In a four bar mechanism, l, is a fixed link; l2 is driver crank; l3 is coupler and l4 is follower crank. l=27 cm, l3 =5 cm and l4=10 mm. find the length of the link l1 if the linkage can be classified as a double rocker mechanism:

Explanation:

Given that

Here shortest link is link3

To make the linkage as a double rocker mechanism we have to fix longest link that link is link1

So for double rocker mechanism

Now put the values

It means that length of link1 should be greater than 32 cm.

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explanation:

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