Protective device for a motor vehicle interior

Abstract

A protective device comprising two guide channels, each extending longitudinally parallel to a longitudinal axis, a flexible surface structure that can be displaced along the longitudinal axis between a protective position and a rest position, and at least two guide bands that are connected to each of the lateral edge regions of the flexible surface structure, and which are each slidably movable along the longitudinal axis and positively locked in each of the guide channels along the transverse axis, wherein the flexible surface structure is held on the guide channels by means of the guide bands stretched outwards along the transverse axis and can be displaced between the protective position and the rest position guided on the guide channels, is known.According to the invention, the lateral edge regions of the flexible surface structure each have a series of slots, wherein the slots each extend from a top surface to a bottom surface of the flexible surface structure, and wherein the guide bands each have a series of tabs, wherein the tabs each project laterally outwards along the transverse axis and form a toothed outer edge of the respective guide band, and wherein the tabs are pushed outwards along the transverse axis through the slots, whereby the toothed outer edges are positively connected to the respective edge region of the flexible surface structure.

Description

The invention relates to a protective device for a motor vehicle interior, having two guide channels, which are each elongated parallel to a longitudinal axis, a flexible sheet material, which can be displaced along the longitudinal axis between a protective position and a rest position, and at least two guide belts, which are each connected to a lateral edge region of the flexible sheet material and which are each held in one of the guide channels in a slidingly movable manner along the longitudinal axis and in a form-fitting manner along the transverse axis, wherein the flexible sheet material is held on the guide channels such that it is stretched outwards along the transverse axis by means of the guide belts and can be displaced between the protective position and the rest position in a guided manner on the guide channels.A protective device of this type is known from DE 10 2014 223 022 B3 and is provided in the form of a shading device for a motor vehicle interior. In the known protective device, the lateral edge regions of the flexible sheet material have thin connecting strands made of metal, which are welded to the respective guide strip.In addition, protective devices of the aforementioned type are known from the prior art, in which the guide bands are made of plastic and are sewn and / or glued to the edge regions of the flexible sheet-like structure.It is the object of the invention to provide a protective device of the type mentioned at the beginning which offers advantages over the prior art. In particular, a simplified production and a reliable connection between the guide bands and the flexible sheet-like structure are to be achieved.This object is achieved by providing a protective device having the features of claim 1. Advantageous refinements are specified in the dependent claims. The wording of the claims is made the subject matter of the description by reference.In the protective device according to the invention, the lateral edge regions of the flexible sheet material each have a row of slots. The slots each extend from an upper side to an underside of the flexible sheet material. The guide belts each have a row of straps. The tabs each protrude laterally outwards along the transverse axis and form a toothed outer edge of the respective guide band. The tabs are pushed outwards through the slots along the transverse axis, whereby the toothed outer edges are connected in a positive-locking manner to the respective edge region of the flexible sheet-like structure. The solution according to the invention allows a particularly simple and yet reliable connection between the guide bands and the edge regions of the flexible sheet-like structure. The solution according to the invention makes it possible to dispense with the complicated sewing, adhesive bonding and / or welding of the edge regions to the guide tapes. This significantly simplifies the production and assembly of the protective device and significant cost savings are achieved compared to solutions known from the prior art. The lateral edge regions of the flexible sheet material can also be referred to as longitudinal sides. The lateral edge regions are opposite each other along the transverse axis. Each edge region has a row of slots. Preferably, the row of slots each extends over an entire length of the relevant edge region. The guide bands are each extended along the transverse axis between an outer edge and an inner edge, wherein the outer edge is toothed as a result of the row of lugs arranged there. The tabs may also be referred to as protrusions. Preferably, the row of flaps extends over an entire length of the respective guide band. For the purpose of connection to the respective edge region of the flexible sheet-like structure, the guide belts are each guided along the transverse axis laterally outwards with the tabs leading through the slots. Outward means facing away from a central region of the flexible sheet material along the transverse axis. In the protective position, the flexible planar structure is stretched out in a planar manner along the longitudinal axis and along the transverse axis. In one embodiment, the flexible sheet material is wound in the rest position, preferably on a winding shaft. In a further embodiment, the flexible sheet-like structure is also stretched out in a planar manner in the rest position, wherein a mere displacement of the flexible sheet-like structure along the longitudinal axis is provided between the protection position and the rest position. The slits can be made in the flexible sheet in any manner suitable for the present purpose. The tabs can have any shape suitable for the present purpose and-in plan view-can be, for example, serrated, wavy, angular, in particular rectangular, trapezoidal and square, and / or rounded. In one embodiment, the tabs lie flat on the upper side of the flexible sheet material, wherein the remaining sections of the relevant guide band lie flat on the lower side of the flexible sheet material. In a further embodiment, the tabs lie flat on the underside of the flexible sheet material, wherein the remaining sections of the relevant guide band lie flat on the upper side of the flexible sheet material. The form fit between the outer edges and the respective edge region acts outwards along the transverse axis, i.e. on one side. Along the longitudinal axis, the form-fit acts on both sides, i.e. forwards and backwards. By inserting the tabs into the slots and by arranging the guide band flat in the edge region, at least in the fully assembled state of the protective device, a positive fit is additionally obtained in the thickness direction of the flexible sheet-like structure, i.e. along a vertical axis.In one embodiment of the invention, the guide belts are exclusively connected to the flexible sheet material via the toothed outer edges. In this embodiment, no additional joining connections are present between the guide bands and the flexible sheet-like structure. This allows particularly simple and cost-effective production.In a further embodiment of the invention, additional joining connections are provided between the guide belts and the sheet-like structure. The additional joining connections serve to secure the positive fit between the respective toothed outer edge and the edge region of the flexible sheet-like structure. The additional joining connections can be formed in any manner suitable for the present purpose, for example as a seam, adhesive and / or welded connection.In a further embodiment of the invention, the guide belts are manufactured from a metal strip. This embodiment of the invention is based on the consideration that guide belts for generic protective devices are often made of PTFE plastic. Such plastics are not completely harmless to health and can therefore be perceived as disadvantageous. By manufacturing the guide bands from metal band, the use of PTFE plastic can be dispensed with. In addition, the straps can be formed particularly easily, for example by machining the outer edge of the guide belts with a suitable separating method. For example, the tabs can be cut out of the metal strip, for example by laser. Alternatively, the tabs may be punched out.In a further embodiment of the invention, the metal strip is a spring steel strip which, starting from a flat elongated configuration, can be automatically transferred into a spirally wound configuration. This embodiment of the invention is advantageous in particular when the flexible sheet material is wound up in the rest position. In this case, the guide strips manufactured from the spring steel strip bring about an automatic return of the flexible sheet-like structure from the protective position into the rest position. This makes it possible to dispense with a separate spring motor or other winding motor for winding up the flexible sheet material. The construction and the production of the protective device are thereby further simplified.In a further embodiment of the invention, the guide belts have a slide coating at least on the toothed outer edges and / or the brackets. The slide coating reduces friction when inserting the tabs into the slots. The reduced friction simplifies the mounting of the guide bands on the flexible sheet-like structure. In addition, damage to the slots when the tabs are inserted is counteracted.In a further embodiment of the invention, the guide belts have a ground surface and / or a ground edge at least on the toothed outer edges and / or the lugs. The ground surface and / or the ground edge can reduce friction when the tabs are inserted into the slots. This results in the advantages already disclosed with respect to the preceding embodiment. In addition, the ground surface and / or ground edge can achieve improved durability of the guide belts, since cracking in the region of the toothed outer edges is counteracted. In one embodiment, the toothed outer edges each have rounded inner corners. This also counteracts crack formation.In a further embodiment of the invention, the flexible sheet material has a protection against tearing and / or ripping in the region of the slots. As a result of the protection, damage to the slots by the lugs is counteracted both during the assembly and during the operation of the protection device. The protection can be formed in any manner suitable for the present purpose. For example, the flexible sheet material can be provided with a coating, doubling, additional seams, melting edges or the like in the region of the slits.In a further embodiment of the invention, the slots are each sewn into the flexible sheet material in the manner of a button hole and each have a circumferential seam. This embodiment of the invention permits particularly simple production of the slots. By sewing the slits into the flexible sheet material, particularly simple production is made possible. In addition, the circumferential seam forms a protection against tearing out and / or ripping out of the respective slot.In a further embodiment of the invention, the flexible sheet material is manufactured from a thermoplastic plastic material, wherein the slits are fused into the flexible sheet material and have a circumferential melting edge. This embodiment of the invention also permits a particularly simple configuration of the slots and thus a further simplified production of the protective device. The circumferential melting edge protects the respective slot against tearing and / or ripping. In one embodiment, the slits are fused into the flexible sheet material with a laser beam. In a further embodiment, the slits are fused into the flexible sheet material using a heated tool, for example using a hot knife or the like.In a further embodiment of the invention, the guide belts are each curved along the transverse axis. In one embodiment, a respective top side of the guide belts is concave and a bottom side is convex. In one embodiment, the upper side of the guide belts is each convex and the lower side is concave. By means of the mentioned curvature of the guide bands, a further improved connection to the flexible sheet-like structure can be achieved.In a further embodiment of the invention, the tabs have different widths along the transverse axis. This makes it possible to simplify the insertion of the tabs into the slots.In a further embodiment of the invention, the tabs are arranged at different distances along the longitudinal axis. Alternatively or additionally, the tabs may be of different lengths. In a further embodiment of the invention, the slots are arranged at different distances along the longitudinal axis. Alternatively or additionally, the slots may be of different lengths.The invention also relates to an arrangement for a protective device of a motor vehicle interior, comprising a flexible planar structure which is displaceable along a longitudinal axis between a protective position and a rest position, and at least two guide bands which are each connected to a lateral edge region of the flexible planar structure and which are configured to be held in a guide channel in a slidingly movable manner along the longitudinal axis and in a form-fitting manner along a transverse axis. In the arrangement according to the invention, the lateral edge regions of the flexible sheet material each have a row of slots. The slots each extend from an upper side to an underside of the flexible sheet material. The guide belts each have a row of straps. The tabs each protrude laterally outwards along the transverse axis and form a toothed outer edge of the respective guide band. The tabs are pushed outwards through the slots along the transverse axis, whereby the toothed outer edges are connected in a positive-locking manner to the respective edge region of the flexible sheet-like structure. The arrangement according to the invention can also be referred to as a roller blind web. The roller blind web has a particularly simple structure. For the further advantages which result, reference is made to the disclosure relating to the protective device according to the invention. Embodiments of the arrangement according to the invention result from the embodiments of the protective device according to the invention, which are mutatismutatistically.The invention also relates to a motor vehicle having a protective device according to the preceding description.Further advantages and features of the invention are evident from the claims and from the following description of a preferred exemplary embodiment of the invention, which is illustrated on the basis of the drawings.The following are shown: FIG. 1 shows a schematic perspective view of an embodiment of a protection device according to the invention, which is arranged in the form of a shading device in a glass roof region of a passenger vehicle, FIG. 2 shows a schematic plan view of a flexible sheet material of the protective device according to FIG. 1, wherein the flexible sheet material is shown cut off on both sides in the longitudinal direction, FIG. 3 shows a schematic plan view of a guide band of the protective device according to FIG. 1, wherein the guide band is shown cut off on both sides in the longitudinal direction, FIG. 4 shows the guide belt according to FIG. 3 in a schematic cross section along a section line IV-IV according to FIG. 3, FIGS. 5, 6 show the flexible sheet material according to FIG. 2 together with two guide belts according to FIG. 3, which are fastened to lateral edge regions of the flexible sheet material, in a schematic bottom view (FIG. 5 ) and a schematic top view (FIG. 6 ), FIG. 7 is a schematic cross-sectional view of one of the edge regions of the flexible sheet material together with the relevant guide band and a guide channel of the protective device according to FIG. 1 along a section line VII-VII according to FIG. 6 ; and FIG. 8 shows a sectional illustration corresponding to FIG. 7 along a section line VIII-VIII according to FIG. 6.According to FIG. 1, a protective device 1 is provided as a shading device for a glass roof 102 of a passenger car 100. The protective device 1 is arranged in an interior 101 of the motor vehicle 100 and is therefore illustrated in dashed lines in FIG. 1.The protective device 1 has two guide channels 2, 2', a flexible sheet-like structure 3 and two guide belts 4, 4'.The guide channels 2, 2' are each elongated parallel to a longitudinal axis X and mounted on the vehicle side in the region of the glazed roof 102 in a manner known to the person skilled in the art. The guide channels 2, 2' are also referred to below as left guide channel 2 and right guide channel 2'.The flexible sheet 3 is displaceable along the longitudinal axis X between a protection position and a rest position. The protective position is schematically shown in FIG. 1. In the protective position, the flexible sheet-like structure 3 is stretched out two-dimensionally along the longitudinal axis X and a transverse axis Y in order to shade the glazed roof 102.In the embodiment shown, the flexible sheet 3 is wound on a winding shaft 5 in the rest position. The winding shaft 5 is mounted on the vehicle side at a rear end of the glazed roof 102 with respect to the longitudinal axis X. The winding shaft 5 is optional and consequently not provided in all embodiments of the protection device.The guide belts 4, 4' are arranged on lateral edge regions 31, 31' (see FIG. 2 ) of the flexible sheet material 3. Hereinafter, the guide belts 4, 4' are also referred to as left guide belt 4 and right guide belt 4'. The guide belts 4, 4' are connected to the flexible sheet-like structure 3 in a manner described in more detail below. The guide belts 4, 4' are each slidably movable along the longitudinal axis X and are each positively held in one of the guide channels 2, 2' along the transverse axis Y. The left guide band 4 is held in the left guide channel 2. The right guide band 4' is held in the right guide channel 2'.The flexible sheet-like structure 3 is held on the guide channels 2, 2' so as to be stretched outwards along the transverse axis Y by means of the guide belts 4, 4' and is displaceable in a guided manner between the protective position and the rest position on the guide channels 2, 2'.The flexible sheet 3 is shown in detail in FIG. 2 and has a row of slits 32, 32' in each case on its lateral edge regions 31, 31'. The lateral edge regions 31, 31' are also referred to below as left edge region 31 and right edge region 31'. The arrangement and / or configuration of the slots 32, 32' in the edge regions 31, 31' is identical. To avoid repetitions, therefore, reference is made in the following primarily to the left edge region 31. The disclosure relating to the left edge region 31 also applies mutatismutatally to the right edge region 31'. The slits 32, 32' each extend from an upper side 33 (see FIG. 6 ) to a lower side 34 (see FIG. 5 ) of the flexible sheet 3.The guide belts 4, 4' each have a row of lugs 41, 41', the left guide belt 4 being shown in detail in FIG. 3. The design of the guide belts 4, 4' is symmetrical with respect to a vertical central longitudinal plane of the protective device 1. To avoid repetitions, therefore, reference is primarily made to the left guide belt 4. The disclosure relating to the left guide band 4 also applies mutatismutatally to the right guide band 4'.The tabs 41 each protrude laterally outwards along the transverse axis Y and form a toothed outer edge 42 of the guide band 4.In FIGS. 5 and 6, the guide belts 4, 4' are joined to the respective lateral edge region 31, 31' of the flexible sheet 3. For this purpose, the tabs 41, 41' are pushed outwards along the transverse axis Y through the slots 32, 32', whereby the toothed outer edge 42, 42' of the respective guide band 4, 4' is connected in a positive-locking manner to the relevant edge region 31, 31' of the flexible sheet material 3.With respect to the plane of the drawing of FIG. 6, the tabs 41 of the left guide band 4 are pushed from right to left through the slots 32 of the edge region 31. The tabs 41' of the right guide band 4' are pushed from left to right through the slots 32' of the right edge region 31'. The toothed outer edges 42, 42' are thereby connected in each case outwards in a form-fitting manner to the flexible sheet-like structure 3 along the transverse axis Y. In addition, a positive connection acting on both sides, i.e. forwards and backwards, along the longitudinal axis X is present.FIGS. 7 and 8 show the arrangement of flexible sheet material 3 and the guide belts 4, 4' in the region of the left guide belt 4 in engagement with the left guide channel 2. In the embodiment shown, the guide channel 2 is formed on a guide rail 20. The guide band 4 engages in the guide channel 2 in a form-fitting manner along the transverse axis Y. In addition, the guide band 4 is also held in the guide channel 2 in a form-fitting manner along the vertical axis Z.Further specific features of the embodiment shown are explained below.In the embodiment shown, the flexible sheet 3 extends along the transverse axis Y between a left outer edge 35 and a right outer edge 36. Along the longitudinal axis X, the sheet material 3 is elongated between a front edge 37 and a rear edge 38. In the present case, the rear edge 38 is fastened to the winding shaft 5 such that it can be wound up and unwound in a manner known to the person skilled in the art. The front edge 37 can be provided with a pull-out profile, for example. The flexible sheet-like structure 3 has a rectangular basic shape with straight edges in plan view.The left edge region 31 has the left outer edge 35 and the right edge region 31' has the right outer edge 36.The slots 32, 32' are in the present case elongated parallel to the relevant outer edge 35, 36. The outer edges 35, 36 are elongated parallel to each other.In the present case, the edge regions 31, 31' are slit over their entire length, i.e. are provided with the slits 32, 32'. The number of slots 32, 32' (and also tongues 41, 41') visible in FIGS. 2, 5, 6 is to be understood as merely exemplary.In the embodiment shown, the slots 32, 32' each have a length L1 extending along the longitudinal axis X. Slots adjacent to one another are spaced apart from one another at a longitudinal distance A 1 along the longitudinal axis X. Along the transverse axis Y, the slots 32, 32' are each set back at a distance B1 from the relevant outer edge 35, 36. The slots 32, 32' are each elongated, in particular straight, between a rear slot end 321 and a front slot end 322.In the embodiment shown, the slits 32, 32' are each provided with a protection P which acts against tearing and / or ripping of the flexible sheet 3. The protection P is formed in different ways in different embodiments.In one embodiment, the slits 32, 32' are each sewn into the flexible sheet 3 in the manner of a button hole and have a circumferential seam N. The circumferential seam N acts as a guard P.In a further embodiment, the flexible sheet 3 is made of a thermoplastic material T and the slits 32, 32' are fused into the flexible sheet 3. In this case, the slits 32, 32' have a circumferential melting edge K, which in turn functions as a guard P.In the present case, both embodiments (button hole with circumferential seam, fused slot with melting edge) are shown jointly in FIG. 2.In the embodiment shown, the left guide band 4 extends along the transverse axis Y between the toothed outer edge 42 and an inner edge 43. The same applies analogously to the right-hand guide belt 4'. Both guide belts 4, 4' are elongated along the longitudinal axis X between a rear end and a front end (without reference numerals). The length of the guide belts 4, 4' corresponds in each case approximately to a length of the flexible sheet material 3. The same applies to the right guide belt 4'. In cross section, the guide belts 4, 4' are each approximately rectangular in the present case, wherein the extent in the thickness direction, i.e. along the vertical axis Z, is substantially less than the extent in the width direction, i.e. along the transverse axis Y. The latter is once again substantially less than the longitudinal extent.In the embodiment shown, the tabs 41, 41' each have a length L2 extending along the longitudinal axis X. Immediately adjacent tabs are spaced apart from each other by a longitudinal distance A2. In the embodiment shown, the tabs 41, 41' each have a width B2 extending along the transverse axis Y.The length L1 of the slots 32, 32' and the length L2 of the tabs 41, 41' are matched to one another. Specifically, the length L2 of the tabs 41, 41' is slightly less than the length L1 of the slots 32, 32'. This simplifies the insertion of the lugs 41, 41' into the slots 32, 32'. The same applies analogously to the distances A1, A2, the distances A2 between adjacent lugs 41, 41' being slightly greater than the distances A1 between adjacent slots 32, 32'.In the embodiment shown, the width B2 of the tabs 41, 41' corresponds approximately to the transverse distance B1 of the slots 32, 32' from the relevant outer edge 35, 36 of the flexible sheet material 3. In the inserted state of the guide bands 4, 4', the relevant toothed outer edge 42, 42' is consequently aligned flush with the relevant outer edge 35, 36 (see also FIGS. 5, 6 ).In the embodiment shown, the guide belts 4, 4' are made of a metal strip M. The metal strip M serves as a semi-finished product for the production of the guide strips 4, 4'. The toothed outer edge 42, 42' is formed in the embodiment shown by means of a punching operation of the metal strip M. Alternatively, the tabs 41, 41' can be separated from the metal strip M by a laser beam or by another separating method.The metal strip M is in the present case a spring steel strip F. The spring steel strip F can be automatically transferred starting from a flat configuration into a spirally wound configuration.In order to simplify the insertion of the lugs 41, 41' into the slots 32, 32' and to avoid damage to the flexible sheet-like structure by the lugs 41, 41', the guide belts 4, 4' have a sliding coating C at least on the respective toothed outer edge 42, 42' and / or the lugs 41, 41'. The slide coating reduces the friction when the tabs 41, 41' are inserted into the slots 32, 32'. The slide coating may be formed of any material suitable for the present purpose, for example, a plastic, a wax, a grease, or the like.In the present case, the guide belts 4, 4' have a ground surface S1 and / or a ground edge S2 at least on the respective toothed outer edge 42, 42' and / or the lugs 41, 41'. In the present case, the brackets 41, 41' are ground both on the upper side 44 and on the lower side 45 of the guide belt 4, 4'. In addition, the toothed outer edge 42, 42' is ground throughout. The ground surface S 1 and / or the ground edge S 2 prevent burrs, such as may be produced, for example, by punching processing. Such burrs can lead to damage to the flexible sheet 3 during the assembly or operation of the protective device 1. In addition, the burrs may promote cracking on the guide tapes 4 themselves, whereby their fatigue strength can be reduced. All this is counteracted by the ground surface S 1 and / or the ground edge S 2.In the embodiment shown, there are no additional joining connections between the guide belts 4, 4' and the flexible sheet material 3. The connection is formed solely by the insertion of the lugs 41, 41' into the slots 32, 32'.In the embodiment shown, the tabs 41, 41' are pushed from the bottom side 34 onto the top side 33 through the slots 32, 32'. In the inserted state, the tabs 41, 41' lie flat on the upper side 33 of the flexible sheet-like structure (see in particular FIGS. 7, 8 ). The toothed outer edge 42, 42' is consequently arranged on the upper side 33 of the flexible sheet 3. In contrast, the inner edge 43 facing away from the toothed outer edge 42, 42' is arranged on the underside 34 of the flexible sheet 3.In the embodiment shown, the guide channel 2 has an undercut 21, which is arranged along the vertical axis Z between the underside 34 of the flexible sheet-like structure 3 and the upper side 44 of the guide band 4. At the lateral edge regions 31, 31', the underside 34 rests on an upper side of the undercut 21. Away from the brackets 41, 41', the upper side 44 of the guide belts 4, 4' rests on the underside on the undercut 21.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2014 223 022 B3

[0002]

Claims

A protective device (1) for a motor vehicle interior (101), comprising two guide channels (2, 2') which are each elongated parallel to a longitudinal axis (X), a flexible sheet-like structure (3) which is displaceable along the longitudinal axis (X) between a protective position and a rest position, and at least two guide belts (4, 4') which are each connected to a lateral edge region (31, 31') of the flexible sheet-like structure (3) and which are each held in one of the guide channels (2, 2') in a slidingly movable manner along the longitudinal axis (X) and in a form-fitting manner along the transverse axis (Y), wherein the flexible sheet-like structure (3) is held on the guide channels (2, 2') such that it is stretched outwards along the transverse axis (Y) by means of the guide belts (4, 4') and is displaceable on the guide channels (2, 2') such that it is guided between the protective position and the rest position, characterized in that, the lateral edge regions (31, 31') of the flexible sheet-like structure (3) each have a row of slots (32, 32'), wherein the slots (32, 32') each extend from an upper side (33) to a lower side (34) of the flexible sheet-like structure (3), and the guide bands (4, 4') each have a row of lugs (41, 41'), wherein the lugs (41, 41') each project laterally outwards along the transverse axis (Y) and form a toothed outer edge (42, 42') of the respective guide band (4, 4'), and wherein the lugs (41, 41') are pushed outwards through the slots (32, 32') along the transverse axis (Y), whereby the toothed outer edges (42, 42') are connected in a positive-locking manner to the respective edge region (31, 31') of the flexible sheet-like structure (3).The protection device (1) according to claim 1, wherein the guide bands (4, 4') are exclusively connected to the flexible sheet (3) via the toothed outer edges (42, 42'), and no additional joining connections are present between the guide bands (4, 4') and the flexible sheet (3).The protective device (1) according to claim 1, wherein additional joining connections are provided between the guide belts (4, 4') and the sheet-like structure (3).The protection device (1) according to any one of the preceding claims, wherein the guide belts (4, 4') are made of a metal strip (M).The protective device (1) according to claim 4, wherein the metal strip (M) is a spring steel strip (F) which, starting from a flat elongated configuration, can be automatically converted into a spirally wound configuration.The protection device (1) according to any one of the preceding claims, wherein the guide belts (4, 4') have a sliding coating (C) at least on the external toothed edges (42, 42') and / or the tabs (41, 41').The protection device (1) according to any one of the preceding claims, wherein the guide belts (4, 4') have, at least at the external toothed edges (42, 42') and / or the lugs (41, 41'), a ground surface (S1) and / or a ground edge (S2).The protection device (1) according to any one of the preceding claims, wherein the flexible sheet (3) has a protection (P) against tearing and / or ripping in the region of the slots (32, 32').The protection device (1) according to any one of the preceding claims, wherein the slots (32, 32') are each sewn into the flexible sheet (3) in the manner of a head hole and have a circumferential seam (N).The protection device (1) according to any one of the preceding claims, wherein the flexible sheet (3) is made of a thermoplastic plastic material (T), and wherein the slits (32, 32') are fused into the flexible sheet (3) and have a circumferential melting edge (K).

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