Shear molding of reinforced latch

Details Shear molding of reinforced latch Shear molding of reinforced latch

1978-04-27

1979-05-22

Schulz, William E.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Cutter guided by or cooperating with peripheral edge of...

264163, 4253021, 425310, B29C 1714

Patent

active

041556925

ABSTRACT:
Containers are formed with latch openings and a reinforced region adjacent to each opening, molded in one operation from a softened sheet of organic polymer material. The latch opening is formed by vertical shearing of the sheet from a predetermined area of one of the mold dies during the closure of the molds. The sheared-off material is compressed against adjacent portions of the sheet to define a reinforced edge of the aperture. Accretion of sheet material adjacent the aperture region adds strength and rigidity to the container wall and eliminates removal of waste material separated during formation of the latch opening.

REFERENCES:
patent: 2953814 (1960-09-01), Mumford
patent: 3461761 (1969-08-01), Mojonnier
patent: 3845187 (1974-10-01), Dahlberg
patent: 3862817 (1975-01-01), Dahlberg
patent: 3917788 (1975-11-01), Padovani
patent: 3923948 (1975-12-01), Jackson et al.

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