Central storage unit for a roller shutter box and roller shutter box

Abstract

The invention relates to a central bearing unit for a roller shutter box for supporting a roller shutter shaft in an area between two shaft sections, comprising a support wall (2) that can be inserted into a roller shutter box, wherein the support wall (2) has a cam (4) extending through its entire thickness from an open cam end (4a) to a closed cam end (4b), wherein the closed cam end (4b) forms a receiving area (6) for a shaft central bearing unit (5), wherein the central bearing unit comprises an insert element (1) separate from the support wall (2), which can be inserted into the cam (4), preferably from the open cam end (4a) and / or from the side of the support wall (2), and can be fastened in the cam (4). The invention also relates to a roller shutter box with such a central bearing unit.

Description

[0001] The invention relates to a central bearing unit, in particular for a roller shutter box for supporting a roller shutter shaft in an area between two shaft sections, comprising a support wall that can be inserted into a roller shutter box, wherein the support wall has a cam extending through its entire thickness, which extends from an open cam end to a closed cam end, wherein the closed cam end forms a receiving area for a shaft central bearing unit.

[0002] The invention also relates to a roller shutter box with a central bearing unit according to the invention.

[0003] For wide roller shutter boxes where the roller shutters are divided into at least two sections, it is necessary to provide additional support for the roller shutter shaft between two adjacent sections, particularly in a central area of ​​the roller shutter box. Each section surrounds a different part of the shaft.

[0004] For this purpose, an intermediate storage unit is used, such as that known from publication EP 2 924 227 B1 of the same applicant.

[0005] In the invention, the unit is also referred to as a central bearing unit even if it is not arranged centrally in the roller shutter box. The essential point is only that it is arranged in the roller shutter box between two adjacent curtains and / or between two adjacent shaft sections.

[0006] Preferably, in the prior art and also in the invention, the central bearing unit is adapted in its outer contour, viewed in cross-section perpendicular to the shaft extension, at least in some areas to the inner contour of the roller shutter box viewed in the same direction, preferably wherein the central bearing unit is supported on the roller shutter box or surrounding elements.

[0007] Such a central bearing unit of the prior art and also of the invention has in the support wall an open cam extending over the entire thickness of the support wall as considered in the shaft extension direction, which extends from an outwardly open cam end to a closed cam end located in the support wall, wherein in the area of ​​the closed cam end, which forms a receiving area, at least during intended assembly a shaft central bearing unit is arranged or - e.g. before assembly - at least can be positioned therein, with which the shaft, in particular between the adjacent shaft sections, is supported or at least can be supported on the central bearing unit.

[0008] The closed end of the guide frame forms a bearing receptacle for the shaft center bearing unit. The open end of the guide frame is open in one direction towards the interior of the room; in particular, the open end of the guide frame terminates at an edge of the supporting wall that faces the interior wall of the roller shutter box. This allows an installer to insert the shaft section to be supported, along with the shaft center bearing unit, or even just the shaft center bearing unit alone, into the guide frame and move it along the guide frame, which is to be understood as a slot-shaped recess, until the end of the guide frame, where the shaft center bearing unit finds a stop and a receiving area.

[0009] It is preferably provided in the prior art and also in the invention that the closed end of the backdrop, viewed in the direction of height / gravity, lies below a highest point of the course of at least the lower backdrop wall of the backdrop in the retaining wall.

[0010] In areas outside the shaft's center bearing unit, the shaft is typically designed as a hollow tube with a polygonal, e.g., octagonal, cross-section, which is surrounded by the bearing housing. In the area of ​​the bearing within the center shaft bearing unit, the hollow tube is typically interrupted, and the shaft is provided with a cross-section that differs from that of the hollow tube, in particular a smaller cross-section, e.g., by at least one journal. Such a journal itself can also be polygonal or round.

[0011] According to the invention, it is also possible for the polygonal shaft, in particular the hollow tube, to be mounted directly in the shaft center bearing unit without the shaft first being tapered to a journal.

[0012] Preferably, in the prior art and also in the invention, the aforementioned support wall can be attached by force-fit, at least indirectly, via a lower wall of the roller shutter box or directly to a frame member of a window or door located below a roller shutter box, in particular the frame member that supports the roller shutter box. For this purpose, the support wall according to the invention can have at least one fastening tab on its lower region.

[0013] Preferably, this support wall can be attached by force-fit connection, at least indirectly, via an upper wall of the roller shutter box or directly to a reveal area of ​​a window or door located above a roller shutter box. For this purpose, the support wall according to the invention can have at least one fastening tab on its upper area.

[0014] The supporting wall, in particular that of the invention, is further provided to be arranged and fastened between the side walls of a roller shutter box, which comprise the two end bearings of the roller shutter shaft, e.g. by means of the aforementioned fastening tabs, in particular in a plane parallel to the respective plane of a side wall.

[0015] In this known prior art, the problem arises that the shaft center bearing unit is held only by the force of gravity in the area of ​​the closed end of the shutter, specifically in the area where the shutter is mounted. This can result in forces being exerted on the shaft center bearing unit when the roller shutter curtain is lowered, particularly when it is fully unwound. These forces can push the shaft center bearing unit, at least temporarily, away from the closed end of the shutter in the direction of the shutter's extension, and in particular, lift it out of the mounting area against the direction of gravity.

[0016] This can occur primarily when roller shutter motors are used whose limit switch is triggered by exceeding a maximum torque. Only after the roller shutter motor switches off and the forces cease does the shaft center bearing unit fall back into its mounting area, i.e., towards the closed end of the shutter mechanism. This increases the wear on the shaft center bearing unit and results in unwanted noise.

[0017] It is therefore an object of the invention to further develop a central bearing unit in such a way that a shaft central bearing unit is held more reliably in the receiving area, i.e. in the area of ​​the closed cam end, and preferably fixed against movements.

[0018] This problem is solved according to the invention by the fact that the central bearing unit comprises an insert element separate from the support wall, which can be inserted into the backing and can be fastened in the backing.

[0019] Preferably, the insert element can be inserted into the backdrop from the open end of the backdrop and / or from the side of the retaining wall.

[0020] According to the invention, the separate insert element ensures that it does not hinder the insertion of the shaft center bearing unit into the cam, because it is only used afterwards and through its use the inner free cross-section of the cam, in particular considered transversely / perpendicular to the extension direction of the cam, is at least reduced or even closed, so that the movement of the shaft center bearing unit through the insert element is restricted, preferably even prevented.

[0021] In an inventive center bearing unit in which, particularly when installed as intended in the roller shutter box, a shaft center bearing unit is inserted into the track, preferably a shaft center bearing unit can be inserted into the track from the open track end and can be slid to the closed track end, it is then preferably provided that the insert element in the track is fixed in the track between the shaft center bearing unit and the open end of the track.

[0022] In particular, the arrangement of the insert element in the guide after insertion is such that the insert element is spaced away from the open end of the guide, and in particular, the open end of the guide is not closed by the insert element. The insert element thus preferably has an extent in the guide that is less than the distance between the open end of the guide and the shaft center bearing unit.

[0023] Thus, the insert element limits the possible path of movement that remains for the shaft center bearing unit from the closed end of the cam along the extension of the cam when force is applied to the shaft center bearing unit.

[0024] In a first preferred embodiment, the invention provides that the shaft center bearing unit is an element, preferably a one-piece element, e.g. made of plastic, particularly by injection molding, which does not include any rotatable components and comprises bearing journals projecting to two opposite sides, onto which bearings can be mounted, the bearings being arranged in or on the end of a shaft section facing the support wall. Each bearing journal extends in the direction of the axis of the shaft.

[0025] In particular, the respective bearing journal can be inserted, or at least be insertable, into an inner ring of a bearing designed as a ball bearing. This means that shaft sections arranged adjacent to each other around a support wall are not rotationally fixed to one another and can be rotated, and in particular driven, independently of each other.

[0026] Such a shaft center bearing unit preferably has two cover plates spaced apart in the direction of the axis of the shaft sections or the bearing journals, over which the bearing journals project axially, and between which the support wall is arranged. A portion of the shaft center bearing unit located between the cover plates is then situated in the guide or extends through it.

[0027] Even if at least two shaft sections are provided that are not rotationally fixed to one another, between which the shaft center bearing unit or the support wall forms a support, this is considered, in the sense of the invention, to be a roller shutter shaft that is supported between the shaft sections.

[0028] A second preferred embodiment of the invention provides that the shaft center bearing unit comprises a bearing journal having two axially spaced free ends, which is rotatably mounted in the shaft center bearing unit. For this purpose, the shaft center bearing unit can comprise at least one bearing, in particular at least one ball bearing, the inner ring of which is rotationally fixed to the bearing journal and the outer ring of which is rotationally fixed to the support wall, in particular a cam wall. This allows the rotation of a shaft section to be transmitted through the shaft center bearing unit to an adjacent shaft section. In such a shaft center bearing unit, the bearing journal can, for example, be designed as a polygonal, e.g., rectangular journal. The free end of such a bearing journal can be rotationally fixed to the end of a shaft section facing the support wall, in particular rotationally fixed.

[0029] It is particularly preferred that a region of the insert element facing the shaft center bearing unit contacts the shaft center bearing unit, in particular a partial component thereof. The contacted part of the shaft center bearing unit is, in particular, one that lies in the groove or extends axially through it.

[0030] In this case, the shaft center bearing unit is held stationary in the receiving area, i.e., in contact with the closed end of the cam, by contact with the insert element and preferably cannot move at all.

[0031] Furthermore, it is particularly preferred that during assembly, e.g. by means of a screw, a force is also exerted indirectly on the shaft center bearing unit via the insert element, with which the shaft center bearing unit is pressed towards the closed cam end, i.e. into the receiving area.

[0032] A preferred design provides for the area of ​​the insert element that contacts the shaft center bearing unit to be resiliently flexible. This resilient flexibility can generate a force during installation that pushes the shaft center bearing unit towards the closed end of the track. It can also cause the shaft center bearing unit to yield slightly to the force applied by the roller shutter motor, as it can move slightly against the resilience of the insert element, but is then pushed back into its original position by the spring action once the force is removed.

[0033] Preferably, the insert element is designed such that it is attached to or in the retaining wall in the area facing the open end of the guide, or at least can be attached to it. At this end, the insert element also offers easy access for an installer after it has been inserted into the guide.

[0034] Preferably, the insert element is bolted to the support wall in a fully assembled center bearing unit. This is preferably achieved with a bolt that penetrates the insert element within its material thickness and is screwed into a wall of the support wall that runs in the same direction as the wall's thickness. In this case, the material thickness of the insert element is considered in a direction parallel to the shaft's direction of travel.

[0035] A preferred embodiment provides that an upper wall area of ​​the backdrop, in particular a wall area of ​​the backdrop located above the recording area, preferably the backdrop with both opposing wall areas, is formed with an arc shape / curve in a region in front of the recording area, and that a region of the insert element contacting this upper wall area corresponds at least partially to the negative shape of the wall area. The arc shape is particularly preferably designed as a circular arc.

[0036] By adapting the insert element with a negatively shaped area corresponding to the curvature of the cam wall, the upper wall area and the contacting area of ​​the insert element are ensured to fit together, at least partially, in a form-fitting manner. This allows the insert element to be held securely in place. Furthermore, the precise circular arc shape on the cam wall and the contacting area of ​​the insert element allows the insert element to be moved around the common center point of the two corresponding circular arc shapes within the cam towards the shaft center bearing unit when a force is applied to it, for example, by a screw.

[0037] A preferred embodiment may further provide that an area of ​​the backdrop adjacent to the open end of the backdrop extends in a straight line, preferably vertically, in particular wherein both opposing backdrop walls run parallel to each other in this area.

[0038] Generally, it can be provided that the opposing backdrop walls maintain a constant distance from the open end of the backdrop to the closed end, and in particular that they merge into one another at the closed end, preferably with a circular arc whose radius corresponds to half the distance between the opposing backdrop walls. However, when viewed in the direction of the thickness of the backdrop wall, and especially in the direction of wave propagation, this constant distance need not be identical everywhere. For example, the distance can increase towards the center of the backdrop wall (relative to its thickness).

[0039] A preferred embodiment provides that the retaining wall comprises at least two, preferably exactly two, parallel plates adjacent to each other and connected to each other, wherein at least one plate is made of metal, in particular the one comprising the aforementioned fastening tabs, and wherein at least one other plate is made of plastic, in particular the plate with the greater or greatest thickness of the at least two plates.

[0040] It is then preferably provided that the insert element is fastened in the plastic plate, e.g. by means of a screw, for which a screw can be inserted directly through the insert element into the plastic material of this plate, preferably without pre-drilling.

[0041] A preferred embodiment provides that the support walls lying in the thickness direction of the retaining wall have a groove. This design can result in the aforementioned distance between the opposing support walls increasing in the thickness direction from both sides of the retaining wall, particularly up to the center of the retaining wall or the center of the thicker / thickest slab. Preferably, such a groove is provided with a rounded cross-section or base.

[0042] Preferably, the groove cross-section or groove base is shaped to correspond to the shape of an outer ring of a ball bearing in the shaft center bearing unit, in particular such that the outer ring is positively engaged in the groove or at least its groove base at its outer periphery. The shaft center bearing unit can also have a shape adapted to the groove cross-section in its area located in the support wall, even if it does not itself contain a bearing / ball bearing.

[0043] Preferably, the groove is formed in only one of the at least two aforementioned plates, in particular in the plastic plate.

[0044] A preferred embodiment of the insert element provides that it is designed as an element that extends in a curved shape, at least partially, and in particular in a region between its ends, corresponding to the course of a wall section of the backdrop in front of and / or above the receiving area. The curved extension of the insert element is present at least on an outer surface facing the wall of the backdrop located in front of and / or above the receiving area. The ends of the insert element are preferably spaced apart in the direction of extension of the backdrop or along the backdrop.

[0045] Preferably, it is provided that one end has or forms a fastening area for fastening the insert element to the support wall, in particular to the backdrop wall, and at least one, in particular another, end comprises or forms a contact area with which a shaft center bearing unit can be contacted.

[0046] It can therefore also be provided that each of the two ends has or forms a fastening area and each of the two ends also has or forms a contact area.

[0047] Viewed in a cross-section perpendicular to the wave direction, and in particular when looking down at the insert element in the wave direction, it can be provided that the ends are thickened compared to a connecting area lying between them, which includes the correspondingly curved area of ​​the insert element.

[0048] A preferred embodiment provides that at least the end facing the open end of the mounting has a through-opening. This design with the through-opening functionally forms a fastening area at the end. This through-opening can be used to insert a fastener, e.g., a screw, and secure the insert element. Preferably, both ends each have a through-opening through which a fastener, in particular a screw, can be inserted.

[0049] A preferred embodiment provides that both ends are identical and / or that both ends are mirror-symmetrical about a plane lying between the ends, in particular one that forms a plane of symmetry for the entire insert element. Preferably, the entire insert element is mirror-symmetrical about a central plane. Therefore, it is irrelevant in which orientation a fitter inserts the insert element into the mounting, as it can be mounted and secured in both orientations.

[0050] Further development may also provide that the insert element has a curved projection on its outer surface between its ends, which is in contact with the curved wall area of ​​the support in front of and / or above the receiving area. This projection can be inserted into the aforementioned groove, particularly in a form-fitting manner. Specifically, the cross-section of this projection, perpendicular to the extension of the insert element between its ends, is adapted to the shape of the groove cross-section / groove base. This allows the insert element to be centered or at least axially fixed in the support, particularly in its groove, in the thickness direction of the support wall.

[0051] A particularly preferred embodiment of the insert element provides that it is designed as a strip of material, in particular as a plastic strip or as a metal strip, preferably with a uniform thickness, extending at least in certain areas, especially between its ends, corresponding to the course of an area of ​​the backdrop wall in front of and / or above the receiving area.

[0052] In this case, the thickness referred to here is preferably perpendicular to the direction of extension of the shaft, and in particular also perpendicular to the direction of the spacing between the two ends of the insert element.

[0053] Furthermore, it is provided that at least one of the ends of the material strip is bent towards the concave side of the material strip. Preferably, both ends are bent towards each other towards the concave side of the material strip.

[0054] Preferably, at least one bent end, in particular both, forms an acute angle with the adjacent bent area of ​​the material strip.

[0055] A bent end pointing towards the receiving area preferably forms a stop surface or contact area with which a pressure force can be exerted on the shaft center bearing unit. Each bent end can form a tab, in particular a tab with a flat surface. Such a bent, especially tab-shaped, end can, due to the angle it forms with respect to the adjacent area of ​​the insert element, create a resiliently compliant area, as previously mentioned.

[0056] It is further preferably provided that a slot-shaped recess, in particular a slot-shaped recess extending in the direction of the spacing of the ends, is arranged in the area of ​​the material strip between its ends and that at least one of the ends, preferably both ends, in particular tab-shaped ends, has a through-opening.

[0057] This provides a mounting option in which a screw is inserted through the through-hole of one of the two ends / tabs and through the slotted recess. When screwed in, the screw exerts a force on the end / tab, which moves the insert element along the back wall because the slotted recess allows the insert element to slide around the screw in the direction of the slot.

[0058] The bent end pointing towards the open end of the cam serves for fastening, and the end pointing towards the shaft center bearing unit / the receiving area comes into contact with the shaft center bearing unit and remains spring-like and flexible.

[0059] With identical design at both ends, especially with the previously mentioned mirror symmetry of the insert element about a plane lying between the ends, it is irrelevant in which direction the insert element is mounted in the backdrop during assembly.

[0060] The invention is described below with reference to the figures. Figure 1: shows a perspective view of a center bearing unit with a shaft center bearing unit and attached insert element inserted therein. Figure 2: shows the same center bearing unit in plan view parallel to the direction of extension of the shaft. Figure 3: shows a detailed enlargement of the section in the Figure 2The circled area in Figure 4 shows a first embodiment of an insert element, which is used in the central bearing units of the Figures 1 to 3 Figure 5 shows an alternative embodiment of an insert element, which is also used in the intermediate bearing units of the Figures 1 to 3 Figure 6 shows another alternative embodiment of an insert element, which can also be used in the central bearing units of the Figures 1 to 3 can be used.

[0061] The Figures 1 to 3 All show the same embodiment of a central bearing unit according to the invention with a first possible embodiment of an insert element 1, which the Figure 4 shows in detail.

[0062] The central bearing unit comprises a support wall 2, which in this case is formed from a metallic plate 2a and an associated plastic plate 2b. The plastic plate 2b has a greater thickness than the metallic plate 2a. This thickness is measured in the direction of the extension 3 of the shaft (not shown here).

[0063] The metallic plate 2a of the support wall 2 further comprises a lower mounting tab 2c at its lower edge and an upper mounting tab 2d at its upper edge. These mounting tabs 2c and 2d serve to fasten the support wall 2 within the roller shutter box (not shown) and / or indirectly via its walls to an upper frame member of a window or door and to the upper lintel or an upper reveal area. The support wall 2 can thus also be designed as a load-bearing component within the roller shutter box.

[0064] In the Figure 3The cross-sectional view clearly shows that the supporting wall 2 comprises a guide 4, the opposing walls of which define a free space extending through the supporting wall 2 in the thickness direction. When installed as intended in the roller shutter box, the open end 4a of the guide 4 preferably points towards the interior of the room and is accessible from there. The closed end 4b of the guide 4 forms or comprises a receiving area 6 into which a shaft center bearing unit 5 can be received. The shaft center bearing unit 5 can be inserted into the guide 4 from its open end 4a and slid along the guide 4 to the closed end 4b, or the receiving area 6.

[0065] The shaft center bearing unit 5 is preferably an element without rotating components, preferably manufactured in one piece from plastic. In this preferred embodiment, it comprises two disks 5a enclosing a region 5c between them that penetrates the cam, so that the support wall 2 lies between these disks 5a. It further comprises two bearing journals 5b extending axially 3 outwards, i.e., away from the support wall 2 or from the disks 5a. These journals can be received in a respective inner ring of a bearing / ball bearing, which is arranged in each end of a shaft section facing the support wall. Thus, each shaft section is rotatable independently of the others relative to the stationary shaft center bearing unit 5.

[0066] The open end 4a of the backdrop 4 has a section 4d in which the backdrop 4v runs in a straight line, here vertically, with the opposing backdrop walls running parallel to each other. Towards the closed end 4b of the backdrop, this is followed by a curved section 4c1, 4c2 of the backdrop 4, which also lies at least partially above the closed end 4b. In the embodiment shown here, this curved section 4c1, 4c2 of the backdrop 4 is formed as a precise circular arc around a center point 7 located in the supporting wall 2. This is preferred but not mandatory. In this embodiment shown here, the distance between the opposing backdrop walls is also preferably the same everywhere along the extent of the backdrop 4, except at the closed end 4b, where the backdrop walls merge into each other with a circular arc, in particular whose radius corresponds to half the distance between the backdrop walls.In the direction of the thickness of the support wall 2 (viewed in direction 3 of the shaft), the distance between the cam walls is not uniform because a groove 8, in particular with a rounded groove base 8a, is preferably incorporated into the opposing cam walls. Here, the groove 8 is only formed in the plastic plate 2b of the support wall 2.

[0067] At the deepest point of the groove cross-section or the groove base 8b, the distance between the backing walls is at its maximum and decreases towards the edge of the groove.

[0068] In the embodiment shown here, the area 5c of the shaft center bearing unit 5, which is located in the cam 4 and lies between the disks 5a, rests on the upper edge of the groove 8; in particular, it does not penetrate into the groove, although this may also be possible with a corresponding design.

[0069] In another embodiment of the shaft center bearing unit 5, not shown here, the outer bearing ring of a ball bearing of the shaft center bearing unit 5 can be arranged in the groove 8, with a bearing journal rotatably seated in the inner ring of this ball bearing. In this alternative embodiment, the shaft center bearing unit 5 is thereby fixed in the direction 3 of the shaft, in particular axially, by the positive locking between the outer ring and the groove, and thus cannot slip out of the groove 4 in the direction of the shaft 3.

[0070] The essential aspect of the invention is that according to Figure 2 The insert element 1 is inserted into the guide 4 and can be slid in the guide 4 towards the closed guide end 4b until contact is made with the shaft center bearing unit 5, in particular with its area 5c located in the guide 4. This is best shown in detail in the Figure 3the achieved final position of the insert element 1, which is screwed into the retaining wall 2, in particular into the plastic plate 2b of the retaining wall 2, with a screw 10.

[0071] The Figure 4 shows in detail several views of a possible preferred design of the insert element 1, which is used in the Figures 1 to 3 is used.

[0072] The insert element 1 is designed here as a strip of material, or a band-shaped element, e.g., made of plastic or preferably of metal. It has a curved section 1a, here a convexly outwardly curved section 1a, which extends in a curved shape between its ends 1b. The course of this curved section 1a is adapted to the curved course of the backdrop 4 in the area 4c1 in front of and above the recording area 6. The convex shape of section 1a effectively forms the negative shape of the concave shape of the upper curved backdrop wall 4c1 in the Figure 3 .

[0073] The two ends 1b are tab-shaped and bent towards each other from the curved area 1a and in the direction of the concave side of the curved area 1a. The term "bent" does not necessarily imply that the visible shape of the insert element 1 is achieved by mechanical bending, i.e., a forming process, although this is possible. The insert element 1 can also be pre-formed in the shape shown. In this embodiment, it is preferred that the insert element 1 is mirror-symmetrical about a plane of symmetry E, so that the orientation in which it is inserted into the recess 4 by an installer is irrelevant.

[0074] The two tab-shaped ends each have an opening 1c to allow a fastening element, e.g., the screw 10 shown, to pass through. Only the end 1b facing the open cam end 4a serves for fastening, whereas the end 1b facing the closed cam end 4b is in contact with the shaft center bearing unit 5 or its area 5c located between the disks 5a.

[0075] In the curved section 1a, a slot 1d is arranged between the ends 1b, through which the screw 10 can also be inserted after passing through the openings 1c. This allows the insert element 1a to be displaced along the cam wall towards the shaft center bearing unit 5 by means of the force exerted on the end by the screw head.

[0076] The Figure 5This shows only an alternative embodiment of the insert element 1 without depicting the rest of the center bearing unit. In this simple embodiment, the insert element 1 is, for example, made of solid plastic in the form of a circular disc section / segment, e.g., as an injection-molded or stamped part. For fastening, a screw is driven through the material of the insert element 1 into the plate 2b of the support wall 2 in the area of ​​one of the two ends 1b, with the other end contacting the shaft center bearing unit 5.

[0077] The Figure 6Figure 1 shows a further alternative embodiment of the insert element 1 with two ends 1b, which have the curved area 1a between them. This curved area additionally has a curved projection 1e on the side facing the cam wall 4c1 to be contacted, which can be inserted into the groove 8, thus fixing the insert element 1 axially with respect to the shaft direction 3. The ends 1b are thickened compared to the curved area 1a and each has through-openings 1c, as in the embodiment shown in Figure 1. Figure 4 .

[0078] Preferably, the openings within the material of the insert element 1 extend towards the surface of the curved area 1a, which is in contact with the curved backdrop wall 4c1, in particular also enabling the insert element 1 to be displaceable during fastening.

[0079] In all the embodiments shown, the aforementioned mirror symmetry of the insert element 2 with respect to a plane E is present.

Claims

1. A central bearing unit for a roller shutter box for supporting a roller shutter shaft in an area between two shaft sections, comprising a support wall (2) that can be inserted into a roller shutter box, wherein the support wall (2) has a cam (4) extending through its entire thickness from an open cam end (4a) to a closed cam end (4b), wherein the closed cam end (4b) forms a receiving area (6) for a shaft central bearing unit (5), characterized by the fact thatit comprises an insert element (1) separate from the support wall (2), which can be inserted into the cam (4), preferably from the open cam end (4a) and / or from the side of the support wall (2) into the cam (4), and can be fastened in the cam (4), wherein the insert element (1) is designed as an element that extends in a curved manner at least in part, in particular in a region (1a) between its ends (1b), corresponding to the course of a wall region (4c1) of the cam wall in front of and / or above the receiving area (6), preferably wherein one end (1b) comprises or forms a contact region with which a shaft center bearing unit (5) can be contacted.

2. Central bearing unit according to claim 1, characterized by the fact thatit comprises a shaft center bearing unit (5) inserted into the cam (4), in particular which can be inserted into the cam (4) from the open cam end (4a) and can be slid to the closed cam end (4b), wherein the insert element (1) is fixed in the cam (4) between the shaft center bearing unit (5) and the open end (4a) of the cam (4).

3. Central bearing unit according to claim 2, characterized by the fact that a region (1b) of the insert element (1) pointing towards the shaft center bearing unit (5), in particular the end (1b) having the contact area, contacts the shaft center bearing unit (5) and is resiliently flexible.

4. Central bearing unit according to one of the preceding claims, characterized by the fact that the insert element (1) is attached to or in the retaining wall (2) in its area pointing towards the open end (4a) of the backdrop (4).

5. Central bearing unit, in particular according to claim 4, characterized by the fact thatthe insert element (1) is screwed to the retaining wall (2), in particular with a screw (10) which penetrates the material thickness of the insert element (1) and is screwed into a wall of the backdrop (4) running in the thickness direction of the retaining wall (2).

6. Central bearing unit according to one of the preceding claims, characterized by the fact that an upper wall area (4c1) of the backdrop (4), in particular a wall area (4c1) of the backdrop (4) lying above the receiving area (6), preferably the backdrop (4) with both opposing wall areas (4c1, 4c2) in front of the receiving area (5), is formed with an arc shape / a curvature, in particular with a circular arc shape, and an area (1a) of the insert element (1) contacting this upper wall area (4c1) corresponds at least partially to the negative shape of the wall area (4c1) of the backdrop (4).

7. Central bearing unit according to one of the preceding claims, characterized by the fact thatan area (4d) of the backdrop (4) adjoining the open backdrop end (4a) is extended in a straight line, preferably vertically, in particular both opposing backdrop walls in this area (4d) run parallel to each other.

8. Central bearing unit according to one of the preceding claims, characterized by the fact that the retaining wall (2) comprises at least two parallel and interconnected plates (2a, 2b), wherein at least one plate (2a) is made of metal, in particular the one which includes fastening tabs (2c, 2d), and wherein at least one other plate (2b) is made of plastic, in particular the plate (2b) with the greater or greatest thickness of the at least two plates (2a, 2b).

9. Central bearing unit according to one of the preceding claims, characterized by the fact thatthe backdrop walls lying in the thickness direction of the support wall (2) have a groove (8), in particular with a rounded groove cross-section or groove base (8a), in particular wherein the groove (8) is formed in only one of the at least two plates (2a, 2b) according to claim 8, in particular in the plate (2b) made of plastic.

10. Central bearing unit according to one of the preceding claims, characterized by the fact that one end (1b) of the insert element (1) has or forms a fastening area for fastening the insert element (1) to the support wall (2), in particular to the cam wall, and the other end (1b) comprises or forms the contact area with which a shaft center bearing unit (5) can be contacted.

11. Central bearing unit according to one of the preceding claims, characterized by the fact thatat least the end (1b) of the insert element (1) pointing towards the open end (4a) of the cam (4) has a through opening (1c), preferably both ends (1b) each have a through opening (1c) through which a fastening means, in particular a screw (10), can be passed.

12. Central bearing unit according to one of the preceding claims, characterized by the fact that both ends (1b) of the insert element (1) are identical and / or both ends (1b) are mirror-symmetrical about a plane (E) lying between the ends, in particular forming a plane of symmetry (E) of the entire insert element (1).

13. Central bearing unit according to one of the preceding claims, characterized by the fact thatthe insert element (1) has a curved extending projection (1e) between its ends (1b) on its outer surface / curved area (1a), with which the curved wall area (4c1) of the backdrop (4) in front of and / or above the receiving area (6) can be contacted, which can be inserted into the groove (8) according to claim 9, in particular in a form-fitting manner.

14. Central bearing unit according to one of the preceding claims, characterized by the fact thatThe insert element (1) is designed as a material strip, in particular a plastic strip or metal strip, preferably with the same thickness throughout, extending at least partially, in particular between its ends (1b), corresponding to the course of a region (4c1) of the cam wall in front of and / or above the receiving area (6), wherein at least one of the ends (1b) of the material strip is bent towards the concave side of the material strip, preferably wherein both ends (1b) are bent towards each other in the direction of the concave side of the material strip, in particular wherein a slot-shaped recess (1d) is arranged in the curved region (1a) between the ends (1b) and at least one of the ends (1b), in particular both ends (1b), have a through-opening (1c).

15. Roller shutter box with a central bearing unit according to one of the preceding claims.

Images