Hart's inversor
![](../I/m/Hart's_Inversor.gif)
Hart's (first) inversor. Links of the same color are the same length. The relative position of the fixed point, the input, and the output along their links is the same (half, here).
![](../I/m/Hart's_A-frame.gif)
Hart's A-frame, or Hart's second inversor. The short links are half the length of the long ones. The center link is one quarter of the way down the long links. A fixed link along the bottom of the same length as the long links is not shown.
Hart's inversor is one of two mechanisms that provides a perfect straight line motion without sliding guides.[1]
They were invented and published by Harry Hart in 1874–5.[1][2]
Hart's first inversor is based on an antiparallelogram. The addition of fixed points and a driving arm make it a 6-bar linkage.
It can be used to convert rotary motion to a perfect straight line by fixing a point on one short link and driving a point on another link in a circular arc.[1][3]
Hart's second inversor, also known as "Hart's A-frame", is less flexible in its dimensions, but has the useful property that the motion perpendicularly bisects the fixed base points.
Example dimensions
- dimensions:
AB = 4
AC = BD = 4
CE = ED = 2
Af = Bg = 3
fC = gD = 1
fg = 2 - dimensions:
AB = Bg = 2
AC = AE = 3
CD = EF = 12
EC = FD = 6
Cp = pD = 6
Eg = 6
See also
- Straight line mechanism
- Four-bar linkage
- Quadruplane inversor a generalization of Hart's first inversor
References
External links
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Wikimedia Commons has media related to Hart's inversor. |
- bham.ac.uk – Hart's A-frame (draggable animation) 6-bar linkage
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