Roberts linkage

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

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

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. Sangwin, C.J. "How to draw an approximate straight line!". Archived from the original on 2016-07-01.
2. "Roberts Straight Line Linkage". www.softintegration.com. Retrieved 2021-05-04.
3. "Chebyshev's Straight line Mechanism & Robert's Straight Line Mechanism". www.brighthubengineering.com. 2008-10-26. Retrieved 2021-05-04.

See also

• Straight line mechanism
• Four-bar linkage