Four bar linkage 9c

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http://youtube.com/watch?v=4rTbsT7hTcg

A special case of the 4-bar linkage. • Input: pink conrod. • Output: oscillating cranks. • The unusualness: a working cycle of the mechanism corresponds 2 revolutions of the input. Oscillating angle of the yellow crank is larger than 180 deg., a thing that is hard to get by using an ordinary 4-bar linkage. It happens because: • 1. The sum of the lengths of the two opposite links is equal to the sum of the lengths of the other two links. • A + B = C + D • A: length of pink conrod (=10) • B: length of green crank (=35) • C: length of yellow crank (=15) • D: distance between fixed axes of cranks (=40) • 2. There are measures to overcome dead positions (when cranks are in line with pink conrod). For example, inertia of the cranks must be big enough. • Inventor files of this video: • http://www.mediafire.com/file/a6rlcca...

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