FR3045507A1 - OCCULTATION STORAGE FOR A KNITTED KNITTED VEHICLE - Google Patents

Abstract

Blind for a motor vehicle, comprising a shade cloth (11) whose first end is secured to a winding tube (12) and a second end is secured to a draw bar (13) guided along two rails parallel (14, 15). Said fabric (11) is made using an inextensible yarn, and obtained from a knit mesh.

Description

Blackout blind for mesh knit car picked 1. Domain

The field of the invention is that of the equipment of motor vehicles, and in particular vehicles having a large glazed surface, in particular at the level of the flag and / or the rear window.

More specifically, the invention relates to devices for concealing a glass surface of complex shape, including non-parallel rails. 2. Prior Art

Floor-to-ceiling windows have become essential elements of modern motor vehicles. Housed in the bodywork, they offer users new design vehicles and bright interior. In particular, pavilions of vehicles with increasingly large glazed surfaces, corresponding, where appropriate, to all or an essential part of the pavilion are proposed.

In order to protect the occupants of the vehicle from the light radiation and the heat in particular, and to enable them to manage the contribution of luminosity within the passenger compartment, such lodges are equipped with means of occultation, and by example of blackout blinds.

Many types of glazed shade blinds are known from the prior art. The blackout blinds generally comprise a fabric capable of wrapping around a winder, and unwinding, so as to respectively discover or cover the glass surface of the roof. The end of the fabric is attached to a draw bar, extending between two guide rails, so as to be guided in a translational movement. The drive of the drawbar can be manual or motorized.

In many vehicles, the glass surfaces of the pavilions are not rectangular, but of more complex shape, in particular essentially trapezoidal, adapted to the vehicle, according to aesthetic criteria, for example.

In this case, especially to have the bay clear the largest possible, the rails for guiding the draw bar are adapted to follow, as far as possible, the edges of the glass surface, and are therefore not parallel. Often, the rails gradually move away from each other, from the rear to the front of the vehicle, so that the gap between the rails at one end of the roof (usually the front end) is more wide than at the other end of the roof (usually the rear end).

This poses various problems for the unwinding and rolling of the fabric. First, the length of the drawbar must vary, to accommodate the varying gauge of the rails. Then, in the same way, the width of the occultation means must vary, if one wishes an effective concealment.

Indeed, if we consider that the narrowest part (the gap between the rails is the weakest) is the area where the winding tube is located, it is understood that the fabric can not be wider than the length of this tube reel. Consequently, when it is deployed, lateral zones of the flag, essentially in the form of a triangle, are not obscured, in the part where the rails are the furthest apart from each other (generally the front part of the vehicle ).

To overcome this problem, it has been proposed several approaches to compensate for the variation of the gap between the rails during unwinding (or winding) of the fabric, using complementary means of occultation, occulting these lateral areas. In general, these complementary means assume an element other than the fabric, for example, in the form of a flap or another portion of fabric, for example deployed by means of the draw bar. The disadvantage of these systems is that they are relatively complex and bulky (harming the bay clear when they are not deployed), and that, aesthetically, the deployed set is not uniform.

Another known technique, for example from patent document EP1449692, implements an elastic web in width.

It has also been proposed that only a lateral portion of the fabric, along the rails, be elastic, which presupposes sewing to a principal portion of fabric these lateral elastic portions.

A disadvantage of these elastic fabrics is that they must use elastic filaments, conventionally elasthane, whose durability is not satisfactory for a motor vehicle, which can be used for many years. Indeed, these fibers have a relatively short life, and tend to harden and break, especially when exposed to the sun, which can be the case for a long time in a motor vehicle. When these filaments break, the canvas tears, and the blind becomes unusable. 3. Objectives of the invention The object of the invention is to overcome at least some of these disadvantages of the prior art.

More specifically, an object of the invention is to provide a blackout blind with non parallel rails for motor vehicles, which does not require the implementation of occultation elements complementary to the fabric, to compensate for the absence of parallelism of the rails.

Another object of the invention is not to use a fabric using elastic son, to ensure sufficient longevity.

Another object of the invention is to provide such a blind, which is 4. Main or optional features of the invention

These objectives, as well as others which will appear later, are achieved according to the invention with the aid of a blind for a motor vehicle, comprising an occluding cloth whose first end is secured to a winding tube and a second end is secured to a draw bar guided along two non-parallel rails.

According to the invention, said fabric is made using an inextensible yarn, and obtained from a knitted mesh.

The term "inextensible" must be understood here in the "non-elastic" direction, as opposed to elastic threads, for example in elastane, it being specified that it may have a certain extensibility related to its texturing (extensibility related to the mechanical construction of yarn), but not to its molecular construction (as for elastane). It is therefore a thread without particular elasticity.

Thus, according to the invention, the necessary elasticity of the fabric, to adapt to the variable gauge of the rails, is not ensured by the elasticity of the wire used, but by the implementation of a knitting particular, to achieve a similar effect without the disadvantages of elastic wire.

In particular, said fabric may be a cross-stitched jersey.

According to a particular embodiment, said yarn is a multi-filament yarn, and in particular a twist of two textured yarns, which may comprise, for example, 128 filaments.

Moreover, said wire is preferably a wire "not fire", to meet the requirements of the automotive field.

According to a particular embodiment, said fabric is covered by coating.

This makes it possible to increase the occultation efficiency of the fabric. The invention also relates to a method of manufacturing a shade cloth for a blind of a motor vehicle as described above. Such a method notably comprises the steps of: obtaining an inextensible yarn; mesh knitting picked from said yarn, to form said shade cloth.

According to a particular embodiment, said knitting step uses a simple circular needle loom.

According to a particular embodiment, the manufacturing method further comprises a step of coating said occulting cloth. 5. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and nonlimiting example, and the accompanying drawings, among which: Figure 1 illustrates an example of non-parallel rail blind according to the invention; Figure 2 schematically illustrates the knitting implemented according to the invention; Figure 3 is a simplified flowchart of an exemplary method according to the invention. 6. Description of a particular embodiment of the invention

As indicated above, the invention relates to a blind for a motor vehicle with non-parallel rails, for example of the type illustrated in Figure 1 (the fabric being in the folded position).

The blind comprises a blackout cloth 11, a first end of which is secured to a winding tube 12. The other end of the blackout cloth 11 is secured to a draw bar 13, the ends of which are guided by along two rails 14 and 15, which are not parallel, to follow, as far as possible, the side edges of a glazed flag.

These rails 14 and 15 are not parallel (they are further apart at their end opposite the winder), the length of the pull bar 13 must vary gradually. For this, it is, for example, made of two or more telescopic elements, sliding relative to each other.

The displacement of this draw bar 13 may be manual and / or motorized, for example, by a motor, driving "push-pull" cables flowing in the rails and connected to the draw bar.

According to the invention, no additional element is necessary to compensate for the variation in spacing between the rails. This compensation is provided by the canvas. However, it is not a canvas made using an elastic yarn: the elasticity is obtained by a particular knitting, using an inextensible yarn. As stated above, this term means, in the present patent application, that the yarn is not elastic. It may, however, have a slight extensibility related to its texturing.

This approach runs counter to the a priori of those skilled in the art, who thought that the use of elastic threads was necessary, and required important research to determine the proper knitting mode, to allow elasticity to be obtained. at least 10% (lengthening of 10 cm for a rest length of 1 m).

According to a particular embodiment, the yarn used is a twist of two multifilament textured yarns, according to an assembly SZ. According to another embodiment, the yarn may be a twister of two single yarns, a single S yarn and a single Z yarn. It is preferably a non-flammable yarn ("fireproof"), for example example in polyester.

As illustrated in Figure 2, the knitting implements a quilted stitch, and more specifically a gathered stitch (horizontal knitting), with a cross-type guilloche binding. So we use a four-line construction base, as shown in Figure 2.

A light knit is thus obtained, on a stocking jersey base, made, for example, on a simple circular needle loom.

This type of knitting is known per se, in the field of clothing (it is for example the knit used for Lacoste polo shirts (registered trademark)). However, there is no incentive for a person skilled in the art to use it for a blind fabric of a motor vehicle, in the particular case of a fabric having to have a high elasticity, for example from minus 10%, and with special constraints, due to both the winding and the possibility of staying in tension and exposed to the sun for very long periods.

In addition, a coating can be made on the fabric to completely obscure, or at least more effectively, as needed.

As mentioned above, the manufacture of this fabric can implement a circular loom, and include the steps illustrated in Figure 3.

The result is (31) a textured yarn, from which a knitted gathered knitting (32) is performed on a simple circular needle loom. This allows to obtain a knitted cylinder, which will be cut (34) to be adapted to the dimensions of the blind.

Beforehand, knitting processing steps, such as washing, dyeing, drying, coating (33 - dotted because optional), control, can of course be implemented as needed.

Claims (10)

Motor vehicle blind, comprising a shade cloth (11) having a first end secured to a winding tube (12) and a second end secured to a draw bar (13) guided along two non-parallel rails (14,15), characterized in that said fabric (11) is made using an inextensible yarn, and obtained from a knitted mesh. 2. Blind according to claim 1, characterized in that said fabric (11) is a cross-stitched jersey. 3. Blind according to any one of claims 1 and 2, characterized in that said wire is a multi-filament yarn. 4. Blind according to claim 3, characterized in that said wire is a twist of two textured son. 5. Blind according to claim 3 or 4, characterized in that said wire comprises 128 filaments. 6. Blind according to any one of claims 1 to 5, characterized in that said wire is a non-fire wire. 7. Blind according to any one of claims 1 to 6, characterized in that said fabric (11) is covered by coating. 8. A method of manufacturing a shade cloth for a blind of a motor vehicle, said shade cloth (11) having a first end secured to a winding tube (12) and a second end integral with a draw bar (13) guided along two non-parallel rails (14,15), characterized in that it comprises the steps of: obtaining (31) an inextensible yarn; knitting (32) meshes picked from said yarn, to form said awning fabric. 9. A method of manufacturing a shade cloth according to claim 8, characterized in that said knitting step uses a single circular needle loom. 10. A method of manufacturing a blind fabric according to any one of claims 8 and 9, characterized in that it comprises a coating step (33) of said shade cloth.