Three-rail curtain

Abstract

The utility model provides a three-rail curtain which comprises an upper rail, a middle rail and a lower rail, and a window shade is installed between the middle rail and the lower rail. A rope winding device is mounted in the lower track; and two ends of the stringing rope respectively penetrate through the upper track, the middle track, the window shade and the lower track in sequence and then are wound in the rope winding device. And at least one of the middle rail and the lower rail is a telescopic rail. The overall weight is small, punching is not needed during installation, installation is stable, operation is more convenient, and the shading effect is better. The window curtain is simple in structure and convenient to adjust and adapt to windows of various sizes, after the telescopic rail is arranged, the rail does not need to be cut when the size of the window curtain is adjusted, the overall mass change is small, the balance weight does not need to be adjusted again, and the whole adjusted window curtain is more attractive.

Description

Technical Field

[0001] The utility model relates to the technical field of curtains, in particular to a three-rail curtain. Background Art

[0002] The accordion curtain or honeycomb curtain belongs to the simple style of indoor decoration curtains, and its design is developed from the need for different light during day and night, which is a combined window decoration. It is widely used in: homes, schools, hotels, villas, offices, office buildings, entertainment places, etc.

[0003] However, the existing products have the following deficiencies:

[0004] 1. The traditional curtain is relatively heavy as a whole. After using for a period of time, the curtain body may have unstable limit. The too heavy curtain body will increase the downward force, resulting in the gradual weakening of the light-shielding effect over time. At the same time, problems such as curtain body skew and wrinkles may occur due to uneven gravity, seriously affecting the beauty and practicality.

[0005] 2. Since the window sizes in users' homes are different, when the curtain needs to be adapted and cut, if the operation is improper or the design is unreasonable, it is easy to damage the original structural beauty of the curtain and affect the final decorative effect.

[0006] 3. Due to the relatively heavy curtain as a whole, when installing, it is necessary to punch holes and then fix it to stably fix the curtain as a whole, which will cause permanent damage to the stress surfaces such as walls and ceilings, especially obvious on gypsum board walls or light partition walls, increasing the additional maintenance cost and potential safety hazards. Content of the Utility Model

[0007] The purpose of the utility model is to provide a three-rail curtain to overcome all or part of the above-mentioned deficiencies in the prior art.

[0008] To achieve the above purpose, the utility model provides the following technical solutions:

[0009] A three-rail curtain includes an upper rail, a middle rail, and a lower rail. A light-shielding curtain is installed between the middle rail and the lower rail; a rope collector that combines rope collection and counterweight is installed inside the lower rail; a rope is also included, and both ends of the rope sequentially pass through the upper rail, the middle rail, the light-shielding curtain, and the lower rail and then are wound on the rope collector.

[0010] By using the above technical solution, the rope collector is arranged inside the lower track, which has significant advantages compared to the prior art in which the rope collector is arranged in the upper track. First, the use of counterweights is eliminated, which means that the overall weight of the curtains can be reduced, which is beneficial to the stability of the curtains during hanging and movement, and avoids problems such as loosening of hangers or damage to walls due to excessive weight. Secondly, although there are similar metal track products on the market that are not equipped with counterweights, they may not run smoothly because they do not effectively balance the weight of the curtains. The present application optimizes the structural layout and uses the rope collector as a counterweight object. Even without relying on additional counterweights, it can ensure the smooth operation of the curtains, while reducing production costs and installation difficulties. It not only improves the overall performance of the curtains, but also reduces the manufacturing cost of the product, reflecting the dual innovation and optimization of both technology and economy.

[0011] Furthermore, a middle rail fabric groove is provided at the lower part of the middle rail, a lower rail fabric groove is provided at the upper part of the lower rail, and the upper and lower ends of the blackout curtain are respectively installed in the middle rail fabric groove and the lower rail fabric groove.

[0012] Furthermore, the lower rail also includes a rope collector installation groove arranged below the lower rail surface groove, and the rope collector is installed in the rope collector installation groove.

[0013] Furthermore, at least one of the middle track and the lower track is a telescopic track.

[0014] Furthermore, a shielding edge is extended downward from the outer edge of the upper surface of the upper rail, and when the middle rail moves into the upper rail, the shielding edge can shield the gap between the middle rail and the upper rail.

[0015] Furthermore, two ends of the threading rope respectively pass through the middle track and then cross each other, and then respectively pass through the blackout curtain.

[0016] Furthermore, the upper track can be fixedly connected to the wall by any one of solvent bonding, gluing, magnetic connection, mechanical fastening, Velcro connection or any combination of these connection methods; or by connecting the upper track to the retractable curtain and then fixing it next to the window.

[0017] Furthermore, both ends of the middle rail are respectively slidably connected with a middle rail telescopic kit, the lower part of the middle rail telescopic kit is provided with a middle rail fabric telescopic groove for the blackout curtain to pass through, and the upper part of the middle rail telescopic kit is provided with a fixed line telescopic groove along the sliding direction.

[0018] Furthermore, protective rings are provided in the rope threading holes of the upper rail, the middle rail and the lower rail.

[0019] Furthermore, a reserved hole is provided at the bottom of the rope collector installation slot corresponding to the rope threading hole of the lower track.

[0020] Furthermore, the lower rail also includes a detachable cover plate, which is arranged at the bottom of the rope collector installation slot. The bottom of the rope collector installation slot is provided with two opposite limit slots, and the two side edges of the cover plate are respectively inserted into the corresponding limit slots.

[0021] Furthermore, a cutting aid is also included, which includes a main body with a U-shaped cross-section, a stop block is vertically arranged in the main body, and a cutting groove is also arranged on the cutting aid, which runs through one side of the main body to the other side, and the cutting groove runs through the stop block.

[0022] A middle rail handle and a lower rail handle are respectively installed on the middle rail and the lower rail.

[0023] The middle rail handle and the lower rail handle are respectively detachably connected with a handle head, which can be conveniently stored after being detached from the handle, thereby reducing the packaging volume.

[0024] From the analysis, it can be known that the utility model discloses a three-track curtain, which realizes a small overall weight, does not require drilling during installation, is stable to install and is more convenient to operate, and has a better shading effect; it is convenient to adjust and adapt to windows of various sizes, and because the telescopic track is set, the track does not need to be cut when the curtain size is adjusted, the overall mass changes little, and there is no need to readjust the counterweight, and the adjusted curtain is more beautiful as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a three-track curtain;

[0027] Figure 2 It is a schematic diagram of the structure explosion of an embodiment of a three-track curtain;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of the structure at the circled position A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of a middle rail telescopic kit of an embodiment of a three-rail curtain;

[0030] Figure 5 This is a schematic diagram of a structure in which a reserved hole is provided at the bottom of the lower track of an embodiment of a three-track curtain;

[0031] Figure 6 It is a schematic diagram of the structure of the lower track with a detachable cover plate in one embodiment of a three-track curtain;

[0032] Figure 7 It is a schematic diagram of the structure of a cutting aid of an embodiment of a three-track curtain;

[0033] Explanation of the reference numerals: 1-upper rail; 11-Velcro; 100-horizontal rope groove; 101-shielding edge; 2-middle rail; 200-middle rail fabric groove; 21-middle rail telescopic kit; 210-middle rail fabric telescopic groove; 211-fixed line telescopic groove; 22-first end cap; 23-middle rail handle; 3-lower rail; 300-lower rail fabric groove; 301-rope collector installation groove; 302-lower rail rope threading hole; 303-reserved hole; 304-cover plate limiting groove; 305-cover plate; 31-lower rail telescopic kit; 310-lower rail fabric telescopic groove; 32-second end cap; 33-lower rail handle; 34-handle head; 4-shading curtain; 5-rope threading; 6-rope collector; 7-cutting aid; 70-body; 71-stop block; 72-cutting groove. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0035] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] One or more examples of the utility model are shown in the attached drawings. The detailed description uses numbers and letters to refer to the features in the drawings. Similar or similar marks in the drawings and descriptions have been used to refer to similar or similar parts of the utility model. As used herein, the terms "first", "second", and "third" etc. are used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0037] like Figures 1 to 7 As shown, according to an embodiment of the utility model, a three-track curtain is provided, including an upper track 1, a middle track 2, and a lower track 3, and a blackout curtain 4 is installed between the middle track 2 and the lower track 3. A middle track fabric groove 200 is provided at the lower part of the middle track 2, and a lower track fabric groove 300 is provided at the upper part of the lower track 3, and the upper and lower ends of the blackout curtain 4 are respectively installed in the middle track fabric groove 200 and the lower track fabric groove 300.

[0038] A threading rope 5 is passed through the upper track 1, the middle track 2, the lower track 3 and the blackout curtain 4. A rope collector installation groove 301 is provided below the lower track fabric groove 300 of the lower track 3, and a rope collector 6 is installed inside. The two ends of the threading rope 5 are connected to the rope collector 6 after passing through the upper track 1, the middle track 2, the lower track 3 and the blackout curtain 4, so that when the blackout curtain 4 is folded, the redundant part of the threading rope 5 can be rolled into the rope collector 6 to prevent the threading rope from being exposed and causing safety hazards. The rope collector 6 is a rope collector with a spring winding piece inside, which can make the curtain stationary at any position after pushing and pulling the middle track 2 and the lower track 3. The specific technical solution of the rope collector 6 is the existing technology and will not be repeated here. In addition, the rope collector of the traditional pleated curtain is set on the upper track. In order to ensure that the pleated curtain can stably stop at the designated position on the threading rope, a counterweight block needs to be set in the lower track to balance the tension of the rope collector and the total gravity of the pleated curtain, the middle track and the lower track. In this way, the overall weight of the curtain is relatively large, the fixation is unstable, and the service life of the curtain is easily shortened after long-term use. In this solution, the rope collector 6 is set in the lower track 3, and the gravity of the rope collector 6, the middle track 2, the lower track 3 and the blackout curtain 4 can be used to balance the tension of the rope collector 6 on the threading rope, reducing the use of counterweight blocks, reducing the overall weight of the curtain, facilitating fixation and saving costs.

[0039] Specifically, two through-holes are respectively provided on the upper rail 1, the middle rail 2 and the lower rail 3. The two ends of the rope 5 respectively pass through the two rope holes of the upper rail 1 and directly pass through the two rope holes of the middle rail 2. After passing through the middle rail 2, the two ends of the rope 5 cross each other and then pass through the blackout curtain 4 respectively. After passing through the blackout curtain 4, the two ends of the rope 5 directly pass through the two rope holes of the lower rail 3 and are connected to the rope collector 6.

[0040] The upper track 1 is fixedly connected with a Velcro 11, the back side of the fur surface of the Velcro 11 is adhered to the ceiling next to the window, and the hook surface of the Velcro 11 is adhered to the upper surface of the upper track 1. The curtain is fixed next to the window without punching holes by hooking the fur surface of the Velcro 11 with the hook surface. In addition, the Velcro 11 can also be replaced with a double-sided adhesive with a double-sided adhesive function, or the upper track 1 can be fixed to the wall by solvent bonding, gluing connection, magnetic connection, mechanical fastening, etc., and the non-hole fixation between the curtain as a whole and the window ceiling can still be achieved. The above fixing methods are all achievable by the existing technology and will not be repeated here.

[0041] Preferably, a downwardly recessed rope groove 100 is provided on the upper surface of the upper rail 1, and two rope threading holes of the upper rail 1 are provided inside the rope groove 100. The rope 5 passes through the rope threading holes and is embedded in the rope groove 100, so that the rope 5 can evenly apply the gravity of the lower middle rail 2, the lower rail 3 and the blackout curtain 4 to between the two rope threading holes of the rope groove 100, thereby preventing the upper rail 1 from being deformed in the length direction due to uneven force, resulting in poor overall fixation of the curtain and easy light leakage after the rail is deformed. In addition, when the rope 5 is embedded in the rope groove 100, it can also prevent the rope 5 from being stuck when the Velcro is pasted on the upper rail 1.

[0042] In addition, the above-mentioned curtain can also be fixed beside the window by a telescopic curtain rod, the upper track 1 is fixedly connected to the telescopic curtain rod, and the two ends of the telescopic curtain rod are squeezed and fixedly connected to the two side walls beside the window, so that the curtain can be fixed beside the window without punching holes. The telescopic curtain rod technology can be realized by the existing technology and will not be repeated here.

[0043] The edge of the upper surface of the upper rail 1 extends downward with a shielding edge 101, so that the cross section of the upper rail 1 is L-shaped. The corners of the middle rail 2 are chamfered, and when the middle rail 2 moves toward the upper rail 1, the upper part of the middle rail 2 can be embedded in the upper rail 1. At this time, the shielding edge 101 blocks the gap between the top surface of the upper rail 1 and the top surface of the middle rail 2 to prevent light from penetrating.

[0044] When the track is made of plastic material, the reciprocating pulling of the rope in the rope hole may easily cause serious wear of the rope hole, affecting the overall installation stability of the curtain. Preferably, protective rings are also provided in the rope holes of the upper track 1, the middle track 2, and the lower track 3.

[0045] Since the bottom of the rope collector installation groove 301 at the bottom of the lower rail 3 is fixed, it is inconvenient to install the protective ring. Therefore, preferably, a reserved hole 303 is set at the bottom of the rope collector installation groove 301 corresponding to the lower rail rope threading hole 302 to facilitate the installation tool to reach into the rope collector installation groove 301 to install the protective ring.

[0046] Preferably, the middle rail 2 and the lower rail 3 are retractable rails. Specifically, the two ends of the middle rail 2 are respectively slidably connected with the middle rail retractable kit 21, which is sleeved on the outside of the middle rail 2. The lower part of the middle rail retractable kit 21 is provided with a middle rail fabric retractable groove 210 for the blackout curtain 4 to pass through, and the upper part of the middle rail retractable kit 21 is provided with a fixed line retractable groove 211 along the sliding direction, so that when the middle rail retractable kit 21 slides toward the center of the middle rail 2, the threading rope 5 can pass through the fixed line retractable groove 211, thereby not affecting the pulling and drawing of the threading rope 5. The two ends of the lower rail 3 are respectively slidably connected with the lower rail retractable kit 31, which is sleeved on the outside of the lower rail 3, and the upper part of the lower rail retractable kit 31 is provided with a lower rail fabric retractable groove 310, so that the lower end of the blackout curtain 4 is installed in the lower rail retractable kit 31, and when the lower rail retractable kit 31 slides toward the center of the lower rail 3, it does not affect the pulling and drawing of the threading rope 5. The middle track 2 and the lower track 3 are set as retractable tracks, and the blackout curtain 4 can be cut according to the size of the window for use. The track does not need to be cut during the cutting process, which avoids the overall unsightly appearance of the curtain caused by irregular cutting and avoids scratches and other injuries caused by the cutting process. In addition, since the track does not need to be cut when adjusting the size, the overall weight of the curtain changes little before and after cutting, and there is no need to increase or decrease the counterweight block and then readjust the tension of the threading rope and the gravity it bears, which reduces the number of product accessories and is conducive to warehousing and distribution during the sales process.

[0047] Preferably, a first end cap 22 and a second end cap 32 are respectively installed at both ends of the middle rail 2 and the lower rail 3 to close the ends of the rails and improve the aesthetics.

[0048] Preferably, a middle rail handle 23 and a lower rail handle 33 are respectively installed on the middle rail 2 and the lower rail 3 to facilitate stretching or folding the blackout curtain 4.

[0049] Preferably, the lower rail handle 33 is detachably connected to a handle head 34. Specifically, a limit groove is provided on the outer surface of the lower rail handle 33, and a limit key is provided on the handle head 34. The handle head 34 is connected to the lower rail handle 33 by the cooperation of the limit groove and the limit key. Similarly, the middle rail handle 23 can also be provided with a detachable handle head in the above manner, which will not be described in detail in this solution. After the middle rail handle 23 and the lower rail handle 33 are set to be detachable, they can be easily disassembled and stored to reduce the packaging volume. In addition, the connection between the handle head 34 and the handle can also be set to a bolt connection or a knob connection structure, which can realize the detachable connection between the handle head and the handle, which will not be described one by one in this solution.

[0050] Preferably, the bottom plate of the lower track 3 is detachable, the bottom of the rope collector installation slot 301 at the lower part of the lower track 3 is open, and two opposite cover plate limiting slots 304 are arranged at its edge, and the two side edges of the cover plate 305 are respectively inserted into the corresponding cover plate limiting slots 304 to close the bottom of the rope collector installation slot 301. The bottom plate of the lower track 3 is detachable, which is convenient for removing the cover plate 305 and then installing the rope collector 6 inside the lower track 3, and there is no need to open a reserved hole, and the installation tool can be directly inserted into the rope collector installation slot 301 to install the protective ring.

[0051] Preferably, the three-track curtain of the utility model further includes a cutting assistant 7, including a main body 70 with a U-shaped cross section, a stopper 71 vertically arranged in the main body 70, and a cutting groove 72 penetrating from one side of the main body 70 to the other side, and the cutting groove 72 penetrates the stopper 71. When in use, the cutting assistant 7 is clamped on the folded blackout curtain 4, the cutting groove 72 is aligned with the cutting position on the blackout curtain 4, and the cutting knife is cut along the cutting groove 72. Since the bottom of the blackout curtain 4 abuts against the stopper 71, the cutting knife can continue to cut downward along the cutting groove 72, so that the blackout curtain 4 is cut more thoroughly and the edge is neater.

[0052] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0053] 1. The rope collector 6 is arranged inside the lower track 3, which has a significant advantage over the prior art that the rope collector 6 is arranged in the upper track. Since the setting of the counterweight block is eliminated, the overall weight of the curtain is reduced, which facilitates the stable installation of the curtain;

[0054] 2. The two ends of the threading rope 5 are crossed between the middle track 2 and the blackout curtain 4 before being inserted into the blackout curtain 4. When the operator pushes and pulls the middle track at a position not exactly in the middle of the middle track, the cross structure design of the threading rope 5 can ensure that the left and right sides of the blackout curtain are subjected to balanced pulling force, thereby achieving synchronous lifting and lowering of both sides, avoiding the situation where one side moves first or the pulling height is inconsistent. When traditional curtains are pushed and pulled at non-center points, the height asymmetry of the two sides of the curtain often occurs, requiring frequent manual adjustments. The adoption of this technical solution greatly reduces the uneven height caused by improper operation, and improves the convenience and comfort of use. The threading method disclosed in the present application enhances the stability of the overall operation of the blackout curtain, making the curtain smoother and straighter during the opening and closing process, thereby improving the overall performance and service life of the curtain.

[0055] 3. The middle track 2 and the lower track 3 are set as retractable tracks, and the length can be adjusted according to the size of the window. There is no need to cut the track when adjusting, which avoids the overall unsightly appearance of the curtain caused by irregular cutting, and avoids scratches and other injuries caused by the cutting process. In addition, after setting the retractable track, the track does not need to be cut when adjusting the size of the curtain, and the overall quality changes little, and there is no need to readjust the counterweight.

[0056] 4. A cutting assistant 7 is provided. After the cutting knife cuts to the bottom of the blackout curtain 4 along the cutting groove 72, the cutting knife can continue to cut downward along the cutting groove 72, so that the blackout curtain 4 is cut more thoroughly and the edge is neater.

[0057] 5. A shielding edge 101 extends downward from the edge of the upper surface of the upper track 1. When the middle track 2 moves toward the upper track 1, the upper part of the middle track 2 can be embedded in the upper track 1. At this time, the shielding edge 101 blocks the gap between the top surface of the upper track 1 and the top surface of the middle track 2, effectively preventing light from passing through the gap, thereby enhancing the overall shading effect of the curtain.

[0058] 6. The entire curtain can be installed next to the window using Velcro, without drilling holes, to avoid damage to the stress-bearing surface.

[0059] 7. Protective rings are provided in the rope threading holes of the upper rail 1, the middle rail 2 and the lower rail 3, which can effectively reduce the wear of the rope threading holes by threading the rope.

[0060] Compared with the prior art, the three-track curtain of the utility model has a smaller overall weight, is more stable to install, has a better shading effect, is easy to adjust and adapt to windows of various sizes, and the adjusted curtain is more beautiful overall.

[0061] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A three-track curtain, characterized in that: It comprises an upper track (1), a middle track (2) and a lower track (3), wherein a blackout curtain (4) is installed between the middle track (2) and the lower track (3); A rope collecting device (6) for both rope collecting and weight counterweight is installed inside the lower track (3); It also includes a threading rope (5), the two ends of which are respectively passed through the upper track (1), the middle track (2), the blackout curtain (4) and the lower track (3) in sequence and then rolled up in the rope retractor (6); a middle track fabric groove (200) is provided at the lower part of the middle track (2), a lower track fabric groove (300) is provided at the upper part of the lower track (3), and the upper and lower ends of the blackout curtain (4) are respectively installed in the middle track fabric groove (200) and the lower track fabric groove (300); At least one of the middle track (2) and the lower track (3) is a telescopic track.

2. The three-track curtain according to claim 1, characterized in that: The lower track (3) further comprises a rope collector installation groove (301) arranged below the lower track surface groove (300), and the rope collector (6) is installed in the rope collector installation groove (301).

3. The three-track curtain according to claim 1, characterized in that: A shielding edge (101) extends downward from the outer edge of the upper surface of the upper rail (1); when the middle rail (2) moves into the upper rail (1), the shielding edge (101) can shield the gap between the middle rail (2) and the upper rail (1).

4. The three-track curtain according to claim 1, characterized in that: The two ends of the threading rope (5) respectively pass through the middle track (2) and then cross each other, and then respectively pass through the blackout curtain (4).

5. The three-track curtain according to claim 1, characterized in that: The upper track (1) can be fixedly connected to the wall by any one of solvent bonding, gluing, magnetic connection, mechanical fastening, Velcro (11) or any combination of these connection methods.

6. The three-track curtain according to claim 1, characterized in that: The two ends of the middle rail (2) are respectively slidably connected with a middle rail telescopic kit (21), the lower part of the middle rail telescopic kit (21) is provided with a middle rail fabric telescopic groove (210) for the blackout curtain (4) to pass through, and the upper part of the middle rail telescopic kit (21) is provided with a fixed line telescopic groove (211) along the sliding direction.

7. The three-track curtain according to claim 2, characterized in that: The rope threading holes of the upper track (1), the middle track (2) and the lower track (3) are all provided with protection rings.

8. The three-track curtain according to claim 7, characterized in that: A reserved hole (303) is provided at the bottom of the rope collecting device installation groove (301) at a position corresponding to the rope threading hole of the lower track (3).

9. The three-track curtain according to claim 2, characterized in that: The lower track (3) also includes a detachable cover plate (305), and the cover plate (305) is arranged at the bottom of the rope collector installation slot (301). The bottom of the rope collector installation slot (301) is provided with two opposite limit slots (304), and the two side edges of the cover plate (305) are respectively inserted into the corresponding limit slots (304).

10. The three-track curtain according to claim 1, characterized in that: The invention also comprises a cutting aid (7), wherein the cutting aid (7) comprises a main body (70) with a U-shaped cross section, a stop block (71) is vertically arranged in the main body (70), and a cutting groove (72) is also arranged on the cutting aid (7) and passes through from one side of the main body (70) to the other side, and the cutting groove (72) passes through the stop block (71).

11. The three-track curtain according to claim 1, characterized in that: A middle rail handle (23) and a lower rail handle (33) are respectively installed on the middle rail (2) and the lower rail (3).

12. The three-track curtain according to claim 11, characterized in that: The middle rail handle (23) and the lower rail handle (33) are respectively detachably connected with handle heads.

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