Spring-type winder and curtain with double torsion springs

Abstract

We provide a spring-type winder and curtain with a double torsion spring that can securely and accurately fasten curtains, resulting in a superior user experience. [Solution] The spring-type winding device with double torsion springs comprises a spring rod 1, a rotating sleeve 2, and a rotating plug. The spring rod is connected between the rotating sleeve and the rotating plug, and both the rotating sleeve and the rotating plug are rotatably fitted to the outside of the spring rod. A first torsion spring 41 and a second torsion spring 42 are connected between the rotating sleeve and the rotating plug, with the diameter of the second torsion spring being larger than the diameter of the first torsion spring, and the second torsion spring being fitted to the outside of the first torsion spring, and the direction of the torsional force of the first torsion spring and the direction of the torsional force of the second torsion spring being the same. This invention uses a first torsion spring and a second torsion spring that are coaxially fitted and twisted in the same direction, resulting in less change in output torque at the same rotational speed and a reduced overall torque gradient compared to a single torsion spring, making the torque change during the raising and lowering process of the winding device smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of curtains, and in particular, to a spring retractor having a double torsion spring and a curtain.

Background Art

[0002] A spring retractor is an assembly commonly used in roller curtain products, and is used to realize the lifting and lowering of curtains. In commonly used spring retractors, the tension of the internal stopper spring is fixed, so it is difficult for users to adjust or change it as needed. Chinese Utility Model No. 202420955654.9 discloses a spring retractor with adjustable biasing force, the main technical means of which comprises a spring rod, a rotating disc, and a stopper spring fitted onto the spring rod, wherein a positioning member is detachably connected to one end of the spring rod, a rotating plug is rotatably connected to the outside of the positioning member, the positioning member is fixedly connected to one end of the spring rod, the positioning member is provided with a first mounting groove, one end of the spring rod is disposed in the first mounting groove, a first lock bolt for locking one end of the spring rod is screwed to the positioning member, the positioning member is provided with a first screw hole corresponding to the first lock bolt, and the positioning member and the spring rod are fixed via the first lock bolt, so that the spring rod does not need to be provided with a hole, the structural strength does not decrease, and the spring rod is not prone to breaking.

[0003] However, the above-mentioned utility models and conventional spring-type winders typically incorporate a single stopper spring (i.e., a torsion spring), and its biasing force enables the raising, lowering, and positioning of the curtain. However, this type of structure generally has a major drawback. Because the tension of the internal torsion spring is fixed at the factory, it is difficult for the user to flexibly adjust it according to the actual weight of the curtain, the environment in which it is used, or personal preference, thus limiting the versatility of the product and its ability to meet individual needs. Also, because only a single torsion spring is used, the spring wire diameter is usually designed to be relatively thick in order to obtain sufficient torque. A larger wire diameter directly increases the stiffness of the spring, and the change in force per unit rotation (i.e., the force gradient) becomes significantly larger. In actual use, this manifests as a decrease in the effective number of rotations of the spring, and a rapid change in torque output within a limited range of rotations. For example, with a thick wire spring, the torque may increase rapidly from 0N to 20N within the range of 0 to 50 rotations. Because the range of force variation (10N to 20N) corresponding to its effective operating range (e.g., 25 to 50 rotations) is too large, it becomes difficult to stop the curtain stably and accurately at any desired position during the raising and lowering process. Users have to find the balance point and make fine adjustments repeatedly, making the operation cumbersome and degrading the user experience. [Overview of the project] [Means for solving the problem]

[0004] To solve at least one of the above problems, the present invention provides a spring-type rewinder having a double torsion spring. The spring-type rewinder having a double torsion spring comprises a spring rod, a rotating sleeve, and a rotating plug, wherein the spring rod is connected between the rotating sleeve and the rotating plug, and both the rotating sleeve and the rotating plug are rotatably fitted to the outside of the spring rod, and 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 to the outside of the first torsion spring, and the direction of the torsional force of the first torsion spring and the direction of the torsional force of the second torsion spring are the same. During use, the rotating sleeve and the rotating plug are rotated relative to each other to simultaneously twist and deform the first torsion spring and the second torsion spring, so that the first torsion spring and the second torsion spring generate a torsional force in the same direction. This invention uses a first torsion spring and a second torsion spring that are coaxially fitted and twisted in the same direction. Compared to a single torsion spring, it reduces the change in output torque at the same rotational speed, lowers the overall torque gradient, makes the torque change during the raising and lowering process of the winding device smoother, and enables the curtain to be stopped with high precision and stability, resulting in a superior user experience.

[0005] Optionally, the rotating sleeve is provided with a first connecting column and a second connecting column, the diameter of which is smaller than the diameter of the second connecting column, the rotating plug is provided with a third connecting column and a fourth connecting column, the diameter of which is smaller than the diameter of the fourth connecting column, both ends of the first torsion spring are fitted to the first connecting column and the third connecting column, respectively, and both ends of the second torsion spring are fitted to the second connecting column and the fourth connecting column, respectively.

[0006] Optionally, the first connecting column is positioned at the side end of the rotating sleeve adjacent to the rotating plug, the second connecting column is positioned at the side end of the first connecting column adjacent to the rotating plug, the first and second connecting columns are arranged coaxially, the third connecting column is positioned at the side end of the rotating plug adjacent to the rotating sleeve, the fourth connecting column is positioned at the side end of the third connecting column adjacent to the rotating sleeve, and the third and fourth connecting columns are arranged coaxially.

[0007] Optionally, the first connecting column is provided with a first screw groove corresponding to the first torsion spring, the third connecting column is provided with a second screw groove, one end of the first torsion spring is screwed into the first screw groove, the other end of the first torsion spring is screwed into the second screw groove, a first guide inclined surface is provided in an annular shape at one end of the first connecting column, a second guide inclined surface is provided in an annular shape at one end of the third connecting column, the inside of one end of the second torsion spring is tightly connected to the outside of the second connecting column, and the inside of the other end of the second torsion spring is tightly connected to the outside of the fourth connecting column.

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

[0009] Optionally, the rotating sleeve is provided with a stopper mechanism, the stopper mechanism is configured to limit the upper limit position of the curtain, the stopper mechanism includes a threaded rod and a stopper nut, the threaded rod is slidably fitted onto the spring rod along the axial direction of the spring rod, the threaded rod rotates in sync with the spring rod, the stopper nut is screwed onto the outside of the threaded rod, the threaded rod is provided with a stopper portion configured to stop and restrict the position of the stopper nut, a protruding block is provided on the outside of the stopper nut, a stopper sliding groove is provided on the inside of the rotating sleeve along its axial direction, the protruding block is slidably positioned within the stopper sliding groove, thereby allowing the stopper nut to slide along the axial direction of the rotating sleeve and rotate in sync with the rotating sleeve.

[0010] Optionally, the threaded rod is provided with a first stopper bump, the rotating sleeve is provided with a first stopper ring groove configured to restrict the displacement of the first stopper bump along the axial direction of the threaded rod, the first stopper bump is rotatably positioned within the first stopper ring groove along the circumferential direction of the rotating sleeve, a fixed positioning member is provided inside the rotating plug, a second stopper bump is provided outside the positioning member, the rotating plug is provided with a second stopper ring groove configured to restrict the displacement of the second stopper bump along the axial direction of the threaded rod, and the second stopper bump is rotatably positioned within the second stopper ring groove along the circumferential direction of the rotating plug.

[0011] Optionally, the rotating sleeve may have a separate first connecting block, or a first fixed block integrally provided with the rotating sleeve, the first connecting block may include an integrally connected first half-column and a second half-column, the first fixed block may include an integrally connected third half-column and a fourth half-column, the first half-column and the third half-column may be joined to form the first connecting column, the second half-column and the fourth half-column may be joined to form the second connecting column, the second half-column may be provided with a first engagement block and a first engagement groove, the fourth half-column may be provided with a second engagement groove that engages with the first engagement block and a second engagement block that engages with the first engagement groove, the rotating sleeve may have a third engagement block at its side end adjacent to the first connecting block, and the second half-column may be provided with a third engagement groove that engages with the third engagement block.

[0012] Optionally, the rotating plug may have a separate second connecting block, or a second fixed block integrally provided with the rotating plug, the second connecting block may include a fifth and sixth semi-column integrally connected, the second fixed block may include a seventh and eighth semi-column integrally connected, the fifth and seventh semi-columns may be joined to form the third connecting column, the sixth and eighth semi-columns may be joined to form the fourth connecting column, the eighth semi-column may have a fourth engagement block, the sixth semi-column may have a fourth engagement groove that engages with the fourth engagement block, the rotating plug may have a fifth engagement block at its side end adjacent to the sixth semi-column, and the sixth semi-column may have a fifth engagement groove that engages with the fifth engagement block. [Effects of the Invention]

[0013] Compared to conventional technology, the spring-type winder with double torsion springs in this invention uses a first torsion spring and a second torsion spring that are coaxially fitted and twisted in the same direction. Compared to a single torsion spring, the output torque changes less at the same rotational speed, and the overall torque gradient is reduced. As a result, the torque changes during the raising and lowering process of the winder become smoother, allowing the curtain to be stopped with high precision and stability, resulting in a superior user experience.

[0014] Furthermore, this invention provides a curtain equipped with a spring-type winding device having the double torsion spring described above, which has the same effect as the spring-type winding device having the double torsion spring described above, and a repeated explanation will be omitted here. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view of a spring-type winding device having a double torsion spring according to the present invention. [Figure 2] This is a cross-sectional view of a spring-type winding device having a double torsion spring according to the present invention. [Figure 3] This is an enlarged view of section A in Figure 2. [Figure 4] This is an enlarged view of section B in Figure 2. [Figure 5] This is an enlarged view of section C in Figure 2. [Figure 6] This is a schematic diagram of the structure of the first torsion spring portion of a spring-type winding device having a double torsion spring according to the present invention. [Figure 7] This is an enlarged view of section D in Figure 6. [Figure 8] This is an enlarged view of section E in Figure 6. [Figure 9] This is a schematic diagram of the structure of the rotating sleeve portion of a spring-type winding device having a double torsion spring according to the present invention. [Figure 10]It is a schematic structural diagram of a stopper sliding groove of a spring-type retractor having a double torsion spring according to the present invention. [Figure 11] It is a schematic structural diagram of a stopper nut of a spring-type retractor having a double torsion spring according to the present invention. [Figure 12] It is a schematic structural diagram of a rotating plug portion of a spring-type retractor having a double torsion spring according to the present invention. [Figure 13] It is a schematic structural diagram of a second stopper ring groove of a spring-type retractor having a double torsion spring according to the present invention. DETAILED DESCRIPTION OF EMBODIMENTS

[0016] In order to make the above objects, features and advantages of the present invention clearer and easier to understand, specific embodiments of the present invention will be described in detail below with reference to the drawings.

[0017] In the description of the present invention, the orientations or positional relationships indicated by terms such as "upper" and "lower" are the orientations or positional relationships based on when the product is normally used.

[0018] In addition, terms such as "first" and "second" are used for descriptive purposes only, and shall not be understood as indicating or implying their relative importance, or implying the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

[0019] Referring to Figures 1 to 13, an embodiment of the present invention provides a spring-type retractor with double torsion springs, comprising a spring rod 1, a rotating sleeve 2 and a rotating plug 3, wherein 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 fitted outside 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 that of the first torsion spring 41, the second torsion spring 42 is fitted outside the first torsion spring 41, and the torsional force direction of the first torsion spring 41 is the same as that of the second torsion spring 42. In use, the rotating sleeve 2 and the rotating plug 3 are rotated relatively to twist and deform the first torsion spring 41 and the second torsion spring 42 simultaneously, so that the first torsion spring 41 and the second torsion spring 42 generate torsional forces 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 function of stopping the curtain. The present invention adopts the first torsion spring and the second torsion spring which are coaxially fitted and twisted in the same direction, compared with a single torsion spring, the change of output torque at the same rotation speed is smaller, the overall torque gradient is reduced, the torque change during the lifting process of the retractor is smoother, the curtain can be stopped stably with high precision, and excellent user experience is realized.

[0020] Specifically, this embodiment uses a first torsion spring 41 and a second torsion spring 42 of different diameters. The two torsion springs have different stiffnesses; the smaller diameter first spring provides basic, gentle torque, enabling fine adjustments under light loads, while the larger diameter second spring supplements with greater torque as needed. The cooperation of the two springs widens the total torque output range, resulting in more linear and smoother force changes across the entire operating range. The spring diameters mentioned above refer to the average coil diameters of the first torsion spring 41 and the second torsion spring 42. By providing two torsion springs, sufficient torque can be provided, allowing the wire diameters of the first torsion spring 41 and the second torsion spring 42 to be set much thinner than those of a single torsion spring in conventional technology. This results in less torque variation with rotational speed and a more stable torque output. Combining two torsion springs of different sizes allows for flexible adaptation to curtains of different weights and sizes, improving versatility. At the same time, distributing the total load across two springs reduces the fatigue stress on a single spring, improving the overall service life and reliability.

[0021] Referring to Figures 1 to 4, the rotating sleeve 2 is provided with a first connecting column 21 and a second connecting column 22, with the diameter of the first connecting column 21 being smaller than the diameter of the second connecting column 22. The rotating plug 3 is provided with a third connecting column 31 and a fourth connecting column 32, with the diameter of the third connecting column 31 being smaller than the diameter of the fourth connecting column 32. Both ends of the first torsion spring 41 are fitted to the first connecting column 21 and the third connecting column 31, respectively, and both ends of the second torsion spring 42 are fitted to the second connecting column 22 and the fourth connecting column 32, respectively. By providing separate mounting points for the two springs, interference such as collisions between the two torsion springs when they rotate or deform under load is reduced, ensuring operational reliability and durability.

[0022] Referring to Figures 1 to 4, the first connecting column 21 is positioned at the side end of the rotating sleeve 2 adjacent to the rotating plug 3, the second connecting column 22 is positioned at the side end of the first connecting column 21 adjacent to the rotating plug 3, the first connecting column 21 and the second connecting column 22 are arranged coaxially, the third connecting column 31 is positioned at the side end of the rotating plug 3 adjacent to the rotating sleeve 2, the fourth connecting column 32 is positioned at the side end of the third connecting column 31 adjacent to the rotating sleeve 2, the third connecting column 31 and the fourth connecting column 32 are arranged coaxially. By arranging the first connecting column 21 and the second connecting column 22 coaxially, and furthermore, the third connecting column 31 and the fourth connecting column 32 coaxially, the two springs can rotate around the same central axis when twisted, avoiding the risk of extra friction, vibration or rattle caused by non-concentricity, and allowing the two torsion springs to output torque smoothly and synchronously.

[0023] Referring to Figures 6, 7, 8, 9, and 12, the first connecting column 21 is provided with a first screw groove 211 corresponding to the first torsion spring 41, the third connecting column 31 is provided with a second screw groove 311, one end of the first torsion spring 41 is screwed into the first screw groove 211, the other end of the first torsion spring 41 is screwed into the second screw groove 311, a first guide inclined surface 212 is provided in an annular shape at one end of the first connecting column 21, and a second guide inclined surface 312 is provided in an annular shape at one end of the third connecting column 31. The inner side of one end of the second torsion spring 42 is tightly connected to the outer side of the second connecting column 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 column 32. The diameter of one end of the second torsion spring 42 is slightly smaller than the diameter of the second connecting column 22, thereby allowing one end of the second torsion spring 42 to embrace the outer side of the second connecting column 22 and rotate in sync with the second connecting column 22. The diameter of the other end of the second torsion spring 42 is slightly smaller than the fourth connecting column 32, thereby allowing the other end of the second torsion spring 42 to embrace the outer side of the fourth connecting column 32 and rotate in sync with the fourth connecting column 32. The first screw groove 211 and the second screw groove 311 are screwed into both ends of the first torsion spring 41, forming a robust mechanical interlock that provides a stable foundation for torque transmission, preventing the spring from detaching from or slipping off the connecting column even when repeatedly twisted. The first guide inclined surface 212 and the second guide inclined surface 312 can guide the end of the first torsion spring 41 so that it fits smoothly into the corresponding screw groove, making assembly easier.

[0024] Referring to Figures 2, 3, and 5, the rotating sleeve 2 is slidably connected to the spring rod 1 along its axial direction. This allows the first torsion spring 41 and the second torsion spring 42 to freely expand and contract when the curtain is raised and lowered, compensating for the length change of the torsion springs that occurs during rotation and enabling stable torque output. Specifically, in conventional technology, when a torsion spring is twisted, its diameter decreases and the number of turns increases, thus extending the total length of the spring. In conventional fixed-gap structures, this natural deformation is suppressed, resulting in excess axial stress on the spring, causing torque fluctuations and abnormal noise. In this embodiment, the axial sliding function of the rotating sleeve 2 ensures space for the spring to freely expand and contract during twisting motion, absorbing the length change. This eliminates internal stress caused by axial constraint, allowing the spring to undergo pure torsional deformation, resulting in smoother and more stable torque output and improved service life.

[0025] Referring to Figures 2, 3, and 5, a stopper mechanism is provided on the rotating sleeve 2, which is configured to limit the upper limit position of the curtain, and the stopper mechanism includes a threaded rod 51 and a stopper nut 52, the threaded rod 51 is slidably fitted onto the spring rod 1 along the axial direction of the spring rod 1 and rotates in sync with the spring rod 1, the stopper nut 52 is screwed onto the outside of the threaded rod 51, the threaded rod 51 is provided with a stopper portion 511 configured to stop and restrict the position of the stopper nut 52, a protruding block 521 is provided on the outside of the stopper nut 52, the inside of the rotating sleeve 2 is provided with a stopper sliding groove 201 along its axial direction, and the protruding block 521 is slidably positioned within the stopper sliding groove 201, thereby allowing the stopper nut 52 to slide along the axial direction of the rotating sleeve 2 and rotate in sync with the rotating sleeve 2. As the curtain rises and falls, the rotating sleeve 2 rotates, and the stopper nut 52 rotates in sync with the rotating sleeve 2 due to the engagement of the protruding block 521 with the stopper sliding groove 201. However, since the stopper nut 52 is screwed onto the fixed threaded rod 51, axial movement occurs along the threaded rod 51 at the same time as rotation. When the curtain rises, the rotating sleeve 2 rotates in the forward direction, and at this time, the stopper nut 52 is displaced toward the stopper portion 511. When the curtain moves to the upper limit position, the stopper nut 52 comes into contact with the stopper portion 511 and stops, restricting the continuous forward rotation of the stopper nut 52 and the rotating sleeve 2, and forcibly stopping the rotation of the rotating sleeve 2. This achieves positional control at the upper limit position of the curtain and makes it easier for the user to operate by setting a clear upper limit for the curtain. Furthermore, it prevents the spring's biasing force from being excessively released due to over-winding the curtain, thereby disrupting the system's balance of forces, ensuring the reliability of the lifting and stopping functions, and preventing the curtain from rolling up due to inertia exceeding the upper limit position, thus guaranteeing safe and controllable use.

[0026] Referring to Figures 3, 4, 9, 12, and 13, a first stopper bump 512 is provided on the threaded rod 51, and a first stopper ring groove 202 is provided on the rotating sleeve 2 to limit the displacement of the first stopper bump 512 along the axial direction of the threaded rod 51, and the first stopper bump 512 is rotatably positioned within the first stopper ring groove 202 along the circumferential direction of the rotating sleeve 2. A fixed positioning member 6 is fitted inside the rotating plug 3, and a second stopper bump 601 is provided on the outside of the positioning member 6, and a second stopper ring groove 301 is provided on the rotating plug 3 to limit the displacement of the second stopper bump 601 along the axial direction of the threaded rod 51, and the second stopper bump 601 is rotatably positioned within the second stopper ring groove 301 along the circumferential direction of the rotating plug 3. This structure achieves axial positioning and circumferential rotation of the main components through the fitting of the bumps and ring grooves. Specifically, the threaded rod 51 and the rotating sleeve 2, and the positioning member 6 and the rotating plug 3 are positioned relative to each other in the axial direction to prevent axial displacement during operation, thereby ensuring the effective operating length and stability of the biasing force of the internal double spring. Furthermore, bolts are not required to position the threaded rod 51 and the rotating sleeve 2, and the positioning member 6 and the rotating plug 3 in the axial direction, resulting in a more reliable structure and avoiding the loosening problems that occur when bolts are used. In this embodiment, the threaded rod 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 threaded rod 51 can be restricted in the circumferential direction of the spring rod 1 by engaging the positioning teeth 513 with the positioning grooves 101. Similarly, the positioning member 6 is also provided with positioning teeth, allowing the positioning member 6 to be restricted in the circumferential direction of the spring rod 1.

[0027] Referring to Figures 2, 3, and 9, the rotating sleeve 2 is provided with a separate first joining block 71 and an integrally provided first fixing block 72. The first joining block 71 includes an integrally connected first semi-column 711 and a second semi-column 712, and the first fixing block 72 includes an integrally connected third semi-column 721 and a fourth semi-column 722. The first semi-column 711 and the third semi-column 721 are joined to form a first connecting column 21, and the second semi-column 712 and the fourth semi-column 722 are joined to form a second connecting column 22. The second semi-column 712 is provided with a first engaging block 7121 and a first engaging groove 7122, and the fourth semi-column 722 is provided with a second engaging groove 7221 that engages with the first engaging block 7121 and a second engaging block 7222 that engages with the first engaging groove 7122. The rotating sleeve 2 is provided with a third engagement block 203 at its side end adjacent to the first joining block 71, and a third engagement groove 7123 is provided in the second semi-column 712 that engages with the third engagement block 203. The separate joining structure of the first joining block 71 and the first fixed block 72 reduces manufacturing and assembly costs. Furthermore, by firmly engaging the first joining block 71 and the first fixed block 72 via the first engagement block 7121, the first engagement groove 7122, the second engagement block 7222, the second engagement groove 7221, the third engagement block 203, and the third engagement groove 7123, the first joining block 71 can rotate synchronously with the first fixed block 72 without easily being displaced axially from the first fixed block 72. Furthermore, after the first connecting block 71 and the first fixing block 72 are engaged and joined, they form the first connecting column 21 and the second connecting column 22. During assembly, the first torsion spring 41 is fitted into the first connecting column 21 and the second torsion spring 42 is fitted into the second connecting column 22, thereby firmly joining the first connecting block 71 and the first fixing block 72, preventing them from easily coming apart and improving the stability of the structure.

[0028] Referring to Figures 2, 4, and 12, the rotating plug 3 has a second connecting block 81 provided separately and a second fixing block 82 provided integrally. The second connecting block 81 includes a fifth semi-column 811 and a sixth semi-column 812 which are integrally connected, and the second fixing block 82 includes a seventh semi-column 821 and an eighth semi-column 822 which are integrally connected. The fifth semi-column 811 and the seventh semi-column 821 are joined to form a third connecting column 31, and the sixth semi-column 812 and the eighth semi-column 822 are joined to form a fourth connecting column 32. The eighth semi-column 822 is provided with a fourth engaging block 8221, and the sixth semi-column 812 is provided with a fourth engaging groove 8121 which engages with the fourth engaging block 8221. The rotating plug 3 is provided with a fifth engagement block 302 at its side end adjacent to the sixth semi-column 812, and a fifth engagement groove 8122 is provided on the sixth semi-column 812 that engages with the fifth engagement block 302. The separate joining structure of the second connecting block 81 and the second fixed block 82 reduces manufacturing and assembly costs. Furthermore, by firmly engaging the second connecting block 81 and the second fixed block 82 via the fourth engagement block 8221, the fourth engagement groove 8121, the fifth engagement block 302, and the fifth engagement groove 8122, the second connecting block 81 can rotate synchronously with the second fixed block 82 without easily being displaced axially from the second fixed block 82. Furthermore, after the second connecting block 81 and the second fixing block 82 are engaged and joined, they form the third connecting column 31 and the fourth connecting column 32. During assembly, the first torsion spring 41 is fitted into the third connecting column 31 and the second torsion spring 42 is fitted into the fourth connecting column 32, thereby firmly joining the second connecting block 81 and the second fixing block 82, preventing them from easily coming apart and improving the stability of the structure.

[0029] Referring to Figures 1, 4, 6, 7, and 12, the spring-type winder having a double torsion spring further includes an adjustment turntable 9, which is rotatably fitted to the outside of the positioning member 6, a tightening spring 10 is fitted to the positioning member 6, a mounting groove 901 is formed between the adjustment turntable 9 and the rotating plug 3, and the support legs of the tightening spring 10 are positioned within the mounting groove 901. The function of biasing the spring-type winder is achieved by manually rotating the adjustment turntable 9, and the specific procedure is as follows: Rotate the adjustment turntable 9 to drive the support legs of the tightening spring 10 and release the clamped state of the tightening spring 10. At this time, the adjustment turntable 9 rotates the rotary plug 3 relative to the positioning member 6, driving the torsional force of the first torsion spring 41 and the second torsion spring 42. Once the adjustment is complete, the adjustment turntable 9 is released, allowing the tightening spring 10 to grip the positioning member 6 again. At this time, the tightening spring 10 restricts the rotation of the rotary plug 3, completing the biasing of the first torsion spring 41 and the second torsion spring 42. Since the biasing function achieved by the adjustment turntable 9 is based on prior art, a detailed explanation is omitted here.

[0030] The spring-type winder with double torsion springs in this invention uses a first torsion spring and a second torsion spring that are coaxially fitted and twisted in the same direction. Compared to a single torsion spring, it results in less variation in output torque at the same rotational speed, a reduced overall torque gradient, smoother torque changes during the raising and lowering process of the winder, and allows the curtain to be stopped with high precision and stability, providing an excellent user experience.

[0031] Furthermore, the present invention provides a curtain equipped with a spring-type winder having the double torsion spring described above, which has the same beneficial effects as the spring-type winder having the double torsion spring described above, and a repeated explanation will be omitted here.

[0032] In this disclosure, orientations or positional relationships indicated by terms such as “up,” “down,” “bottom,” “inside,” “outside,” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely to facilitate and simplify the description of this disclosure and do not indicate or suggest that the devices or components shown have a particular orientation or must be configured and operate in a particular orientation. Therefore, it should not be understood as limiting this disclosure.

[0033] Furthermore, terms such as “first,” “second,” etc., are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly specifying the number of technical features to be shown. Accordingly, features limited as “first,” “second,” etc., may explicitly or implicitly include at least one of these features. In the description of this disclosure, “multiple” means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0034] In this disclosure, unless otherwise explicitly stated or limited, terms such as “attachment” and “connection” should be understood in a broad sense. For example, “connection” may be a fixed connection, a detachable connection or an integral connection, a mechanical connection or an electrical connection, a direct connection or an indirect connection via an intermediate medium, an internal communication between two elements or an interaction relationship between two elements, and a person skilled in the art will be able to understand the specific meaning of the above terms in this disclosure depending on the specific circumstances.

[0035] In this disclosure, unless otherwise explicitly stated or limited, the phrase "above" or "below" the second feature means that the first and second features may be in direct contact, or they may be indirectly in contact through an intermediate medium.

[0036] When a part is described as being "placed" on another part, it may be placed directly on the other part, or an intermediate part may be present. When a part is described as being "connected to another part," it may be connected directly to the other part, or an intermediate part may be present. Furthermore, when a part is described as being "fixedly connected" to another part, the connection may be fixed by a detachable connection such as fitting, engagement, integral molding, or welding, or by a non-detachable connection, all of which are achievable in the prior art, and a detailed explanation is omitted here.

[0037] The technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as these combinations of technical features are inconsistent, they should all be considered to fall within the scope described herein. [Explanation of Symbols]

[0038] 1. Spring rod, 101 Positioning groove, 2-rotation sleeve, 201 Stopper sliding groove, 202 First stopper ring groove, 203 Third engagement block, 21 1st connecting column, 211 First screw groove, 212 First guide inclined surface, 22 2nd connecting column, 3-turn plug, 31 Third connecting column, 311 Second screw groove, 312 Second guide inclined surface, 32 4th connecting pillar, 301 Second stopper ring groove, 302 Fifth engagement block, 41. First torsion spring, 42. Second torsion spring, 51 threaded rod, 511 Stopper section, 512 First stopper bump, 513 Positioning teeth, 52 Stopper nut, 521 Protruding block, 6 Positioning member, 601 Second stopper bump, 71 First joint block, 711 First semi-column, 712 Second semi-column, 7121 First engagement block, 7122 First engagement groove, 7123 Third engagement groove, 72 First fixed block, 721 Third semi-column, 722 Fourth semi-column, 7221 Second engagement groove, 7222 Second engagement block, 81 Second joint block, 811 Fifth semi-column, 812 6th semi-column, 8121 Fourth engagement groove, 8122 Fifth engagement groove, 82 Second fixed block, 821 7th semi-column, 822 8th semi-column, 8221 Fourth engagement block, 8222 Fifth engagement groove, 9. Adjustment turntable, 901 Mounting groove, 10. Tightening spring.

Claims

1. A spring-type winding device having a double torsion spring, comprising a spring rod (1), a rotating sleeve (2), and a rotating plug (3), wherein 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 fitted to 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 fitted to the outside of the first torsion spring (41), and 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. A spring-type winding device having a double torsion spring, characterized in that when in use, the rotating sleeve (2) and the rotating plug (3) are rotated relative to each other, thereby simultaneously twisting and deforming the first torsion spring (41) and the second torsion spring (42), so that the first torsion spring (41) and the second torsion spring (42) generate a torsional force in the same direction.

2. The rotating sleeve (2) is provided with a first connecting column (21) and a second connecting column (22), the diameter of the first connecting column (21) being smaller than the diameter of the second connecting column (22), the rotating plug (3) is provided with a third connecting column (31) and a fourth connecting column (32), the diameter of the third connecting column (31) being smaller than the diameter of the fourth connecting column (32), both ends of the first torsion spring (41) being fitted to the first connecting column (21) and the third connecting column (31), respectively, and both ends of the second torsion spring (42) being fitted to the second connecting column (22) and the fourth connecting column (32), respectively, as described in claim 1, a spring-type winding device having a double torsion spring.

3. The spring-type winding device having a double torsion spring according to claim 2, characterized in that the first connecting column (21) is positioned at the side end of the rotating sleeve (2) adjacent to the rotating plug (3), the second connecting column (22) is positioned at the side end of the first connecting column (21) adjacent to the rotating plug (3), the first connecting column (21) and the second connecting column (22) are arranged coaxially, the third connecting column (31) is positioned at the side end of the rotating plug (3) adjacent to the rotating sleeve (2), the fourth connecting column (32) is positioned at the side end of the third connecting column (31) adjacent to the rotating sleeve (2), and the third connecting column (31) and the fourth connecting column (32) are arranged coaxially.

4. The spring-type winding device having a double torsion spring according to claim 2, characterized in that the first connecting column (21) is provided with a first screw groove (211) corresponding to the first torsion spring (41), the third connecting column (31) is provided with a second screw groove (311), one end of the first torsion spring (41) is screwed into the first screw groove (211), the other end of the first torsion spring (41) is screwed into the second screw groove (311), a first guide inclined surface (212) is provided in an annular shape at one end of the first connecting column (21), a second guide inclined surface (312) is provided in an annular shape at one end of the third connecting column (31), the inside of one end of the second torsion spring (42) is tightly connected to the outside of the second connecting column (22), and the inside of the other end of the second torsion spring (42) is tightly connected to the outside of the fourth connecting column (32).

5. The spring-type winding device having a double torsion spring 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. A stopper mechanism is provided in the rotating sleeve (2), and the stopper mechanism is configured to limit the upper limit position of the curtain, and the stopper mechanism includes a threaded rod (51) and a stopper nut (52), the threaded rod (51) is slidably fitted into the spring rod (1) along the axial direction of the spring rod (1), the threaded rod (51) rotates in synchronous motion with the spring rod (1), the stopper nut (52) is screwed onto the outside of the threaded rod (51), and the threaded rod (51) is configured to stop the stopper nut (52) and restrict its position A spring-type winding device having a double torsion spring, as described in claim 5, characterized in that a stopper portion (511) is provided, a protruding block (521) is provided on the outside of the stopper nut (52), a stopper sliding groove (201) is provided on the inside of the rotating sleeve (2) along its axial direction, and the protruding block (521) is slidably arranged within the stopper sliding groove (201), thereby allowing the stopper nut (52) to slide along the axial direction of the rotating sleeve (2) and to rotate in synchronously with the rotating sleeve (2).

7. A first stopper bump (512) is provided on the threaded rod (51), and a first stopper ring groove (202) is provided on the rotating sleeve (2) which is configured to restrict the displacement of the first stopper bump (512) along the axial direction of the threaded rod (51), the first stopper bump (512) is rotatably arranged within the first stopper ring groove (202) along the circumferential direction of the rotating sleeve (2), and a positioning member (6) is fixedly provided inside the rotating plug (3), and the positioning part A spring-type winding device having a double torsion spring according to claim 6, characterized in that a second stopper bump (601) is provided on the outside of the material (6), a second stopper ring groove (301) is provided in the rotating plug (3) which is configured to restrict the displacement of the second stopper bump (601) along the axial direction of the threaded rod (51), and the second stopper bump (601) is rotatably arranged within the second stopper ring groove (301) along the circumferential direction of the rotating plug (3).

8. A first connecting block (71) is provided separately on the rotating sleeve (2), and a first fixing block (72) is integrally provided on the rotating sleeve (2). The first connecting block (71) includes a first semi-column (711) and a second semi-column (712) that are integrally connected, and the first fixing block (72) includes a third semi-column (721) and a fourth semi-column (722) that are integrally connected. The first semi-column (711) and the third semi-column (721) are joined to form the first connecting column (21), and the second semi-column (712) and the fourth semi-column (722) are joined to form the second connecting column (22). The second semi-column (712) has a first engaging block. A spring-type winding device having a double torsion spring, as described in claim 2, characterized in that a lock (7121) and a first engagement groove (7122) are provided, the fourth semi-column (722) is provided with a second engagement groove (7221) that engages with the first engagement block (7121), and a second engagement block (7222) that engages with the first engagement groove (7122), the rotating sleeve (2) is provided with a third engagement block (203) at the side end adjacent to the first joining block (71), and the second semi-column (712) is provided with a third engagement groove (7123) that engages with the third engagement block (203).

9. A second connecting block (81) is provided separately on the rotating plug (3), and a second fixing block (82) is integrally provided on the rotating plug (3). The second connecting block (81) includes a fifth semi-column (811) and a sixth semi-column (812) that are integrally connected, and the second fixing block (82) includes a seventh semi-column (821) and an eighth semi-column (822) that are integrally connected. The fifth semi-column (811) and the seventh semi-column (821) are joined to form the third connecting column (31), and the sixth semi-column (812) and the eighth semi-column (822) are joined to form the fourth connecting column. A spring-type winding device having a double torsion spring, characterized in that (32) is formed, a fourth engagement block (8221) is provided on the eighth semi-column (822), a fourth engagement groove (8121) is provided on the sixth semi-column (812) that engages with the fourth engagement block (8221), a fifth engagement block (302) is provided on the side end of the rotating plug (3) adjacent to the sixth semi-column (812), and a fifth engagement groove (8122) is provided on the sixth semi-column (812) that engages with the fifth engagement block (302).

10. A curtain characterized by comprising a spring-type winding device having a double torsion spring as described in any one of claims 1 to 9.

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