Scott Russell linkage

Freemantle straight-line linkage from British Patent 2741, November 17, 1803
Animation of a Scott Russell linkage

A Scott Russell linkage (although already patented in 1803 by watchmaker William Freemantle[1][2]) gives a theoretically linear motion by using a linkage form with three portions of the links all equal, and a rolling or sliding connection. Can be used to form a right-angle change of motion, linear-to-linear.

A different form of the linkage has been used in a front wheel drive vehicle with solid rear axle to control lateral movement, and with a flexing elastomeric connection instead of the rolling or sliding connection.[3]

The linkage does not share the disadvantages of the asymmetric Panhard rod and although more compact than Watt's linkage has all the forces in one link.[4]

A Scott Russell linkage on the rear axle of a 2002 Nissan Sentra

References

  1. ↑ British Patent 2741, November 17, 1803
  2. ↑ Project Gutenberg: KINEMATICS OF MECHANISMS FROM THE TIME OF WATT, Eugene S. Ferguson
  3. ↑ US Patent 6179328
  4. ↑ Article about the Scott-Russell linkage used in the Nissan Sentra

External links