EP3783188B1 - Protective roller for an opening in a building - Google Patents

Description

The invention relates to a protective roller blind for a building opening, with a covering sheet for at least partially covering the building opening, and with a roller blind box for receiving the covering sheet, and with two spaced apart and parallel profile strips as guide rails for a handle profile coupled to the covering sheet. The invention further relates to an electromotive drive device for such a protective roller blind and a modular protective roller blind system for a building opening.

In contrast to a pleated blind (Roman blind) in which a cover sheet is guided and held on bands, such a protective roller blind is wound on a shaft (roller shaft, winding shaft), which is usually rotatably mounted in a roller blind box. The shaft interacts with a spring mechanism, for example, which is prestressed in the unwinding direction (pull-out direction) when the covering sheet is unrolled as intended.

Protective blinds of the type mentioned above are used to protect building openings, such as window or door openings (balcony or patio doors). Such a protective roller blind is designed, for example, as a frame system with the roller blind box and two lateral guide profiles. The covering membrane guided between the guide profiles or profile rails should cover the building opening as completely as possible.

It is desirable here to have the most flexible adaptation possible to different opening sizes and to different boundary conditions found on site. Furthermore, it is desirable that the frame or protective roller blind assembly be as unproblematic as possible.

It is possible, for example, for the cover sheet to be adjustable into a desired position by means of an electric drive device. In other words, electric motor actuation is made possible with such protective roller blinds. In this case, the drive device is often integrated in the roller blind box, the flexibility and adaptability of the protective roller blind being disadvantageously reduced by the integration of the drive device. In particular, the adaptability to different opening sizes of the building opening is disadvantageously restricted.

The EP 0 911 479 A2 discloses a device for operating vertical flexible doors having a roll-up tube internally provided with means for inserting a geared motor and a spring-loaded compensating member, the tube being provided with means for connection to a coupling member and means for quick connection of a cover sheet.

From the U.S. 2011/203754 A1 a method for manual and/or remote control of a motorized roller shutter is known, which comprises a roller shutter fixed to a roller shutter tube, a DC geared motor arranged in the roller shutter tube and a microcontroller.

In the U.S. 2018/023340 A1 describes a mounting assembly for attaching a hollow shaft to a support structure of a bracket.

The invention is based on the object of specifying a particularly suitable protective roller blind for a building opening. In particular, a protective roller blind with an electromotive drive device is to be specified, which can be adapted as flexibly as possible to different building openings and general conditions. The invention is also based on the object of specifying a particularly suitable electromotive drive device for such a protective roller blind and a particularly suitable protective roller blind modular system with such a protective roller blind.

With regard to the protective roller blind, the object is achieved according to the invention with the features of claim 1 and with regard to the drive device with the features of claim 8 and with regard to the protective roller blind modular system with the features of claim 10 . Advantageous refinements and developments are the subject of the dependent claims. The advantages and configurations listed with regard to the protective roller blind can also be transferred to the drive device and/or the protective roller blind modular system and vice versa.

The protective roller blind according to the invention is suitable and set up for installation in a building opening, in particular in a window opening or a door opening. In this case, the protective roller blind has a covering sheet in the form of a roller blind cloth or roller blind fabric, by means of which the building opening can be at least partially covered.

The cover sheet is preferably designed as a protective fabric, in particular as a particle, insect or pollen protection fabric, or as a visual or sun protection fabric. In the case of an embodiment as a particle, insect or pollen protection fabric, the cover sheet is designed in particular as a mesh fabric (insect protection mesh). In the case of an embodiment as a sun or privacy protection fabric, the covering web is preferably designed to be optically non-transparent or non-transparent.

The protective roller blind also has a roller blind box or a roller blind cassette for accommodating the covering sheet. In particular, it is possible for the cover sheet to be arranged essentially completely in the roller blind case for an opening of the protective roller blind or the building opening. As a result, the covering membrane is reliably protected from external influences.

The protective roller blind has two mutually spaced and parallel profile strips as guide rails for a handle profile (end strip, pull-out strip) coupled to the cover sheet. The profile strips and the roller blind box here form a mountable or mounted frame system of the protective blinds. When assembled, the profile strips are arranged as vertical longitudinal profiles on the sides of the building opening, i.e. on the reveal or frame, with the roller blind box being arranged as a horizontal transverse profile on an upper edge of the building opening, i.e. in the area of the lintel. The roller blind box has an open (longitudinal) slot in the mounted state, ie facing the profile strips or the ground, via which the covering sheet with the handle profile can be pulled out manually along the guide of the profile strips.

The protective roller blind according to the invention also has an electromotive drive device which is integrated in the roller blind box, ie is installed in the roller blind box. The electrical or electromotive drive device is suitable and set up to adjust the covering web along an unwinding direction or pull-out direction, which is essentially oriented along the profile strips.

The approximately cylindrical drive device has an electromotive tubular motor and a spring shaft as well as a hollow shaft that can be lengthened (hollow winding shaft). The hollow shaft is provided with an inner contour in which the tubular motor and the spring shaft, designed for example as a helical spring, each engage with a counter-contour. The tubular motor and the spring shaft engage in the hollow shaft from opposite end faces in a form-fitting and non-rotatable manner. In other words, the hollow shaft is rotatably or rotatably mounted by means of the spring shaft and the tubular motor. As a result, a particularly suitable protective roller blind is realized.

A "positive fit" or a "positive connection" between at least two parts connected to one another is understood here and in the following in particular to mean that the parts connected to one another are held together at least in one direction by direct interlocking of the contours of the parts themselves or by indirect interlocking about a additional connecting part takes place. The "blocking" of a mutual movement in this direction is therefore due to the shape.

Due to the hollow shaft that can be cut to length, the protective roller blind or the drive device can be individually adapted to different window or door dimensions, so that the protective roller blind can be flexibly mounted on or in practically all common building openings. Appropriately, the roller blind box and the cover strip are also designed so that they can be cut to length.

The design with the tubular motor and spring shaft inserted, pushed or plugged into the hollow shaft results in a structurally simple drive device that can be cut to length. Since the tubular motor and the spring shaft are used on opposite end faces of the hollow shaft, the counter-contours within the hollow shaft are essentially spatially spaced apart from one another, ie a hollow or intermediate space is formed between the counter-contours. The tubular motor and the spring shaft are thus coupled to one another only indirectly via the hollow shaft. This makes it possible to dimension or change the overall length of the drive device by means of a comparatively simple and cost-reduced lengthening of the hollow shaft.

The counter-contour of the tubular motor is expediently coupled to its rotor in a rotationally fixed manner, so that when the rotor rotates, the hollow shaft—and thus the spring shaft—are rotated. The inner contour and the counter-contours are thus designed as joining contours that engage in one another in a form-fitting and non-rotatable manner. In other words, the tubular motor and the spring shaft are coupled in terms of drive technology by means of the hollow shaft.

Since the drive-related coupling is only effected by the interlocking contours within the hollow shaft, the quality of the cut edges during the cutting to length of the hollow shaft is not critical. This further improves the flexibility of the protective blind.

The approximately cylindrical or bolt-shaped tubular motor has an axial size that is larger than its radial size. In other words, the tubular motor has a comparatively low (radial) axis height and a comparatively long (axial) overall length, in particular the overall length is many times greater than the axis height.

The spring shaft and the tubular motor are seated essentially completely in the hollow shaft when they are joined or assembled. In other words, the spring shaft and the tubular motor are essentially fully inserted or pushed into the hollow shaft at the opposite end faces. The hollow-cylindrical or tubular hollow shaft extends essentially over the full (horizontal) length of the roller blind box. The tubular motor, the spring shaft and the hollow shaft are arranged coaxially to one another.

The spring shaft is preferably embodied as a spring mechanism which is mechanically pretensioned when the covering web is unrolled or unwound along the unwinding direction. The tubular motor suitably has a static holding moment, which holds the cover web in the unwound state against the pretension. In other words, the tubular motor acts as a blocking or arresting and/or braking means, which prevents an unintentional, abrupt hitting or winding up of the covering web due to spring force-induced rolling up. This means that essentially no additional locking or blocking means are provided for the drive device. The spring mechanism supports the tubular motor when the covering sheet is rolled up. As a result, the tubular motor can be dimensioned comparatively small with regard to the torque required, and is therefore particularly cost-effective.

To actuate the drive device or the tubular motor, it is possible, for example, for the drive device to have a transceiver for sending and receiving wireless signals. This makes it possible, for example, to couple the drive device to an operating element, such as a radio remote control, and by means of this easy to operate. This significantly improves the user comfort of the protective roller blind.

The operating element can also be designed, for example, as a mobile phone, in particular as a mobile phone with a computer function or as a smartphone, or also as a tablet computer. The operating element has, for example, stored application software (operating software) for controlling the drive device. For this purpose, the application software (application software) can preferably be installed or installed on the control element as a so-called app or mobile app (mobile application, smartphone app).

In an advantageous embodiment, the tubular motor has a shorter overall axial length than the spring shaft in relation to a longitudinal direction of the hollow shaft (axial direction). As a result, a particularly space-compact tubular motor is realized.

In a suitable development, the drive device has a chargeable electrical energy store, for example in the form of an electrochemical accumulator, which is coupled to the tubular motor. In this case, the energy store is integrated in the roller blind box, in particular in the tubular motor. This further improves the flexibility of the protective roller blind, since the drive device can thus be operated essentially independently of a supply network. In other words, no additional mains connection of the drive device is necessary.

In a conceivable embodiment, the energy store can be charged by means of a photovoltaic or solar cell, or a photovoltaic or solar panel. In this case, the photovoltaic cell is expediently arranged on a surface of the roller blind box facing the outside of the building. This enables the energy store to be charged in a particularly cost-effective manner and with reduced effort.

The energy store integrated in particular in the tubular motor expediently has a charging interface for electrically conductive coupling to the photovoltaic cell. The charging interface is designed as a USB-C socket, for example, so that the energy storage device can also be connected to a mobile auxiliary battery (power bank) for charging, if required, for example when it is cloudy.

In a preferred embodiment, the counter-contour of the spring shaft and/or the tubular motor has a driver head with radial ribs distributed in the circumferential direction, which in the assembled state lie against the inner wall side, for example with a force fit or friction fit, in the inner contour. The driver head of the counter-contour is thus connected to the hollow shaft on the inner wall side in a form-fitting manner, practically fixed to the latter. This ensures a particularly stable and non-rotatable drive coupling of the spring shaft and/or the tubular motor to the hollow shaft.

The conjunction "and/or" is to be understood here and in the following in such a way that the features linked by means of this conjunction can be designed both together and as alternatives to one another.

A "positive connection" or a "positive connection" between at least two parts connected to one another is understood here and in the following in particular to mean that the parts connected to one another are prevented from sliding off one another due to a frictional force acting between them. If there is no "connection force" that causes this frictional force (this means the force that presses the parts against one another, for example a screw force or the force of weight itself), the non-positive connection cannot be maintained and can therefore be released.

According to the invention, the roller blind box has a cover cap on each of its opposite end faces. The lateral cut edges of the roller blind box, which can preferably be cut to length, can thus be covered in a visually attractive manner by means of the covering cap. The cover caps are each with one along the longitudinal direction the hollow shaft is provided with an axially projecting joining contour, by means of which the spring shaft or the tubular motor is held in the roller blind box in a stationary or non-rotatable manner.

According to the invention, the joining contour for the spring shaft is designed as an axial journal, onto which the spring shaft is placed in a non-positive or frictional manner. A rotatably mounted shaft bushing for the hollow shaft is arranged on the spring shaft in the area of the axial journal. As a result, on the one hand a structurally simple and cost-reduced, stationary and non-rotatable mounting of the spring shaft and on the other hand a stable, rotatable mounting of the hollow shaft in the roller blind box are realized.

In a suitable embodiment, the joining contour for the tubular motor is designed as an axial joining pin, which engages in a form-fitting manner in a joining receptacle of the tubular motor. This ensures a simple and reliable stationary and non-rotatable mounting of the tubular motor in the roller blind box.

The electromotive drive device according to the invention is suitable and set up for a protective roller blind as described above. In this case, the drive device has an electric or electromotive tubular motor and a spring shaft as well as a hollow shaft that couples these to one another in terms of drive technology. According to the invention, the hollow shaft can be cut to length and is provided with an inner contour in which the tubular motor and the spring shaft engage in a form-fitting and non-rotatable manner by means of counter-contours on opposite end faces of the hollow shaft. As a result, a particularly suitable drive device is realized. In particular, a particularly flexible and easily adaptable drive device is thus realized.

An additional or further aspect of the invention provides that the protective roller blind described above or the drive device described above are part of a modular protective roller blind system. The protective roller blind modular system is provided as an assembly set according to the modular principle, in particular as a DIY assembly set (do-it-yourself), for individual adjustment to different window or door dimensions, so that the system can be flexibly adapted to practically all common building openings.

This means that, for example, the roller blind box and the drive device as well as the profile strips and the covering sheet are each manufactured in just one or in as few different standard sizes as possible, and a consumer can put together an individual protective roller blind or frame system for the respective building opening. As a result, the flexibility of the protective roller blind that can be mounted as a result is increased in a simple and advantageous manner and thus an adaptation to different boundary conditions for the mounting found on site is made possible. For this purpose, in particular the roller blind box, the drive device or the hollow shaft, the profiled strips, the handle profile, and the covering sheet are designed to be cut to length. This further increases the flexibility of the protective roller blind modular system and, for example, simplifies its use in old buildings with variable opening dimensions. The cut edges of the roller blind box can preferably be covered in a visually attractive manner by means of a cover cap that can be placed on the front side. The profile strips also have, for example, a covering cap on the substrate side in the assembled state in the form of a base for covering the cut edges.

The profile strips and the roller blind box as well as the handle profile are preferably metal profiles that can be cut to length, for example made of aluminum. Their cross section is preferably essentially rectangular. However, square or rounded designs are also conceivable.

Fig. 1

ein Schutzrollo mit einer entlang zweier Profilleisten geführten Abdeckbahn und mit einem Rollokasten,

Fig. 2

in Perspektive den Rollokasten mit zwei stirnseitigen Abdeckkappen,

Fig. 3

in einer Schnittdarstellung entlang der Linie III-III in Fig. 2 den Rollokasten mit einer darin integrierten Antriebsvorrichtung mit einem Rohrmotor und mit einer Federwelle sowie mit einer Hohlwelle,

Fig. 4

in einer Schnittdarstellung entlang der Linie IV-IV in Fig. 2 ein Hohlprofil des Rollokastens,

Fig. 5

in perspektivischer Explosionsdarstellung eine erste Rahmenecke des Schutzrollos,

Fig. 6

in perspektivischer Explosionsdarstellung eine zweite Rahmenecke des Schutzrollos,

Fig. 7

in perspektivischer Darstellung eine Abdeckkappe mit einer Fügekontur,

Fig. 8

in perspektivischer Darstellung den Rohrmotor mit einer Fügeaufnahme,

Fig. 9

ein Hohlprofil der Hohlwelle,

Fig. 10

eine Gegenkontur der Federwelle, und

Fig. 11

eine Wellenbuchse der Federwelle.

An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. Show in it:

1

a protective roller blind with a cover strip guided along two profile strips and with a roller blind box,

2

in perspective the roller blind box with two end caps,

3

in a sectional view along the line III-III in 2 the roller blind box with an integrated drive device with a tubular motor and with a spring shaft and with a hollow shaft,

4

in a sectional view along the line IV-IV in 2 a hollow profile of the roller blind box,

figure 5

in a perspective exploded view a first corner of the frame of the protective blind,

6

a perspective exploded view of a second corner of the frame of the protective blind,

7

a perspective view of a cover cap with a joining contour,

8

a perspective view of the tubular motor with a joint mount,

9

a hollow profile of the hollow shaft,

10

a counter-contour of the spring shaft, and

11

a shaft bushing of the spring shaft.

Corresponding parts and sizes are always provided with the same reference symbols in all figures.

The 1 shows a front view of a protective roller blind 2 with a roller blind box 4 and profile strips 6 arranged laterally thereon. The covering sheet 10 is held on the one hand at the web end on the handle profile 8, for example by means of a welt, and on the other hand at the web end is wound onto a hollow shaft (winding shaft, roller blind shaft) 12 that can be cut to length ( 3 ).

The profile strips 6 can be screwed to a reveal or frame of a building opening by means of three fastening elements 14 each.

The cover sheet 10 is, for example, a particle, insect or pollen protection fabric (insect screen). The cover strip 10 can also be a visual or sun protection fabric or the like.

the inside 2 roller blind box 4 shown individually is closed at the front in the area of the connection of the respective profile strip 6 by means of a respective detachable cover cap 16, 18.

Like in the 4 can be seen comparatively clearly, the roller blind box 4 is designed as a profile strip with a hollow profile. The roller blind case 4 here has an approximately rectangular cross-sectional shape, with a screw receptacle 20 being arranged in each of the inside corner regions, into which fastening screws (not specified) for fixing the cover caps 16, 18 can be screwed. The roller blind case 4 has an inner chamber 22 for accommodating a drive device 24 ( 3 ) and the covering membrane 10. The inner chamber 22 is opened in the longitudinal direction by means of a profile longitudinal slot 26 toward an underside facing the handle profile 8 . On the side (upper side) of the roller blind box 4 opposite the profile longitudinal slot 26 there is a joining chamber 28 for receiving an approximately strip-shaped sealing element (sealing brush), not shown in any more detail.

Below is the drive device 24 based on the Figures 3 , 5 and 6 explained in more detail. The approximately cylindrical drive device 24 is integrated into the roller blind box 4 . The drive device 24 has a tubular motor 30 and a spring shaft 32 and the hollow shaft 12, which are arranged coaxially to one another.

The spring shaft 32 is designed as a spring mechanism which, when the cover sheet 10 is unwound manually or by an electric motor along a vertical unwinding direction (pull-out direction) A from the hollow shaft 12, prestresses the latter and thus the cover sheet 10 in the opposite direction or in the winding direction (pull-in direction) B in a spring-elastic manner. The spring shaft 32 supports the tubular motor 30 when winding up the covering membrane 10.

Like in the 6 shown, the spring shaft 32 has, for example, two spring elements 34, 36 designed as helical springs, which are mechanically coupled by means of a torsion bar 38 arranged between them.

The outside spring element 34 sits on an axial joining contour 40 of the covering cap 18 in the assembled state. The joining contour 40 is designed as an approximately cylindrical or bolt-shaped axial pin. The spring element 34 is placed or plugged onto the joining contour 40 in particular in a rotationally fixed or stationary manner.

the inside 8 Tubular motor 30, shown individually, has on its outside end face 42 a joining receptacle 44 for a joining contour 46 in 7 shown cap 16 on. The joining contour 46 is designed as an axial joining pin with an approximately star-shaped cross-section, which positively engages in the complementarily shaped joining receptacle 44 . In the assembled or joined state, the tubular motor 30 is thus held on the cover cap 16 in a stationary and non-rotatable manner.

The handle profile 8 is - as in particular in the 6 visible - designed as a hollow profile, wherein in the assembled state an elongated, approximately bar-shaped weight 48 is arranged in the handle profile 8 to keep the covering sheet 10 under tension in the unwound or extended state. The handle profile 8 is laterally displaceable and stable in the profile strips 6 by means of two slides 50 . The profile strips 6 here have an open receiving chamber 52 as a hollow profile, in which the respective slide 50 is seated in a form-fitting manner.

The receiving chamber 52 or the profile strips 6 are open towards the inside of the protective blind 2 . Opposite this opening, a groove-like receptacle 54 is provided on the outside of the profile strips 6, into which a respective joining tab 56 of the cover caps 16, 18 can be inserted. The joining tabs 56 are, for example, screw-fastened to the profile strips 6 in the assembled or joined state.

Like in the 9 As can be seen, the approximately tubular or hollow-cylindrical hollow shaft 12 has a hollow profile in the form of an inner contour 58 . In the exemplary embodiment shown, the inner contour 58 has eight radially inwardly projecting contours Run ribs 60, which are arranged evenly distributed on the inner circumference of the hollow shaft 12. The ribs 60 are provided with reference numbers in the figures merely by way of example.

When the protective roller blind 2 or the drive device 24 is assembled or joined, the tubular motor 30 and the spring shaft 32 as well as the hollow shaft 12 are arranged coaxially with one another; in particular, the tubular motor 30 and the spring shaft 32 - as for example in 3 can be seen - essentially completely pushed into the hollow shaft 12 on opposite end faces.

The tubular motor 30 and the spring shaft 32 are drivingly coupled via the hollow shaft 12 . For this purpose, the tubular motor 30 and the spring shaft 32 each have a counter-contour 62 , 64 shaped to complement the inner contour 58 .

Like in the 3 As can be seen comparatively clearly, the tubular motor 30 has smaller axial dimensions than the spring shaft 32 along the longitudinal direction of the drive device 24 or the hollow shaft 12 . In other words, the tubular motor 30 is shorter than the spring shaft 32 .

The structure of the counter-contours 62, 64 is explained below by way of example using the counter-contour 64 of the spring shaft 32. The counter-contour 64 has a driver head 66 with radial ribs 68 distributed in the circumferential direction. The radial ribs 68 project radially up the outer circumference of the driver head 66 and run axially along the driver head 66 .

In the joined state, the radial ribs 68 rest against the inner contour 58 on the inner wall side, for example in a non-positive or frictional manner. The radial ribs 68 here engage in particular in the intermediate spaces 70 formed between the ribs 60 in a form-fitting and non-rotatable manner. The driver head 66 of the counter-contour 64 is thus positively connected to the hollow shaft 12 on the inner wall side, practically fixed to the shaft.

A joining pin 72 is formed on the driver head 66 of the counter-contour 64, on which the spring element 36 of the spring shaft 32 is placed in a rotationally fixed manner. Here, the driver head 66 of the counter-contour 62 is expediently coupled to a rotor of the tubular motor 30 .

The hollow shaft 12 is rotatably held between the cover caps 16, 18 by means of the spring shaft 32 on the one hand and by means of the tubular motor 30 on the other hand. A shaft bushing 74 at the end is placed on the spring element 34 to reduce friction and to improve the support and bearing of the hollow shaft 12 .

In the 11 The shaft bushing 74 that is shown individually and is roughly sleeve-like has a central feed-through opening 76 for the spring element 34 and the joining contour 40 . The feed-through opening 76 has a smooth inner wall, so that the frictional resistance of the shaft bushing 74 is as low as possible when the hollow shaft 12 rotates on the spring element 34 . The shaft bushing 74 has radial ribs 76 on the outside, which correspond to the radial ribs 68 of the counter-contours 62, 64. In the assembled state, the shaft bushing 74 is thus seated in the hollow shaft 12 in a rotationally fixed and form-fitting manner.

An energy store, not shown in detail, in the form of a chargeable accumulator is suitably integrated into the tubular motor 30 . In this case, the energy store is connected to a photovoltaic cell (not shown) or to a photovoltaic panel.

The protective roller blind 2 is preferably designed as an assembly set based on the modular principle, ie as a protective roller blind modular system for individual adaptation to different window or door dimensions.

The roller blind box 4 and the drive device 24 as well as the profile strips 6 and the cover sheet 10 as well as the handle strip 8 are each manufactured in only one standard size or in only as few different standard sizes as possible, so that a consumer can put together an individual protective roller blind for the respective building opening.

The profile strips 6 and the roller blind box 4 and the handle profile 8 are preferably metal or hollow profiles that can be cut to length, for example made of an aluminum material. The length of the drive device 24 can be varied in particular by the hollow shaft 12 that can be cut to length, the hollow shaft 12 being designed, for example, as a metallic extruded part made of an aluminum material. The counter-contours 62, 64 and the shaft bushing 74 and the covering caps 16, 18 are produced, for example, as injection molded parts, for example made of a polyamide material.

To assemble the protective roller blind 2, the roller blind box 4 and the hollow shaft 12 as well as the profile strips 6 and the cover sheet 10 and the handle strip 8 are first cut or cut to the desired length adapted to the dimensions of the respective building opening.

The drive device 24 is then installed and the cover strip 10 is connected to the hollow shaft 12 and the handle profile 8 . The drive device 24 and the cover strip 10 are inserted into the inner chamber 22 via the open end faces of the roller blind box 4 and/or the longitudinal profile slot 26 and are thus integrated into the roller blind box 4 . The drive device 24 is then fixed laterally in the roller blind box 4 by means of the cover caps 16, 18, the cover caps 16, 18 being screw-fastened to the roller blind box 4 via the screw receptacles 20.

The cut edges of the profile strips 6 are covered on the underground side with a base 78 as a cap. Opposite the feet 78, the respective joining bracket 56 is inserted into the receptacle 54 and screwed there. Finally, the protective roller blind 2 is fastened from the inside via the receiving chamber 52 with the fastening elements 14 to the building opening securely and without shaking.

The invention is not limited to the exemplary embodiments described above. On the contrary, other variants of the invention can also be derived from this by a person skilled in the art without departing from the subject matter of the invention. In particular, all of the individual features described in connection with the exemplary embodiments can also be combined with one another in other ways within the scope of the disclosed claims, without departing from the subject matter of the invention.

Reference List

2

protective roller blind

4

roller blind box

6

profile bar

8th

handle profile

10

cover sheet

12

hollow shaft

14

fastener

16

cover cap

18

cover cap

20

screw mount

22

inner chamber

24

drive device

26

profile slot

28

joining chamber

30

tubular motor

32

spring shaft

34

spring element

36

spring element

38

torsion bar

40

joining contour

42

face

44

joining recording

46

joining contour

48

Weight

50

slider

52

recording chamber

54

Recording

56

joint tab

58

inner contour

60

rib

62

counter contour

64

counter contour

66

driving head

68

radial rib

70

space

72

joining spigot

74

shaft bushing

76

radial rib

78

stand

A

unwind direction

B

winding direction

Claims (7)

1. Protective roller blinds (2) for an opening in a building, having

   - a covering sheet (10) for at least partly covering the opening in the building, and

   - a roller blind box (4) for receiving the covering sheet (10), and also

   - two profile strips (6) extending at a distance from and parallel to each other as guide rails for a handle profile (8) coupled to the covering sheet (10),

   - wherein an electromotive drive device (24), with which the covering sheet (10) is adjustable along an unwinding direction (A), is integrated in the roller blind box (4),

   - wherein the drive device (24) has an electromotive tubular motor (30) and a spring shaft (32) and a hollow shaft (12) that can be cut to length,

   - wherein the spring shaft (32) has two spring elements (34, 36), which are coupled mechanically by means of a torsion rod (38) arranged between them,

   - wherein the hollow shaft (12) has an internal contour (58), in which the tubular motor (30) and the spring shaft (32) engage in a form-fitting and co-rotational manner by means of mating contours (62, 64) on opposite end faces of the hollow shaft (12),

   - wherein the roller blind box (4) has a covering cap (16, 18) on each of its opposite end faces, each of which is provided with an axial joining contour (40, 46) for the co-rotational holding of the spring shaft (32) and the tubular motor (30) respectively,

   - wherein the joining contour (40) for the spring shaft (32) is formed as an axial pin, onto which the spring shaft (32) is placed with a force fit or frictional fit, and

   - wherein a shaft bush (74) for the hollow shaft (12) is rotatably mounted on the spring shaft (32) in the region of the axial pin (40).
2. Protective roller blind (2) according to Claim 1, characterized in that
   the tubular motor (30) has a lower axial overall length than the spring shaft (32) in relation to the longitudinal direction of the roller blind box (4).
3. Protective roller blind (2) according to Claim 1 or 2,
   characterized in that
   the drive device (24) has a rechargeable electric energy store, which is coupled to the tubular motor (30).
4. Protective roller blind (2) according to Claim 3, characterized in that
   the energy store can be charged by means of a photovoltaic cell.
5. Protective roller blind (2) according to one of Claims 1 to 4,
   characterized in that
   the mating contour (62, 64) of the spring shaft (32) and/or of the tubular motor (30) has a driver head (66) with radial ribs (68) distributed in the circumferential direction.
6. Protective roller blind (2) according to one of Claims 1 to 5,
   characterized in that
   the joining contour (46) for the tubular motor (30) is formed as an axial joining pin, which engages in a form-fitting manner in a joining receptacle (44) in the tubular motor (30).
7. Protective roller blind subassembly system for installation in an opening in a building, having a protective roller blind (2) according to one of Claims 1 to 6.

Images