Short description: Linkage generating approximate straight line motion

Animation of the Roberts Linkage

Dimensions:
Green Triangle = a, a, b (a are the longer sides)
Yellow Links = a
Horizontal Distance between Ground Joints = 2b

A Roberts linkage is a four-bar linkage which converts a rotational motion to approximate straight-line motion.[1]

The linkage was developed by Richard Roberts.[1]

The Roberts linkage can be classified as:

* Watt-type linkage[1]
* Grashof rocker-rocker[2]
* Symmetrical four-bar linkage[3]

## References

1. ↑ 1.0 1.1 1.2 Sangwin, C.J.. "How to draw an approximate straight line!". http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/straightline/.
2. ↑ "Roberts Straight Line Linkage". https://www.softintegration.com/chhtml/toolkit/mechanism/fourbar/fourbarRoberts.html.
3. ↑ "Chebyshev's Straight line Mechanism & Robert's Straight Line Mechanism" (in en). 2008-10-26. https://www.brighthubengineering.com/machine-design/12694-kinematics-special-mechanisms-straight-line-mechanisms-two/.

## See also

* Straight line mechanism
* Four-bar linkage

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