[2D] Prevent joint anchor be pushed away from connected anchor ?

Hello, i cant find any solution to my problem.
I have a 2 rigidbodies 2d, main and child, connected with hinge joint attached to child. Issue is when adding force to parent and child collides with other object, child been pushed away from connected point. I want connect child object permanently to this place, allow only rotate thus physics interation with other object.

I've tried connect they with distance joint and set only max distance property but this doesnt helps.
Is there any posibility to make connection like this with some joint ?

 

Is there any possibility to simulate hard 'joint' which interacts on collisions proper way as its joined to other object ? I think that shold be an easy step but i ran out of idea's instead of writing all new mechanic .

 

This seems like it's behaving as though it's a bug. I've followed this video precisely and my hingejoint2d just falls into oblivion when something hits it, but only while attached to another body: https://unity3d.com/learn/tutorials/topics/2d-game-creation/hinge-joint-2d

Also, no springiness on hingejoint2d?

EDIT: The "Connected Rigidbody" must be set to Kinematic or Static for the child hinge joint 2d to not fall into space. Still though, where's the spring setting?

 

You can image this as a element of existing object , which have some push resistance, for example, hmmm, gun trigger ? When i start apply some velocity with angular velocity to parent (in our example for a gun), an element (gun trirrer) without additional force, shouldn't move or be pushed by any forces, and always rotate around connected point. How can i achive somelike this ?

 

If anchor is pushed away. Then you should try changing collision detection in rigidbody2D from continous to discrete. Do these changes in that gameobject where hinge joint component is added. It works properly.