The sink hinge is broken.
A home owner from ILLINOISE says:
June 8, 2016
Name : there is no name it says made in W.Germeny and some numbers I don't know if you can see them into picture. this one from kitchen sink (upper side) please let me know it if you have similar one i can take to change. thank you
Tom from SWISCO responded:
June 9, 2016
We don't carry this exact hinge, but we do carry a few that may possibly replace it. I recommend looking through this page and seeing if anything we carry here can work.