Device for producing cross-finned pipes

Details Device for producing cross-finned pipes Device for producing cross-finned pipes

1999-06-28

2001-10-30

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Sets of press couples comprising registering female mold...

C425S326100, C425S336000, C425S384000, C425S388000, C425S392000, C425S396000

Reexamination Certificate

active

06309205

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention concerns an apparatus for the production of transversely ribbed tubes, which has mold jaw halves which bear against each other along a common mold section with front faces and form a mold passage, wherein each mold jaw half has a cooling passage.
An apparatus of that kind is known for example from DE 25 37 184 A1. In that known apparatus the cooling passages in the individual mold jaws are embodied by bores which are connected at one end to connections for a cooling agent and which at the other end are sealingly closed. Producing the cooling passages in the mold jaw halves requires precise operations and involves an expenditure of time, which has a corresponding effect on the production costs of the mold jaw halves.
German published specification (DE-AS) No 2 065 048 discloses an apparatus for the production of transversely ribbed tubes, in which the mold jaw halves have both cooling passages and also vacuum passages. In that known apparatus, all those passages are also implemented by means of bores so that in this case also there are the deficiencies which have already been described above in connection with DE 25 37 184 A1.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an apparatus of the kind set forth in the opening part of this specification, wherein the mold jaw halves with the cooling passages can be comparatively easily produced.
In accordance with the invention, in an apparatus of the kind set forth in the opening part of this specification, that object is attained in that the cooling passage of the respective mold jaw half which is produced in a casting procedure has at a first surface a cooling agent feed means and at a spacing therefrom a cooling agent discharge means and, produced directly in the casting procedure, it extends to a second surface, which is different from the first surface, of the corresponding mold jaw half, wherein fixed to the respective second surface is a guide and slide element by which the cooling passage is sealed off at the second surface.


REFERENCES:
patent: 3776679 (1973-12-01), Hegler
patent: 4492551 (1985-01-01), Hegler et al.
patent: 4718844 (1988-01-01), Dickhut et al.
patent: 5059109 (1991-10-01), Dickhut et al.
patent: 5141427 (1992-08-01), Hegler et al.
patent: 5531583 (1996-07-01), Berns
patent: 5573787 (1996-11-01), Lupke et al.
patent: 6149421 (2000-11-01), Kossner
patent: 2065048 (1972-06-01), None
patent: 2537184 (1977-03-01), None
patent: 0435446 (1991-07-01), None
patent: 0621120 (1994-10-01), None

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