I've got a technic problem.

Hey, I'm trying to build a little something and have pretty much zero experience with technic, so it takes me a lot of time to figure out. I need something like in the first picture, but the black parts have to be parallel and rotate in opposite directions.. it needs to be controlled from the top. Has anyone got an idea on how to solve this issue? I've had many but each time they're either not parallel or rotate in the same direction. I need it to be 3-5 studs wide, the less the better. ...