Plastic article or earthenware shaping or treating: apparatus – Sets of male-female press molds – Traveling female mold
Reexamination Certificate
2005-06-17
2008-10-07
Gupta, Yogendra (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Sets of male-female press molds
Traveling female mold
C425S412000, C425S809000
Reexamination Certificate
active
07431582
ABSTRACT:
A mold core includes a forming pin having a hollow interior and an end wall. A passage, preferably in the form of a hollow tube, extends into the hollow interior of the forming pin and has an end sealingly secured at a position spaced from the end wall of the forming pin. A poppet valve is disposed on the end wall of the forming pin. The poppet valve is responsive to air pressure within the passage to open and permit flow of air through the end wall of the forming pin to assist stripping of molded articles from the mold core. The poppet valve includes a valve element having an outer end at the end face of the forming pin and an inner end adjacent to the end of the passage. A spring preferably biases the valve element to a closed position. The spring preferably comprises a coil spring captured in compression between the valve element and the forming pin.
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Reed Vance E.
Rote B. Jack
Zorger Richard E.
D Ewald Maria Veronica
Gupta Yogendra
Reising, Ethington, Barnes, Kiselle, P.C.
Rexam Closure Systems Inc.
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