A hinge structure for mounting a swingable member which is swingable relative to a body member, includes a first knuckle formed on the swingable member, a second knuckle formed on the body member coaxial with the first knuckle, and a pivot pin extending through the first and second knuckles to join the...http://www.google.es/patents/US7178200?utm_source=gb-gplus-sharePatente US7178200 - Hinge structure
