Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1989-10-13
1991-02-05
Heitbrink, Timothy
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
2643288, 2643289, 26432816, 264572, 425562, 425564, 425566, 425577, B29C 4522
Patent
active
049900838
ABSTRACT:
A nozzle located in an injection mold for injecting a first medium into a mold cavity containing a second medium. The injection molding has a first bore connected to a first mold surface via a second bore. An outer blowing needle having a first terminal end is located within the first and second bores. An inner blowing needle having a second terminal end is located within the outer blowing needle and has at least one opening near the second terminal end which communicates with the second bore. The inner blowing needle is axially displaced relative to the outer blowing needle and the first and second bores of the injection mold via a stop-spring arrangement such that the second terminal end of the inner blowing needle moves from a first position even with the first terminal end of the outer blowing needle to a second position located between the opposed first and second mold surfaces and back to the first position, to allow the first medium to be injected into the second medium when the second terminal end is in the second position. The inner and outer blowing needles are axially displaced relative to the first and second bores when the second terminal end is moved back to the first position via a stop spring arrangement such that the second terminal end of the inner blowing needle and the terminal end of the outer blowing needle are moved to a third position even with the first mold surface to ensure a smooth and seamless mold cavity.
REFERENCES:
patent: 4101161 (1978-07-01), Friedrich
patent: 4740150 (1988-04-01), Sayer
patent: 4917594 (1990-04-01), Gellert
Heitbrink Timothy
KnoFerromatik Desma GmbH
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