Spring roller blind device with double torsion spring and curtain

Abstract

The utility model relates to a window curtain technical field discloses a spring roller device and window curtain with double torsion spring, including spring stick, rotating sleeve and rotation plug, spring stick connects between rotating sleeve and rotation plug, rotating sleeve and rotation plug all rotating sleeve are established in spring stick outside, the first torsion spring and second torsion spring are connected between rotating sleeve and rotation plug, the diameter of second torsion spring is greater than the diameter of first torsion spring, second torsion spring sleeve is established in first torsion spring outside, the direction of first torsion spring torsion and the direction of second torsion spring torsion are same. The utility model discloses the first torsion spring and second torsion spring of coaxial sleeve setting, same direction torsion, compared with single torsion spring, can when the torsion same number of turns output torsion value change smaller, reduce integral torsion value gradient, make the roller device lifting process torque change more smooth, realize window curtain more accurate, steady hover, and use experience is good.

Description

Technical Field

[0001] This utility model relates to the field of curtain technology, specifically to a spring roller blind with double torsion springs and a curtain. Background Technology

[0002] Spring roller blinds are a common component in roller blind products, used to raise and lower the blinds. In typical spring roller blinds, the tension of the inner limiting spring is fixed, making it difficult for users to adjust or change it as needed. Chinese utility model patent number 202420955654.9 discloses an adjustable preload spring roller blind. Its key technical features include a spring rod, a rotating disk, and a limiting spring fitted onto the spring rod. One end of the spring rod is detachably connected to a positioning element, and a rotating plug is rotatably connected to the positioning element. The positioning element is fixedly connected to one end of the spring rod, and a first mounting groove is provided on the positioning element. One end of the spring rod is placed in the first mounting groove. A first locking bolt for locking one end of the spring rod is threaded onto the positioning element, and a first threaded hole corresponding to the first locking bolt is provided on the positioning element. The positioning element and the spring rod are fixed by the first locking bolt, eliminating the need to drill holes in the spring rod, thus not weakening its structural strength and preventing breakage.

[0003] However, in the aforementioned patents or some existing spring roller blinds, a single limiting spring (i.e., a torsion spring) is typically built-in, using its preload to achieve the raising, lowering, and positioning of the blind. However, this type of structure generally suffers from a significant drawback: the tension of its internal torsion spring is fixed at the factory, making it difficult for users to flexibly adjust it according to the actual weight of the blinds, the usage environment, or personal preferences, thus limiting the product's applicability and personalization needs. Because only a single torsion spring is used, the spring wire diameter is usually designed to be relatively thick to provide sufficient torque. The increased wire diameter directly leads to greater spring stiffness, resulting in a significantly larger change in force per unit rotation (i.e., force gradient). In practical use, this manifests as a smaller number of effective rotations available to the spring, and within a limited range of rotations, the torque output varies drastically. For example, a spring with a thicker wire diameter may experience a sharp increase in torque from 0N to 20N within a rotation range of 0 to 50 rotations. Its effective working range (e.g., 25 to 50 rotations) corresponds to a force variation range (10N to 20N) that is too large, making it difficult to achieve stable and precise suspension of the curtain at multiple positions during the raising and lowering process. Users often need to make repeated fine adjustments to find the balance point, which is cumbersome and results in a poor user experience. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model provides a spring roller shutter with double torsion springs, comprising a spring rod, a rotating sleeve, and a rotating plug. The spring rod is connected between the rotating sleeve and the rotating plug. Both the rotating sleeve and the rotating plug are rotatably fitted onto the outside of the spring rod. A first torsion spring and a second torsion spring are connected between the rotating sleeve and the rotating plug. The diameter of the second torsion spring is larger than the diameter of the first torsion spring. The second torsion spring is fitted onto the outside of the first torsion spring. The direction of the torsional force on the first torsion spring is different from that of the second torsion spring. The directions of the torsional forces on the springs are the same. In use, the rotating sleeve and the rotating plug rotate relative to each other, so that the first torsion spring and the second torsion spring undergo torsional deformation simultaneously, so that the first torsion spring and the second torsion spring generate torque in the same direction. This utility model adopts a coaxially sleeved, same-direction torsion first torsion spring and a second torsion spring. Compared with a single torsion spring, it can output a smaller change in torque value when tortuous for the same number of turns, reduce the overall torque value gradient, make the torque change during the raising and lowering process of the roller blind smoother, achieve more precise and stable suspension of the curtain, and provide a better user experience.

[0005] Optionally, the rotating sleeve is provided with a first connecting post and a second connecting post, the diameter of the first connecting post being smaller than the diameter of the second connecting post; the rotating plug is provided with a third connecting post and a fourth connecting post, the diameter of the third connecting post being smaller than the diameter of the fourth connecting post; the two ends of the first torsion spring are respectively sleeved on the first connecting post and the third connecting post; and the two ends of the second torsion spring are respectively sleeved on the second connecting post and the fourth connecting post.

[0006] Optionally, the first connecting post is disposed on the side end of the rotating sleeve near the rotating plug, the second connecting post is disposed on the side end of the first connecting post near the rotating plug, the first connecting post and the second connecting post are coaxially arranged, the third connecting post is disposed on the side end of the rotating plug near the rotating sleeve, and the fourth connecting post is disposed on the side end of the third connecting post near the rotating sleeve, the third connecting post and the fourth connecting post are coaxially arranged.

[0007] Optionally, the first connecting post is provided with a first threaded groove corresponding to the first torsion spring, the third connecting post is provided with a second threaded groove, one end of the first torsion spring is threadedly connected to the first threaded groove, the other end of the first torsion spring is threadedly connected to the second threaded groove, one end of the first connecting post is provided with a first guide slope in an annular shape, and one end of the third connecting post is provided with a second guide slope in an annular shape; the inner side of one end of the second torsion spring is tightly connected to the outer side of the second connecting post, and the inner side of the other end of the second torsion spring is tightly connected to the outer side of the fourth connecting post.

[0008] Optionally, the rotating sleeve is slidably connected to the spring bar along the axial direction of the spring bar.

[0009] Optionally, the rotating sleeve is provided with a limiting mechanism to limit the maximum rising position of the curtain. The limiting mechanism includes a screw and a limiting nut. The screw is slidably sleeved on the spring bar along the axial direction of the spring bar. The screw rotates synchronously with the spring bar. The limiting nut is threaded to the outside of the screw. The screw is provided with a stop portion for stopping the limiting nut from being positioned. A protrusion is provided on the outside of the limiting nut. A limiting groove is provided on the inner side of the rotating sleeve along its own axial direction. The protrusion is slidably placed in the limiting groove so that the limiting nut can slide along the axial direction of the rotating sleeve, and the limiting nut rotates synchronously with the rotating sleeve.

[0010] Optionally, the screw is provided with a first limiting protrusion, and the rotating sleeve is provided with a first limiting annular groove for limiting the displacement of the first limiting protrusion along the axial direction of the screw. The first limiting protrusion is rotatably disposed within the first limiting annular groove along the circumferential direction of the rotating sleeve. A fixed positioning member is sleeved on the inner side of the rotating plug, and a second limiting protrusion is provided on the outer side of the positioning member. The rotating plug is provided with a second limiting annular groove for limiting the displacement of the second limiting protrusion along the axial direction of the screw. The second limiting protrusion is rotatably disposed within the second limiting annular groove along the circumferential direction of the rotating plug.

[0011] Optionally, the rotating sleeve is provided with a first splicing block separately, and the rotating sleeve is provided with a first fixing block integrally. The first splicing block includes a first half-cylinder and a second half-cylinder integrally connected, and the first fixing block includes a third half-cylinder and a fourth half-cylinder integrally connected. The first half-cylinder and the third half-cylinder are spliced ​​together to form the first connecting post, and the second half-cylinder and the fourth half-cylinder are spliced ​​together to form the second connecting post. The second half-cylinder is provided with a first locking block and a first locking groove, and the fourth half-cylinder is provided with a second locking groove that corresponds to the first locking block and a second locking block that corresponds to the first locking groove. The rotating sleeve is provided with a third locking block on its side near the first splicing block, and the second half-cylinder is provided with a third locking groove that corresponds to the third locking block.

[0012] Optionally, the rotating plug is provided with a second splicing block separately, and a second fixing block is integrally provided on the rotating plug. The second splicing block includes a fifth half-cylinder and a sixth half-cylinder integrally connected, and the second fixing block includes a seventh half-cylinder and an eighth half-cylinder integrally connected. The fifth half-cylinder and the seventh half-cylinder are spliced ​​together to form the third connecting post, and the sixth half-cylinder and the eighth half-cylinder are spliced ​​together to form the fourth connecting post. A fourth locking block is provided on the eighth half-cylinder, and a fourth locking groove is provided on the sixth half-cylinder to engage with the fourth locking block. A fifth locking block is provided on the side end of the rotating plug near the sixth half-cylinder, and a fifth locking groove is provided on the sixth half-cylinder to engage with the fifth locking block.

[0013] Compared to existing technologies, the spring roller blind with dual torsion springs in this invention uses a first torsion spring and a second torsion spring that are coaxially mounted and twist in the same direction. Compared to a single torsion spring, the output torque value changes less when twisting the same number of times, reducing the overall torque value gradient. This makes the torque change during the lifting and lowering process of the roller blind smoother, achieving more precise and stable suspension of the curtain and providing a better user experience.

[0014] In addition, this utility model also provides a curtain, including the above-mentioned spring roller blind with double torsion spring. This curtain also has the same beneficial effects as the above-mentioned spring roller blind with double torsion spring, which will not be described in detail here. Attached Figure Description

[0015] Figure 1 This is a perspective view of the spring roller shutter with double torsion springs according to the present invention;

[0016] Figure 2 This is a cross-sectional view of the spring roller shutter with double torsion springs according to the present invention;

[0017] Figure 3 for Figure 2 Enlarged view of section A;

[0018] Figure 4 for Figure 2 Enlarged view of section B;

[0019] Figure 5 for Figure 2 Enlarged view of section C;

[0020] Figure 6 This is a schematic diagram of the first torsion spring part of the spring roller shutter with double torsion springs according to this utility model;

[0021] Figure 7 for Figure 6 Enlarged view of section D in the middle;

[0022] Figure 8 for Figure 6 Enlarged view of section E in the middle;

[0023] Figure 9 This is a schematic diagram of the rotating sleeve part of the spring roller shutter with double torsion springs according to this utility model;

[0024] Figure 10 This is a schematic diagram of the limiting slide groove of the spring roller shutter with double torsion springs according to this utility model;

[0025] Figure 11 This is a schematic diagram of the limiting nut of the spring roller shutter with double torsion springs according to this utility model;

[0026] Figure 12 This is a schematic diagram of the rotating plug part of the spring roller shutter with double torsion springs according to this utility model;

[0027] Figure 13 This is a schematic diagram of the second limiting ring groove of the spring roller shutter with double torsion springs according to this utility model;

[0028] The component names corresponding to the various reference numerals in the figure are as follows: 1 is spring rod, 101 is positioning groove, 2 is rotating sleeve, 201 is limiting slide groove, 202 is first limiting ring groove, 203 is third locking block, 21 is first connecting post, 211 is first threaded groove, 212 is first guide slope, 22 is second connecting post, 3 is rotating plug, 31 is third connecting post, 311 is second threaded groove, 312 is second guide slope, 32 is fourth connecting post, 301 is second limiting ring groove, 302 is fifth locking block, 41 is first torsion spring, 42 is second torsion spring, 51 is screw, 511 is stop part, 512 is first limiting protrusion, 513 is positioning tooth, 52 is limiting nut, 521 is protrusion, 6 is positioning Components: 601 is the second limiting protrusion, 71 is the first splicing block, 711 is the first half-pillar, 712 is the second half-pillar, 7121 is the first locking block, 7122 is the first locking groove, 7123 is the third locking groove, 72 is the first fixing block, 721 is the third half-pillar, 722 is the fourth half-pillar, 7221 is the second locking groove, 7222 is the second locking block, 81 is the second splicing block, 811 is the fifth half-pillar, 812 is the sixth plate pillar, 8121 is the fourth locking groove, 8122 is the fifth locking groove, 82 is the second fixing block, 821 is the seventh half-pillar, 822 is the eighth half-pillar, 8221 is the fourth locking block, 8222 is the fifth locking groove, 9 is the adjusting turntable, 901 is the mounting groove, and 10 is the clamping spring. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0032] See Figures 1-13 This utility model provides a spring roller shutter with double torsion springs, including a spring rod 1, a rotating sleeve 2, and a rotating plug 3. The spring rod 1 is connected between the rotating sleeve 2 and the rotating plug 3. Both the rotating sleeve 2 and the rotating plug 3 are rotatably sleeved on the outside of the spring rod 1. A first torsion spring 41 and a second torsion spring 42 are connected between the rotating sleeve 2 and the rotating plug 3. The diameter of the second torsion spring 42 is larger than the diameter of the first torsion spring 41. The second torsion spring 42 is sleeved on the outside of the first torsion spring 41. The direction of the torsional force on the first torsion spring 41 is the same as the direction of the torsional force on the second torsion spring 42. In use, the rotating sleeve 2 and the rotating plug 3 rotate relative to each other. The first torsion spring 41 and the second torsion spring 42 are rotated to cause them to twist and deform simultaneously, so that the first torsion spring 41 and the second torsion spring 42 generate torque in the same direction. In use, the total torque generated by the first torsion spring 41 and the second torsion spring 42 is used to balance the weight of the curtain, thereby realizing the suspension function of the curtain. This utility model adopts a coaxially sleeved and unidirectionally torsion first torsion spring and second torsion spring. Compared with a single torsion spring, it can output a smaller torque value change when twisting for the same number of turns, reduce the overall torque value gradient, make the torque change during the raising and lowering process of the roller blind smoother, and achieve more precise and stable suspension of the curtain, resulting in a better user experience.

[0033] Specifically, this embodiment employs a first torsion spring 41 and a second torsion spring 42 with different diameters. The two torsion springs have different stiffnesses; the smaller-diameter first spring provides a basic, gentle torque, enabling fine adjustment under light loads; the larger-diameter second spring provides significant torque supplementation when needed. Their coordinated operation results in a wider total torque output range and a more linear and smooth force change throughout the entire working range. The aforementioned spring diameter refers to the median diameter of each of the first torsion spring 41 and the second torsion spring 42. Because two torsion springs provide sufficient torque, the wire diameters of the first torsion spring 41 and the second torsion spring 42 can be set very fine, smaller than the wire diameter of a single torsion spring in the prior art, resulting in smaller torque variation with the number of turns and a more stable torque output. Combining two torsion springs of different sizes facilitates flexible adaptation to curtains of different weights and sizes, enhancing versatility. Simultaneously, distributing the total load across the two springs helps reduce fatigue stress on individual springs, improving overall service life and reliability.

[0034] See Figures 1-4 The rotating sleeve 2 is provided with a first connecting post 21 and a second connecting post 22. The diameter of the first connecting post 21 is smaller than the diameter of the second connecting post 22. The rotating plug 3 is provided with a third connecting post 31 and a fourth connecting post 32. The diameter of the third connecting post 31 is smaller than the diameter of the fourth connecting post 32. The two ends of the first torsion spring 41 are respectively sleeved on the first connecting post 21 and the third connecting post 31, and the two ends of the second torsion spring 42 are respectively sleeved on the second connecting post 22 and the fourth connecting post 32. This provides independent mounting positions for the two springs, making it less likely for the two torsion springs to interfere with each other when rotating or deformed under force, thus ensuring the reliability and durability of the operation.

[0035] See Figures 1-4 The first connecting post 21 is located on the side end of the rotating sleeve 2 near the rotating plug 3, and the second connecting post 22 is located on the side end of the first connecting post 21 near the rotating plug 3. The first connecting post 21 and the second connecting post 22 are coaxial. The third connecting post 31 is located on the side end of the rotating plug 3 near the rotating sleeve 2, and the fourth connecting post 32 is located on the side end of the third connecting post 31 near the rotating sleeve 2. The third connecting post 31 and the fourth connecting post 32 are coaxial. The coaxial arrangement of the first connecting post 21 and the second connecting post 22, along with the coaxial arrangement of the third connecting post 31 and the fourth connecting post 32, ensures that the two springs can rotate around the same central axis when torsion, avoiding the risk of additional friction, vibration or jamming caused by misalignment, and ensuring that the two torsion springs can output torque smoothly and synchronously.

[0036] See Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 12The first connecting post 21 has a first threaded groove 211 corresponding to the first torsion spring 41, and the third connecting post 31 has a second threaded groove 311. One end of the first torsion spring 41 is threadedly connected to the first threaded groove 211, and the other end of the first torsion spring 41 is threadedly connected to the second threaded groove 311. One end of the first connecting post 21 has a first guide slope 212 arranged in annularly, and one end of the third connecting post 31 has a second guide slope 312 arranged in annularly. The inner side of one end of the second torsion spring 42 is tightly connected to the outer side of the second connecting post 22, and the inner side of the other end of the second torsion spring 42 is tightly connected to the outer side of the fourth connecting post 32. The diameter of one end of the second torsion spring 42 is slightly smaller than the diameter of the second connecting post 22, so that... One end of the second torsion spring 42 can be tightly gripped on the outside of the second connecting post 22 and rotate synchronously with the second connecting post 22; the diameter of the other end of the second torsion spring 42 is slightly smaller than that of the second fourth connecting post 32, so that the other end of the second torsion spring 42 can be tightly gripped on the outside of the fourth connecting post 32 and rotate synchronously with the fourth connecting post 32; the first threaded groove 211, the second threaded groove 311 and the threaded connection of the two ends of the first torsion spring 41 form a firm mechanical interlock, ensuring that the spring will not disengage or slip off the connecting post when repeatedly twisted, providing a stable torque transmission basis; the first guide slope 212 and the second guide slope 312 can guide the end of the first torsion spring 41 to smoothly fit into the corresponding threaded groove, which is convenient for assembly.

[0037] See Figure 2 , Figure 3 and Figure 5 The rotating sleeve 2 is slidably connected to the spring rod 1 along the axial direction of the spring rod 1; this allows the first torsion spring 41 and the second torsion spring 42 to extend freely when the curtain is pulled up and lowered during use, thereby compensating for the length change of the torsion spring during rotation and stabilizing the torque output; specifically, in the prior art, when the torsion spring is tightened, its diameter decreases and the number of coils increases, resulting in the total length of the spring elongating. The traditional fixed-gap structure will suppress this natural deformation, causing the spring to bear additional axial stress, resulting in torque fluctuation and abnormal noise; in this embodiment, the axial sliding function of the rotating sleeve 2 provides space for the free extension and contraction of the spring during the torsion process, absorbing its length change, which eliminates the internal stress caused by axial restraint, ensuring that the spring undergoes pure torsional deformation, thereby making its torque output smoother and more stable, and improving its service life.

[0038] See Figure 2 , Figure 3 and Figure 5The rotating sleeve 2 is equipped with a limiting mechanism to limit the maximum upward position of the curtain. The limiting mechanism includes a screw 51 and a limiting nut 52. The screw 51 is slidably sleeved on the spring rod 1 along its axial direction, and rotates synchronously with the spring rod 1. The limiting nut 52 is threaded to the outside of the screw 51. The screw 51 has a stop part 511 for stopping the limiting nut 52. A protrusion 521 is provided on the outside of the limiting nut 52. A limiting groove 201 is provided on the inner side of the rotating sleeve 2 along its own axial direction. The protrusion 521 slides within the limiting groove 201, allowing the limiting nut 52 to slide along the axial direction of the rotating sleeve 2, and the limiting nut 52 rotates synchronously with the rotating sleeve 2. When the curtain rises or falls, the rotating sleeve 2 rotates, and the protrusion 521 cooperates with the limiting groove 201. The limiting nut 52 rotates synchronously with the rotating sleeve 2. However, since the limiting nut 52 is threaded onto the fixed screw 51, it will move axially along the screw 51 while rotating. When the curtain rises, the rotating sleeve 2 rotates in the forward direction. At this time, the limiting nut 52 moves towards the stop part 511. When the curtain moves to the upper limit position, the limiting nut 52 is blocked by the stop part 511, thus limiting the continued forward rotation of the limiting nut 52 and the rotating sleeve 2. The rotation of the rotating sleeve 2 is forcibly stopped, thereby limiting the upper limit position of the curtain and setting a clear rising endpoint for the curtain, which is convenient for user operation. This prevents the curtain from being over-rolled in, which would cause the spring preload to be over-released, thereby disrupting the force balance of the system and ensuring the reliability of the lifting and hovering functions. At the same time, it prevents the curtain from jamming due to inertia and exceeding the upper limit, ensuring safe and controllable use.

[0039] See Figure 3 , Figure 4 , Figure 9 , Figure 12 and Figure 13The screw 51 is provided with a first limiting protrusion 512, and the rotating sleeve 2 is provided with a first limiting annular groove 202 for limiting the displacement of the first limiting protrusion 512 along the axial direction of the screw 51. The first limiting protrusion 512 is rotatably disposed in the first limiting annular groove 202 along the circumferential direction of the rotating sleeve 2. A fixed positioning member 6 is sleeved on the inner side of the rotating plug 3, and a second limiting protrusion 601 is provided on the outer side of the positioning member 6. The rotating plug 3 is provided with a second limiting annular groove 301 for limiting the displacement of the second limiting protrusion 601 along the axial direction of the screw 51. The second limiting protrusion 601 is rotatably disposed in the second limiting annular groove 301 along the circumferential direction of the rotating plug 3. This structure achieves axial positioning and free circumferential rotation of key components through the cooperation of the protrusion and the annular groove. Specifically, it positions the screw 51 and the rotating sleeve 2, and the positioning member 6 and the rotating plug 3 axially to prevent axial movement during operation, thereby ensuring the effective working length and stability of the preload of the internal double springs. It eliminates the need for bolts to axially position the screw 51 and the rotating sleeve 2, and the positioning member 6 and the rotating plug 3, ensuring a reliable structure and avoiding loosening issues that can occur with bolts. In this embodiment, the screw 51 is provided with positioning teeth 513, and the spring rod 1 is provided with positioning grooves 101 that engage with the positioning teeth 513. During assembly, the positioning teeth 513 engage with the positioning grooves 101 to limit the circumferential position of the screw 51 and the spring rod 1. Furthermore, the positioning member 6 is also provided with the same positioning teeth to limit the circumferential position of the positioning member 6 and the spring rod 1.

[0040] See Figure 2 , Figure 3 and Figure 9The rotating sleeve 2 is provided with a first splicing block 71 separately and a first fixing block 72 integrally provided. The first splicing block 71 includes a first half-pillar 711 and a second half-pillar 712 integrally connected. The first fixing block 72 includes a third half-pillar 721 and a fourth half-pillar 722 integrally connected. The first half-pillar 711 and the third half-pillar 721 are spliced ​​together to form a first connecting post 21, and the second half-pillar 712 and the fourth half-pillar 722 are spliced ​​together to form a second connecting post 22. The second half-pillar 712 is provided with a first locking block 7121 and a first locking groove 7122. The fourth half-pillar 722 is provided with a second locking groove 7221 that corresponds to the first locking block 7121 and a second locking block 7222 that corresponds to the first locking groove 7122. The rotating sleeve 2 is provided with a third locking block 203 near the side end of the first splicing block 71, and the second half-pillar 712 is provided with a corresponding locking block 203. The third slot 7123 is a snap-fit ​​mechanism. The separate splicing structure of the first splicing block 71 and the first fixing block 72 reduces manufacturing and assembly costs. The first splicing block 71 and the first fixing block 72 are securely engaged via the first snap-fit ​​block 7121, the first slot 7122, the second snap-fit ​​block 7222, the second slot 7221, the third snap-fit ​​block 203, and the third slot 7123. This ensures that the first splicing block 71 is less likely to experience axial displacement with the first fixing block 72, and that the first splicing block 71 can rotate synchronously with the first fixing block 72. Furthermore, after the first splicing block 71 and the first fixing block 72 are snap-fitted together, they form the first connecting post 21 and the second connecting post 22. During assembly, the first torsion spring 41 is sleeved on the first connecting post 21, and the second torsion spring 42 is sleeved on the second connecting post 22, ensuring a stable connection between the first splicing block 71 and the first fixing block 72, preventing them from easily separating and improving structural stability.

[0041] See Figure 2 , Figure 4 and Figure 12The rotating plug 3 is provided with a second splicing block 81 separately, and a second fixing block 82 is integrally provided on the rotating plug 3. The second splicing block 81 includes a fifth half-pillar 811 and a sixth half-pillar 812 integrally connected. The second fixing block 82 includes a seventh half-pillar 821 and an eighth half-pillar 822 integrally connected. The fifth half-pillar 811 and the seventh half-pillar 821 are spliced ​​together to form a third connecting post 31, and the sixth half-pillar 812 and the eighth half-pillar 822 are spliced ​​together to form a fourth connecting post 32. A fourth locking block 8221 is provided on the eighth half-pillar 822, and a fourth locking groove 8121 corresponding to the fourth locking block 8221 is provided on the sixth half-pillar 812. A fifth locking block 302 is provided on the side end of the rotating plug 3 near the sixth half-pillar 812, and a fifth locking groove corresponding to the fifth locking block 302 is provided on the sixth half-pillar 812. 8122; By adopting a split splicing structure of the second splicing block 81 and the second fixing block 82, the manufacturing and assembly costs are reduced. The second splicing block 81 and the second fixing block 82 are firmly engaged through the fourth locking block 8221, the fourth locking groove 8121, the fifth locking block 302, and the fifth locking groove 8122, making it difficult for the second splicing block 81 to undergo axial displacement with the second fixing block 82, and the second splicing block 81 can rotate synchronously with the second fixing block 82. In addition, after the second splicing block 81 and the second fixing block 82 are engaged and spliced, a third connecting post 31 and a fourth connecting post 32 are formed. During assembly, the first torsion spring 41 is sleeved on the third connecting post 21, and the second torsion spring 42 is sleeved on the fourth connecting post 22, so that the second splicing block 81 and the second fixing block 82 are firmly spliced ​​and not easy to detach, thus improving the stability of the structure.

[0042] See Figure 1 , Figure 4 , Figure 6 , Figure 7 and Figure 12 The spring roller blind with double torsion springs also includes an adjusting turntable 9, which is rotatably sleeved on the outside of the positioning member 6. A clamping spring 10 is sleeved on the positioning member 6. An installation groove 901 is formed between the adjusting turntable 9 and the rotating plug 3, and the support leg of the clamping spring 10 is placed in the installation groove 901. The function of pre-stressing the spring roller blind is achieved by manually rotating the adjusting turntable 9. The specific steps are as follows: Rotate the adjusting turntable 9 to drive the support leg of the clamping spring 10 and release the clamping state of the clamping spring 10. At this time, the adjusting turntable 9 drives the rotating plug 3 to rotate relative to the positioning member 6, driving the first torsion spring 41 and the second torsion spring 42 to twist and apply force. After the adjustment is completed, release the adjusting turntable 9 so that the clamping spring 10 clamps back onto the positioning member 6. At this time, the clamping spring 10 restricts the rotation of the rotating plug 3 to complete the force application step of the first torsion spring 41 and the second torsion spring 42. The function of pre-stressing by adjusting the turntable 9 is existing technology and will not be described in detail here.

[0043] The spring roller blind with double torsion springs in this invention uses a first torsion spring and a second torsion spring that are coaxially sleeved and twist in the same direction. Compared with a single torsion spring, the output torque value changes less when twisting the same number of times, reducing the overall torque value gradient. This makes the torque change during the lifting and lowering process of the roller blind smoother, achieving more precise and stable suspension of the curtain and providing a better user experience.

[0044] In addition, this utility model also provides a curtain, including the above-mentioned spring roller blind with double torsion spring. This curtain also has the same beneficial effects as the above-mentioned spring roller blind with double torsion spring, which will not be described in detail here.

[0045] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0046] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0048] In this disclosure, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature or in indirect contact with the first feature through an intermediate medium.

[0049] It should be noted that when a component is described as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is described as being "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A spring roller blind with double torsion springs, characterized in that, The device includes a spring rod (1), a rotating sleeve (2), and a rotating plug (3). The spring rod (1) is connected between the rotating sleeve (2) and the rotating plug (3). The rotating sleeve (2) and the rotating plug (3) are both rotatably sleeved on the outside of the spring rod (1). A first torsion spring (41) and a second torsion spring (42) are connected between the rotating sleeve (2) and the rotating plug (3). The diameter of the second torsion spring (42) is larger than the diameter of the first torsion spring (41). The second torsion spring (42) is sleeved on the outside of the first torsion spring (41). The direction of the torsional force of the first torsion spring (41) and the direction of the torsional force of the second torsion spring (42) are the same. In use, the rotating sleeve (2) and the rotating plug (3) rotate relative to each other so that the first torsion spring (41) and the second torsion spring (42) undergo torsional deformation at the same time so that the first torsion spring (41) and the second torsion spring (42) generate torsion in the same direction.

2. The spring roller shutter with double torsion springs according to claim 1, characterized in that, The rotating sleeve (2) is provided with a first connecting post (21) and a second connecting post (22). The diameter of the first connecting post (21) is smaller than the diameter of the second connecting post (22). The rotating plug (3) is provided with a third connecting post (31) and a fourth connecting post (32). The diameter of the third connecting post (31) is smaller than the diameter of the fourth connecting post (32). The two ends of the first torsion spring (41) are respectively sleeved on the first connecting post (21) and the third connecting post (31). The two ends of the second torsion spring (42) are respectively sleeved on the second connecting post (22) and the fourth connecting post (32).

3. The spring roller shutter with double torsion springs according to claim 2, characterized in that, The first connecting post (21) is disposed on the side end of the rotating sleeve (2) near the rotating plug (3), the second connecting post (22) is disposed on the side end of the first connecting post (21) near the rotating plug (3), the first connecting post (21) and the second connecting post (22) are coaxially arranged, the third connecting post (31) is disposed on the side end of the rotating plug (3) near the rotating sleeve (2), and the fourth connecting post (32) is disposed on the side end of the third connecting post (31) near the rotating sleeve (2), the third connecting post (31) and the fourth connecting post (32) are coaxially arranged.

4. The spring roller shutter with double torsion springs according to claim 2, characterized in that, The first connecting post (21) is provided with a first threaded groove (211) corresponding to the first torsion spring (41), and the third connecting post (31) is provided with a second threaded groove (311). One end of the first torsion spring (41) is threadedly connected to the first threaded groove (211), and the other end of the first torsion spring (41) is threadedly connected to the second threaded groove (311). One end of the first connecting post (21) is provided with a first guide slope (212) in an annular shape, and one end of the third connecting post (31) is provided with a second guide slope (312) in an annular shape. The inner side of one end of the second torsion spring (42) is tightly connected to the outer side of the second connecting post (22), and the inner side of the other end of the second torsion spring (42) is tightly connected to the outer side of the fourth connecting post (32).

5. The spring roller shutter with double torsion springs according to claim 1, characterized in that, The rotating sleeve (2) is slidably connected to the spring rod (1) along the axial direction of the spring rod (1).

6. The spring roller shutter with double torsion springs according to claim 5, characterized in that, The rotating sleeve (2) is provided with a limiting mechanism, which is used to limit the maximum position of the curtain's rise. The limiting mechanism includes a screw (51) and a limiting nut (52). The screw (51) is slidably sleeved on the spring rod (1) along the axial direction of the spring rod (1). The screw (51) rotates synchronously with the spring rod (1). The limiting nut (52) is threaded to the outside of the screw (51). The screw (51) is provided with a stop. The limiting nut (52) has a stop (511) for limiting the position. The limiting nut (52) has a protrusion (521) on its outer side. The rotating sleeve (2) has a limiting groove (201) on its inner side along its own axial direction. The protrusion (521) is slidably placed in the limiting groove (201) so that the limiting nut (52) can slide along the axial direction of the rotating sleeve (2) and the limiting nut (52) rotates synchronously with the rotating sleeve (2).

7. The spring roller shutter with double torsion springs according to claim 6, characterized in that, The screw (51) is provided with a first limiting protrusion (512), and the rotating sleeve (2) is provided with a first limiting annular groove (202) for limiting the first limiting protrusion (512) to move axially along the screw (51). The first limiting protrusion (512) is rotatably disposed in the first limiting annular groove (202) along the circumferential direction of the rotating sleeve (2). The rotating plug (3) is provided with a fixed positioning member (6) on its inner side, and a second limiting protrusion (601) is provided on the outer side of the positioning member (6). The rotating plug (3) is provided with a second limiting annular groove (301) for limiting the second limiting protrusion (601) to move axially along the screw (51). The second limiting protrusion (601) is rotatably disposed in the second limiting annular groove (301) along the circumferential direction of the rotating plug (3).

8. The spring roller shutter with double torsion springs according to claim 2, characterized in that, The rotating sleeve (2) is provided with a first splicing block (71) separately, and the rotating sleeve (2) is provided with a first fixing block (72) integrally. The first splicing block (71) includes a first half-cylinder (711) and a second half-cylinder (712) integrally connected. The first fixing block (72) includes a third half-cylinder (721) and a fourth half-cylinder (722) integrally connected. The first half-cylinder (711) is spliced ​​with the third half-cylinder (721) to form the first connecting column (21), and the second half-cylinder (712) is spliced ​​with the fourth half-cylinder (722) to form the first connecting column (21). Two connecting columns (22); the second half-column (712) is provided with a first locking block (7121) and a first locking groove (7122), the fourth half-column (722) is provided with a second locking groove (7221) corresponding to the first locking block (7121) and a second locking block (7222) corresponding to the first locking groove (7122), the rotating sleeve (2) is provided with a third locking block (203) on the side end near the first splicing block (71), and the second half-column (712) is provided with a third locking groove (7123) corresponding to the third locking block (203).

9. The spring roller shutter with double torsion springs according to claim 2, characterized in that, The rotating plug (3) is provided with a second splicing block (81) separately, and the rotating plug (3) is provided with a second fixing block (82) integrally. The second splicing block (81) includes a fifth half-cylinder (811) and a sixth half-cylinder (812) integrally connected, and the second fixing block (82) includes a seventh half-cylinder (821) and an eighth half-cylinder (822) integrally connected. The fifth half-cylinder (811) and the seventh half-cylinder (821) are spliced ​​together to form the third connecting column (31), and the sixth half-cylinder (812) and the seventh half-cylinder (822) are spliced ​​together to form the third connecting column (31). The eighth half-column (822) is spliced ​​to form the fourth connecting column (32); a fourth locking block (8221) is provided on the eighth half-column (822), and a fourth locking groove (8121) is provided on the sixth half-column (812) to be engaged with the fourth locking block (8221). A fifth locking block (302) is provided on the side end of the rotating plug (3) near the sixth half-column (812), and a fifth locking groove (8122) is provided on the sixth half-column (812) to be engaged with the fifth locking block (302).

10. A curtain, characterized in that, Including the spring roller shutter with double torsion springs as described in any one of claims 1-9.

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