Patent ID: 7862274

Claim:
A fastener to affix a component in a support fitted with an aperture, comprising: an affixation casing of resilient plastic, further comprising a hollow conical shell defining a cylindrical cavity closed at a tip thereof, and a radial flange at a distant end thereof, the radial flange configured to cooperate in sealing manner with a rim of a support surface defining an aperture received by the casing, the casing being fitted peripherally with radial bosses configured to engage from below the aperture rim when the casing is inserted into said aperture, the cylindrical cavity having a annular inwardly point boss; and a plug comprising: a head, on an underside of which is fitted a radial surface; a cylindrical segment extending from a lower surface of the radial surface, the cylindrical segment having an outside diameter slightly larger than an inside diameter of the cylindrical cavity; a longitudinal constriction extending from a lower surface of the cylindrical segment, the longitudinal construction having a first segment near to the cylindrical segment and having a diameter less than a diameter of the cylindrical segment, and a second segment extending to a tip of the plug, the second segment having a diameter greater than the first segment, the second segment having an annular groove with a cross-section complementary to a cross-section of the annular inward pointing boss of the cylindrical cavity; wherein the annular boss of the cylindrical cavity is configured to engage the annular groove of the plug when the plug is fully inserted into the casing.