DE102014112205A1 - Method for providing a cover for an airbag - Google Patents

Abstract

The invention relates to a method for providing a cover (2) for an airbag, which is to be arranged in a housing to be covered by a cover which is to be arranged in an opening of a motor vehicle, wherein the cover by a lid edge having a contour , is bounded, wherein the cover (2) is formed of sheet material having a front side and a rear side, wherein on the back of an auxiliary line (10) is provided which is at least partially congruent with the contour of the lid edge, wherein a Auxiliary line (10) on both sides enclosing corridor (12) is provided, wherein on the back of the sheet material within the corridor (12) with an at least partially bent blade of a pendulum blade in the sheet material a plurality of weakening lines (30a, 30b, 30c, 30d, 30e , 30f) which intersect the auxiliary line (10) at an angle, are cut, with a maximum penetration depth of the blade of the pendulum blade is chosen in a body of sheet material less than a thickness of the body.

Description

The invention relates to a method for providing a cover for an airbag, a device for providing a cover for an airbag and a cover for an airbag.

In an instrument panel or a dashboard of a motor vehicle, an airbag may be arranged for occupant protection in the event of an accident. In this case, the airbag is usually arranged in a housing, which in turn is arranged in the instrument panel and covered with a lid. The lid is arranged in an outer wall of the instrument panel.

One from the publication DE 10 2011 078 789 B4 A known component for a vehicle with an airbag comprises a carrier and a decorative layer arranged above the carrier with a rear side facing the carrier, in which a weakening is provided for forming a desired tear line for the airbag. In this case, the weakening is formed by a plurality of mutually separate, linear individual weakenings, which extend over more than half of the surface of the decorative layer and are formed in at least two groups, wherein the longitudinal orientation of the individual weakenings of a first group and the longitudinal orientation of the individual weakenings of a second group differ.

A film with a predetermined breaking line for an airbag cover and a method and apparatus for introducing such a predetermined breaking line in the film are in the document DE 101 29 618 A1 described. The fracture line is generated by mechanical weaknesses by peeling holes out of the film. For this purpose, in particular a suitable paring knife is described, the geometry of which determines a shape of the holes.

The publication DE 10 2005 016 262 B4 describes a composite sheet having a base sheet material split therein in an elongated separation area and a bonding sheet material bonded to the base sheet material that spans a parting line extending in the separation area and dividing the base sheet into itself. The connecting sheet material has lines of weakness as punches or slits, wherein at least a part of the weakening lines crosses the dividing line.

A cover for an airbag module is from the document WO 2014/062259 A1 known and includes a tear seam along which the cover can rupture upon activation of the airbag module. In this case, the tear seam on a plurality of cuts, which can be arranged to each other V-shaped or zigzag.

A method for producing a vehicle seat with an integrated therein airbag module is from the document DE 10 2007 061 848 A1 known. In this case, a reference along an opening line, along which a tearing of the cover upon release of the airbag module and a leakage of an unfolding airbag of the airbag module are provided, weakened. The airbag module and a padding of the vehicle seat are blinded by the reference, wherein the reference is weakened by means of ultraviolet laser radiation.

Against this background, it was an object of the invention to incorporate a predetermined breaking range into a cover for an airbag with little effort.

To achieve the object, a method, a device and a cover with the features of the independent claims are presented. Embodiments of the method, the device and the cover are evident from the dependent claims and the description.

The method is configured to provide a cover for an airbag. This airbag is to be arranged in a housing which is to be covered by a cover which is to be arranged in an opening of a wall of an interior trim part, for example of a dashboard or an instrument panel, of a motor vehicle. The lid is bordered by a lid edge having a contour. The cover is formed from flat, elastically deformable material as a starting product, which has a front side and a rear side. On the back of a visible or invisible auxiliary line is provided or taken into account, which is at least partially congruent with the contour of the lid edge. In addition, a corridor enclosing the auxiliary line is provided, wherein on and / or in the rear side of the sheet material within the corridor with an at least partially curved blade of a pendulum blade into a body of the sheet material, a plurality of lines of weakness intersecting the auxiliary line at an angle, get cut. In this case, a maximum penetration depth of the blade of the pendulum blade is selected in the body of the sheet material is less than a thickness of the body.

The auxiliary line on the back is usually formed mirror-inverted to the contour of the lid edge in the wall of the interior trim part. The auxiliary line to be provided or to be considered is to be applied in a visible manner on the rear side. Alternatively, the guide is virtual provided. In both cases, the auxiliary line in a positioning of the pendulum blade relative to the body, for example. By a computing unit, which is designed to control the method and components of the device according to the invention to take into account.

Furthermore, the auxiliary line is provided as a copy or an image of the contour of the lid edge and serves in providing the cover as an orientation aid for possible points or positions at which lines of weakness are to be cut into the body of the sheet material. By using the auxiliary line, it follows that the lines of weakness cut along the auxiliary line in the body are also arranged along at least a portion of the contour of the lid rim as soon as the cover or the material provided with the weakening lines is arranged and / or fastened on the wall of the inner lining valve is.

The maximum depth of penetration of the blade of the pendulum blade in the body corresponds to a maximum of 2/3 of the thickness of the body. Depending on the thickness and nature, for example hardness and / or toughness, the penetration depth can be selected from the sheet material and is, for example, 50% to 60% of the thickness of the body.

On and / or in the back of the body, at least a first set of a plurality of mutually parallel weakening lines are cut, which intersect or intersect the auxiliary line at an acute angle of, for example, 45 °. In addition, a plurality of intersecting at a respective angle lines of weakness are cut on the back. Thus it is possible to cut on the back at least two lines of weakness that intersect on the auxiliary line. In an embodiment, at least two weakening lines are to be cut in and / or on the back side, which intersect at an angle of, for example, 90 °. Usually, at least a second set of several mutually parallel weakening lines is cut onto or into the rear side, wherein the weakening lines of the at least one second set of weakening lines intersect or cut those weakening lines of the at least one first set of weakening lines.

In addition, it is provided that distances from mutually parallel, directly adjacent weakening lines are varied. In this regard, at least one central point is defined on the guide. In and / or on the back of two mutually parallel, immediately adjacent and point-like lines of weakness are cut, which have a minimum distance to each other, these two lines of weakness have a minimum distance from all mutually parallel lines of weakness to the at least one central point. More parallel to each other, immediately adjacent lines of weakness, which have greater distances to the at least one central point than the two near-point lines of weakness, each have a distance which is greater than the minimum distance between the two near-point lines of weakness. The distance between two immediately adjacent lines of weakness is chosen the greater, the farther these two lines of weakness are from the at least one central point on the auxiliary line.

In a further step, the flat material provided on the back and / or in the back with the weakening lines is arranged with the back side ahead on the wall of the interior trim part, wherein the auxiliary line is congruently positioned to the contour.

The inventive device comprises a pendulum blade with an at least partially curved or curved blade and is designed to provide a cover for an airbag. In this case, the airbag is to be arranged in a housing which is to be covered by a cover which is to be arranged in an opening in a wall of an interior trim part in an interior of a motor vehicle, the cover being bounded or delimited by a cover edge having a contour. The cover is formed from flat, elastically deformable material as the starting product, which has a front side and a rear side, wherein an auxiliary line is to be provided and / or taken into account on the rear side, which is at least partially congruent with the contour of the cover edge. In addition, a corridor surrounding the auxiliary line should be provided, wherein the pendulum knife is designed to cut a plurality of lines of weakness that intersect the auxiliary line at an angle on and / or in the rear side of the sheet material within the corridor. In this case, a penetration depth of the blade of the pendulum blade into a body of the sheet material is less than a thickness of the body to choose.

In an embodiment, the blade of the pendulum blade is bent convex and, for example, circular arc-shaped.

The blade is connected via a rod to a suspension point of the device and to pivot relative to and / or about the suspension point along a circular path.

The auxiliary line to be provided on the back serves, among other things, for orientation for positioning the pendulum blade when cutting the lines of weakness. As a rule, the suspension point is the Device to be arranged vertically above the auxiliary line and to move from point to point at which at least one line of weakness, usually a line of weakness or two lines of weakness, is to be cut along the auxiliary line and thus to position. It is possible to apply the auxiliary line on the back and / or draw. In an embodiment, the device for providing the cover by the arithmetic unit, which is also designed as a component of the device to control, and thus to control and / or to regulate. In this case, it is not necessary to draw the auxiliary line to be provided on the back, since its course is stored in the arithmetic unit and taken into account when the cover is provided.

The cover according to the invention is intended for an airbag which is to be arranged in a housing which is to be covered by a cover which is to be arranged in an opening of a wall of an interior trim part, for example a dashboard or an instrument panel, of a motor vehicle. The lid is bounded by a lid edge having a contour. The cover is formed from flat, elastically deformable material as a starting product, which has a front side and a rear side. On the back of an auxiliary line, for example. Drawn and thus provided, which is at least partially congruent with the contour of the lid edge. In addition, a corridor surrounding the auxiliary line is provided on both sides. On the or in the back of the sheet material within the corridor with an at least partially bent blade of a pendulum blade in the sheet material several lines of weakness that intersect the auxiliary line each at an angle, cut, with a maximum penetration depth of the blade of the pendulum blade in a Body of the sheet material is chosen smaller than a thickness of the body.

Each weakening line has a longitudinal profile which is cut in a circular arc into the body of the material.

The material is elastically deformable and made of leather, for example. Natural leather or artificial leather.

The method is usually carried out in a saddlery, wherein in the cover formed of leather or a spacer fabric in the region of the airbag to be covered, a weakening is incorporated, which meets requirements for an opening behavior of the lid of the airbag.

The cover formed in the embodiment of leather or a dermis is weakened in the region of the lid of the airbag on the back by weakening lines, which are designed, for example, as cross-cuts. The cover is to be arranged on the example provided for a dashboard interior trim part, wherein the back is to be arranged directly on the wall of the interior trim part. In this case, the usually designed as a dashboard interior trim part is provided for an interior of a motor vehicle. The back side is invisible in contrast to the visible front side of the cover. In addition, the lines of weakness are not visible from the outside.

The sheet material from which the cover is to be formed is stretched on a surface of a planar base of the device and weakened by the pendulum blade along the previously defined corridor through the cut lines of weakness. In this case, a minimum distance is set between the blade of the pendulum blade and the surface of the flat pad, resulting in a difference of the thickness of the material and the minimum distance, the maximum penetration depth of the blade into the body of the sheet. The lines of weakness or cutting lines are machined with the pendulum blade at varying distances and in a 90 degree rotation with each other. Thus, at a point to be assigned to a center of the lid or a flap of the airbag, an initial weakening formed by the lines of weakness is introduced, wherein a distance of immediately adjacent mutually parallel lines of weakness starting from the defined central point, where their distance least is, the greater, the farther immediately adjacent lines of weakness are removed from the central point.

In an activation of the airbag caused by an impact of the motor vehicle, the cover is torn open in the area of the lines of weakness over the airbag and the cover, which emerge from the wall of the interior trim part for the interior of the motor vehicle.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination but also in other combinations or alone, without departing from the scope of the present invention.

The invention is schematically illustrated by embodiments in the drawings and will be described schematically and in detail with reference to the drawings.

1 shows a schematic representation of an embodiment of a cover according to the invention, which is provided by an embodiment of a method according to the invention.

2 shows a schematic representation of an embodiment of a device according to the invention, with the cover off 1 to provide in carrying out the method.

The figures are described coherently and comprehensively, wherein the same components are assigned the same reference numerals.

1 shows a rear side of the embodiment formed from sheet material of the cover according to the invention 2 in a schematic representation. 2 shows a schematic representation of a sectional view through a body 4 of the sheet material from which the cover 2 is to manufacture, as well as the embodiment of the device according to the invention 6 ,

The device 6 includes a flat surface 8th with a smooth surface on which the sheet material is arranged, usually clamped. In this case, a front side of the material touches the smooth surface, whereas a back of the sheet material from the smooth surface of the flat surface 8th turned away. In the presentation off 1 For a viewer is also the back of the sheet material and thus the cover to be provided 2 facing.

On the back here is a guide 10 provided and applied visible from the outside, for example. Drawn, whose course corresponds to a curve of a contour of a lid edge of a lid, which is adapted to cover a housing in which an airbag is to be arranged. The housing and the airbag are to be arranged in an interior trim part, for example in a dashboard, for an interior of a motor vehicle. The lid is to be arranged in an opening of the housing and a wall of the interior trim part, wherein the wall encloses the lid. The edge of the lid limits the lid.

In addition, a the auxiliary line 10 enclosing corridor 12 defined and thus provided, here in both 1 as well as in 2 one by first double arrows 14 indicated width of about 20 to 40 mm.

The device 6 includes next to the pad 8th a pendulum knife 16 with a circular arc-shaped blade 18 that have a bar 20 with a suspension point 22 connected is. Here is the blade 18 at a first end of the staff 20 attached. A second end of the staff 18 is at the suspension point 22 attached and about an axis passing through the suspension point 22 runs, rotatably mounted. Thus, the blade is 18 of the pendulum knife 16 that over the bar 20 with the suspension point 18 is connected, as in 2 by a curved double arrow 24 indicated to the suspension point 22 around along at least a portion of a circular path rotatable or pivotable.

The one on the pad 8th arranged bodies 4 the sheet material for providing the cover 2 here has a thickness or width of 1.2 mm, which in 2 through a second double arrow 26 is indicated. A distance between the surface of the pad 8th and the suspension point 22 is variably adjustable. Here it is envisaged that an outer edge of the blade 18 and the suspension point 22 that over the bar 20 connected to each other, have a constant distance from each other. One by a third double arrow 28 in 2 indicated penetration depth around the suspension point 22 swinging blade 18 of the pendulum knife 16 in the body 4 depends on a distance of the suspension point 22 to the surface of the pad 8th from and is here about 0.6 to 0.7 mm.

With a swinging movement of the blade 18 of the pendulum knife 16 penetrates this maximum to the intended depth of penetration into the body 4 of the sheet material, being in the body 4 at least one line of weakness 30 (in 2 shown in sectional view), 30a . 30b . 30c . 30d . 30e . 30f (in 1 shown in plan view) is cut.

Here are the suspension point 22 and the pad 8th on which the body 4 the sheet material for providing the cover 2 is arranged to move relative to each other. By this measure are how 1 shows several parallel to each other arranged cutting lines 30a . 30b . 30c respectively. 30d . 30e . 30f in the body 4 to cut the sheet material. Because of the better overview are in 1 only some of the lines of weakness 30a . 30b . 30c . 30d . 30e . 30f Assigned reference numbers.

In design, the body is 4 a first set of lines of weakness 30a . 30b . 30c and a second set of weakening lines 30d . 30e . 30f cut, with the lines of weakness 30a . 30b . 30c of the first set are arranged parallel to each other. Here cuts every line of weakness 30a . 30b . 30c the auxiliary line 10 depending on the definition, at an angle of 45 °. On the other hand, the weakening lines which are likewise arranged parallel to one another intersect 30d . 30e . 30f of the second sentence the auxiliary line 10 , depending on the definition, at an angle from -45 °. One weakening line each 30a . 30b . 30c of the first sentence intersects at least on or along the auxiliary line 10 one weakening line each 30d . 30e . 30f of the second sentence. For example, a first weakening line intersects 30a of the first sentence and a first line of weakness 30d of the second movement in a common central point 32 on the guide 10 at an angle of 90 °.

Further shows 1 in that immediately adjacent weakening lines 30a . 30b . 30c respectively. 30d . 30e . 30f each have variably adjustable distances. It is in 1 through a fourth double arrow 34 a first distance of about 10 mm and a fifth double arrow 36 a second distance of about 20 to 30 mm between two immediately adjacent, parallel lines of weakening 30a . 30b . 30c respectively. 30d . 30e . 30f indicated. Here is the distance from two immediately adjacent parallel lines of weakness 30a . 30b . 30c respectively. 30d . 30e . 30f the smaller, the smaller their distance from the central point 32 is and the bigger, the farther they are from the point.

In the embodiment of the method described here, the suspension point 22 the device 6 first moves in a first direction point by point along a path leading to the visible or at least virtually provided auxiliary line 10 is congruent, with the suspension point 22 each vertically above the auxiliary line 10 is arranged. Once the suspension point 22 above a designated point along the auxiliary line 10 is arranged, the pendulum knife 16 activated, passing through the blade 18 one weakening line each 30a . 30b . 30c of the first sentence in the body 4 is cut. In this case, the distance between immediately adjacent, to be cut lines of weakness 30a . 30b . 30c depending on their distance to the central point 32 set.

After that, the blade becomes 18 rotated by 90 ° and the suspension point 22 the device 6 now moved in a second direction point by point along the same path or moved point by point to the auxiliary line 10 is congruent. Once the above the auxiliary line 10 vertically arranged suspension point 22 a designated point along the auxiliary line 10 reached, the pendulum knife 16 activated, passing through the blade 18 one weakening line each 30d . 30e . 30f of the second sentence in the body 4 is cut. Again, the distance between immediately adjacent, to be cut lines of weakness 30d . 30e . 30f depending on their distance to the central point 32 set. This central point 32 is to be determined, for example, taking into account a shape of the contour.

Alternatively or additionally, it is possible the suspension point 22 and thus the pendulum knife 18 only in one direction once along the to the auxiliary line 10 to move congruent path. Once the suspension point 22 at one point along the track and thus perpendicular to the auxiliary line 10 is arranged, wherein at a corresponding point along the auxiliary line 10 two themselves on the auxiliary line 10 crossing lines of weakness 30a . 30b . 30c . 30d . 30e . 30f to be cut, first becomes a line of weakness 30a . 30b . 30c of the first sentence in the body 4 cut. Then the pendulum knife 16 as well as the blade 18 relative to the auxiliary line 10 rotated 90 ° and at the same point a line of weakness 30d . 30e . 30f of the second sentence in the body 4 cut.

To move the suspension point 22 as well as the blade 18 shows the embodiment of the device 6 a bracket 38 , eg a retaining rail, for the suspension point 22 on, with the suspension point 22 over the bracket 38 at one for a line of weakness 30 . 30a . 30b . 30c . 30d . 30e . 30f provided point along the track above the auxiliary line 10 is to be positioned. In addition, the device 6 a movement module 40 for the staff 20 and thus for the blade 18 on, this one in the holder 38 is integrated, and about a position or position of the rod 20 and therefore the blade 18 which are around by the suspension point 22 leading axis to be turned, is set. It is possible to use the rod 20 via the movement module 40 in an in 1 shown position in which the rod 20 and the blade 18 have a maximum deflection, to fix and the suspension point 22 at one point in each case for one of the immediately adjacent weakening line 30 . 30a . 30b . 30c . 30d . 30e . 30f is provided to arrange.

Are the suspension point 22 and the blade 18 arranged at a respectively designated point, the blade is 18 through the movement module 40 released from the maximum rash. The blade vibrates 18 in the direction of the body 4 of the sheet material and thereby cuts a line of weakness 30 . 30a . 30b . 30c . 30d . 30e . 30f in the body 4 , It is possible that the rod 20 and thus the blade 18 via the movement module 40 be driven by a motor. Alternatively or in addition, the staff 20 and the blade 18 reciprocate between two maximum deflections due to gravity acting on them.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011078789 B4 [0003]
• DE 10129618 A1 [0004]
• DE 102005016262 B4 [0005]
• WO 2014/062259 A1 [0006]
• DE 102007061848 A1 [0007]

Claims (21)

Method for providing a cover ( 2 ) for an airbag which is to be arranged in a housing to be covered by a cover which is to be arranged in an opening of a motor vehicle, the cover being bounded by a cover edge having a contour, the cover ( 2 ) is formed of sheet material having a front side and a rear side, wherein on the back of an auxiliary line ( 10 ) is provided, which is at least partially congruent with the contour of the lid edge, wherein the auxiliary line ( 10 ) on both sides enclosing corridor ( 12 ) is provided, wherein on the back of the sheet material within the corridor ( 12 ) with an at least partially curved blade ( 18 ) of a pendulum knife ( 16 ) in the sheet material several weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), which is the auxiliary line ( 10 ) each intersect at an angle, are cut, with a maximum penetration depth of the blade ( 18 ) of the pendulum knife ( 16 ) in a body ( 4 ) of the sheet material is less than a thickness of the body ( 4 ) is selected. Method according to Claim 1, in which the auxiliary line ( 10 ) is formed on the reverse mirrored to the contour. Method according to claim 1 or 2, in which the maximum penetration depth of the blade of the pendulum blade ( 16 ) at most 2/3 times the thickness of the body ( 4 ) is selected. Method according to one of the preceding claims, wherein at least a first set of a plurality of mutually parallel weakening lines (FIG. 30 . 30a . 30b . 30c . 30d . 30e . 30f ) is cut. Method according to one of the preceding claims, in which weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) which are the auxiliary line ( 10 ) at an angle of 45 °. Method according to one of the preceding claims, in which a plurality of lines of weakness which intersect at a respective angle (FIG. 30 . 30a . 30b . 30c . 30d . 30e . 30f ) get cut. Method according to Claim 6, in which at least two weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), which are located on the auxiliary line ( 10 ) to cut. Method according to Claim 6 or 7, in which at least two weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), which intersect at an angle of 90 °. Method according to one of claims 6 to 8, wherein at least a second set of a plurality of mutually parallel weakening lines (FIG. 30 . 30a . 30b . 30c . 30d . 30e . 30f ), the weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) of the at least one second set of weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) of the at least one first sentence. Method according to one of claims 4 to 9, in which distances from mutually parallel, immediately adjacent weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) can be varied. Method according to Claim 10, in which on the auxiliary line ( 10 ) at least one point ( 32 ) is defined, wherein in the back two mutually parallel, immediately adjacent and point-near lines of weakness ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) are cut, which have a minimum distance to each other, these two weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) under all mutually parallel lines of weakness ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) to the at least one point ( 32 ) have a minimum distance, wherein further mutually parallel, directly adjacent weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) leading to the at least one point ( 32 ) greater distances than the two near-point lines of weakness ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), to each other have a distance which is greater than the minimum distance between the two near-point lines of weakness ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ). Method according to Claim 11, in which the distance between two immediately adjacent weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), the larger the further these two lines of weakness ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) of the at least one point ( 32 ) on the auxiliary line ( 10 ) are removed. Method according to one of the preceding claims, characterized in that on the back with the weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) is arranged with the back side facing on the inner lining, the auxiliary line ( 10 ) is at least partially congruently positioned to the contour of the lid. Device having a pendulum knife ( 16 ) with an at least partially curved blade ( 18 ) and to provide a cover ( 2 ) Is designed for an airbag, wherein the Airbag is to be arranged in a housing which is to be covered by a cover which is to be arranged in an opening of an inner lining of a motor vehicle, wherein the lid is bounded by a lid edge having a contour, wherein the cover ( 2 ) is formed of sheet material having a front side and a rear side, wherein on the back of an auxiliary line ( 10 ) is provided, which is at least partially congruent with the contour of the lid edge, wherein the auxiliary line ( 10 ) on both sides enclosing corridor ( 12 ), the pendulum knife ( 16 ) is adapted to the back of the sheet material within the corridor ( 12 ) in the sheet material several weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), which is the auxiliary line ( 10 ) at an angle, to cut, with a penetration depth of the blade ( 18 ) of the pendulum knife ( 16 ) in a body ( 4 ) of the sheet material is less than a thickness of the body ( 4 ). Device according to Claim 14, in which the blade ( 18 ) of the pendulum knife ( 16 ) is bent convexly. Device according to claim 14 or 15, in which the blade ( 18 ) of the pendulum knife ( 16 ) is formed circular arc-shaped. Device according to one of claims 14 to 16, in which the blade ( 18 ) via a rod ( 20 ) with a suspension point ( 22 ) and around the suspension point ( 22 ) is to pivot. Cover for an airbag, which is to be arranged in a housing to be covered by a cover which is to be arranged in an opening of an interior trim of a motor vehicle, wherein the cover is bounded by a cover edge, which has a contour, wherein the cover ( 2 ) is formed of sheet material having a front side and a rear side, wherein on the back of an auxiliary line ( 10 ) is provided, which is at least partially congruent with the contour of the lid edge, wherein an auxiliary line ( 10 ) on both sides enclosing corridor ( 12 ) is provided, wherein on the back of the sheet material within the corridor ( 12 ) with an at least partially curved blade ( 18 ) of a pendulum knife ( 16 ) in the sheet material several weakening lines ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ), which is the auxiliary line ( 10 ) each intersect at an angle, are cut, with a maximum penetration depth of the blade ( 18 ) of the pendulum knife ( 16 ) in a body ( 4 ) of the sheet material is less than a thickness of the body ( 4 ) is selected. A cover according to claim 18, wherein each weakening line ( 30 . 30a . 30b . 30c . 30d . 30e . 30f ) has a longitudinal profile, the circular arc in the body ( 4 ) of the material is cut.  A cover according to claim 18 or 19 or 21, wherein the material is elastically deformable.  A cover according to any one of claims 18 to 20, wherein the material is formed of leather.

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