[dlam]

I like to watch the Tom Tomesello video. He's got an excellent example of the three types of hinges in action. Sometimes it's easier to grasp the concept be watching the player do it than by reading it.
The hinge action refers to how the clubface meets the ball rather than a specific joint say the wrist hinge. The arms shoulders and wrist and torso work together to create a "hinge" action to impart the various hinging action.
These motions have their own distinct timing and direction.

Try short chip like shots with wedge using all three hinge actions. Once you "get" it you will notice there will be a feeling of roll, no roll or reverse roll of the clubface as it meets the ball. These are the layback and closing feelings of the clubface that was describe in earlier posts.