Curtain and rope winding device thereof
By using a planar spiral spring driver and a return spring design in the curtain cord winding device, the problem of unstable pawl return is solved, achieving a compact layout of the cord winding device and stable curtain descent, thus improving the curtain's performance.
Patent Information
- Application Number
- CN202423198383.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In existing curtain cord winding devices, the pawls rely on their own weight to return to their unstable position, which leads to the curtain becoming unbalanced and falling, and the layout of the cord winding device components is inflexible. It is also prone to problems such as the carrying cord becoming loose, tangled, or snagged.
The design employs a planar spiral spring driver and a return spring, which ensures that the pawl and ratchet remain engaged through elastic thrust, avoiding reliance on the weight of the pawl. This enhances the spatial layout of the rope winding device and allows for quick repositioning and engagement of the ratchet when the curtain is tilted, preventing the drive shaft from rotating.
The internal structure of the rope winding device is compact, reducing its size, preventing the curtain from falling unbalancedly, and improving the stability and lifespan of the curtain.
Smart Images
Figure CN223634601U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to the technical field of curtain fittings, and particularly relates to a curtain and a rope winding device thereof. BACKGROUND
[0002] A curtain comprises an upper beam, two curtain rope winding devices assembled on the upper beam at a predetermined interval, and a curtain body arranged below the upper beam and connected with the curtain rope winding devices. The curtain rope winding device further comprises a base, a winding drum pivotally arranged on the base, a power device connected with the winding drum through a transmission shaft, and a bearing rope wound on the winding drum, wherein the outer end of the bearing rope is connected with the curtain body after being led out from the winding drum; and a brake assembly assembled on the base. The brake assembly comprises a ratchet wheel fixed coaxially with the transmission shaft, and a pawl pivotally arranged on the base and used for unidirectionally locking the ratchet wheel. The bearing rope is wound around one end of the pawl after being led out from the winding drum and then connected with the curtain body. When the curtain body is pulled down, the bearing rope is taut and exerts a pressing force on the pawl, so that the pawl rotates and is separated from the ratchet wheel, the winding drum can rotate to release the bearing rope, and the curtain body can continuously descend. When the bearing rope is relaxed, the pawl is not pressed by the bearing rope and is reset to the position of being engaged with the ratchet wheel under the gravity, so that the winding drum can only rotate in one direction to wind the bearing rope. Since the two curtain rope winding devices are usually arranged at the two ends of the upper beam corresponding to the width direction of the curtain body, if the curtain body is in an unbalanced state with one end being higher than the other end during the process of pulling down the curtain body, the bearing rope corresponding to the relatively higher end is relaxed, and the brake assembly in the corresponding curtain rope winding device is engaged with the ratchet wheel, so that the transmission shaft cannot rotate and the winding drum cannot release the bearing rope, thereby preventing the curtain body from continuously descending.
[0003] The inventor finds in the specific implementation that the pawl in the brake assembly is reset by the gravity, which has strict limitations on the position of the pawl and is not conducive to the layout design of the components of the rope winding device. In addition, when the bearing rope on one side is relaxed during the process of pulling down the curtain body, the corresponding pawl may not be reset in time, which not only causes the curtain body to be pulled down in the unbalanced state, but also easily causes the relaxed bearing rope to be abnormally wound or hooked, thereby affecting the normal use of the curtain. UTILITY MODEL CONTENT
[0004] The technical problem to be solved by the embodiment of the utility model is to provide a curtain rope winding device which can facilitate the layout design of components and promote the rapid reset of the pawl.
[0005] The further technical problem to be solved by the embodiment of the utility model is to provide a curtain which can facilitate the rapid reset of the pawl of the rope winding device and effectively prevent the curtain body from being pulled down in an unbalanced state.
[0006] To solve the above technical problems, the utility model discloses the following technical scheme: a curtain winding device, comprising:
[0007] The base is assembled on the upper beam of the curtain.
[0008] The winding drum is pivoted on the base.
[0009] The planar scroll spring driver is drivenly connected with the winding drum through a transmission shaft.
[0010] The load rope is wound on the winding drum at the inner end and is connected to the curtain body at the outer end.
[0011] The brake assembly is assembled on the base, and the brake assembly comprises:
[0012] The ratchet wheel is coaxially fixed with the transmission shaft.
[0013] The pawl is pivoted on the base through a first pivot and is used for controlling the one-way rotation of the ratchet wheel, and the pawl comprises a clamping part for clamping the ratchet teeth of the ratchet wheel and a pressing part for allowing the load rope to be pressed thereon.
[0014] The first return spring is assembled on the base and is used for applying an elastic pushing force to the clamping part to keep the clamping part clamped with the ratchet teeth.
[0015] When the outer end of the load rope is connected to the curtain body after the pressing part and the load rope is tight under tension, the pressing part is pressed to make the clamping part rotate to a position away from the ratchet teeth against the elastic pushing force.
[0016] Further, the clamping part and the pressing part are two separate components manufactured separately, one end of the clamping part is formed with a clamping pawl for clamping the ratchet teeth, and the other end is pivoted on the base through the first pivot, the pressing part comprises a transmission rod pivoted on the base through a second pivot and comprising a control end and a driving end at opposite ends, the load rope is pressed on the control end, and the driving end abuts against one end of the clamping part formed with the clamping pawl, and when the load rope is tight, the control end is pressed to make the pressing part rotate, and the driving end pushes the clamping part to make the clamping pawl away from the ratchet teeth.
[0017] Further, one end of the clamping part formed with the clamping pawl is also formed with a plug hole, and the end of the driving end is correspondingly formed with a pushing block movably inserted into the plug hole and abutting against the inner wall of the plug hole away from the ratchet wheel.
[0018] Further, the pressing component further comprises a second reset spring for pushing the transmission rod to rotate to a position for facilitating the engagement of the pawl with the ratchet.
[0019] Further, the side of the pawl away from the ratchet wheel is provided with a first receiving groove, the middle section of the first pivot shaft is arranged in the first receiving groove, opposite ends of the middle section of the first pivot shaft penetrate through opposite side walls of the first receiving groove for being pivotally connected in corresponding first pivot connection holes arranged on the base, the middle section of the first pivot shaft is further pivotally connected with a first pressing seat, opposite ends of the first reset spring are respectively pressed on a groove bottom wall of the first receiving groove and the first pressing seat, the first pressing seat is further formed with a first positioning part for limiting the position of the first reset spring.
[0020] Further, the first positioning part is first side plates extending from opposite sides of the first pressing seat towards a side face of the groove bottom wall of the first receiving groove in parallel with the opposite side groove side walls of the first receiving groove, the first reset spring is a first torsion spring correspondingly sleeved on the middle section of the first pivot shaft and located between the two first side plates, two torsion arms of the first torsion spring are respectively correspondingly pressed on the groove bottom wall of the first receiving groove and the first pressing seat.
[0021] Further, the side of the transmission rod away from the ratchet wheel is provided with a second receiving groove, the middle section of the second pivot shaft is arranged in the second receiving groove, opposite ends of the middle section of the second pivot shaft penetrate through opposite side walls of the second receiving groove for being pivotally connected in corresponding second pivot connection holes arranged on the base, the middle section of the second pivot shaft is further pivotally connected with a second pressing seat, opposite ends of the second reset spring are respectively pressed on a groove bottom wall of the second receiving groove and the second pressing seat, the second pressing seat is further formed with a second positioning part for limiting the position of the second reset spring.
[0022] Further, the second positioning part is second side plates extending from opposite sides of the second pressing seat towards a side face of the groove bottom wall of the second receiving groove in parallel with the opposite side groove side walls of the second receiving groove, the second reset spring is a second torsion spring correspondingly sleeved on the middle section of the second pivot shaft and located between the two second side plates, two torsion arms of the second torsion spring are respectively correspondingly pressed on the groove bottom wall of the second receiving groove and the second pressing seat.
[0023] Further, the pressing component is provided with a rope groove through which the load bearing rope is directed to pass, one side of the rope groove is provided with a notch through which the load bearing rope is loaded into the rope groove, the top of the groove side wall on both sides of the notch is staggered towards the opposite protrusion and is formed with a stopper for preventing the load bearing rope from sliding out of the rope groove, the opposite ends of the rope groove are further provided with end openings which are communicated with the notch and through which the load bearing rope is slid in and out of the rope groove, and the groove bottom wall of the rope groove is provided with a guide rod with a smooth outer wall for pressing the load bearing rope.
[0024] In another aspect, in order to solve the above further technical problems, the utility model discloses the following technical scheme: a curtain, comprising an upper beam, two curtain rope winding devices assembled on the upper beam at a predetermined interval and a curtain body arranged below the upper beam and connected with the curtain rope winding device, the curtain rope winding device is the curtain rope winding device of any one of the above, and the two winding devices share one planar spiral spring driver.
[0025] After the above technical scheme is adopted, the utility model has at least the following beneficial effects: the utility model discloses that the first reset spring is additionally arranged on the base to always elastically press the claw part of the brake assembly, can always push the claw part to make it keep clamping with the ratchet tooth of the ratchet wheel, does not rely on the gravity of the pawl to keep clamping with the ratchet tooth, can more flexibly design the position of the pawl, is favorable for the space layout design of various components in the rope winding device, makes the internal structure of the rope winding device more compact, and reduces the volume of the whole rope winding device. When being applied to the curtain, one winding device is arranged at each end of the upper beam to connect the curtain body. During the process of pulling down the curtain body, once the curtain body is inclined, the load bearing rope of the winding device corresponding to the higher end of the curtain body will be relaxed. The elastic pushing force of the corresponding first reset spring can ensure that the claw part quickly resets and clamps with the ratchet tooth of the ratchet wheel again, thereby preventing the rotation of the transmission shaft coaxially connected with the ratchet wheel, and the curtain body cannot be continuously pulled down, thereby avoiding the unbalanced descent of the curtain body. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 It is a split structure schematic view of an optional embodiment of the utility model curtain.
[0027] Figure 2 It is a split structure schematic view of an optional embodiment of the utility model curtain rope winding device installed on the base part.
[0028] Figure 3 It is a split structure schematic view of the brake assembly of an optional embodiment of the utility model curtain rope winding device.
[0029] Figure 4This is a cross-sectional structural diagram of the braking component of an optional embodiment of the curtain rope winding device of this utility model, showing the engagement of the pawl part of the braking assembly with a ratchet tooth of the ratchet.
[0030] Figure 5 This is a cross-sectional structural diagram of the braking component of an optional embodiment of the curtain rope winding device of this utility model when the pawl part is separated from a ratchet tooth of the ratchet.
[0031] Figure 6 This is a schematic diagram of the disassembled structure of the base portion of another optional embodiment of the curtain rope winding device of this utility model.
[0032] Figure 7 This is a schematic diagram showing the disassembled structure of the braking component, which is another optional embodiment of the curtain rope-winding device of this utility model.
[0033] Figure 8 This is a cross-sectional structural diagram of the brake assembly when the pawl component of the brake assembly engages with a ratchet tooth of the ratchet, which is another optional embodiment of the curtain rope winding device of this utility model.
[0034] Figure 9 This is a cross-sectional structural diagram of the braking component when it is separated from one ratchet tooth of the ratchet, which is another optional embodiment of the curtain rope winding device of this utility model. Detailed Implementation
[0035] The present application will be further described in detail below 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 utility model and are not intended to limit the present utility model. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.
[0036] like Figures 1-9 As shown, an optional embodiment of this utility model provides a curtain cord winding device 1, comprising:
[0037] The base 10 is assembled on the upper beam 3 of the curtain;
[0038] A rope winding cylinder 11 is pivotally mounted on the base 10;
[0039] A planar spiral spring driver 12 is connected to the rope winding drum 11 via a drive shaft 121.
[0040] A carrying rope 13, with its inner end wound around the rope winding cylinder 11 and its outer end extending from the rope winding cylinder 11 and connected to the curtain body 5 of the curtain; and
[0041] Braking assembly 14 is assembled on the base 10, the braking assembly 14 comprising:
[0042] A ratchet 141 is fixed coaxially with the drive shaft 121;
[0043] A pawl 143 is pivoted on the base 10 by a first pivot 142 and used to control the one-way rotation of the ratchet wheel 141, the pawl 143 comprises a clamping component 1430 clamped with the ratchet teeth 1410 of the ratchet wheel 141 and a pressing component 1432 used for the bearing rope 13 to be oriented and pressed thereon; and
[0044] A first return spring 145 is assembled on the base 10 and used to apply an elastic pushing force to the clamping component 1430 so as to keep the clamping component 1430 clamped with the ratchet teeth 1410 of the ratchet wheel 141;
[0045] When the outer end of the bearing rope 13 is led out from the winding rope drum 11, passes through the pressing component 1432 and is connected to the curtain body, and the bearing rope 13 is tight under tension, the pressing force is applied to the pressing component 1432 to promote the clamping component 1430 to rotate to a position disengaged from the ratchet teeth 1410 against the elastic pushing force.
[0046] The embodiment of the utility model adds the first return spring 145 on the base 10 to always elastically press the clamping component 1430 of the brake assembly 14, can always push the clamping component 1430 to keep it clamped with the ratchet teeth 1410 of the ratchet wheel 141, and does not rely on the gravity of the pawl 143 to keep it clamped with the ratchet teeth 1410, thereby more flexible design of the position of the pawl 143, is favorable to the space layout design of each component in the winding rope device 1, makes the internal structure of the winding rope device 1 more compact, reduces the volume of the whole winding rope device 1. When applied to the window curtain, one winding rope device 1 is arranged at each end of the upper beam 3 to connect the curtain body, during the process of pulling down the curtain body 5, once the curtain body 5 is inclined, the bearing rope of the winding rope device 1 corresponding to the higher end of the curtain body 5 will be relaxed, the elastic pushing force of the corresponding first return spring 145 can ensure that the clamping component 1430 quickly returns to be clamped with the ratchet teeth 1410 of the ratchet wheel 141, thereby preventing the rotation of the transmission shaft 121 coaxially connected with the ratchet wheel 141, the curtain body 5 cannot continue to be pulled down, thereby avoiding the unbalanced descent of the curtain body 5.
[0047] In an optional embodiment of the utility model, as Figures 2-5As shown, the pawl component 1430 and the pressing component 1432 are two separately manufactured independent components. One end of the pawl component 1430 is formed with a pawl 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 opposite ends respectively constitute a control end 1434b and a drive end. The transmission rod 1434 of 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.
[0048] 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.
[0049] In one optional embodiment of this utility model, such as Figures 3-5 As shown, the pawl component 1430 has a pawl 1430a at one end, and an insertion hole 1430b is formed at the end of the drive end 1434c. The drive end 1434c is correspondingly formed with a push block 1434d that is movably inserted into the insertion hole 1430b and abuts against the inner wall of the insertion hole 1430b on the side 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 via 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.
[0050] In one optional embodiment of this utility model, such asFigures 3-5 As shown, the pressing component 1432 further comprises a second reset spring 1436 for pushing the transmission rod 1434 to rotate to a position for facilitating the clamping jaw 1430a to be clamped with the ratchet 1410. In this embodiment, the pressing component 1432 further comprises the second reset spring 1436, which can assist the first reset torsion spring 145 to realize the automatic reset of the transmission rod 1434.
[0051] In specific implementation, as shown in Figures 6-9 In the embodiment shown, the clamping jaw component 1430 and the pressing component 1432 are integrally formed and arranged on two sides of the first pivot 142, and one end of the clamping jaw component 1430 is formed with a clamping jaw 1430a for clamping with the ratchet 1410. The clamping jaw component 1430 and the pressing component 1432 are directly integrally formed, and the ratchet 143 can be directly integrally assembled to the base 10, and the assembly structure can be more simple.
[0052] In an optional embodiment of the utility model, as shown in Figures 3-5 、 Figures 7-9 As shown, the side of the ratchet 143 away from the ratchet wheel 141 is provided with a first receiving groove 143a, the middle section of the first pivot 142 is arranged in the first receiving groove 143a, and opposite two ends of the first receiving groove 143a are penetrated through opposite two side walls of the first receiving groove 143a for being pivoted in the first pivot hole 101a arranged on the base 10 (as shown in Figure 7 As shown, the middle section of the first pivot 142 is further pivoted with a first pressing seat 143b, opposite two ends of the first reset spring 145 are respectively pressed on the groove bottom wall of the first receiving groove 143a and the first pressing seat 143b, and the first pressing seat 143b is further formed with a first positioning part 143c for limiting the position of the first reset spring 145. In this embodiment, the first receiving groove 143a is arranged to receive the first reset spring 145, which can effectively reduce the occupied space, and the first reset spring 145 is abutted on the base 10 through the first pressing seat 143b, which facilitates the first reset spring 145 to stably release the elastic pushing force; and the first pressing seat 143b is further provided with the first positioning part 143c, which avoids the position deviation of the first reset spring 145 due to stress deformation in the extension and retraction process.
[0053] In an optional embodiment of the utility model, as shown in Figures 3-5 、 Figures 7-9As shown, 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 on the middle section of the first pivot 142, which not only enables the positioning of the first torsion spring by the first pivot 142, but also facilitates the smooth release of torsional force by the two torsion arms of the first torsion spring through torsion. In addition, the first positioning part 143c is 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.
[0054] In one optional embodiment of this utility model, such as Figures 3-5 As shown, the transmission rod 1434 has 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 the opposite side walls of the second receiving groove 1434e for pivoting into the corresponding second pivot hole 101b on the base 10 (e.g., Figure 3 As shown), a second pressing seat 1434f is also pivotally connected to the middle section of the second pivot 1434a. 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. A second positioning part 1434g is also formed on the second pressing seat 1434f to limit the position of the second return spring 1436. In this embodiment, by setting the second receiving groove 1434e to receive 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 the second positioning part 1434g to prevent the second return spring 1436 from being deformed by force and shifting position during the extension and contraction process.
[0055] In one optional embodiment of this utility model, such as Figures 3-5As shown, the second positioning part 1434g is a second side baffle extending from the second pressing seat 1434f to the opposite two sides of the side wall of the second receiving groove 1434e, the second reset spring 1436 is a second torsion spring corresponding to the middle segment of the second pivot 1434a and located between the two second side baffles 1434g, and the two torsion arms of the second torsion spring 1436 are respectively pressed on the groove bottom wall of the second receiving groove 1434e and the second pressing seat 1434f. In this embodiment, the second reset spring 1436 is a second torsion spring sleeved on the middle segment of the second pivot 1434a, which not only realizes the positioning of the second torsion spring by the second pivot 1434a, but also facilitates the smooth release of the torsion power of the two torsion arms of the second torsion spring by torsion. In addition, the second positioning part 1434g is a second side baffle extending from the second pressing seat 1434f, so that the torsion arm of the second torsion spring can be effectively limited on the second pressing seat 1434f.
[0056] In an optional embodiment of the utility model, as shown in Figures 3-5 、 Figures 7-9 As shown, the pressing part 1432 is provided with a rope groove 1438 for the directional passing of the bearing rope 13, one side of the rope groove 1438 is provided with a slot opening 1438a for the loading of the bearing rope 13 into the rope groove 1438, the top of the groove side wall on the two sides of the slot opening 1438a is staggered to the opposite protrusion and is formed with a stop block 1438b for preventing the bearing rope 13 from sliding out of the rope groove 1438, and the opposite two ends of the rope groove 1438 are also provided with end openings 1438c in communication with the slot opening 1438a and for the sliding in and out of the bearing rope 13 into and out of the rope groove 1438, and the groove bottom wall of the rope groove 1438 is provided with a guide rod 1438d with a smooth outer side wall for the pressing of the bearing rope 13. In this embodiment, the pressing part 1432 is also provided with the rope groove 1438, and in the specific assembly, the bearing rope 13 can be directly clamped into the rope groove 1438 from the slot opening 1438a of the rope groove 1438, which not only facilitates the assembly, but also prevents the bearing rope 13 from being separated from the pressing part 1432 of the pawl 143, thereby ensuring that the bearing rope 13 stably applies the pressing force when being tightened. Moreover, the guide rod 1438d is assembled in the rope groove 1438, and the bearing rope 13 abuts against the guide rod 1438d with a smooth outer side wall during the retraction and extension, thereby reducing the wear of the bearing rope 13 and prolonging the service life.
[0057] In the specific implementation, as Figures 2-9As shown, the base 10 comprises a mounting seat 101 for the winding drum 11 to be pivotally arranged thereon, and a brake box 103 fixedly assembled at one end of the mounting seat 101, the transmission shaft 121 passes through the mounting seat 101 and the brake box 103 in sequence, the brake assembly 14 is assembled in the brake box 103, and one end of the abutting part 1432 of the pawl 143 is exposed from an opening 1030 of one side wall of the brake box 103. In the embodiment, the base 10 comprises the mounting seat 101 and the brake box 103, the brake assembly 14 is accommodated in the brake box 103, and in the specific assembly, the brake box 103 assembled with the brake assembly 14 can be directly assembled at one end of the mounting seat 101, and then the bearing rope 13 can be wound around the abutting part 1432 exposed from one side wall of the brake box 103b, so that the assembly can be effectively and conveniently achieved, and the structural layout is optimized.
[0058] On the other hand, as Figure 1 As shown, the utility model embodiment further provides a window curtain, which comprises an upper beam 3, two window curtain winding devices 1 assembled on the upper beam 3 at a predetermined interval, and a curtain body 5 arranged below the upper beam 3 and connected with the window curtain winding devices 1, wherein the window curtain winding device is the window curtain winding device according to any one of the above-mentioned embodiments, and the two window curtain winding devices 1 share one planar spiral spring driver 12. In the embodiment, the window curtain adopts the winding device 1 provided by any one of the above-mentioned embodiments, and when the curtain body 5 is being pulled down, once the curtain body 5 is tilted, the bearing rope of the winding device 1 located at the higher end of the curtain body 5 will be loosened, and the elastic thrust of the corresponding first return spring 145 can ensure that the claw part 1430 is quickly returned to be re-connected with the ratchet teeth 1410 of the ratchet wheel 141, so as to prevent the rotation of the transmission shaft 121 coaxially connected with the ratchet wheel 141, and the curtain body 5 cannot be continuously pulled down, thereby avoiding the unbalanced descent of the curtain body 5.
[0059] In the specific implementation, although Figure 1 The window curtain shown in the figure is a shutter, but the window curtain provided by the utility model embodiment can also be applied to a honeycomb curtain and a Roman curtain, etc., which realize the lifting of the curtain body 5 through the bearing rope 13; and the planar spiral spring driver 12 can be assembled between the two window curtain winding devices 1, so as to facilitate the structural layout.
[0060] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative but not restrictive, and a person skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection scope of the utility model.
Claims
1. A curtain winding device, comprising: a base assembled on an upper beam of a curtain; a winding drum pivotally arranged on the base; a planar spiral spring driver in transmission connection with the winding drum through a transmission shaft; a load bearing rope having an inner end wound on the winding drum and an outer end drawn out of the winding drum and connected to a curtain body of the curtain; and a brake assembly assembled on the base, the brake assembly comprising a ratchet fixed coaxially with the transmission shaft and a pawl pivotally arranged on the base through a first pivot shaft and used for controlling one-way rotation of the ratchet, the pawl comprising a clamping part in clamping engagement with ratchet teeth of the ratchet and a pressing part used for allowing the load bearing rope to be pressed thereon, characterized in that the brake assembly further comprises: a first return spring assembled on the base and used for applying an elastic pushing force to the clamping part to keep the clamping part in clamping engagement with the ratchet teeth; when the outer end of the load bearing rope is drawn out of the winding drum and then wound on the pressing part before being connected to the curtain body and the load bearing rope is tight under tension, the pressing part is pressed to facilitate the clamping part to rotate to a position out of engagement with the ratchet teeth against the elastic pushing force.
2. The window shade cord winding device of claim 1, wherein, the clamping part and the pressing part are two separate members manufactured separately, one end of the clamping part is formed with a clamping jaw used for clamping engagement with the ratchet teeth, and the other end is pivotally arranged on the base through the first pivot shaft, the pressing part comprises a transmission rod having a middle segment pivotally connected to the base through a second pivot shaft and opposite ends forming a control end and a driving end respectively, the load bearing rope is pressed on the control end, and the driving end abuts against one end of the clamping part formed with the clamping jaw, and when the load bearing rope is tight, the control end is pressed to rotate the pressing part, and the driving end pushes the clamping part to make the clamping jaw out of engagement with the ratchet teeth.
3. The window shade cord winding device of claim 2, wherein, one end of the clamping part formed with the clamping jaw is further formed with a insertion hole, and a distal end of the driving end is correspondingly formed with a pushing block movably inserted into the insertion hole and abutting against an inner wall of the insertion hole away from the ratchet.
4. The window covering cord winding device of claim 2, wherein, the pressing part further comprises a second return spring used for pushing the transmission rod to rotate to a position facilitating the clamping jaw to be clamped with the ratchet teeth.
5. The window covering cord winding device of claim 1, wherein, a first receiving groove is arranged on a side of the pawl away from the ratchet, a middle segment of the first pivot shaft is arranged in the first receiving groove, opposite ends of the middle segment penetrate through opposite side walls of the first receiving groove to be pivotally connected to corresponding first pivot connection holes arranged on the base, the middle segment of the first pivot shaft is further pivotally connected with a first pressing seat, opposite ends of the first return spring are pressed on a groove bottom wall of the first receiving groove and the first pressing seat respectively, and the first pressing seat is further formed with a first positioning part limiting a position of the first return spring.
6. The window shade cord winding device of claim 5, wherein, The first positioning part is a first side baffle extending from the first pressing seat to the opposite sides of the side wall of the first receiving groove, the first reset spring is a first torsion spring corresponding to the middle segment of the first pivot and located between the two first side baffles, and the two torsion arms of the first torsion spring are respectively pressed on the bottom wall of the first receiving groove and the first pressing seat.
7. The window shade cord winding device of claim 4, wherein, The second pivot middle segment is located in the second receiving groove, penetrates the opposite side walls of the second receiving groove, and is pivoted in the corresponding second pivot hole of the base, the second pivot middle segment further pivots a second pressing seat, the opposite ends of the second reset spring are respectively pressed on the bottom wall of the second receiving groove and the second pressing seat, and the second pressing seat is further formed with a second positioning part for limiting the position of the second reset spring.
8. The window shade cord winding device of claim 7, wherein, The second positioning part is a second side baffle extending from the second pressing seat to the opposite sides of the side wall of the second receiving groove, the second reset spring is a second torsion spring corresponding to the middle segment of the second pivot and located between the two second side baffles, and the two torsion arms of the second torsion spring are respectively pressed on the bottom wall of the second receiving groove and the second pressing seat.
9. The window covering cord winding device of claim 1, wherein, The pressing part is provided with a rope groove for guiding the bearing rope to pass through, one side of the rope groove is provided with a slot for loading the bearing rope into the rope groove, the top of the side wall of the slot on the two sides is staggered to the opposite protrusions to form a stop block for preventing the bearing rope from sliding out of the rope groove, the opposite ends of the rope groove are further provided with end openings communicating with the slot and allowing the bearing rope to slide in and out of the rope groove, and the bottom wall of the rope groove is provided with a guide rod with a smooth outer wall for pressing the bearing rope.
10. A window shade comprising an upper rail, two cord winding devices assembled on the upper rail at a predetermined interval, and a shade body provided below the upper rail and connected to the cord winding devices, characterized in that, The rope winding device is the window curtain rope winding device according to any one of claims 1-9, and two rope winding devices share one planar spiral spring driver.