An old kitchen table has kind of spanning metal clips connecting parts; some of them are rusty and do not span well anymore.
Note: you might think that because of the rust the clips can't be closed anymore, but in fact they have somehow become weak, i.e. normally you would close and open them with applying slight force, but now the clips can just open up by themselves because of the gravity.
What is the proper name of this metal parts so that I could order and replace them?