Abstract
A roller blind device for a vehicle interior including a roller blind shaft and a flexible textile sheet material, an end region of which is secured to the roller blind shaft in order to be wound and unwound relative to the roller blind shaft. The end region of the textile sheet material surrounds an outer casing of the roller blind shaft in the form of a loop which is annularly closed.
Claims
1. A roller blind device for a vehicle interior, having a roller blind shaft and a flexible textile sheet material, an end region of which is fixed to the roller blind shaft in order to be able to be wound and unwound relative to the roller blind shaft, wherein the end region of the textile sheet material encloses an outer casing of the roller blind shaft in the form of a loop, which is annularly closed.
2. The roller blind device as claimed in claim 1, wherein the annular closure of the loop is produced by a fixing seam, extending transversely with respect to a winding device, of a front edge region of the textile sheet material on a surface section of the textile sheet material, and the outer casing of the roller blind shaft is assigned an adhesive strip, which is arranged opposite to the fixing seam such that when the textile sheet material is loaded in tension, substantially radial compressive forces—relative to an axis of rotation of the roller blind shaft—act through the loop of the textile sheet material on the adhesive strip.
3. The roller blind device as claimed in claim 1, wherein the outer casing of the roller blind shaft has at least one, or two different, radial offset steps which each extend over part of a circumference of the outer casing, and in which an outer diameter of the outer casing is reduced as compared with a complete cylindrical shape of the outer casing.
4. The roller blind device as claimed in claim 3, wherein a radial offset step is configured such that the radial offset step compensates for the dimensions of the adhesive strip in the circumferential direction and in the radial direction on the roller blind shaft relative to the complete cylindrical shape of the outer casing.
5. The roller blind device as claimed in claim 3, wherein a further radial offset step is configured such that the further radial offset step compensates for the dimensions of the loop in the circumferential direction and in the radial direction if a fold is formed by winding the textile sheet material onto the outer casing.
6. The roller blind device as claimed in claim 3, wherein the at least two radial offset steps overlap one another in the circumferential direction or are at least partly arranged to be offset relative to one another in the circumferential direction.
7. A roller blind device for a vehicle interior, the roller blind device having a roller blind shaft and a flexible textile sheet material, an end region of which is fixed to the roller blind shaft in order to be able to be wound and unwound relative to the roller blind shaft, wherein in at least one casing section offset in the circumferential direction relative to at least one radial offset step, the roller blind shaft is provided with material recesses in order to achieve a uniform mass distribution of the roller blind shaft.
8. The roller blind device as claimed in claim 7, wherein the material recesses are configured as hollow profiles extending over an entire length of the roller blind shaft.
9. The roller blind device as claimed in claim 8, wherein the hollow profiles are radially outwardly open to the outer casing, forming longitudinal slots, of which an opening cross section is matched to an inherent stiffness of the textile sheet material when the latter is wound onto the roller blind shaft, such that the textile sheet material does not fall into the longitudinal slot when wound onto the outer casing.
10. A roller blind shaft for a roller blind device, wherein an outer casing of the roller blind shaft has at least one, or two different, radial offset steps which each extend over part of a circumference of the outer casing, and in which an outer diameter of the outer casing is reduced as compared with a complete cylindrical shape of the outer casing.
11. (canceled)
12. The roller blind shaft according to claim 10, wherein a radial offset step is configured such that the radial offset step compensates for dimensions of an adhesive strip in the circumferential direction and in the radial direction on the roller blind shaft relative to the complete cylindrical shape of the outer casing.
13. The roller blind shaft according to claim 12, wherein a further radial offset step is configured such that the further radial offset step compensates for dimensions of a loop of a textile sheet material in the circumferential direction and in the radial direction if a fold is formed by winding the textile sheet material onto the outer casing.
14. The roller blind shaft according to claim 13, wherein the radial offset steps overlap one another in the circumferential direction or are at least partly arranged to be offset relative to one another in the circumferential direction.
15. The roller blind shaft according to claim 10, wherein in at least one casing section offset in the circumferential direction relative to at least one radial offset step, the roller blind shaft is provided with material recesses in order to achieve a uniform mass distribution of the roller blind shaft.
16. The roller blind shaft according to claim 15, wherein the material recesses are configured as hollow profiles extending over an entire length of the roller blind shaft.
17. The roller blind shaft according to claim 16, wherein the hollow profiles are radially outwardly open to the outer casing, forming longitudinal slots, of which an opening cross section is matched to an inherent stiffness of a textile sheet material when the latter is wound onto the roller blind shaft, such that the textile sheet material does not fall into the longitudinal slot when wound onto the outer casing.
18. The roller blind shaft according to claim 10, wherein the roller blind shaft is designed as a hollow profile with an inner contour that is star-shaped in cross-section.
Description
[0018] Further features and advantages of the invention emerge from the claims and from the following description of preferred exemplary embodiments of the invention, which are illustrated with reference to the drawings.
[0019] FIG. 1 shows, schematically in a cross-sectional illustration, an embodiment of a roller blind device according to the invention in a cassette housing of a cargo space protection device,
[0020] FIG. 2 shows the embodiment according to FIG. 1 in a three-dimensional sectional illustration,
[0021] FIG. 3 shows the roller blind device according to FIG. 1 in the completely unwound state of a flexible textile sheet material held on the roller blind shaft,
[0022] FIG. 4 shows the roller blind shaft of the roller blind device according to FIGS. 1 to 3 in an enlarged illustration,
[0023] FIGS. 5 to 8 show a further embodiment of a roller blind device according to the invention similar to FIGS. 1 to 4 in different winding stages of the flexible textile sheet material, and
[0024] FIG. 9 shows, schematically, a further embodiment of a roller blind device according to the invention.
[0025] A roller blind device 1 according to FIGS. 1 to 4 is provided for a cargo compartment cover in a station wagon. The roller blind device 1 is integrated in a cassette housing 2 of the cargo compartment cover. The cassette housing 2 has a passage slot 3 in the region of a side wall, through which a flexible textile sheet material 4 of the roller blind device 1 can be pulled out and in. The flexible textile sheet material 4 which, in particular, is configured in the form of a textile web or a plastic film web, is held on a roller blind shaft 5 such that it can be wound up and unwound in a manner described in more detail below. At its opposite front ends, the roller blind shaft 5 is rotatably mounted in the cassette housing 2 in a manner not specifically illustrated. To this end, the cassette housing 2 has in its opposite front end regions corresponding bearing elements, which ensure the rotatable mounting of the roller blind shaft 5 about an axis of rotation D. The flexible textile sheet material 4, which forms a covering web or tarpaulin of the cargo compartment cover, lies flat on an outer casing of the roller blind shaft 5 or on an appropriate winding layer of the textile sheet material 4 over its entire width, which is oriented parallel to the axis of rotation D. The roller blind shaft 5 has a length which is greater than the width of the flexible textile sheet material 4. The flexible textile sheet material 4 is preferably configured as a rectangular blank. The roller blind shaft 5 is at least largely cylindrical. In an embodiment of the invention that is not illustrated, the roller blind shaft widens conically along the axis of rotation. In this embodiment, not illustrated, the blank of the flexible textile sheet material is accordingly also not rectangular but matched to the conical configuration of the roller blind shaft in such a way that a front end region of the flexible textile sheet material that is in front in the pull-out direction remains parallel to the axis of rotation of the roller blind shaft during a pulling-out operation.
[0026] An end region of the flexible textile sheet material 4 that is assigned to the roller blind shaft 5 is configured as an annularly closed loop 6, which encloses the roller blind shaft 5 according to FIG. 3. The end region of the textile sheet material 4 is laid around the roller blind shaft 5 with play. A front edge 7 of the textile sheet material 4 can be seen with reference to FIG. 3. As can likewise be gathered from FIG. 3, an end section of the textile sheet material 4 that adjoins the front edge 7 is doubled with a surface section of the end region of the textile sheet material 4 that is not specifically designated. In these regions lying on one another, the corresponding sections of the textile sheet material 4 are fixed to one another over an entire width of the textile sheet material 4 by means of a fixing seam N. The fixing seam N can be made by sewing the two surface sections or else by welding or adhesive bonding—depending on the material configuration of corresponding surfaces of the textile sheet material 4. The closed annular loop 6 thus formed has a greater diameter than a diameter of the roller blind shaft 5, with the result that, according to the illustration of FIG. 3, when the loop 6 wraps around the roller blind shaft 5 when the textile sheet material 4 is tensioned, play remains on one side between the loop 6 and the roller blind shaft 5.
[0027] To ensure that the loop 6 and the roller blind shaft 5 cannot rotate relative to each other—relative to the axis of rotation D—an adhesive strip 8 which, in the exemplary embodiment illustrated is designed as a double-sided adhesive strip, is provided between the loop 6 and the outer casing of the roller blind shaft 5. The adhesive strip 8 extends over the entire width of the textile sheet material 4 and therefore over virtually the entire length of the roller blind shaft 5. The adhesive strip 8 is additionally bonded flat to a sub-region of the outer casing of the roller blind shaft 5. Its outer surface is bonded to an inner surface section of the loop 6 of the flexible textile sheet material 4. The fixing seam N of the loop 6 is arranged approximately opposite to the arrangement of the adhesive strip 8 in relation to the roller blind shaft 5, with the result that when tensile loads are applied to the textile sheet material 4, substantially radial compressive forces are applied to the adhesive strip 8 from outside by the loop 6. This prevents the adhesive strip 8 creeping or wandering along the outer casing of the roller blind shaft 5 when tensile loads are applied permanently by the textile sheet material 4. Therefore, a permanently active adhesive fixing of the loop 6 to the outer casing of the roller blind shaft 5 can be achieved.
[0028] The fixing seam N extends over the entire width of the textile sheet material 4. With reference to FIG. 3, it can be seen that the fixing seam N also extends in the pull-out direction of the textile sheet material 4 over a certain length which, in FIG. 3, can be seen by the surface sections of the textile sheet material 4 lying flat on one another. Therefore, when sewing, a seam is formed over the entire surface strip. In the same way, the surface strip thus formed is achieved in an integral connection by appropriate flat welding or flat adhesive bonding.
[0029] With reference to FIG. 4, it is easy to see that the roller blind shaft 5—viewed in cross section—has a star-shaped inner contour 14. Therefore, the inner contour of the roller blind shaft 5 is provided with longitudinal grooves or longitudinal profiles distributed in a star shape over the inner circumference, which extend over an entire length of the roller blind shaft 5.
[0030] The outer casing of the roller blind shaft 5 is provided in the area of one half (in FIG. 4 the right-hand drawing half) with hollow profiles 12 extending longitudinally, i.e. parallel to the axis of rotation D, which form material recesses in the sense of the invention. The hollow profiles 12 are radially outwardly open. In the embodiment according to FIG. 4, four identically configured hollow profiles 12 are distributed at uniform intervals over the circumference of the outer casing of the roller blind shaft. These hollow profiles 12 are configured identically to one another.
[0031] In addition, a further, channel-shaped hollow profile 13 is also provided. All the hollow profiles 12, 13 extend over the entire length of the roller blind shaft 5.
[0032] The roller blind shaft 5 is produced from a lightweight metal alloy in an extrusion process, so that the star-shaped inner contour 14 and the hollow profiles 12, 13 are already formed during the production of a corresponding semi-finished product in the form of an extrusion. The roller blind shaft 5 is produced by appropriately cutting the extrusion to length. Outer casing sections 15 of the roller blind shaft 5 in the circumferential direction between the hollow profiles 12, 13 are configured in the form of a cylindrical section and define a cylindrical outer circumference of the outer casing of the roller blind shaft 5 and therefore, in cross section, an outer circular line coaxial with the axis of rotation D.
[0033] The outer casing of the roller blind shaft 5 is provided with radial steps 9 to 11 which are offset in the circumferential direction relative to the cylindrical outer casing sections 15 and which, in cross section, extend on different circular lines with a smaller radius relative to the axis of rotation D than the outer casing sections 15. Each radial offset step extends in the circumferential region over a subregion of the outer casing of the roller blind shaft 5 and in the longitudinal direction over an entire length of the roller blind shaft 5. One section 10 represents a transition step to the radial offset step 9 extending in the circumferential direction. The radial offset step 9 is provided to bond the adhesive strip 8 in the longitudinal direction and along the circumference. The radial offset step 11 is used to accommodate a fold F of the loop 6 of the flexible textile sheet material 4 which is formed when the textile sheet material 4 from the illustration according to FIG. 3 is wound up according to FIGS. 1 and 2. The corresponding radial offset steps 9, 11 reduce the cylindrical outer diameter of the roller blind shaft 5 by the thickness—viewed radially—of the adhesive strip 8 or of the fold F, in order to ensure that the flexible textile sheet material 4 is wound continuously cylindrically and uniformly onto the roller blind shaft 5 despite these sectional thickenings. The arrangement and widening of the textile sheet material 4 relative to the roller blind shaft 5 is illustrated once more in somewhat more detail with reference to the embodiment according to FIGS. 5 to 8. FIGS. 5 to 8 show a roller blind device 1a which is at least largely configured identically to the roller blind device 1 according to FIGS. 1 to 4. To avoid repetitions, for the roller blind device 1a according to FIGS. 5 to 8, reference is made to the explanations relating to the roller blind device 1 according to FIGS. 1 to 4. The single difference in the roller blind device 1a according to FIGS. 5 to 8 is that the hollow profiles in the region of the outer casing of the roller blind 5a are not illustrated, although indicated in FIG. 8, but are designed differently from the hollow profiles 12 and 13 according to FIGS. 1 to 4. In both embodiments according to FIGS. 1 to 8, the hollow profiles are used to achieve a uniform mass distribution over the circumference of the roller blind shaft. Since wall sections of the roller blind shaft 5 or 5a in the region of the radial offset steps 9 to 11 are solid but represent a reduced outer circumference, the oppositely arranged hollow profiles in the region of the greater outer circumference compensate for the corresponding mass differences of the wall of the roller blind shaft 5. The radially outwardly open hollow profiles 12 and 13 are designed in such a way that the flexible textile sheet 4a wound onto the outer casing of the roller blind shaft 5, 5a does not fall into these material recesses. This can easily be seen with reference to FIGS. 1 and 8.
[0034] Both embodiments of the roller blind shaft 1 and the roller blind shaft 1a are provided with the same designations for identical or functionally identical parts or sections but with the addition of the letter a with respect to the roller blind device 1a. The explanations relating to the roller blind device 1 according to FIGS. 1 to 4 apply in the same way to the roller blind device 1a according to FIGS. 5 to 8. In addition, the description of the winding operation of the textile sheet material 4a according to FIGS. 5 to 8 applies in the same way to a winding operation of the textile sheet material 4 in the roller blind device 1 according to FIGS. 1 to 4.
[0035] It can be seen from FIG. 5 that the adhesive strip 8a is at least largely opposite the fixing seam N.sub.a, as long as the textile sheet material 4a is loaded in tension in the direction of the thick arrow in FIG. 5. On the opposite run of the loop, corresponding tensile forces act on the loop 6a, which are indicated by the small arrows in FIG. 5. Given such a tensile loading, virtually exclusively radial compressive forces act on the adhesive strip 8a through the loop 6a, at least over half of the circumferential strip 8a—seen in the circumferential direction of the roller blind shaft 5a. Then, according to FIG. 6, as soon as the loop 6a is folded adjacent to the fixing seam N.sub.a, the result is necessarily the fold F.sub.a, according to FIG. 7. The latter is embedded in the region of a radial offset step 11a. This is adjoined in the circumferential direction by a further radial offset step 9a, on which the adhesive strip 8a is secured. During a further rotation of the roller blind shaft 5a in the counterclockwise direction about the axis of rotation D.sub.a (FIGS. 7 and 8), the textile sheet material 4a is wound uniformly cylindrically onto the roller blind shaft 5a, the fold F.sub.ain conjunction with the fixing seam N.sub.a and the adhesive strip 8a being positioned in the area of the radial offset steps 9a and 11a, which extend approximately over half the circumference of the outer casing of the roller blind shaft 5a (FIG. 8). Since, on the opposite half of the roller blind shaft 5a, the roller blind shaft has thicker walls, material recesses in the form of hollow profiles must also be provided here (FIG. 8), as in the embodiment according to FIGS. 1 to 4, which once more compensate for any mass imbalance that arises.
[0036] In the roller blind device 1b according to FIG. 9, a fixing of the flexible textile sheet material 4b to the roller blind shaft 5b that is different from the roller blind device 1 or 1a according to FIGS. 1 to 8 is provided. The fixing corresponds largely to the securing of the flexible textile sheet material to the roller blind shaft as illustrated in DE 10 2014 207 408 A1. A front end region of the flexible textile sheet material 4b in the roller blind device 1b is firmly connected to a web section 16 which is curved in the form of a circular arc in cross-sectional profile and which is integrated into a hollow space 17 of the roller blind shaft 5b which is likewise curved in the form of a circular arc in cross section. The web-like holding strip 16 is preferably pushed axially into the hollow space 17. The hollow space 17, and also the roller blind shaft 5b overall, is open toward both front end faces. The roller blind shaft 5b is produced in a way analogous to the previously described embodiments as a hollow extruded profile made of a lightweight metal alloy. The hollow space 17 is radially outwardly open via a longitudinal slot, which is positioned approximately centrally relative to the hollow space 17. An outer casing of the roller blind shaft 5b in the region of this radial longitudinal slot forms a radial offset step 18, as can be gathered from FIG. 9. In order to be able to compensate for wall thickenings in the region of the hollow space 17 of the wall of the roller blind shaft 5b, the wall of the roller blind shaft 5b configured as a hollow profile offset in the circumferential direction relative to the hollow space 17 and the radial longitudinal slot is provided with radially outwardly open hollow profiles 12b. An inner contour of the roller blind shaft 5b is profiled in a star shape in cross section coaxially to an axis of rotation, not shown, of the roller blind shaft 5b, forming the star-shaped inner contour 14b. As distinct from the roller blind shaft 5 and 5a according to FIGS. 1 to 8, the star shape of the inner contour is not distributed uniformly over the entire inner circumference of the roller blind shaft 5b, however; instead the inner contour 14b extends only over the region of the inner circumference of the roller blind shaft 5b which is offset in the circumferential direction relative to the hollow space 17 of the roller blind shaft 5b. In the region of the circular arc-shaped hollow space 17b, the inner contour of the roller blind shaft 5b is configured in the manner of a cylindrical section.
[0037] The radial offset step 18 is matched to a thickness of a winding layer of the textile sheet material 4b, in order to be able to achieve uniform cylindrical winding of the textile sheet material 4b on the roller blind shaft 5b.
