can be used to create a Linear Ratchet which allows motion in one direction but not the other. A Pawl type mechanism allows each squeeze of a trigger to tighten a Bar Clamp for example. They are found also as Quick Release Mechanisms on some Wood VIces and are the basis of the humble Cable Tie,
| See Nguyen Duc Thang's example of a Ratchet Mechanism being used to convert the continuous rotary motion of a drive shaft into the intermittent rotary motion of a driven shaft such that by flicking over the blue pawl the motion direction of the driven shaft can be changed without changing the input motion direction |