A fixing device includes a sleeve portion and an engagement portion which are spaced apart but which are interconnected by two flexible strut members, each of which includes short and long arms. A screw can be inserted through a central bore in the sleeve portion so that its end engages a bore in the...http://www.google.de/patents/US5288189?utm_source=gb-gplus-sharePatent US5288189 - Fixing device for a cavity wall
