Question

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:

Answer 1

Answer:

$L_1>32 cm$

Explanation:

Given that

$L_2=27 cm$

$L_3=5 cm$

$L_4=10 cm$

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

$L_3+L_1>L_2+L_4$

Now put the values

$5+L_1>27+10$

$L_1>32 cm$

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