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Some Fundamentals of Space Mechanisms
Published online by Cambridge University Press: 03 November 2016
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Since a link in a plane has three degrees of freedom the simplest closed plane mechanism with constrained motion must have four lower pairs, i.e. one more than the number of degrees of freedom. If the lower pairs are turning pairs, the mechanism is the well-known four-bar linkage. One or two turning pairs may be replaced by sliding pairs without affecting constrained motion, but not less than two turning pairs must remain in a closed link group.
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- Copyright © Mathematical Association 1956
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