Pulling-rope-free curtain and retracting and releasing mechanism thereof

Abstract

The utility model discloses a curtain without a pull rope and a retracting and releasing mechanism thereof. The retracting and releasing mechanism comprises two rotating wheels which are in meshed transmission, a resistance module and a retracting elastic piece. Each rotating wheel is provided with a bottom wheel part and a transmission wheel part which are coaxially connected up and down. And the bottom wheel part of one rotating wheel can be used for winding or releasing the traction rope. The resistance module comprises three external gears which can rotate relative to the shell and are meshed with the bottom wheel parts of the corresponding rotating wheels. And the furling elastic sheet is elastically furled outside the transmission wheel part. By means of the structural design that the resistance module of the retracting and releasing mechanism can apply static friction force which hinders rotation between one rotating wheel and the shell, when a large error exists in the counter weight design of the pull-rope-free type curtain, the blind unit can still be stopped at any time, and the defect that due to the fact that an existing pull-rope-free type curtain is prone to being damaged due to improper counter weight design can be really overcome. Therefore, the problem that the blind unit cannot stop at any time is solved.

Description

Technical Field

[0001] The utility model relates to a curtain, in particular to a cordless curtain and its retracting and extending mechanism. Background Art

[0002] The cordless curtain of the louver type generally includes a top rod, a shading unit disposed below the top rod and composed of a plurality of window leaves arranged up and down, a counterweight located below the shading unit, a set of traction ropes extending up and down and connecting the window leaves and the counterweight and extending to the top rod, and a retracting and extending module disposed on the top rod and connected to the traction ropes. The retracting and extending module generally includes a first runner for winding the traction ropes, a second runner for driving the rotation of the first runner, an idler wheel, and a winding elastic sheet wound around the second runner and the idler wheel at its two ends respectively. The winding elastic sheet always has an elastic force for driving the second runner to drive the first runner to wind the traction ropes. The counterweight is set with a weight matching according to the elastic force, so that the shading unit can be pushed up and down and stopped accordingly.

[0003] However, in order to accurately position the shading unit at the position where the pushing and pulling stops, it is necessary to accurately configure the counterweight of the counterweight according to the weight of the shading unit and the winding elastic force of the winding elastic sheet, with a small allowable error. Once the counterweight error of the counterweight is slightly large, it is easy to occur that after the shading unit is stopped from being pushed up or pulled down, the retracting and extending module cannot immediately stop the shading unit. Summary of the Invention

[0004] The purpose of the utility model is to provide a retracting and extending mechanism for a cordless curtain that can improve at least one shortcoming of the prior art.

[0005] The retracting and extending mechanism for a cordless curtain of the utility model is suitable for being installed in pairs on the top rod of the cordless curtain, and can be used to respectively wind and unwind two traction ropes of the cordless curtain.

[0006] The retracting and extending mechanism includes a housing for being fixed on the top rod and having two spaced parallel upright shaft rods, two runners rotatably sleeved outside the shaft rods respectively, a resistance module sleeved outside one of the shaft rods, and a winding elastic sheet wound around the runners.

[0007] Each runner has a bottom wheel portion, a transmission wheel portion, and a tooth ring portion that are coaxially connected up and down. The tooth ring portions of the runners are engaged with each other. The bottom wheel portion of one of the runners can be driven to wind or release the corresponding traction rope.

[0008] The resistance module includes a rotating chassis rotatably sleeved outside the corresponding shaft rod, and three external gears pivotally and axially arranged up and down relative to the rotating chassis. The external gears are engaged with the inner circumferential side of the bottom wheel part of the corresponding runner.

[0009] Both ends of the retractable spring piece are elastically retracted outside the transmission wheel part of the runner respectively. When the retractable spring piece performs release and retraction actions between the transmission wheel parts, it drives the meshed runners to rotate synchronously, and the retractable spring piece always has a retraction elastic force elastically retracting towards the runner that is not used to retract the traction rope.

[0010] For the retracting and extending mechanism of the cordless curtain according to the present invention, the resistance module further includes a central gear that is non-rotatably sleeved and fixed outside the corresponding shaft rod and is engaged between the external gears.

[0011] For the retracting and extending mechanism of the cordless curtain according to the present invention, the resistance module further includes a rotating top plate rotatably sleeved outside the corresponding shaft rod and located above the rotating chassis. The external gears are pivotally arranged rotatably between the rotating chassis and the rotating top plate, and the central gear is located between the rotating chassis and the rotating top plate.

[0012] For the retracting and extending mechanism of the cordless curtain according to the present invention, the bottom wheel part engaged with the resistance module has an engaging ring wall that is sleeved and engaged with the external gears, and a limiting top wall that is arranged on the top side of the engaging ring wall and limits the rotating top plate on the external gears.

[0013] For the retracting and extending mechanism of the cordless curtain according to the present invention, the resistance module further includes a rotating top plate rotatably sleeved outside the corresponding shaft rod and spaced above the rotating chassis. The external gears are pivotally arranged rotatably between the rotating chassis and the rotating top plate.

[0014] The purpose of the present invention is to provide a cordless curtain that can improve at least one shortcoming of the prior art.

[0015] The cordless curtain of the present invention includes a curtain mechanism and two retracting and extending mechanisms as described above. The curtain mechanism includes a horizontally extending top rod, a curtain covering unit arranged below the top rod, a counterweight located at the bottom end of the curtain covering unit, and two traction ropes that are spaced left and right, extend up and down, connect between the counterweight and the curtain covering unit, and extend and are arranged in the top rod. The retracting and extending mechanisms are arranged left and right on the top rod and are respectively connected to the traction ropes, and the retraction elastic force of the retractable spring piece matches the gravity of the counterweight.

[0016] The cordless curtain of the present utility model, wherein the curtain unit has a plurality of window panels extending horizontally and arranged vertically and spaced apart below the top rod, and each traction cord extends vertically and is connected to the window panel.

[0017] The cordless curtain of the present utility model, wherein the curtain unit has a curtain cloth extending vertically and capable of flexible deformation, and the curtain cloth has a plurality of connecting parts arranged vertically and spaced apart in two rows on the left and right, and each traction cord extends vertically and is connected to the connecting parts arranged in a row vertically.

[0018] The beneficial effect of the present utility model is that: through the structural design of the retracting and deploying mechanism, the resistance module applies a static frictional force that hinders rotation between one of the rotating wheels and the housing. When there is a slightly large error in the weight design of the counterweight, the curtain unit can still be stopped at the position where the pushing and pulling stops, which can effectively improve the problem that the existing cordless curtain is prone to the curtain unit not being able to stop due to improper weight design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features and effects of the present utility model will be clearly presented in the embodiments with reference to the drawings, wherein:

[0020] Figure 1 is a front view showing the structure of a first embodiment of the cordless curtain of the present utility model;

[0021] Figure 2 is an incomplete exploded perspective view showing the structure of a retracting and deploying mechanism of the first embodiment;

[0022] Figure 3 is an incomplete exploded perspective view showing the structure of the retracting and deploying mechanism of the first embodiment, with a top seat omitted in the figure;

[0023] Figure 4 is an incomplete top cross-sectional view showing the structure of the retracting and deploying mechanism of the first embodiment;

[0024] Figure 5 is an incomplete side cross-sectional view showing the structure of the retracting and deploying mechanism of the first embodiment; and

[0025] Figure 6 is an incomplete front view showing the structure of a second embodiment of the cordless curtain of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Before the present utility model is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals.

[0027] Refer to Figure 1, a first embodiment of the cordless curtain 200 of the present utility model includes a curtain mechanism 3 for fixing on a wall surface and capable of being retracted and deployed up and down, and two retracting and deploying mechanisms 4 arranged left and right and installed on the curtain mechanism 3 for controlling the retraction and deployment of the curtain mechanism 3.

[0028] The curtain mechanism 3 is of the type of a venetian blind, including a top rod 31 for fixing on the wall surface, a shading unit 32 arranged below the top rod 31, a counterweight 33 extending left and right and arranged at the bottom end of the shading unit 32, and two traction ropes 34 spaced left and right, extending up and down, connecting the counterweight 33 and the shading unit 32, and extending upward to the top rod 31.

[0029] The shading unit 32 has a plurality of window leaves 321 extending left and right and arranged up and down. The traction ropes 34 extend up and down to connect to the window leaves 321, pass upward through the left and right end portions of the top rod 31, and then extend toward each other left and right and are respectively connected to the retracting and deploying mechanisms 4.

[0030] Since the curtain mechanism 3 is an existing component and there are many types, and it is not the key point of improvement of the present utility model, it will not be described in detail herein.

[0031] Refer to Figure 2 , 3 , 4, 5. Since the structures of the retracting and deploying mechanisms 4 are the same, for the convenience of description, only the structure and operation mode of one of the retracting and deploying mechanisms 4 will be described below.

[0032] The retracting and deploying mechanism 4 includes a housing 41 installed and fixed on the top rod 31, two rotatable wheels 42 pivotally arranged at intervals in the housing 41, a resistance module 43 arranged between the housing 41 and one of the wheels 42, and a retractable spring piece 44 arranged between the wheels 42, and one of the wheels 42 is connected to the corresponding traction rope 34.

[0033] The housing 41 includes a base 411 and a top seat 412 assembled up and down, and two shaft rods 413 protruding upward from the base 411 and inserted into the top seat 412.

[0034] The wheels 42 are rotatably sleeved outside the shaft rods 413 respectively. Each wheel 42 has a bottom wheel portion 421, a transmission wheel portion 425, and a toothed ring portion 426 connected coaxially up and down. The toothed ring portion 426 is between the bottom wheel portion 421 and the transmission wheel portion 425, and a tooth structure is provided on its outer peripheral edge. The wheels 42 are meshed with each other by the toothed ring portions 426 and can be driven to rotate relative to each other.

[0035] One of the runners 42 is connected to the corresponding towing rope 34 by the bottom wheel portion 421 and can be driven to rotate to wind or release the towing rope 34. One of the runners 42 covers the resistance module 43 with the bottom wheel portion 421. The bottom wheel portion 421 covering the resistance module 43 has an engaging ring wall 422 sleeved outside the resistance module 43 and a limiting top wall 424 provided on the top side of the engaging ring wall 422 and above the resistance module 43. A tooth structure 423 for meshing and driving with the resistance module 43 is provided on the inner peripheral surface of the engaging ring wall 422. The limiting top wall 424 can be used to limit the axial displacement of the resistance module 43.

[0036] The resistance module 43 is sleeved outside the corresponding shaft 413 and is located in the bottom wheel portion 421 of the corresponding runner 42. The resistance module 43 includes a rotating chassis 431 and a rotating top plate 432 that are rotatably sleeved up and down at intervals outside the shaft 413, three outer gears 434 distributed along the circumference of the shaft 413 and rotatably pivoted between the rotating chassis 431 and the rotating top plate 432, and a central gear 433 that is non-rotatably sleeved and fixed outside the shaft 413 and between the rotating chassis 431 and the rotating top plate 432. The central gear 433 meshes with the outer gears 434, and the outer gears 434 mesh with the engaging ring wall 422 of the bottom wheel portion 421. The rotating top plate 432 is axially limited on the outer gears 434 by the limiting top wall 424 of the bottom wheel portion 421.

[0037] The resistance module 43 can provide a static friction force between the corresponding runner 42 and the shaft 413 through the structural design of the central gear 433 fixed to the corresponding shaft 413 and the outer gears 434 meshing between the central gear 433 and the corresponding bottom wheel portion 421.

[0038] The retractable spring piece 44 has its two opposite ends respectively fixed to the transmission wheel portion 425 of the runner 42 and can be elastically retracted and released by the transmission wheel portion 425. The retractable spring piece 44 always has a retracting elastic force that elastically retracts towards the transmission wheel portion 425 of the runner 42 that does not wind the towing rope 34, and the retracting elastic force is much greater than the static friction force. The sum of the retracting elastic forces of the retractable spring piece 44 matches the gravity of the counterweight 33.

[0039] Refer to Figure 1 、 2, 4, when the cordless curtain 200 of the present utility model is in use, the up-and-down movement of the counterweight 33 or any one of the window panels 321 can be used to drive the retracting and deploying mechanism 4 to act via the traction cord 34 respectively, so as to adjust the up-and-down deployment range of the curtain unit 32. Hereinafter, only the action of one of the connected traction cords 34 and the retracting and deploying mechanism 4 will be taken as an example for illustration.

[0040] When pulling down the counterweight 33 or one of the window panels 321 and pulling down the traction cord 34, the traction cord 34 will drive the synchronous rotation of the runner 42 of the retracting and deploying mechanism 4, so that the runner 42 around which the traction cord 34 is wound will synchronously release the traction cord 34 and wind up the winding spring piece 44, and the other runner 42 will gradually release the winding spring piece 44.

[0041] When stopping pulling down the counterweight 33 or the window panel 321, under the matching of the gravity of the counterweight 33 and the winding elastic force of the winding spring piece 44, and the static friction force applied by the resistance module 43 between the corresponding runner 42 and the housing 41, the runners 42 of the retracting and deploying mechanism 4 will immediately stop, and the window panel 321 will stop at the position where the counterweight 33 is stopped from being pulled down.

[0042] On the contrary, when pushing up the counterweight 33 or any one of the window panels 321 to offset the gravity of the counterweight 33, the winding elastic force of the winding spring piece 44 of the retracting and deploying mechanism 4 will immediately drive it to wind up in the direction of the runner 42 that has not wound up the traction cord 34, thereby synchronously driving the rotation of the runner 42, so that the runner 42 around which the traction cord 34 is wound will synchronously release the winding spring piece 44 and wind up the traction cord 34 upward.

[0043] When stopping pushing up the counterweight 33 or the window panel 321, under the matching of the gravity of the counterweight 33 and the winding elastic force of the winding spring piece 44, and the static friction force of the resistance module 43, the runners 42 of the retracting and deploying mechanism 4 will immediately stop, and the window panel 321 will stop at the position where the counterweight 33 is stopped from being pushed up.

[0044] Therefore, through the structural design of setting the resistance module 43 between one of the runners 42 and the housing 41, the static friction force between the housing 41 and the resistance module 43 will become the resistance when the runner 42 rotates. Therefore, when there is a slightly large error in the weight design of the counterweight 33, the curtain unit 32 can still stop at the position where the pushing and pulling is stopped.

[0045] Refer to Figure 6 , the difference between a second embodiment of the cordless curtain 200 of the present utility model and the first embodiment lies in: the structural design of the curtain unit 32. For the convenience of description, only the differences of the embodiments will be described hereinafter.

[0046] In this second embodiment, the curtain mechanism 3 is of the Roman blind type. The curtain unit 32 includes a curtain fabric 322 that extends vertically and is flexibly deformable. The curtain fabric 322 has a plurality of connecting portions 323 arranged at intervals vertically and in two rows left and right. Each pulling rope 34 extends vertically and is connected to the connecting portions 323 of the corresponding row. The pulling rope 34 can be used to pull up the connecting portions 323 at different heights of the curtain fabric 322. When the pulling rope 34 is wound up by the winding and unwinding mechanism 4, it can be used to gradually fold up the curtain fabric 322 section by section from bottom to top. When the pulling rope 34 is gradually released downward by the winding and unwinding mechanism 4, it can be used to gradually release different sections of the curtain fabric 322 from top to bottom.

[0047] Since the operation mode of the winding and unwinding mechanism 4 is the same as that of the first embodiment, it will not be described again.

[0048] It should be noted that in the above two embodiments, it is not necessary to provide the central gear 433 for the resistance module 43. By using the static friction force between the external gear 434 and the engaged runner 42, it can also be used to overcome the problem of slightly larger errors in the counterweight design, so that the curtain unit 32 can stop at the position where the pushing and pulling stops.

[0049] In addition, during implementation, in other embodiments of the present invention, the winding and unwinding mechanisms 4 can be assembled together, that is, the housings 41 can be assembled together.

[0050] In summary, through the structural design of the housing 41, the runner 42 and the resistance module 43 of each winding and unwinding mechanism 4, the resistance module 43 applies a static friction force between one of the runners 42 and the housing 41, which will prevent the runner 42 from rotating relative to the housing 41. Therefore, when there are slightly larger errors in the counterweight design of the counterweight member 33, the curtain unit 32 can still stop at the position where the pushing and pulling stops, which can effectively improve the problem that the existing cordless curtain 200 is prone to the problem that the curtain unit 32 cannot stop due to improper counterweight design. Therefore, the cordless curtain 200 of the present invention is indeed a quite innovative, convenient and practical creation, and can indeed achieve the purpose of the present invention.

[0051] The above are only the embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. All simple equivalent changes and modifications made according to the claims and the content of the specification of the present invention still belong to the scope of the present invention.

Claims

1. A retracting and extending mechanism for a cordless curtain, which is suitable for being installed in pairs on the top rod of the cordless curtain and can be used to respectively wind and unwind two traction ropes of the cordless curtain. The retracting and extending mechanism includes a housing for being fixed on the top rod and having two upright shaft rods spaced parallel to each other, two rotatable runners respectively sleeved outside the shaft rods, and retracting elastic pieces elastically wound around the runners at their two end portions. Each runner has a bottom wheel portion, a transmission wheel portion, and a toothed ring portion coaxially connected up and down. The toothed ring portions of the runners are engaged with each other. The bottom wheel portion of one of the runners can be driven to rotate to wind or release the corresponding traction rope. The retracting elastic pieces are elastically wound outside the transmission wheel portions. When the retracting elastic pieces respectively perform release and winding actions between the transmission wheel portions, they will drive the engaged runners to rotate synchronously, and the retracting elastic pieces always have a retracting elastic force elastically wound in the direction of the runner not used for winding the traction rope. It is characterized in that: The retracting and extending mechanism further includes a resistance module. The resistance module is sleeved outside one of the shaft rods and includes a rotating chassis rotatably sleeved outside the corresponding shaft rod, and three outer gears axially pivotally mounted on the rotating chassis in a relatively rotatable manner in the up-and-down direction. The outer gears are engaged with the inner circumferential side of the bottom wheel portion of the corresponding runner.

2. The retracting and extending mechanism of the cordless curtain according to claim 1, wherein: The resistance module further includes a central gear fixedly sleeved outside the corresponding shaft rod in a non-rotatable manner and engaged between the outer gears.

3. The retracting and extending mechanism of the cordless curtain according to claim 2, characterized in that: The resistance module further includes a rotating top plate rotatably sleeved outside the corresponding shaft rod and located above the rotating chassis. The outer gears are pivotally mounted between the rotating chassis and the rotating top plate in a rotatable manner, and the central gear is located between the rotating chassis and the rotating top plate.

4. The retracting and extending mechanism of the cordless curtain according to claim 3, characterized in that: The bottom wheel portion engaged with the resistance module has an engaging ring wall sleeved and engaged with the outer gears, and a limiting top wall provided on the top side of the engaging ring wall to limit the rotating top plate on the outer gears.

5. The retracting and extending mechanism of the cordless curtain according to claim 1, characterized in that: The resistance module further includes a rotating top plate rotatably sleeved outside the corresponding shaft rod and spaced above the rotating chassis. The outer gears are pivotally mounted between the rotating chassis and the rotating top plate in a rotatable manner.

6. The retracting and extending mechanism of the cordless curtain according to claim 5, characterized in that: The bottom wheel portion engaged with the resistance module has an engaging ring wall sleeved and engaged with the outer gears, and a limiting top wall provided on the top side of the engaging ring wall to limit the rotating top plate on the outer gears.

7. A cordless curtain, comprising a curtain mechanism, the curtain mechanism including a horizontally extending top rod, a curtain covering unit disposed below the top rod, a counterweight member located at the bottom end of the curtain covering unit, and two traction ropes that are spaced left and right and extend vertically and are connected between the counterweight member and the curtain covering unit and extend and are disposed in the top rod; characterized in that: The cordless curtain further includes two retracting and extending mechanisms as described in any one of claims 1 to 6. The retracting and extending mechanisms are arranged side by side on the top rod and are respectively connected to the traction ropes. The retracting elastic force of the retracting spring piece matches the gravity of the counterweight.

8. The cordless curtain according to claim 7, wherein: The curtain unit has a plurality of window leaves extending horizontally and arranged at intervals in the up-and-down direction below the top rod. Each traction rope extends vertically and is connected to the window leaf.

9. The cordless curtain according to claim 7, wherein: The curtain unit has a curtain cloth extending vertically and capable of flexible deformation. The curtain cloth has a plurality of connecting portions arranged in two rows on the left and right at intervals in the up-and-down direction. Each traction rope extends vertically and is connected to the connecting portions arranged in a row in the up-and-down direction.

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