Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Reexamination Certificate
2005-02-22
2005-02-22
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
C425S562000, C425S563000
Reexamination Certificate
active
06857867
ABSTRACT:
A backflow prevention device for a plasticizing and injection screw axially movable in a plasticizing cylinder of an injection molding machine, includes a base body having a leading head portion and a trailing neck portion and formed with a channel for passage of plastic melt by the screw to an anterior screw space, whereby a check valve is disposed in the channel. Bearing against an inner wall of the plasticizing cylinder and axially moving between open and closed positions is a locking ring so positioned behind the head portion in the area of the neck portion as to define a gap with the base body. The locking ring has a leading stop surface in sealing contact with a confronting base of the head portion, when the locking ring is in open position, and a trailing stop surface in sealing contact with the pressure ring, when the locking ring is in closed position, wherein the inlet opening of the channel is so disposed in the base body that the leading stop surface of the locking ring is prevented from overlapping the inlet opening, when the locking ring is in open position.
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Demag Ergotech GmbH
Feiereisen Henry M.
Heitbrink Tim
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