Patent ID: 7484952
Filing Date: 2009-02-03
Classification: B29C

Abstract:
1. An airtight mechanism of a mold-holding unit for forming a vacuum environment around a held mold, comprising: a base section; an elongated support section, a first end of the support section being vertically fixedly connected with the base section; a top section bridged between a second end of the support section above the base section and in alignment therewith, a mold-holding space being defined between the top section and the base section, in which the mold is held; an airtight tubular chamber reciprocally linearly movable along an axes of the support section between an airtight position and an open position, whereby when positioned in the airtight position, the airtight tubular chamber is positioned in the mold-holding space around the held mold; a first closed end piece disposed on the base section, the first closed end piece having a first closed connecting loop, whereby a first end of the airtight tubular chamber in the airtight position coaxially airtight abuts against the first closed connecting loop; and a second closed end piece disposed on the top section, the second closed end piece having a second closed connecting loop, whereby a second end of the airtight tubular chamber in the airtight position coaxially airtight abuts against the second closed connecting loop.