EP3708762B1

EP3708762B1 - Anti-burglary mechanism for roller shutters and method thereof

Info

Publication number: EP3708762B1
Application number: EP20155506.7A
Authority: EP
Inventors: Miran Kramar
Original assignee: Roletarstvo Medle d o o
Current assignee: Roletarstvo Medle d o o
Priority date: 2019-03-13
Filing date: 2020-02-04
Publication date: 2022-11-16
Anticipated expiration: 2040-02-04
Also published as: SI25575A; HRP20221456T1; EP3708762A1; RS63925B1

Description

Subject of the invention

The subject of the invention is an anti-burglary mechanism for roller shutters and the method thereof or more precisely, a mechanism for blocking slats of a closed or partially open roller shutter or insect screen on windows or doors, whereby the shutter slats will make it possible to block closed or partially open roller shutters in three fixed positions in regards to the lower part of the window, door or insect screen.

Technical problem

A technical problem to be solved by this invention is an indication of an anti-burglary mechanism for roller shutters and of a method thereof, that will make it possible to block a closed or partially open roller shutter at three blocking positions that will be positioned at such a small distance between the end slat and the window sill or the door threshold that will prevent unwanted entry of the persons into the living space of a building. Thereby, a partially open roller shutter will be secured also in the position of ventilation when the slats are spaced apart. Furthermore, the construction of said anti-burglary mechanism enables its installation into all known types of side guides of the roller shutters without their disassembly, and also enables simple replacement of mechanisms of external concealed roller shutters.
The construction of the anti-burglary mechanism will be simple to manufacture, install and use. In addition, in window, door or insect guides, it will be easy to replace the existing blocking mechanism with the anti-burglary mechanism according to the present invention.

Current state of the art

According to patent document EP 3 246 507A1 , there is known a roller shutter installation comprising a device for locking the roller shutter, which consists of a frame and a mouthpiece with a cursor. The frame is attached, with its resting surface, within the roller shutter side guide, whereby perpendicularly to the resting surface, three elastic curved or serpentine tabs are formed. The upper tab acts as a cursor router in the direction of the intermediate elastic tab below it, while the lower two elastic tabs have the function of blocking, in the sense of blocking the partially open roller shutter in two blocking spots that are made with a distance between them. The weakness and deficiency of this known solution is in the fact that the mechanism can be adjusted in two blocking spots only, which determine the height of the partial opening between the end slat and the lower part of the window or door. Furthermore, weakness and deficiency of this known mechanism is in the fact that it cannot be replaced in case of an external concealed roller shutter as this is prevented by the lower bearer with the supporting element on the frame. Because of these two elements, it is necessary to unscrew and remove the side guides when disassembling the blocking mechanism. Further weakness and deficiency of this blocking mechanism is in the fact that this mechanism can be built in one type of side guides only, their construction depends on the previously mentioned lower bearer with the supporting element on the frame. In other known types of roller shutter side guides, this mechanism cannot be built in, and in such a case the mechanism must be reconstructed to fit a particular guide.
Based on the previously described known solution of the blocking mechanism, i.e. of the system of blocking a roller shutter, the problem of simple and effective anti-burglary mechanism construction without elastic deformable parts on the frame for guiding the movement of the cursor remains unsolved, the production thereof is demanding and their useful life is relatively short as there is a possibility of mechanical damage or of aging of the plastic material they are made of. Furthermore, the problem of forming the blocking or anti-burglary mechanism is still not solved that will enable more than two blocking spots or more than two positions of a closed or partially open roller shutter where a larger height of partial opening during ventilation appears, which increases the risk of unwanted entry of a person into the living space. Moreover, the problem of disassembling and changing of blocking mechanisms in existing roller shutters is still not solved as roller shutter side guides must be dismantled or in some cases changed first. It also remains an unsolved problem of an execution of a blocking mechanism, which will be able to be installed in all types of side guides, and not only in certain types, i.e. side guides adapted to it.

Description of the invention

The invention is defined by an anti-burglary mechanism according to claim 1 and by a method of its operation according to claim 7, that will enable safe setting of the distance between the end slat and the lower part of the door, window or insect screen in three blocking spots. At the same time, its construction will enable an installation of the anti-burglary mechanism in all types of roller shutter side guides, but will also enable its installation and disassembly without the need for prior disassembly of the side guides. The objective of the development was to develop a relatively simple and standard anti-burglary mechanism construction with a blocking function that will ensure high degree of safety when the roller shutter is partially open.
The invention essentially discloses an anti-burglary mechanism for roller shutters with an original construction of a guiding element for guiding the guide pin of a mouthpiece that will be carried out without deformable parts and that will enable anti-burglary blocking of the roller shutter at three blocking spots and at a various distance between the roller shutter end slat and the lower part of the window or door. At the same time the invention discloses a method of anti-burglary mechanism operation of such an innovative structure. Thereby the original guiding element construction along with the mouthpiece discloses the option of installing or replacing the anti-burglary mechanism without previous disassembling of side guides, as well as its characteristic standard assembly, which can be simply installed into all known types of side guides for guiding roller shutter slats.
The shutter is mounted on the outside of windows or doors as a blind, and contains an assembly of winding mechanism with interconnected lamellae that are slidably inserted into the side guides. The shutter can also be mounted above the window or above the door, as an upright or overhead shutter. The following description will introduce the classic or standard shutters.
A roller shutter is mounted outside of windows or doors, and includes an assembly of a winding mechanism with slats that are movably interconnected and that are inserted into two side guides with their ends so that they can slide. The roller shutter can also be mounted above the window or door as above-window or above-door roller shutter. The description below refers to a classical or standard roller shutter.
The anti-burglary mechanism with the blocking function according to the present invention essentially comprises a guiding element and a mouthpiece. The guiding element is formed by a guide plate with guide channels and a slender outgrowth, and a supporting plate that is perpendicular to it and that has a mounting hole to be mounted on the wall of the guide channel of a side guide. The mouthpiece is a flat housing into which a spring with a slider on one side and a guide pin on the other side of it are integrated, whereby the latter can move linearly within the open elongated cut-out. At the elongated cut-out, a protruding sliding plug is carried out.
It applies that one guiding element with a guide plate is built in the corresponding roller shutter side guide and that one mouthpiece is inserted into each corresponding end of the hollow end slat. In this way, in the final phase, an individual roller shutter has two such mechanisms, the guiding elements of which are placed and fixed at the same height, i.e. at the same distance from the lower part of both guides and at the same distance from the lower part of the window or door.
Each guiding element is inserted into the corresponding guide channel of the side guide in the direction of its longitudinal axis so that their longitudinal axes run parallel. The guiding element is attached to the side guide, i.e. to the back wall of its guide channel in a fixed way via mounting hole in the supporting plate so that the guide plate perpendicular to it and with guide channels is positioned on the internal side plane of the guide channel. Thereby the guide plate of the guiding element is in the same plane as the larger surface of the slat roller shutter, whereas the supporting plate is perpendicular to the same larger plane of the roller shutter. The above applies for the left and for the right installation of the guiding element into the corresponding side guide of the roller shutter slats.
The mouthpiece is, at one end where a spring with a slider is located, tightly inserted into the interior of a hollow end slat so that the guide pin in the elongated cut-out is outside said end slat. This applies to both the left and right mounting place of the mouth piece in the end slat.
When manufacturing a roller shutter with the anti-burglary mechanism according to this invention, before assembling it, it is required to insert the corresponding guiding elements into the guide channel of side guides and to attach them in the previously described position in a fixed way. The mouthpiece is inserted into the end slat of the slat set, into both ends, in the previously described position.
With the free ends of both mouthpieces, the end slat is inserted into the guide channels of both side guides so that it, together with them, slides freely along the longitudinal cut-out of both guide channels. The slat set is then positioned within the entire length of the side guides, and it is with the initial slat attached to an unshown shaft of the winding mechanism.
The anti-burglary mechanism with the blocking function for roller shutters according to the invention operates in such a way that the guide pin that slides within and lengthwise of the elongated cut-out on the front part of the mouthpiece forward and backward moves freely along the guide channel of the corresponding side guide of the roller shutter until it reaches the closed guide channel on the guiding element, and it travels further along it in a guided way. When the end slat with the mouthpiece reaches the first blocking spot, the movement of the guide pin of the mouthpiece and thereby the movement of the end slat is stopped and the individual slats above it begin to load on it one after another sequentially, causing the shutter to close and darken the living space.
If it is not desired that the room is darkened as described above, the slats, when the end slat with the guide pin reaches the first blocking spot, are raised so that the guide pin with the end slat reaches the second blocking spot. At this spot, the guide pin and the end slat stop but the remaining slats are still being raised until the slats are not fully stretched out. When the slats are fully stretched out, the raising is stopped. In this position, the slats are stretched by means of the end slat between the second blocking spot and the shaft of the winding mechanism, the electrical motor of which prevents the slats from being pulled downwards. This is the main phase in the operation of the roller shutter with the anti-burglary mechanism, where the slats movably attached to each other are in the stretched position with visible perforated passes that enable the ventilation of the living space. The ventilation runs through the open perforations of the slats, at the same time pulling up or down of roller shutters is disabled in this position. The described second blocking spot also enables a partial opening between the end slat and the lower part of the window or door, the height of which does not make it possible to unwanted persons to enter into the living space. In this way, in addition to the ventilation function, the safety anti-burglary function of the roller shutter is ensured.
In the next phase, the roller shutter slats are released, which means that the mouthpiece with the guide pin and the end slat is moved from the second blocking spot to the third blocking spot. This movement causes that all the slats start moving down until they are placed tightly to each other. Thereby the room is made completely dark and the ventilation phase is over. The electric motor pushes the slats with the end slat towards the lower part of the guiding element by as much to make it impossible to pull them up, which represents an anti-burglary function of the roller shutter also in this case.
The last phase in the operation of the anti-burglary mechanism comprises the release of slats and afterwards their raising in the direction of the winding mechanism. During raising of slats, the guide pin of the mouthpiece travels along the open guide channel of the guiding element until it leaves its conical outgrowth and then further towards the winding mechanism.
In the following, the roller shutter anti-burglary mechanism and the method of its operation according to the present invention are more precisely described, on the basis of a feasibility example of a window roller shutter and figures, which show as follows:

Fig. 1: schematic presentation of a roller shutter with anti-burglary mechanisms
Fig. 2: partial cross-section of a side guide of the roller shutter slats with a fixed observed anti-burglary mechanism, isometric projection
Fig. 3: anti-burglary mechanism assembly comprising a guiding element and mouthpiece, isometric projection
Fig. 4: the observed mouthpiece with guide pin inserted in the end slat, front view
Fig. 5: guiding element with guide channels, plan view
Fig. 6: mouthpiece with the guide pin, spring and slider, plan view
Fig. 7: into the end slat inserted mouthpiece in a tight fit, of which the guide pin is located in the area of the first blocking spot on the guiding element
Fig. 8: the same as in Fig. 7, only with the guide pin in the area of the second blocking spot
Fig. 9: the same as in Fig. 7, only with the guide pin in the area of the third blocking spot
Fig. 10: the same as in Fig. 7, only with the guide pin in the area of exit from the guiding element

Thereby the reference numerals in the figures indicate as follows:

1 roller shutter
2 slats
2.1 end slat
3 winding mechanism
4 window sill or door threshold
5a side guide
5b side guide
6 anti-burglary mechanism
6.1 anti-burglary mechanism
7 guiding element
8 mouthpiece
9 guide plate
9a closed guide channel
9b open guide channel
10 protrusion
11 protrusion
12 supporting plate
13 mounting hole
14a first blocking spot
14b second blocking spot
14c third blocking spot
15a sliding surface
15b sliding surface
15c sliding surface
15d sliding surface
15e sliding surface
16 outgrowth
17 spring
18 guide pin
19 sliding ridge
20 slider
21 elongated cut-out
22 guide channel
23 longitudinal cut-out
24 extension
25 depression
H distance between the end slat and the window sill or door threshold

Fig. 1 shows that a roller shutter 1 comprises slats 2, which slide with their ends inside guide channels 5a and 5b and are, on one side, attached to the axis of a winding mechanism 3, whereas the other side is free. When pulling up slats 2, they wind on the axis of the winding mechanism 3 and when pulling them down, they unwind from the axis. Thereby also the end slat 2.1 is pulled up or down, the end slat 2.1, which can rest on the window sill 4 and thus veils it, or it can also be fully or partially open and thus away from the window sill 4 by a certain distance H.
A component part of the roller shutter 1 is also a pair of anti-burglary mechanisms 6 and 6.1 according to the invention, which are fixed via guiding element 7 to the side guide 5a and 5b, respectively so that both guiding elements 7 are away from the window sill 4 or the lower part of the side guides 5a and 5b by the same distance. The mouthpieces 8 of the mechanisms 6, 6.1 are in a tight fit inserted into the corresponding ends of the end slat 2.1, which together with the other slats 2 is vertically movable inside the side guides 5a and 5b of the roller shutter 1. One previously mentioned mouthpiece 8 is inserted into both side openings of the end slat 2.1, so that its head with an elongated cut-out 21 and a guide pin 18, which can be moved lengthwise inside it, and a sliding ridge 19 protrudes out of it. The described is shown in Fig. 4. The remaining longer part of the mouthpiece 8 with a spring 17 and slider 20 is located inside the opening in the end slat 2.1, which is not separately shown.
In Fig. 2 and Fig. 3 it is shown that the anti-burglary mechanism 6 basically comprises two parts, namely the guiding element 7 and the mouthpiece 8, which applies also for the anti-burglary mechanism 6.1, which is not separately shown.
It is evident from Fig. 2 and partially also from Fig. 3 that the guiding element 7 of the anti-burglary mechanism 6 is inserted into the guide channel 22 of the side guide 5a so that it lies in the direction of its longitudinal axis and so that it, with the supporting plate 12, rests on the back wall of the guide channel 22, onto which it is attached with a screw joint or some other suitable fastening via mounting hole 13. Therefore, the guiding element 7 is positioned in the guide channel 22 of the side guide 5a so that its supporting plate 12 is located opposite to the longitudinal cut-out 23, whereas its guide plate 9 is located at the longitudinal cut-out 23 and in the same plane with slats 2 and with the end slat 2.1, respectively. This applies also for the guiding element 7 of the anti-burglary mechanism 6.1, which is located in the guide channel 22 with the longitudinal cut-out 23 of the side guide 5b, but in the mirrored position, which is not separately shown.
As shown in Fig. 5, the guiding element 7 is formed of a guide plate 9, and perpendicular thereto, a supporting plate 12 with the mounting hole 13. A closed guide channel 9a and an open guide channel 9b, which are interconnected, are formed into the surface of the guide plate 9 and along it, and an elongated protrusion 10 with a conical outgrowth 16, a slender extension 24 and a depression 25 are located between them. The closed guide channel 9a in the area of the extension 24 passes over through a curve at the protrusion 11 to the linear open guide channel 9b, which passes at the free linear edge of the guide plate 9. The guide plate 9 and the supporting plate 12 form a single body of the guiding element 7.
The closed guide channel 9a borders the supporting plate 12 on one side and the protrusion 10 and its slender extension 24 on the opposite side. In the upper part, the closed guide channel 9a is of a funnel shaped construction, which is then transformed into a winding section with three curves, the last curve of which goes round the extension 24 at the protrusion 11 and continues then into the open guide channel 9b. The middle winding section of the closed guide channel 9a is formed with curves in a mirrored form of the block letter S.
In the upper part, the protrusion 10 passes over to a slender conical and flexible outgrowth 16 extending outside and slightly above the upper edge of the guide plate 9, whereas in the lower, i.e. opposite part, it passes over to a slender, yet rigid extension 24, which is located in the front surface of the guide plate 9. The conical outgrowth 16 tilts slightly from the longitudinal central axis of the guide plate 9 in the direction towards the open guide channel 9b so that it corresponds with the tilt at the funnel-shaped entry into the closed guide channel 9a. As previously described, the slender extension 24 represents the end lower part of the protrusion 10, which is in its central part bent in a direction towards the supporting plate 12 so that its legs limits an inner obtuse angle.
The protrusion 10 on the guide plate 9 is surrounded from one and from the other side by rigid sliding surfaces, namely the sliding surfaces 15a and 15b located at the closed guide channel 9a, whereas the sliding surfaces 15c, 15d and 15e are located at the open guide channel 9b. The sliding surface 15a extends from the top of the conical outgrowth 16 to the second blocking spot 14b, whereas the sliding surface 15b stretches from the blocking spot 14b to the end of the slender extension 24. On the other side of the extension 24, the sliding surface 15b passes into the sliding surface 15c, which extends into the sliding surface 15d and the sliding surface 15d further into the sliding surface 15e, which ends at the top of the conical outgrowth 16 respectively passes through it into the sliding surface 15a in the opposite side. It applies that the closed guide channel 9a, the open guide channel 9b and the protrusion 10, with the exception of its outgrowth 16, and the protrusion 11 are of rigid construction.
It is also evident from Fig. 5 that the first curve of the winding section of the closed guide channel 9a represents the first blocking spot 14a, whereas the second curve above it represents the second blocking spot 14b and the third curve below it represents the third blocking spot 14c.
Fig. 6 shows a mouthpiece 8, which has, at one end, a head with a sliding ridge 22 and an elongated cut-out 21 open at one side, in the elongated cut-out 21, a guide pin 18 is movably located, which is connected via spring 17 with a slider 20 that slightly protrudes from the housing of the mouthpiece 8. The spring 17 regulates the movement of the guide pin 18 through the closed guide channel 9a and the open guide channel 9b on the guide plate 9 as well as the movement of the slider 20 through the mouthpiece 8.
It applies that it is possible to build the anti-burglary mechanism 6 or 6.1 into the side guides 5a, 5b of the roller shutter 1 of windows or doors and also into the insect screens on them.
Below the method of operation of the anti-burglary mechanism of the roller shutter 1 according to the invention is described. As previously described, one anti-burglary mechanism 6 belongs to the side guide 5a, whereas the other anti-burglary mechanism 6.1 belongs to the side guide 5b. The guiding elements 7 of the anti-burglary mechanisms 6 and 6.1 are located and attached inside the guide channel 22 of the side guides 5a and 5b, whereas the mouthpieces 8 are inserted each with one part into one end of the end slat 2.1, whereas, with the other part, they are located inside the corresponding guide channel 22.
As the operation of both anti-burglary mechanisms 6, 6.1 in the side guides 5a and 5b is identical, only the anti-burglary mechanism 6 that belongs to the side guide 5a will be used for the description of the method of their operation. The identical description applies also for the anti-burglary mechanism 6.1 that belongs to the side guide 5b.
When pulling down the slats 2 of the roller shutter 1 or the end slat 2.1, the mouthpiece 8 with the guide pin 18 travels along the guide channel 22 with the longitudinal cut-out 23 in the corresponding side guide 5a. A guided movement of the guide pin 18 starts when it reaches the conical outgrowth 16 on the protrusion 10 of the guiding element 7 and when the guide pin 18 leans on the sliding surface 15a of the protrusion 10. The guide pin 18 slides along the sliding surface 15a to the closed guide channel 9a and along it to its first curve, which represents the first blocking spot 14a. The described is shown in Fig 2, Fig. 5 and Fig. 7.
When pulling down slats 2 along the side guides 5a, 5b, the end slat 2.1 with the mouthpieces 8 reaches the first blocking spot 14a on the guiding element 7, the guide pin 18 of the mouthpiece 8 stops at this spot, whereby the movement of the end slat 2.1 also stops. Consequently, the remaining slats 2 above the end slat 2.1 begin to load on each other, causing partial closure and thus diming the space with the roller shutter 1.
If the previously mentioned darkening with the roller shutter 1 is not desired, the end slat 2.1 with slats 2 can be pulled up until the guide pin 18 of the mouthpiece 8 reaches the second blocking spot 14b, where the end slat 2.1 is stopped again. The remaining slats 2.1 are still pulled up until they are fully stretched. When the slats 2 are fully stretched, their pulling up stops. By means of the end slat 2.1, the slats 2 are, in this position, stretched in the area between the second blocking spot 14b and the shaft of the winding mechanism 3, the electric motor of which prevents the slats 2 from being pulled down. This represents the main phase in the operation of the roller shutter 1 with the anti-burglary mechanisms 6 and 6.1, wherein the mutually movably connected slats 2 are in a stretched position with visible perforated passes that enable ventilation of the living spaces. Ventilation is carried out through the open perforations of slats 2, at the same time, in this position, it is possible to pull them up or down. The described position of the guide pin 18 of the mouthpiece 8 in the area of the second blocking spot 14b on the guide plate 9 of the guiding element 7 results in partial opening, i.e. distance H between the end slat 2.1 and the window sill or door threshold 4. Thereby it is of importance that the distance H is such that it does not enable the entry of an undesired person into the living space. In this way, in addition to ventilation, the safety anti-burglary function of the roller shutter 1 is ensured.
The previously described phase is followed by the release of the slats 2 of the roller shutter 1, whereby the guide pins 18 of the mouthpieces 8 along with the end slat 2.1 move from the second blocking spot 14b to the third blocking spot 14c. This movement causes that the slats 2 start to lower one after another and they lower until they are completely tight to each other. Thereby the roller shutter 1 is closed and the living space is made dark. At the same time the phase of further ventilation is made impossible. Thereby the electric motor pushes the slats 2 towards the lower part of the closed guide channel 9a of the guiding element 7 and as a result they can no longer be pulled up, which ensures anti-burglary function of the roller shutter 1 also in such a case.
The last phase in the operation of the anti-burglary mechanisms 6 and 6.1 is the release of the end slat 2.1 and the pulling up of the slats 2 in the direction of the winding mechanism 3. During the pulling up of the end slat 2.1 with the remaining slats 2, the guide pin 18 of the mouthpiece 8 travels along the open guide channel 9b of the guiding element 7, until the guide pin 18 leaves its conical growth 16 and then forward to the winding mechanism 3.
During the entire previously described path of sliding of the guide pin 18 along the guide channels 9a and 9b on the guiding element 7, the guide pin 18 moves forward and backward along the elongated cut-out 21 at the front end of the mouthpiece 8. The sliding ridge 19 on the head of the mouthpiece 8 enables the mouthpiece 8 to slide more smoothly along the wall of the guide channel 22 in the side guides 5a and 5b.

Claims

An anti-burglary mechanism (6, 6.1) for blocking roller shutters (1) of windows, doors and insect screens in order to prevent unwanted entry of persons into living spaces while the position of the slats (2) of the roller shutter (1) is closed or partially open, comprising a guiding element (7) adapted to be fixed to a side guide (5a, 5b) of the roller shutter (1) and a mouthpiece (8) with an open elongated cut-out (21), adapted to be inserted into an end of an hollow end slat (2.1) of the roller shutter (1), wherein the mouthpiece (8) is a flat housing into which a spring (17) with a slider (20) on one side and a guide pin (18) on the other side of it are integrated, whereby the latter can move linearly within the open elongated cut-out (21), wherein the guiding element (7) is formed by a guide plate (9) and a supporting plate (12) that is perpendicular to the guide plate (9) and that has a mounting hole (13) to be mounted on the wall of a guide channel (22) of the roller shutter (1) side guide (5a, 5b), characterized in that
- on the front surface of the guide plate (9) of the guiding element (7) facing the guide channel (22) of the roller shutter (1) side guide (5a, 5b), at least one elongated protrusion (10) is formed, with a conical outgrowth (16) at one end and a slender extension (24) at the opposite end and with at least one depression (25) between them, and that slightly below the elongated protrusion (10), at least one further protrusion (11) is formed,

- at the inner longitudinal edge of the elongated protrusion (10) facing the supporting plate (12), at least one closed guide channel (9a) is formed, which is adjacent to the supporting plate (12) and the further protrusion (11), while at the outer edge of the elongated protrusion (10) facing a longitudinal cut-out (23) of the guide channel (22) of the roller shutter (1) side guide (5a, 5b) at least one open guide channel (9b) is formed, which is adjacent to the longer outer edge of the guide plate (9), wherein the closed guide channel (9a) and the open guide channel (9b) are interconnected,

- the closed guide channel (9a) is funnel-shaped and further passes into a winding section with at least three curves, the further protrusion (11) together with the elongated protrusion (10) forms the middle winding section of the closed guide channel (9a), the last curve of the winding section at the further protrusion (11) turns round the slender extension (24) and goes further into the open guide channel (9b),

- the edges of the elongated protrusion (10) represent five rigid sliding surfaces (15a, 15b, 15c, 15d, 15e), whereby the first and second sliding surfaces (15a, 15b) lie at the closed guide channel (9a), whereas the third, fourth and fifth sliding surfaces (15c, 15d, 15e) lie at the open guide channel (9b),

- along the winding section with at least three curves within the closed guide channel (9a) at least three blocking spots (14a, 14b, 14c) are formed, whereby the first blocking spot (14a) is located within the first curve, the second blocking spot (14b) within the second curve and the third blocking spot (14c) within the third curve of the closed guide channel (9a),

- the mouthpiece (8) has on the front surface of its head facing the wall of the guide channel (22) of the roller shutter (1) side guide (5a, 5b) on which the supporting plate (12) is to be mounted and at the elongated cut-out (21) at least one sliding ridge (19).
The anti-burglary mechanism (6, 6.1) according to claim 1, characterised in that the elongated protrusion (10) at its upper end passes into the slender and flexible conical outgrowth (16) extending slightly outside the guide plate (9), whereas at its opposite lower end, the elongated protrusion (10) passes into the rigid slender extension (24) located on the front surface of the guide plate (9).
The anti-burglary mechanism (6, 6.1) according to one of claims 1 or 2, characterised in that the conical outgrowth (16) is slightly tilted from the longitudinal central axis of the guide plate (9) towards the open guide channel (9b) so that the tilt of the conical outgrowth (16) is accordant with the tilt on the funnel-shaped entry into the closed guide channel (9a) and that the slender extension (24) is bent in its central part in a direction towards the supporting plate (12) so that the legs of the slender extension (24) limit an inner obtuse angle.
The anti-burglary mechanism (6, 6.1) according to claim 1, characterised in that the closed guide channel (9a), the open guide channel (9b) and the elongated protrusion (10), with the exception of its flexible outgrowth (16), and the further protrusion (11) are of rigid construction.
The anti-burglary mechanism (6, 6.1) according to one of claims 1 or 3, characterised in that the guide channels (9a, 9b) are of any cross-section and depth.
The anti-burglary mechanism (6, 6.1) according to claim 1, characterised in that the first sliding surface (15a) extends from the tip of the slender outgrowth (16) to the second blocking spot (14b), whereas the second sliding surface (15b) extends from the blocking spot (14b) to the end of the slender extension (24) and at the opposite side of the slender extension (24), the second sliding surface (15b) passes onto the third sliding surface (15c), which continues to extend to the fourth sliding surface (15d) and the fourth sliding surface (15d) continues to the fifth sliding surface (15e), ending at the tip of the slender outgrowth (16), or passing over via said tip to the first sliding surface (15a) at the opposite side of the slender outgrowth (16).
A method of operation of an anti-burglary mechanism (6, 6.1) according to one of claims 1 to 6, in which the end slat (2.1) with mouthpieces (8) at each side slides along the longitudinal cut-out (23) in a guide channel (22) of side guides (5a, 5b) of the roller shutter (1), whereby the mouthpieces (8) with the guide pins (18) move towards the corresponding guiding element (7), which is attached in the guide channel (22) characterised in that,
- when the guide pins (18) of the mouthpieces (8) arrive at the outgrowth (16) on the elongated protrusion (10) of the guiding element (7), they lean on the first sliding surface (15a) and slide along it to the closed guide channel (9a) and further to its first curve, where the first blocking spot (14a) is located, in which the guide pins (18) of the mouthpieces (8) stop, whereby also the end slat (2.1) and the remaining slats (2) stop and begin to load on each other until partial closure of the roller shutter (1) is reached, thereby making the living space darker;

- in order to undarken the room by means of the roller shutter (1), the end slat (2.1) with the remaining slats (2) must be pulled up by as much that the guide pins (18) of the mouthpieces (8) have reached the second blocking spot (14b), where the end slat (2.1) stops again, while the remaining slats (2) keep being pulled up until they are fully stretched out, whereupon they stop;

- when the guide pins (18) of the mouthpieces (8) are located in the second blocking position (14b), the slats (2), by means of the end slat (2.1), are taut and stretched between themselves so that the intermediate perforation transitions are visible, which enable ventilation of the living spaces;

- the position of both guide pins (18) of the mouthpieces (8) within the second blocking position (14b) in the closed guide channel (9a) enables partial opening at the distance (H) between the end slat (2.1) and the window sill or the door threshold (4),

- the guide pins (18) of the mouthpieces (8) together with the end slat (2.1) must move from the second blocking position (14b) to the third blocking position (14c) in order to release the slats (2) in the roller shutter (1) so that one after another they start lowering until they are completely tight against one another and they darken the living space,

- also within the third blocking spot (14c), the anti-burglary function of the roller shutter (1) is ensured by the electric motor that pushes slats (2) together with the end slat (2.1) via winding mechanism (3) towards the lower part of the closed guide channel (9a) of the guiding element (7),

- when the end slat (2.1) together with other slats (2) of the roller shutter (1) is pulled up from the third blocking spot (14c) towards the winding mechanism (3), the guide pin (18) of the mouthpiece (8) travels further up along the open guide channel (9b) of the guiding element (7) until the guide pin (18) leaves the conical outgrowth (16),

- the sliding ridge (19) on the head of the mouthpiece (8) is intended to make the sliding of the mouthpiece (8) with the guide pin (18) along the guide channel (22) of the side guides (5a, 5b) smoother.