Grashoff’s Law: For a planar four bar linkage, the sum of the shortest and longest links cannot be greater than the sum of the remaining links if there is to be continuous relative rotation between two members. A mechanism has been defined above as a kinematic chain in which one of the links is fixed. From the four bar mechanism, different versions of each of them can be obtained by fixing any one of the links p, q l or s. Such different versions, which can be obtained by fixing any of the different links, are called its “Inversions”. Many a time, a particular inversion of a mechanism may give rise to different mechanisms of practical utility, when the proportions of the link lengths are changed. By this principle of inversion of a fourbar chain, several useful mechanisms can be obtained. There are three inversions of four bar mechanisms, which are obtained by fixing different links of the kinematic chain. They are: a) Double Crank Mechanism b) Crank Rocker Mechanism c) Double Rocker Mechanism continued.....
Posted on: Mon, 13 Oct 2014 09:12:45 +0000
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