Curtain and cord-winding device thereof
By using a return spring in the curtain cord winding device to push the pawl to engage with the ratchet, the problem of unstable pawl return is solved, resulting in a compact structure and stable curtain descent, thus improving the stability and safety of curtain use.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGDONG LEAFY WINDOWARE CO LTD
- Filing Date
- 2024-12-19
- Publication Date
- 2026-06-25
AI Technical Summary
In existing curtain cord winding devices, the pawls rely on their own weight to return to their unstable position, causing the curtain to become unbalanced and fall, and making it easy for the cord to get tangled, thus affecting the performance.
A return spring is used to push the pawl to maintain engagement with the ratchet, avoiding reliance on the pawl's gravity, enhancing the pawl's positional flexibility, and using elastic thrust to ensure the pawl returns to its position quickly, preventing the curtain from falling unbalancedly.
The internal structure of the rope winding device is compact, reducing its size, and it can quickly respond to the curtain tilt to prevent it from falling, avoid curtain imbalance, and improve the stability of use.
Smart Images
Figure CN2024140662_25062026_PF_FP_ABST
Abstract
Description
Curtains and their cord winding devices Technical Field
[0001] This application relates to the field of curtain accessories technology, and in particular to a curtain and its cord winding device. Background Technology
[0002] An existing curtain includes: a top beam, two curtain cord winding devices assembled on the top beam at predetermined intervals, a curtain body disposed below the top beam and connected to the curtain cord winding devices, and a power device for driving the curtain cord winding devices to lift the curtain body. The curtain cord winding device further includes a base, a cord winding drum pivotally mounted on the base and connected to the power device via a drive shaft, and a support cord wound on the cord winding drum, the outer end of which extends from the cord winding drum and connects to the curtain body; and a braking assembly assembled on the base. The braking assembly includes a ratchet fixed coaxially with the drive shaft and a pawl pivotally mounted on the base for unidirectional locking of the ratchet. The carrying rope is led out from the winding drum, passes through one end of the pawl, and is then connected to the curtain. When the curtain is pulled down, the carrying rope is taut and applies pressure to the pawl, causing the pawl to rotate and disengage from the ratchet. The winding drum can then rotate to release the carrying rope, and the curtain can continue to descend. When the carrying rope is slack, the pawl is not subjected to the pressure of the carrying rope and returns to the position where it engages with the ratchet under gravity, so that the winding drum can only rotate unidirectionally in the direction of winding the carrying rope. Since the two curtain cord winding devices are usually located on the upper beam at the two ends corresponding to the width of the curtain, if the curtain becomes unbalanced with one end higher than the other during the process of pulling down the curtain, the carrying cord corresponding to the relatively higher end of the curtain will not be tightened and will become loose. In this case, the braking component in the corresponding curtain cord winding device will be engaged by the pawl on the ratchet, the drive shaft will not rotate, the cord winding drum will not be able to release the carrying cord, thereby preventing the curtain from continuing to descend.
[0003] In their practical implementation, the inventors discovered that the pawl in the braking assembly relies on its own weight to return to its original position, which severely limits the pawl's placement and is detrimental to the layout design of the various components of the rope winding device. Furthermore, during the curtain pull-down process, if the load-bearing rope on one side becomes slack, the corresponding pawl may not reset in time. This not only causes the curtain to continue being pulled down in an unbalanced state, but also makes the slack load-bearing rope prone to abnormal entanglement or snagging, thus affecting the normal use of the curtain. Technical issues
[0004] The technical problem to be solved by the embodiments of this application is to provide a curtain cord winding device that facilitates component layout design and enables the pawl to return to its position quickly.
[0005] A further technical problem to be solved by the embodiments of this application is to provide a curtain that allows the pawl of the rope winding device to return to its original position quickly and effectively prevents the curtain from falling unbalancedly. Solution
[0006] To address the aforementioned technical problems, this application provides the following technical solution: a curtain cord winding device, comprising:
[0007] A base assembled on the top beam of the curtain;
[0008] A rope winding drum is pivotally mounted on the base and connected to an external power device via a coaxially arranged drive shaft.
[0009] A carrying rope, with its inner end wound around the rope bob and its outer end extending from the rope bob and connected to the curtain body; and
[0010] A braking assembly assembled on the base, the braking assembly comprising:
[0011] A ratchet fixed coaxially with the drive shaft;
[0012] A pawl, pivotally mounted on the base via a first pivot and used to control the unidirectional rotation of the ratchet, includes a pawl component that engages with the ratchet teeth of the ratchet and a pressing component for the carrying rope to press against it in a directional manner; and
[0013] A first return spring is assembled on the base and is used to apply an elastic thrust to the pawl component so that the pawl component is engaged with the ratchet teeth of the ratchet.
[0014] After the outer end of the carrying rope is led out from the rope winding cylinder, it first passes through the pressing component and then connects to the curtain. When the carrying rope is under tension and taut, it applies a pressing force to the pressing component to cause the claw component to overcome the elastic thrust and rotate to a position where it disengages from the ratchet.
[0015] Furthermore, the claw component and the pressing component are two separately manufactured independent components. One end of the claw component is formed with a claw for engaging with the ratchet, while the other end is pivotally mounted on the base via the first pivot. The pressing component includes a transmission rod whose middle section is pivotally connected to the base via a second pivot, and whose opposite ends respectively form a control end and a drive end. The carrying rope presses against the control end, and the drive end abuts against the end of the claw component where the claw is formed. When the carrying rope is taut, it presses against the control end, causing the pressing component to rotate. When the drive end pushes against the claw component, the claw disengages from the ratchet.
[0016] Furthermore, the pawl component has a socket at one end where the pawl is formed, and the end of the drive end is correspondingly formed with a push block that is movably inserted into the socket and abuts against the inner wall of the socket on the side away from the ratchet.
[0017] Furthermore, the pressing component also includes a second return spring for pushing the transmission rod to a position where the pawl engages with the ratchet.
[0018] Furthermore, the pawl is provided with a first receiving groove on the side away from the ratchet. The middle section of the first pivot is placed in the first receiving groove, and its opposite ends penetrate through the opposite side walls of the first receiving groove for pivoting into the corresponding first pivot holes on the base. The middle section of the first pivot is also pivotally connected to a first pressing seat. The opposite ends of the first return spring press against the bottom wall of the first receiving groove and the first pressing seat, respectively. The first pressing seat is also formed with a first positioning part that limits the position of the first return spring.
[0019] Furthermore, the first positioning part is a first side baffle extending parallel to the opposite side walls of the first storage groove on both sides of one side of the first pressing seat toward the bottom wall of the first storage groove, and the first reset spring is a first torsion spring correspondingly sleeved on the middle section of the first pivot and located between the two first side baffles, and the two torsion arms of the first torsion spring respectively press against the bottom wall of the first storage groove and the first pressing seat.
[0020] Furthermore, the transmission rod is provided with a second receiving groove on the side away from the ratchet. The middle section of the second pivot is placed in the second receiving groove, and its opposite ends penetrate the opposite side walls of the second receiving groove for pivoting into the corresponding second pivot holes on the base. The middle section of the second pivot is also pivotally connected to a second pressing seat. The opposite ends of the second return spring press against the bottom wall of the second receiving groove and the second pressing seat, respectively. The second pressing seat is also formed with a second positioning part that limits the position of the second return spring.
[0021] Furthermore, the second positioning part is a second side baffle extending parallel to the opposite side walls of the second storage groove on one side of the second pressing seat toward the bottom wall of the second storage groove. The second return spring is a second torsion spring correspondingly sleeved on the middle section of the second pivot and located between the two second side baffles. The two torsion arms of the second torsion spring respectively press against the bottom wall of the second storage groove and the second pressing seat.
[0022] Furthermore, the pressing component is provided with a rope groove for the carrying rope to pass through in a directional manner. One side of the rope groove is provided with an opening for the carrying rope to be inserted into the rope groove. The top of the groove sidewalls on both sides of the opening protrudes in opposite directions to form blocks to prevent the carrying rope from slipping out of the rope groove. The opposite ends of the rope groove are also provided with end openings that communicate with the opening and allow the carrying rope to slide in and out of the rope groove. The bottom wall of the rope groove is provided with a guide rod with a smooth outer side wall for the carrying rope to press against.
[0023] On the other hand, in order to solve the above-mentioned further technical problems, the present application provides the following technical solution: a curtain, including a top beam, two curtain rope winding devices assembled on the top beam at a predetermined interval, a curtain body disposed below the top beam and connected to the curtain rope winding devices, and a power device for synchronously driving the two rope winding devices to work to lift the curtain body, wherein the curtain rope winding device is a curtain rope winding device as described in any of the above claims. Beneficial effects
[0024] After adopting the above technical solution, the embodiments of this application have at least the following beneficial effects: By adding a first return spring to the base to constantly elastically press against the pawl component of the braking assembly, the embodiments of this application can always push the pawl component to maintain engagement with the ratchet teeth of the ratchet, without relying on the weight of the pawl itself to maintain engagement with the ratchet teeth. This allows for more flexible design of the pawl position, which is beneficial for the spatial layout design of the internal components of the rope winding device, making the internal structure of the rope winding device more compact and reducing the overall volume of the rope winding device. When applied to curtains, one of the rope winding devices is set at each end of the upper beam to connect the curtain body. During the process of pulling down the curtain body, if the curtain body tilts, the carrying rope of the rope winding device located at the higher end of the curtain body will slack. The elastic thrust of the corresponding first return spring can ensure that the pawl component quickly returns to its original position and engages with the ratchet teeth of the ratchet again, thereby preventing the rotation of the transmission shaft coaxially connected to the ratchet. The curtain body can no longer be pulled down, thus avoiding an unbalanced descent of the curtain body. Attached Figure Description
[0025] Figure 1 is a schematic diagram of the split structure of an optional embodiment of the curtain of this application.
[0026] Figure 2 is a schematic diagram of the disassembled structure of an optional embodiment of the curtain cord winding device of this application, installed on the base portion.
[0027] Figure 3 is a schematic diagram of the disassembled structure of the braking component of an optional embodiment of the curtain rope winding device of this application.
[0028] Figure 4 is a cross-sectional structural diagram of the braking component of an optional embodiment of the curtain rope winding device of this application when the pawl part is engaged with a ratchet tooth of the ratchet.
[0029] Figure 5 is a cross-sectional structural diagram of the braking component of an optional embodiment of the curtain rope winding device of this application when the pawl part is separated from a ratchet tooth of the ratchet.
[0030] Figure 6 is a schematic diagram of the disassembled structure of the curtain rope winding device of this application installed on the base part in another optional embodiment.
[0031] Figure 7 is a schematic diagram of the disassembled structure of the braking component in another optional embodiment of the curtain rope control device of this application.
[0032] Figure 8 is a cross-sectional structural diagram of the brake component of the curtain rope winding device of this application when it is engaged with a ratchet tooth of the ratchet.
[0033] Figure 9 is a cross-sectional structural diagram of the braking component of the curtain rope winding device of this application when the pawl part is separated from a ratchet tooth of the ratchet. Embodiments of the present invention
[0034] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present application and are not intended to limit the present application. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.
[0035] As shown in Figures 1-9, one optional embodiment of this application provides a curtain cord winding device 1, comprising:
[0036] The base 10 is assembled on the upper beam 3 of the curtain;
[0037] A rope winding drum 12 is pivotally mounted on the base 10 and is connected to an external power device 4 via a coaxially arranged transmission shaft 11.
[0038] A carrying rope 13, with its inner end wound around the rope winding cylinder 12 and its outer end extending from the rope winding cylinder 12 and connected to the curtain body 5 of the curtain; and
[0039] Braking assembly 14 is assembled on the base 10, the braking assembly 14 comprising:
[0040] A ratchet 141 is fixed coaxially with the drive shaft 11;
[0041] A pawl 143, pivotally mounted on the base 10 via a first pivot 142 and used to control the unidirectional rotation of the ratchet 141, includes a pawl component 1430 that engages with the ratchet teeth 1410 of the ratchet 141 and a pressing component 1432 for the carrying rope 13 to be pressed against it in a directional manner; and
[0042] A first return spring 145 is assembled on the base 10 and is used to apply an elastic thrust to the pawl component 1430 so that the pawl component 1430 is engaged with the ratchet teeth 1410 of the ratchet 141;
[0043] After the outer end of the carrying rope 13 is led out from the winding drum 12, it first passes through the pressing member 1432 and then connects to the curtain. When the carrying rope 13 is under tension and taut, it applies a pressing force to the pressing member 1432 to cause the claw member 1430 to overcome the elastic thrust and rotate to a position where it is disengaged from the ratchet 1410.
[0044] In this embodiment, a first return spring 145 is added to the base 10 to elastically press against the pawl component 1430 of the braking assembly 14, thereby constantly pushing the pawl component 1430 to keep it engaged with the ratchet tooth 1410 of the ratchet 141. This does not rely on the weight of the pawl 143 itself to keep engaged with the ratchet tooth 1410, thus allowing for more flexible design of the pawl 143 position. This is beneficial for the spatial layout design of the internal components of the rope winding device 1, making the internal structure of the rope winding device 1 more compact and reducing the overall volume of the rope winding device 1. When applied to curtains, a rope winding device 1 is installed at each end of the upper beam 3 to connect the curtain body. During the process of pulling down the curtain body 5, if the curtain body 5 becomes skewed, the load-bearing rope of the rope winding device 1 located at the higher end of the curtain body 5 will become loose. The elastic thrust of the first return spring 145 can ensure that the claw component 1430 quickly returns to its original position and engages with the ratchet 1410 of the ratchet 141, thereby preventing the rotation of the transmission shaft 11 coaxially connected with the ratchet 141. The curtain body 5 can no longer be pulled down, thus avoiding an unbalanced descent of the curtain body 5.
[0045] In an optional embodiment of this application, as shown in Figures 2-5, the claw component 1430 and the pressing component 1432 are two separately manufactured independent components. One end of the claw component 1430 is formed with a claw 1430a for engaging with the ratchet 1410, while the other end is pivotally mounted on the base 10 via the first pivot 142. The pressing component 1432 includes a middle section pivotally mounted on the base 10 via a second pivot 1434a, and its two ends respectively constitute control... The transmission rod 1434 of end 1434b and drive end 1434c, the carrying rope 13 abuts against the control end 1434b, the drive end 1434c abuts against the end of the pawl component 1430 where the pawl 1430a is formed, when the carrying rope 13 is taut it abuts against the control end 1434b, so that when the pressing component 1432 rotates, the drive end 1434c pushes against the pawl component 1430, so that the pawl 1430a disengages from the ratchet 1410.
[0046] In this embodiment, during operation, the taut carrying rope 13 presses against the control end 1434b of the transmission rod 1434, causing the transmission rod 1434 to rotate around the second pivot 1434a. Since one end of the pawl component 1430 is pivotally mounted on the base 10 via the first pivot 142 and the other end is formed with a pawl 1430a, the pawl 1430a engages with the ratchet 1410 under the elastic pushing action of the first return torsion spring 145. At the same time, the drive end 1434c of the transmission rod 1434 engages with the pawl component 1434a. The 0 forms abutment between the end of the pawl 1430a and the ratchet 1410. Therefore, when the transmission rod 1434 rotates around the second pivot 1434a, the transmission rod 1434 pushes the end of the pawl component 1430 with the pawl 1430a to overcome the elastic force of the first reset torsion spring 145 and rotate around the first pivot 142 through the drive end 1434c, thereby separating the pawl 1430a from the ratchet 1410. When the carrying rope 13 is slack, both the transmission rod 1434 and the pawl component 1430 can automatically reset under the action of the first reset torsion spring 145.
[0047] In an optional embodiment of this application, as shown in Figures 3-5, the end of the pawl component 1430 where the pawl 1430a is formed also has an insertion hole 1430b. The end of the drive end 1434c correspondingly forms a push block 1434d that is movably inserted into the insertion hole 1430b and abuts against the inner wall of the insertion hole 1430b away from the ratchet 141. In this embodiment, the drive end 1434c of the transmission rod 1434 is movably inserted into the insertion hole 1430b of the pawl component 1430 through the push block 1434d. The engagement of the push block 1434d with the insertion hole 1430b achieves a stable pushing engagement between the transmission rod 1434 and the pawl component 1430.
[0048] In an optional embodiment of this application, as shown in Figures 3-5, the pressing component 1432 further includes a second return spring 1436 for pushing the transmission rod 1434 to a position where the pawl 1430a engages with the ratchet 1410. In this embodiment, the pressing component 1432 further includes the second return spring 1436, which assists the first return torsion spring 145 in achieving automatic reset of the transmission rod 1434.
[0049] In specific implementations, as shown in Figures 6-9, the pawl component 1430 and the pressing component 1432 are integrally formed and respectively disposed on both sides of the first pivot 142. One end of the pawl component 1430 is formed with a pawl 1430a for engaging with the ratchet 1410. The pawl component 1430 and the pressing component 1432 are directly integrally formed, and the ratchet 143 can be directly assembled onto the base 10 as a whole, making the assembly structure simpler.
[0050] In an optional embodiment of this application, as shown in Figures 3-5 and 7-9, the pawl 143 is provided with a first receiving groove 143a on the side opposite to the ratchet 141. The middle section of the first pivot 142 is placed in the first receiving groove 143a, and its opposite ends penetrate through the opposite side walls of the first receiving groove 143a for pivoting into the corresponding first pivot hole 101a on the base 10 (as shown in Figure 7). The middle section of the first pivot 142 is also pivotally connected to a first pressing seat 143b. The opposite ends of the first return spring 145 press against the bottom wall of the first receiving groove 143a and the first pressing seat 143b, respectively. The first pressing seat 143b is also formed with a first positioning part 143c that limits the position of the first return spring 145. In this embodiment, by providing a first storage slot 143a to store the first return spring 145, the space occupied can be effectively reduced. Moreover, the first return spring 145 abuts against the base 10 through the first pressing seat 143b, which facilitates the smooth release of the elastic thrust of the first return spring 145. Furthermore, the first pressing seat 143b is also provided with a first positioning part 143c to prevent the first return spring 145 from being deformed by force during the extension and retraction process and thus causing positional displacement.
[0051] In an optional embodiment of this application, as shown in Figures 3-5 and 7-9, the first positioning part 143c is a first side baffle extending parallel to the opposite side walls of the first storage groove 143a from one side of the first pressing seat 143b toward the bottom wall of the first storage groove 143a. The first return spring 145 is a first torsion spring correspondingly sleeved on the middle section of the first pivot 142 and located between the two first side baffles 143c. The two torsion arms of the first torsion spring 145 respectively press against the bottom wall of the first storage groove 143a and the first pressing seat 143b. In this embodiment, the first return spring 145 is a first torsion spring sleeved in the middle section of the first pivot 142. This not only enables the positioning of the first torsion spring using the first pivot 142, but also facilitates the smooth release of torsional power by the two torsion arms of the first torsion spring through torsion. In addition, the first positioning part 143c adopts a first side baffle extending from the first pressing seat 143b, which can effectively limit the torsion arms of the first torsion spring to the first pressing seat 143b.
[0052] In an optional embodiment of this application, as shown in Figures 3-5, the transmission rod 1434 is provided with a second receiving groove 1434e on the side opposite to the ratchet 141. The middle section of the second pivot 1434a is placed in the second receiving groove 1434e, and its opposite ends penetrate through the opposite side walls of the second receiving groove 1434e for pivoting into the corresponding second pivot hole 101b on the base 10 (as shown in Figure 3). The middle section of the second pivot 1434a is also pivotally connected to a second pressing seat 1434f. The opposite ends of the second return spring 1436 press against the bottom wall of the second receiving groove 1434e and the second pressing seat 1434f, respectively. The second pressing seat 1434f is also formed with a second positioning part 1434g that limits the position of the second return spring 1436. In this embodiment, by providing a second storage slot 1434e to store the second return spring 1436, the space occupied can be effectively reduced. Moreover, the second return spring 1436 abuts against the base 10 through the second pressing seat 1434f, which facilitates the smooth release of the elastic thrust of the second return spring 1436. Furthermore, the second pressing seat 1434f is also provided with a second positioning part 1434g to prevent the second return spring 1436 from being deformed by force during the extension and retraction process and thus causing positional displacement.
[0053] In an optional embodiment of this application, as shown in Figures 3-5, the second positioning part 1434g is a second side baffle extending parallel to the opposite side walls of the second storage groove 1434e from one side of the second pressing seat 1434f toward the bottom wall of the second storage groove 1434e. The second return spring 1436 is a second torsion spring correspondingly sleeved on the middle section of the second pivot 1434a and located between the two second side baffles 1434g. The two torsion arms of the second torsion spring 1436 respectively press against the bottom wall of the second storage groove 1434e and the second pressing seat 1434f. In this embodiment, the second return spring 1436 is a second torsion spring sleeved in the middle section of the second pivot 1434a. This not only enables the positioning of the second torsion spring using the second pivot 1434a, but also facilitates the smooth release of torsional power by the two torsion arms of the second torsion spring through torsion. In addition, the second positioning part 1434g adopts a second side baffle extending from the second pressing seat 1434f, which can effectively limit the torsion arms of the second torsion spring to the second pressing seat 1434f.
[0054] In an optional embodiment of this application, as shown in Figures 3-5 and 7-9, the pressing component 1432 is provided with a rope groove 1438 through which the carrying rope 13 passes. One side of the rope groove 1438 is provided with a slot 1438a for the carrying rope 13 to be inserted into the rope groove 1438. The top of the sidewalls on both sides of the slot 1438a are alternately protruding towards each other to form a stop block 1438b for preventing the carrying rope 13 from sliding out of the rope groove 1438. The opposite ends of the rope groove 1438 are also provided with end openings 1438c that communicate with the slot 1438a and allow the carrying rope 13 to slide in and out of the rope groove 1438. The bottom wall of the rope groove 1438 is provided with a guide rod 1438d with a smooth outer side wall for the carrying rope 13 to press against. In this embodiment, the pressing component 1432 is also provided with a rope groove 1438. During specific assembly, the carrying rope 13 can be directly inserted into the rope groove 1438 from the groove opening 1438a. This not only facilitates assembly, but also makes it less likely for the carrying rope 13 to separate from the pressing component 1432 of the pawl 143, ensuring that the carrying rope 13 applies a stable pressing force when taut. Furthermore, the guide rod 1438d is assembled in the rope groove 1438. During the winding and unwinding process, the carrying rope 13 abuts against the guide rod 1438d, which has a smooth outer side wall, thereby reducing the wear of the carrying rope 13 and extending its service life.
[0055] In a specific implementation, as shown in Figures 2-9, the base 10 includes a mounting seat 101 for the rope winding cylinder 12 to be pivotally mounted thereon and a brake box 103 fixedly assembled to one end of the mounting seat 101. The drive shaft 11 passes through the mounting seat 101 and the brake box 103 in sequence. The brake assembly 14 is assembled inside the brake box 103. One side wall of the brake box 103 has an opening 1030 for one end of the pressing member 1432 of the pawl 143 to be exposed. In this embodiment, the base 10 includes a mounting seat 101 and a brake box 103. The brake assembly 14 is housed in the brake box 103. During specific assembly, the brake box 103 with the brake assembly 14 assembled can be directly assembled onto one end of the mounting seat 101. Then, the carrying rope 13 can be passed around the pressing member 1432 exposed on one side wall of the brake box 103b, which can effectively facilitate assembly and optimize the structural layout.
[0056] On the other hand, as shown in Figure 1, this application embodiment provides another type of curtain, including a top beam 3, two curtain cord winding devices 1 assembled on the top beam 3 at a predetermined interval, a curtain body 5 disposed below the top beam 3 and connected to the curtain cord winding devices 1, and a power device 4 for synchronously driving the two cord winding devices 1 to work and lift the curtain body 5. The curtain cord winding device is the curtain cord winding device as described in any of the above embodiments. In this embodiment, the curtain uses the cord winding device 1 provided in any of the above embodiments. During the process of pulling down the curtain body 5, if the curtain body 5 becomes skewed, the carrying cord of the cord winding device 1 located at the higher end of the curtain body 5 will become loose. The elastic thrust of the corresponding first return spring 145 can ensure that the claw component 1430 quickly returns to its original position and engages with the ratchet 1410 of the ratchet 141, thereby preventing the rotation of the transmission shaft 11 coaxially connected to the ratchet 141. The curtain body 5 can no longer be pulled down, thereby avoiding an unbalanced descent of the curtain body 5.
[0057] In specific implementations, although the curtain shown in Figure 1 is a Venetian blind, the curtain provided in this embodiment can also be applied to honeycomb blinds and Roman blinds, etc., where the curtain body 5 is raised and lowered via the support rope 13. The two curtain rope winding devices 1 are connected to the same power device 4, thereby ensuring the synchronicity of the raising and lowering of the support rope 13 by the two curtain rope winding devices 1, and reducing costs. In specific implementations, the power device 4 can be a spring motor driver, and the power device 4 can be assembled between the two curtain rope winding devices 1, thus facilitating structural layout.
[0058] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of this application.
Claims
1. A curtain cord winding device, comprising: A base assembled on the top beam of the curtain; A rope winding drum pivotally mounted on the base and connected to an external power device via a coaxially arranged drive shaft; A carrying rope, with its inner end wound around the rope bob and its outer end extending from the rope bob and connected to the curtain body; and A braking assembly assembled on the base includes a ratchet fixed coaxially with the drive shaft and a pawl pivotally mounted on the base via a first pivot for controlling the unidirectional rotation of the ratchet. The pawl includes a pawl component that engages with the ratchet teeth of the ratchet and a pressing component for the carrying rope to press against it in a directional manner. The braking assembly is characterized in that it further includes: A first return spring is assembled on the base and is used to apply an elastic thrust to the pawl component so that the pawl component is engaged with the ratchet teeth of the ratchet. After the outer end of the carrying rope is led out from the rope winding cylinder, it first passes through the pressing component and then connects to the curtain. When the carrying rope is under tension and taut, it applies a pressing force to the pressing component to cause the claw component to overcome the elastic thrust and rotate to a position where it disengages from the ratchet.
2. The window covering cord winding device of claim 1, wherein, The pawl component and the pressing component are two separately manufactured independent components. One end of the pawl component is formed with a pawl for engaging with the ratchet, while the other end is pivotally mounted on the base via the first pivot. The pressing component includes a transmission rod whose middle section is pivotally connected to the base via a second pivot, and whose opposite ends respectively form a control end and a drive end. The carrying rope presses against the control end, and the drive end abuts against the end of the pawl component where the pawl is formed. When the carrying rope is taut, it presses against the control end, causing the pressing component to rotate. When the drive end pushes against the pawl component, the pawl disengages from the ratchet.
3. The window shade cord winding device of claim 2, wherein, The pawl component has a pawl at one end and a socket at the other end. The drive end has a push block that is movably inserted into the socket and abuts against the inner wall of the socket on the side away from the ratchet.
4. The curtain cord winding device as described in claim 2, characterized in that, The pressing component further includes a second return spring for pushing the transmission rod to a position where the pawl engages with the ratchet.
5. The curtain cord winding device as described in claim 1, characterized in that, The pawl is provided with a first receiving groove on the side away from the ratchet. The middle section of the first pivot is placed in the first receiving groove, and its opposite ends pass through the opposite side walls of the first receiving groove for pivoting into the corresponding first pivot holes on the base. The middle section of the first pivot is also pivotally connected to a first pressing seat. The opposite ends of the first return spring press against the bottom wall of the first receiving groove and the first pressing seat, respectively. The first pressing seat is also formed with a first positioning part that limits the position of the first return spring.
6. The curtain cord winding device as described in claim 5, characterized in that, The first positioning part is a first side baffle extending parallel to the opposite side walls of the first storage groove on both sides of one side of the first pressing seat toward the bottom wall of the first storage groove. The first reset spring is a first torsion spring correspondingly sleeved on the middle section of the first pivot and located between the two first side baffles. The two torsion arms of the first torsion spring respectively press against the bottom wall of the first storage groove and the first pressing seat.
7. The curtain cord winding device as described in claim 4, characterized in that, The transmission rod is provided with a second receiving groove on the side away from the ratchet. The middle section of the second pivot is placed in the second receiving groove, and the opposite ends of the second receiving groove pass through the opposite side walls of the second receiving groove for pivoting into the corresponding second pivot holes on the base. The middle section of the second pivot is also pivotally connected to a second pressing seat. The opposite ends of the second return spring press against the bottom wall of the second receiving groove and the second pressing seat, respectively. The second pressing seat is also formed with a second positioning part that limits the position of the second return spring.
8. The curtain cord winding device as described in claim 7, characterized in that, The second positioning part is a second side baffle extending parallel to the opposite side walls of the second storage groove on one side of the second pressing seat toward the bottom wall of the second storage groove. The second return spring is a second torsion spring correspondingly sleeved on the middle section of the second pivot and located between the two second side baffles. The two torsion arms of the second torsion spring respectively press against the bottom wall of the second storage groove and the second pressing seat.
9. The curtain cord winding device as described in claim 1, characterized in that, The pressing component is provided with a rope groove for the carrying rope to pass through in a directional manner. One side of the rope groove is provided with an opening for the carrying rope to be inserted into the rope groove. The top of the groove sidewalls on both sides of the opening protrudes in opposite directions to form blocks to prevent the carrying rope from slipping out of the rope groove. The opposite ends of the rope groove are also provided with end openings that communicate with the opening and allow the carrying rope to slide in and out of the rope groove. The bottom wall of the rope groove is provided with a guide rod with a smooth outer side wall for the carrying rope to press against.
10. A curtain, comprising a top beam, two rope winding devices assembled on the top beam at a predetermined interval, a curtain body disposed below the top beam and connected to the rope winding devices, and a power device for synchronously driving the two rope winding devices to lift the curtain body, characterized in that, The cord winding device is the curtain cord winding device as described in any one of claims 1-9.