Guys, thank you so much for your help!
In case of that model that I’ve posted above, this model is made up of some primitives, I combine these primitives in the end to one model.
If I don’t do that, UE4 will import each part of the model as one mesh…and I had to build up the complete model in UE4 again.
Sure. Thank you for your closer look at this.
>>FBX File](http://www.snowfall-games.com/dl/Door_Test_8.fbx)
Thank you for this, but in my specific case is the model an old elevator door, in this case I have no idea how I should rig that correctly.
Definitely, it could be. 
Thank you for your time.
Kind regards
CallHimX