Device and process for producing the corners of sealing frames

Details Device and process for producing the corners of sealing frames Device and process for producing the corners of sealing frames

1995-09-22

1997-07-15

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264264, 2643281, 425111, 425123, 425127, B29C 4514, B29C 3300, B29C 6570

Patent

active

056480369

ABSTRACT:
Device consisting of an inner mold (15), an outer mold and at least one injection aperture arranged in the outer mold; for the manufacture of the corners of sealing frames, in particular tunnel sealing frames consisting in most cases of four assembled strand-shaped sealing profiles made of elastomeric material, whereby each sealing profile has open and/or closed grooves extending in the longitudinal direction and arranged on the profile base side, as well as additional ducts also extending in the longitudinal direction and disposed between the grooves and the profile back surface; whereby the manufacture of the corners of the sealing frames takes place according to the injection molding process. The essence of the invention lies in that the inner mold (15), viewed from the corner (16), is provided on both sides (17, 18) with additional mold inserts (24) as stops for the sealing profiles, whereby the mold inserts have bridges (25, 26) and pins (27, 28, 29) extending in the opposite direction to the corner (16) of the inner mold and, during the manufacture of the frame corners, close on the profile face all or at least part of the ducts. Introduced are another process variation as well as corresponding processes.

REFERENCES:
patent: 4352772 (1982-10-01), Bezner
patent: 4824289 (1989-04-01), Glang et al.
patent: 4964620 (1990-10-01), Omura et al.
patent: 5069849 (1991-12-01), Wain
patent: 5127193 (1992-07-01), Okada et al.
patent: 5256361 (1993-10-01), Keys
patent: 5258157 (1993-11-01), Nozaki et al.

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