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The Klann linkage is a planar mechanism designed to simulate the gait of legged animal and function as a wheel replacement, a leg mechanism. The linkage consists of the frame, a crank, two grounded rockers, and two couplers all connected by pivot joints. It was developed by Joe Klann in 1994 as an expansion of Burmester curves which are used to develop four-bar double-rocker linkages such as harbor crane booms. It is categorized as a modified Stephenson type III kinematic chain.
The proportions of each of the links in the mechanism are defined to optimize the linearity of the foot for one-half of the rotation of the crank. The remaining rotation of the crank allows the foot to be raised to a predetermined height before returning to the starting position and repeating the cycle. Two of these linkages coupled together at the crank and one-half cycle out of phase with each other will allow the frame of a vehicle to travel parallel to the ground.
The Klann linkage provides many of the benefits of more advanced walking vehicles without some of their limitations. It can step over curbs, climb stairs, or travel into areas that are currently not accessible with wheels but does not require microprocessor control or multitudes of actuator mechanisms. It fits into the technological space between these walking devices and axle-driven wheels.
This animation show the working of klann mechanism.
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In US Patent 6,260,862 there is a set of coordinates for an example leg:
|9||1.366||1.366||first rocker arm axle|
|11||1.009||0.574||second rocker arm axle|
|fully extended ground stride position|
|grounded gait position|
- Linkage (mechanical)
- Leg mechanism
- Mondo Spider
- Jansen's linkage
- Chebyshev linkage and Chebyshev's Lambda Mechanism
- Leg mechanism
- Rooney, T., Pearson, M., Welsby, J., Horsfield, I., Sewell, R. and Dogramadzi, S. (6–8 September 2011), Artificial active whiskers for guiding underwater autonomous walking robots (PDF), CLAWAR 2011, Paris, FranceCS1 maint: uses authors parameter (link)
- "Mechanical Spider". Klann Research And Development, LLC. Archived from the original on 14 April 2004. Retrieved 22 November 2016.
- U.S. Provisional Application Ser. No. 60/074,425, was filed on Feb. 11, 1998
- U.S. Patent 6,260,862
- U.S. Patent 6,364,040
- U.S. Patent 6,478,314
- Ganapati, Priya. "Robotic Spider Melds Legos and 3-D Printing". Wired. Retrieved 22 November 2016.
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