Injection head

Details Injection head Injection head

1991-02-05

1992-06-30

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

2643288, 26432813, 425562, 425564, B29C 4513

Patent

active

051258170

ABSTRACT:
In the nozzle tip at the tip of an injection head, a first conical hole, an inner sealing portion and a second conical hole are formed in series. An inside torpedo is slidably guided in the inner hole of the outside torpedo. A sealing surface is formed on the outer peripheral surface of the front edge portion of the inside torpedo. The inside torpedo has a hole communicating the center of the front edge portion with the outer peripheral surface of the rear edge portion of the inside torpedo. A sealing portion is formed in the rear edge position. The position of the opening at the outer peripheral surface of the rear edge portion of the communicating hole of the inside torpedo is set at a position such that upon the forward movement of the inside torpedo, when the insertion of the sealing surface of the inside torpedo into the inner sealing portion is started, the opening is not inserted into the inner hole of the outside torpedo, and just before the inside torpedo reaches the limit of its forward movement, the opening is inserted into the inner hole of the outside torpedo and is completely closed.

REFERENCES:
patent: 3947175 (1976-03-01), Melcher
patent: 4117955 (1978-10-01), Sokolow
patent: 4685881 (1987-08-01), Sasaki
patent: 5030076 (1991-07-01), Ebenhofer

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