Nozzle shut-off device

Details Nozzle shut-off device Nozzle shut-off device

1978-02-13

1980-07-15

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

425549, 425550, 425564, B29F 103

Patent

active

RE0303356

ABSTRACT:
In an injection molding apparatus, wherein a plasticizing chamber has a nozzle attached to one end thereof, with the nozzle having a passageway therein and being in communication with the sprue of a mold, the improvement which constitutes a compact, pneumatically-powered, reciprocable spool-type device having a passageway therein, operated by alternately actuated opposed pistons, interposed between the nozzle and the plasticizing chamber, in one position blocking the communication between the plasticizing chamber and the nozzle and in the other position allowing molten material to enter the nozzle.

REFERENCES:
patent: 2443554 (1948-06-01), DeMattia
patent: 2686934 (1954-08-01), D'Amore
patent: 2923031 (1960-02-01), Collion
patent: 2936996 (1960-05-01), Mercer
patent: 2972776 (1961-02-01), Siegrist
patent: 2992455 (1961-07-01), Solzmon
patent: 3354507 (1967-11-01), Orrevad
patent: 3377661 (1968-04-01), Corbett

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