DE3744832C2 - Easily produced sun visor for cars - Google Patents

Abstract

A vehicle sun visor is produced from a core and a textile covering, the latter being made first in the form of a pocket, turned, placed round the core, and closed off. At least two sheets of a fabric are laid together and their outer edges are ultra-conically welded together; when the resultant pocket has been turned and the core inserted, its opening is closed off by ultra-sonic welding again

Description

The invention relates to a method for producing a driving Stuff sun visor with a mirror made of a core and a cover textile fabric in which at least two cuts of textile Fabric with their outer sides lying together to form a bag be connected, the bag turned and after inserting the Kerns is closed.

Sun visors are used for cars with high-quality equipment reaches, the covers of textile materials, e.g. B. fabrics or Nonwovens exist, especially when the headliner is also made from such materials. According to the DE OS 31 05 851 can use such sun visors stretchable textile material from two halves forming the core bowls are made. The textile fabric turns umlau edge edges of the half shells bent and ver with these sticks. The two half-shells are then by Ver welding, gluing, clips or the like put together. Variants of this method are described in EP 58 742. What they all have in common is that the sun visor core unites them Has clamping area through which the textile fabric is fixed and is held. However, the complex ones are disadvantageous Process steps that lead to barely justifiable costs.

In DE-OS 31 28 853 is a manufacturing process for fabric related sun visors described, especially for unela is suitable. It finds a peripheral framework last application through which the image of a uniform upper area is lost, in the case of sun visors with plastic films  is so valued.

It is the same with a sun visor available on the market already known to sew a bag from a textile and thereby opening them after inserting the core conclude that the fabric edges are inserted between them by means of a brought together welding auxiliary foil by high frequency welding who are connected. Because such a weld ratio must be moderately wide to hold reliably, and full If the width protrudes from the sun visor, it interferes with the optical Impression, even if only on the top edge the sun visor has such outward sweat is near.

To avoid protruding edges on the sun visor, it is off DE-PS 9 49 143 also known, two blanks from texti lem fabric with their outer sides adjacent to each other to sew a pocket or alternatively two blanks Then weld plastic film together to form a bag turn the bag, insert a core and finally to close the bag on the open side. in the There is also the possibility of welding ability to trim the blanks.

Sewing a bag the size of a sun visor has as Manufacturing process the disadvantage that the sewing process along the Edges of the bag must advance, which is why he necessarily takes a certain amount of time, which is hardly ever shortened leaves. Also, when sewing, one would already be on one of the zu cuts in attached mirrors or mirror frames. That's why  have so far been the case for sun visors with textile covers gel glued afterwards. This process is complex and the mounting of the mirrors is often incorrect.

The invention has for its object a method of to create the type mentioned, which is manufacturing technically faster, easier and cheaper than the up lets carry out procedures used for this purpose and to a sun visor with a reliably attached mirror and an inconspicuous, but nevertheless durable seam place in relation leads.

The above object is achieved in that before joining the blanks, a skewer on one of them gel frame is welded on, then using Ultra be welded together and the opening of the turned Bag is also closed by means of ultrasonic welding.

The new process has the advantage that in large series the Manufacturing time to produce a bag compared to previously practiced sewing process can be significantly shortened can. Following the welding of the mirror frame is also the sequence of similar process steps advantageous. The welded mirror frame does not interfere with Welding the two blanks to the bag still at their Turn and close. It is in the finished state Weld in the pocket and thus affects the outer Impression not. Surprisingly, it only lasts from ver the existing seam welded the particularly unfavorable Ab peeling stress after turning the cover, and likewise the result was found unexpectedly that the ge  turned weld seam looks more even from the outside than a ge stitched seam.

Are used when closing the opening of the bag using Ultra sound weld the opening edges directly together welds, there is a very narrow, yet firm Weld that protrudes outwards but is so small that it does not stand out as disturbing at this point. Alternatively in the area of the opening of the bag, the edges of the zu cut into a joint, a slot or a clamping gap guided and by means of a sonotrode by ultrasound with the Core or a fixed part connected to this welded will.

The core of the sun visor can only be soft to a limited extent. A particularly softly padded version of a sun visor can but are obtained by the fact that between the core and the Upholstery fabric a weldable cushioning material, e.g. B. a location soft foam. In this case offers the invention a further advantageous embodiment variant, by namely at least one of the Zu during the welding process cuts simultaneously with a pole on the outside of it material is welded. This version of Ver driving is the prior welding of a mirror frame to one of the blanks.

The invention is based on the drawing he he purifies. It shows

FIG. 1 is a core of a vehicle sun visor;

FIG. 2 a cover matching the core according to FIG. 1 in the form of a prefabricated pocket into which the core is inserted;

Fig. 3 shows a cross section through the upper Randbe rich a sun visor while closing the opening of a pocket-shaped cover.

The core 10 of a sun visor shown by way of example in FIG. 1 is made in a known manner from foam plastic, into which a wire frame (not shown), a bearing 12 , a counterbearing 14 and an upper edge 16 of the core, which is only shown in section in FIG. 3, form Bar 18 are foamed. The strip 18 is made of plastic, preferably ABS. The strip can form an injection molding unit together with the bearing and counter bearing. It can extend to the counter bearing or can extend beyond it.

The cover which surrounds the core 10 in the fully assembled state of the sun visor consists of a textile material from which a pocket 20 according to FIG. 2 is first produced. It has an opening 22 at the upper edge, which must be sufficiently large to enable the core 10 to be inserted into the pocket 20 . At the edge, as the section BB of FIG. 2 shows, it has a weld seam 24 which runs all the way to the opening 22 and extends inwards. To accommodate them in the fully assembled state, the core 10 , as shown in section AA in FIG. 1, can be formed on the lower edge and on the side edges with a groove 26 dimensioned accordingly for the weld seam 24 .

The manufacture of the pocket 20 proceeds in such a way that a mirror frame (not shown) is first welded onto one of two blanks 28, 29 made of ultrasonically weldable textile material. Then the two blanks are placed one on top of the other in such a way that the textile fabrics face each other with the side which, when fully assembled, forms the outside of the sun visor. The two conditions 28, 29 are then placed between the sonotrodes and anvil. The shape of the sonotrodes corresponds to the shape of the pocket 20 . The textile fabric welds to one another during the welding process. The anchoring is so good that the connection does not come off during a heat test (120 °; 2 h) on the finished sun visor.

After welding, it is possible to trim the outer fabric edge. Then the bag is turned inside out or turned in such a way that the inside of the fabric 28 and 29 , which is inside during welding, is turned outside. It was found that the view of the weld from the outside is very clean, even if the weld is subjected to tension after turning.

After the core 10 has been inserted into the turned pocket 20 according to FIG. 2 through the opening 22 , the opening 22 still has to be closed. This is done in exporting approximately example of FIG. 3 in that the opening 22 bil Denden edges of the fabric panels 28, 29 and the bottom subsequent bore are inserted by machine in the bar 18 40 in a fenen up of longitudinal gap 38. For easy assembly, the gap width should be about 1.2 to 1.5 times the double layer of fabric. At the upper, bevelled edges 42, 43 , the material 28, 29 is then firmly connected by means of ultrasound welding with the plastic guide 18 by means of a sonotrode 44 .

In the case of less elastic textile materials, it can be provided that the plastic strip 18 extends over the bearing 12 and the counterbearing 14 so that a sufficiently large opening 22 is obtained in order to be able to insert the core 10 into the pocket 20 . In this case, it is advisable to use a two-part strip 18 instead of a one-part strip, a vertical middle parting line being present. The two parts of the bar are e.g. B. buttons to connect with each other by clips in the manner of pressure. The ultrasonic welding takes place here before clipping the two Lei stentteile.

The direct weld connection of the fabrics has such a high strength that a very narrow weld seam is sufficient which, with reference to FIG. 3, projects upwards from the sun visor (not shown). It is understood that with this direct ultrasonic welding of the substances 28, 29 one or more sonotrodes 44 and an associated anvil in a position rotated by 90 ° with respect to the position of the sonotrode 44 , ie to be brought into approach with a horizontal direction of movement .

In the meantime it has been proven by further practical tests that the weld 24 described above can also be kept so narrow that no special measures are required on the part of the core 10 because of it. A groove 26 for receiving the weld seam 24 is therefore not absolutely necessary.

It is understood that the invention is independent of the external shape and structure of the core 10 . There is also a large selection of textile materials 28, 29 which can be connected to one another in the manner described by a hidden weld seam. In an exemplary embodiment, the textile fabrics 28, 29 z. B. from a polyester or polyamide or other plastic fabric, optionally mixed with cotton, be available. Because of the weldability with ultrasound, however, the proportion of plastic in the fabric should generally not be less than about 30%.

Claims (4)

1. A method for producing a vehicle sun visor with a mirror made of a core and a cover made of textile material, in which at least two cuts of the textile material are connected to one another with their outer sides to form a pocket, the pocket is turned over and is closed after inserting the core, characterized in that before connecting the blanks, a mirror frame is welded onto one of them, they are then welded together by ultrasound welding and the opening of the turned pocket is also closed by means of ultrasound welding. 2. The method according to claim 1, characterized ge indicates that the welded to cuts trimmed in outline before turning the bag will. 3. The method according to claim 1 or 2, characterized ge indicates that we at least one of the blanks simultaneously with an au is welded to the upholstery material attached to it. 4. The method according to any one of claims 1 to 3, because characterized in that in Be reach the edges of the blanks at the opening of the pocket with the core or a solid connected to it Part to be welded.