CN218563427U - Assembled folding window frame - Google Patents

Abstract

The utility model relates to a folding window technical field especially relates to an assembled folding window frame. The folding window frame comprises two fixing frames and a plurality of window bodies, wherein the two fixing frames are respectively provided with a fixed sliding rail, two ends of each window body are respectively provided with a fulcrum shaft, and the two fulcrum shafts are respectively arranged in the two fixed sliding rails; the folding structure comprises a folding strip, the folding strip comprises a plurality of connecting rods which are sequentially connected, and the end parts of the connecting rods are rotatably connected with the end parts of the adjacent connecting rods; the connecting rods are perpendicular to the axial direction of the fulcrum shafts, and the connecting rods are respectively connected with the fulcrum shafts of the window bodies. In this application, adopt folding strip with a plurality of window forms linkage together, the fixed slide rail of cooperation simultaneously uses for operating personnel rotates through the one end of controlling folding strip, can control folding and the expansion of folding strip, thereby once only folding or expansion a plurality of window forms, operating procedure is simple effective.

Description

Assembled folding window frame

Technical Field

The utility model relates to a folding window technical field especially relates to an assembled folding window frame.

Background

The window is an essential part in building construction and consists of three parts, namely a window frame, glass and movable members (hinges, handles, pulleys and the like). The existing windows are in a variety of types, and the windows used in many houses are frequently flat doors and windows, sliding windows or folding windows. The folding window is a window which is opened by a plurality of window sashes connected by hinges (hinges) in a folding and moving mode along the horizontal direction, and has the advantages of saving space, increasing ventilation and illumination and the like. However, folded windows also have significant disadvantages: 1. the space required for opening and closing the window is too large; 2. the window can only be fully opened or closed, and the opening angle cannot be adjusted like a common window due to the excessive frames.

The patent document with the publication number of CN203441298U discloses a folding window, which comprises a window frame and at least one folding window sash installed in the window frame, wherein the folding window sash comprises two window sash single bodies hinged together, a sliding mechanism capable of rotating relative to the window sash single bodies is arranged on each window sash single body, a guide rail is arranged on the window frame, and the sliding mechanism moves in the guide rail to fold the folding window sash.

In this application, if set up the folding casement of polylith, when folding, need the manual work to promote folding casement one by one, there is the problem that the operation is miscellaneous.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the above problem, a folding window frame of assembled is provided.

The technical scheme of the utility model for solving the problems is to provide an assembled folding window frame, which comprises two parallel fixing frames and a plurality of window bodies arranged between the two fixing frames, wherein the two fixing frames are respectively provided with a fixed slide rail, two ends of the window bodies are respectively provided with a support shaft, and the two support shafts are respectively arranged in the fixed slide rails of the two fixing frames in a rotatable and slidable way; the folding structure is used for controlling the plurality of window bodies to slide and fold together, the folding structure comprises folding strips, each folding strip comprises a plurality of connecting rods which are connected in sequence, and the end parts of the connecting rods are rotatably connected with the end parts of the adjacent connecting rods; the connecting rods are perpendicular to the axial direction of the fulcrum shafts, and the connecting rods are respectively connected with the fulcrum shafts of the window bodies.

Preferably, the connecting rod is rotatably connected to the support shaft.

As the utility model discloses a preferred, the center of connecting rod is equipped with the adapter sleeve, the adapter sleeve with the fulcrum rotation is connected.

As a preferred aspect of the present invention, the folding structure further includes a folding control handle, the fixing frame is provided with a first fixing shaft parallel to the supporting shaft, the middle portion of the folding control handle is connected to the first fixing shaft in a rotating manner, one end of the folding control handle forms a folding connecting end and is connected to the folding strip in a rotating manner, and the other end forms a folding control end.

As a preference of the utility model, the folding control handle include with first fixed axle rotates the connecting portion of connecting, is located resistance portion between connecting portion and the folding link end, be located power portion between connecting portion and the folding control end, the length of power portion is greater than the length of resistance portion.

As the optimization of the utility model, the end part of the connecting rod is provided with a lantern ring, and the lantern rings of two adjacent connecting rods are sleeved on a shaft body; at least one of the two lantern rings on one shaft body is in rotating connection with the shaft body.

Preferably, a sleeve is sleeved outside the shaft body, and an arc-shaped strip hole is formed in the side surface of the sleeve; the connecting rod with be equipped with the gag lever post between the lantern ring, the one end of gag lever post is located outside the sleeve, with the connecting rod is connected, and the other end passes arc strip hole gets into in the sleeve, with the lantern ring is connected.

Preferably, the support shaft coincides with a central axis of the window body.

As the utility model discloses a preferred, be equipped with the slider in the fixed slide rail, the counter roll with the slider rotates to be connected.

As a preferred aspect of the present invention, the folding structure includes two folding strips.

The utility model has the advantages that:

1. in this application, adopt folding strip with a plurality of window forms linkage together, the fixed slide rail of cooperation simultaneously uses for operating personnel rotates through the one end of controlling folding strip, can control folding and the expansion of folding strip, thereby once only folding or expansion a plurality of window forms, operating procedure is simple effective.

2. In this application, rotate window form and connecting rod and be connected for the use of folding strip does not influence every window form and rotates alone to open and shut, has improved the flexibility that opens and shuts of window form.

Drawings

FIG. 1 is a schematic view of a perspective view of a fabricated folding window frame;

FIG. 2 is a schematic view of an alternative view of a fabricated folding window frame;

FIG. 3 is a front view of the connection between the connecting rods in an assembled folding window frame;

FIG. 4 is a top view of the connection between the connecting rods in an assembled folding window frame;

in the figure: the folding mechanism comprises a fixed frame 1, a fixed sliding rail 11, a first fixed shaft 12, a second fixed shaft 13, a window 2, a fulcrum shaft 21, a folding structure 3, a folding strip 31, a connecting rod 311, a lantern ring 311a, a limiting rod 311b, a shaft body 312, a sleeve 313 and a folding control handle 32.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

An assembled folding window frame, as shown in fig. 1, includes two parallel fixing frames 1 and a plurality of window bodies 2 arranged between the two fixing frames 1.

During actual installation, two mounts 1 are usually respectively through screw fixed mounting at the upper and lower both ends in window opening, and the length of mount 1 is unanimous with the length of the upper and lower end in window opening, is equipped with fixed slide rail 11 along length direction respectively on two mounts 1 in order to be used for installing window body 2, and fixed slide rail 11 can be the closed groove structure in track bottom, also can be the unclosed through-hole structure in track bottom, for the installation of the follow-up other structures of cooperation, this embodiment adopts the through-hole structure. Fulcrum shafts 21 are respectively arranged at the upper end and the lower end of the window body 2, the fulcrum shafts 21 are cylindrical, and the axial direction is vertical to the fixing frames 1, and when the window body is installed, the fulcrum shafts 21 at the two ends of the window body 2 are respectively inserted into the fixing slide rails 11 of the two fixing frames 1. In order to prevent the window body 2 from falling off from the two fixing frames 1, one end of the fulcrum shaft 21 is connected with the window body 2, and the other end of the fulcrum shaft passes through the fixed sliding rail 11 of the through hole structure and is provided with a stop block, and the length and the width of the stop block are both larger than the width of the fixed sliding rail 11. At this time, considering the thickness of the stop block, it is not suitable to be mounted between the fixing frame 1 and the end of the window opening tightly, and a gap should be left, so a suspension rod is usually arranged on the fixing frame 1, and the suspension rod is connected with the end of the window opening through an expansion screw.

Since the shaft 21 is cylindrical, in practice, after the shaft 21 is inserted into the fixed rail 11, the shaft 21 can directly rotate around its central axis in the fixed rail 11, and can also slide along the fixed rail 11, so that the shaft 21 can be rotatably and slidably disposed in the fixed rail 11. However, in order to improve the smoothness of the rotation and sliding, a slider may be provided in the fixed slide rail 11, a through hole may be provided in the center of the slider, and the support shaft 21 may be rotatably connected to the through hole through a rotary bearing. Under the action of the slide block, the fulcrum shaft 21 can slide smoothly, so that the window body 2 is driven to slide; the fulcrum shaft 21 can smoothly rotate under the action of the rotation bearing, thereby driving the window 2 to rotate. Alternatively, the pivot shaft 21 may be designed as a slider, and the pivot shaft 21 and the window 2 may be connected by a pivot bearing. The foregoing design is adopted in this embodiment. Based on this, when the window body 2 is rotated to the plane where the window body is located and the plane where the two fixing frames 1 are located coincide, the closing state of the window body 2 is obtained; when the window body 2 is rotated to a plane where the window body is located and the plane where the two fixing frames 1 are located form a certain included angle, the window body 2 is in an opening state, and the opening area is different according to the difference of the included angle. After the window body 2 is rotated to the plane perpendicular to the planes of the two fixing frames 1, all the window bodies 2 are overlapped together in a sliding mode, and therefore the folding of the window bodies 2 is achieved.

It can be seen that window 2 rotates around the axis of fulcrum shaft 21, and in the prior art, fulcrum shaft 21 is usually disposed above and below one side end of window 2, and in this structure, when window 2 rotates around fulcrum shaft 21, the occupied area is large because window 2 is drawn by taking the whole width of window 2 as a radius. And it also hinges the other side end of window 2 to the side end of the adjacent window in order to maintain the balance of the rotation of window 2, thereby causing the failure of opening between two windows 2. In this embodiment, fulcrum 21 sets up on the center pin extension of window form 2, and window form 2 uses half of its width to draw a circle as the radius when rotating, has reduced the position that occupies when window form 2 rotates, has also guaranteed the equilibrium when window form 2 rotates, and consequently, two adjacent window forms 2 also need not articulate, when window form 2 rotates to the plane of place and two mount 1 place planes coincide, the side of two adjacent window forms 2 butt each other can, can open between two window forms 2, improve the flexibility of windowing.

Because of the large number of windows 2, it is necessary to push windows 2 one by one to slide into superposition during a folding operation. Thus, in the present application, a folding structure 3 is also included that controls sliding of window 2.

As shown in fig. 2, the folding structure 3 comprises a folding strip 31, the folding strip 31 comprises a plurality of connecting bars 311 connected in sequence, the end of the front connecting bar 311 is rotatably connected with the end of the rear connecting bar 311, and when two adjacent connecting bars 311 rotate to be parallel to each other around the rotating connection therebetween, the two connecting bars 311 are regarded as being folded together. For example, as shown in fig. 3 and 4, two ends of the connecting rod 311 are respectively provided with a sleeve ring 311a (only one end is shown in the figures), the sleeve rings 311a of two adjacent connecting rods 311 are sleeved on a shaft body 312, in order to ensure that the two connecting rods 311 can rotate relatively, at least one of the two sleeve rings 311a on the shaft body 312 is rotatably connected with the shaft body 312, in this embodiment, both the two sleeve rings 311a are rotatably connected with the shaft body 312 through a rotating bearing. Since the following connection rod 311 needs to be connected to the window 2, it is preferable to make the two connection rods 311 be flush for the flush of the window 2, and therefore the thickness of the collar 311a is preferably smaller than that of the connection rod 311, as shown in fig. 3, the collar 311a of the left connection rod 311 is disposed at the upper part of the end part thereof, the collar 311a of the right connection rod 311 is disposed at the lower part of the end part thereof, and when the collars 311a of the two connection rods 311 are sleeved on the shaft body 312, the two connection rods 311 are flush. Further, in order to protect the connection portion between the collar 311a and the shaft body 312, a sleeve 313 may be further sleeved outside the shaft body 312, and an arc-shaped strip hole is formed in a side surface of the sleeve 313; a limiting rod 311b is arranged between the connecting rod 311 and the lantern ring 311a, one end of the limiting rod 311b is positioned outside the sleeve 313 and connected with the connecting rod 311, and the other end of the limiting rod 311b penetrates through the arc-shaped strip hole to enter the sleeve 313 and is connected with the lantern ring 311 a. When the connecting rod 311 rotates, the limiting rod 311b also rotates in the arc-shaped bar hole, and the rotating angle of the connecting rod 311 can be controlled by controlling the length of the arc-shaped bar hole.

As shown in fig. 2, when the folding strip 31 is mounted on the window 2, the control link 311 is first perpendicular to the axial direction of the fulcrum shaft 21, and then the connecting links 311 are respectively connected with the fulcrum shafts 21 at the lower end of the window 2, which may be fixedly connected or rotatably connected, but considering that the fixed connection, the folding and rotating of the window 2 cannot be performed separately, the embodiment adopts a rotating connection manner. In order to ensure stability, a connecting sleeve is generally arranged at the center of the connecting rod 311, and the connecting sleeve is rotatably connected with the fulcrum shaft 21 through a rotating bearing, and at this time, the window body 2 can rotate freely and can be driven by the folding strip 31 to slide. Meanwhile, in order to enhance the strength of the folded piece 31, two identical folded pieces 31 may be stacked one on top of the other.

When folding, need to rotate several windows 2 to the plane and the plane of two fixed mounts 1 to form a certain included angle, so that several windows 2 are overlapped together, preferably rotate to the plane and the plane of two fixed mounts 1 are perpendicular. Then, the free end of the rightmost link 311 is pushed, for example, as shown in fig. 2, the right end of the rightmost link 311 is pushed to rotate counterclockwise, and the link 311 itself rotates counterclockwise around the fulcrum shaft 21, so that the left end of the link 311 appears to move rightward and outward in position, and in cooperation therewith, the right end of the second link 311 connected thereto should also move rightward and outward. To achieve this result, the second connecting rod 311 moves rightward along the fixed rail 11 as a whole, and rotates clockwise about the fulcrum 21 to move the right end portion thereof rightward and forward. As the second connecting rod 311 moves, the window 2 connected thereto moves rightward closer to the rightmost window 2. The movement and rotation of the second connecting rod 311 drives the next connecting rod 311 to move and rotate in the same manner, thereby realizing the movement of all windows 2. The distance between the two window bodies 2 is related to the included angle between the two connecting rods 311, when the rightmost connecting rod 311 rotates counterclockwise to be perpendicular to the fixed frame 1, the second connecting rod 311 is also perpendicular to the fixed frame 1 under the driving of the second connecting rod 311, and the two connecting rods 311 are attached together, so that the two window bodies 2 are overlapped together to complete the folding of the window bodies 2.

Since the one link 311 at the outermost side is also pivotally connected to the pivot shaft 21, and the pivot shaft 21 is pivotally connected to the slider in the fixed rail 11, when the link 311 is controlled to pivot, the pivot shaft 21 is easily pivoted and easily slides in the fixed rail 11, and a rotational force is not easily applied. Therefore, the folding structure 3 further comprises a folding control handle 32, as shown in fig. 2, a first fixed shaft 12 parallel to the fulcrum shaft 21 is provided on the fixed frame 1, a middle portion of the folding control handle 32 is rotatably connected with the first fixed shaft 12 through a rotating bearing, one end of the folding control handle 32 forms a folding connection end and is rotatably connected with an end portion of a most lateral connecting rod 311 of the folding strip 31, the specific structure of the rotating connection is identical with the rotating connection structure between the two connecting rods 311, and the other end of the folding control handle 32 forms a folding control end. Since the first stationary axle 12 is stationary, it is preferable to apply a force when controlling the folding control handle 32 to rotate about the first stationary axle 12. When the folding control end of the folding control handle 32 is controlled to rotate clockwise, the folding connecting end moves rightwards and inwards, so that the connecting rod 311 at the most lateral side is driven to move rightwards and rotate anticlockwise, and then the folding operation is finished in a consistent manner. Meanwhile, in order to save labor, the folding control handle 32 includes a connection portion rotatably connected to the first fixing shaft 12, a resistance portion between the connection portion and the folding connection end, and a power portion between the connection portion and the folding control end, and the length of the power portion is set to be greater than that of the resistance portion according to the lever principle.

Because before folding, need all rotate a plurality of windows 2 earlier and all be certain contained angle with two mount 1 place planes at the plane of place, preferred make a plurality of windows 2 be parallel to each other, consequently this embodiment has still set up the integrative angle modulation structure who rotates of a plurality of windows 2 of control. The angle adjusting structure comprises an adjusting frame, the adjusting frame is provided with an adjusting slide rail parallel to the fixed slide rail 11, a plurality of connecting shafts parallel to the support shaft 21 are arranged in the adjusting slide rail, the connecting shafts are arranged in the adjusting slide rail in a rotatable and slidable mode, the connecting shafts are similar to the support shaft 21, the cylindrical connecting shafts can directly realize the rotatable and slidable mode basically, however, in order to improve the fluency, sliding blocks are also arranged in the adjusting slide rail, and the connecting rods are connected with through holes in the sliding blocks through rotating bearings. The number of the connecting shafts is consistent with that of the windows 2, and the connecting shafts are required to be connected with a plurality of fulcrum shafts 21 at the lower ends of the windows 2 through connecting swing arms respectively, and the fulcrum shafts 21 and the connecting shafts can rotate, so that the connecting swing arms are fixedly connected with the fulcrum shafts 21 and the connecting shafts. In the present embodiment, since the stopper is provided just above the fulcrum shaft 21, a part of the stopper is directly used as a connecting swing arm: the lower end of the fulcrum shaft 21 passes through the fixed slide rail 11 and then is connected with the center point of the stop block, the end of the stop block is connected with the upper end of the connecting shaft, and the part of the stop block between the end and the center point is the connecting swing arm.

Since the length of the connecting swing arm is fixed, if the adjusting bracket is moved to change the distance between the fixed slide rail 11 and the adjusting slide rail in the horizontal direction, the fulcrum shaft 21 or the connecting shaft must be rotated to fit the connecting swing arm to the distance. For example, at the beginning, the horizontal distance between the fixed slide rail 11 and the adjusting slide rail is exactly the same as the length of the connecting swing arm, and at this time, the connecting swing arm is perpendicular to the fixed slide rail 11; the adjusting slide rail is moved to reduce the horizontal distance between the fixed slide rail 11 and the adjusting slide rail, at this time, an included angle is formed between the connecting swing arm and the fixed slide rail 11, the connecting swing arm is fixedly connected with the fulcrum shaft 21, and the rotation of the connecting swing arm inevitably drives the fulcrum shaft 21 to rotate. This is utilized in the present embodiment to regulate the rotation of the fulcrum shaft 21 and thus the rotation of the window 2. In addition, considering that when the window 2 rotates to the plane coincident with the plane of the two fixed frames 1, the horizontal distance between the fixed sliding rail 11 and the adjusting sliding rail is zero, and the two sliding rails are located on the same vertical plane, when the window is installed, the adjusting sliding rail needs to be not located on the same horizontal plane with the fixed frames 1, and the adjusting sliding rail is generally located below the fixed frame 1 located below.

In order to facilitate the movement of the adjusting bracket to be controlled, the angle adjusting structure of the embodiment further comprises an angle control handle, the fixing bracket 1 is provided with a second fixing shaft parallel to the fulcrum shaft 21, a connecting sleeve is arranged in the middle of the angle control handle to be rotatably connected with the second fixing shaft through a rotating bearing, one end of the angle control handle forms an adjusting connecting end and is rotatably connected with the adjusting bracket, and the other end of the angle control handle forms an angle control end. In order to save labor, the angle control handle also comprises a connecting part which is rotationally connected with the second fixed shaft, a power part which is positioned between the connecting part and the angle control end, and a resistance part which is positioned between the connecting part and the adjusting connecting end, wherein the length of the power part is longer than that of the resistance part. Meanwhile, an included angle of 75-105 degrees, preferably an angle of 90 degrees, is formed between the power part and the resistance part. In addition, in order to ensure the stability of the adjusting bracket, second fixing shafts are respectively arranged at two ends of the fixing bracket 1, one end of the adjusting bracket is connected with one second fixing shaft through the angle control handle, the other end of the adjusting bracket is connected with the other second fixing shaft through a connecting arm, one end of the connecting arm is rotatably connected with the adjusting bracket, and the other end of the connecting arm is rotatably connected with the second fixing shaft.

Based on the structure, the installation method of the assembled folding window frame comprises the following steps:

s1, cutting the two fixing frames 1 to the length consistent with the length of the upper end and the lower end of the window opening, then fixedly connecting the two fixing frames 1 with the upper end and the lower end of the window opening respectively through screws, simultaneously controlling a gap for the stop block to insert between the fixing frames 1 and the upper end of the window opening, and controlling a gap for the stop block and the angle adjusting structure to be installed between the fixing frames 1 and the lower end of the window opening.

S2, a fulcrum shaft 21 at the lower end of the window body 2 is inserted into a central connecting sleeve of a connecting rod 311 of the folding strip 31 to form a whole.

And S3, lifting the whole body between the two fixed frames 1, respectively inserting the fulcrum shafts 21 at the two ends of the control window body 2 into the two fixed slide rails 11, and installing the folding control handle 32 of the folding structure 3 on the first fixed shaft 12 of the fixed frame 1. Then, a stop block is inserted into a gap between the fixed frame 1 and the end of the window opening, and the stop block and the fulcrum shaft 21 are fixedly connected through the end of the fixed slide rail 11.

S4, inserting an adjusting frame between the fixing frame 1 and the lower end part of the window opening, installing the angle control handle on a second fixing shaft of the fixing frame 1, and meanwhile, fixedly connecting the end part of the stop block with a connecting shaft in the adjusting frame.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. An assembled folding window frame comprises two parallel fixing frames (1) and a plurality of window bodies (2) arranged between the two fixing frames (1), wherein the two fixing frames (1) are respectively provided with a fixed slide rail (11), two ends of each window body (2) are respectively provided with a support shaft (21), and the two support shafts (21) are respectively rotatably and slidably arranged in the fixed slide rails (11) of the two fixing frames (1); the method is characterized in that: the foldable window is characterized by further comprising a folding structure (3) for controlling the plurality of window bodies (2) to slide and fold together, wherein the folding structure (3) comprises a folding strip (31), the folding strip (31) comprises a plurality of connecting rods (311) which are connected in sequence, and the end part of each connecting rod (311) is rotatably connected with the end part of the adjacent connecting rod (311); the connecting rods (311) are perpendicular to the axial direction of the fulcrum shafts (21), and the connecting rods (311) are respectively connected with the fulcrum shafts (21) of the window bodies (2).

2. A fabricated folding window frame, according to claim 1, characterized in that: the connecting rod (311) is rotatably connected with the fulcrum shaft (21).

3. A fabricated folding window frame according to claim 2, characterized in that: the center of the connecting rod (311) is provided with a connecting sleeve, and the connecting sleeve is rotatably connected with the support shaft (21).

4. A fabricated folding window frame, according to claim 1, characterized in that: the folding structure (3) further comprises a folding control handle (32), the fixing frame (1) is provided with a first fixing shaft (12) parallel to the fulcrum shaft (21), the middle part of the folding control handle (32) is rotatably connected with the first fixing shaft (12), one end of the folding control handle (32) forms a folding connecting end and is rotatably connected with the folding strip (31), and the other end of the folding control handle forms a folding control end.

5. A fabricated folding window frame, according to claim 4, characterized in that: the folding control handle (32) comprises a connecting part rotationally connected with the first fixing shaft (12), a resistance part located between the connecting part and the folding connecting end, and a power part located between the connecting part and the folding control end, wherein the length of the power part is greater than that of the resistance part.

6. A fabricated folding window frame, according to claim 1, characterized in that: the end parts of the connecting rods (311) are provided with lantern rings (311 a), and the lantern rings (311 a) of two adjacent connecting rods (311) are sleeved on a shaft body (312); at least one of the two lantern rings (311 a) on the shaft body (312) is rotatably connected with the shaft body (312).

7. A fabricated folding window frame according to claim 6, characterized in that: a sleeve (313) is sleeved outside the shaft body (312), and an arc-shaped strip hole is formed in the side face of the sleeve (313); a limiting rod (311 b) is arranged between the connecting rod (311) and the lantern ring (311 a), one end of the limiting rod (311 b) is located outside the sleeve (313) and is connected with the connecting rod (311), and the other end of the limiting rod (311 b) penetrates through the arc-shaped strip hole to enter the sleeve (313) and is connected with the lantern ring (311 a).

8. A fabricated folding window frame, according to claim 1, characterized in that: the fulcrum shaft (21) coincides with the central axis of the window (2).

9. A fabricated folding window frame, according to claim 1, characterized in that: a sliding block is arranged in the fixed sliding rail (11), and the fulcrum shaft (21) is rotatably connected with the sliding block.

10. A fabricated folding window frame, according to claim 1, characterized in that: the folding structure (3) comprises two of the folding strips (31).

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