Stock material or miscellaneous articles – Structurally defined web or sheet – Fold at edge
Patent
1997-04-23
1998-11-24
Thomas, Alexander
Stock material or miscellaneous articles
Structurally defined web or sheet
Fold at edge
494901, E06B 723
Patent
active
058404015
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sealing profile for sealing an opening of a motor vehicle.
In one known sealing profile of this type, as shown in German patent DE 28 42 207 A1 (page 5, column 2), a sticky element of non-vulcanized rubber, for example butyl rubber (page 3, column 3), can be provided on the inside of the bridge. This rubber can be compressed only with comparative difficulty upon the fitting of the sealing profile on the flange such that undesirably high push-fitting forces result. Since the element should be unvulcanized, it can be made to adhere to the inside of the bridge only after the vulcanization of the sealing profile in an expensive, additional working step. Moreover, this must be carried out before the limbs of the U-shaped retaining part of the sealing profile are bent into their fitting positions. The known element can therefore not be used where the retaining part is given its U-shaped fitting shape either before or in the injection head of the extruder.
A similar proposal is known from DE 32 27 885 A1, FIG. 3. Here, a chamber of the retaining part which has previously been vulcanized in the customary way is lined with an evidently pasty butyl rubber part. The specification of the German document describes the disadvantages of this structure in the paragraph bridging pages 6 and 7. Since the chamber is smeared with the paste, the known flange covering cannot be further used after an adjustment.
From DE 31 47 801 A1 there is known a profile strip for sealing around the borders of windows. The receiving groove for the window is made in an EPDM profile. Since EPDM has very weak adhesive properties, a very thin surface layer of an adhesive-friendly rubber mixture is vulcanized onto the material in the receiving groove, with this rubber mixture being polar but not self-adhesive. For the assembly, rather a polar adhesive which sticks on the other hand to the window is additionally applied to the surface layer.
From DE 41 21 552 A1 it is known to conceal the visible surface of the retaining part with a strip of textile. For this, a first adhesive layer is coextruded onto the visible surface. The strip of textile is overlaid with a second adhesive layer of thermoplastic resin. For the concealment, the two adhesive layers are connected to one another by the application of pressure and heat.
From DE 33 46 070 A1 it is known to provide at least one limb of the U-shaped clamping region of the sealing profile with a pivotable extension of elastomeric material. The inner face of this which faces the flange is coated with a layer of adhesive. Upon the fitting, the extension is pivoted inwards, so that the layer of adhesive produces a fixed and sealing connection between the flange and the clamping region. In the embodiment shown in FIG. 3 of that reference, only a comparatively small clamping zone with adhesive extensions on the two limbs is used. Here, an adhesive layer can be provided on the inner face of the bridge (page 8, lines 26 and 27 and page 9, lines 6 to 9) for the fixing and centering during the fitting. Again, all these adhesive layers can first be positioned on the clamping zone only after the vulcanization of the sealing profile. This has the consequential disadvantages described above.
From DE 29 24 574 C2 it is known to provide a thin layer of heat-responsive material on the inside of the U-shaped retaining part in an additional working step after the vulcanization and before the bending together of the limbs of the retaining part. The layer consists for example of polyamide or ethylene-vinyl-acetate and extends from a retaining lip on the one limb, across the bridge, and as far as a retaining lip on the other limb. The retaining lips are intended to prevent an outward flow of the material layer during storage or during supply to the customer (column 2, lines 39 to 44). The fitter presses the retaining part onto a (bodywork) flange and then supplies heat from the outside to the retaining part, until the material foams at 70.degree. to 120.degree. C. and expands and the whole space b
Meteor Gummiwerke K. H. Badje GmbH & Co.
Thomas Alexander
LandOfFree
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