FR2814969A1 - Painting mask for motor vehicle glazing has masks assembled to follow line of curvature - Google Patents

Abstract

The painting mask (9) for a motor vehicle glazing has multiple masks formed into a package to allow masking of domed surfaces. The masking film can have a high resistance to oil and water on both faces. The film thickness can be less than two hundred microns. The masks can be stacked or placed in a pouch.

Description

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La présente invention est relative à un procédé et à un dispositif de masquage d'une partie d'un véhicule automobile, afin de protéger cette partie de salissures susceptibles de résulter de la peinture d'une autre partie de ce véhicule. Masking method and device

The present invention relates to a method and to a device for masking a part of a motor vehicle, in order to protect this part from dirt liable to result from the painting of another part of this vehicle.

 The technical field of the invention is that of automobile repair.

 It is known to protect the glazed parts of a motor vehicle before painting at least part of the bodywork, with masks covering these glazed parts.

 The term “glazed part” essentially means the unpainted parts of the vehicle, in particular the windshield, the rear window, the left and right side windows, the headlight and taillight optics, the exterior mirrors, and others. parts such as wheels, wheel covers or bumpers.

 For this masking operation, also called masking, paper packaged in a roll is usually used; for each organ to be protected, the operator manually cuts and / or tears a sheet of paper; the width of this sheet is that of the chosen paper roll, and the length of the sheet is approximately determined by the operator as a function of the dimensions of the member to be protected; this sheet therefore has two first parallel rectilinear edges, and two second edges whose shape and orientation result from the cutting technique used; in no case does the shape of the sheet thus formed correspond to that of the organ to be protected; the operator can then tear and / or crease the sheet in order to roughly adapt its outline to that of the organ to be protected; these operations are long and delicate, and it never results in a sheet of shape perfectly suited to that of the part to be protected.

 The object of the present invention is to remedy this problem, and for this purpose consists, according to a first aspect, in providing a strip of paper, which is preferably wound on a tubular mandrel to form a roll, from which are cut, in part, a plurality of masks of identical shape adapted to the shape of a glazed part of a given vehicle, and which comprises a plurality of first weakened link portions (of lesser resistance) extending between (and / or

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 separating) two adjacent masks from said strip, making it easier to separate the masks and preventing untimely tearing of the strip.

 Alternatively, the strip of paper can be zig-zag folded like listing paper.

 In the sense of the present application, the term paper designates, in addition to paper, non-metallic sheet materials, in particular plastics and laminated materials.

 In order to increase the mechanical strength of the paper strip, the latter may include at least one detachable lateral edge which extends continuously along one of its edges, and which is separated from said masks by a second weakened portion (of lower resistance) so as to facilitate its separation from said masks.

 According to a preferred embodiment, the paper strip has two continuous detachable side edges which extend respectively along each of its longitudinal edges.

 According to a preferred alternative embodiment, one or the other or the two detachable side edges are discontinuous; in this case, the outline of each of the masks has a part which is flush along at least one of the edges of the strip of paper, that is to say extends tangentially thereto, which contributes to reducing the falls unnecessary paper.

 In order to limit these paper scraps, said first weakened portions of connection between two masks have a very small width compared to the dimensions of the mask: the ratio of this width to the average dimension of a mask is preferably less than or equal to 10- 1; this ratio can go up to 10-2, 10-3 or 10-4, and can even in certain applications, be of zero value, when the contours of two adjacent masks are arranged tangentially to one another.

 Preferably, the ratio of the width of each of said lateral edges to said average size of the mask is situated in the same range of values as those indicated above concerning said connecting portions; by mean size of a mask is meant its equivalent diameter (D) which is calculated by the formula D = - \ / (4S / Tr), where S is the surface of the mask.

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 In order to limit falls and / or to limit the width of said first weakened connection portions, said masks can be arranged head to tail in pairs.

 In a preferred embodiment, the paper strip comprises a single plurality of identical masks; according to a preferred variant, the strip may include at least two pluralities of masks: a first plurality of identical first masks (for example of a shape adapted to that of a front side window of a given vehicle), and a second plurality of second identical mask (for example of a shape adapted to that of a rear side window of said vehicle).

 In this case, said first masks are arranged alternately with said second masks along the strip of paper.

 The weakening of the bonding portions and / or of the selvedges can be obtained by a perforation or a discontinuous cut of the paper strip, along a weakening line which can extend along at least one portion. of the outline of the masks, and which can be rectilinear or curvilinear, transverse, longitudinal, or oblique.

 In order to limit the number of paper strips necessary to mask all the glazed parts of a given vehicle, it is possible to nest on a paper strip 2,3, 4 (or more) masks of different shape.

 For the same purpose, one can also use a paper having absorbent properties of liquid or pasty products substantially identical for its two sides, so that a mask such as that of a front left window can indifferently be used to mask this window or to hide the symmetrical window, ie the front right window.

 It is also possible to include one or more small masks, such as headlight masks, inside a large mask, such as the windscreen mask (of the same vehicle).

 We can then separate the two masks along a weakened area extending along the outline of the mask of small dimensions; after separation of these two masks, the obviously created inside the large mask can be used to secure the mask to the glazed part using an adhesive tape

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 partially extending into the recess; this recess can (if necessary) easily be obscured by another sheet of roughly cut paper.

 In order to facilitate the separation of the masks precut in the paper strip and to optimize the number of masks per roll, preferably using a paper whose grammage is less than or equal to 200 g / m2, in particular less than or equal to 100 g / m2, for example of the order of 20 to 60 g / m2.

 In order to facilitate the maneuverability of the rollers, a strip of paper less than or equal to 1 m in width, of length less than or equal to 200 m, and of mass less than or equal to 20 kg is preferably used; for this purpose also, the diameter of the rollers will be limited to approximately 15 or 20 cm at most.

 According to another aspect, the invention consists in proposing a device for storing and distributing masks precut to the shapes of the glazed parts of several motor vehicles; the device comprises a plurality of parallel bars which are (each) capable of receiving one, or preferably several, roll (s) of paper; each roller comprises at least a plurality of pre-cut masks and forming a strip; the strip can be unrolled the length necessary to extract a mask therefrom, by rotation of the roller and / or of the bar supporting the roller; this rotation can result from a manual tensile force exerted on the free end of the paper strip.

 According to a preferred embodiment, the device comprises a plurality of bars (or shafts) supporting rollers, which are superimposed and are supported by a frame common to said bars; the spacing of the bars is preferably less than or equal to 30 cm.

 The invention provides a compact device, simple to manufacture and to use; in order to further improve its compactness, it may comprise two series of superimposed bars which extend in two substantially vertical planes.

 Preferably, the bars are of identical length, and their length allows them to receive several rolls side by side; it is thus possible to group together on a bar (or on two adjacent bars) the rollers comprising all the masks of a given vehicle model, in order to facilitate the location of the rollers on the storage and distribution rack.

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 Other advantages and characteristics of the invention will be understood through the following description which refers to the accompanying drawings, which illustrate without any limiting nature of the preferred embodiments of the invention.

 FIGS. 1 to 5 schematically illustrate five exemplary embodiments of a strip of paper comprising glass part masks of different shapes.

 FIG. 6 schematically illustrates a front view of a device (or rack) for storing and distributing masking masks, equipped with twelve rollers.

 FIG. 7 schematically illustrates in exploded perspective view the mechanical structure of a device for storing and distributing pre-cut masks and packaged in rolls.

 FIG. 8 illustrates on an enlarged scale the strip of paper of FIG. 3.

 FIG. 9 schematically illustrates in perspective an alternative embodiment in which the strip is folded.

 With reference to FIGS. 1 to 5 and 8 in particular, the paper strip 1 in which the masking masks are precut, is wound on a tubular mandrel of axis 2 to form a roll 3.

The unwound part of the strip 1 extends along an axis 4; the lateral edges 5 and 6 of the strip are parallel to the axis 4; the width 7 of the strip 1 in FIG. 1 is adapted to the width 8 of the identical masks 9 which are precut in this strip; each mask 9 can be modeled on the shape of a windshield of a given motor vehicle, and the masks 10, 11, 12, 13 and 14 precut in the bands of FIGS. 2 to 5 can respectively correspond to the shape of the front windows (masks 10a, 10b), rear windows (masks 11a, 11b, 12a, 12b, 12c, 12d), the rear view mirror (13a, 13b) and headlight covers (14) of said given vehicle.

Thus, for a type or model of vehicle can be provided from four to eight rollers, in particular the six rollers 31 to 36 of FIG. 6; the other six rollers 37 to 312 contain the masks of shape adapted to the glazed parts of a second type or model of vehicle; the various rollers adapted to a specific vehicle are grouped side by side on one or more adjacent bars 15 of the mask distribution device 16.

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The distributor 16 illustrated in FIG. 7 comprises eight first bars 15, parallel with a horizontal axis, and superimposed, which extend on the front face of the distributor and comprises eight second horizontal bars 152 superimposed which extend on the rear face of the distributor; the bars 15, 151, 152 are fixed on a frame 160 and arranged regularly spaced along a vertical axis.

The chassis rests on the ground by feet 17 and receives side panels 18,
19 and above 20 which house the rollers and receive signs indicating, for each bar and / or each roller, the vehicle and the corresponding glazed part.

 The masks 9, 10, 11 and 13 are in the form of curvilinear quadrilaterals while the masks 12a to 12d, which are of identical shape corresponding to that of a Custos' window (rear part of a rear window) of a vehicle , are in the shape of a curvilinear triangle, and the headlight masks 14 are in the shape of a tongue.

 The outline of the mask 9 is defined by four rectilinear sections 21 to 24 parallel two by two and connected by four curvilinear sections in the form of an arc of a circle; perforations and / or cut segments are disposed discontinuously along these sections and form a weakened outline around the mask 9, facilitating its separation from the portions of the paper strip which surround the mask; these portions consist of two side edges 25 and 26 of small width 53, and two connecting portions 27 and 28, of width also small.

 The edges 25, 26 extend between the edge 5 of the strip 1 and the straight section 21 on the one hand, and between the edge 6 of the strip 1 and the straight section 23 on the other hand.

 Each connecting portion 27, 28 extends between two masks 9 consecutively provided on the strip 1, and comprises a weakened section 29 perforated and / or cut discontinuously, which extends from one edge 5 to the other 6 of strip 1, along a straight line perpendicular to these edges.

 Similarly, the strips illustrated in FIGS. 2 to 5 comprise transverse connecting portions between two adjacent masks which are weakened by the presence of perforated and / or precut lines 30 to 33 which extend perpendicular to the edges 5,6.

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 In addition, the strip illustrated in FIG. 2 comprises an oblique connection portion between two masks 10a, 10b which extends along (and includes) an oblique line (with respect to the edges 5, 6) perforated 34; similarly, an oblique connecting strip including an oblique pre-cutting line 35 separates two adjacent masks 14 arranged head to tail (FIG. 5).

 In the embodiment illustrated in Figures 3 and 8, the strip 1 comprises a plurality of masks 11 a, 11 b of identical shape, which are arranged alternately with a plurality of masks 12a, 12b, 12c and 12d of identical shape, arranged symmetrically relative to the axis 4, and which are nested in pairs between two masks 11 a, 11b, the shape of the masks 12a to 12d being different from that of the masks 11 a, 11 b.

 In this embodiment, the strip comprises transverse connecting portions 36 weakened by the perforated lines 31, as well as longitudinal connecting portions 37 weakened by longitudinal perforated lines 38 parallel to the axis 4.

 In the embodiment illustrated in FIG. 9, the strip 1 of paper only consists of a plurality of masks 50 of rounded rectangular shape; two adjacent masks are secured by a rectilinear precut part 51 of outline; thus the strip is devoid of side edges, these being separated from the strip during its manufacture; in this exemplary embodiment, the width of the transverse connecting portions 51 between two adjacent masks is zero. The strip 1 is folded along the precut lines 51 which extend perpendicular to the edges 5, 6, so as to form a stack 52 of masks 50.

 The strips can in particular be made of paper whose grammage is close to 40 to 45 g / m2.

Claims (15)

1. Strip (1) for masking paper of a part of a motor vehicle characterized in that it comprises a plurality of masks (9 to 14.50) identical in shape adapted to that of said part, and a plurality of weakened connecting portions (27, 28, 36, 37, 51) separating two adjacent masks.  2. Strip according to claim 1, which is wound on a mandrel to form a roller (3). 3. Strip according to claim 1 which is folded in a zig-zag to form a stack (52). 4. Strip according to any one of claims 1 to 3, which further comprises at least one detachable edge (25,26). 5. Strip according to any one of claims 1 to 4, in which the masks are flush along one of the edges (5,6) of said strip (1). 6. Strip according to any one of claims 1 to 5 in which the ratio of the width (53) of the connecting portions, and where appropriate of the selvedges, to the average dimension of a mask is less than 10- ', in particular located in a range from 10-2 to 10-4. 7. Strip according to any one of claims 1 to 6, which comprises masks (10a, 10b, 13a, 13b, 14) arranged head to tail in pairs. 8. Strip according to any one of claims 1 to 7, which comprises a plurality of first identical masks (11a, 11b) which are arranged alternately with a plurality of second identical masks (12a to 12d) and different from said first masks. 9. Strip according to any one of claims 1 to 8, in which the weakened connection portions comprise perforations or discontinuous cuts extending along transverse sections (29 to 35) rectilinear or curvilinear. 10. A strip according to claim 9, in which transverse sections (34, 35) are oblique. <Desc / Clms Page number 9>  11. A strip according to any one of claims 1 to 10, in which the paper has a capacity for absorbing liquid or pasty products which is substantially identical on its two faces, and whose grammage is less than or equal to 200 g / m2. 12. Strip (1) according to any one of claims 1 to 11, which is shaped

 in a roll (3) of width less than or equal to 1 m and of length less than 200 m. 13. A method of masking a glazed part of a motor vehicle using a paper mask packaged in a strip in which a strip is used according to any one of claims 1 to 12. 14. Device (16) for storing rolls (3) of strip (1) of paper according to any one of claims 1 to 12, which comprises a plurality of bars or shafts (15) each capable of receiving at at least one roller (3), and a frame (160) on which the bars or shafts are arranged superimposed and parallel to each other. 15. Device according to claim 14 which comprises two stacks (151, 152) of bars superimposed vertically along two sides of the device, and which comprises panels (18 to 20) for protection and display of signs.