To help you with your request for information to the coats of arms I can only past trough this web page I made some years ago. Do not trust the tree from the early schenks because this is partly WEB info. all others trees are reliable. There are different noble families of schenk with all there own coats of arms even within a familie. "Schenck" originally meant a kind of "righthand" from the knight or ruler in an area. The second in command or responsable. Those people often were knighted or became there own land with a "house". The Schenk fom Nideggen family is such an example of a Schenck that became a noble family. The shield is a mirror image of the shield from the Duke of Gulik, his lord. i visited the remains of the casstle Nideggen and the have the a sample of the original shield that showes a black lion on a gold background. The shield from the Schenks is a golden lion on a black background.
The dutch / german word Schen(c)k means "pouring" bear or wine. The righthand from noble man used to pour the wine for his master. That's why the name "Schenk from Nideggen".