Patent ID: 8381943

Claim:
An obturator for an opening of a predetermined outline disposed in a metal sheet, comprising: a generally planar cap having a peripheral rim adapted to face said metal sheet around a border of said opening when the obturator is disposed within said opening; at least one stiff wall transversely projecting from an underside of said cap; and at least one snap-fastening blade having a first free end and a second attachment end, and extending parallel to said underside of said cap, said at least one snap-fastening blade being in a resting position; a deformable elastic hinge element connecting said second attachment end of said at least one snap-fastening blade with said at least one stiff wall, wherein said snap-fastening blade is moveable parallel to said cap against elastic bias force from said deformable elastic hinge element thereby returning said at least one snap-fastening blade element back to said resting position when said obturator is disposed within said opening, said at least one snap-fastening blade having an insertion cant adapted to bear on the surface of said metal sheet delimiting said opening when the obturator is pushed within the opening, said insertion cant sloping relative to a direction transverse to said cap such that said snap-fastening blade is driven to displace to pass through said opening; wherein the slope of said insertion cant relative to said transverse direction progressively increases between said attachment end and said free end.