Sealing shade and method of operation

Abstract

The invention relates to a sealing shade, which is a device that can block light coming in through a window or opening in a wall and which includes an operating mechanism, said sealing shade comprising: a shade sheet (7) having at least one edge attached to one edge of an opening in the wall; at least one sealing strip (4), placed along the perimeter of the opening and facing the shade sheet; at least one flexible strip (5) affixed to the surface of the shade sheet (7), facing the above-mentioned opening and defining a shape that matches the sealing strip (4); and an operating mechanism which, when operated, can perform the following actions without causing sliding friction tangential to the contact surface between the sealing strip (4) and the flexible strip (5), namely: • retracting or deploying the shade sheet (7), • attaching the flexible strip (5) to, or detaching it from the sealing strip (4).

Description

[0001] 10-01-2026

[0002] SEALING BLIND AND METHOD OF OPERATION DESCRIPTION BACKGROUND

[0003] 1. Field of the invention.

[0004] The invention relates, in general, to a sealing blind and its method of operation.

[0005] 2. Background of the technique.

[0006] During the last few decades, the window covering products industry has expanded considerably, as has the variety of solutions and mechanisms used for room darkening purposes.

[0007] Any type of room darkening product that requires any additional action by the user to be operated is considered impractical compared to the current state of the art, drastically reducing the acceptance of such a product in the market.

[0008] Furthermore, the use of cords in the corresponding drive mechanisms has proven to be a cause of numerous fatal accidents involving the strangulation of young children in recent years, leading to the enactment of new laws and regulations that restrict the range of acceptable solutions and make it even more difficult to create new products.

[0009] Roller blinds are expensive and complex to install, and at the more economical end of the range of available room-darkening products, blinds with side channels are still more expensive and complex to install than conventional blinds. Furthermore, blinds with side channels are not effective at blocking convective heat transfer through the opening, not to mention that most models still allow some visible light into the room.

[0010] The following documents are part of the state of the art and disclose different solutions related to window coverings:

[0011] US Patent No. 4,079,772;

[0012] US Patent No. 5,850,864; 10-01-2026

[0013] However, there are no state-of-the-art window covering solutions that solve all the problems mentioned above and, at the same time, include a drive mechanism configured to allow the execution of all the intended operational functions of the device.

[0014] In conclusion, there is a market need for a new type of light-blocking window covering that effectively blocks visible light passing through a window or opening, and includes a mechanism that is configured to allow the device to operate in all of its intended operating modes.

[0015] SUMMARY OF THE INVENTION

[0016] It is desirable to have a device that is capable of blocking visible light passing through a window or an opening made in a wall, and that includes an actuation mechanism configured to allow the operation of the device.

[0017] It would also be desirable to have a device that meets the current requirements and expectations of the window covering industry in terms of practicality, safety, and aesthetics.

[0018] Furthermore, it would be desirable to have a device that can be manufactured and marketed at a lower cost than other existing solutions on the market with the same functionality and purpose.

[0019] The disclosed device and associated method advantageously satisfy these needs and address the aforementioned deficiencies by providing a magnetically sealable blind that blocks visible light passing through a window or opening and is operated, including the magnetic coupling and uncoupling functions with respect to said window or opening, by manipulating a simple mechanism that exhibits a level of simplicity equivalent to that of the mechanisms used to operate a traditional blind, in which the main functions are extension and retraction.

[0020] A sealing blind is disclosed that consists of the following components:

[0021] A wall;

[0022] - An opening made in said wall through which unwanted light may enter; - A blind sheet comprising at least one opaque flexible sheet, at least one edge of which is attached to an edge of an opening made in the wall, so that the remainder of said sheet can extend from said edge over the opening made in the wall;

[0023] At least one sealing strip arranged along the perimeter of the opening and oriented towards the blind slat; 10-01-2026

[0024] - At least one flexible strip attached to the surface of the blind sheet, facing the aforementioned opening, and describing a shape that corresponds to the sealing strip;

[0025] - An actuating mechanism that, when actuated, is capable of performing the following actions without causing tangential sliding friction to the contact surface between the sealing strip and the flexible strip:

[0026] • retract the blind slat;

[0027] • unfold the roller blind;

[0028] • Attach the flexible strip to the sealing strip;

[0029] • Detach the flexible strip from the sealing strip.

[0030] The operating mechanism causes the edge of the blind slat furthest from the support to detach from the opening and be rolled or unrolled around a cylindrical tube, allowing the user to either detach and retract the blind slat from the opening, or extend and attach it to the opening. Several embodiments of this operating mechanism will be described.

[0031] Additionally, the sealing blind may comprise a support arranged in the opening made in the wall and to which at least one edge of the blind sheet is attached.

[0032] Optionally, it may also include a cylindrical tube attached to the blind sheet at the edge furthest from the edge of the opening made in the wall or support.

[0033] The device may be equipped with any of the following actuation mechanisms, without limitation:

[0034] FORM OF EMBODIMENT A: SPRING MECHANISM

[0035] In addition to the wall, opening, bracket, blind sheet, tube, sealing strip and magnetic strip mentioned above, this version of the device also includes the following elements:

[0036] - A top hook, fixed to the support and equidistant from both sides of the opening;

[0037] A lower hook, fixed to the wall below the bottom edge of the opening and equidistant from both sides of the opening;

[0038] - A cylindrical shaft located concentrically inside the tube and slightly longer than it;

[0039] - Two circular caps covering the ends of the tube, provided with a circular perforation in their center into which the ends of the shaft are inserted, said two caps being 10-01-2026

[0040] attached to the tube and acting as bearings for the shaft, allowing it to rotate around its axis inside the tube;

[0041] A coiling spring located concentrically inside the tube and around the outside of the shaft, one end of said spring being attached to the shaft and the other end attached to one of the tube's end caps, such that rotation of the tube about the shaft causes the spring to tighten or loosen around the shaft;

[0042] A handle firmly attached to the shaft, said handle having the shape of a wide U extending from one end of the shaft to the other, on the outside of the tube, and being thin enough to be easily hooked onto the upper or lower hook.

[0043] Regarding the operating method of this version of the device, the user can lower and attach the blind simply by taking the handle, pulling it down and hooking it onto the bottom hook.

[0044] To detach and raise the blind, the user unhooks the handle from the lower hook, lifts it, and hangs it from the upper hook. As this is done, the blind slat automatically rolls up around the tube using the spring mechanism.

[0045] EMBODIMENT B: DUAL-FUNCTION SPRING MECHANISM

[0046] When both ends of a torsion spring are twisted in opposite directions, the spring progressively accumulates internal stresses in order to resist the applied torques. As a result, the spring generates two reaction torques (one at each end), which are not only equal in magnitude and opposite in direction with respect to the applied torques, but are also equal in magnitude and opposite in direction to each other.

[0047] Embodiment B is based on the Law of Action and Reaction and makes separate use of the two reaction pairs mentioned above for two distinct purposes, as its name indicates. However, before explaining the operation of this mechanism, a brief description of its structure is necessary.

[0048] From a structural point of view, this disclosed version of the invention can be obtained from embodiment A simply by removing its handle and arranging the elements of the lower section of the invention (namely, the rolled-up blind slat assembly, the tube, the tube end caps, the axle, and the spring, which shall be collectively referred to hereafter as the "roll-up assembly") inside a (not necessarily) cylindrical housing. This housing is provided with a longitudinal slot to allow the blind slat to move both outward and inward. 10-01-2026

[0049] Therefore, in addition to the wall, the opening, the support, the blind sheet, the tube, the sealing strip and the magnetic strip mentioned above at the beginning of this section, this version of the device additionally includes the following elements, from the inside out: - A cylindrical shaft located concentrically inside the tube and slightly longer than it;

[0050] - Two circular caps covering the ends of the tube, provided with a circular perforation in their center to accommodate the axle, said two caps being fixed to the tube and acting as bearings for the axle, allowing it to rotate around its axis inside the tube;

[0051] - A coiling spring located concentrically inside the tube and around the outside of the shaft, one end of said spring being fixed to the shaft and the other end fixed to one of the tube's end caps, such that the rotation of the tube about the shaft causes the spring to tighten or loosen around the shaft;

[0052] - A hollow housing surrounding the roll-up assembly, which can take many forms, but for the purposes of this explanation will be considered cylindrical, said housing being provided with two circular caps that close its ends and are fixed to the ends of the shaft.

[0053] To better understand the operation of this version of the disclosed invention, attention should be focused on the spring. As explained above, one end of the winding spring is fixed to one of the tube end caps (and thus connected to the tube itself), while the other end is fixed to the shaft, which, in turn, is fixed to the housing. When the tube rotates inside the housing to allow the blind slat to unwind, there is an increase in the opposing torque exerted by the spring. This means that one end of the spring increasingly attempts to rotate the tube to wind the blind slat, while the other end attempts to rotate the housing around the winding assembly in the opposite direction.

[0054] This means that whenever the spring is twisted, the housing tends to rotate around the roller assembly, and one edge of the groove comes into contact with the blind slat extending from the housing. In this embodiment, this edge is referred to as the "stopping edge."

[0055] The pressure exerted by said edge on the blind slat is used advantageously in this version of the invention, since it can stop the movement of the blind slat and thus help to position the blind at the desired height.

[0056] Regarding the method of operation of this version of the device, the user can lower and attach the blind simply by holding the invention by the housing, rotating it slightly around its axis to separate the stopping edge from the blind slat, and pulling it down.

[0057] Down to the desired height. When released, the housing will rotate naturally on the spring and the stop edge will automatically lock the blind in position.

[0058] To detach and raise the blind, the user grasps it again by the housing and turns it in the same direction as before, so that the blind sheet is released from the stopping edge, after which they raise it to the desired height and release it so that it is automatically locked at that desired height.

[0059] In summary, both the upward and downward movement of this version of the disclosed device can be easily performed by a quick "twist and slide" action, which is convenient for achieving the ease of use required in today's market.

[0060] BRIEF DESCRIPTION OF THE DRAWINGS

[0061] FIG. 1 shows a front view of embodiment A in its fully extended position, with a partial cut.

[0062] FIG. 1A refers to FIG. 1 and shows a detailed view of the internal mechanism of embodiment A.

[0063] FIG. IB refers to FIG. 1 and shows an example of a locking system and its internal details.

[0064] FIG. 2 shows a left side view of the upper area of ​​embodiment A and the corresponding details.

[0065] FIG. 3 shows a left side view of the lower area of ​​embodiment A and the corresponding details.

[0066] FIG. 4 shows a front view of embodiment A in its fully retracted position and the corresponding details.

[0067] FIG. 5 shows a left side view of the cylindrical housing mentioned in embodiment B, with its retaining edge covered by a U-shaped rubber profile. FIG. 6 is a perspective view of the cylindrical housing mentioned in embodiment B, with its end caps.

[0068] FIG. 7 presents an isometric view of an example of a torsion spring being twisted by the torques A1 and A2 applied at its ends.

[0069] Figure 8 shows a left side view of the torsion spring of Figure 7 and the same torques. 10-01-2026

[0070] FIG. 9 represents the reaction couples exerted by the spring shown in FIG. 8.

[0071] FIG. 10 shows how the torsion spring transmits the reaction torques to the tube and the shaft, in embodiment B.

[0072] Figure 11 shows how the reaction torque R2 is transmitted to the housing through the shaft. Figure 12 is a schematic representation of the torques R1 and R2 acting on the tube and the housing when embodiment B of the invention is left hanging freely.

[0073] FIG. 13 is a schematic representation of how the user should position the housing in order to move the blind to the desired height.

[0074] FIG. 14 is a front view of the invention installed in a window, using the cylindrical housing mentioned in embodiment B.

[0075] FIG. 15 presents an isometric view of the lower section of embodiment B shown in FIG. 14.

[0076] FIG. 16 is a detailed view of the lower left corner of FIG. 15.

[0077] FIG. 17 is a left side view of FIG. 16 and shows the gap between the blind sheet and the wall, due to the width (diameter) of the housing.

[0078] FIG. 18 is a left side view of the lower section of embodiment B, and shows the correct position of the housing to achieve complete blackout.

[0079] FIG. 19 exemplifies the wide variety of possible solutions to achieve, for example, a teardrop-shaped housing.

[0080] DETAILED DESCRIPTION

[0081] The present invention relates to a sealing blind and its method of operation.

[0082] FIG. 1 shows a front view of the preferred embodiment of the invention (embodiment A), wherein the blind sheet 7 and the magnetic strip attached thereto have been partially sectioned in the area around the upper right corner in order to allow visibility of the elements located behind.

[0083] Element 1 is the wall with a rectangular opening 2 through which unwanted light can enter. Surrounding the opening 2 is the sealing strip 4, to which the magnetic strip (not visible in this figure) attaches by attraction. At the top of the image is the bracket 6, from which the blind slat 7 hangs and to which the upper hook 15 is attached. The blind slat 7 is shown fully extended, with the cylindrical tube 8 at the bottom and the handle 11 hooked onto the lower hook 12.

[0084] The spring mechanism included in this embodiment is arranged inside the cylindrical tube 8, in the lower right corner of the figure, referenced as 1A, and will be shown in FIG. 1A. Similarly, the locking system incorporated in this version of the disclosed device is located in the lower left corner of this image, referenced as IB, and will be described in FIG. IB.

[0085] FIG. 1A contains a cross-section of the area marked as 1A in FIG. 1. In it, it is possible to observe the shaft 10 located inside the tube 8 and the winding spring 13 around said shaft 10. Detail A shows how the left end of the winding spring 13 is inserted into the shaft 10, while detail B shows how the opposite end of said winding spring 13 is inserted into the right cap 9.

[0086] Given that the right cover 9 is attached to the tube 8 while the axle 10 is attached to the handle 11, it can be understood that when the user pulls the handle 11 down to extend the blind, the right end of the winding spring 13 is forced to rotate along with the right cover 9 around the axle 10, while the left end of said winding spring remains inserted at the same point on the axle 10. This effect causes the winding spring 13 to accumulate internal tensions which will cause the blind slat to wind around the tube when the handle 11 is raised.

[0087] Figure 1B shows an example of a locking system that the user can use to fix the blind slat 7 at an intermediate degree of extension simply by pressing button 18 with the left hand, while holding handle 11 with the right hand. Detail C shows a partial section of the elements involved in the operation of this locking system. It is important to note that the shaft 10 has been provided with a disc-shaped protrusion that has the same outer diameter as the left-hand cap 14. An Allen screw with a shoulder 16 is inserted into the right-hand surface of this protrusion, with its shank extending to the left in the figure. This shank supports a release spring 17 that is held in position by button 18, into which the threaded end of the Allen screw 16 is inserted.

[0088] Additionally, the left cap 14 contains a series of perforations of the same diameter as the head of the Alien screw 16, arranged in such a way that, when the tube 8 rotates around the axis 10, these perforations can align with the Alien screw 16. When this occurs while the user is pressing the button 18, the spring 17 is compressed and the Alien screw 16 slides into the left cap 14, thereby blocking the relative rotation of the tube 8 with respect to the axis 10.

[0089] Friction keeps the Alien screw 16 inside the left cover 14 for as long as the user wishes to keep the blind slat 7 in that position. If the user wishes to disengage the locking system in order to extend or retract the blind slat 7, a slight pull towards 10-01-2026

[0090] The handle below 11 reduces the frictional forces acting on the screw 16, allowing the decoupling spring 17 to move the screw 16 back out of the cover 14.

[0091] This locking system is only one example of the many systems that can be used to keep the blind at an intermediate height and is not intended to be limiting.

[0092] FIG. 2 contains a left side view of the uppermost part of embodiment A of the disclosed invention. Element 1 is the wall to which the bracket 6 is fixed. The upper edge of the blind slat 7 is attached to the bracket 6, as is the upper hook 15, which remains unused in this instance.

[0093] Detail D shows the elements involved in sealing the opening. The mounting tape 3 is positioned directly on the wall surface 1 and surrounds the opening. The sealing strip 4 is placed on top of the mounting tape 3. The magnetic strip 5 is positioned on the blind slat 7 and is magnetically attached to the sealing strip 4. The three strips—mounting tape 3, sealing strip 4, and magnetic strip 5—extend along the periphery of the opening, all forming a rectangular shape of the same dimensions, slightly larger than the opening. However, mounting tape 3 and sealing strip 4 remain securely attached to the wall during operation of the device, while the magnetic strip 5 remains attached to the blind slat and rolls up and down with it.

[0094] Figure 3 shows a left side view of the lower portion of embodiment A of the disclosed invention, for better visualization. Element 1 is the wall, element 7 is the blind slat, and element 11 is the handle, which is held in position by the lower hook 12 fixed to the wall 1 below the opening.

[0095] Detail E shows the elements involved in sealing the opening. The mounting tape 3 is positioned directly on the wall surface 1 and surrounds the opening. The sealing strip 4 is placed on top of the mounting tape 3. The magnetic strip 5 is positioned on the blind slat 7 and is magnetically attached to the sealing strip 4. The three strips—the mounting tape 3, the sealing strip 4, and the magnetic strip 5—extend along the periphery of the opening, all forming a rectangular shape of the same dimensions, larger than the opening. The mounting tape 3 and the sealing strip 4 remain securely attached to the wall during operation of the device, while the magnetic strip 5 remains attached to the blind slat and rolls up and down with it.Detail F shows how the lower section of the blind slat 7 is arranged around the tube 8 and how the handle 11 is attached to the shaft 10 so that both rotate together. Element 18 is the locking button. 10-01-2026.

[0096] Figure 4 is a front view of embodiment A of the present invention in its fully retracted position. In this position, the opening 2 is uncovered, allowing the entry of outside light. The blind slat and magnetic strip are fully wound around the tube located above the opening 2, while the sealing strip 4 remains attached to the wall 1 and is fully visible to the user.

[0097] Detail G provides a closer view of the upper left corner, where the locking button appears to be located below handle 11 due to the rotation of handle 11, and detail H shows how handle 11 is held hanging from the upper hook 15.

[0098] FIG. 5 is a left side view of the slotted cylindrical housing described in embodiment B. Element 35 is the circular profile of said housing, and element 36 is a U-shaped rubber cover attached to the retaining edge.

[0099] FIG. 6 shows a perspective view of the cylindrical housing described in embodiment B, wherein element 35 is the extruded profile of the housing, element 36 is the rubber covering that covers the retaining edge of the groove, and element 37 is one of the housing caps, fixed rigidly to the housing and provided with a hole in its center for fixing the shaft (not shown in this figure).

[0100] FIG. 7 presents an isometric view of an example of a coil spring (also known as a torsion spring) used to construct embodiment B, as well as the action torques A1 and A2 required to pre-tension it before assembling it with the rest of the components of the invention.

[0101] This spring will be used in the following figures to help explain how the Law of Action and Reaction is employed as the basic principle on which embodiment B is based. The spring shown has straight radial ends; however, this is shown only as an example and for explanatory purposes. Torque A1 is the clockwise torque acting on the left end of the spring, and torque A2 is the counterclockwise balancing torque acting on the right end of the spring. Therefore, torques A1 and A2 are equal in magnitude and opposite in direction.

[0102] FIG. 8 presents a left side view of FIG. 7. In it, it can be observed in greater detail that the pairs A1 and A2 are applied to the straight ends of the spring.

[0103] FIG. 9 shows the reaction couples R1 and R2 exerted by the spring in response to the action couples Al and A2 represented previously in FIGS. 8 and 7. This means that R1 and R2 are not only equal in magnitude and opposite in direction with respect to Al and A2, but are also equal in magnitude and opposite in direction to each other.

[0104] FIG. 10 contains a left side view of the torsion spring shown in FIG. 9, already assembled with tube 8 and shaft 10. The torque R1 is the reaction torque exerted by the spring on

[0105] 1110-01-2026

[0106] The tube 8, around which the blind slat will be wound, and the torque R2 is the reaction torque transmitted by said spring to the shaft 10, which will be rigidly fixed to the housing end caps (not shown in this figure). It is important to note that the way in which the spring is attached to the tube 8 and the shaft 10 has been simplified to facilitate visualization and understanding of the mechanism, and is not intended to accurately describe how the spring will be assembled in an actual embodiment.

[0107] Figure 11 is a perspective view of the slotted cylindrical housing of embodiment B, showing the direction in which torque R2 is transmitted from the shaft to the housing. Figure 12 is a simplified left-side view of the blind slat 7 when the invention is left hanging freely without any action by the user. In this position, one end of the spring transmits torque R1 to the tube 8, while the other end of the spring transmits torque R2 to the housing 35. As a result, the rubber coating 36 is pressed against the blind slat 7, blocking its movement and holding the blind at the desired height. This effect constitutes the first of the two main purposes of the so-called "double-coil spring," which is to lock the blind at the desired height.

[0108] Figure 13 shows housing 35 in its moving position. To move the blind up or down, the user must grasp housing 35 and rotate it to the position shown in this figure, so that the blind slat 7 is released from the action of the rubber cover 36. Once in this position, the user can, for example, move housing 35 upwards to place the blind in a higher position, while allowing the spring to wind the blind slat 7 around the tube 8. This figure therefore implicitly shows the second purpose of the "double-coil spring," which is the winding of the blind slat 7 around the tube 8.

[0109] Figure 14 is a front view of embodiment B installed in a wall with an opening. The housing used in this representation is still the slotted cylindrical housing previously described for embodiment B.

[0110] FIG. 15 is an isometric view of the lower section of FIG. 14.

[0111] FIG. 16 is a detailed isometric view of the lower left corner of FIG. 15.

[0112] FIG. 17 shows a left side view of FIG. 16 and is intended to facilitate the visualization of the distance "d" between the blind sheet and the wall, due to the diameter of the housing.

[0113] Figure 18 shows the rotation of the housing required to eliminate the gap between the blind slat and the wall, so that complete blackout can be achieved. A wide range of solutions are available for maintaining the housing in this position, and some examples have been mentioned, such as the use of hooks and loop fasteners. 10-01-2026

[0114] mechanical couplings, among others. However, the fact that these solutions have not been represented in the figures is solely due to the fact that the explanations necessary to describe them all would have been so extensive as to be considered impractical.

[0115] However, there is no intention to implicitly express that such solutions do not form part of the disclosed invention.

[0116] Figure 19 exemplifies the wide variety of possible shapes the housing can take. The six silhouettes shown in this figure are not the only ones considered for the design of the disclosed invention, and all of them share a common external geometry with a teardrop shape. However, Figure 19 is not intended to limit the number of possible geometries, features, or qualities that the housing can have. The housing of embodiment B and its associated covers can be manufactured in multiple shapes or configurations.

Claims

10-01-2026 CLAIMS 1.- Sealing blind, characterized in that it comprises: A living sheet (7), comprising at least one opaque flexible sheet, at least one edge of which is attached to an edge of an opening made in a wall, so that the remainder of said sheet can extend from said edge over the opening made in the wall; - At least one sealing strip (4) arranged along the perimeter of the opening and facing the living sheet; - At least one flexible strip (5) attached to the surface of the living sheet (7), facing the aforementioned opening, and describing a shape that corresponds to the sealing strip (4); A drive mechanism that, when actuated, is capable of performing the following actions without causing tangential sliding friction to the contact surface between the sealing strip (4) and the flexible strip (5): • retract the living area sheet (7); • unfold the living room sheet (7); • attach the flexible strip (5) to the sealing strip (4); • detach the flexible strip (5) from the sealing strip (4). 2.- Sealing seat according to claim 1, characterized in that it further comprises a support (6) arranged in the opening made in the wall and to which at least one edge of the seat sheet (7) is attached. 3.- Being sealed according to claim 1 or 2, characterized in that it further comprises a cylindrical tube (8) attached to the blind sheet (7) at the edge located furthest from either the edge of the opening made in the wall, or from the support (6).

4. Sealing blind according to claim 3, characterized in that it also includes the following elements: - An upper hook (15) fixed to the bracket and equidistant from both sides of the opening; - A lower hook (12) fixed to the wall below the lower edge of the opening and equidistant from both sides of the opening; 10-01-2026 A cylindrical shaft (10) located concentrically inside the tube (8) and slightly longer than it; Two circular caps covering the ends of the tube (8), provided with a circular perforation in their center into which the ends of the shaft are inserted, said two caps being attached to the tube and acting as bearings for the shaft, allowing it to rotate around its axis inside the tube; A winding spring (13) located concentrically inside the tube and around the outside of the shaft (10); A handle (11) firmly attached to the shaft (10). 5.- Sealing blind according to claim 4, characterized in that the winding spring (13) has one end attached to the shaft (10) and another end attached to one of the tube caps (8), such that the rotation of the tube (8) with respect to the shaft (10) causes the spring to tighten or loosen around the shaft. 6.- Sealing blind according to claim 4 or 5, characterized in that the handle (11) has the shape of a wide U extending from one end of the shaft to the other, on the outside of the tube (8), and has a sufficiently reduced thickness to be easily hooked onto the upper (15) or lower (12) hooks. 7.- Sealing blind according to claim 3, characterized in that it also includes the following elements: A cylindrical shaft (10) located concentrically inside the tube (8) and slightly longer than it; Two circular caps covering the ends of the tube (8), provided with a circular perforation in their center to accommodate the shaft, said two caps being fixed to the tube and acting as bearings for the shaft, allowing it to rotate around its axis inside the tube; A winding spring (13) located concentrically inside the tube and around the outside of the shaft (10), one end of said spring being fixed to the shaft and the other end fixed to one of the tube caps, such that rotation of the tube about the shaft causes the spring to tighten or loosen around the shaft; An element (35) surrounding the roll-up assembly. 10-01-2026 8.- Sealing element according to claim 7, characterized in that the element (35) has a circular profile and the element (36) is a U-shaped rubber covering attached to a stopping edge. 16

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