Making model and problem about skeleton

In the process of attaching the skeleton on my model, I had some problem moving the skeleton and object together.

Maybe the position of the skeleton is not applied right, or skin binding was not processed through the object. I'm confused about folding and unfolding movement by using skeleton tool.  

structure moving problem skeleton from Doyeon Kwon on Vimeo.

I recorded Prof.David's process of how to use the skeleton tool, but it was not clear to me because in Maya I couldn't find the rigid bind. I researched around for some tutorials and references, but I couldn't find the exact answer. It was too difficult to understand the difference between IK/FK handle, joint and spline tool.