A manual sunshade roller and a sunshade structure thereof

Abstract

The application belongs to the technical field of manual shading roller blind, and discloses a shading structure of a manual shading roller blind, which comprises a shading groove, a shading plate and a fixing part, the shading groove is symmetrically arranged on an externally provided wall body, and the side of the shading groove away from the slot opening is connected with the wall body, the side of the two shading grooves close to the externally provided window is provided with a limiting block, the shading plate is provided with a notch matched with the position of the limiting block, the limiting block and the notch are matched to limit the translation of the shading plate along the arrangement direction of the shading groove, and the shading plate can move along the vertical direction; the fixing part is detachably connected with the limiting block, and the fixing part is used for pressing the shading plate on the side of the shading groove close to the window. The shading structure can be installed in the case of the existing manual shading roller blind, and the shading effect is improved through the cooperation of the shading groove and the shading plate. Meanwhile, the application also provides a manual shading roller blind with the shading structure.

Description

Technical Field

[0001] This application belongs to the field of manual blackout roller blind technology, specifically a manual blackout roller blind and its blackout structure. Background Technology

[0002] Manual blackout roller blinds are sunshade devices controlled by a beaded or spring mechanism. Belonging to a sub-sector of the building materials industry, they mainly consist of a roller tube, fabric, beaded system, and control unit. Suitable for offices, homes, and small glass curtain walls, they are available in two fabric types: transparent sun-shading fabric and blackout fabric, offering functions such as light regulation, heat insulation and energy saving, and privacy protection.

[0003] Manual blackout roller blinds are widely used in various places due to their many advantages, such as aesthetic appeal, simplicity, economy, practicality, and durable structure, especially suitable for small windows and small glass curtain walls. When the blind is raised, its size is so small that it is hardly noticeable; when the fabric is lowered, it softens indoor light, avoiding direct sunlight and achieving excellent sun-shading effects. With the advent of motorized blackout roller blinds, their extreme convenience and user experience have allowed them to capture a significant market share. Whether controlled by remote control, wall switch, or mobile app, all blinds can be easily controlled, making them particularly suitable for large floor-to-ceiling windows, skylights, and other scenarios where manual operation is inconvenient. They can even be integrated into smart home systems for intelligent adjustment.

[0004] For most consumers, "light blocking" is a basic functional requirement. Manual roller blinds perfectly meet this requirement at a very low cost. The convenience brought by electric roller blinds is more of an added bonus than a necessity for many users, and their high premium is not enough to make all users give up the cost-effective manual solution.

[0005] However, in bay window scenarios, users typically install manual blackout roller blinds on the ceiling of the bay window. Because of their simple structure, these blinds cannot perfectly cover the entire bay window area; light leaks can occur between the sides of the blind and the walls, as well as at the ceiling where they are installed. While users can choose to install them indoors to completely block out the bay window, this method renders the bay window area unusable when the blind is fully lowered. Therefore, there is an urgent need for a blackout structure that can solve the problem of light leakage from manual blackout roller blinds, especially for bay window locations. Utility Model Content

[0006] The purpose of this application is to provide a light-blocking structure for a manual blackout roller blind. This light-blocking structure can be well adapted to the structure of bay windows and can also be installed in the presence of existing manual blackout roller blinds. The light-blocking effect is improved through the cooperation of the light-blocking groove and the light-blocking plate. This application also provides a manual blackout roller blind incorporating this light-blocking structure.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A light-blocking structure for a manual light-blocking roller blind includes light-blocking grooves, light-blocking plates, and fasteners. The light-blocking grooves are symmetrically arranged on the external wall, and the side of the light-blocking groove facing away from its opening is connected to the wall. Each of the two light-blocking grooves has a limiting block on the side near the external window. The light-blocking plate has a notch that matches the position of the limiting block. The limiting block and the notch cooperate to restrict the light-blocking plate from translating along the arrangement direction of the light-blocking groove, and the light-blocking plate can move in the vertical direction.

[0009] When the notch and the limiting block are engaged, the two sides of the light-shielding plate are in contact with the wall; when the top of the light-shielding plate is in contact with the top wall where a manual light-shielding roller blind is installed, the light-shielding groove can completely block the notch; the fastener and the limiting block are detachably connected, and the fastener is used to press the light-shielding plate tightly against the side of the light-shielding groove near the window.

[0010] Preferably, the notch is a rectangular structure with one end open, and the limiting block is a cylindrical or cuboid structure. The size of the limiting block matches the size of the notch, and the limiting block is arranged near the top of the light-shielding groove.

[0011] Preferably, the end of the limiting block away from the light-shielding groove has a chamfered edge.

[0012] Preferably, the light-blocking structure of the manual light-blocking roller blind also includes a gasket, the thickness of the limiting block is less than the thickness of the light-blocking plate, the end of the limiting block away from the light-blocking groove has a connecting post, the middle of the gasket has a through hole that matches the connecting post, and the gasket is connected to the connecting post through the through hole. At this time, the end of the connecting post is located inside the through hole.

[0013] The fastener and the connecting post are detachably connected. The fastener is used to press the gasket against the light-shielding plate to press the light-shielding plate against the side of the light-shielding groove closest to the window.

[0014] Preferably, the side of the gasket that contacts the light-shielding plate has an anti-slip layer.

[0015] Preferably, the connecting column has a blind hole, the depth of which extends into the limiting block, and the inner wall of the blind hole has threads. The fastener is a hand-tightening bolt or a wing bolt.

[0016] Preferably, D-shaped sealing strips are connected to both sides and the top of the light-shielding plate.

[0017] Preferably, at least one of the light-blocking slots has a clearance portion for the pull cord of the manual light-blocking roller blind to pass through.

[0018] Meanwhile, this application also provides a manual blackout roller blind, including a bracket, a roller, a curtain, a pull cord, a transmission component, and the blackout structure of the manual blackout roller blind as described above. The brackets are symmetrically arranged and connected to the top wall of the external device by screws. The transmission component is connected to one of the brackets. The roller is located between the symmetrically arranged brackets. One end of the roller is rotatably connected to the bracket and the other end is connected to the transmission component. The pull cord is connected to the transmission component. One end of the curtain is fixedly connected to the roller. The pull cord is used to drive the transmission component to rotate so as to drive the roller to rotate and roll up or unroll the curtain. Both sides of the curtain are embedded in the blackout groove.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] 1. The light-blocking structure of this application can be well adapted to the structure of bay windows and can also be installed in the case of existing manual light-blocking roller blinds. The light-blocking groove can block the light between the two sides of the curtain and the two side walls. At the same time, the light-blocking plate can block the light at the top wall of the installation position, thereby improving the light-blocking effect.

[0021] 2. The light-shielding groove and light-shielding plate of this application adopt a split design, which facilitates transportation and installation;

[0022] 3. This application provides an edge chamfer at the end of the limiting block away from the light-shielding groove to facilitate the fit between the notch on the light-shielding plate and the limiting block;

[0023] 4. This application adds a gasket with an anti-slip layer between the hand-tightening bolt and the light-shielding plate, which can further ensure the stability of the light-shielding plate when locking it. At the same time, the installation method of the hand-tightening bolt is more convenient, can be operated by one person, and is simple to operate.

[0024] 5. This application adds D-shaped sealing strips to the sides and top of the light-shielding panel, which can ensure the fit between the sides of the light-shielding panel and the side walls, and also ensure the fit between the top of the light-shielding panel and the top wall. Attached Figure Description

[0025] Figure 1 This is one of the perspective views of the light-blocking structure of the manual light-blocking roller blind in Example 1;

[0026] Figure 2 This is a second perspective view of the light-blocking structure of the manual light-blocking roller blind in Example 1;

[0027] Figure 3 This is an exploded view of the light-blocking structure of the manual light-blocking roller blind in Example 1;

[0028] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0029] Figure 5This is a perspective view of the manual blackout roller blind of Example 2;

[0030] Figure 6 This is an exploded view of one of the supports of the manual blackout roller blind in Embodiment 2;

[0031] Figure 7 This is a schematic diagram of the structure of another bracket for the manual blackout roller blind in Embodiment 2;

[0032] Figure 8 This is a schematic diagram of the cooperation between the pull cord and the rotating block of the manual blackout roller blind in Example 2;

[0033] Figure 9 This is the installation front view of existing technology that does not have a light-shielding structure;

[0034] Figure 10 This is the main installation view of the manual blackout roller blind of this application;

[0035] The labels for each item are as follows:

[0036] 1. Light-shielding groove; 2. Light-shielding plate; 3. Fixing component; 4. Gasket; 5. Bracket; 6. Roller; 7. Curtain; 8. Transmission assembly; 9. Pull cord; 11. Limiting block; 12. Clearance part; 21. Notch; 22. D-shaped sealing strip; 51. Strip-shaped through hole; 52. First connecting hole; 53. Third connecting hole; 54. Support block; 55. Pressure rod; 56. Pressure block; 71. Sealing counterweight block; 81. Outer shell; 82. Support plate; 83. Driven gear; 84. Rotating block; 91. Locking block; 111. Connecting column; 112. Blind hole; 541. Support part; 811. Second connecting hole; 821. Protrusion; 822. Drive block; 823. Connecting shaft; 841. Fixing block; 842. Drive gear; 843. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] Among them, for Figure 9 and Figure 10 It should be specifically explained that, in order to highlight the advantages of this application, Figure 9 The area with the cross-section is the light leakage area.

[0039] Example 1

[0040] refer to Figures 1-4A light-blocking structure for a manual light-blocking roller blind includes a light-blocking groove 1, a light-blocking plate 2, and a fixing member 3. The light-blocking groove 1 is symmetrically arranged on the external wall, and the side of the light-blocking groove 1 facing away from its groove opening is connected to the wall. Each of the two light-blocking grooves 1 has a limiting block 11 on the side near the external window. The light-blocking plate 2 has a notch 21 that matches the position of the limiting block 11. The limiting block 11 and the notch 21 cooperate to restrict the light-blocking plate 2 from moving horizontally along the arrangement direction of the light-blocking groove 1, and the light-blocking plate 2 can move vertically.

[0041] When the notch 21 is engaged with the limiting block 11, both sides of the light-shielding plate 2 are in contact with the wall; when the top of the light-shielding plate 2 is in contact with the top wall where a manual light-shielding roller blind is installed, the light-shielding groove 1 can completely block the notch 21; the fixing member 3 is detachably connected to the limiting block 11, and the fixing member 3 is used to press the light-shielding plate 2 against the side of the light-shielding groove 1 near the window.

[0042] Before describing this embodiment, it is necessary to explain the application scenario of this application. This application is applicable to bay window locations on both side walls, and can also be installed when manual blackout roller blinds are already installed. This embodiment mainly describes the installation when manual blackout roller blinds are already in place.

[0043] In this design, the user first connects the blackout groove 1 to the walls on both sides, and then inserts the two sides of the curtain 7 of the manual blackout roller blind into the blackout groove 1, so that the curtain 7 can rise and fall within the blackout groove 1. Then, the blackout plate 2 is inserted at an angle through the area of ​​the blackout groove 1 and positioned between the window and the blackout groove 1. The blackout groove 1 and the limiting block 11 are then pre-fitted together and pre-pressed by the fixing piece 3. The position of the blackout groove 1 in the vertical direction is then adjusted so that the top of the blackout groove 1 contacts the ceiling wall where the manual blackout roller blind is installed. The current position of the blackout groove 1 is then locked by the fixing piece 3 to complete the installation. At this time, the area between the two sides of the curtain 7 and the wall is blocked by the blackout groove 1, and the area of ​​the ceiling wall where the manual blackout roller blind is installed is blocked by the blackout plate 2, thus improving the blackout effect.

[0044] It should be noted that the specific connection method between the light-blocking groove 1 and the wall can be either a non-drilling method such as adhesive bonding, or a drilling method such as screws. Regarding the installation method of the manual light-blocking roller blind, it can be a method well-known to those skilled in the art: the two ends of the manual light-blocking roller blind contact the walls on both sides and are installed at the top wall position. The winding direction is as follows: with the window as the base point, winding from the window to the top wall is called rewinding; winding from the top wall to the window is called unwinding. This is the standard installation method and will not be described in detail in this embodiment.

[0045] It should also be noted that during the unrolling process of the curtain 7, as the outer diameter of the curtain 7 roll will continuously decrease, the curtain 7 will continuously move closer to its winding axis. Therefore, the opening of the light-blocking groove 1 should cover its winding axis and the edge of the curtain 7 roll near the window when it is fully rolled up.

[0046] Furthermore, the notch 21 is a rectangular structure with one end open, and the limiting block 11 is a cylindrical or cuboid structure. The size of the limiting block 11 matches the size of the notch 21, and the limiting block 11 is arranged near the top of the light-shielding groove 1.

[0047] In a preferred embodiment, the limiting block 11 has a cuboid structure; in other embodiments, the limiting block 11 has a cylindrical structure. Both methods can limit the position of the light-shielding plate 2, but the cuboid structure is more suitable for stability, while the cylindrical structure is more suitable for smooth movement in the vertical direction. The limiting block 11 is arranged near the top of the light-shielding groove 1, which can better control the length of the notch 21 and ensure that the light-shielding groove 1 can completely block the notch 21 when the light-shielding plate 2 contacts the top wall.

[0048] In this embodiment, the end of the limiting block 11 away from the light-shielding groove 1 has a chamfered edge. Specifically, by providing a chamfered edge at the end of the limiting block 11 away from the light-shielding groove 1, the area of ​​the vertical cross-section of the limiting block 11 along the window direction gradually decreases, which facilitates the engagement of the notch 21 with the limiting block 11. At the same time, the beveled surface formed by the chamfered edge can provide a guiding function.

[0049] In this embodiment, the light-blocking structure of the manual light-blocking roller blind also includes a gasket 4. The thickness of the limiting block 11 is less than the thickness of the light-blocking plate 2. The end of the limiting block 11 away from the light-blocking groove 1 has a connecting post 111. The middle part of the gasket 4 has a through hole that matches the connecting post 111. The gasket 4 is connected to the connecting post 111 through the through hole. At this time, the end of the connecting post 111 is located in the through hole.

[0050] The fastener 3 is detachably connected to the connecting column 111. The fastener 3 is used to press the gasket 4 onto the light shield 2 so as to press the light shield 2 onto the side of the light shield groove 1 near the window.

[0051] Specifically, by setting connecting posts 111 on the connecting block, the purpose is to connect the gasket 4. The gasket 4 increases the contact area with the light-shielding plate 2. At the same time, the gasket 4 disperses the local pressure when the fixing member 3 is under force, reduces stress concentration on the surface of the base material, and reduces the risk of deformation and cracking. In a specific embodiment, the gasket 4 can be made of silicone or stainless steel. An anti-slip layer, such as silicone, is applied to the side of the gasket 4 that contacts the light-shielding plate 2.

[0052] In this embodiment, the connecting post 111 has a blind hole 112, the depth of which extends into the limiting block 11. The inner wall of the blind hole 112 has threads, and the fastener 3 is a hand-tightening bolt or a wing bolt.

[0053] In practical use, hand-tightened bolts or wing bolts are used as fasteners 3, which can be tightened or loosened directly by hand without the need for wrenches, screwdrivers or other tools, making disassembly and assembly simple.

[0054] In a preferred embodiment, D-shaped sealing strips 22 are connected to both sides and the top of the light-shielding panel 2. The use of D-shaped sealing strips 22 ensures the fit between the sides of the light-shielding panel 2 and the side walls, and also ensures the fit between the top of the light-shielding panel 2 and the top wall. Preferably, the D-shaped sealing strips 22 are made of foam material and are soft and elastic to prevent damage to the wall caused by movement of the light-shielding panel 2. The D-shaped sealing strips 22 are commercially available and well-known to those skilled in the art. In other embodiments, materials that will not damage the wall, such as sponge or tightly packed ultra-fine soft bristles, can also be used.

[0055] It should also be noted that the purpose of the D-type sealing strip 22 is not to clamp the light-shielding plate 2 between the two walls, but only to ensure the fit between the sides and top of the light-shielding plate 2 and the wall. With the contact of the D-type sealing strip 22, it will not affect the up-and-down movement of the light-shielding plate 2 between the two walls.

[0056] Preferably, at least one light-blocking groove 1 has a relief portion 12 for the pull cord 9 of the manual light-blocking roller blind to pass through. Specifically, the relief portion 12 makes the side of the light-blocking groove 1 facing the user partially open, and the edge area of ​​the light-blocking groove 1 forming the relief portion 12 is rounded to prevent the pull cord 9 from getting stuck when it is pulled.

[0057] In this embodiment, for different sizes of bay windows, the length of the light-shielding groove 1 and the length of the light-shielding plate 2 can be customized according to the user's size. It is preferable to use plastic material, and it is a plastic material with low light transmittance and high hardness, so as to increase the color selection and color matching of the light-shielding groove 1 and the light-shielding plate 2. In addition, the plastic material is lightweight, and one person can install it.

[0058] Example 2

[0059] refer to Figures 5-10A manual blackout roller blind includes a bracket 5, a roller 6, a curtain 7, a pull cord 9, a transmission assembly 8, and the blackout structure of the manual blackout roller blind as described above. The brackets 5 are symmetrically arranged and connected to the external ceiling wall by screws. The transmission assembly 8 is connected to one of the brackets 5. The roller 6 is located between the symmetrically arranged brackets 5. One end of the roller 6 is rotatably connected to the bracket 5, and the other end is connected to the transmission assembly 8. The pull cord 9 is connected to the transmission assembly 8. One end of the curtain 7 is fixedly connected to the roller 6. The pull cord 9 is used to drive the transmission assembly 8 to rotate so as to drive the roller 6 to rotate, thereby winding or unwinding the curtain 7. Both sides of the curtain 7 are embedded in the blackout groove 1.

[0060] In this embodiment, the manual blackout roller blind can be a type of manual blackout roller blind well known to those skilled in the art. The bracket 5 is an L-shaped bracket 5, with a strip-shaped through hole 51 on its horizontal portion. This strip-shaped through hole 51 is used to install the bracket 5 on the top wall of the bay window, while the vertical portion contacts the wall.

[0061] The transmission assembly 8 includes a housing 81, a driven gear 83, a support plate 82, and a rotating block 84. The housing 81 is screwed to the vertical part of one of the brackets 5. The vertical part of the bracket 5 has a first connecting hole 52 in the middle. The inner peripheral wall of the housing 81 has teeth arranged in a circular array (not shown in the figure). The middle part of the housing 81 has a second connecting hole 811. One side of the support plate 82 has a protrusion 821 that matches the second connecting hole 811. The protrusion 821 has a driving block 822. The driving block 822 is a non-cylindrical structure and can be a cuboid or a cube structure. The other side of the support plate 82 has three connecting shafts 823 arranged in a circular array. The number of driven gears 83 matches the number of connecting shafts 823 and they are rotatably connected to the connecting shafts 823. The support plate 82 is connected to the rotating wheel of the second connecting hole 811 through the protrusion 821. At this time, the driving block 822 is located outside the housing 81, and the driven gear 83 meshes with the teeth of the inner peripheral wall of the housing 81.

[0062] The support plate 82 has a recess (not shown in the figure) in the middle of the side with the connecting shaft 823. The rotating block 84 has a fixedly connected drive gear 842 on one side. The drive gear 842 has a protrusion 843 that matches the recess. The rotating block 84 is rotatably connected to the recess through the protrusion 843. At this time, the drive gear 842 and all driven gears 83 mesh to form a planetary gear transmission. The outer peripheral wall of the rotating block 84 has fixed blocks 841 arranged in a circular array. The fixed blocks 841 are symmetrically arranged along the thickness direction of the rotating block 84. A gap is formed between adjacent symmetrically arranged fixed blocks 841 for the pull rope 9 to pass through. The pull rope 9 also has a locking block 91. The locking block 91 is located between two adjacent fixed blocks 841 along the outer peripheral wall of the rotating block 84. Since the fixed blocks 841 are symmetrically arranged, there are four fixed blocks 841. When used to pull the rope 9, the locking block 91 drives the rotating block 84 to rotate, which in turn drives the driving gear 842 to rotate. The driving gear 842 drives the driven gear 83 and the support plate 82 to rotate, which in turn drives the driving block 822 to rotate.

[0063] The drive block 822 is connected to one end of the drum 6. Specifically, the drum 6 may have a recess that matches the drive block 822, and the drive block 822 is inserted into the recess. In addition, a shaft is fixedly connected to the other end of the drum 6, and the shaft is rotatably connected to another bracket 5.

[0064] Another bracket 5 has a third connecting hole 53, a support block 54, and a pressure rod 55. The support block 54 has a U-shaped support portion 541, which communicates with the third connecting hole 53. One end of the pressure rod 55 is rotatably connected to the bracket 5, specifically by a semi-threaded bolt, so that the pressure rod 55 is located in the smooth part of the semi-threaded bolt. The other end of the pressure rod 55 has a first locking block (not shown in the figure), and the outer peripheral wall of the support block 54 has a second locking block (not shown in the figure). The pressure rod 55 is preferably made of an elastic material, and the pressure rod 55 can swing to engage with the second locking block. At this time, the pressure rod 55 closes the opening of the U-shaped support portion 541 and restricts the shaft within the U-shaped support portion 541. Preferably, the pressure rod 55 also has a pressure block 56, which can cooperate with the U-shaped support portion 541 to form a cylindrical area, which matches the outer diameter of the shaft. A sealing counterweight 71 is also provided at the free end of the curtain fabric 7, which is prior art in this field.

[0065] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A light-blocking structure for a manually operated blackout roller blind, comprising a light-blocking groove, a light-blocking plate, and a fixing component, wherein the light-blocking grooves are symmetrically arranged on an external wall, and the side of the light-blocking groove facing away from its opening is connected to the wall, characterized in that, Each of the two light-shielding slots has a limiting block on the side of the window near the external device. The light-shielding plate has a notch that matches the position of the limiting block. The limiting block and the notch cooperate to restrict the light-shielding plate from translating along the arrangement direction of the light-shielding slots, and the light-shielding plate can move in the vertical direction. When the notch engages with the limiting block, both sides of the light-shielding plate contact the wall; when the top of the light-shielding plate contacts the top wall where a manual light-shielding roller blind is installed, the light-shielding groove can completely block the notch; the fixing member is detachably connected to the limiting block, and the fixing member is used to press the light-shielding plate tightly against the side of the light-shielding groove near the window.

2. The light-blocking structure of the manual light-blocking roller blind according to claim 1, characterized in that, The notch is a rectangular structure open at one end, and the limiting block is a cylindrical or cuboid structure. The size of the limiting block matches the size of the notch, and the limiting block is arranged near the top of the light-shielding groove.

3. The light-blocking structure of the manual light-blocking roller blind according to claim 2, characterized in that, The end of the limiting block away from the light-shielding groove has a chamfered edge.

4. The light-blocking structure of the manual blackout roller blind according to claim 1, characterized in that, The light-blocking structure of the manual light-blocking roller blind also includes a gasket. The thickness of the limiting block is less than the thickness of the light-blocking plate. The end of the limiting block away from the light-blocking groove has a connecting post. The middle part of the gasket has a through hole that matches the connecting post. The gasket is connected to the connecting post through the through hole. At this time, the end of the connecting post is located in the through hole. The fastener is detachably connected to the connecting post. The fastener is used to press the gasket onto the light-shielding plate to press the light-shielding plate against the side of the light-shielding groove near the window.

5. The light-blocking structure of the manual blackout roller blind according to claim 4, characterized in that, The side of the pad that contacts the light-shielding plate has an anti-slip layer.

6. The light-blocking structure of the manual blackout roller blind according to claim 4, characterized in that, The connecting column has a blind hole that extends into the limiting block. The inner wall of the blind hole is threaded. The fastener is a hand-tightening bolt or a wing bolt.

7. The light-blocking structure of the manual light-blocking roller blind according to claim 1, characterized in that, The light-shielding plate is connected to D-shaped sealing strips on both sides and the top.

8. The light-blocking structure of the manual light-blocking roller blind according to claim 1, characterized in that, At least one of the light-blocking slots has a clearance portion for the pull cord of the manual light-blocking roller blind to pass through.

9. A manual blackout roller blind, comprising a bracket, a roller, a curtain fabric, a pull cord, a transmission assembly, and a blackout structure as described in any one of claims 1 to 8, characterized in that, The brackets are symmetrically arranged and connected to the top wall of the external installation by screws. The transmission assembly is connected to one of the brackets. The drum is located between the symmetrically arranged brackets. One end of the drum is rotatably connected to the bracket and the other end is connected to the transmission assembly. The pull cord is connected to the transmission assembly. One end of the curtain is fixedly connected to the drum. The pull cord is used to drive the transmission assembly to rotate, thereby driving the drum to rotate and rewind or unwind the curtain. Both sides of the curtain are embedded in the light-blocking groove.

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