Sarrus linkage

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Animation of the Sarrus Linkage.
  Plates (can be any shape)
  Bars (can be at any angle with each other except a multiple of 180°)
A demonstration using planar links instead of bar links.

The Sarrus linkage, invented in 1853 by

linear motion or vice versa[2] without reference guideways. It is a spatial six-bar linkage (6R) with two groups of three parallel adjacent joint-axes.[3]

Although

straight-line mechanism, the Sarrus linkage had been invented earlier; however, it was largely unnoticed for a time.[4]

Description

The Sarrus linkage consists of four links in two identical groups that are perpendicular to each other, with all links having equal lengths.[5] In the examples shown, the linkage uses two horizontal plates (cyan) positioned parallel to each other, one above the other. Pairs of bars or plates (yellow) with hinges at the middle connect the horizontal plates. The upper plate moves vertically up and down, towards and away from the lower plate. Each hinge constrains the attached bars or plates to remain in the same plane as the hinge, and also to remain in the same axial translation.

The Sarrus linkage is of a three-dimensional class sometimes known as a

Degree of Freedom
2-sided Sarrus linkage is 0. However, due to overconstrain, the upper platform can move up and down.

Gallery

  • Alternative Sarrus linkage
    Alternative Sarrus linkage
  • 3-sided linkage
    3-sided linkage
  • 4-sided linkage
    4-sided linkage
  • 6-sided linkage
    6-sided linkage

See also

References

  1. ISBN 9781118933282
    .
  2. ISBN 9789400741317
    .
  3. ISBN 9783319233260
    .
  4. ^ pergatory.mit.edu Archived 2007-02-10 at the Wayback Machine – Sarrus' mechanism
  5. ^
    ISBN 9781593274344
    .

External links

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