Patent ID: 6186513
Filing Date: 2001-02-13
Classification: F16J

Abstract:
A method of forming a metal gasket comprising the steps:preparing a first metal plate having a hole, an edge portion around the hole, and a base portion extending substantially throughout an entire area of the gasket and located outside the edge portion, andpressing at least two portions on one side of the first metal plate around the edge portion so that at least two annular grooves substantially concentrically to each other and an annular projection between the two annular grooves are formed on at least one side around the edge portion of the first metal plate by coining process, said annular projection being thickened by pressing said at least two portions so that the base portion located radially outside an outer groove in said annular grooves has a thickness greater than a thickness at the at least two annular grooves and less than a thickness at the annular projection.