Winding device for use on a sun protection device

Abstract

The invention relates to a winding device (01) for use on a sun protection device, wherein the winding device (01) comprises a hollow winding shaft (02) onto which a sun protection curtain can be wound, and wherein a support element (06) is arranged inside the winding shaft (01) which is mounted non-rotatably on at least one side, on which the winding shaft (02) is rotatably mounted with rotary bearings (07), and wherein the support element (06) has a neutral bending fiber which runs parallel to the longitudinal axis of the winding shaft (02), wherein a tension or compression element (08) is provided on or in the support element (06) which extends at least partially outside the neutral bending fiber of the support element (06), and wherein the tension or compression element (08) can be clamped under tension or compression between two end pieces (09, 10) attached to the support element (06).

Description

[0001] The invention relates to a winding device for use on a sun protection device according to the preamble of claim 1.

[0002] Winding devices of this type are used primarily, but by no means exclusively, for winding up the sun protection curtain on roller blinds. With these roller blinds, the usually textile sun protection curtain is unwound vertically downwards to reduce solar radiation through a window. The sun protection curtain can be mounted either on the outside or inside of the window.

[0003] Depending on the width of the winding device, which is usually essentially the width of the window, the hollow winding shaft onto which the sun protection curtain is wound will bend. The longer the winding shaft, the greater the undesirable deflection of the winding shaft. In conventional winding devices, this undesirable deflection is counteracted by the use of correspondingly stiff winding shafts. The disadvantage of these highly rigid winding shafts, however, is that they are either very expensive to produce, for example from carbon fiber reinforced plastic, or very heavy, as is the case with aluminum winding shafts.

[0004] WO 2020 / 089220 A1 also discloses a further solution for preventing undesired deflection on the winding shaft of a winding device of this type. The winding device described therein uses a support element that is arranged inside the winding shaft and is mounted in a rotationally fixed manner on at least one long side. The winding shaft itself is rotatably mounted on this support element by means of pivot bearings. To compensate for the undesired weight deflection of the winding shaft, the support element is plastically deformed before being inserted into the winding shaft. The resulting plastic deflection of the support element ensures that the winding shaft is also deformed in the corresponding direction after the support element has been inserted into the winding shaft, thereby compensating for the deformation induced by the weight load.Due to the rotationally fixed mounting of the support element, the deformation of the winding shaft induced by the deflection of the support element acts essentially exactly vertically upwards and thus counteracts the vertically downward, weight-induced deflection.

[0005] According to DE 848 700 C, it is proposed that a strip-shaped stiffening element be arranged between two central spring housings on the underside of a support shaft, the ends of which are firmly connected to the support shaft as close as possible to the spring housings, and a turnbuckle is arranged in the central section between the support shaft and the stiffening element. The disadvantage is that the turnbuckle and the stiffening element remain visible and accessible even after assembly, which undesirably detracts from the overall aesthetic appearance.

[0006] A disadvantage of the winding devices known from WO 2020 / 089220 A1 and DE 848 700 C is that they are very difficult to install. Due to the plastic deformation of the support element and the resulting deflection of the support element, the support element can no longer be easily inserted into the hollow winding shaft. Instead, large forces must be applied to insert the bent support element into the undeformed hollow winding shaft. Furthermore, the extent of the deflection induced by the deflection, which is intended to compensate for the deflection induced by the weight force, is subject to very high error tolerances. For example, the deflection induced by the deflection fluctuates greatly with temperature, since the stiffness of the material from which the support element is made, for example, aluminum, is highly dependent on the respective temperature.In addition, undesirable creep processes may occur in the material of the support element, so that the deflection induced by the deformation of the support element varies with temperature.

[0007] Based on this prior art, it is therefore an object of the present invention to propose a new winding device for use on a sun protection device which avoids the disadvantages described above.

[0008] This object is achieved by means of a winding device according to the teaching of claim 1.

[0009] Advantageous embodiments of the invention are the subject of the subclaims.

[0010] The winding device according to the invention is based on the basic idea that a tension or compression element is provided on or in the rotationally fixed support element, which extends at least partially outside the neutral bending fiber of the support element. The tension or compression element can be clamped under tension or compression between two end pieces attached to the support element. Due to the arrangement of the tension or compression element outside the neutral bending fiber, the clamping of the tension or compression element under tension or compression induces a supporting effect of the support element. Due to the rotationally fixed mounting of the support element, the supporting effect of the support element does not change even when the winding shaft rotates. Instead, the support element bends in a very specific direction, in particular vertically upwards, due to the tensile or compressive load exerted by the tension or compression element.This vertically upward supporting effect of the support element can then compensate for the vertically downward deflection of the hollow winding shaft. Since the supporting effect induced by the tension or compression element only occurs when the tension or compression load is applied by clamping the tension or compression element between the support elements, the support element can be easily installed in the hollow winding shaft. As a result, load-free deflection of the support element does not occur.

[0011] The degree of weight-induced deflection of the hollow winding shaft in the winding device can be influenced by a variety of factors. The length of the winding shaft and the weight of the sun protection curtain in particular have a significant impact on the degree of deflection. In order to be able to flexibly adapt the compensation of the deflection through the supporting effect of the tension or compression element to a wide variety of boundary conditions, an adjustment element is provided between at least one end piece on the support element on the one hand and the tension or compression element on the other. The adjustment element is used to change the length of the tension or compression element or the clamping length between the end bearings. By changing the length of the tension or compression element or the clamping length between the end bearings, the degree of tensile or compressive loading of the support element can be changed within a wide adjustment range, so that the support element can be adjusted accordingly.This vertically upward deflection of the support element then, depending on the setting, exactly compensates for the vertically downward, weight-induced deflection of the winding shaft, so that as a result, both the winding shaft and the support element no longer exhibit any geometric deflection, but instead exhibit a largely vertical course.

[0012] The type of tension or compression element used to apply the tensile or compressive load to the support element is fundamentally arbitrary. According to a first preferred embodiment, a compression rod is used for this purpose.

[0013] If the tension or compression element is designed as a push rod, it should preferably be positioned above the neutral bending axis of the support element. This allows the downward, weight-induced deflection of the hollow winding shaft to be compensated for by the load-induced support effect of the support element.

[0014] As an alternative to using a push rod, a pull rope can also be installed in the support element as a tension or compression element.

[0015] When using a traction cable, it should preferably be arranged below the neutral bending fiber of the support element in order to compensate for the weight-induced support effect of the winding shaft through the load-induced deflection of the support element.

[0016] The type of adjustment element used to adjust the length of the tension or compression element, or the clamping length between the end bearings, is fundamentally arbitrary. A particularly simple adjustment element can be designed as an adjustment screw. This adjustment screw can then be directly or indirectly attached to the end face of the compression rod and, when screwed in, induce a compressive load in the compression rod.

[0017] Furthermore, it is particularly advantageous if the support element has a polygonal cross-section.

[0018] Due to the polygonal cross-section, the elastic deformation of the support element due to tensile or compressive loads can be particularly well adapted to the respective boundary conditions.

[0019] From a design perspective, it is particularly advantageous to provide a profile section on the top side of the support element, outside the neutral bending fiber, in which the tension or compression element is accommodated. This profile section allows the tension or compression element to be mounted in a rotationally fixed manner within the support element, preventing it from twisting even under load, for example, when adjusting the pressure using an adjusting screw.

[0020] Furthermore, it is advantageous if the support element is formed by a hollow profile, with a plug-in profile arranged inside the hollow profile. A profile section for receiving the tension or compression element is then formed between the outer side of the plug-in profile and the inner side of the hollow profile.

[0021] The method by which the winding device for unwinding or rewinding the sun protection curtain is driven is fundamentally arbitrary. This drive can also be implemented using a manually operated drive mechanism, such as a pull chain.

[0022] However, with regard to the convenience of operating the winding device, it is particularly advantageous if a drive motor is arranged in the winding shaft next to the support element, with which the winding shaft can be driven in rotation.

[0023] To attach the winding device to a ceiling or wall, it is particularly advantageous if the winding device can be attached between two wall fastening elements.

[0024] To ensure the support element is non-rotatably mounted, it can be easily connected to one of the two wall fastening elements.

[0025] With regard to the necessary length compensation between the distance between the two wall fastening elements on the one hand and the length of the winding device on the other hand, it is advantageous if the support element is axially spring-mounted on at least one wall fastening element.

[0026] The type of sun protection device for which the winding device according to the invention is used is basically arbitrary.

[0027] The use of the winding device according to the invention is particularly advantageous for sun protection roller blinds which are attached to the winding shaft of a sun protection curtain which can be unwound vertically downwards by rotating the winding shaft.

[0028] Alternatively, the winding device according to the invention can also be used for sun protection awnings in which the sun protection curtain is rolled out to the side.

[0029] An embodiment of the invention is shown schematically in the drawings and is explained below by way of example.

[0030] They show: Fig. 1 a winding device according to the invention in a perspective side view; Fig. 2 the polygonal support element of the winding device according to Fig. 1 in perspective side view; Fig. 3 the winding device according to Fig. 1 in longitudinal section; Fig. 4 the winding device according to Fig. 3 in an enlarged section of the longitudinal section.

[0031] Fig. 1 shows a winding device 01 with a hollow winding shaft 02, on which a Fig. 1 not shown sun protection curtain can be wound up. The winding shaft 02 is rotatably mounted between two wall fastening elements 03 and 04 and can be driven by a drive motor 05 arranged inside the winding shaft 02 (see Fig. 3 ) are motor-driven.

[0032] Fig. 2 shows a support element 06 with a polygonal cross-section, which is mounted inside the hollow winding shaft 02 and can be connected in a rotationally fixed manner to the left wall fastening element 03. Several pivot bearings 07 are mounted on the outer circumference of the support element 06, on which the hollow winding shaft 02 is rotatably mounted in order to realize a rotation of the winding shaft 02 relative to the rotationally fixed support element 06.

[0033] Fig. 3 shows the winding device 01 in longitudinal section. The winding shaft 02, the wall fastening elements 03 and 04, the drive motor 05, the support element 06 and the pivot bearings 07 can be seen. A pressure element 08, which is designed in the manner of a pressure rod, is arranged inside the support element 06. The pressure element 08 can be clamped under pressure between two end pieces 09 and 10, which are fixed inside the support element 06, in order to induce an upward supporting effect of the support element. This supporting effect of the support element points vertically upwards and counteracts the weight-induced deflection of the winding shaft 02. The structure and function of the pressure element 08 are explained below with reference to the illustration in Fig. 4 explained in more detail.

[0034] Fig. 4shows the longitudinal section through the winding device 01 in an enlarged detail in the area of ​​the wall fastening element 03. The pressure element 08 can be seen inside the support element 06. The pressure element 08, designed as a pressure rod, can be pressurized by means of an adjusting screw 11. Due to the arrangement of the pressure element 08 outside the neutral bending fiber of the support element 06, the pressure load induces an upward supporting effect of the support element, which counteracts the weight-induced deflection of the winding shaft 02, so that the undesired deflection is ultimately compensated. The pressure element 08 is mounted inside the hollow support element 06 by an insert profile 12, which is inserted into the support element 06 designed as a hollow profile. The wall fastening element 03 is arranged in an axially spring-loaded manner at the left end of the winding shaft 02 in order to achieve length compensation during wall fastening.

Claims

1. A winding device (01) for being used on a sun protection device, the winding device (01) comprising a hollow winding shaft (02) on which a sun protection blind is capable of being wound, a support element (06) which is mounted at least on one side in a rotationally fixed manner and on which the winding shaft (02) is rotatably mounted by means of pivot bearings (07) being disposed inside the winding shaft (02), and the support element (06) having a neutral bending fibre running parallel to the longitudinal axis of the winding shaft (02), characterised in that a traction or pressure member (08) is provided on or in the support element (06), at least a section of said traction or pressure member (08) running outside the neutral bending fibre of the support element (06), the traction or pressure member (08) being capable of being clamped under traction or pressure between two end pieces (09, 10) fixed on the support element (06), an adjusting element being provided between at least one end piece (09) on the support element (06) on the one hand and the traction or pressure member (08) on the other hand, the length of the traction or pressure member (08) or the clamping length between the end bearings (09, 10) being changeable by means of said adjusting element.

2. The winding device according to claim 1, characterised in that the traction or pressure member (08) is realised in the manner of a pressure bar.

3. The winding device according to claim 2, characterised in that the pressure bar is disposed above the neutral bending fibre of the support element (06).

4. The winding device according to claim 1, characterised in that the traction or pressure member is realised in the manner of a traction rope.

5. The winding device according to claim 4, characterised in that the traction rope is disposed below the neutral bending fibre of the support element.

6. The winding device according to any one of claims 1 to 5, characterised in that the adjusting element is realised in the manner of an adjusting screw (11) which is able to come to rest indirectly or directly on the end side of the pressure bar (08).

7. The winding device according to any one of claims 1 to 6, characterised in that the support element (06) has a polygonal cross section.

8. The winding device according to any one of claims 1 to 7, characterised in that a profile section is provided on the top of the support element (06) outside the neutral bending fibre, the traction or pressure member (08) being received in said profile section.

9. The winding device according to any one of claims 1 to 8, characterised in that the support element (06) is realised by a hollow profile, an insertion profile (12) being disposed inside the hollow profile and the profile section being realized between the outside of the insertion profile (12) and the inside of the hollow profile in order to receive the traction or pressure member (08).

10. The winding device according to any one of claims 1 to 9, characterised in that a drive motor (05) by means of which the winding shaft (02) is drivable in a rotary manner is disposed in the winding shaft (02) next to the support element (06).

11. The winding device according to any one of claims 1 to 10, characterised in that the winding device (01) is fixable between two wall mounting elements (09, 10) on a wall.

12. The winding device according to any one of claims 1 to 11, characterised in that the support element (06) is connected in a rotationally fixed manner to at least one wall mounting element (09).

13. The winding device according to any one of claims 1 to 12, characterised in that the support element is mounted in an axially resilient manner on at least one wall mounting element (09).

14. The winding device according to any one of claims 1 to 13, characterised in that the sun protection blind fixed to the winding shaft (02) is capable of being unwound vertically downward as a roller blind and / or in that the sun protection blind fixed to the winding shaft (02) is capable of being unwound laterally as an awning.

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