Method of forming gasket with annular sealing projection and groove
AssigneeIshikawa Gasket Co., Ltd.
InventorTsunekazu Udagawa
Life of this patent
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Abstract
A metal gasket is formed of a 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. At least one annular projection and at least one annular groove are formed on at least one side of the edge portion of the metal plate as one unit. The annular groove is located between the annular projection and the base portion. The base portion of the metal plate has a thickness greater than a thickness at the annular groove and less than a thickness at the annular projection to thereby provide a surface pressure at the at least one annular projection.
Claims9
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, and
- pressing 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.
Dependencies are inferred from the claim text.