2D hinge joint with sprite

Ok, I must be missing something in understanding how this works. **All I want to do** is have the character swing back and forth with limited angle on the chain. That is it. [Character][1] I guess I don't understand exactly how the 2D hinge joint works and googling has failed me. How do I set the anchor at the top of the chain and cause it to swing slowly back and forth? Thank in advance! [1]: http://i.imgur.com/E2OevmF.png