I think that you’r meaning: SS-Unterkampfgruppe „Rink“
Unfortunately, I didn’t found the composition of this ‘’Unterkampfgruppe’’, neither in my books or on the web.
SS Battalion Rink, part of Kampfgruppe Diefenthal, attempted to join the defenders but was sidetracked by an attack on Wurselen by the 30th Division
On the 15th, SS Battalion Rink finally entered the town
http://warfarehistorynetwork.com/daily/ ... or-aachen/
See also here (at page 54) :
https://books.google.be/books?id=txrKBA ... en&f=false
Maybe it’s Hubert RINK:
https://www.tracesofwar.com/persons/138 ... Hubert.htm
Kindly regards from Belgium and sorry for my poor english but’s not my native language.