EP4194658A2 - Drive roller for a roller blind, bearing unit for a roller blind shaft and roller blind - Google Patents

Abstract

The present invention relates to a drive roller (5) for a roller blind (1), a bearing unit (3, 4) for a roller blind shaft (2) and a roller blind (1) with such a drive roller (5) and/or such a bearing unit (3 , 4). According to a first aspect, the drive roller (5) is designed with an approximately V-shaped cable groove (10), the opposite groove surfaces (11, 12) formed as a result being represented by concave facets (13), so that radially extending clamping edges (16) form. A braided rope (50) can be guided in such a rope groove (10), with sufficient traction for driving the drive roller (5) and on the other hand the rope (50) not jamming in the rope groove (10). Another aspect is the bearing of a roller blind shaft (2) with a defined, adjustable frictional connection.

Description

The present invention relates to a drive roller for a roller blind, a bearing unit for a roller blind shaft and a roller blind with such a drive roller and/or such a bearing unit.

Roller blinds are known in different ways for shading windows. Basically, roller blinds have a shaft to which a roller blind fabric is attached. This shade fabric can be unrolled from and rerolled onto the shaft to be placed adjacent a window. The roller blind fabric can be designed to shade a corresponding window. However, there are also roller blinds that have a flexible insect screen as the roller blind fabric and serve as insect protection when the window is open.

Different roller blinds, which differ mainly in the operating mechanism or in the mounting system, go, for example, from the EP 2 057 342 B1 , WO89/08766 A1 , WO02/33194 A1 , EP 1 272 726 B1 or DE 10 2009 016 390 A1 out.

A typical structure of a conventional roller blind is, for example, in WO 89/08766 A1 described. A spring is preloaded when the roller blind material is unrolled from the roller blind shaft. The roller blind is operated using a non-slip cord on which balls are arranged at regular intervals. The cord interacts in a form-fitting manner with an actuating mechanism by means of the balls.

The object of the invention is to create a drive roller for a roller blind, a bearing unit for a roller blind shaft and a roller blind with such a drive roller or such a bearing unit, which allow the mechanism of the roller blind to be made from natural raw materials, such as wood, and some metal parts, the blind fulfills all the functions of conventional blinds.

The object is solved by the subject matter of the independent patent claims. Advantageous configurations are specified in the dependent claims.

A drive roller according to the invention for a roller blind has a circular disc-shaped body with two side surfaces and a lateral surface. A cable groove for accommodating a cable opens all the way around the lateral surface. The cable groove has an approximately V-shaped cross section with two groove surfaces lying opposite one another. The groove surfaces have a plurality of concave facets which abut one another in the circumferential direction and thus form clamping edges which run approximately radially.

A drive pulley with such a cable groove can be actuated with a cable made of braided natural fibers. Experiments by the inventor have shown that when using a conventional, braided rope made of natural fibers, it is difficult, on the one hand, to create the necessary frictional connection between the drive pulley and the rope and, on the other hand, to prevent the rope from anchoring itself in the groove so strongly that it cannot more can be solved. When the rope is pulled, the drive pulley must be reliably carried along and the rope should not slip in the rope groove, and the rope should not jam in the rope groove. By pulling on the cable, the drive roller is set in a low-slip to non-slip rotational movement.

The rope can be any type of cordage. The ropes used in the present invention may also be referred to as cords or lanyards. As a rule, the diameter of the unloaded rope is no more than 10 mm and preferably no more than 7 mm or no more than 5 mm.

Due to the design of the radially running clamping edges, which are preferably arranged in pairs opposite one another, the rope is clamped in the area of the clamping edges between the groove surfaces and lies in the area up to the next clamping edges essentially without being clamped in the rope groove. As a result, the rope is fixed at certain points in the rope groove, with these fixing points (or the clamping edges) being spaced apart from one another. It has been shown that with this configuration of the rope groove, on the one hand, there is the necessary frictional connection between the rope and the drive pulley in order to reliably drive the drive pulley, and on the other hand, the rope is reliably released from the rope groove. Therefore, no stripping device is necessary.

V-shaped means that the opposite clamping edges do not run parallel, but enclose an angle that opens radially outwards. The V-shaped cable groove can have a bottom, ie the cable groove does not have to be tapered radially inwards.

At their radially inner end, the tangents of the clamping edges have an angle of at least 20°, preferably at least 25° and in particular at least 30° with respect to a vertical. This angle should preferably not be greater than 60° and in particular not greater than 45°. At the radially outer end of the clamping edge, the inclination of a tangent on the clamping edge is less than the vertical and is, for example, in the range from 0° to 10°. Preferably, the clamping edges are concave, with the angle of the respective tangents steadily decreasing from radially inside to radially outside, so that the clamping edge forms a smooth curve.

Thus, the clamping edges have a concave shape in which the tangents at the radially inner ends of the clamping edges enclose an angle with the vertical which is at least 10° greater than a corresponding angle of a tangent at the radially outer end of the clamping edges. The difference in the angles is preferably at least 15° or at least 20°.

Since the facets are concave, the clamping edges are formed on the one hand and a free space is created on the other hand in the area between adjacent clamping edges, in which the rope lies loosely in the groove without jamming with the groove. The facets are usually arcuately concave. However, it is also possible to approximate the arc shape of the facets with a polygon. This mainly depends on the manufacturing process used. Arched facets can easily be created by milling.

A radially inner bottom edge or bottom surface is preferably recessed, in particular recessed in an arc shape, between two facets lying opposite one another in the area between adjacent clamping edges in the circumferential direction.

The facets of the groove surfaces are preferably arranged in pairs opposite one another, so that the clamping edges are also arranged in pairs opposite one another. In principle, however, it is also possible for the clamping edges of the two groove surfaces to be offset from one another in the circumferential direction.

The drive roller is formed from a circular disc-shaped body. The shape of the circular disk can also be approximated by a polygon. The number of corners of such a polygon preferably corresponds to the number of pairs of clamping edges. Preferably, the cable grooves are concave, at least in the area of the clamping edges. This is particularly useful for ropes with a circular cross-section.

The clamping edges are preferably arranged radially circumferentially at the same distance from each other. The distance between two adjacent clamping edges of a groove surface on the lateral surface is preferably at least 10 mm, in particular at least 15 mm or at least 20 mm and can even be at least 25 mm. The larger the diameter of the drive roller, the larger the distance between the adjacent clamping edges can be.

A drive roller preferably has at least 4 clamping edges, in particular at least 6 clamping edges or at least 8 clamping edges or at least 10 clamping edges per groove surface.

It is expedient to provide no more than 15 clamping edges or no more than 13 clamping edges per groove surface on a drive roller.

The maximum curvature of the concave facets with respect to the corresponding clamping edges is no more than 0.7 mm, in particular no more than 0.5 mm or no more than 0.3 mm.

Such a cable groove can also be formed in a natural material, such as wood, with the necessary precision, for example by milling, so that reliable operation of the drive pulley is ensured.

The drive roller can have a central bore which opens out at least on one of the two side surfaces and is designed to accommodate a roller blind shaft. The central hole can be a blind hole or a through hole.

In the region of the cable groove, the drive roller can have an approximately radially running through bore, which opens into the central through bore and is designed to accommodate a clamping screw. This allows the drive roller to be fixed against rotation on the roller blind shaft. Alternatively, the shaft can be connected to the drive roller, e.g.

The drive roller can be provided with a guide groove which is provided circumferentially and parallel to the rope groove. With this guide groove, the drive roller can be laterally limited in a bearing block with some freedom of movement, as will be explained in more detail below. The drive roller is preferably made of wood. However, a drive pulley with such a cable groove can also be formed of another material, such as metal or plastic, and the cable groove would allow the drive pulley to be reliably operated by means of, for example, braided cable.

The cable is preferably an endless cable with a substantially constant diameter over the entire length of the cable.

In addition, it is expedient if the cable has an essentially constant flexural rigidity over the entire length.

The roller blind is preferably arranged as a roller shutter adjacent to a window in order to be able to cover the window area and thus to fulfill the privacy, shading or blackout function. The roller blind is primarily intended to be used inside a building. In principle, however, it is possible to attach the roller blind to the outside of a building or other supporting structure such as a covered pergola.

In addition, the roller blind can also be provided, for example, to cover or replace furniture fronts. The roller blind mechanism is preferably integrated into the furniture body in order to avoid structural redundancies and to be able to lower the roller fabric, for example, in a groove-guided manner almost flush with the furniture front on all sides or roll it up to save space. In addition to the visual appearance, advantages can be achieved through reduced furniture transport weight, cost savings and the elimination of the space required for swing doors when opening. Furthermore, the roller blind can be arranged on an upper edge of a furniture front or on the ceiling or on an upper covering wall of a piece of furniture in order to be able to be lowered in front of the furniture front. For example, furniture such as open shelves can be protected from dust and privacy and upgraded in terms of appearance, privacy and room acoustics.

Furthermore, the roller blind can be provided both inside a building and outside as a privacy screen that is not coupled to furniture, windows or doors. For example, the roller blind can be provided in a kitchen as a privacy screen on a hatch or as a room divider between individual areas of a room. Outside of a building, for example, covered but open areas, such as side areas of a terrace, can be provided with the roller blind as a privacy screen.

According to a further aspect of the invention, a bearing unit for a roller blind shaft is provided. The bearing unit includes a bearing block with a through hole for receiving the roller blind shaft, which is mounted therein with little play. Adjacent to the roller blind shaft is an arcuate clamp, which has a friction lining, in particular a felt lining, on a clamping surface facing the roller blind shaft, in order to be adjustable in the radial direction with respect to the roller blind shaft by means of an adjusting device, so that a frictional resistance between the roller blind shaft and the clamping surface is fixed and a direct Contact between the shaft and through hole in the bearing block can be prevented.

This makes it possible to adjust the frictional resistance and the adhesive resistance between the roller blind shaft and the clamping surface, so that on the one hand a roller blind is reliably held in the respective unrolled position by the static friction and on the other hand the frictional resistance when the roller blind shaft moves relative to the clamping surface is so low that the roller blind shaft can be operated without excessive effort.

In principle, the clamp can be arranged at any point in the bearing unit adjacent to the roller blind shaft. In a very space-saving embodiment, the clamp forms a section of the through hole in which the roller blind shaft is mounted in the bearing block.

The clamp is preferably arranged with one end pivotably in the bearing block and is acted upon at the other end by the adjusting device. The adjusting device can be a worm screw, for example, which is arranged in a screw-in sleeve in the through hole in the bearing block.

The bearing block can be designed with a blind hole-shaped recess for accommodating a drive roller, the recess being arranged concentrically with the through hole for accommodating the roller blind shaft and having an approximately cylindrical peripheral surface and an approximately circular bottom surface. In the area of the peripheral surface, a through-slot can be formed, which runs transversely to the axis of the through-hole. A cable for driving the drive pulley can run through the through-slot. At the same time, the recess delimits the sector in which the drive line can detach from the drive groove up to the point where it engages in the drive groove again. The bottom surface of the recess or the side surface of the drive roller abutting the bottom surface can be provided with a sliding lining such as a felt lining, whereby the two surfaces slide against each other with little frictional resistance and no sound when touching each other generate. This covering thus serves both to avoid noise and to enable the drive roller to be rotated with little mechanical resistance.

The storage unit can have a drive roller, as explained in more detail above.

In the region of the peripheral surface of the recess in the form of a blind hole, the bearing block can have a through hole for receiving a guide pin, which can engage in the guide groove of the drive roller. This clearly defines the position of the drive roller in the axial direction of the roller blind shaft and limits the freedom of movement.

The bearing block can have a mounting plate with horizontal projections for wall mounting, and vertically running grooves can be formed in the bearing block in the region of the projections. As a result, the bearing block can be hung with the projections of the mounting plate on legs protruding obliquely upwards from a wall mounting bracket.

This mounting plate is preferably offset slightly inwards on the bearing block, so that the mounting plate and the wall mounting bracket are completely surrounded and covered by the bearing block in the suspended state and the back of the bearing block comes into full contact with the wall surface for stabilization.

The wall mounting bracket can have a base plate for mounting on a wall, on which the legs are formed.

The legs preferably have teeth on an edge which is engaged by the projection of the mounting plate. These teeth ensure that the bearing block is securely fixed to the wall mounting bracket. The size of the teeth is preferably less than 1 mm, in particular less than 0.5 mm or less than 0.3 mm, and the tooth geometry is designed for easy attachment and inhibited detachment.

According to a further aspect of the invention, a roller blind is provided with a roller blind shaft, which is mounted with its ends in a bearing unit, one end of the roller blind shaft being connected to a drive roller. The roller blind is characterized in that the drive roller is designed according to one of the above statements and/or one of the two bearing units is designed according to one of the above explained embodiments. A roller blind fabric that can be rolled up and down is attached to the roller blind shaft. A cable can be provided for actuating the drive shaft.

A roller blind with the drive roller explained above can be designed without a scraper device, since the cable is reliably released from the cable groove.

The blind fabric can be a blind fabric used for shading. However, the blind fabric can be an insect screen. In principle, all roller blind-compatible fabrics are suitable for the roller blind. Fabrics are preferably used which can be used directly after cutting without overcasting (trimming). Here, no thickening is caused by seams on the rolled-up blind fabric in the edge area when rolling up.

The roller blind is preferably made exclusively of natural materials, such as wood (bearing block, drive roller) and natural fibers, such as hemp, for the rope and metal parts. Preferably, all metal parts (roller shaft, clamp, mounting plate, wall mounting bracket) are made of aluminum or an aluminum alloy or stainless steel, so that these materials can be sorted for recycling. In the case of the use of light composite materials such as pipes made of a carbon fiber composite material, a simple disassembly for further use as a component is provided.

The roller blind can be delivered completely pre-assembled by the manufacturer. Only the wall mounting brackets have to be attached to a wall. The storage units can then be attached to the appropriate wall mounting brackets simply by hanging. A complete roller blind has two bearing units, one of the two bearing units being provided with a drive roller and the other bearing unit having essentially the same design, although the function of the drive roller is missing here.

The rope is preferably an endless rope without a limiting clip (as with strings of beads). It can also be made shorter than traditional strings of beads and designed solely for handle height and operability. This eliminates the risk of strangulation and unauthorized operation by small children.

The rope preferably has a core-sheath braid, with a joint area at which the two ends of a rope are connected, e.g secured to the core.

Figur 1

ein Rollo ohne Rollostoff in perspektivischer Ansicht von schräg vorne,

Figur 2

das Rollo aus Figur 1 in perspektivischer Ansicht von schräg hinten in einer Explosionsdarstellung,

Figur 3a

eine Antriebsrolle des Rollos aus Figur 1 in perspektivischer Ansicht,

Figur 3b

die Antriebsrolle aus Figur 3a in einer Ansicht von vorne,

Figur 4

einen Lagerbock für eine Lagereinheit des Rollos aus Figur 1 in perspektivischer Ansicht mit Blickrichtung schräg auf eine Ausnehmung zur Aufnahme der Antriebsrolle in perspektivischer Ansicht,

Figur 5

einen Wandmontagehalter in perspektivischer Ansicht,

Figur 6

eine Montageplatte in perspektivischer Ansicht, und

Figur 7

eine Klemmschelle in perspektivischer Ansicht.

The invention is explained in more detail below by way of example with reference to the drawings. The drawings show in:

figure 1

a roller blind without roller blind fabric in a perspective view diagonally from the front,

figure 2

the blind off figure 1 in a perspective view from diagonally behind in an exploded view,

Figure 3a

a drive roller of the blind figure 1 in perspective view,

Figure 3b

the drive roller off Figure 3a in a front view,

figure 4

a bearing block for a bearing unit of the roller blind figure 1 in a perspective view looking obliquely at a recess for receiving the drive roller in a perspective view,

figure 5

a wall mounting bracket in perspective view,

figure 6

a mounting plate in perspective view, and

figure 7

a clamp in perspective view.

A roller blind 1 according to the invention has a roller blind shaft 2 whose ends are each mounted in a bearing unit 3 , 4 .

A roller blind fabric that can be rolled up and down is attached to the roller blind shaft 2 . For the sake of clarity, the blind fabric has been omitted from the accompanying drawings.

One end of the roller blind shaft 2 is provided with a drive roller 5 ( figure 1 , 3a , 3b ) tied together.

The drive roller 5 is formed from a circular disc-shaped body with two side surfaces 6, 7 and a lateral surface 8.

On the lateral surface 8 a guide groove 9 and a cable groove 10 are attached. The guide groove 9 is incised in a rectangular shape with two parallel side flanks and a smooth, circumferential bottom surface.

The cable groove 10 is approximately V-shaped in cross section ( Figure 3a , 3b ). The cable groove thus has two opposite groove surfaces 11, 12. A plurality of facets 13 are provided on each of the two groove surfaces 11, 12. Each facet 13 is concave and extends radially outwards from a groove bottom edge 14 to the lateral surface 8, where it forms an outer boundary edge 15 with it.

In the present exemplary embodiment, each groove surface 11 has ten facets 13, which are arranged one after the other in the circumferential direction. Each facet 13 thus extends in the circumferential direction by an angular range of 36°.

Due to the fact that the facets 13 are concave in shape, they form a clamping edge 16 protruding inwards into the cable groove 10 at the boundary line at which two adjacent facets 13 abut.

In the present exemplary embodiment, the clamping edges 16 are also shaped concavely, with the curvature increasing somewhat in the direction of the groove bottom edge 14 ( Figure 3b ).

Within the scope of the invention, however, the clamping edges 16 can be formed in a straight line. Instead of a groove bottom edge 14, a flat groove bottom can also be provided, which extends a bit transversely to the cable groove 10.

The groove bottom edge 14 is recessed in the area between two adjacent pairs of clamping edges 16 . In the present exemplary embodiment, the groove bottom edge 14 is recessed in the form of an arc.

The drive roller 5 has a central bore 17 for receiving the roller blind shaft 2 in a form-fitting manner. The central bore 17 is a blind bore, which opens out on the side surface 6 of the drive roller 5 ( Figure 3a ).

A radially extending through hole 18 is provided in the area of the groove bottom edge 14 , which opens into the central hole 17 and serves to accommodate a clamping screw 52 . The clamping screw 52 is a worm screw which is arranged in a screw-in sleeve. The drive roller 5 can be fixed to the roller blind shaft 2 with the clamping screw 52 .

In the case of the drive roller 5, a pair of radially extending clamping edges 16 are thus arranged at regular intervals in the circumferential direction in order to be able to clamp a cable 50 with an approximately circular cross section in the cable groove 10 in the unloaded state. Ropes with a circular cross-section in the unloaded state can be braided ropes. In the area between the clamping edges 16, due to the concave design of the facets 13, the cable groove 10 is wider compared to the area of the clamping edges 16, creating a free space in which the cable 50 is loosely accommodated in the cable groove 10 during use without to get stuck in.

The drive roller 5 is made of wood.

In the case of a material such as wood, the facets 13 and the clamping edges 16 can easily be produced by means of milling. Web-shaped projections would be significantly more complex to produce.

This special design of the cable groove 10 by means of the concave facets 13 thus meets the desired mechanical requirements for the drive pulley 5 with regard to the power transmission from the cable 50 to the drive pulley 5 and the release of the clamping connection between the cable 50 and the drive pulley 5, and is also easy to manufacture. The roller blind 1 can therefore be designed without a stripping device for releasing the clamping connection between the cable 50 and the drive roller 5 .

The bearing units 3, 4 each have a bearing block 19, 20. The bearing blocks 19, 20 each have a through hole 21 for receiving the roller blind shaft 2. The bearing block 19 is also formed with a recess 22 for receiving the drive roller 5 ( figure 4 ). The recess 22 is a blind hole with a cylindrical peripheral surface 23 and an approximately circular bottom surface 24.

A through slot 25 through which the cable 50 extends is formed in the area of the cylindrical peripheral surface 23 .

Furthermore, in the area of the cylindrical peripheral surface 23, a through hole 26 is formed for receiving a guide pin 55. The through hole 26 is arranged running approximately horizontally and extends backwards to a rear attachment section 27 of the bearing block 19. The guide pin 55 is used to engage in the guide groove 9, so that the drive roller 5 is fixed in the bearing block 19 in the axial direction with little play.

The bearing block 19 has a further recess 28 ( figure 4 ) to accommodate a clamp 29 ( figure 7 ) on. The recess 28 extends around a portion of the through hole 21 and is open to the bottom surface 24 . At one end, the recess 28 is formed with a pivot bearing section 30 that is circular in plan view, and at the other end, the recess 28 has an approximately cuboid widened adjustment area 31, in which an approximately vertical through hole 32 for receiving an adjustment screw 51 opens.

The clamp 29 has, corresponding to the recess 28, at one end a pivot bearing body 33 which is approximately circular in plan view and which is adjoined by a circular arc-shaped clamping section 34 which merges into an approximately cuboid adjusting body 35 at the end remote from the pivot bearing body 33.

The clamp 29 has on its radially inner side of the clamping section 34 a clamping surface 36 which is provided with a clamping lining. In the present exemplary embodiment, the clamping covering is a felt covering. Leather, in particular suede leather, can also be used as the clamping lining.

The clamp 29 fits into the recess 28 in such a way that the pivot bearing section 30 of the recess 28 and the pivot bearing body 33 form a pivot bearing with which the clamp 29 is pivotably mounted in the bearing block 19, so that the clamp 29 can be adjusted by means of the adjusting body 35 and the adjusting screw 51 can be adjusted a bit in the vertical direction. As a result, the clamp 29 is adjusted in the radial direction relative to the roller blind shaft 2 so that its clamping surface 36 rests against the roller blind shaft 2 . It has been shown that by means of the friction lining, a clamping can be set reliably and permanently, in which there is sufficiently high static friction, so that the roller blind shaft 2 can be held securely in every unwinding state of the blind material and yet the sliding friction is so low that Actuating the drive roller 5 the blind fabric can be easily rolled up or down.

The rear fastening section 27 of the bearing blocks 19, 20 is used to mount the bearing units 3, 4 on a wall. In the view from the rear, the bearing blocks 19, 20 each have an approximately rectangular shape, with a recess being formed on the rear side, so that a circumferential web 37 is formed. A substantially planar base 38 is formed in the area of the recess. Furthermore, two vertically running grooves 39 are formed in the area of the base 38 adjacent to the circumferential web 37 . The through hole 26 for receiving the guide pin 55 opens into one of the grooves 39. A mounting plate 40 is fastened to the floor 38 ( figure 2 , 6 ) which is a thin metal plate formed with four lateral horizontal projections 41 . These projections 41 each extend over the grooves 39 so that there is a free space behind the respective projection 41 .

A wall mount bracket 42 ( figure 5 ) has a base plate 43, two upper legs 44 and two lower legs 45. The legs 44, 45 protrude perpendicularly on the base plate 43 and each form a fixing edge 46 running obliquely upwards from the base plate 43. The fixing edges 46 are arranged approximately parallel to one another. The fixing edges 46 may have small teeth. The lower legs 45 have a lower edge that runs flush with the lower edge of the base plate 43 .

The base plate 43 has through holes 48 in order to be able to fasten the wall mounting bracket 42 to a wall by means of screws. Similarly, through holes 49 are formed on the mounting plate 40 in order to attach them to the respective bearing block 19, 20.

The base plate 43 has a horizontally rearwardly projecting tab 47 on the upper edge, in which a threaded hole 56 is formed.

The storage units 3, 4 can thus be hung with the lateral projections 41 of the mounting plate 40 on the legs 44, 45 of the wall mounting bracket 42. The bearing units 3 , 4 are held on the wall mounting brackets 42 by the teeth on the fixing edges 46 of the legs 44 , 45 . The bearing units 3, 4 have a through hole 57 in the area of the rear fastening section at the upper edge area, which is aligned with the threaded hole 56 of the base plate 43 when the bearing units 3, 4 are correctly hung on the respective base plate 43. A clamping screw can then be passed through the through bores 57 of the bearing units 3, 4 and screwed into the threaded bores 56 of the base plate 43 in order to fix the bearing units 3, 4 to the respective base plates 43. The bearing units 3, 4 can be pressed against the legs 44, 45 with a preload with their projections 41 and at the same time full contact between the mounting surface (e.g. wall, ceiling) and the circumferential web 37 of the rear fastening section 27 can be achieved.

The entire fastening arrangement, including the mounting plate 40 and the wall mounting bracket 42, is arranged completely in the bearing blocks 19, 20 in the finally assembled roller blind 1 and is not visible from the outside. This causes a very aesthetic appearance of the blind.

Furthermore, all mechanical functional parts, such as the clamp 29, the guide pin 55 and various screws are arranged within the bearing blocks 19, 20 and are not visible from the outside. The sole exception to this is the countersunk clamping screw in the bearing units 3, 4, which belongs to the threaded bore 56 and is the only mechanical element that is directly visible from the outside. The adjusting screws 51, the guide pins 55 and the clamping screws 52 are designed as (grub) screws that are concealed in the bores and do not protrude beyond the bearing unit 3, 4.

The clamping screw 52 ( figure 2 ) can be inserted from below through the through-slot 25 into the through-bore 18 of the drive roller 5, so that the bearing block 19 of the bearing unit 4 does not have to have an additional opening for receiving the clamping screw 52.

The bearing block 20 of the non-driven bearing unit 3 is provided with a guide roller 53 which essentially corresponds to the drive roller 5 but has no cable groove. The bearing block 20 is designed essentially the same as the bearing block 19 of the driven bearing unit 4 . The bearing block 20 differs from the bearing block 19 in that it has no through slot 25 and is provided with a further through hole 54 through which the clamping screw 52 can be inserted into the guide roller.

The roller blind 1 is thus not only made of natural raw materials and metal parts, but also forms an attractive body, with the surface of the bearing units 3, 4 being made of wood.

The roller blind shaft 2 is preferably a tube made of aluminum or an aluminum alloy. In principle, it could also be a wooden shaft. However, wood has the problem of creep under sustained loading. A wooden shaft would have to be of correspondingly large dimensions in order to be able to withstand deformation by creeping in the long term.

In principle, other materials for the roller blind shaft 2 can also be considered, in particular fiber-reinforced composite materials, in particular carbon fiber or glass fiber reinforced composite materials or thin-walled steel tubes made, for example, from rustproof alloys or with anti-corrosion surface treatment such as chrome plating.

The rope 50 forms an endless loop. The rope 50 is preferably a braided rope, in particular a rope braided from natural fibers such as hemp fibers. During production, a strand of such a rope is spliced at both of its ends, and the rope should not be thickened or stiffened at the connection point created by the splicing.

In the embodiment explained above, the storage units 3, 4 are mounted on a vertical wall. In the context of the invention, the blinds 1 can also be mounted be formed on a building ceiling. In this case, the through-slot 25 is to be formed on the arcuate area of the driven bearing block 19 so that the cable 50 can hang vertically downwards. Furthermore, fixing the end position of the wall mounting bracket 42 and the mounting plate 40 to one another by means of the clamping screw engaging in the threaded hole 56 is particularly important for ceiling mounting. As a result, the teeth on the legs 44, 45 of the wall mounting bracket 42 can also be omitted, which are then only used for temporary positioning until the clamping screw is tightened.

If the bearing units 3, 4 are not designed for ceiling mounting, then the through hole 57 on the bearing units 3, 4 can also be omitted, since then the bearing units 3, 4 can also be fixed to the wall mounting bracket 42 solely by their weight.

Furthermore, it may be useful to provide one or more intermediate storage for long blinds with a roller blind shaft with a length of e.g. 3 m or more, which is designed similarly to the bearing blocks, but is slightly narrower in shape and has no role, but only the storage of the Roller shaft is used. <b><u>Reference Character List</u></b> 1 roller blind 30 pivot bearing section 2 roller shaft 31 adjustment range 3 storage unit 32 through hole 4 storage unit 33 swivel bearing body 5 drive roller 34 clamping section 6 side face 35 calibration block 7 side face 36 clamping surface 8th lateral surface 37 surrounding footbridge 9 guide groove 38 Floor 10 rope groove 39 groove 11 groove surface 40 mounting plate 12 groove surface 41 head Start 13 facet 42 wall mount bracket 14 groove bottom edge 43 base plate 15 outer boundary edge 44 upper thigh 16 clamping edge 45 lower thigh 17 central hole 46 fixing edge 18 through hole 47 tab 19 bearing block 48 through hole 20 bearing block 49 through hole 21 through hole 50 Rope 22 recess 51 adjustment screw 23 cylindrical peripheral surface 52 clamping screw 24 circular floor area 53 leadership role 25 through slot 54 through hole 26 through hole 55 pilot 27 rear attachment section 56 threaded hole 28 recess 57 through hole 29 clamp

Claims (15)

Drive roller (5) for a roller blind (1). a circular disc-shaped body with two side surfaces (6, 7) and a lateral surface (8) and a peripheral cable groove (10) opening out on the lateral surface (8) for receiving a cable (50), wherein the cable groove (10) has an approximately V-shaped cross section with two groove surfaces (11, 12) lying opposite one another and the groove surfaces (11, 12) have a plurality of concave facets (13) which abut each other in the circumferential direction and thus form clamping edges (16) running approximately radially. Drive roller (5) according to claim 1,
characterized,
that the cable groove (10) is concave at least in the area of the clamping edges (16). Drive roller (5) according to claim 1 or 2,
characterized,
that the clamping edges (16) have a concave shape and tangents at the radially inner end of the clamping edges (16) enclose an angle with the vertical which is at least 10° larger than a corresponding angle of a tangent at the radially outer end of the clamping edges (16). Drive roller (5) according to one of Claims 1 to 3,
characterized,
that the drive roller (5) has a central bore (17) which opens out at least on one of the two side surfaces (6, 7) and is designed to receive a section of a roller blind shaft (2). Drive roller (5) according to claim 4,
characterized,
that the drive roller (5) has a through hole (18) in the area of the cable groove (10) has, which opens in the central bore (17) and is designed to receive a clamping screw (52). Drive roller (5) according to one of Claims 1 to 5,
characterized,
that a guide groove (9) is provided circumferentially and parallel to the cable groove (10). Drive roller (5) according to one of Claims 1 to 6,
characterized,
that the drive roller (5) is made of wood. Drive roller (5) according to one of Claims 1 to 7,
characterized,
that the roller blind (1) is provided as a roller shutter for windows or as a privacy screen inside and/or outside of a building. Bearing unit (3, 4) for a roller blind shaft (2),
characterized,
that the bearing unit (3, 4) has a bearing block (19, 20) with a through hole (21) for receiving the roller blind shaft (2), which is mounted therein with little play, with an arcuate clamp (29) adjacent to the roller blind shaft (2) is arranged, which has a friction lining, in particular a felt lining, on a clamping surface (36) pointing to the roller blind shaft (2) and can be adjusted in the radial direction with respect to the roller blind shaft (2) by means of an adjusting device, so that a frictional resistance between the roller blind shaft (2) and the clamping surface (36) is adjustable. Storage unit (3, 4) according to claim 9,
characterized,
that the clamp (29) is mounted pivotably in the bearing block (19, 20) at one end and is acted upon by the adjusting device at the other end. Storage unit (3, 4) according to claim 9 or 10,
characterized,
that the bearing block (19, 20) is designed with a recess (22) in the form of a blind hole for receiving a drive roller (5), the recess (22) being arranged concentrically with the through bore (21) for receiving the roller blind shaft (2) and having an approximately cylindrical Peripheral surface (23) and an approximately circular bottom surface (24) is formed, and in the region of the peripheral surface (23) a through slot (25) is formed, which is formed transversely to the axis of the through bore (21). Storage unit (3, 4) according to claim 11,
characterized,
that the drive roller (5) is designed according to one of claims 1 to 8. Storage unit (3, 4) according to claim 11 or 12,
characterized, that the bearing block (19, 20) has a through hole (26) in the area of the peripheral surface (23) of the blind hole-shaped recess (22) for receiving a guide pin (55), which can engage in a guide groove (9) of the drive roller (5), and or that the bearing block (19, 20) has a mounting plate (40) with horizontal projections (41) for wall mounting, and in the bearing block (19, 20) vertically running grooves (39) are formed in the area of the projections (41), so that the Bearing block (19, 20) with the projections (41) of the mounting plate (40) can be hung on legs (44, 45) protruding obliquely upwards from a wall mounting bracket (42). Storage unit (3, 4) according to claim 13,
characterized,
that the wall mounting bracket (42) has a base plate (43) for mounting on a wall, on which the legs (44, 45) are formed, the legs (44, 45) preferably on a fixing edge (46) on which the projections (41) of the mounting plate (40), is designed with teeth and/or has a tab (47) with a threaded bore (56) into which a clamping screw with an abutment in the bearing block (19, 20) can engage in order to rotate the bearing unit ( 3, 4) to be securely fixed in the end position of the assembly. Roller blind (1) with a roller blind shaft (2), which is mounted with its ends in a bearing unit (3, 4), one end of the roller blind shaft (2) being connected to a drive roller (5),
characterized, that the drive roller (5) is designed according to one of claims 1 to 8 and/or one of the two bearing units (3, 4) according to one of claims 9 to 14, a roller blind material that can be rolled up and down is attached to the roller blind shaft (2), and/or a cable (50) without radial thickening is provided for actuating the drive shaft (5).

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