Molding die assembly for rubber members and rubber member...

Details Molding die assembly for rubber members and rubber member... Molding die assembly for rubber members and rubber member...

2007-06-05

2007-06-05

Johnson, Christina (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

C264S319000, C264S320000

Reexamination Certificate

active

10445669

ABSTRACT:
A molding die assembly includes an upper die and a lower die, wherein at least one of the upper and lower dies is provided with a cavity corresponding to the shape of a rubber member to be molded, wherein at least one of the upper and lower dies is provided with an annular projection around a cavity. The distance between the upper and lower dies at the annular projection is made smaller than the distance between the opposed surface portions, other than the cavity, of the upper and lower dies. A rubber member produced by the above mentioned molding die assembly is also provided.

REFERENCES:
patent: 2148079 (1939-02-01), Martin, Jr.
patent: 3957411 (1976-05-01), Schiesser
patent: 4036675 (1977-07-01), Amberg et al.
patent: 4252294 (1981-02-01), Uchio
patent: 4554125 (1985-11-01), Knapp
patent: 5078941 (1992-01-01), Tatsumi et al.
patent: 5217668 (1993-06-01), Matsuzaki et al.
patent: 2004/0099994 (2004-05-01), Brinkhues

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