Hart's inversor

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Hart's 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).
Hart's A-frame. 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 a mechanism that provides a perfect straight line motion without sliding guides.[1]

It was invented and published by Harry Hart in 1874–5.[1][2]

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] (The fixed points and driving arm make it a 6-bar linkage.)

Hart's Inversor is based on an Antiparallelogram.

See also[edit]


External links[edit]

  • bham.ac.uk – Hart's A-frame (draggable animation) 6-bar linkage