How to create a rig for microphone pantograph?

I have to rig microphone pantograph, but I don’t know exactly how to implement it.
My ready model with not working rig how it need to be.
GIF
I prepared another scene with similar blank model and added some bones for easy start. What kind of constraints and where need to be placed bones to make rig behave like it need to be to make pantograph bend and unbend like in real world?
blank model img
Blender file with blank model
pantograph to rig.blend (1.7 MB)

I finally made it working!
:partying_face:

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