Annimation Rigging: 3-bone constrain? Or how to construct one.

Hello all,

Currently I am trying the Annimation Rigging package on a mechanical walker with 3 boned legs.
However I can not seem to figure out how to correctly handle 3 bones.

The image attached shows me the setup of a leg.
The green one is the sholder so to say, while can rotate freely, the purple is the end point.
Then the red ones are used to fold and extend the leg, and this is the part I am unable to figure out. The red ones can only rotate on 1 axis.

If I use a chain IK constraint all the joints don't have constraints I want. And the 2 bone IK doesn't have bones.

Any ideas how I can properly set this up? Or how I can use a combination of constraints to achieve the wanted result?

 

Thanks for your awnser.

I have looked at some kind of rotation limit but I dont see how to make it work with for example the chain IK. Or how else to make it work.

Would this solution end up in full IK for the entire arm? It sounds like this will mainly get you IK for the first 2 parts of the arm and then the final part not being full IK. But I can understand it the wrong way.

The result I want is similar to what is show in this video:

Will something like that ever be available by default? Or will an example be available?

 

Any ideas on how to implement this 3-bone IK?

UPD
I was trying to recreate insect leg movement. And I kinda did it
I set up Two Bone IK Constraint one bone earlier Tip transform.
Then placed target transform as a child of the hint transform.
Hint must be placed at the end of the leg (like tip)
Target's position and rotation must align with the last leg's bone.

Result is not perfect, but for now, it's enough for me.
Hope this helps someone else

 

May we have some images or a video of this arrangement?

 

If there are no three bone constraints how do people normally doing finger animation?