Problem#$2$:

a$.$ Calculate the Grashof condition for each fourbar mechanism defined below:

b$.$ For each mechanism provide the Barker Complete Classification:

i$.$ Type.

II$.$ Class.

iii. Code.

c$.$ Which of the above mechanism$($s$)$ would you pick for Liftgate shown below and why?

Folded position

To operate:

Link $4$

Release toggle

Lift tailgate

Truck tailgate $($Link $2)$

Truck body $($Link $1)$

d$.$ Draw a sketch of the lift gate to define which parts are links and joints. Using Kutzbach's

equation demonstrate that the liftgate is either a Structure or Mechanism. Make clear your

decision.

Kutzbach's modification of Gruebler's equation:

$M=3(L-1)-2J_1-J_2$

where:

$M=$ degree $of$ freedom $or$ mobility

$L=$ number $of$ links

$J_1=$ number $of1$ DOF $($ full $)$ joints

$J_2=$ number $of2$ DOF $($ half $)$ joints