A retaining structure is used to retain a wooden first part and a wooden second part together and includes a retainer fitted to a recess of the first part, and a fastening member to be engaged to the second part. The fastening member has a plurality of wings formed on two sides of an acting end thereof....http://www.google.es/patents/US8104989?utm_source=gb-gplus-sharePatente US8104989 - Retaining structure
