Shading device with a winding shaft

Abstract

In a shading system (10) with a winding shaft (1), with a curtain that can be wound onto the winding shaft (11) and unwound from the winding shaft (11), with a threaded spindle, with a spindle nut (14, 42) that interacts with the threaded spindle, and with a stop (28) for the spindle nut (14, 42) for limiting the winding movement and / or the unwinding movement of the winding shaft (11), lower manufacturing costs and lower storage costs can be achieved by the threaded spindle being a cross spindle (13) with a cross thread (26).

Description

[0001] The invention relates to a shading system with a winding shaft, with a curtain that can be wound onto the winding shaft and unwound from the winding shaft, with a threaded spindle, with a spindle nut that interacts with the threaded spindle, and with a stop for the spindle nut for limiting the winding movement and / or the unwinding movement of the winding shaft.

[0002] The document DE 10 2006 052 969 A1 shows such a shading system.

[0003] In such shading systems, the threaded spindle is one of the most complex parts to manufacture. A particular disadvantage is that different threaded spindles are required for different applications. This applies, for example, to limiting the winding movement, the unwinding movement, and the installation of any drive on the right or left.

[0004] The problem underlying the invention is to reduce the manufacturing costs and the storage costs for a shading system that can be used in many different ways.

[0005] The problem is solved in a shading system of the type mentioned above by the fact that the threaded spindle is a cross spindle with a cross thread.

[0006] Such a cross thread has threaded sections for both directions of rotation, allowing it to serve as both a right-hand and a left-hand thread. This type of cross spindle can therefore be used for both a winding stop and an unwinding stop. Furthermore, it can be used on both sides of the shading system. Therefore, a separate threaded spindle is not required for each of these applications; one design is sufficient for all these applications, both during production and during storage.

[0007] A further development of the invention is characterized by the fact that the cross thread is an external thread and the spindle nut has an internal thread. This results in a compact and robust design. Preferably, the internal thread of the spindle nut has multiple starts. This achieves good stability with a low tilting moment.

[0008] In another embodiment, it is advantageous for the cross spindle to be designed as a cylindrical sleeve. This enables a compact structure concentric with the winding shaft. The cross spindle can have at least one groove. Such a groove can provide both guidance and a rotationally fixed connection. Preferably, two grooves are provided. This allows greater stability to be achieved. In particular, the two grooves can be provided on opposite long sides of the cross spindle. This allows good force distribution without the occurrence of a tilting moment. The groove can, in particular, run lengthwise. In this way, it can serve as a guide for the spindle nut. If the groove is designed as a longitudinal slot, a simple and lightweight structure results. The longitudinal slot can remain open at one long end, allowing a certain amount of springback. This facilitates assembly., If the longitudinal slot has locking hooks at its open longitudinal end, an element inserted into the longitudinal slot can be securely locked for fastening.

[0009] Another advantage of the invention is that the spindle nut is constructed in multiple parts. This allows the spindle nut to be assembled during assembly. This avoids assembly errors. The multiple parts can be easily connected to one another using a form-fitting, force-fitting, or material-fitting connection. A simple connection is achieved when the parts can be locked together. This is easily achieved when the parts have locking lugs. A particularly simple design is achieved when the spindle nut is constructed in two parts, with the two parts being approximately semicircular.

[0010] In another embodiment, the spindle nut can be selected from a multi-part set of prefabricated spindle nuts. This simplifies assembly. With a suitable design of the spindle nuts, it may be sufficient to provide a two-part set of spindle nuts. This results in lower storage costs. Spindle nuts with left-hand and / or right-hand threads are preferably provided. However, it is also possible to provide only a single type of spindle nut. In this case, the spindle nut can also have a cross-thread or, instead of a thread, at least one projection with a small extension. An actuator can then be used to switch from right-hand to left-hand and vice versa. Such an actuator can either be inserted into the respective spindle nut to create a right-hand or left-hand spindle nut. However, a switchable actuator can also be used.Such an actuator can be, for example, a pin that can be inserted into various openings or recesses or moved in its position.

[0011] Another embodiment of the invention features a stiffening element for the cross spindle. This allows the cross spindle to be manufactured relatively light and with thin walls. This facilitates the manufacture of the cross spindle. It is advantageous if the stiffening element has ribs. This results in good stability with minimal material consumption. The ribs can be circular. A stiffening element with such a structure is easy to manufacture and install. For example, the stiffening element can be manufactured in one piece with the ribs.

[0012] In a further development, it is also advantageous if the stiffening element has at least one projection. This facilitates assembly and fastening on or in the cross spindle. It is advantageous if two outer projections are provided. These enable a more secure connection. The outer projections can be provided on the outer sides of the stiffening element. They can thus interact well in the embodiment in which the cross spindle has a groove or a longitudinal slot. The outer projections can be provided on outer sides facing away from one another. This results in high stability. Alternatively or additionally, two inner projections can also be provided. These inner projections enable rotationally fixed assembly of the stiffening element. In an advantageous development, the two inner projections are provided on the inner sides of the stiffening element. This results in high stability.This applies particularly if the inner projections are provided on opposite inner sides of the stiffening element.

[0013] An advantageous embodiment is characterized by the projection being elongated. This results in high stability. The projection can run along the longitudinal direction of the stiffening element. This enables longitudinal guidance as well as simple assembly by plugging them together in the longitudinal direction. It is also possible for the projection to extend as an outer projection over the entire longitudinal outer side of the stiffening element.

[0014] It is also advantageous if the projection is designed to interact with the groove of the cross spindle. In this way, the stiffening element and cross spindle can be connected to one another in a rotationally fixed manner. Particular advantages arise when the groove is designed as a longitudinal slot. In this case, the projection can be pushed into the longitudinal slot for assembly and at the same time penetrate the longitudinal slot to the outside to interact with the spindle nut. If the projection has locking hooks, locking is easy. It is also advantageous if the locking hooks of the projection are designed to interact with the locking hooks of the cross spindle. In this way, the projection can be locked in place during assembly simply by locking it into the longitudinal slot. Further advantages arise if the locking hooks are assigned to one end of the stiffening element in the elongated version of the projection.The stiffening element can be pushed into the cross spindle and locked in this position by means of a locking mechanism.

[0015] In another embodiment, the stop is arranged on the stiffening element. Due to the stability of the stiffening element, this results in a stable and robust stop. The stop can be made in one piece with the stiffening element. This results in a simple and robust construction. However, it is also possible to connect the stop to the stiffening element in a form-fitting, friction-fitting, or force-fitting manner. This results in a high degree of flexibility in production and in the choice of material for the stop. It is also advantageous if the stop is arranged on the end of the stiffening element facing away from the locking hooks. This allows for stable mounting of the stop on the stiffening element. It is also advantageous if the stop is impact-resistant, in particular made of an impact-resistant material. In this way, the stop can withstand high forces when struck without tearing.

[0016] A further development of the invention is characterized by a base profile for holding the cross spindle. This base profile enables a simple and reliable assembly. It is advantageous if the base profile is elongated. This allows the base profile to be easily attached to lateral holders. Furthermore, the base profile can run concentrically to the winding shaft and in its longitudinal direction. This enables a simple assembly.

[0017] It is also advantageous if the base profile has at least one longitudinal groove. This longitudinal groove allows the cross spindle to be attached to the base profile in a rotationally fixed manner. It is also advantageous if the base profile has two longitudinal grooves. This results in increased torsional rigidity. The two longitudinal grooves can be provided on opposite longitudinal sides. This prevents projections that interact with the longitudinal grooves from slipping out of the longitudinal grooves due to deflection. It has also proven advantageous if the longitudinal grooves are designed to interact with the inner projections. This results in a compact and stable structure.

[0018] An embodiment of the invention is explained in more detail below with reference to the figures. They show: Fig. 1Parts of a shading system in an exploded view as an embodiment with the features of the invention, Fig. 2a cross spindle arranged on a base profile with spindle nut arranged thereon of Fig. 1 in a perspective view, Fig. 3 the spindle nut of Fig. 2 in assembled and disassembled state in a perspective view, Fig. 4 another spindle nut in a view similar Fig. 3 , Fig. 5the cross spindle of Fig. 2 in a perspective view, a side view and a top view, Fig. 6 a stiffening element for the cross spindle in a view similar Fig. 5 , and Fig. 7 a representation of the end faces of the stiffening element.

[0019] Fig. 1shows parts of a shading system 10 in an exploded view as an exemplary embodiment with the features of the invention. As can be seen from the figure, the shading system 10 has a cylindrical winding shaft 11 for winding and unwinding a curtain, which is not shown in the figure for clarity.

[0020] Furthermore, an elongated base profile 12 is shown, on which a threaded spindle 13 is arranged. The base profile 12 is made of a suitable metal and has two longitudinal grooves on opposite longitudinal sides, which are not provided with a reference symbol in the figure, as will be explained in more detail below. In the illustrated embodiment, the threaded spindle 13 has a cross thread, as will be explained in more detail below, and is thus designed as a cross spindle 13.

[0021] A spindle nut 14 is arranged on the cross spindle 13. Adjacent to the spindle nut 14, an adapter 15 is mounted on the base profile 12. A bearing 16 is arranged on the adapter.

[0022] As can be further seen from the figure, the shading system 10 also has a bracket 17. The bracket 17 serves to attach the shading system 10 to a wall, lintel, or ceiling not shown in the figure. The bracket 17 has a bearing 18 on its side facing the bearing 16. The bearing 18 is rotatably mounted on the bracket 17.

[0023] Furthermore, the bearing 16 has a receptacle 19 facing the bearing 18. The receptacle 19 is assigned to the bearing 18 and is pushed onto the bearing 18 for assembly. Furthermore, the bearing 16 has two axially extending webs 20 on its outer circumferential surface, of which only one web 20 is visible in the figure.

[0024] Associated with the webs 20, the winding shaft 11 has two grooves 21 arranged facing one another on its inner circumference, which also extend axially. The grooves 21 are formed by two webs 22 arranged adjacent to the grooves 21. The webs 22 also extend axially in the longitudinal direction of the winding shaft 11. Associated with the webs 22, the spindle nut 14 has two recesses 23 facing away from one another on its outer circumference, of which only one recess 23 is visible in the figure.

[0025] In the assembled state, the winding shaft 11 is pushed over the base profile 12 onto the spindle nut 14 and the bearing 16 in such a way that the webs 22 engage in pairs in a recess 23 and that the webs 20 are arranged in the respective associated grooves 21. In this way, the winding shaft 11 is connected in a rotationally fixed manner to the spindle nut 14 and the bearing 16. The bearing 16, in turn, is pushed onto the bearing 18 with its holder 19 in the assembled state. The winding shaft 11 is thus rotatably arranged on the holder 17. When the winding shaft 11 rotates, the spindle nut 14, which is connected in a rotationally fixed manner to it, is screwed over the cross spindle 13.

[0026] Fig. 2 shows the cross spindle 13 arranged on the base profile 12 with the spindle nut 14 arranged thereon of Fig. 1in a perspective view. As can be seen from the figure, the base profile has several webs 24 on its outer circumference extending axially in the longitudinal direction of the base profile 12. For the sake of clarity, only one of the webs 24 is provided with a reference symbol. The webs 24 are evenly distributed over the circumference of the base profile 12. A groove 25 is formed between each two adjacent webs 24. Here, too, for the sake of clarity, only one groove 25 is provided with a reference symbol.

[0027] On its outer circumference, the cross spindle 13 has a cross thread 26. The cross thread 26 is designed as an external thread and has an overlap of left-hand and right-hand thread components. This allows a spindle nut with a left-hand thread to interact with the left-hand thread components, and a spindle nut with a right-hand thread to interact with the right-hand thread components.

[0028] As can be further seen from the figure, the cross spindle 13 has a longitudinal slot 37 on its outer circumferential surface. The cross spindle has a total of two longitudinal slots 37 on opposite sides, of which only one longitudinal slot 37 is visible in the figure. The longitudinal slots 37 are open at their ends facing away from the adapter 15.

[0029] A projection 27 of a stiffening element, not visible in the figure, is arranged in the longitudinal slot 37 and will be discussed in more detail below. The projection 27 extends in the longitudinal direction of the cross spindle 13 and has a stop 28 for the spindle nut 14 at its end facing the adapter 15. At its longitudinal end facing away from the stop 28, the projection 27 has locking hooks 29. In the embodiment shown, the projection 27 has two locking hooks 29 that are wedge-shaped and extend laterally from the projection 27.

[0030] The locking hooks 29 are associated with locking hooks 30 on the longitudinal slot 37. The locking hooks 29, 30 locking together ensures a secure fit of the projection 27 in the longitudinal slot 37.

[0031] As can also be seen from the figure, the spindle nut 14 is constructed in several parts. In the exemplary embodiment shown, the spindle nut 14 is in two parts and has a first spindle nut part 31 and a second spindle nut part 32. The first spindle nut part 31 and the second spindle nut part 32 each have corresponding locking lugs 33, 34. By means of the locking lugs 33, 34, the first spindle nut part 31 and the second spindle nut part 32 can be locked together to form the spindle nut 14. In the exemplary embodiment shown, the spindle nut 14 has a right-hand thread and, when rotated counterclockwise or mathematically negatively in the figure, to the right, moves away from the adapter 15.When rotating counterclockwise against the cross thread 26, or mathematically positive, the spindle nut 14 moves to the left in the figure, toward the adapter 15, until the spindle nut 14 strikes the stop 28 in the state shown in the figure. For this purpose, the spindle nut 14 has a stop 38, which, in the state shown, strikes the stop 28. In the illustrated embodiment, each spindle nut part 31, 32 has a stop 38, although only one stop 38 is visible in the figure, namely the stop 38 of the first spindle nut part 31.

[0032] The Fig. 2It can also be seen that the adapter 15 has a receptacle 35. In the embodiment shown, the receptacle 35 extends through the entire adapter 15 and serves to hold the base profile 12. For this purpose, the receptacle 35 has grooves 39 corresponding to the webs 24 and webs 40 corresponding to the grooves 25. For better clarity, only one groove 39 and one web 40 are provided with a reference numeral. To secure the adapter 15 to the base profile 12, the adapter 15 has two screws 36. There is no web 40 in the area of the screws 36.

[0033] At its end facing away from the base profile 12 in the figure, the receptacle 35 can serve to receive a correspondingly contoured pin (not shown in the figure). Such a pin can, for example, protrude from the bearing 18 and be non-rotatably attached to the holder. This pin can then form a pivot bearing for the bearing 18 and simultaneously ensure non-rotatable mounting of the base profile.

[0034] Fig. 3 shows the spindle nut 14 of Fig. 2 in assembled and disassembled state in a perspective view. On the left in the figure, the spindle nut 14 is shown in its assembled state. On the right, the first spindle nut part 31 and the second spindle nut part 32 can be seen in their disassembled state.

[0035] As can be seen from the figure, the first spindle nut part 31 has two stops 38 on axially opposite sides. Furthermore, the first spindle nut part 31 has a thread 41. In the illustrated embodiment, the thread 41 is an internal thread. Furthermore, the thread 41 is designed as a right-hand thread. Furthermore, the thread 41 has multiple starts.

[0036] As can also be seen from the figure, the second spindle nut part 32 is designed similarly to the first spindle nut part 31. Specifically, the second spindle nut part 32 also has two stops 38 on axially opposite sides and the multi-start right-hand thread 41, designed as an internal thread. The locking lugs 33, 34 are also constructed identically. Specifically, the first spindle nut part 31 and the second spindle nut part 32 are identical. This means that only one type of spindle nut part needs to be manufactured and kept in stock. During assembly, two identical spindle nut parts are then connected to each other.

[0037] Fig. 4 shows another spindle nut 42 in a representation similar Fig. 3. Essentially, the spindle nut 42 corresponds to the spindle nut 14. Identical elements have the same reference numerals. In contrast to the spindle nut 14, the spindle nut 42 has a first spindle nut part 43 and a second spindle nut part 44, stops 45 and a thread 46, which is also designed as an internal thread, in the embodiment shown as a multi-start left-hand thread. The stops 45 correspond to the stops 38, but in contrast to the latter, due to the opposite direction of rotation of the thread 46, they are aligned opposite to the stops 38. As with the first spindle nut part 31 and the second spindle nut part 32, the first spindle nut part 43 and the second spindle nut part 44 are also the same.

[0038] Fig. 5 shows the cross spindle 13 of Fig. 2in a perspective view, a side view, and a top view. The cross spindle 13 is shown in perspective at the top of the figure, in the middle in a side view, and at the bottom in a top view.

[0039] As can be seen from the perspective view, the longitudinal slot 37 is open at one of its longitudinal ends. The locking hooks 30 are arranged at the open longitudinal end. At the longitudinal end facing away from the locking hooks, the longitudinal slot 37 is closed at the front. In this area, the cross spindle 13 has an opening 47 at the front for the base profile 12.

[0040] In the side view, it can be seen that the individual threads of the cross thread 26 have a roughly convex contour. They are wider in the middle area and taper towards the respective ends. The individual threads are designed such that, coming from one end, a portion of a thread initially has one direction of rotation, for example, right-handed. Towards the middle, the direction of rotation then changes, in this case to left-handed, and the adjacent threaded section continues for the right-handed thread, and vice versa.

[0041] Fig. 6 shows a stiffening element 48 for the cross spindle 13 in a representation similar Fig. 5. In the figure above, the stiffening element 48 is shown in a perspective view, in the middle in a side view, and below in a top view. As can be seen from the figure, the stiffening element 48 has the projection 27, the stop 28, and the locking hooks 29. In addition, the stiffening element has several ribs 49, of which only one rib 49 is provided with a reference symbol in the figure.

[0042] In the illustrated embodiment, the ribs 49 are circular in shape with a central opening 51 for the base profile 12. As can be seen particularly from the side view, two similar projections 27 are provided on opposite longitudinal sides of the stiffening element. Each projection has a stop 28 and locking hooks 29. In the illustrated embodiment, the stop 28 and the locking hooks 29 are each formed integrally with the respective projection 27. Likewise, the projections 27 and the ribs 49 are also formed integrally with the stiffening element 48.

[0043] The figure also shows that a projection 50 is provided below each stop, directed radially inward. The two projections 50 are arranged facing each other. The projections 50 each serve to engage a groove 25 of the base profile 12. Through the interaction of the projection 50 and the respective associated groove 25, the stiffening element 48 can be arranged in a rotationally fixed manner on the base profile 12. Through the interaction of the projection 27 and the longitudinal slot 37, the cross spindle 13 is also arranged in a rotationally fixed manner on the base profile 12.

[0044] Fig. 7 shows a representation of the end faces 52, 53 of the stiffening element 48. At the top of the figure, the end face 52 associated with the stops 28 and the projections 50 can be seen. Fig. 6 seen from the left. Below in Fig. 7 the end face 53 associated with the locking hooks 29 is shown, in which Fig. 6Viewed from the right. As can be seen from the figure, the projections 50 project radially inward to engage a groove 25 of the base shaft 12. List of reference symbols:

[0045] 10 Shading system 32 second spindle nut part 11 winding shaft 33 locking lug 12 Basic profile 34 locking lug 13 Cross spindle 35 Recording 14 spindle nut 36 screw 15 adapter 37 Longitudinal slot 16 warehouse 38 stop 17 holder 39 Nut 18 warehouse 40 web 19 Recording 41 Right-hand thread 20 web 42 spindle nut 21 Nut 43 first spindle nut part 22 web 44 second spindle nut part 23 recess 45 stop 24 web 46 internal thread 25 Nut 47 opening 26 Cross thread 48 stiffening element 27 projection 49 rib 28 stop 50 projection 29 locking hook 51 opening 30 locking hook 52 front side 31 first spindle nut part 53 front side

Claims

1. Shading system with a winding shaft (11), with a curtain that can be wound onto the winding shaft (11) and unwound from the winding shaft (11), with a threaded spindle, with a spindle nut (14, 42) cooperating with the threaded spindle, and with a stop (28) for the spindle nut (14, 42) for limiting the winding movement and / or the unwinding movement of the winding shaft (11), characterized in that the threaded spindle is a cross spindle (13) with a cross thread (26).

2. Shading system according to claim 1, characterized in that the cross thread (26) is an external thread, and that the spindle nut (14, 42) has a preferably multi-start internal thread.

3. Shading system according to claim 2 or 3, characterized in thatthe cross spindle (13) is designed as a cylindrical sleeve, wherein the cross spindle (13) preferably has at least one groove, preferably two grooves, in particular on longitudinal sides facing away from one another, which in particular runs longitudinally, particularly preferably is designed as a longitudinal slot (37), and that preferably the longitudinal slot (37) is open at one longitudinal end, and that in particular the longitudinal slot (37) has locking hooks (30) at its open longitudinal end.

4. Shading system according to one of the preceding claims, characterized in that the spindle nut (14, 42) is designed in several parts, wherein the plurality, in particular two, spindle nut parts (31, 32, 43, 44) can preferably be connected to one another in a form-fitting, force-fitting or material-fitting manner, in particular can be locked, and particularly preferably have locking lugs (33, 34).

5. Shading system according to one of the preceding claims, characterized in thatthe spindle nut (14, 42) can be selected from a multi-part, in particular two-part, set of prefabricated spindle nuts (14, 42), preferably with left-hand thread and / or right-hand thread 6. Shading system according to one of the preceding claims, characterized by a stiffening element (48) for the cross spindle (13), which preferably has ribs (49) which are in particular circular in shape.

7. Shading system claim 6, characterized in that the stiffening element (48) has at least one projection (27, 50), wherein in particular two outer projections (27) are provided, preferably on outer sides, in particular facing away from one another, and / or two inner projections (50) are provided, preferably on inner sides, in particular facing one another.

8. Shading system according to claim 7, characterized in thatthe projection (27) is elongated, in particular along the longitudinal direction of the stiffening element (48), preferably extending as an outer projection over the entire longitudinal outer side of the stiffening element (48).

9. Shading system according to claim 7 or 8, characterized in that the projection (27) is designed to cooperate with the groove, in particular the longitudinal slot (37), of the cross spindle (13), wherein the projection (27) preferably has locking hooks (29) which are particularly preferably designed to cooperate with the locking hooks (30) of the cross spindle, wherein the locking hooks (29, 30) are preferably assigned to one end of the stiffening element (48) in the elongated embodiment of the projection (27).

10. Shading system according to one of claims 7 to 9, characterized in thatthe stop (28) is arranged on the stiffening element (48), is preferably integral with the stiffening element (48) or is connected to the stiffening element (48) in a form-fitting, friction-fitting or force-fitting manner, wherein the stop (28) is preferably arranged on the end of the stiffening element (48) facing away from the latching hooks (29) and / or is designed to be impact-resistant in particular.

11. Shading system according to one of the preceding claims, characterized by a base profile (12) for holding the cross spindle (13), wherein the base profile (12) is preferably elongated and in particular runs concentrically to the winding shaft (11) and in its longitudinal direction.

12. Shading system according to claim 11, characterized in thatthe base profile (12) has at least one longitudinal groove (25), preferably two longitudinal grooves (25) on longitudinal sides facing away from one another, which are particularly preferably designed to cooperate with the inner projections (50).

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