Which law states that the length of
the shortest and the longest links should not be greater than the sum of the
other two links in the four bar mechanism?
Grashof’s law
Grubler’s law
Whitworth’s law
Oldham’s law
Grashof’s law
●Grashof’s law states that a four-bar mechanism has at least one revolving link if the sum of lengths of the largest and the shortest links is less than the sum of lengths of the other two links. It is called class-I four bar linkage.
●When sum of the lengths of the
largest and the shortest link is more than the sum of lengths of other two
link, it is known as a class-II four bar linkage.
●When equalities exist, it is called
class-III four bar linkages.
Hence, the correct option is (A).
&Key Points:-
●Grubler’s lawis used to calculate
degree of freedom of the system.
●Whitworth’s quick-return mechanismis
an inversion of single-slider crank mechanism.
●Oldham’s couplingis
an inversion of double slider crank chain.
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