DE2853767A1 - PROCEDURE FOR SEALING LIGHTS OR HEADLIGHTS OF MOTOR VEHICLES OR THE LIGHTS. - Google Patents

Description

Method for sealing lights or headlights of motor vehicles or the like

The invention relates to a method for sealing lights or headlights of motor vehicles or the like. or for the mutual sealing of any other components in the automotive industry or others Industries.

So far, between two parts of a motor vehicle headlight, e.g. between the diffuser and the reflector or between the reflector and the incandescent lamps version »sealed by the fact that between the two Parts of a seal made of rubber or an elastomeric plastic, such as in particular polyurethane, are used will. This seal must be manufactured separately, then inserted and then attached to one to accommodate it glued into one of the two parts in a suitable place. These operations are time consuming and difficult rig to perform.

The invention provides a remedy here in that an open or closed cell at the point to be sealed Polyurethane is sprayed or extruded directly under such conditions that you get a complete Adhesion to one of the components to be connected and

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a compliant contact is achieved without sticking to the other component, which when connected to the first component delimits a sealed space with this.

Further features and advantages of the invention emerge from the claims and the description below in conjunction with the drawing, on the basis of which two exemplary embodiments of the subject matter of the invention explained. In the drawing show:

1 shows a detailed section through an injection mold for producing a polyurethane seal according to a known method,

2 shows a cross section through such a polyurethane seal,

3 shows a detailed section of a headlight

with the seal used according to the known method according to FIG. 2,

H shows a detailed section of the headlight with a seal inserted according to a first exemplary embodiment of the invention,

Fig. 5 is a detailed section to illustrate a modification of the imple mentation form of FIG. H, and

6 shows a detailed section of the headlight according to a further embodiment

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ORIGINAL INSPECTED

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the seal used in the invention.

To form seals of any shape from open- or closed-cell polyurethane press or Injection molds in Pig. I used type shown. That in the space 1 between the cartridge 2 and the Mold 3 injected polyurethane has the property of adhering firmly to the metal when it is injected, and in order to be able to remove it from the mold at all, the walls of the cavity 1 must have a non-stick layer 4 made of tetrafluoroethylene or Teflon.

The seal shown at 5 in FIG. 2 can thus be removed from the mold. Once removed from the mold, the polyurethane forms in Contact with air quickly forms a skin 6 on its surface, which is attached to the materials on which the seal is attached is no longer adhesive.

If the seal 5 is inserted into a receiving space or a seat 7, which is for example in a reflector 8 of a Headlight (Fig. 3) is incorporated, so it is due to the fact that they are no longer adhesive is required to glue it on its seat at 9. The disk 10 of the headlight, which is on the skin supports, does not adhere to the seal 5, so that the removability of the disc is guaranteed.

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ORIGINAL INSPECTED

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The known method thus requires the production of the seal 5 in a Teflon-lined Injection mold, then its demolding, the application of the Adhesive 9 in the receiving space 7 provided for receiving the seal and finally the insertion the seal in this receiving space. Overall, this is very labor-intensive.

In contrast, in the method according to the invention the Polyurethan.11 is injected directly into the receiving space 7 of the reflector 8 (Fig. 4) by either the reflector 8 inserted into a mold or, preferably, a polyurethane strand 11 directly into the receiving space 7 is einextrudiert in a device which is set up so that the extruder nozzle exactly the scope of the recording space 7 under the regulation of can follow extruded amount of polyurethane to achieve a seal with a constant cross-section.

In the case of direct extrusion into the space 7, the adhesive property of the polyurethane occurs when it is introduced fully effective and the seal 11 thus adheres extremely firmly to the bottom of the space 7 without this requires the use of some kind of adhesive.

As soon as the extrusion process is finished, it forms very quickly the skin 6 on the surface of the with air

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OR'GfNAINSPECTED

In contact with polyurethane 11, and the disc 10 can then against the seal 11 to Plant can be brought without adhering to this.

In a modification of this embodiment of the invention the polyurethane 11 can be extruded into a space 12 of the disc 10 (FIG. 5). The liability represents then occurs at the moment of extrusion between the space 12 of the disc 10 and the polyurethane 11. The seal then quickly forms the skin 6 on the air-contacting surface and the reflector 8 can be attached to the seal without the risk of sticking to it.

The embodiment of the invention according to Fig. ^ and FIG. 5 applies when the disc 10 is to be acceptable from the reflector 8.

In the case of headlights for which this type of detachability is not required because, for example, the light bulb from the back of the headlight can be solved and on the other hand a permanent and tight fastening the disc on the reflector is required, the second embodiment of the invention shown in Fig. 6 is used.

The polyurethane forming the seal 13 is then laterally jjiRich ± un £ _desPfeils_JjL_zM5c & ^^

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and 16 of the disc 10 and the reflector 8 are extruded. The disc or reflector has a projection on, which limits the extrusxons area of the polyurethane 13 in the lateral direction.

Due to the adhesive properties of the polyurethane during its extrusion, it adheres or sticks firmly to the walls 15, 16 and 17, whereby the disc 10 and the reflector 8 are firmly and tightly united with one another.

The elasticity of the polyurethane allows a "displacement of the disc in relation to the reflector, what Glass breaks under the effect of vibrations or thermal expansion prevented.

The skin 18, which then forms on the side surface of the seal 13, enables easy handling the structural unit as well as its correct adhesive or adhesive support on a collar or plan of the body or forms a raised decorative strip.

The invention extends to all arrangements that differ only in the shape of the individual parts however, the process of injecting or extruding polyurethane directly into a space of these parts use. The invention extends to all of them

9825/0802

ORIGINAL INSPECTED

Mutually tight connections between two parts, even with other motor vehicle parts than headlights and lights as well as any other industrial components.

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Claims (2)

Societe de Signalisations Automobiles SEIM 32, Rue de Paris, Saint Clement, Sens (Yonne), France Busse & Busse Patent Attorneys Dipl.-Ing. Dr. iur. V. Busse Dipl.-Ing. Dietrich Busse Dipl.-Ing. Egon Bünemann D-4 500 Osnabrück Großhandelsring β ■ Postfach 1226 Telephone (0541) 586081 and 586082 Telegrams: patgewar Osnabrück December 11, 1978 L / Ri Patent claims: 1. Method for sealing lights or headlights of motor vehicles or the like or for mutual sealing of any other components in the motor vehicle industry
or other branches of industry, characterized in that At the point to be sealed, an open-cell or closed-cell polyurethane is sprayed or extruded directly under such conditions that a complete
Adhesion to one of the components to be connected and a resilient system without adhering to the other component is achieved, which when connected to the first component with this
delimits a sealed space. 2. The method according to claim 1, characterized in that the polyurethane is directly in a receiving space of one of the
two components to be connected is injected by For example, a reflector or a lens of a headlight is used in a mold, or that a polyurethane strand
is extruded directly into the receiving space. 909825/0802 ORIGINAL INSPECTED 3, method according to claim 2, characterized that the direct extrusion of the polyurethane is carried out by means of an automatic device in which the Extruder nozzle exactly follows the circumference of the receiving space and wherein the amount of extruded polyurethane is regulated to achieve a seal with a constant cross-sectional profile will. Method according to one of claims 1 to 3, characterized in that the polyurethane due to its adhesion properties when applied rit the one component is firmly connected and the subsequent attachment to second component cooperating with the first component to form a detachably sealed space is made in the non-adhesive skin, which Dei the polyurethane immediately when touched forms with air. Process according to Claim 1, characterized in that the polyurethane is extruded on one of the two u connecting components made unit formed in a limited by tfandgebiete these components receiving space the adhesion of the polyurethane at the moment of its extrusion to the two at the same time components takes place and this tightly and inextricably united, but a relative movement of the two components inter the influence of vibrations or thermal expansion 909825/0802 allows. Method according to Claim 5, characterized that which is on the surface of the previously in the unity The skin forming an extruded seal between the two components has a light weight due to its non-adhesive property Handling of the unit or its sealing and releasable assignment to a third component brings about. 909825/0802