US Patent 7159874 Sealing construction

A sealing construction provided with a plate member of metal and a rubber member forming a sealing portion and unitedly fixed to the plate member on which a ring concave groove is formed on an obverse face. And, plural through holes, having enlarged opening end portions on a reverse face, are formed through a bottom face of the ring concave groove and the reverse face. Further, a ring plate is disposed as to contact the bottom face of the ring concave groove and partially close the opening portions of the through holes toward the bottom face, and the rubber member, fit to the through hole and surrounding the ring plate, is unitedly connected to the sealing portion in the ring concave groove.