Double-layer curtain

Abstract

Disclosed is a double-layer curtain, comprising an inner-layer curtain, an outer-layer curtain, and connecting members. A plurality of first openings are distributed on the inner-layer curtain in the length direction, a plurality of second openings corresponding to the first openings are distributed on the outer-layer curtain in the length direction, and each corresponding first opening and second opening allows a connecting member to penetrate through so as to connect the inner-layer curtain and the outer-layer curtain. The connecting members penetrate through the first openings and the second openings so that the inner-layer curtain and the outer-layer curtain are connected.

Description

Double-layer curtain

[0001] The present application claims priority to the Chinese patent application No. 202421938789.0, filed on August 12, 2024, and entitled "Double-layer curtain with connecting piece", the content of which is incorporated herein by reference in its entirety.

[0002] The present application claims priority to the Chinese patent application No. 202521536673.9, filed on July 22, 2025, and entitled "Double-layer curtain", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of window curtains, and in particular to a double-layer curtain. BACKGROUND

[0004] The double-layer curtain, which is combined by an inner curtain and an outer curtain, can provide better light-shading, heat-insulating and decorative effects than a single-layer curtain, and has become a widely used home decoration product. In order to realize the cooperative use of the inner and outer curtains, the traditional manufacturing process usually uses adhesive bonding or sewing thread sewing to connect and fix the two curtains at a specific position.

[0005] However, the above-mentioned traditional connection method has significant defects. Although the adhesive connection has a simple structure, its adhesion will naturally decay over time and in use environment, resulting in the loosening of the connection between the inner and outer curtains, affecting the overall function and appearance of the curtain, and when separated for cleaning or replacement, the curtain body is easily damaged due to tearing. Although the sewing connection is relatively firm, it is extremely inconvenient to disassemble, and the sewing thread must be destroyed to separate the two curtains, which not only hinders the local replacement and independent cleaning of the curtain, reduces the reusability of the product, but also affects the appearance, and the sewing process increases the complexity and production cost of manufacturing. SUMMARY

[0006] Therefore, the present application provides a double-layer curtain to solve the problem that the connection method of the double-layer curtain in the prior art cannot simultaneously consider simple installation, stable connection and easy disassembly and cleaning.

[0007] To achieve one or part or all of the above purposes or other purposes, the present application provides a double-layer curtain, which comprises an inner curtain, an outer curtain and a connecting piece. The inner curtain has a plurality of first openings distributed along the length direction. The outer curtain has a plurality of second openings corresponding to the first openings and distributed along the length direction. The corresponding first and second openings are used for the connecting piece to pass through to connect the inner and outer curtains, so that the double-layer curtain simultaneously considers simple installation, stable connection and easy disassembly and cleaning, and improves the use experience of the double-layer curtain.

[0008] Preferably, the interval distance between two adjacent second openings of the outer layer curtain in the vertical direction is S, and the interval distance between two adjacent first openings of the inner layer curtain in the vertical direction is L, wherein S>L, so that the portion of the outer layer curtain between the two adjacent second openings protrudes outward to form an arc-shaped decorative part.

[0009] Preferably, the inner layer curtain is provided with a plurality of inner folds arranged in the width direction thereof, and the inner folds are alternately distributed between two adjacent first openings in the length direction of the inner layer curtain. The outer layer curtain is provided with a plurality of outer folds arranged in the width direction thereof, and the outer folds are alternately distributed between two adjacent second openings in the length direction of the outer layer curtain.

[0010] Preferably, the first openings are distributed in the width direction of the inner layer curtain, and the second openings are distributed in the width direction of the outer layer curtain.

[0011] Preferably, the connecting member is provided with a through hole for the curtain pull cord to pass through to limit the connecting member from coming out of the first opening and the second opening.

[0012] Preferably, the connecting member includes a limiting portion passing through the first opening and the second opening, and a threading portion for limiting the connecting member from coming out of the first opening and the second opening.

[0013] Preferably, the connecting member is made of flexible material.

[0014] Preferably, the length of one side of the limiting portion away from the threading portion is less than the length of the side of the limiting portion close to the threading portion.

[0015] Preferably, the connecting member further includes a long strip-shaped series portion, the threading portion and the limiting portion are both provided with a plurality of portions, the limiting portions are distributed on one side of the series portion in the length direction of the series portion, and the threading portions are arranged one by one corresponding to the limiting portions.

[0016] Preferably, the connecting member is made of flexible material, the series portion is a flat strip, the series portion is divided into a front section, a middle section and a rear section in the width direction, the limiting portion is arranged on one side of the long edge of the front section, the third opening is arranged at the joint of the front section and the middle section, the front section is fixedly stacked on the middle section, the limiting portion passes through the third opening, and the rear section is fixedly stacked on the front section.

[0017] Preferably, the connecting piece comprises an outer rod, an inner rod and a plurality of insertion blocks, the front end of the insertion block is provided with an inner hole, the rear end of the insertion block is provided with an outer hole, the inner hole and the outer hole are arranged along the width direction of the insertion block, the insertion blocks are sequentially sleeved in a plurality of groups of first openings and second openings distributed along the width direction of the outer layer curtain, the inner rod is sleeved in a plurality of inner holes on one side of the inner layer curtain, and the outer rod is sleeved in a plurality of outer holes on one side of the outer layer curtain.

[0018] Preferably, the thickness of the front end of the insertion block gradually decreases away from the rear end.

[0019] Preferably, the inner hole and the outer hole are communicated, and an avoidance notch for connecting the inner hole and the outer hole is arranged on one side wall of the insertion block.

[0020] Preferably, the inner rod or the outer rod is composed of a plurality of mutually independent rods.

[0021] Preferably, the connecting piece comprises a connecting rod and a plurality of sleeve pieces, the sleeve piece comprises a limiting part passing through the first opening and the second opening, a penetrating part for limiting the sleeve piece from being taken out of the first opening and the second opening, and a sleeving part for sleeving the connecting rod, the penetrating part is sequentially sleeved in a plurality of groups of first openings and second openings distributed along the width direction of the outer layer curtain, and the connecting rod is sleeved on a plurality of sleeving parts on one side of the outer layer curtain.

[0022] Preferably, the sleeve piece is composed of a flexible waist-shaped sheet, the two sides of the end part of the waist-shaped sheet are provided with slits, the front end and the rear end of the waist-shaped sheet are fixedly overlapped, the middle part thereof is enclosed to form a sleeving part for sleeving the connecting rod, and the two slits on the same side of the waist-shaped sheet are communicated to form a penetrating part.

[0023] The embodiment of the present application has the following beneficial effects:

[0024] After the above-mentioned double-layer curtain is adopted, the inner layer curtain and the outer layer curtain are connected by passing the connecting piece through the first opening and the second opening, the structure can realize convenient installation and disassembly, and the replacement and cleaning of the curtain become more convenient and fast to adapt to different seasons and decoration needs, secondly, the use of adhesive or sewing can be avoided, the process complexity and production cost in the production process of the curtain are reduced, and the use experience of the double-layer curtain is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0026] Wherein:

[0027] Fig. 1 is an exploded view of the embodiment one of the present application;

[0028] Fig. 2 is a perspective view of the connecting piece in the embodiment one of the present application;

[0029] Fig. 3 is a perspective view of the connecting piece in the unfolded state and the folded state in the embodiment two of the present application;

[0030] Fig. 4 is a perspective view one of the connecting piece in the embodiment three of the present application;

[0031] Fig. 5 is a perspective view two of the connecting piece in the embodiment three of the present application;

[0032] Fig. 6 is a perspective view of the plug-in block in the embodiment three of the present application;

[0033] Fig. 7 is a perspective view of the connecting piece in the embodiment four of the present application;

[0034] Fig. 8 is a perspective view of the waist-shaped sheet and the sleeve connecting piece in the embodiment four of the present application;

[0035] Fig. 9 is a perspective view of the double-layer curtain in the back view in the embodiment four of the present application;

[0036] Fig. 10 is a perspective view of the double-layer curtain in the front view in the embodiment four of the present application.

[0037] In the drawings: 1, inner curtain; 11, first opening; 12, inner fold; 2, outer curtain; 21, second opening; 22, outer fold; 31, penetrating part; 32, limiting part; 33, series connection part; 331, front section; 332, middle section; 333, rear section; 34, third opening; 41, outer stick; 42, inner stick; 43, plug-in block; 44, inner hole; 45, outer hole; 46, avoiding gap; 51, connecting stick; 52, sleeve connecting piece; 53, sleeve connecting part; 54, waist-shaped sheet; 55, gap; a, through hole; b, pull rope. DETAILED DESCRIPTION

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description herein and the claims of the application and the above description of the drawings herein follow, the terms "including" and "comprising", and any variations thereof, are intended to cover a non-exclusive inclusion; the terms "first", "second", and the like used in the description herein are used to distinguish one object from another, not to describe a particular sequence.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in the specification appear at various locations in the specification are not necessarily all referring to the same embodiment, or are necessarily referring to different or alternative embodiments to each other. It is explicitly and implicitly understood that the embodiments described herein can be combined.

[0040] In order to make the technical personnel in the art better understand the application scheme, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings.

[0041] As shown in FIGS. 1-10, a double-layer curtain includes an inner curtain 1, an outer curtain 2, and a connecting piece. The inner curtain 1 has a plurality of first openings 11 distributed along the length direction. The outer curtain 2 has a plurality of second openings 21 corresponding to the first openings 11 and distributed along the length direction. The corresponding first openings 11 and second openings 21 are used for the connecting piece to pass through to connect the inner curtain 1 and the outer curtain 2. The inner curtain 1 and the outer curtain 2 are connected by passing the connecting piece through the first openings 11 and the second openings 21. This structure can be easily installed and disassembled, and the replacement and cleaning of the curtain become more convenient and fast to adapt to different seasons and decoration needs. Secondly, the use of adhesive or sewing can be avoided, reducing the process complexity and production cost in the curtain manufacturing process, while considering the characteristics of simple installation, stable connection, and easy disassembly and cleaning, etc., to improve the use experience of the double-layer curtain.

[0042] Further, the interval distance between two adjacent second openings 21 in the vertical direction of the outer curtain 2 is S, and the interval distance between two adjacent first openings 11 in the vertical direction of the inner curtain 1 is L, wherein S>L. When the interval distance S between the second openings 21 is greater than the interval distance L between the first openings 11, the outer curtain 2 can protrude outward and naturally fall to form a unit block. The part of the unit block that falls downward can cover the gap of the first openings 11 and the second openings 21 located below, so that the curtain maintains a good light tightness and avoids light overflow.

[0043] Further, the inner layer curtain 1 is provided with a plurality of inner folds 12 arranged along the width direction thereof, the inner folds 12 are alternately distributed along the length direction of the inner layer curtain 1 between adjacent two first openings 11, the outer layer curtain 2 is provided with a plurality of outer folds 22 arranged along the width direction thereof, the outer folds 22 are alternately distributed along the length direction of the outer layer curtain 2 between adjacent two second openings 21, in use, the inner layer curtain 1 is connected below the winding pipe, the winding pipe is connected with a pull rope b, the pull rope b passes through a plurality of connecting pieces in turn from bottom to top, the bottom end of the pull rope b is provided with a limiting head, when a user winds up the pull rope b through the winding pipe, the pull rope b will slide relative to the connecting pieces until the limiting head abuts against the lowermost connecting piece, at this time, the pull rope b will lift the lowermost connecting piece upward through the limiting head, so as to drive the inner layer curtain 1 and the outer layer curtain 2 to shrink upward, in this process, the inner layer curtain 1 will be folded upward step by step through the inner folds 12, and the outer layer curtain 2 will be folded upward step by step through the outer folds 22, so as to realize regular folding and unfolding of the double-layer curtain and improve the consistency of the visual perception.

[0044] Further, the first openings 11 are distributed in multiple in the width direction of the inner layer curtain 1, and the second openings 21 are distributed in multiple in the width direction of the outer layer curtain 2, so as to arrange more connecting pieces in the width direction of the curtain, increase the connecting point positions of the inner layer curtain 1 and the outer layer curtain 2 in the transverse direction, and improve the strength and stability of the connection.

[0045] Further, the connecting piece is provided with a through hole a for the curtain pull rope b to pass through to limit the connecting piece from coming out of the first opening 11 and the second opening 21, the diameter of the through hole a is greater than the diameter of the pull rope b, so that the pull rope b can easily pass through the through hole a without too much resistance, and the user can conveniently operate without the need of using additional tools or equipment, secondly, the larger diameter of the through hole a can reduce the friction between the pull rope b and the connecting piece, so as to reduce the force required when pulling the curtain. When the user needs to open or close the curtain, only needs to pull the pull rope b gently, so as to realize the control of the curtain without using too much force. This not only improves the user experience, but also prolongs the service life of the pull rope b and the connecting piece.

[0046] Embodiment one:

[0047] As shown in FIG. 1-2, further, the connecting piece includes a limiting portion 32 passing through the first opening 11 and the second opening 21, and a threading portion 31 for limiting the connecting piece from coming out of the first opening 11 and the second opening 21. A through hole a is provided on the limiting portion 32, and the threading portion 31 is designed to allow the connecting piece to easily pass through the first opening 11 and the second opening 21 on the inner layer curtain 1 and the outer layer curtain 2, thereby realizing the quick connection of the inner layer curtain 1 and the outer layer curtain 2. This design avoids the complex operation of using glue or sewing thread in the traditional connection method, and improves the efficiency and convenience of connection. The inner walls on both sides of the first opening 11 and the second opening 21 can be clamped in the threading portion 31 at the same time, thereby effectively preventing the connecting piece from coming out of the first opening 11 and the second opening 21, and ensuring the stability and reliability of the connection of the inner layer curtain 1 and the outer layer curtain 2. The limiting portion 32 can be realized in various ways, for example, the limiting portion 32 is made of elastic material, which can restore its original shape and clamp the edge of the opening after passing through the opening; or the limiting portion 32 is provided with barbs, protrusions and other structures, which can be clamped with the edge of the opening. Different shapes of the threading portion 31 can be selected according to the material and thickness of the curtain, such as round rod shape, I shape, oval shape, etc., to increase the stability and aesthetics of the connection. In addition, for some special occasions or needs, such as outdoor use or curtains that need to be windproof and waterproof, some special coatings or treatments can be added to the connecting piece to improve its durability and functionality. In summary, by reasonably designing the structure and material of the connecting piece, various different implementation methods can be realized to meet the diversified needs of users.

[0048] Further, the connecting piece is made of flexible material. In this embodiment, the connecting piece made of flexible material such as polyester fabric, cotton fabric, linen fabric, velvet fabric, silk fabric, etc. has good bending and folding performance, making it more convenient and flexible when connecting the inner layer curtain 1 and the outer layer curtain 2. Users can also easily fold the connecting piece into a suitable shape as needed, so that it can smoothly pass through the first opening 11 and the second opening 21 without damaging or deforming the curtain. In addition to using flexible materials, hard materials such as plastic, metal sheets, etc. can also be used by setting appropriate opening ratios and using left and right swinging methods to make the hard material pass into the opening.

[0049] Further, the length of the limiting portion 32 on the side away from the threading portion 31 is less than the length of the limiting portion 32 on the side close to the threading portion 31. This structure can facilitate the connecting piece to pass through the first opening 11 and the second opening 21, and improve the convenience during connection. The longer part on the other side will continue to pass through the opening and eventually clamp the edge on the other side. In this way, the limiting portion 32 can form a stable clamping structure to firmly fix the connecting piece on the curtain.

[0050] Embodiment two:

[0051] As shown in FIG. 3, further, the connecting piece further comprises a plurality of long strip-shaped series connection portions 33, and the plurality of penetrating portions 31 and the plurality of limiting portions 32 are provided in one-to-one correspondence.

[0052] As shown in FIG. 3, further, the connecting piece is made of flexible material, the series connection portion 33 is flat and strip-shaped, the series connection portion 33 is divided into a front section 331, a middle section 332 and a rear section 333 along the width direction, the limiting portion 32 is arranged on one side of the long edge of the front section 331, a third opening 34 is arranged at the joint of the front section 331 and the middle section 332, the front section 331 is fixedly stacked on the middle section 332, the limiting portion 32 penetrates through the third opening 34, and the rear section 333 is fixedly stacked on the front section 331, the portions of the front section 331, the middle section 332 and the rear section 333 that are in contact with each other are fixed by means of adhesion or sewing, so as to reduce the assembly difficulty of the connecting piece, increase the thickness of the series connection portion 33, and improve the structural stability and durability of the series connection portion 33, so as to simultaneously operate the plurality of limiting portions 32 to penetrate through the first opening 11 and the second opening 21 by means of the series connection portion 33, and improve the installation efficiency.

[0053] Embodiment three:

[0054] As shown in FIGS. 4-6, further, the connecting piece comprises an outer rod 41, an inner rod 42 and a plurality of plug blocks 43, a through hole a is arranged at the front end of the plug block 43, an inner hole 44 is arranged at the front end of the plug block 43, and an outer hole 45 is arranged at the rear end of the plug block 43, the inner hole 44 and the outer hole 45 are arranged along the width direction of the plug block 43, the plug block 43 is sequentially sleeved in the plurality of groups of first openings 11 and second openings 21 distributed along the width direction of the outer layer curtain 2, the inner rod 42 is sleeved in the plurality of inner holes 44 on one side of the inner layer curtain 1, and the outer rod 41 is sleeved in the plurality of outer holes 45 on one side of the outer layer curtain 2, the inner rod 42 and the outer rod 41 are connected in series with the plurality of plug blocks 43 in the width direction of the double-layer curtain, the plug blocks 43 are limited, the plug blocks 43 are prevented from easily separating from the first openings 11 and the second openings 21, and the corresponding positions of the inner layer curtain 1 and the outer layer curtain 2 are fixedly clamped, in the assembly, the plurality of plug blocks 43 are sleeved on the outer rod 41 through the outer hole 45, then the plurality of plug blocks 43 are controlled to penetrate through the corresponding first openings 11 and second openings 21 by means of the outer rod 41, and finally the inner rod 42 is sleeved in the inner holes 44 of the plurality of plug blocks 43.

[0055] Further, the front end of the plug block 43 gradually reduces in thickness in the direction away from the rear end, so as to penetrate through the first openings 11 and the second openings 21 by means of the tapered front end of the plug block 43, and reduce the difficulty of sleeving operation.

[0056] Further, the plug 43 has a certain elasticity, which can be any one of metal, plastic or fiber material, and is preferably plastic in the embodiment. The inner hole 44 and the outer hole 45 are in communication, and the plug 43 has an avoiding gap 46 on one side wall, which connects the inner hole 44 and the outer hole 45. During assembly, the outer rod 41 can be directly clamped into the outer hole 45 through the avoiding gap 46. Similarly, when the front end of the plug 43 passes through the first opening 11 and the second opening 21, the inner rod 42 can also be clamped into the inner hole 44 through the avoiding gap 46, thereby avoiding the frequent alignment of the hole position and the sleeving action, and improving the convenience of the connection operation.

[0057] As shown in FIG. 4, further, the inner rod 42 or the outer rod 41 is composed of a plurality of independent rods. Taking the inner rod 42 composed of a plurality of independent rods as an example, a plurality of plugs 43 can be connected in series by the integral outer rod 41, and when the plug 43 passes through the first opening 11 and the second opening 21, the inner hole 44 of each plug 43 can be sleeved with the independent rod, thereby avoiding the interference of the integral inner rod 42 with the plurality of plugs 43 during the clamping process due to the different connection steps, improving the connection experience, and improving the flexibility of the connection operation of the inner rod 42 and the plurality of plugs 43.

[0058] Embodiment Four:

[0059] As shown in FIGS. 7-10, further, the connecting piece includes a connecting rod 51 and a plurality of sleeving pieces 52. The sleeving piece 52 includes a limiting portion 32 passing through the first opening 11 and the second opening 21, a penetrating portion 31 for limiting the sleeving piece 52 from escaping from the first opening 11 and the second opening 21, and a sleeving portion 53 for sleeving the connecting rod 51. The through hole a is provided on the limiting portion 32, and the sleeving piece 52 is sleeved in the plurality of groups of first openings 11 and second openings 21 distributed along the width direction of the outer layer curtain 2 through the limiting portion 32. The connecting rod 51 is sleeved on the plurality of sleeving portions 53 on one side of the outer layer curtain 2, so as to limit the sleeving piece 52 from escaping from the first opening 11 and the second opening 21 through the penetrating portion 31. The pulling rope b can pass through a plurality of corresponding through holes a in the vertical direction one by one. During use, the plurality of sleeving pieces 52 can be connected in series through the connecting rod 51, so that the user can control the plurality of sleeving pieces 52 to pass through the corresponding first openings 11 and second openings 21 through the connecting rod 51, thereby improving the convenience of the operation. A plurality of sleeving pieces 52 corresponding in the vertical direction are connected in series through the plurality of pulling ropes b, so as to drive the sleeving pieces 52 to move in the vertical direction synchronously through the pulling ropes b, thereby controlling the folding and unfolding of the double-layer curtain.

[0060] As shown in Fig. 8, further, the sleeve joint 52 is made of a flexible waist piece 54, both sides of the end of the waist piece 54 are provided with an opening 55, the front end and the rear end of the waist piece 54 are fixedly overlapped, the middle part thereof is enclosed to form a sleeve joint part 53 for sleeving the connecting rod 51, the two openings 55 on the same side of the waist piece 54 are communicated to form the penetrating part 31, the front end and the rear end of the waist piece 54 are fixedly connected by means of gluing or sewing, the flexible sleeve joint 52 can pass through the first opening 11 and the second opening 21 by deformation, the principle is the same as above, meanwhile, it is also beneficial to reduce the size of the first opening 11 and the second opening 21, and is beneficial to improve the tightness of the penetration and cooperation, and improve the connection stability.

[0061] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A dual layer window covering, comprising: The application relates to a window curtain, which comprises an inner layer curtain, an outer layer curtain and a connecting piece. The interval distance between two adjacent second openings in the vertical direction of the outer layer curtain is S, and the interval distance between two adjacent first openings in the vertical direction of the inner layer curtain is L, wherein S>L.

2. A dual layer window treatment according to claim 1, wherein, The inner layer curtain is provided with a plurality of inner folds arranged in the width direction of the inner layer curtain, and the inner folds are alternately arranged between two adjacent first openings in the length direction of the inner layer curtain; the outer layer curtain is provided with a plurality of outer folds arranged in the width direction of the outer layer curtain, and the outer folds are alternately arranged between two adjacent second openings in the length direction of the outer layer curtain.

3. The dual shade of claim 1, wherein, The first openings are arranged in the width direction of the inner layer curtain, and the second openings are arranged in the width direction of the outer layer curtain.

4. The dual shade of claim 1, wherein, The connecting piece is provided with a through hole for passing a curtain pull rope so as to limit the connecting piece from being pulled out of the first opening and the second opening.

5. The dual shade of claim 1, wherein, The connecting piece comprises a limiting part penetrating the first opening and the second opening, and a penetrating part for limiting the connecting piece from being pulled out of the first opening and the second opening.

6. A dual layer window treatment according to any one of claims 1-5, wherein, The connecting piece is made of flexible material.

7. A dual layer window treatment according to claim 6, wherein, The length of one side of the limiting part away from the penetrating part is smaller than the length of the other side of the limiting part close to the penetrating part.

8. A dual layer window treatment according to claim 6, wherein, The connecting piece further comprises a long strip-shaped connecting part, and the penetrating part and the limiting part are arranged in plurality, the limiting part is arranged on one side of the connecting part in the length direction, and the penetrating part is arranged corresponding to the limiting part.

9. The dual shade of claim 6 wherein, The connecting part is made of flexible material, the connecting part is a flat strip, the connecting part is divided into a front section, a middle section and a rear section in the width direction, the limiting part is arranged on one side of the long edge of the front section, a third opening is arranged at the joint of the front section and the middle section, the front section is fixedly stacked on the middle section, the limiting part penetrates the third opening, and the rear section is fixedly stacked on the front section.

10. A dual layer window treatment according to claim 9, wherein, The connecting piece comprises an outer rod, an inner rod and a plurality of plug blocks.

11. The dual shade of claim 4 wherein, The front end of the plug block is provided with an inner hole, and the rear end of the plug block is provided with an outer hole, the inner hole and the outer hole are arranged in the width direction of the plug block, the plug blocks are sequentially sleeved in a plurality of groups of first openings and second openings arranged in the width direction of the outer layer curtain, the inner rod is sleeved in a plurality of inner holes arranged on one side of the inner layer curtain, and the outer rod is sleeved in a plurality of outer holes arranged on one side of the outer layer curtain. The thickness of the front end of the plug block gradually decreases away from the rear end.

12. A dual layer window treatment according to claim 11, wherein, The inner hole and the outer hole are communicated, and an avoiding gap is arranged on one side wall of the plug block to connect the inner hole and the outer hole.

13. The dual shade of claim 11, wherein, The inner rod or the outer rod is composed of a plurality of independent rods.

14. The dual shade of claim 11, wherein, The connecting piece comprises a joint rod and a plurality of sleeve pieces.

15. The dual shade of claim 4 wherein, ​ The sleeve joint comprises a limiting part passing through the first and second openings, a passing part for limiting the sleeve joint from coming out of the first and second openings, and a sleeve part for sleeving the connecting rod, the passing part is sleeved in the first and second openings distributed in the width direction of the outer layer curtain, and the connecting rod is sleeved in the sleeve part on one side of the outer layer curtain.

16. A dual layer window treatment according to claim 15, wherein, The sleeve joint is made of a flexible waist-shaped sheet, both sides of the end of the waist-shaped sheet are provided with an opening, the front end and the rear end of the waist-shaped sheet are fixedly overlapped, the middle part is enclosed to form a sleeve part for sleeving the connecting rod, and the two openings on the same side of the waist-shaped sheet are connected to form a passing part.

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