Aluminum alloy window with sealing structure

Abstract

The utility model relates to the field of aluminum alloy windows, in particular to an aluminum alloy window with a sealing structure, which comprises a window frame and two window sashes slidably connected to the inner side of the window frame, the window sashes are respectively staggered, notches are respectively arranged around the window sashes, and two guide rails are respectively connected to the top and the bottom of the inner side of the window frame at intervals. Limiting wheel assemblies are symmetrically arranged on the tops of the window sashes, guide wheel assemblies are symmetrically arranged at the bottoms of the window sashes, and the guide wheel assemblies and the limiting wheel assemblies are in rolling contact with the corresponding guide rails correspondingly and are installed in the notches correspondingly. When the sealing device is closed, the elastic cushion block is compressed to further fill a gap and enhance the sealing effect, meanwhile, the U-shaped frame is rotated to enable the L-shaped push plate to enter the U-shaped frame, the L-shaped push plate is pushed to move towards the fixed block under the action of the driving piece, the elastic cushion block is further compressed, the gap between the window sash and the window frame is filled and compressed, and tighter sealing is achieved. The window sash is prevented from shaking, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of aluminum alloy windows, in particular to an aluminum alloy window with a sealing structure. Background Art

[0002] An aluminum alloy window is a window made of aluminum alloy building profiles for frames and sashes. It is mainly divided into ordinary aluminum alloy doors and windows and broken bridge aluminum alloy doors and windows. Since the surface layer of aluminum alloy doors and windows does not need to be painted again during application, maintenance, and upkeep, it does not fade, fall off, is corrosion-resistant, has high compressive strength, and is durable, so it has been widely used in modern architecture.

[0003] In view of the above related technologies, the inventor found that for traditional push-pull aluminum alloy windows, after frequently opening and closing the doors and windows, the sashes and window frames will become loose and generate gaps, which are likely to shake in strong wind weather, resulting in outdoor air directly entering the room without filtration and adjustment. Moreover, traditional push-pull aluminum alloy windows do not have a sealing structure, which is likely to affect the indoor temperature control, especially in winter, when the cold wind will exacerbate the cold feeling indoors. Summary of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide an aluminum alloy window with a sealing structure to prevent external air from directly entering the room, improve the sealing performance of the aluminum alloy window, and reduce the shaking amplitude of the sashes.

[0005] To solve the above technical problem, one technical solution adopted by the utility model is: to provide an aluminum alloy window with a sealing structure, including: a window frame and two sashes slidably connected to the inner side of the window frame. The sashes are arranged alternately. Grooves are respectively formed around the sashes. Two guide rails are respectively and spacedly connected to the top and bottom of the inner side of the window frame. Limiting wheel assemblies are symmetrically arranged at the top of the sashes, and guiding wheel assemblies are symmetrically arranged at the bottom. The guiding wheel assemblies and the limiting wheel assemblies are respectively in rolling contact with the corresponding guide rails. The limiting wheel assemblies and the guiding wheel assemblies are respectively installed in the grooves. Closing strip plates are respectively clamped on both sides of the sashes, and a plurality of elastic cushion blocks are respectively connected to the opposite sides of the closing strip plates;

[0006] Sealing and fixing components are respectively connected to the opposite sides of the window frame. The sealing and fixing components include L-shaped push plates connected to the sashes and fixing blocks symmetrically connected to the sashes. A rotating shaft is rotatably connected between the fixing blocks. A U-shaped frame is connected to the outer circle of the rotating shaft. When the U-shaped frame rotates towards the sash and the elastic cushion blocks are all located inside the window frame, the L-shaped push plates are located inside the U-shaped frame. A driving member for driving the L-shaped push plates to move towards the fixing blocks is also connected to the closed end of the U-shaped frame.

[0007] By adopting the above technical solutions, the notch provides space for installing components such as the limit wheel assembly, guide wheel assembly, and closing strip plate, ensuring that these components can be firmly fixed on the window sash and play the roles of sealing and guiding. When the window sash is opened or closed, it is guided by the guide rail and the limit wheel assembly rolls in contact with the guide rail, restricting the movement of the window sash in the vertical direction, preventing the window sash from shaking and falling off. Cooperating with the guide wheel assembly at the bottom of the window sash, the window sash slides smoothly in the horizontal direction. When the window sash is closed, the elastic cushion block is compressed, further filling the gap, enhancing the sealing effect, and playing a buffering role, reducing noise and vibration. At the same time, the U-shaped frame is rotated to make the L-shaped push plate enter the U-shaped frame. Under the action of the driving member, the L-shaped push plate is pushed towards the fixed block, further compressing the elastic cushion block and filling and pressing the gap between the window sash and the window frame, achieving a tighter seal, preventing the window sash from shaking and improving its sealing effect.

[0008] In a preferred embodiment of the present utility model, it can be further configured as follows: a limit groove is provided on one side of the fixed block away from the U-shaped frame. The driving member includes a threaded rod passing through the U-shaped frame and on the same axis as the limit groove. One end of the threaded rod is connected with a universal ball, and the other end is connected with a driving handle. The universal ball is arranged close to the limit groove, and the diameter of the limit groove is larger than the diameter of the universal ball.

[0009] By adopting the above technical solutions, when the driving handle rotates the threaded rod to drive the L-shaped push plate towards the fixed block, after the universal ball enters the limit groove, the universal ball can move along a predetermined trajectory during rotation, avoiding deviation or shaking, thereby improving the stability and reliability of the sealing and fixing assembly.

[0010] In a preferred embodiment of the present utility model, it can be further configured as follows: the guide wheel assembly includes a U-shaped mounting plate. Inside the mounting plate, rollers are symmetrically installed. The bottom of the rollers is located below the bottom of the mounting plate. Ring-shaped engaging grooves are respectively provided on the rollers, and the ring-shaped engaging grooves are fitted with the top ends of the bottom guide rails.

[0011] By adopting the above technical solutions, during the pushing and pulling process of the window sash, the rolling contact between the rollers and the guide rail reduces friction and wear, making the opening and closing of the window sash smoother and easier. Moreover, the bottom of the rollers protrudes below the mounting plate, which helps to prevent the window sash from shaking or deviating during the sliding process, improving the stability of the window sash. Cooperating with the ring-shaped engaging grooves, it ensures that the rollers always remain in the correct position on the guide rail during the rolling process, avoiding the risk of derailment or deviation from the track and reducing the shaking amplitude.

[0012] In a preferred embodiment, the present utility model can be further configured as follows: The limit wheel assembly includes a mounting frame and a limit opening formed at the top thereof. A driving plate is connected to the top of the mounting frame. A guiding groove is formed at the top of the driving plate. A V-shaped bracket is arranged at the top of the driving plate. Two ends of the top of the V-shaped bracket are respectively connected with limit wheels. Two ends of the bottom of the V-shaped bracket are respectively connected with guiding rods. The V-shaped bracket is connected to the mounting frame through a pin shaft and penetrates through the guiding groove. An arc-shaped opening corresponding to the guiding rod is formed on the driving plate. The guiding rods are respectively located in the corresponding arc-shaped openings. The arc-shaped openings are adapted to guide the V-shaped bracket to tilt and rotate. The bottom end of the top guide rail is located between the limit wheels and is in rolling contact with them. A driving block is connected to the driving plate. The driving block is located in the limit opening and its bottom end is located below the limit opening. A driving screw penetrates through one side of the mounting frame. The driving screw is in threaded connection with the driving block. The driving screw is arranged close to the closing strip.

[0013] By adopting the above technical solution, during the pushing and pulling process of the window sash, the limit wheels are in rolling contact with the bottom end of the top guide rail, effectively restricting the vertical displacement of the window sash during the sliding process, preventing the window sash from tilting excessively when opening or closing, and correcting it during the moving process, reducing the shaking amplitude. Moreover, the V-shaped bracket cooperates with the arc-shaped openings on the driving plate through the guiding rods, enabling the V-shaped bracket to tilt and rotate within a certain range, so that the limit wheel assembly can dynamically adjust the contact angle and force between the limit wheels and the guide rail according to the actual position of the window sash, ensuring the limiting effect while reducing friction and wear.

[0014] In a preferred embodiment, the present utility model can be further configured as follows: Clamping wires are symmetrically formed in the groove openings on both sides of the window sash. Elastic L-shaped clamping strips are symmetrically formed on the side of the closing strip close to the window sash. The elastic L-shaped clamping strips are respectively clamped into the clamping wires.

[0015] By adopting the above technical solution, the cooperation between the clamping wires and the elastic L-shaped clamping strips realizes the firm connection between the closing strip plate and the window sash, effectively preventing the closing strip plate from loosening or falling off during long-term use. When the elastic L-shaped clamping strips are clamped into the clamping wires, due to their elastic characteristics, they can closely fit in the groove openings of the window sash, thereby further enhancing the sealing performance between the window sash and the closing strip plate, preventing external factors such as wind, rain, and dust from invading the room, and improving the comfort and safety of the room.

[0016] In a preferred embodiment, the present utility model can be further configured as follows: Wool strips are symmetrically installed at the top and bottom of the window sash.

[0017] By adopting the above technical solution, the wool strips fill the tiny gaps between the window sash and the window frame, preventing cold air or hot air from freely flowing between the indoor and outdoor, thereby improving the sealing performance of the doors and windows. It can also prevent rainwater from seeping into the room through the gaps, and absorb and buffer part of the noise.

[0018] In summary, the utility model includes at least one of the following beneficial technical effects of an aluminum alloy window with a sealing structure:

[0019] 1. By symmetrically installing wool strips at the top and bottom of the window sash, and designing an elastic L-shaped clamping strip to closely cooperate with the clamping wire in the window sash groove, the sealing performance of the door and window system is improved. As an efficient sealing material, the wool strip can closely fit the tiny gaps between the window sash and the window frame, effectively preventing the penetration of air, rainwater, and dust. In winter, it can effectively block the intrusion of cold air from the outside, reduce the loss of indoor heat, and improve the living comfort; in summer, it can prevent the entry of hot air from the outside into the room, reduce air conditioning energy consumption. At the same time, the seamless connection between the elastic L-shaped clamping strip and the clamping wire further strengthens the overall sealing effect of the doors and windows, ensuring the constant temperature and cleanliness of the indoor environment.

[0020] 2. Through the guide rail to provide guidance and make the limit wheel assembly rollingly contact with the guide rail, the movement of the window sash in the vertical direction is restricted, preventing the window sash from shaking and falling off. Cooperating with the guide wheel assembly at the bottom of the window sash, the window sash slides smoothly in the horizontal direction. When the window sash is closed, the elastic cushion block is compressed, further filling the gap and enhancing the sealing effect. At the same time, rotate the U-shaped frame to make the L-shaped push plate enter the U-shaped frame. Through the action of the driving member, the L-shaped push plate is pushed towards the fixed block, further compressing the elastic cushion block and filling and pressing the gap between the window sash and the window frame, achieving a tighter seal, preventing the window sash from shaking and improving its sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, where:

[0022] Figure 1 is the structural schematic diagram of the present utility model;

[0023] Figure 2 is the structural schematic diagram of the guide wheel assembly of the present utility model;

[0024] Figure 3 is the structural schematic diagram of the limit wheel assembly of the present utility model;

[0025] Figure 4 is Figure 3 the exploded view of;

[0026] Figure 5 is Figure 1 the enlarged view of part A in;

[0027] Figure 6 is Figure 1 the enlarged view of part B in

[0028] In the figure: 1, window frame; 2, window sash; 3, notch; 4, guide rail; 50, limit wheel assembly; 60, guide wheel assembly; 7, closing strip; 8, elastic cushion block; 90, sealing and fixing assembly; 11, limit groove; 12, clamping wire; 13, elastic L-shaped clamping strip; 14, felt strip;

[0029] 51, mounting bracket; 52, limit port; 53, drive plate; 54, guide groove; 55, V-shaped bracket; 56, limit wheel; 57, guide rod; 58, arc port; 59, drive block; 5a, drive screw;

[0030] 61, mounting plate; 62, roller; 63, annular engaging groove;

[0031] 91, L-shaped push plate; 92, fixing block; 93, rotating shaft; 94, U-shaped bracket; 95, driving part;

[0032] 951, threaded rod; 952, universal ball; 953, driving handle. Specific embodiments

[0033] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present utility model.

[0034] It should be noted that these drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present utility model in a schematic manner, and therefore only show the components related to the present utility model.

[0035] Refer to Figures 1-6, an aluminum alloy window with a sealing structure disclosed by the present utility model, comprising: a window frame 1 and two window sashes 2 slidably connected to the inner side of the window frame 1, the window sashes 2 are arranged staggered respectively, notch 3s are respectively opened around the window sashes 2, two guide rails 4 are respectively and spacedly connected to the top and bottom of the inner side of the window frame 1, limiting wheel assemblies 50 are symmetrically arranged at the top of the window sashes 2, guiding wheel assemblies 60 are symmetrically arranged at the bottom, the guiding wheel assemblies 60 and the limiting wheel assemblies 50 are respectively in rolling contact with the corresponding guide rails 4, the limiting wheel assemblies 50 and the guiding wheel assemblies 60 are respectively installed in the notch 3s, closing strip plates 7 are respectively clamped on both sides of the window sashes 2, several elastic cushion blocks 8 are respectively connected to the opposite sides of the closing strip plates 7, wool strips 14 are symmetrically installed at the top and bottom of the window sashes 2, clamping wires 12 are symmetrically opened in the notch 3s on both sides of the window sashes 2, elastic L-shaped clamping strips 13 are symmetrically opened on the side of the closing strip plates 7 close to the window sashes 2, the elastic L-shaped clamping strips 13 are respectively clamped into the clamping wires 12, sealing and fixing assemblies 90 are respectively connected to the opposite sides of the window frame 1, the sealing and fixing assemblies 90 include L-shaped push plates 91 connected to the window sashes 2 and fixing blocks 92 symmetrically connected to the window sashes 2, a rotating shaft 93 is rotatably connected between the fixing blocks 92, a U-shaped frame 94 is connected to the outer circle of the rotating shaft 93, when the U-shaped frame 94 rotates towards the window sashes 2 and the elastic cushion blocks 8 are all located inside the window frame 1, the L-shaped push plates 91 are located inside the U-shaped frame 94, a driving member 95 for driving the L-shaped push plates 91 to move towards the fixing blocks 92 is further connected to the closing end of the U-shaped frame 94, a limiting groove 11 is opened on the side of the fixing block 92 away from the U-shaped frame 94, the driving member 95 includes a threaded rod 951 passing through the U-shaped frame 94 and on the same axis as the limiting groove 11, one end of the threaded rod 951 is connected with a universal ball 952, the other end is connected with a driving handle 953, the universal ball 952 is arranged close to the limiting groove 11, and the diameter of the limiting groove 11 is larger than the diameter of the universal ball 952; the opposite sides of the guide rails 4 are all chamfered, during the process of pushing, pulling, opening or closing the window sashes 2, the L-shaped push plates 91 act as handles, the notch 3s provide space for installing components such as the limiting wheel assemblies 50, the guiding wheel assemblies 60, and the closing strip plates 7, ensuring that these components can be firmly fixed on the window sashes 2 and playing roles of sealing and guiding, enabling the limiting wheel assemblies 50 and the guiding wheel assemblies 60 to be in rolling contact with the guide rails 4 and reducing friction, making the sliding of the window sashes 2 smoother, restricting the movement of the window sashes 2 in the vertical direction, preventing the window sashes 2 from shaking and falling off, and when the window sashes 2 are closed, the closing strip plates 7 and the elastic cushion blocks 8 are closely attached inside the notch 3s of the window sashes 2, enhancing the sealing performance of the window sashes 2, and rotating the U-shaped frame 94, driving the threaded rod 951 and the universal ball 952 by using the driving handle 953, limiting the limiting groove 11 to achieve the effect of locking and fixing, and simultaneously compressing the elastic cushion blocks 8 to further fill the gaps and enhance the sealing effect.

[0036] The guide wheel assembly 60 includes a mounting plate 61 with a U-shaped cross-section. Inside the mounting plate 61, rollers 62 are symmetrically installed. The bottom of the rollers 62 is located below the bottom of the mounting plate 61. Annular engaging grooves 63 are respectively formed on the rollers 62, and the annular engaging grooves 63 fit with the top end of the bottom guide rail 4. The mounting plate 61 is connected to the window sash 2 by screws. When the window sash 2 is opened and closed, the rolling contact between the rollers 62 and the guide rail 4 reduces friction, making the opening and closing of the window sash 2 smoother and easier. Moreover, the annular engaging grooves 63 can prevent the window sash 2 from wobbling or shifting during the sliding process, improving the stability of the window sash 2 and reducing the wobbling amplitude.

[0037] The limit wheel assembly 50 includes a mounting frame 51 and a limit opening 52 formed at its top. A driving plate 53 is connected to the top of the mounting frame 51. A guide groove 54 is formed at the top of the driving plate 53. A V-shaped bracket 55 is arranged at the top of the driving plate 53. At both ends of the top of the V-shaped bracket 55, limit wheels 56 are respectively connected. At both ends of the bottom of the V-shaped bracket 55, guide rods 57 are respectively connected. The V-shaped bracket 55 is connected to the mounting frame 51 by a pin shaft and penetrates through the guide groove 54. An arc-shaped opening 58 corresponding to the guide rods 57 is formed on the driving plate 53. The guide rods 57 are respectively located in the corresponding arc-shaped openings 58. The arc-shaped openings 58 are adapted to guide the V-shaped bracket 55 to tilt and rotate. The bottom end of the top guide rail 4 is located between the limit wheels 56 and is in rolling contact with them. A driving block 59 is connected to the driving plate 53. The driving block 59 is located in the limit opening 52 and its bottom end is located below the limit opening 52. A driving screw 5a penetrates through one side of the mounting frame 51. The driving screw 5a is threadedly connected to the driving block 59. The driving screw 5a is arranged close to the closing strip plate 7. The mounting frame 51 is connected to the window sash 2 by screws. When the window sash 2 is pushed and pulled, the limit wheels 56 are respectively in rolling contact with the bottom end of the top guide rail 4. And since the limit wheels 56 are respectively located on both sides of the guide rail 4, the gap between the V-shaped brackets 55 provides a clearance for movement, effectively preventing the window sash 2 from tilting when it is opened or closed and correcting it during the moving process, reducing the wobbling amplitude.

[0038] The implementation principle of this embodiment is as follows: When the window sash 2 is opened or closed, the rolling contact between the roller 62 and the guide rail 4 reduces friction. The limit wheels 56 are in rolling contact with the bottom ends of the top guide rails 4 respectively. Since the limit wheels 56 are located on both sides of the guide rail 4 respectively, the annular engaging groove 63 fits with the top end of the bottom guide rail 4, making the window sash 2 smooth and easy to slide during the sliding process, and reducing the shaking amplitude. When the window sash 2 is closed, the user pushes the L-shaped push plate 91, so that the end of the corresponding window sash 2 enters the inner card slot of the window frame 1. At this time, the closing strip plate 7 and the elastic cushion block 8 are closely attached to the notch 3 of the window sash 2. Subsequently, the user rotates the U-shaped frame 94 to sleeved the U-shaped frame 94 outside the L-shaped push plate 91, and rotates the driving handle 953 to drive the driving threaded rod 951 and the universal ball 952 to rotate into the limit groove 11, achieving the effect of locking and fastening, and compressing the elastic cushion block 8 during the continuous movement process to further fill the gap and enhance the overall sealing effect of the window. In cooperation with the wool strip 14, it fills the tiny gap between the window sash 2 and the window frame 1 to prevent cold air or hot air from freely flowing between indoors and outdoors, thereby improving the sealing performance of the doors and windows.

[0039] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An aluminum alloy window with a sealing structure, comprising: A window frame (1) and two window sashes (2) slidably connected to the inside of the window frame (1), the window sashes (2) being arranged alternately, notch openings (3) being respectively formed around the window sashes (2), characterized in that two guide rails (4) are respectively and spacedly connected to the top and bottom inside the window frame (1), limit wheel assemblies (50) are symmetrically arranged at the top of the window sashes (2), and guide wheel assemblies (60) are symmetrically arranged at the bottom, the guide wheel assemblies (60) and the limit wheel assemblies (50) are respectively in rolling contact with the corresponding guide rails (4), the limit wheel assemblies (50) and the guide wheel assemblies (60) are respectively installed in the notch openings (3), closing strips (7) are respectively clamped on both sides of the window sashes (2), and a plurality of elastic cushion blocks (8) are respectively connected to the opposite sides of the closing strips (7); Sealing and fixing assemblies (90) are respectively connected to the opposite sides of the window frame (1), the sealing and fixing assemblies (90) include L-shaped push plates (91) connected to the window sashes (2) and fixing blocks (92) symmetrically connected to the window sashes (2), a rotating shaft (93) is rotatably connected between the fixing blocks (92), a U-shaped frame (94) is connected to the outer circle of the rotating shaft (93), when the U-shaped frame (94) rotates towards the window sash (2) and the elastic cushion blocks (8) are all located inside the window frame (1), the L-shaped push plate (91) is located inside the U-shaped frame (94), and a driving member (95) for driving the L-shaped push plate (91) to move towards the fixing block (92) is further connected to the closing end of the U-shaped frame (94).

2. The aluminum alloy window with a sealing structure according to claim 1, characterized in that, A limit groove (11) is formed in the side of the fixing block (92) away from the U-shaped frame (94), the driving member (95) includes a threaded rod (951) passing through the U-shaped frame (94) and on the same axis as the limit groove (11), one end of the threaded rod (951) is connected to a universal ball (952), the other end is connected to a driving handle (953), the universal ball (952) is arranged close to the limit groove (11), and the diameter of the limit groove (11) is larger than the diameter of the universal ball (952).

3. The aluminum alloy window with a sealing structure according to claim 1, wherein, The guide wheel assembly (60) includes a U-shaped mounting plate (61), rollers (62) are symmetrically installed inside the mounting plate (61), the bottoms of the rollers (62) are located below the bottom of the mounting plate (61), annular engaging grooves (63) are respectively formed in the rollers (62), and the annular engaging grooves (63) are fitted with the tops of the bottom guide rails (4).

4. A kind of aluminum alloy window with a sealing structure according to claim 1, characterized in that, The limiting wheel assembly (50) includes a mounting bracket (51) and a limiting opening (52) formed at the top thereof. A driving plate (53) is connected to the top of the mounting bracket (51). A guiding groove (54) is formed at the top of the driving plate (53). A V-shaped bracket (55) is disposed at the top of the driving plate (53). Limiting wheels (56) are respectively connected to both ends of the top of the V-shaped bracket (55). Guide rods (57) are respectively connected to both ends of the bottom of the V-shaped bracket (55). The V-shaped bracket (55) is connected to the mounting bracket (51) through a pin shaft and penetrates through the guiding groove (54). An arc-shaped opening (58) corresponding to the guide rod (57) is formed on the driving plate (53). The guide rods (57) are respectively located in the corresponding arc-shaped openings (58). The arc-shaped opening (58) is adapted to guide the V-shaped bracket (55) to tilt and rotate. The bottom end of the top guide rail (4) is located between the limiting wheels (56) and is in rolling contact with them. A driving block (59) is connected to the driving plate (53). The driving block (59) is located in the limiting opening (52) and its bottom end is located below the limiting opening (52). A driving screw (5a) penetrates through one side of the mounting bracket (51). The driving screw (5a) is in threaded connection with the driving block (59). The driving screw (5a) is disposed close to the closing strip plate (7).

5. A kind of aluminum alloy window with a sealing structure according to claim 1, characterized in that, Clamping wires (12) are symmetrically formed in the two side slots (3) of the window sash (2). Elastic L-shaped clamping strips (13) are symmetrically formed on one side of the closing strip plate (7) close to the window sash (2). The elastic L-shaped clamping strips (13) are respectively clamped into the clamping wires (12).

6. The aluminum alloy window with a sealing structure according to claim 1, characterized in that, Brush strips (14) are symmetrically mounted at the top and bottom of the window sash (2).

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