A constant force spring pull-free curtain system

Abstract

The present invention provides a constant-force spring pull-free curtain system, comprising a curtain body and an upper roll-up tube connected to the upper end of the curtain body, wherein one end of the upper roll-up tube is connected to the left bracket via a resistance mechanism, and the other end is connected to the right bracket via a constant-force spring power system, wherein the constant-force spring power system comprises a constant-force spring mechanism provided with a constant-force spring and a power fine-tuning mechanism for adjusting the elastic force of the constant-force spring, wherein the constant-force spring mechanism is arranged inside the upper roll-up tube, and the power fine-tuning mechanism connected to the constant-force spring mechanism is connected to the right bracket. A power transmission mechanism is arranged between the power fine-tuning mechanism and the constant-force spring mechanism, so that the axis of the rotating wheel and the axis of the spring sleeve are respectively arranged on both sides of the axis of the upper roll-up tube. The present invention reduces the overall width of the pull-free curtain system. It effectively reduces the required diameter of the upper roll-up tube, thereby meeting the needs of small-diameter curtains.

Description

Technical Field

[0001] The invention belongs to the field of curtains, and in particular relates to a constant-force spring pull-free curtain system. Background Art

[0002] With the development and progress of society, curtain products are constantly being updated. Curtain products operated by beads or pull cords can pose a safety hazard to children. Therefore, cordless curtain products have gradually become the main product demanded and chosen by customers. However, due to the higher cost of electric curtain products, cordless spring curtain products are more suitable for the market.

[0003] The cordless rainbow curtains and cordless roller curtains currently produced and sold on the market are difficult to achieve balance during the debugging process, and the built-in balancing force adjustment device is prone to failure after being permanently installed. After a period of use, they are more likely to fall when tightened or rebound after being pulled down to a high height; the debugging configuration takes up a large space, resulting in a large difference between the cloth width and the window frame width during installation and use, which is not aesthetically pleasing to install. In addition, the debugging device is on the side of the curtain, and must be removed after the curtain is installed in the window frame before debugging. Summary of the Invention

[0004] The invention provides a constant-force spring pull-free curtain system.

[0005] The objective of the present invention is achieved in the following manner: a constant force spring pull-free curtain system, comprising a curtain body and an upper roll-up tube connected to the upper end of the curtain body, one end of the upper roll-up tube being connected to the left bracket through a resistance mechanism, and the other end being connected to the right bracket through a constant force spring power system, the constant force spring power system comprising a constant force spring mechanism provided with a constant force spring and a power fine-tuning mechanism for adjusting the elastic force of the constant force spring, the constant force spring mechanism being arranged inside the upper roll-up tube, and the power fine-tuning mechanism connected to the constant force spring mechanism being connected to the right bracket.

[0006] The constant force spring mechanism includes a constant force spring housing, a rotating wheel and a spring sleeve arranged side by side in the constant force spring housing; the constant force spring is rotatably sleeved on the spring sleeve and one end of the constant force spring is fixed to the rotating wheel; the rotating wheel is rotatably arranged on the constant force spring housing; when the curtain is opened or closed, the upper winding tube rotates to drive the constant force spring to be wound on the rotating wheel; when the power is fine-tuned, the upper winding tube does not rotate, and the power fine-tuning mechanism drives the rotating wheel to rotate.

[0007] A power transmission mechanism is arranged between the power fine-tuning mechanism and the constant force spring mechanism, and the power transmission mechanism includes a power input shaft and a power output shaft which transmit power through a gear mechanism and are staggered; the power output shaft is concentric with the rotating wheel and is fixedly connected; the axis of the rotating wheel and the axis of the spring sleeve are respectively arranged on both sides of the axis of the upper winding tube; the torsion core of the power fine-tuning mechanism is fixed to the power input shaft and transmits fine-tuning power; the torsion core and the power input shaft are coaxial with the upper winding tube.

[0008] The power transmission mechanism includes a power transmission shell with a cavity arranged inside, and the power input shaft and the power output shaft are rotatably arranged in the power transmission shell respectively, an input gear is fixedly arranged on the power input shaft, and an output gear is fixedly arranged on the power output shaft; an intermediate gear is also rotatably arranged in the power transmission shell, and the input gear and the output gear are respectively engaged with the intermediate gear; the power input shaft and the power output shaft respectively pass through two opposite surfaces of the power transmission shell.

[0009] The constant force spring housing is stuck in the upper winding tube and rotates with the upper winding tube; the power fine-tuning mechanism includes a braking sleeve, an adjusting wheel, a braking inner rod, a bidirectional torsion spring and the torsion core fixed and concentric with the upper winding tube, wherein the adjusting wheel includes a wheel disk with an inner hole and an adjusting wheel fan ring arranged concentrically with the wheel disk; one end of the torsion core is provided with a connecting end connected to the power input shaft, and the other end is provided with a torsion core fan ring; the braking inner rod is fixedly connected to the right bracket; the adjusting wheel is sleeved on the braking inner rod, and at least one bidirectional torsion spring is sleeved on the braking inner rod, the torsion core fan ring and the adjusting wheel fan ring are respectively sleeved on the outside of the braking inner rod and have a gap with the outer surface of the braking inner rod, the two side surfaces of the torsion core fan ring and the two side surfaces of the adjusting wheel fan ring respectively constitute two gap spaces, and the two columns of each bidirectional torsion spring are respectively arranged in the two gap spaces; the braking sleeve is fixed in the upper winding tube, and the braking sleeve is sleeved on the outer surfaces of the torsion core fan ring and the adjusting wheel fan ring.

[0010] A first limiting ring is provided on the outer surface of the connecting end of the torsion core, and the limiting ring of the torsion core and the disc of the adjusting wheel respectively limit the left and right sides of the control sleeve; a connecting hole is provided in the connecting end of the torsion core, and a second limiting ring is provided in the connecting hole near the left end of the control inner rod, and a threaded hole is provided at the left end of the control inner rod, and a screw with a gasket is provided in the connecting hole on the left side of the second limiting ring, and the screw with a gasket cooperates with the threaded hole to connect the control inner rod and the torsion core, and the connecting end of the torsion core is rotatably provided on the outer surface of the control inner rod; an inner rod limiting disk is provided at the right end of the control inner rod, and the inner rod limiting disk is clamped at the right end of the disc; the connecting hole is fixedly connected to the intermediate connecting piece, and one end of the power input shaft is fixedly provided in the inner hole of the intermediate connecting piece.

[0011] At least one constant force spring mechanism is arranged in the upper winding tube, and adjacent constant force spring mechanisms are arranged in series; the constant force spring mechanism includes a constant force spring housing and a rotating wheel and a spring sleeve arranged side by side in the constant force spring housing; the constant force spring is rotatably sleeved on the spring sleeve and one end of the constant force spring is fixed to the rotating wheel; a rotating wheel shaft extending out of the constant force spring housing is provided at one end of the rotating wheel, and an inner hole is provided at the other end of the rotating wheel; different constant force spring mechanisms are connected in series through the cooperation of the rotating wheel shaft and the inner hole of the rotating wheel.

[0012] The resistance mechanism includes a tail-control inner rod fixedly connected to the left bracket at its left end, a tail-control inner core sleeved on the tail-control inner rod, a tail-control sleeve sleeved on the tail-control inner core, a first one-way torsion spring, a second one-way torsion spring and a buckle cover; the first one-way torsion spring is arranged between the tail-control inner rod and the tail-control inner core, and the second one-way torsion spring is arranged between the tail-control inner core and the tail-control sleeve; the buckle cover covers the right end surface of the tail-control sleeve and is fixed to the right end of the tail-control inner rod by a screw; when the curtain is pulled down, the resistance generated by pushing the first one-way torsion spring clockwise is greater than the force generated by pushing the second one-way torsion spring counterclockwise when the curtain is rolled back.

[0013] The constant force spring housing is stuck in the upper roll-up tube; the axis of the rotating wheel is coaxial with the axis of the upper roll-up tube, and the rotating wheel is fixed to the output shaft of the power fine-tuning mechanism; when the curtain is opened or closed, the constant force spring housing rotates along with the upper roll-up tube, and the rotating wheel and the output shaft of the power fine-tuning mechanism do not rotate; the constant force spring revolves and rotates along with the constant force spring housing, thereby winding back onto the rotating wheel; during power fine-tuning: the output shaft of the power fine-tuning mechanism rotates to drive the rotating wheel to rotate.

[0014] Compared with the prior art, the present invention adjusts the order of the constant force spring mechanism and the power fine-tuning mechanism, and arranges the constant force spring mechanism in the upper roll-up tube, thereby reducing the overall width of the pull-free curtain system.

[0015] The present invention provides a power transmission mechanism that staggers the axis of the rotor and the axis of the spring sleeve to either side of the axis of the upper roll-up tube. This allows for a more rational arrangement of the constant-force spring mechanism within the upper roll-up tube, effectively reducing the required diameter of the upper roll-up tube and thus accommodating the needs of small-diameter curtains.

[0016] The power transmission mechanism uses an intermediate gear to transmit power, which can effectively adjust the center distance between the power input gear shaft and the power output gear shaft, expanding the range of variation of the center distance, thereby adapting to the needs of different sizes of winding tubes, especially small sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded view of a no-pull curtain system.

[0018] Figure 2 It is a schematic diagram of the constant force spring power system.

[0019] Figure 3 yes Figure 2 exploded view.

[0020] Figure 4 Schematic diagram of the overall resistance mechanism.

[0021] Figure 5 yes Figure 4 Explosion diagram.

[0022] Figure 6 It is a schematic diagram of the resistance mechanism installation process.

[0023] Figure 7 This is an exploded diagram of the power fine-tuning mechanism.

[0024] Figure 8 It is a cross-sectional view of the power fine-tuning mechanism.

[0025] Figure 9 This is a diagram of the installation process of the power fine-tuning mechanism.

[0026] Figure 10 It is an exploded diagram of the power transmission mechanism.

[0027] Figure 11 yes Figure 10 Installation process diagram.

[0028] Figure 12 This is an exploded view of the constant force spring mechanism.

[0029] Figure 13 This is a diagram of the installation steps of the constant force spring mechanism.

[0030] Figure 14 This is a schematic diagram of the installation of the constant force spring power system.

[0031] Among them, 1 is the resistance mechanism, 10 is the tail control inner rod, 11 is the tail control inner core, 12 is the tail control sleeve, 13 is the first one-way torsion spring, 14 is the second one-way torsion spring, 15 is the buckle cover, 2 is the constant force spring mechanism, 20 is the rotating wheel, 21 is the spring sleeve, 22 is the constant force spring, 23 is the rotating wheel shaft, 24 is the spring front housing, 25 is the spring rear housing, 26 is the pressing plate, 3 is the power transmission mechanism, 30 is the support plate, 31 is the power transmission front housing, 32 is the power transmission rear housing, 3 3 is the power input shaft, 34 is the power output shaft, 35 is the intermediate gear, 4 is the intermediate connecting piece, 5 is the curtain body, 6 is the power fine-tuning mechanism, 60 is the head sleeve, 61 is the torsion core, 610 is the first limiting ring, 611 is the second limiting ring, 612 is the connecting hole, 62 is the two-way torsion spring, 63 is the adjusting wheel, 630 is the adjusting wheel fan ring, 64 is the screw with gasket, 65 is the head inner rod, 7 is the left bracket, 8 is the right bracket, 9 is the upper winding tube, 90 is the lower beam, and 91 is the cover. DETAILED DESCRIPTION

[0032] In this application, unless otherwise specified or limited, the technical terms used herein shall have the ordinary meanings understood by persons skilled in the art. Terms such as "connected," "attached," "fixed," and "disposed" should be interpreted broadly and may refer to fixed, removable, or integral connections; direct or indirect connections through an intermediary; and mechanical or electrical connections. Unless otherwise specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact or indirect contact through an intermediary. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Relational terms such as first and second are used solely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms used in the description, such as "center", "transverse", "longitudinal", "length", "width", "thickness", "height", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc., to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0033] The following will provide a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings and specific embodiments. Figure 1-14 As shown, a constant force spring pull-free curtain system includes a curtain body 5 and an upper roll-up tube 9 connected to the upper end of the curtain body 5, one end of the upper roll-up tube 9 is connected to the left bracket 7 through a resistance mechanism 1, and the other end is connected to the right bracket 8 through a constant force spring power system, the constant force spring power system includes a constant force spring mechanism 2 provided with a constant force spring 22 and a power fine-tuning mechanism 6 for adjusting the elastic force of the constant force spring 22, the constant force spring mechanism 2 is arranged inside the upper roll-up tube 9, and the power fine-tuning mechanism 6 connected to the constant force spring mechanism 2 is connected to the right bracket 8. Here, the left bracket 7 and the right bracket 8 and the subsequent left and right positions are relative positions, not fixed left and right. In the existing curtain system using a constant force spring 22 as a power source, such as the constant force spring pull-free curtain system of patent CN213573819 U, the constant force spring mechanism 2 is arranged outside the upper roll-up tube 9 and connected to the right bracket 8. The upper structure of the pull-free curtain is relatively large. In the present invention, the order of the constant force spring mechanism 2 and the power fine-tuning mechanism 6 is adjusted, and the constant force spring mechanism 2 is arranged in the upper roll-up tube 9, thereby reducing the overall width of the non-pull curtain system.

[0034] The constant-force spring mechanism 2 includes a constant-force spring housing, a rotating wheel 20, and a spring sleeve 21 arranged side by side within the constant-force spring housing; a constant-force spring 22 is rotatably mounted on the spring sleeve 21, and one end of the constant-force spring 22 is fixed to the rotating wheel 20. The rotating wheel 20 is rotatably mounted on the constant-force spring housing; when the curtain is opened or closed, the upper roll-up tube 9 rotates, driving the constant-force spring 22 to wind around the rotating wheel 20; during power fine-tuning, the upper roll-up tube 9 does not rotate, and the power fine-tuning mechanism drives the rotating wheel 20 to rotate. The structures of the constant-force spring mechanism 2 and the power fine-tuning mechanism 6 can have various forms. In principle, when the curtain is opened or closed, that is, when the upper roll-up tube rotates clockwise or counterclockwise, the constant-force spring 22 is wound around the rotating wheel. This can be done by the rotating wheel 20 rotating, driving the constant-force spring 22 to wind around itself; or the constant-force spring 22 can be wound around the rotating wheel 20 as the constant-force spring housing revolves.

[0035] Furthermore, a power transmission mechanism 3 is provided between the power fine-tuning mechanism 6 and the constant-force spring mechanism 2. This power transmission mechanism 3 includes a power input shaft 33 and a power output shaft 34, which are staggered and transmit power via a gear mechanism. The power output shaft 34 is concentrically and fixedly connected to the rotating wheel 20. The axis of the rotating wheel 20 and the axis of the spring sleeve 21 are respectively arranged on either side of the axis of the upper reel 9. The torsion core 61 of the power fine-tuning mechanism 6 is fixed to the power input shaft 33 and transmits fine-tuning power. The torsion core 61 and the power input shaft 33 are coaxial with the upper reel 9. Without the power transmission mechanism 3, the power fine-tuning mechanism 6 is directly connected to the rotating wheel 20, with the axis of the rotating wheel and the axis of the upper reel 9 collinear, and the axis of the spring sleeve 21 and the axis of the rotating wheel being arranged on the same side of the axis of the upper reel 9. The constant-force spring mechanism 2 is placed within the upper reel, requiring a relatively large radius for the upper reel, which cannot accommodate small curtain diameters. The present invention incorporates a power transmission mechanism 3, which, through staggered placement, positions the axis of the rotating wheel and the axis of the spring sleeve 21 on either side of the axis of the upper winding tube 9. The constant-force spring mechanism 2 is more rationally arranged within the upper winding tube 9, effectively reducing the required diameter of the upper winding tube 9 to accommodate small-diameter curtains. A power fine-tuning mechanism 6 ensures that the control sleeve 60 and the power input shaft 33 rotate synchronously during curtain opening and closing. When the control sleeve 60 is stationary, adjusting the power fine-tuning mechanism 6 rotates the power input shaft 33, thereby adjusting the rotating wheel 20 and adjusting the elasticity of the constant-force spring 22. Limiting plates are provided at both ends of the rotating wheel 20 in the constant-force spring mechanism 2 to limit the movement of the constant-force spring 22. These plates also serve to limit the constant-force spring 22 on the spring sleeve 21. The constant-force spring housing comprises a front spring housing 24 and a rear spring housing 25, connected by countersunk screws. Other features of the constant-force spring mechanism 2 are conventional, such as a pressure plate 26 within the rotating wheel 20 to secure one end of the constant-force spring 22. No further detailed description is given.

[0036] In one specific embodiment, the power transmission mechanism 3 includes a power transmission housing with a cavity disposed therein. A power input shaft 33 and a power output shaft 34 are rotatably mounted within the power transmission housing. An input gear is fixedly mounted on the power input shaft 33, and an output gear is fixedly mounted on the power output shaft 34. An intermediate gear 35 is also rotatably mounted within the power transmission housing, with the input gear and the output gear respectively meshing with the intermediate gear 35. The power input shaft 33 and the power output shaft 34 extend through two opposing surfaces of the power transmission housing. In a more specific configuration, the power transmission housing may include a front power transmission housing 31 and a rear power transmission housing 32 secured by a fastening mechanism. A support plate 30 is fixedly mounted in the middle of the cavity formed by the front and rear power transmission housings 31 and 32. Both the power input shaft 33 and the power output shaft 34 are rotatably mounted on the support plate 30 and disposed in opposite directions. The input gear and the output gear are also located on different sides of the support plate 30. The intermediate gear 35 is disposed in the space above the support plate 30, with both ends of the intermediate gear 35 rotatably mounted on the power transmission housing. One end of the intermediate gear 35 meshes with the input gear, and the other end meshes with the output gear. Using the intermediate gear 35 to transmit power effectively adjusts the center distance between the power input gear shaft and the power output gear shaft, expanding the range of center distance variation to accommodate various sizes of take-up tubes 9, particularly small sizes.

[0037] The installation process of the power transmission mechanism 3 is as follows: Take the power input shaft 33 and insert it through the central circular hole of the power transmission rear housing 32, then snap it into the support plate 30. The power output shaft 34 is installed on the other side of the support plate 30. The ends of the shaft where the intermediate gear 35 is located are installed into the corresponding holes in the power transmission rear housing 32 and the power transmission front housing 31 respectively. The power transmission front housing 31 is installed along the power output shaft 34 and then secured with round head screws. The power transmission part realizes the power transfer from the center position to the side position, and vice versa, connecting the power of the power fine-tuning mechanism 6 with the constant force spring mechanism 2.

[0038] Furthermore, the constant force spring shell is stuck in the upper winding tube and rotates with the upper winding tube; the power fine-tuning mechanism 6 includes a head sleeve 60 fixed and concentric with the upper winding tube 9, an adjusting wheel 63, a head inner rod 65, a bidirectional torsion spring 62 and the torsion core 61, wherein the adjusting wheel 63 includes a wheel disc with an inner hole and an adjusting wheel fan ring 630 arranged concentrically with the wheel disc; one end of the torsion core 61 is provided with a connecting end connected to the power input shaft 33, and the other end is provided with a torsion core 61 fan ring; the head inner rod 65 is fixedly connected to the right bracket 8; the adjusting wheel 63 is sleeved on the head inner rod 65, at least one bidirectional torsion spring 62 is sleeved on the inner rod 65 of the control head. The torsion core 61 sector ring and the adjusting wheel sector ring 630 are respectively sleeved on the outside of the inner rod 65, with a gap between them and the outer surface of the control head inner rod 65. The two side surfaces of the torsion core 61 sector ring and the two side surfaces of the adjusting wheel sector ring 630 respectively form two gaps, and the two uprights of each bidirectional torsion spring 62 are respectively set in the two gaps. The control head sleeve 60 is fixed in the upper winding tube 9 and sleeved on the upper surfaces of the torsion core 61 sector ring and the adjusting wheel sector ring 630. The wheel is provided with teeth to facilitate adjustment.

[0039] A first limiting ring 610 is provided on the outer surface of the connecting end of the torsion core 61, and the limiting ring of the torsion core 61 and the wheel disc of the adjusting wheel 63 respectively limit the left and right sides of the control sleeve 60; a connecting hole 612 is provided in the connecting end of the torsion core 61, and a second limiting ring 611 is provided in the connecting hole 612 near the left end of the control inner rod 65, and a threaded hole is provided at the left end of the control inner rod, and a screw 64 with a gasket is provided in the connecting hole 612 on the left side of the second limiting ring 611, and the screw 64 with a gasket cooperates with the threaded hole to connect the control inner rod 65 and the torsion core 61, and the connecting end of the torsion core 61 is rotatably provided on the outer surface of the control inner rod 65; an inner rod limiting disk is provided at the right end of the control inner rod 65, and the inner rod limiting disk is clamped at the right end of the wheel disc.

[0040] The connecting hole 612 is fixedly connected to the intermediate connecting member 4, and the end of the power input shaft 33 extending from the rear housing 32 after power transmission is fixedly disposed in the inner hole of the intermediate connecting member 4. Round head screws can be used to secure the power input shaft 33, the intermediate connecting member 4, and the connecting hole 612 together. Specifically, the power input shaft 33 can be a square shaft, and the inner hole of the intermediate connecting member 4 can be a corresponding square hole. The intermediate connecting member 4 is cylindrical in shape and provided with transverse ribs, while the connecting hole 612 is circular and provided with grooves that mate with the transverse ribs.

[0041] Install the power fine-tuning mechanism 6: Attach the adjustment wheel 63 to the control head inner rod 65. Then, attach the bidirectional torsion spring 62, with its opening facing the adjustment wheel sector ring 630. Then, install the control head sleeve 60 and the torsion core 61 in sequence. Install the sector ring of the torsion core 61 onto the side opposite the opening of the bidirectional torsion spring 62, with the two side posts of the bidirectional torsion spring 62 positioned midway between the adjustment wheel sector ring 630 and the sector ring of the torsion core 61. Once assembled, secure the control head inner rod 65 with screws 64 with washers.

[0042] Working Principle: The inner rod 65 of the control head is fixed to the right bracket 8. During curtain assembly, the control head sleeve 60 can swing the adjusting wheel 63. The adjusting wheel ring 630 pushes the bidirectional torsion spring 62, which in turn rotates the ring of the torsion core 61. The rotation of the torsion core 61 rotates the power input shaft 33, achieving pre-adjusted power and ensuring that the assembled curtain is not too loose or too tight.

[0043] When the curtain is opened or closed, the upper roll-up tube 9 rotates, allowing the control sleeve 60 to rotate flexibly clockwise and counterclockwise. The upper roll-up tube 9 drives the constant-force spring housing to rotate, and the constant-force spring mechanism 2 rotates along with it, a process called revolution. The power output shaft 34 of the power transmission mechanism 3 is fixed to the wheel 20 of the constant-force spring mechanism 2. The power output shaft 34 also revolves, driving the power transmission housing to rotate along with the upper roll-up tube 9. The power input shaft 33 in the power transmission mechanism 3 is fixedly connected to the torsion core 61. Since the torsion core 61 is stationary, the power input shaft 33 is also fixed and does not rotate. The remaining components of the power transmission mechanism 3 revolve around the axis of the power input shaft 33. Due to the meshing relationship between the intermediate gear 35 and the input gear on the power input shaft 33 and the output gear on the power output shaft 34, the intermediate gear 35 and the power output shaft 34 rotate while revolving. The power output shaft 34 drives the wheel 20 to rotate, winding the constant-force spring 22, thereby providing elastic force for the curtain.

[0044] When the power of the constant force spring 22 needs to be fine-tuned: rotate the adjusting wheel 63, and the adjusting wheel fan ring 630 contacts one of the columns of the bidirectional torsion spring 62 and pushes the bidirectional torsion spring 62. The bidirectional torsion spring 62 drives the fan ring of the torsion core 61 to rotate on the tail control inner rod 10, thereby adjusting the power of the constant force spring 22. Among them, if the torsion core 61 is actively rotated under force, pushing the column of the bidirectional torsion spring 62, the bidirectional torsion spring 62 and the tail control inner rod 10 are in a locked state and cannot rotate, and the adjusting wheel 63 will not rotate either, thereby avoiding unloading. The power fine-tuning mechanism 6 of the present invention can achieve power fine-tuning by actively rotating the adjusting wheel 63 and will not rotate in the opposite direction during the adjustment process.

[0045] At least one constant force spring mechanism 2 is set in the upper winding tube 9. If there are more than one, multiple constant force spring mechanisms 2 are set in series; the constant force spring mechanism 2 includes a constant force spring housing and a runner 20 and a spring sleeve 21 arranged side by side in the constant force spring housing; the constant force spring 22 rotates and is sleeved on the spring sleeve 21 and one end of the constant force spring 22 is fixed to the runner 20; one end of the runner 20 is provided with a runner shaft 23 extending from the constant force spring 22 housing, and the other end of the runner 20 is provided with an inner hole; different constant force spring mechanisms 2 are connected in series through the cooperation of the runner shaft 23 and the inner hole of the runner 20. The elastic force range of the constant force spring mechanism 2 can be further adjusted by the method of series setting. The scheme of the constant force spring mechanism 2 in series can also be combined with the scheme of the power transmission mechanism 3. The power transmission mechanism 3 is connected to the constant force spring mechanism 2 through the square hole on the runner 20 of the power output shaft 34 and the constant force spring mechanism 2. The connection part is designed with an undercut so that it will not shift or fall off after assembly. The connection between the constant force spring mechanism 2 and the constant force spring mechanism 2 is the same. The undercut assembly method between the shaft and the hole belongs to the prior art and will not be described in detail. Other shaft-hole anti-detachment connection methods can also be used.

[0046] In another embodiment, that is, an embodiment in which the power transmission mechanism 3 is not provided, the constant-force spring housing is retained within the upper roll-up tube 9; the axis of the rotating wheel 20 is coaxial with the axis of the upper roll-up tube 9, and the rotating wheel 20 and the output shaft of the power fine-tuning mechanism 6 are fixed to the torsion core 61; when the curtain is opened or closed, the constant-force spring housing rotates along with the upper roll-up tube 9, while the rotating wheel 20 and the output shaft of the power fine-tuning mechanism 6 do not rotate; the constant-force spring 22 rotates while the constant-force spring housing revolves, thereby winding back onto the rotating wheel 20; during power fine-tuning, the output shaft of the power fine-tuning mechanism 6 rotates, driving the rotating wheel 20 to rotate. In this structure, the power transmission mechanism 3 is not provided. The output shaft of the power fine-tuning mechanism 6 is directly connected concentrically to the rotating wheel 20, which is located at the center of the upper roll-up tube 9. Because of the structural setting of the power fine-tuning mechanism 6, the rotation of the output shaft of the power fine-tuning mechanism 6 can drive the runner 20 to rotate; however, if the runner 20 actively rotates, the power fine-tuning mechanism will lock, thereby preventing the runner 20 from rotating. The specific structure of the power fine-tuning mechanism 6 can refer to the previous content of this patent, or the structure in the previous patent, as long as it can achieve the purpose of driving the runner 20 to rotate and adjust the power without the runner flipping and unloading the force. There is no corresponding drawing for this structure. The existing drawings remove the power transmission mechanism 3, and directly connect the torsion core of the power fine-tuning mechanism to the runner, while the runner in the constant force spring housing is located in the center position.

[0047] In addition, the resistance mechanism 1 includes a tail-control inner rod 10, a tail-control inner core 11 sleeved on the tail-control inner rod 10, a tail-control sleeve 12 sleeved on the tail-control inner core 11, a first one-way torsion spring 13, a second one-way torsion spring 14 and a buckle cover 15; the first one-way torsion spring 13 is arranged between the tail-control inner rod 10 and the tail-control inner core 11, and the second one-way torsion spring 14 is arranged between the tail-control inner core 11 and the tail-control sleeve 12; the buckle cover 15 covers the right end surface of the tail-control sleeve 12 and is fixed to the right end of the tail-control inner rod 10 by a screw; when the curtain is pulled down, the resistance generated by pushing the first one-way torsion spring 13 clockwise is greater than the force generated by pushing the second one-way torsion spring 14 counterclockwise when the curtain is rolled back. Specifically, a first column groove is provided on the tailing inner core 11 corresponding to the column position of the first one-way torsion spring 13; a second column groove is provided on the inner surface of the tailing sleeve 12 corresponding to the column position of the second one-way torsion spring 14. During installation, the second one-way torsion spring 14 is placed over the smaller diameter cylinder of the tailing inner core 11, paying attention to the direction of the column of the second one-way torsion spring 14 during installation. The tail control inner rod 10 is inserted from the side where the second one-way torsion spring 14 is installed, and the first one-way torsion spring 13 is installed on the tail control inner rod 10. After the first one-way torsion spring 13 column is installed, it is stuck in the column groove on the other side of the tail control inner core 11. When the tail control sleeve 12 is installed, the column of the second one-way torsion spring 14 should be installed in the column groove inside the tail control. The buckle cover 15 is buckled on the tail control inner rod 10, and the square groove in the buckle cover 15 is aligned with the square boss of the tail control inner rod 10, and then the buckle cover 15 is fixed to the tail control inner rod 10 using a round head screw.

[0048] Working Principle: Unidirectional resistance is achieved by the force difference generated by the first one-way torsion spring 13 and the second one-way torsion spring 14. During assembly, the tail control inner rod 10 is fixed to the left bracket 7. When the curtain is lowered, the tail control sleeve 12 rotates clockwise, driving the second one-way torsion spring 14. The second one-way torsion spring 14 rotates clockwise, locking with the tail control inner core 11 and driving the tail control inner core 11 to rotate. This then pushes the first one-way torsion spring 13. The first one-way torsion spring 13 rotates clockwise, creating friction with the tail control inner rod 10 and generating a certain amount of resistance. When the tail control sleeve 12 rotates counterclockwise, the first one-way torsion spring 13 locks with the tail control inner rod 10, and the tail control inner core 11 is fixed due to the action of the first one-way torsion spring 13. The tail control sleeve 12 then pushes the second one-way torsion spring 14 to rotate. When the curtain is lowered, the resistance generated by the clockwise push of the first one-way torsion spring 13 is greater than the counterclockwise force generated by the second one-way torsion spring 14 when the curtain is retracted. The counterclockwise force generated by the second one-way torsion spring 14 must be minimized while ensuring functionality. The clockwise resistance can be adjusted by adjusting the first one-way torsion spring 13 or adjusting the coordination between the first one-way torsion spring 13 and the inner tail rod 10 to achieve the desired resistance. The resistance mechanism 1 can also be a conventional resistance mechanism 1 and can be directly applied to this curtain system. The curtain system's upper roller curtain is provided with a cover 91 and a crossbeam at its lower end. These are prior art and will not be described in detail.

[0049] During specific implementation: the resistance mechanism 1 is installed into the upper roll tube 9 from the left side of the curtain and fixed with the left bracket 7. The assembled constant force spring mechanism 2, power transmission mechanism 3 and power fine-tuning mechanism 6 are installed into the roll tube from the right side of the curtain and fixed with the right bracket 8. After rotating the adjustment wheel 63, the bidirectional torsion spring 62, the torsion core 61, the gear input shaft, the intermediate gear 35, the gear output shaft, the rotating wheel 20 and the constant force spring 22 are linked to achieve force adjustment. When the curtain is opened or closed, the upper roll tube 9 rotates, which drives the rotating wheel 20 to rotate. The constant force spring 22 is rolled back on the rotating wheel 20 to generate the curtain recovery force. The resistance mechanism 1 provides a rewinding force as resistance during the process of pulling the curtain down. This rewinding force, the gravity of the lower beam 90 at the lower end of the curtain body 5 and the elastic force of the constant force spring 22 form a balancing force. When the curtain is retracted, the balance is broken and the curtain is quickly retracted.

[0050] The constant force spring non-pull curtain system of the present invention can be applied to small diameter curtains such as 38mm diameter, can be matched with the existing bead system bracket, and can be applied to the existing curtain body. The present invention is simple to assemble, and the adjusting wheel 63 can be used for pre-tightening at any time after assembly. It is not necessary to rotate the upper roll tube 9 for pre-tightening during assembly, which makes the operation more convenient. The constant force spring 22 power system is placed in the upper roll tube 9, and the power fine-tuning mechanism 6 is placed on the inside of the right bracket 8, which is convenient for fine-tuning the power of the curtain. Fine-tuning can be achieved without removing the curtain, and the lateral space occupied is small, which reduces the space occupied by the width of the fabric and increases the shading width of the curtain.

[0051] In addition, the curtain specifications of the present invention are more widely applicable. Not only can the specifications of the constant force spring 22 in a single constant force spring mechanism be adjusted to adapt to the curtain specifications, but multiple constant force spring mechanisms 2 can also be selected to cooperate in series. By adjusting the specifications of the constant force spring mechanism 2 and the number of series connections to select a power more suitable for the curtain, the curtain is more smoothly deployed and retracted, greatly reducing the need to increase counterweight due to adjusting the power balance, thus saving costs. When the power is adjusted to suit the curtain, the force on the main body of the curtain is relatively reduced, thereby reducing the tension on the upper roll tube 9 and the lower beam 90. The requirements of the curtain specifications for the lower beam are also reduced, reducing the shaking caused by the increased tension when large-sized curtains are pulled down.

[0052] The various technical features of the above-described embodiments may be arbitrarily combined, and as long as there is no contradiction in the combination of these technical features, they shall be considered to be within the scope of this specification. Without departing from the overall concept of the present invention, the technical solutions according to the present invention and their equivalent replacement or modification, as well as the various changes and improvements made thereto, shall also be considered to be within the scope of protection of the present invention.

Claims

1. A constant-force spring pull-free curtain system, comprising a curtain body and an upper roll-up tube connected to the upper end of the curtain body. One end of the upper roll-up tube is connected to a left bracket via a resistance mechanism, and the other end is connected to a right bracket via a constant-force spring power system. The constant-force spring power system includes a constant-force spring mechanism equipped with a constant-force spring and a power fine-tuning mechanism for adjusting the elastic force of the constant-force spring. The system is characterized by: The constant force spring mechanism is arranged inside the upper winding tube, and the power fine adjustment mechanism connected to the constant force spring mechanism is connected to the right bracket; The constant force spring mechanism includes a constant force spring housing, a rotating wheel and a spring sleeve arranged side by side in the constant force spring housing; the constant force spring is rotatably sleeved on the spring sleeve and one end of the constant force spring is fixed to the rotating wheel; the rotating wheel is rotatably arranged on the constant force spring housing; when the curtain is opened or closed, the upper winding tube rotates to drive the constant force spring to be wound on the rotating wheel; when the power is fine-tuned, the upper winding tube does not rotate, and the power fine-tuning mechanism drives the rotating wheel to rotate; A power transmission mechanism is provided between the power fine-tuning mechanism and the constant-force spring mechanism, the power transmission mechanism comprising a power input shaft and a power output shaft which are staggered and transmit power through a gear mechanism; the power output shaft is concentric with and fixedly connected to the rotating wheel; the axis of the rotating wheel and the axis of the spring sleeve are respectively arranged on both sides of the axis of the upper winding tube; the torsion core of the power fine-tuning mechanism is fixed to the power input shaft and transmits fine-tuning power; the torsion core and the power input shaft are coaxial with the upper winding tube; The resistance mechanism includes a tail-control inner rod fixedly connected to the left bracket at its left end, a tail-control inner core sleeved on the tail-control inner rod, a tail-control sleeve sleeved on the tail-control inner core, a first one-way torsion spring, a second one-way torsion spring and a buckle cover; the first one-way torsion spring is arranged between the tail-control inner rod and the tail-control inner core, and the second one-way torsion spring is arranged between the tail-control inner core and the tail-control sleeve; the buckle cover covers the right end surface of the tail-control sleeve and is fixed to the right end of the tail-control inner rod by a screw; when the curtain is pulled down, the resistance generated by pushing the first one-way torsion spring clockwise is greater than the force generated by pushing the second one-way torsion spring counterclockwise when the curtain is rolled back.

2. The constant force spring pull-free curtain system according to claim 1, characterized in that: The power transmission mechanism includes a power transmission shell with a cavity arranged inside, and the power input shaft and the power output shaft are rotatably arranged in the power transmission shell respectively, an input gear is fixedly arranged on the power input shaft, and an output gear is fixedly arranged on the power output shaft; an intermediate gear is also rotatably arranged in the power transmission shell, and the input gear and the output gear are respectively engaged with the intermediate gear; the power input shaft and the power output shaft respectively pass through two opposite surfaces of the power transmission shell.

3. The constant force spring pull-free curtain system according to claim 2, characterized in that: The constant force spring housing is stuck in the upper winding tube and rotates with the upper winding tube; the power fine-tuning mechanism includes a braking sleeve, an adjusting wheel, a braking inner rod, a bidirectional torsion spring and the torsion core fixed and concentric with the upper winding tube, wherein the adjusting wheel includes a wheel disk with an inner hole and an adjusting wheel fan ring arranged concentrically with the wheel disk; one end of the torsion core is provided with a connecting end connected to the power input shaft, and the other end is provided with a torsion core fan ring; the braking inner rod is fixedly connected to the right bracket; the adjusting wheel is sleeved on the braking inner rod, and at least one bidirectional torsion spring is sleeved on the braking inner rod, the torsion core fan ring and the adjusting wheel fan ring are respectively sleeved on the outside of the braking inner rod and have a gap with the outer surface of the braking inner rod, the two side surfaces of the torsion core fan ring and the two side surfaces of the adjusting wheel fan ring respectively constitute two gap spaces, and the two columns of each bidirectional torsion spring are respectively arranged in the two gap spaces; the braking sleeve is fixed in the upper winding tube, and the braking sleeve is sleeved on the outside of the torsion core fan ring and the adjusting wheel fan ring.

4. The constant force spring pull-free curtain system according to claim 3, characterized in that: A first limiting ring is provided on the outer surface of the connecting end of the torsion core, and the limiting ring of the torsion core and the disc of the adjusting wheel respectively limit the left and right sides of the control sleeve; a connecting hole is provided in the connecting end of the torsion core, and a second limiting ring is provided in the connecting hole near the left end of the control inner rod, and a threaded hole is provided at the left end of the control inner rod, and a screw with a gasket is provided in the connecting hole on the left side of the second limiting ring, and the screw with a gasket cooperates with the threaded hole to connect the control inner rod and the torsion core, and the connecting end of the torsion core is rotatably provided on the outer surface of the control inner rod; an inner rod limiting disk is provided at the right end of the control inner rod, and the inner rod limiting disk is clamped at the right end of the disc; the connecting hole is fixedly connected to the intermediate connecting piece, and one end of the power input shaft is fixedly provided in the inner hole of the intermediate connecting piece.

5. A constant force spring pull-free curtain system according to any one of claims 1 to 4, characterized in that: At least one constant force spring mechanism is arranged in the upper winding tube, and adjacent constant force spring mechanisms are arranged in series; the constant force spring mechanism includes a constant force spring housing and a rotating wheel and a spring sleeve arranged side by side in the constant force spring housing; the constant force spring is rotatably sleeved on the spring sleeve and one end of the constant force spring is fixed to the rotating wheel; a rotating wheel shaft extending out of the constant force spring housing is provided at one end of the rotating wheel, and an inner hole is provided at the other end of the rotating wheel; different constant force spring mechanisms are connected in series through the cooperation of the rotating wheel shaft and the inner hole of the rotating wheel.

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