Mechanism for making openings in plastic parts within a mold...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/56 (2006.01) B29C 45/26 (2006.01)

Patent

CA 2441167

An assembly disposed within a mold for forming openings in a plastic part includes a punch pin (32) and a backing pin (22) having faces disposed flush with a surface of a mold cavity (20). The backing pin (22) is disposed opposite the punch pin (32). The punch pin (32) is driven into the completed plastic part removing material to form an opening. The waste material is driven into a bore (30) housing the backing pin (22). The backing pin (22) recedes into the bore (30) to accept the waste material. Upon ejection of the plastic part the waste material ejects from the mold cavity (20) as the backing pin (22) moves back to a position flush with the surface of the mold cavity (20).

L'invention concerne un ensemble placé dans un moule pour former des orifices dans une pièce en plastique, qui comprend un poinçon (32) de perforation et une tige (22) d'éjection présentant des faces affleurant une surface de cavité (20) de moule. La tige (22) d'éjection est placée à l'opposé du poinçon (32) de perforation. Le poinçon (32) de perforation est entraîné dans un élément en plastique achevé afin de former un orifice par élimination de matière. Les déchets sont entraînés dans un logement (30) contenant la tige (22) d'éjection. La tige (22) d'éjection est rétractée dans le logement (30) de manière à pouvoir recevoir les déchets. Lors de l'éjection de l'élément en plastique, les déchets sont éjectés hors de la cavité (20) de moule au moment où la tige (22) d'éjection revient à une position affleurant la surface de la cavité (20) de moule.

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