FR2915156A1 - Covering skin for fascia of motor vehicle, has weakened portion defined by weakened line that is formed by notch arranged in skin, on side opposite to outer surface of covering element of motor vehicle - Google Patents

Covering skin for fascia of motor vehicle, has weakened portion defined by weakened line that is formed by notch arranged in skin, on side opposite to outer surface of covering element of motor vehicle Download PDF

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Publication number
FR2915156A1
FR2915156A1 FR0754514A FR0754514A FR2915156A1 FR 2915156 A1 FR2915156 A1 FR 2915156A1 FR 0754514 A FR0754514 A FR 0754514A FR 0754514 A FR0754514 A FR 0754514A FR 2915156 A1 FR2915156 A1 FR 2915156A1
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France
Prior art keywords
skin
covering
notch
motor vehicle
blade
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Granted
Application number
FR0754514A
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French (fr)
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FR2915156B1 (en
Inventor
Annabelle Dumas
Eric Dervout
Jerome Meziere
Philippe Bertot
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Faurecia Interieur Industrie SAS
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Faurecia Interieur Industrie SAS
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Priority to FR0754514A priority Critical patent/FR2915156B1/en
Publication of FR2915156A1 publication Critical patent/FR2915156A1/en
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Publication of FR2915156B1 publication Critical patent/FR2915156B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B26D7/018—Holding the work by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4481—Cutters therefor; Dies therefor having special lateral or edge outlines or special surface shapes, e.g. apertures

Abstract

The skin (16) has a weakened portion defined by a weakened line (20) that is formed by a notch (22) arranged in the skin, on a side (24) opposite to an outer surface of a covering element i.e. fascia, of a motor vehicle, where the skin is made of leather. The notch has depth that varies along the weakened line, and variation amplitude (A) of the depth of the notch is 0.40 millimeter. The portion forms a deployment flap of an inflatable airbag. An independent claim is also included for a method for weakening a covering skin.

Description

Peau d'habillage pour véhicule automobile, dispositif et procédé deSkin for motor vehicle, device and method for

fragilisation d'une telle peau. La présente invention concerne une peau d'habillage destinée à recouvrir un élément d'habillage d'un véhicule automobile, du type comportant une portion fragilisée délimitée par une ligne affaiblie formée par une entaille ménagée dans la peau, sur le côté en regard dudit élément. On connaît, par exemple d'après le document US 6 224 090 B1, une peau d'habillage du type décrit précédemment, dans laquelle la ligne affaiblie a, en vue en plan, un profil non rectiligne.  weakening of such a skin. The present invention relates to a covering skin intended to cover a trim element of a motor vehicle, of the type comprising a weakened portion delimited by a weakened line formed by a notch formed in the skin, on the opposite side of said element. . US Pat. No. 6,224,090 B1, for example, discloses a skin of the type described above, in which the weakened line has, in plan view, a non-rectilinear profile.

Cependant, malgré son profil accidenté, cette ligne affaiblie, qui est usinée au la- ser, est visible par un passager du véhicule. L'invention a pour but d'améliorer l'esthétique de la peau d'habillage, en limitant la visibilité de la ligne affaiblie. A cet effet, l'invention a pour objet une peau d'habillage du type précité, caracté- risée en ce que l'entaille possède une profondeur qui varie le long de la ligne affaiblie. La peau d'habillage selon l'invention peut comporter une ou plusieurs des carac-téristiques suivantes : - le fond de l'entaille a, en coupe le long de l'entaille, un profil longitudinal curviligne ; - l'amplitude de variation de la profondeur de l'entaille est comprise entre 0,3 mm et 0,5 mm, de préférence sensiblement égale à 0,40 mm ; - hors de la ligne affaiblie, la peau présente une épaisseur maximale comprise entre 1,1 mm et 1,3 mm, de préférence sensiblement égale à 1,2 mm, et sur la ligne affaiblie, au niveau de la profondeur maximale de l'entaille, la peau présente une épais- seur minimale comprise entre 0,03 mm et 0,07 mm, de préférence sensiblement égale à 0,05 mm; - la ligne affaiblie a, en vue en plan, un profil ondulé et est notamment sensible-ment en forme générale de U, de I ou de H ; et - la peau est réalisée en cuir et destinée à recouvrir une planche de bord de vé- hicule automobile, la portion fragilisée formant une trappe de déploiement d'un coussin gonflable de sécurité. L'invention a également pour objet un véhicule automobile, du type comportant une planche de bord présentant une surface extérieure et un coussin gonflable de sécurité logé sous la planche de bord, caractérisé en ce qu'il comprend une peau d'habillage telle que décrite précédemment recouvrant ladite surface, la portion fragilisée étant dis-posée en regard dudit coussin. L'invention a en outre pour objet un dispositif de fragilisation d'une peau d'habillage telle que définie ci-dessus, du type comportant : - une enclume munie de moyens de retenue, notamment d'aspiration, pour main-tenir la peau en position sur l'enclume ; et - une lame coupante destinée à réaliser l'entaille, caractérisé en ce qu'il comprend des moyens de butée franche pour ajuster la profondeur maximale de l'entaille, la lame présentant un profil muni d'une denture, la denture comportant une pluralité de dents curvilignes agencées le long du profil. Le dispositif de fragilisation selon l'invention peut comprendre la caractéristique selon laquelle la lame a, en vue en plan, un profil ondulé et est notamment sensible-ment en forme générale de U, de 1 ou de H. L'invention a également pour objet un procédé de fragilisation d'une peau d'habillage telle que décrite précédemment, utilisant un dispositif de fragilisation tel que défini ci-dessus, caractérisé en ce qu'il comprend les étapes successives suivantes : - placer la peau du côté destiné à être visible par un utilisateur sur l'enclume ; - activer les moyens de retenue pour maintenir la peau en position sur l'enclume ; appliquer la lame coupante sur la peau du côté opposé audit côté visible ; - dégager la lame de la peau ; et - désactiver les moyens de retenue pour récupérer la peau. Le procédé de fragilisation selon l'invention peut comporter la caractéristique selon laquelle, lors de l'étape d'application de la lame sur la peau, l'effort d'affaiblissement exercé sur la peau est compris entre 40 daN et 60 daN, de préférence sensiblement égal à 50 daN, et la durée d'application dudit effort est inférieure à 4s, de préférence sensiblement égale à 3s. L'invention sera mieux comprise à la lecture de la description qui va suivre, don-née uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur les-30 quels : - la Figure 1 est une vue en perspective de l'intérieur d'un véhicule automobile équipé d'une peau d'habillage selon l'invention ; - la Figure 2 est une vue en coupe sensiblement suivant la ligne II-II de la Figure - la Figure 3 est une vue en coupe horizontale d'une lame d'un dispositif de fragilisation selon l'invention ; - la Figure 4 est une vue en coupe verticale suivant la ligne IV-IV de la Figure 3 ; - la Figure 5 est une vue en coupe verticale illustrant schématiquement un dispo- sitif de fragilisation selon l'invention avant la descente de la lame ; et - la Figure 6 est une vue analogue à celle de la Figure 5 représentant le dispositif après la descente de la lame. La Figure 1 représente, de façon simplifiée, une planche de bord 10 d'un véhicule automobile 12.  However, despite its uneven profile, this weakened line, which is machined by laser, is visible to a passenger of the vehicle. The invention aims to improve the aesthetics of skin dressing, limiting the visibility of the line weakened. To this end, the subject of the invention is a covering skin of the aforementioned type, characterized in that the notch has a depth which varies along the weakened line. The covering skin according to the invention may comprise one or more of the following characteristics: the bottom of the notch has, in section along the notch, a curvilinear longitudinal profile; the amplitude of variation of the depth of the notch is between 0.3 mm and 0.5 mm, preferably substantially equal to 0.40 mm; - outside the weakened line, the skin has a maximum thickness of between 1.1 mm and 1.3 mm, preferably substantially equal to 1.2 mm, and on the weakened line, at the level of the maximum depth of the the notch, the skin has a minimum thickness of between 0.03 mm and 0.07 mm, preferably substantially equal to 0.05 mm; the weakened line has, in plan view, a corrugated profile and is notably substantially in the general shape of U, I or H; and the skin is made of leather and intended to cover a dashboard of a motor vehicle, the weakened portion forming a deployment hatch of an airbag. The invention also relates to a motor vehicle, of the type comprising a dashboard having an outer surface and an air bag secured below the dashboard, characterized in that it comprises a trim skin as described previously covering said surface, the weakened portion being placed opposite said cushion. The subject of the invention is furthermore a device for weakening a covering skin as defined above, of the type comprising: an anvil provided with retaining means, in particular suction means, for holding the skin in position on the anvil; and a cutting blade intended to produce the notch, characterized in that it comprises stop means for adjusting the maximum depth of the notch, the blade having a profile provided with a toothing, the toothing comprising a plurality curvilinear teeth arranged along the profile. The embrittlement device according to the invention may comprise the characteristic according to which the blade has, in plan view, a corrugated profile and is particularly substantially in the general shape of U, 1 or H. The invention also object a method of weakening a skin dressing as described above, using a weakening device as defined above, characterized in that it comprises the following successive steps: - place the skin on the side to be visible by a user on the anvil; - activate the retaining means to maintain the skin in position on the anvil; apply the cutting blade to the skin on the opposite side to said visible side; - clear the blade of the skin; and - deactivating the retaining means to recover the skin. The embrittlement process according to the invention may comprise the characteristic according to which, during the step of applying the blade to the skin, the weakening force exerted on the skin is between 40 daN and 60 daN, preferably substantially equal to 50 daN, and the duration of application of said force is less than 4s, preferably substantially equal to 3s. The invention will be better understood on reading the description which will follow, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a perspective view of the interior of a motor vehicle equipped with a covering skin according to the invention; - Figure 2 is a sectional view substantially along the line II-II of the Figure - Figure 3 is a horizontal sectional view of a blade of an embrittlement device according to the invention; - Figure 4 is a vertical sectional view along the line IV-IV of Figure 3; - Figure 5 is a vertical sectional view schematically illustrating an embrittlement device according to the invention before the descent of the blade; and - Figure 6 is a view similar to that of Figure 5 showing the device after the descent of the blade. Figure 1 shows, in a simplified manner, a dashboard 10 of a motor vehicle 12.

La planche de bord 10 présente une surface extérieure 14 recouverte par une peau d'habillage 16 en cuir, ainsi qu'un coussin gonflable de sécurité 17 logé sous la planche de bord 10, du côté passager. La peau 16 comporte une portion fragilisée 18 disposée en regard du coussin 17 et formant une trappe de déploiement de celui-ci lors d'un choc subi par le véhicule 12.  The dashboard 10 has an outer surface 14 covered by a leather skin 16, and an airbag 17 housed under the dashboard 10, the passenger side. The skin 16 has a weakened portion 18 disposed opposite the cushion 17 and forming a hatch of deployment thereof during a shock to the vehicle 12.

La portion fragilisée 18 est délimitée par une ligne affaiblie 20 qui a, en vue en plan, un profil ondulé formant des vaguelettes et qui est sensiblement en forme générale de U. Comme on le voit mieux sur la Figure 2, la ligne affaiblie 20 est formée par une entaille 22 ménagée dans la peau 16, sur le côté 24 de la peau 16 en regard de la sur- face extérieure 14 de la planche de bord 10, c'est-à-dire sur le côté envers de la peau 16 lorsque celle-ci est placée sur la planche de bord 10. L'entaille 22 possède une profondeur P qui varie le long de la ligne affaiblie 20. En effet, le fond 26 de l'entaille 22 a, en coupe le long de l'entaille 22, un profil longitudinal curviligne formant des bosses, sensiblement épicycloïdal dans cet exemple.  The weakened portion 18 is delimited by a weakened line 20 which, in plan view, has a wavy wave-shaped profile and is substantially U-shaped. As best seen in FIG. 2, the weakened line 20 is formed by a notch 22 formed in the skin 16, on the side 24 of the skin 16 facing the outer surface 14 of the dashboard 10, that is to say on the reverse side of the skin 16 when it is placed on the dashboard 10. The notch 22 has a depth P which varies along the weakened line 20. Indeed, the bottom 26 of the notch 22 has, in section along the line notch 22, a curvilinear longitudinal profile forming bumps substantially epicyclic in this example.

Ainsi, le profil du fond 26 forme une succession de bosses 27A sensiblement semi-elliptiques, séparées par des points de rebroussement 27B. L'amplitude A de variation de la profondeur P de l'entaille 22, c'est-à-dire la différence entre la profondeur maximale Pmax et la profondeur minimale Pm;n de l'entaille 22, est comprise entre 0,3 mm et 0,5 mm.  Thus, the bottom profile 26 forms a succession of substantially semi-elliptical bumps 27A, separated by cusps 27B. The amplitude A of variation of the depth P of the notch 22, that is to say the difference between the maximum depth Pmax and the minimum depth Pm; n of the notch 22, is between 0.3 mm. and 0.5 mm.

Hors de la ligne affaiblie 20, la peau 16 présente une épaisseur maximale Emax comprise entre 1,1 mm et 1,3 mm. Sur la ligne affaiblie 20, au niveau de la profondeur maximale Pmax de l'entaille 22, la peau 16 présente une épaisseur minimale Emin comprise entre 0,03 mm et 0,07 mm.  Outside the weakened line 20, the skin 16 has a maximum thickness Emax of between 1.1 mm and 1.3 mm. On the weakened line 20, at the maximum depth Pmax of the notch 22, the skin 16 has a minimum thickness Emin of between 0.03 mm and 0.07 mm.

Dans l'exemple considéré, on a sensiblement A = 0,40 mm, Emax = 1,2 mm et Emin = 0,05 mm. La Figure 3 illustre une lame coupante 28 destinée à réaliser l'entaille 22, fabriquée à partir d'acier à haute résistance et obtenue par usinage.  In the example, there is substantially A = 0.40 mm, Emax = 1.2 mm and Emin = 0.05 mm. Figure 3 illustrates a cutting blade 28 for making the notch 22, made from high strength steel and obtained by machining.

La lame 28 a, en vue en plan, un profil 30 ondulé formant des vaguelettes et est sensiblement en forme générale de U. La lame 28 est fixée par tout moyen approprié à un support rigide supérieur 31. En référence à la Figure 4, la lame 28 est munie d'une denture 32 venue de matière avec la lame 28 et qui comporte une pluralité de dents 34 curvilignes agencées le long du profil 30 et dont la forme est complémentaire de celle des bosses 27A décrites plus haut. Les dents 34 présentent deux faces 35A, 35B ayant des angles d'inclinaison a et g différents l'un de l'autre. Dans l'exemple considéré, on a sensiblement a = 15 et g. = 22 .  The blade 28 has, in plan view, a corrugated wave-like profile and is substantially U-shaped. The blade 28 is secured by any suitable means to an upper rigid support 31. Referring to FIG. blade 28 is provided with a toothing 32 integral with the blade 28 and which has a plurality of curvilinear teeth 34 arranged along the profile 30 and whose shape is complementary to that of the bumps 27A described above. The teeth 34 have two faces 35A, 35B having angles of inclination a and g different from each other. In the example considered, there is substantially a = 15 and g. = 22.

La Figure 5 représente un dispositif de fragilisation 36 destiné à réaliser la peau 16. Le dispositif 36 comporte une enclume 38, la lame 28 ainsi que des moyens de butée franche 40. L'enclume 38 présente une surface supérieure plane 41 destinée à recevoir la peau 16, et est munie de moyens de retenue 42, qui sont dans l'exemple considéré des moyens d'aspiration, propres à maintenir la peau 16 en position sur l'enclume 38. La lame 28 est montée mobile en translation verticale au-dessus de l'enclume 38. Les moyens de butée franche 40 comprennent une butée rigide 44 fixe par rap- port à l'enclume 38, et le support rigide 31 de la lame 28. Les moyens de butée franche 40 permettent de régler un entrefer entre la pointe des dents 34 de la lame 28 et la surface supérieure 41 de l'enclume 38, et donc d'ajuster la profondeur maximale Pmax de l'entaille 22. La hauteur de l'entrefer correspond ainsi à l'épaisseur minimale Emin de la peau 16. Le procédé de fragilisation de la peau 16, c'est-à-dire le fonctionnement du dis-positif 36, va maintenant être décrit en référence aux Figures 5 et 6. La lame 28 étant éloignée de l'enclume 38, la face visible de la peau 16 est posée sur la surface supérieure 41 de l'enclume 38.  5 represents an embrittlement device 36 intended to produce the skin 16. The device 36 comprises an anvil 38, the blade 28 as well as open stop means 40. The anvil 38 has a flat upper surface 41 intended to receive the skin 16, and is provided with retaining means 42, which are in the example considered suction means, adapted to maintain the skin 16 in position on the anvil 38. The blade 28 is mounted movably in vertical translation to- The abutment means 40 comprise a rigid abutment 44 fixed with respect to the anvil 38, and the rigid support 31 of the blade 28. The abutment means 40 make it possible to adjust a gap between the tip of the teeth 34 of the blade 28 and the upper surface 41 of the anvil 38, and therefore to adjust the maximum depth Pmax of the notch 22. The height of the air gap thus corresponds to the minimum thickness Emin 16. The process of embrittlement of the skin 16, that is to say the operation of the dis-positive 36, will now be described with reference to Figures 5 and 6. The blade 28 being away from the anvil 38, the visible face of the skin 16 is placed on the upper surface 41 of the anvil 38.

Les moyens d'aspiration 42 sont activés et la peau 16 est ainsi maintenue en po-sition. Un effort d'affaiblissement est alors exercé sur la lame 28 qui vient s'appliquer, dans la direction de la flèche F (Figure 6), sur le côté envers 24 de la peau 16.  The suction means 42 are activated and the skin 16 is thus maintained in position. A weakening force is then exerted on the blade 28 which is applied in the direction of the arrow F (Figure 6) on the back side 24 of the skin 16.

La descente de la lame est limitée par les moyens de butée franche 40, le support 31 venant en contact direct et butant contre la butée 44. L'effort exercé est compris entre 40 daN et 60 daN, et la durée d'application de cet effort est inférieure à 4s. Dans l'exemple considéré, on a sensiblement un effort de 50 daN pendant 3s.  The descent of the blade is limited by the stop means 40, the support 31 coming into direct contact and abutting against the stop 44. The force exerted is between 40 daN and 60 daN, and the duration of application of this effort is less than 4s. In the example considered, there is substantially a force of 50 daN for 3s.

Passé ce délai, la lame 28 est dégagée de la peau 16, puis les moyens d'aspiration sont désactivés pour récupérer la peau 16. La peau d'habillage selon l'invention, obtenue à l'aide du dispositif et du procédé de fragilisation selon l'invention, permet de recouvrir de façon esthétique une planche de bord de véhicule automobile en masquant la trappe de déploiement d'un coussin gonflable de sécurité. En variante, la peau 16 est réalisée à partir d'un matériau quelconque approprié autre que le cuir. En variante également, la ligne affaiblie 20 a, en vue en plan, un profil non ondulé et/ou est sensiblement en forme générale de I ou de H.  After this time, the blade 28 is disengaged from the skin 16, then the suction means are deactivated to recover the skin 16. The skin of the invention according to the invention, obtained using the device and the embrittlement process according to the invention makes it possible to aesthetically cover a dashboard of a motor vehicle by hiding the deployment hatch of an airbag. Alternatively, the skin 16 is made from any suitable material other than leather. In a variant also, the weakened line 20 has, in plan view, a non-corrugated profile and / or is substantially in the general shape of I or H.

Dans une autre variante encore, le dispositif 36 comporte des moyens pour chauffer la lame 28 avant de l'appliquer sur la peau 16. Dans une autre variante également, on graine par micro-billage l'enclume 38, par exemple avec des billes d'inox de 5/10 mm projetées sur la surface 41, pour atténuer le repassage du grainage de la peau 16 du côté visible.  In yet another variant, the device 36 comprises means for heating the blade 28 before applying it to the skin 16. In another variant also, the anvil 38 is micro-blasted by, for example, diamond balls. 5/10 mm stainless steel projected on the surface 41, to reduce the ironing graining of the skin 16 on the visible side.

Un deuxième mode de réalisation de l'invention consiste à avoir une lame 28 discontinue avec une pluralité de dents 34 espacées les unes des autres le long du pro-fil 30.  A second embodiment of the invention is to have a discontinuous blade 28 with a plurality of teeth 34 spaced from each other along the pro-wire 30.

Claims (11)

REVENDICATIONS 1.- Peau d'habillage (16) destinée à recouvrir un élément d'habillage (10) d'un véhicule automobile (12), du type comportant une portion fragilisée (18) délimitée par une ligne affaiblie (20) formée par une entaille (22) ménagée dans la peau (16), sur le côté (24) en regard dudit élément (10), caractérisée en ce que l'entaille (22) possède une profondeur (P) qui varie le long de ligne affaiblie (20).  1.- covering skin (16) intended to cover a covering element (10) of a motor vehicle (12), of the type comprising a weakened portion (18) delimited by a weakened line (20) formed by a notch (22) formed in the skin (16), on the side (24) facing said element (10), characterized in that the notch (22) has a depth (P) which varies along the weakened line ( 20). 2.- Peau d'habillage (16) selon la revendication 1, caractérisée en ce que le fond (26) de l'entaille (22) a, en coupe le long de l'entaille (22), un profil longitudinal curvili- gne.  2. Skin covering (16) according to claim 1, characterized in that the bottom (26) of the notch (22) has, in section along the notch (22), a longitudinal profile curvili- Reign. 3.- Peau d'habillage (16) selon la revendication 1 ou 2, caractérisée en ce que l'amplitude (A) de variation de la profondeur (P) de l'entaille (22) est comprise entre 0,3 mm et 0,5 mm, de préférence sensiblement égale à 0,40 mm.  3. Skin covering (16) according to claim 1 or 2, characterized in that the amplitude (A) of variation of the depth (P) of the notch (22) is between 0.3 mm and 0.5 mm, preferably substantially equal to 0.40 mm. 4.- Peau d'habillage (16) selon l'une quelconque des revendications 1 à 3, carac- térisée en ce que, hors de la ligne affaiblie (20), la peau (16) présente une épaisseur maximale (Emax) comprise entre 1,1 mm et 1,3 mm, de préférence sensiblement égale à 1,2 mm, et sur la ligne affaiblie (20), au niveau de la profondeur maximale (Pmax) de l'entaille (22), la peau (16) présente une épaisseur minimale (Emin) comprise entre 0,03 mm et 0,07 mm, de préférence sensiblement égale à 0, 05 mm.  4. Skin covering (16) according to any one of claims 1 to 3, characterized in that, outside the weakened line (20), the skin (16) has a maximum thickness (Emax) included between 1.1 mm and 1.3 mm, preferably substantially equal to 1.2 mm, and on the weakened line (20), at the level of the maximum depth (Pmax) of the notch (22), the skin ( 16) has a minimum thickness (Emin) of between 0.03 mm and 0.07 mm, preferably substantially equal to 0.05 mm. 5.- Peau d'habillage (16) selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la ligne affaiblie (20) a, en vue en plan, un profil ondulé et est notamment sensiblement en forme générale de U, de I ou de H.  5. Skin covering (16) according to any one of claims 1 to 4, characterized in that the weakened line (20) has, in plan view, a corrugated profile and is in particular substantially U-shaped general , I or H. 6.- Peau d'habillage (16) selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la peau (16) est réalisée en cuir et destinée à recouvrir une planche de bord (10) de véhicule automobile (12), la portion fragilisée (18) formant une trappe de déploiement d'un coussin gonflable de sécurité (17).  6. Skin covering (16) according to any one of claims 1 to 5, characterized in that the skin (16) is made of leather and intended to cover a dashboard (10) of a motor vehicle (12). ), the weakened portion (18) forming a deployment hatch of an airbag (17). 7.- Véhicule automobile (12), du type comportant une planche de bord (10) pré-sentant une surface extérieure (14) et un coussin gonflable de sécurité (17) logé sous la planche de bord (10), caractérisé en ce qu'il comprend une peau d'habillage (16) selon l'une quelconque des revendications précédentes recouvrant ladite surface (14), la portion fragilisée (18) étant disposée en regard dudit coussin (17).  7. A motor vehicle (12), of the type comprising a dashboard (10) having an outer surface (14) and an airbag (17) located under the dashboard (10), characterized in that it comprises a skin dressing (16) according to any one of the preceding claims covering said surface (14), the weakened portion (18) being disposed opposite said cushion (17). 8.- Dispositif de fragilisation (36) d'une peau d'habillage (16) selon l'une quel-conque des revendications 1 à 6, du type comportant : - une enclume (38) munie de moyens de retenue (42), notamment d'aspiration, pour maintenir la peau (16) en position sur l'enclume (38) ; et- une lame coupante (28) destinée à réaliser l'entaille (22), caractérisé en ce qu'il comprend des moyens de butée franche (40) pour ajuster la profondeur maximale (P,max) de l'entaille (22), la lame (28) présentant un profil (30) muni d'une denture (32), la denture (32) comportant une pluralité de dents (34) curvili- gnes agencées le long du profil (30).  8.- embrittlement device (36) of a covering skin (16) according to any one of claims 1 to 6, of the type comprising: - an anvil (38) provided with retaining means (42) , in particular suction, for holding the skin (16) in position on the anvil (38); and- a cutting blade (28) for making the notch (22), characterized in that it comprises stop means (40) for adjusting the maximum depth (P, max) of the notch (22) the blade (28) having a profile (30) provided with a toothing (32), the toothing (32) having a plurality of curvilinear teeth (34) arranged along the profile (30). 9.- Dispositif de fragilisation (36) selon la revendication 8, caractérisé en ce que la lame (28) a, en vue en plan, un profil (30) ondulé et est notamment sensiblement en forme générale de U, de I ou de H.  9.- weakening device (36) according to claim 8, characterized in that the blade (28) has, in plan view, a profile (30) corrugated and is particularly substantially in the general shape of U, I or H. 10.- Procédé de fragilisation d'une peau d'habillage (16) selon l'une quelconque des revendications 1 à 6, utilisant un dispositif de fragilisation (36) selon la revendication 8 ou 9, caractérisé en ce qu'il comprend les étapes successives suivantes : - placer la peau (16) du côté destiné à être visible par un utilisateur sur l'enclume (38) ; - activer les moyens de retenue (42) pour maintenir la peau (16) en position sur 15 l'enclume (38) ; - appliquer la lame coupante (28) sur la peau (16) du côté (24) opposé audit côté visible ; - dégager la lame (28) de la peau (16) ; et - désactiver les moyens de retenue (42) pour récupérer la peau (16). 20  10. A method of weakening a skin dressing (16) according to any one of claims 1 to 6, using an embrittlement device (36) according to claim 8 or 9, characterized in that it comprises the following successive steps: - placing the skin (16) on the side intended to be visible by a user on the anvil (38); activating the retaining means (42) to hold the skin (16) in position on the anvil (38); - Apply the cutting blade (28) on the skin (16) of the side (24) opposite to said visible side; - Release the blade (28) of the skin (16); and - deactivating the retaining means (42) to recover the skin (16). 20 11.- Procédé de fragilisation selon la revendication 10, caractérisé en ce que, lors de l'étape d'application de la lame (28) sur la peau (16), l'effort d'affaiblissement exercé sur la peau (16) est compris entre 40 daN et 60 daN, de préférence sensible-ment égal à 50 daN, et la durée d'application dudit effort est inférieure à 4s, de préférence sensiblement égale à 3s.  11.- embrittlement process according to claim 10, characterized in that, during the step of applying the blade (28) on the skin (16), the weakening force exerted on the skin (16) is between 40 daN and 60 daN, preferably substantially equal to 50 daN, and the duration of application of said effort is less than 4s, preferably substantially equal to 3s.
FR0754514A 2007-04-17 2007-04-17 CARRIER SKIN FOR A MOTOR VEHICLE, DEVICE AND METHOD FOR FRAGILIZATION OF SUCH A SKIN. Expired - Fee Related FR2915156B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014081426A1 (en) * 2012-11-21 2014-05-30 Faurecia Interior Systems, Inc. Vehicle interior panel with airbag tear seam formed by mechanical piercing
FR2998823A1 (en) * 2012-11-30 2014-06-06 Oberthur Technologies Device for cutting test band utilized for support card of e.g. smart card, has support unit ready to support test band against blade, and adjustment unit to regulate play of test band with regard to blade so as to regulate depth of notch

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE19937373A1 (en) * 1999-08-07 2001-02-22 Daimler Chrysler Ag Internal upholstery for vehicle with airbag equipment, mainly made of foil, weakened in which airbag is built in to form tear seam in zigzag or meandering line
DE10055546A1 (en) * 2000-03-10 2001-09-27 Aradex Ag Method for producing weakened structures along a designed break line in an airbag cover involves use of a stamping tool to produce cutouts on the inner side of the cover material
DE10129618A1 (en) * 2001-06-20 2003-01-09 Jenoptik Automatisierungstech Air bag cover sheet has line of weakness made up of non-intersecting, curved slots which also have curved cross-section, seen through thickness of sheet
EP1623883A1 (en) * 2004-08-05 2006-02-08 Eissmann Automotive Deutschland GmbH Cover for an airbag housing
WO2006111212A1 (en) * 2005-04-20 2006-10-26 Eissmann Automotive Deutschland Gmbh Cover for an airbag and method for the production thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937373A1 (en) * 1999-08-07 2001-02-22 Daimler Chrysler Ag Internal upholstery for vehicle with airbag equipment, mainly made of foil, weakened in which airbag is built in to form tear seam in zigzag or meandering line
DE10055546A1 (en) * 2000-03-10 2001-09-27 Aradex Ag Method for producing weakened structures along a designed break line in an airbag cover involves use of a stamping tool to produce cutouts on the inner side of the cover material
DE10129618A1 (en) * 2001-06-20 2003-01-09 Jenoptik Automatisierungstech Air bag cover sheet has line of weakness made up of non-intersecting, curved slots which also have curved cross-section, seen through thickness of sheet
EP1623883A1 (en) * 2004-08-05 2006-02-08 Eissmann Automotive Deutschland GmbH Cover for an airbag housing
WO2006111212A1 (en) * 2005-04-20 2006-10-26 Eissmann Automotive Deutschland Gmbh Cover for an airbag and method for the production thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014081426A1 (en) * 2012-11-21 2014-05-30 Faurecia Interior Systems, Inc. Vehicle interior panel with airbag tear seam formed by mechanical piercing
US9421938B2 (en) 2012-11-21 2016-08-23 Faurecia Interior Systems, Inc. Vehicle interior panel with airbag tear seam formed by mechanical piercing
FR2998823A1 (en) * 2012-11-30 2014-06-06 Oberthur Technologies Device for cutting test band utilized for support card of e.g. smart card, has support unit ready to support test band against blade, and adjustment unit to regulate play of test band with regard to blade so as to regulate depth of notch

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