Device for applying a plastic sheathing to a pipeline at...

Details Device for applying a plastic sheathing to a pipeline at... Device for applying a plastic sheathing to a pipeline at...

2005-01-18

2005-01-18

Davis, Robert B. (Department: 1722)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

C264S271100, C264S327000, C425S116000, C425S123000, C425S129100, C249S079000, C249S111000

Reexamination Certificate

active

06843950

ABSTRACT:
The invention relates to a device for the plastic sheathing of connections, which are produced by circular weld seams, of a pipeline comprising steel pipes which are provided with a factory-fitted plastic insulation and are reinsulated in the region of the circular weld seam by injection molding, having a split injection mold, which can be connected to an injection-molding fixture and, in the region of the weld seam, can be laid and secured, in the manner of a sleeve, around the steel pipes in such a manner that the injection mold in each case covers the end of the factory-fitted plastic insulation of the two steel pipes which have been welded together, the injection mold having an internal diameter, at least in the axial region between the factory-fitted plastic insulations, which corresponds to the external diameter of the plastic sheathing which is to be produced in the region of the weld seam and having an internal diameter, at its ends, which corresponds to the external diameter of the factory-fitted plastic insulation. In this device, in each case one cooling means, which runs in the circumferential direction, is arranged in the region of the ends of the injection mold.

REFERENCES:
patent: 1650260 (1927-11-01), Candler
patent: 2759231 (1956-08-01), Parlanti
patent: 3593391 (1971-07-01), Routh
patent: 3964845 (1976-06-01), Duggan et al.
patent: 4145176 (1979-03-01), Nelson
patent: 4204896 (1980-05-01), Richardson
patent: 5238615 (1993-08-01), Stoor
patent: 5397229 (1995-03-01), Kitano
patent: 5407340 (1995-04-01), Daguet et al.
patent: 04290712 (1992-10-01), None

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