A pull-down positioning roller blind

Abstract

This utility model provides a pull-down positioning roller blind, including a housing and a roller blind fabric. A winding cavity is formed inside the housing, and a roller shaft is rotatably connected within the winding cavity. The roller blind fabric is fixedly connected to the roller shaft. A constant force spring box and a limiting base are fixedly connected to both ends of the winding cavity. The constant force spring box is fixedly connected to the roller shaft. A magnetic limiting component is provided on the limiting base. A rotating base is fixedly fitted onto the outer circumference of the roller shaft, and a telescopic component is provided on the rotating base. The magnetic limiting component and the telescopic component are magnetically connected. A first slot is formed on one side wall of the winding cavity. This solution utilizes the magnetic attraction between the sliding rod (made of iron-cobalt-nickel) and the magnetic base, combined with the shape adaptation design of the first and second friction surfaces, to ensure that the static friction force of the roller blind fabric is greater than the spring force during positioning. Magnetic attraction triggers friction locking, thus achieving stable suspension without a buckle structure. This improves upon the problems of inaccurate positioning and cumbersome operation associated with buckle structures.

Description

Technical Field

[0001] This utility model relates to the field of roller blind technology, specifically a pull-down positioning roller blind. Background Technology

[0002] Traditional pull-down roller blinds often rely on mechanical latches or pure friction structures for positioning. Latch-type blinds have limited positioning positions and are cumbersome to operate; friction-type blinds are prone to instability and accidental slippage due to changes in the fabric condition or wear of components, resulting in insufficient reliability.

[0003] In addition, the rolling chamber of the roller blind has dynamic gaps at the curtain exit, which lack effective sealing, allowing dust and insects to easily enter, contaminating internal components such as springs and bearings, increasing the failure rate and shortening the equipment's lifespan.

[0004] Therefore, there is an urgent need for a pull-down positioning roller blind that can solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a pull-down positioning roller blind, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a pull-down positioning roller blind, characterized in that it includes a shell and a roller blind fabric. A winding cavity is provided inside the shell, and a roller shaft is rotatably connected within the winding cavity. The roller blind fabric is fixedly connected to the roller shaft. A constant force spring box and a limiting base are fixedly connected to both ends of the winding cavity. The constant force spring box is fixedly connected to the roller shaft. A magnetic limiting component is provided on the limiting base. A rotating base is fixedly sleeved on the outer circumference of the roller shaft. A telescopic component is provided on the rotating base. The magnetic limiting component and the telescopic component are magnetically connected. A first slot is provided on one side wall of the winding cavity.

[0009] Preferably, the telescopic assembly includes a plurality of sliding sleeves, a plurality of first springs, and a plurality of sliding rods. The rotating base has a plurality of first openings on the side near the limiting base. The sliding sleeves are fixedly connected to the first openings. The sliding rods are slidably connected to the sliding sleeves. One end of the first spring is fixedly connected to one end wall of the first opening, and the other end of the first spring is fixedly connected to the sliding rod.

[0010] Preferably, the magnetic limiting component includes a magnetic base, the limiting base having an annular groove on the side near the rotating base, and a plurality of magnetic bases fixedly connected to the side of the annular groove away from the rotating base.

[0011] Preferably, the sliding rod has a first friction surface at one end near the limiting base, and the magnetic base has a second friction surface at one end near the rotating base, wherein the shape and size of the first friction surface and the second friction surface are adapted to each other.

[0012] Preferably, a third slot is provided on both sides of the first slot, and a plurality of second springs are fixedly connected in the third slot. One end of the second spring is fixedly connected to one side wall of the third slot, and the other end of the second spring is fixedly connected to a brush. The brush is slidably connected to the third slot.

[0013] Preferably, the two sides of the brush away from the second spring are provided with arc surfaces.

[0014] (III) Beneficial Effects

[0015] This utility model provides a pull-down positioning roller blind. It has the following beneficial effects:

[0016] 1. This solution utilizes the magnetic attraction between the sliding rod made of iron-cobalt-nickel material and the magnetic base, combined with the shape adaptation design of the first and second friction surfaces, to make the static friction force of the roller blind cloth greater than the spring force when positioning. The friction lock is triggered by magnetic adsorption, thus achieving stable suspension without the need for a buckle structure. This improves the problems of inaccurate positioning and cumbersome operation of buckle structures.

[0017] 2. This solution uses a spring-loaded sliding brush at the roller shutter exit, with an arc-shaped side surface that adapts to fit the roller shutter, to form an elastic sealing barrier at the opening of the winding cavity. This prevents dust and insects from entering, thereby reducing the failure rate of components inside the winding cavity and extending the equipment's lifespan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a top view of the structure of this utility model;

[0020] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of AA;

[0021] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of BB;

[0022] Figure 5 for Figure 3 A magnified structural diagram of C.

[0023] In the diagram: 11. Outer shell; 12. Winding cavity; 13. Reel; 14. Constant force spring barrel; 15. Limiting base; 16. Rotating base; 17. First slot; 18. Roller curtain; 20. First opening; 21. Sliding sleeve; 22. First spring; 23. Sliding rod; 24. First friction surface; 25. Annular slot; 26. Magnetic base; 27. Second friction surface; 30. Third slot; 31. Second spring; 32. Brush. Detailed Implementation

[0024] This utility model embodiment provides a pull-down positioning roller blind, such as Figure 1-5 As shown, it includes a housing 11, a winding cavity 12, a winding shaft 13, a constant force spring box 14, a limiting base 15, a rotating base 16, a first slot 17, a roller blind 18, a first opening 20, a sliding sleeve 21, a first spring 22, a sliding rod 23, a first friction surface 24, an annular slot 25, a magnetic base 26, a second friction surface 27, a third slot 30, a second spring 31, and a brush 32.

[0025] like Figure 1-5 As shown, a winding cavity 12 is provided inside the outer casing 11. A roller 13 is rotatably connected inside the winding cavity 12. A roller blind 18 is fixedly connected to the roller 13. A handle is provided at the end of the roller blind 18 away from the roller 13. A constant force spring box 14 and a limiting base 15 are fixedly connected to both ends of the winding cavity 12. The constant force spring box 14 is existing technology. The constant force spring box 14 can generate a constant elastic force on the roller 13. The constant force spring box 14 is fixedly connected to the roller 13. A magnetic limiting component is provided on the limiting base 15. A rotating base 16 is fixedly sleeved on the outer circular surface of the roller 13. A telescopic component is provided on the rotating base 16. The magnetic limiting component and the telescopic component are magnetically connected. A first slot 17 is provided on one side wall of the winding cavity 12.

[0026] The telescopic assembly includes several sliding sleeves 21, several first springs 22, and several sliding rods 23. The rotating base 16 has several first openings 20 on the side near the limiting base 15. The sliding sleeves 21 are fixedly connected to the first openings 20. The sliding rods 23 are slidably connected to the sliding sleeves 21. One end of the first spring 22 is fixedly connected to one end wall of the first opening 20, and the other end of the first spring 22 is fixedly connected to the sliding rod 23. The sliding rods 23 are made of iron-cobalt-nickel alloy.

[0027] The magnetic limiting component includes a magnetic base 26. The limiting base 15 has an annular groove 25 on the side near the rotating base 16. Several magnetic bases 26 are fixedly connected to the side of the annular groove 25 away from the rotating base 16. The sliding rod 23 has a first friction surface 24 at the end near the limiting base 15, and a second friction surface 27 at the end of the magnetic base 26 near the rotating base 16. The shape and size of the first friction surface 24 and the second friction surface 27 are adapted to each other.

[0028] Both sides of the first slot 17 are provided with third slots 30. Several second springs 31 are fixedly connected in the third slots 30. One end of the second spring 31 is fixedly connected to one side wall of the third slot 30, and the other end of the second spring 31 is fixedly connected to a brush 32. The brush 32 is slidably connected to the third slot 30. Both sides of the brush 32 away from the second spring 31 are provided with arc surfaces. The setting of the brush 32 ensures that external dust and insects are difficult to enter the winding cavity 12, thereby improving the service life of this solution and reducing the failure rate of this solution.

[0029] When the roller blind is positioned, the handle on the roller blind 18 is pulled. The handle moves the roller blind 18 through the first slot 17 away from the outer casing 11. At this time, the roller blind 18 compresses the constant force spring box 14 through the roller shaft 13. The constant force spring box 14 generates a constant elastic force on the roller shaft 13. When the roller blind 18 is pulled to the appropriate position, it is slowly released. The constant force spring box 14 drives the roller shaft 13 to rotate. The roller shaft 13 drives the rotating base 16 to rotate until the first friction surface 24 on the sliding rod 23 corresponds to the second friction surface 27 on the magnetic base 26. The magnetic base 26 attracts the sliding rod 23 with magnetism until the static friction between the second friction surface 27 and the first friction surface 24 increases, thereby locking the roller shaft 13. Then it is completely released. At this time, the static friction between the second friction surface 27 and the first friction surface 24 is greater than the constant elastic force generated by the constant force spring box 14 on the roller shaft 13.

[0030] When the roller blind is being rolled up, the handle on the roller blind 18 is pulled. The handle moves the roller blind 18 through the first slot 17 in a direction away from the outer casing 11. At this time, the roller blind 18 compresses the constant force spring box 14 through the roller shaft 13. The constant force spring box 14 generates a constant elastic force on the roller shaft 13. Then, the handle is quickly released, and the constant force spring box 14 drives the roller shaft 13 to rotate. At this time, there is a sliding friction between the first friction surface 24 on the sliding rod 23 and the second friction surface 27 on the magnetic base 26. This sliding friction is less than the constant elastic force generated by the constant force spring box 14 on the roller shaft 13. Therefore, the constant force spring box 14 drives the roller shaft 13 to roll up the roller blind 18.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pull-down positioning roller blind, characterized in that: The device includes an outer shell (11) and a roller blind (18). The outer shell (11) has a winding cavity (12) inside. A roller (13) is rotatably connected inside the winding cavity (12). The roller blind (18) is fixedly connected to the roller (13). A constant force spring box (14) and a limiting base (15) are fixedly connected to both ends of the winding cavity (12). The constant force spring box (14) is fixedly connected to the roller (13). A magnetic limiting component is provided on the limiting base (15). A rotating base (16) is fixedly sleeved on the outer circular surface of the roller (13). A telescopic component is provided on the rotating base (16). The magnetic limiting component and the telescopic component are magnetically connected. A first slot (17) is provided on one side wall of the winding cavity (12).

2. The pull-down positioning roller blind according to claim 1, characterized in that: The telescopic assembly includes several sliding sleeves (21), several first springs (22), and several sliding rods (23). The rotating base (16) has several first openings (20) on the side near the limiting base (15). The sliding sleeves (21) are fixedly connected to the first openings (20). The sliding rods (23) are slidably connected to the sliding sleeves (21). One end of the first spring (22) is fixedly connected to one end wall of the first opening (20), and the other end of the first spring (22) is fixedly connected to the sliding rod (23).

3. A pull-down positioning roller blind according to claim 2, characterized in that: The magnetic limiting component includes a magnetic base (26). The limiting base (15) has an annular groove (25) on the side close to the rotating base (16). A plurality of magnetic bases (26) are fixedly connected to the side of the annular groove (25) away from the rotating base (16).

4. A pull-down positioning roller blind according to claim 3, characterized in that: The sliding rod (23) has a first friction surface (24) at one end near the limiting base (15), and the magnetic base (26) has a second friction surface (27) at one end near the rotating base (16). The first friction surface (24) and the second friction surface (27) are adapted to each other in shape and size.

5. A pull-down positioning roller blind according to claim 1, characterized in that: The first slot (17) has a third slot (30) on both sides. A plurality of second springs (31) are fixedly connected in the third slot (30). One end of the second spring (31) is fixedly connected to one side wall of the third slot (30), and the other end of the second spring (31) is fixedly connected to a brush (32). The brush (32) is slidably connected to the third slot (30).

6. A pull-down positioning roller blind according to claim 5, characterized in that: The brush (32) has curved surfaces on both sides of the end away from the second spring (31).

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