Movable extractor plate assembly for rapidly removing articles from a thermoforming apparatus
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Oct 19, 1995
filing date -
Oct 19, 1995
priority date (Note) -
Expired
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Abstract
A thermoforming apparatus having a plurality of dies for forming a plurality of thin walled plastic articles in combination with an improved movable extractor plate assembly for moving an extractor plate between the plurality of dies of the thermoforming apparatus to remove formed articles is described. The movable extractor plate assembly includes an extractor plate having a vacuum chamber connected to the outlet end of a vacuum source and having at the inlet end of the vacuum source a pressure control valve and a vent valve between the vacuum source and pressure control valve. The assembly permits the control of pressure to the vacuum chamber to provide holding contact of articles formed onto the extractor plate without deformation of the thin walled articles. Additionally, the assembly permits the injection of air pressure into the vacuum chamber upon closing of the vacuum source to facilitate release of the formed articles from the extractor plate.
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