Synchronous opening and closing structure, support arm synchronous opening and closing hinge and double-stack support arm synchronous opening and closing hinge

Abstract

A synchronous opening and closing structure, wherein the slider is in the shape of a strip and has left and right racks facing opposite directions at both ends. The slider is slidably connected to the middle of a fixed frame, and the sliding range is limited by a stopper provided on the fixed frame. The left rotating shaft fixed to the left support arm and the right rotating shaft fixed to the right support arm are rotatably connected to the left and right sides of the fixed frame respectively, and the left and right teeth provided along the circumference of the outer surface of the left and right rotating shafts are meshed with the left and right racks respectively. It can make the support arm on the other side open and close synchronously when one side of the support arm is subjected to force, and the swing of the support arm is synchronous. The synchronous opening and closing hinge of the support arm and the synchronous opening and closing hinge of the double-stacked support arm developed based on the above support arm structure have the above advantages and the technical advantages of good installation stability, reducing the space occupied by the hinge at the installation position, and increasing the sliding range.

Description

Technical Field

[0001] The present invention relates to the field of hinges, and in particular to a synchronous opening and closing structure, and a support arm synchronous opening and closing hinge and a double-stacked support arm synchronous opening and closing hinge designed based on the synchronous opening and closing structure. Background Art

[0002] A sliding window is a type of window that is equipped with a sliding hinge, which can open and close the window sash parallel to the normal direction of the facade on which it is located. Since the entire window sash moves outward as a whole after opening, it has the advantages of being conducive to lighting and ventilation, convenient for smoke exhaust, and having a neat facade.

[0003] At present, most of the sliding windows are equipped with a number of parallel push-out sliding support hinges evenly installed around the window as the movable structure for the opening and closing of the window sash. One side of this type of hinge is a fixed hinge end of two support arms, and the overlapping position in the middle of the two support arms is pin-connected by a hinge pin. The other side is the hinge end of the slider of the two support arms installed on the inner and outer fixed frames, and constitutes the movable end. The two support arms are driven by the inner and outer sliders to cross and open along the slide groove. When this type of hinge is applied to sliding windows, it has the following two shortcomings:

[0004] The first aspect is the problem in the opening and closing process. Specifically, when the window needs to be opened and closed, it is not like a casement window panel that uses a single-axis or multi-axis hinge or friction hinge set on one side of the window as a rotating structure for rotation and opening and closing. Instead, the user uses the two handles installed in the middle of both sides of the window sash to push and pull the window sash to open and close it by arm strength. Generally, due to the structural limitations of the parallel push-out sliding support hinge, the two support arms can only make cross-opening and closing movements driven by the shorter inner and outer sliders on the same side, and there is a lack of synchronization between the two support arms when the hinge is opened and closed; therefore, when the force on both sides of the window sash is uneven, the window sash and hinge may be twisted at an uncertain angle, thereby affecting the opening and closing; and, during the user's opening and closing process, especially when opening the window sash, the sliding part limits the friendliness of the use process;

[0005] In addition, for such hinges installed on the upper and lower sides of the window sash and window frame, due to the structure of the hinge and the limitation of gravity, one side of the hinge must bear a larger weight under the gravity of the window sash when it is opened, which will cause one side of the hinge to become unstable and cause the support arm to twist. In serious cases, it will cause deformation or breakage of components such as the support arm and hinge pin.

[0006] The second aspect is the application range of the hinge. Specifically, since the support arm of the parallel push-out sliding support hinge is an X-shaped structure, when the outward movement of the window sash needs to be extended, the length of the support arm needs to be extended. In this case, a small-area horizontal sliding window will not be able to provide sufficient outward movement of the window sash due to the small width of the window frame installation position, and thus cannot provide sufficient ventilation, air permeability, smoke exhaust and other functions.

[0007] The third aspect is the problem of hinge component design. Specifically, in order to maximize the synchronization of the inner and outer single slider hinges when the sliding window is opened and closed, and to reduce the disadvantage of unilateral instability, it is necessary to set the sliding grooves of four sets of parallel push-out sliding support hinges in pairs on the left and right and on the top and bottom in the same direction. Therefore, the sliding window needs to have two sets of hinges that are mirror images of each other between the top and the bottom and between the left and right. For the manufacturer, the production cost of the mold is increased; and for the sliding window with a smaller window sash area, it is impossible to provide sufficient installation positions for the four sets of parallel push-out sliding support hinges in pairs on the left and right and on the top and bottom. Summary of the invention

[0008] The object of the present invention is to provide a synchronous opening and closing structure, which can make the support arm on one side to swing synchronously when the support arm on one side is subjected to force, and the swing of the support arm has synchronization.

[0009] To achieve the above purpose, the present invention is implemented by the following technical means:

[0010] A synchronous opening and closing structure, which includes a fixed frame, a left support arm, a right support arm, and a slider, characterized in that: the slider is strip-shaped and has left and right racks facing oppositely arranged at both ends, the slider is slidably connected to the middle part of the fixed frame, and the sliding range is limited by a stopper arranged on the fixed frame; a left rotating shaft fixed to the left support arm and a right rotating shaft fixed to the right support arm are correspondingly connected to the left and right sides of the fixed frame for rotation, and a left tooth portion and a right tooth portion arranged along the circumference of the outer surface of the left rotating shaft and the right rotating shaft are correspondingly meshed with the left rack and the right rack.

[0011] Furthermore, the fixed frame is composed of an upper frame plate, a lower frame plate, a left support, and a right support which are fixed to each other. A sliding cavity formed by the upper frame plate, the lower frame plate, the left support, and the right support is arranged in the middle of the fixed frame, and the sliding block is arranged in the sliding cavity and slides left and right along the sliding cavity; the stopping portion is arranged on the left support and the right support.

[0012] Furthermore, the upper frame and the lower frame cover and fix the left support and the right support, and the left rotation axis and the right rotation axis are rotatably connected to the left support and the right support via the two sides of the upper frame and / or the lower frame.

[0013] Furthermore, the inner sides of the left rack and the right rack are correspondingly provided with a left guide bar and a right guide bar, and the left support and the right support are correspondingly provided with a left guide protrusion and a right guide protrusion, and the left guide protrusion and the left guide bar are opposite to the side wall, and the right guide protrusion and the right guide bar are opposite to the side wall to guide the sliding block to slide along the sliding cavity; the left guide protrusion and the right guide protrusion serve as the first stop part to limit the sliding amplitude of the left guide bar base moving to the left and the right guide bar base moving to the right.

[0014] Furthermore, the left end of the left support is convex to form a left stop protrusion, and the right end of the right support is convex to form a right stop protrusion; the left stop protrusion and the right stop protrusion serve as the second stop part to limit the sliding range of the left rack moving leftward and the right rack moving rightward.

[0015] Furthermore, a left fixing hole and a right fixing hole are provided, wherein the left fixing hole passes through the upper frame, the lower frame, the left support and / or is provided on the left support; the right fixing hole passes through the upper frame, the lower frame, the right support and / or is provided on the right support.

[0016] Furthermore, the left tooth portion and the right tooth portion are correspondingly arranged on the outer surfaces of the left rotating shaft and the right rotating shaft via gears or gear plates.

[0017] Furthermore, the slider is formed by a left sub-slider and a right sub-slider being fixed together.

[0018] Through the synchronous opening and closing structure provided by the present setting scheme, when there is no linkage structure in the left support arm, the middle part of the right support arm and the movable end, during the opening and closing process of one support arm, the meshing structure of the tooth part and the rack can make the slider slide along the fixed frame, and the rack on the other side drives the tooth part, thereby driving the support arm on the other side to maintain synchronous opening and closing swing, with excellent synchronization, and reducing the adverse effects of the two support arms being subjected to deviation force; at the same time, it is arranged in the middle part of the fixed frame to provide sufficient installation positions for larger-sized sliders to be installed. Compared with the hinges of existing smaller-sized sliders, it can better eliminate the biased sliding of the slider during the sliding process. This structure can be used as a stable synchronous movable component, and is applied to products such as sliding windows and ventilation windows.

[0019] Another object of the present invention is to provide a support arm synchronous opening and closing hinge, which has the above-mentioned synchronous opening and closing structure. Specifically, by using a gasket ring, increasing the installation height of one side of the support arm, adopting a bending step and other setting schemes, the swinging sides of the left support arm and the right support arm are not located in the same plane, so that the left support arm and the right support arm can overlap and close with each other.

[0020] Through the synchronous opening and closing hinge of the support arm of this setting scheme, the left support arm and the right support arm have good synchronization and eliminate the deviation force. Under the condition of using a fixed frame of the same width, the maximum expansion range can be increased and the stability of the maximum expansion range can be improved.

[0021] Furthermore, the present invention also provides a double-stack support arm synchronous opening and closing hinge, which has two sets of the above-mentioned support arm synchronous opening and closing hinges, and the second support arm synchronous opening and closing hinge is symmetrically arranged relative to the first support arm synchronous opening and closing hinge; the right support arm end of the first support arm synchronous opening and closing hinge is hinged to the right support arm end of the second support arm synchronous opening and closing hinge, and the left support arm end of the first support arm synchronous opening and closing hinge is raised and hinged to the left support arm end of the second support arm synchronous opening and closing hinge through a gasket ring, so that the left support arm of the first support arm synchronous opening and closing hinge, the right support arm of the first support arm synchronous opening and closing hinge, the left support arm of the second support arm synchronous opening and closing hinge, and the right support arm of the second support arm synchronous opening and closing hinge are arranged from bottom to top.

[0022] The double-stacked support arm synchronous opening and closing hinge provided by the present arrangement scheme, especially when installed on a small sliding window, when the width of the installation position of the window frame and sash of the small sliding window is small, the slide groove structure of the prior art scheme is eliminated, which can greatly reduce the space occupied by the existing parallel push-out sliding support hinge at the installation position, while increasing the sliding range of the window sash, and the structure is stable, and also has excellent opening and closing synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the combined state of the synchronous opening and closing structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the decomposed state of the synchronous opening and closing structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the application of the synchronous opening and closing hinge of the support arm of the present invention;

[0026] Figure 4 It is a schematic diagram of the semi-expanded hinge of the double-stacked support arms of the present invention when opening and closing the hinge synchronously;

[0027] Figure 5 It is a schematic diagram of the fully unfolded hinge of the double-stacked support arms of the present invention;

[0028] Figure 6 It is a schematic diagram of an existing parallel push-out sliding support hinge installed on a window frame;

[0029] Figure 7 It is a schematic diagram of an existing parallel push-out sliding support hinge. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] Example 1

[0032] like Figure 1-2As shown, a support arm synchronous opening and closing hinge includes a fixing frame 1, a left support arm 31, a right support arm 32, and a sliding block, wherein:

[0033] The fixing frame 1 is composed of an upper frame piece 11, a lower frame piece 12, a left support 13, and a right support 14. The left support 13 and the right support 14 are correspondingly provided with a left guide protrusion 131 and a right guide protrusion 141. The lower ends of the left guide protrusion 131 and the right guide protrusion 141 are plugged and fixed to each other with the plug 121 of the lower frame piece 12 through a plug hole; in addition, the left end of the left support 13 convexly forms a left stop protrusion 132, and the right end of the right support 14 convexly forms a right stop protrusion 142.

[0034] The slider is arranged between the left support 13 and the right support 14. The slider is composed of two sub-slides 21 of the same structure that are engaged with each other in a centrally symmetrical manner. Specifically, Figure 1 As shown, a guide bar 26 and a rack 27 are provided on one side of the sub-slider 21, and an engaging hook 25 and a hanging plate 24 for mounting the engaging hook 25 are provided on the other side. The two sub-slider 21 are mutually engaged through the engaging hook 25 and the hanging plate 24, and the slider fixing hole 23 penetrating the engaging hook 25 and the hanging plate 24 is fixed by two tapered rivets 22. With this arrangement, the slider is strip-shaped and has left racks 27 and right racks 27' facing each other at both ends, and the inner sides of the left racks 27 and the right racks 27' correspond to the left guide bar 26 and the right guide bar 26'.

[0035] A left arc tooth piece is arranged on the outer surface of the left rotating shaft, and the left tooth portion 413 of the left arc tooth piece is arranged along the circumference of the outer surface of the left rotating shaft with the axis of the left rotating shaft as the axis; a right arc tooth piece is arranged on the outer surface of the right rotating shaft, and the right tooth portion 423 of the right arc tooth piece is arranged along the circumference of the outer surface of the right rotating shaft with the axis of the right rotating shaft as the axis;

[0036] The lower shaft portion 411 of the left rotating shaft and the lower shaft portion 421 of the right rotating shaft are installed in the lower rotating holes of the left support 13 and the lower rotating holes of the right support 14 respectively, and the left tooth portion 413 and the right tooth portion 423 are meshed with the left rack 27 and the right rack 27' respectively. At this time, the left guide protrusion 131 and the opposite side wall of the left guide bar 26, and the right guide protrusion 141 and the opposite side wall of the right guide bar 26' are arranged against the wall; the upper frame sheet 11 is covered on the left support 13 and the right support 14, and the upper shaft portion 412 of the left rotating shaft and the upper shaft portion 422 of the right rotating shaft are installed and exposed. The upper left rotating hole 111 and the upper right rotating hole 112 on both sides of the frame piece 11, at this time, the left rotating shaft and the right rotating shaft are correspondingly connected to the left and right sides of the fixed frame 1 for mutual rotation, the left support arm 31 is fixedly installed through the key surface of the shaft portion 412 of the left rotating shaft, and the right support arm 32 is fixedly installed through the key surface of the shaft portion 422 of the right rotating shaft, and at the end of the right support arm 32 near the right rotating shaft, an upper bending step 321 is adopted to enable the right support arm 32 to be mounted above the left support arm 31 when the right support arm 32 overlaps with the left support arm 31.

[0037] Based on the above settings, a first left fixing hole 133 is set to pass through the upper frame piece 11, the lower frame piece 12, and the left support 13, and a flange is set on the outer periphery of the first left fixing hole 133 to be inserted into and fixed to the left mounting hole 113 of the upper frame piece 11, and then the lower frame piece 12 and the left support 13 are locked through the first left fixing hole 133 with a first left locking screw 137; a first right fixing hole 143 is set to pass through the upper frame piece 11, the lower frame piece 12, and the right support 14, and a flange is set on the outer periphery of the first right fixing hole 143 to be inserted into and fixed to the right mounting hole 114 of the upper frame piece 11, and then the lower frame piece 12 and the right support 14 are locked through the first right locking screw 147 through the first right fixing hole 143. At this time, the upper frame sheet 11, the lower frame sheet 12, the left support 13, and the right support 14 are fixed to each other to form a fixed frame 1, and the middle part of the enclosed fixed frame forms a sliding cavity; therefore, when the support arm on either side is swung, under the meshing action of the left rack 27 and the left tooth surface, and the meshing action of the right rack 27' and the right tooth surface, the slider arranged in the sliding cavity will be guided by the left guide protrusion 131 and the opposite side wall of the left guide strip 26, and the right guide protrusion 141 and the opposite side wall of the right guide strip 26', which are arranged on the wall, so that the slider can slide left and right along the sliding cavity, and drive the synchronous opening and closing of the support arm on the other side;

[0038] When the slider slides to the leftmost side along the sliding cavity, the left guide protrusion 131 serves as the first stop portion on the left side to limit the leftward movement of the left guide bar base 261. At the same time, the left stop protrusion 132 serves as the second stop portion on the left side to limit the sliding range of the left rack end face 271 to the left. When the slider slides to the rightmost side along the sliding cavity, the right guide protrusion 141 serves as the first stop portion on the right side to limit the rightward movement of the right guide bar base 261'. At the same time, the right stop protrusion 142 serves as the second stop portion on the right side to limit the sliding range of the right rack end face 271' to the right, thereby limiting the maximum and minimum opening and closing ranges between the left support arm 31 and the right support arm 32.

[0039] Reasonably, when the first left locking screw 137 and the first right locking screw 147 are used as locking parts for installing the fixing frame 1 to the target object, the fixing frame 1 and the target object can also be fixed to each other at the same time, which can save the space occupied by the locking structure between the fixing frame 1 and the target object and play a good locking role; in addition, in order to further improve the locking effect between the fixing frame 1 and the target object, a second left fixing hole 134 is provided that passes through the left side of the upper frame piece 11 and the left stop protrusion 132, and a second right fixing hole 144 is provided that passes through the right side of the upper frame piece 11 and the right stop protrusion 142, and the second left locking screw 138 is used to fix the second left fixing hole 134 to the target object, and the second right locking screw 148 is used to fix the second right fixing hole 134 to the target object. After the hole 144 is fixed to the target object, not only can the first left locking screw 137 and the second left locking screw 138 fix the left support 13 and the left side of the upper frame 11, and the first right locking screw 147 and the second right locking screw 148 fix the right support 14 and the right side of the upper frame 11 more securely, but also when the left support 13 and the right support 14 play a guiding role on the left guide bar 26 and the right guide bar 26' of the slider, and the left first and second stopping parts and the right first and second stopping parts play a stopping role on the slider, it can further prevent the left support 13 and the right support 14 from being subjected to the deflection force and angular deviation during the guiding and stopping effects, which can effectively improve the stability during installation and the stability during use.

[0040] Example 2

[0041] like Figure 3 As shown, the support arm synchronous opening and closing hinge based on the arrangement scheme of Example 1, with the structure of upper and lower double-layer hinges, is applied to a larger sliding window.

[0042] The upper hinge adopts the same arrangement as in Example 1, and the width of the upper hinge fixing frame 50 is set to be narrower; at the same time, a first outer rail slider 521 matched with the window sash slide rail 7 is set on the swing end of the right support arm 52 of the upper hinge, and a gasket ring 512 is added to the swing end of the left support arm 51 of the upper hinge, and then a second outer rail slider 511 matched with the window sash slide rail 7 is set, so that the heights of the first outer rail slider 521 and the second outer rail slider 511 are set at the same height;

[0043] On the basis of the first embodiment, the width of the upper frame plate, the lower frame plate and the two-part slider of the lower hinge fixing frame 60 is enlarged, and locking holes for the first left locking screw 537, the second left locking screw 538, the first right locking screw 547 and the second right locking screw 548 of the upper hinge are additionally provided on the upper frame plate of the lower hinge, so that the upper frame plate of the lower hinge and the upper hinge fixing frame 50 are mutually locked and fixed;

[0044] In addition, the upper bending step structure of the lower hinge support arm is eliminated, and the end of the lower hinge left support arm 61 close to the lower hinge left rotating shaft 610 is raised by the first left gasket ring 611, and the end of the lower hinge right support arm 62 close to the lower hinge right rotating shaft 620 is raised by the first right gasket ring 621, so that the third outer rail slider 613 arranged on the swing end of the lower hinge left support arm 61 and the fourth outer rail slider 614 arranged on the swing end of the lower hinge right support arm 62 and the window sash slide rail 7 are set at the same height as the first outer rail slider 521 and the second outer rail slider 511; and the lower hinge left support arm 61 is set to be parallel to the direction of the upper hinge right support arm 52, and the lower hinge right support arm 62 is set to be parallel to the direction of the upper hinge left support arm 51, forming a Figure 3 General structure.

[0045] By this arrangement, the width of the lower hinge fixing frame 60 is greatly reduced relative to the width of the window sash slide rail 7, and when installed to the window frame of the sliding window, only a small installation position is required, which can greatly save installation space compared to the existing sliding window hinge structure; and Figure 3 When the window sash is in the unfolded structure, the support arms can form multiple stable structures with each other. At the same time, the opening and closing process of the support arms has good synchronization. When the user pushes the window sash horizontally, he is not limited to pushing both sides of the window frame at the same time. The user can apply force to the middle of the window sash, one side of the window frame, or both sides of the window frame to complete the window pushing action.

[0046] Example 3

[0047] like Figure 4-5As shown, the support arm synchronous opening and closing hinge provided based on the arrangement scheme of Example 1 adopts two sets of support arm synchronous opening and closing hinges which are folded and arranged symmetrically with each other. Specifically, in this embodiment, the support arm synchronous opening and closing hinge with the support arm located at the lower side is the first support arm synchronous opening and closing hinge, and the support arm synchronous opening and closing hinge with the support arm located at the upper side is the second support arm synchronous opening and closing hinge;

[0048] The end of the right support arm 82 of the first support arm synchronous opening and closing hinge is hinged with the end of the right support arm 92 of the second support arm synchronous opening and closing hinge, and the end of the left support arm 81 of the first support arm synchronous opening and closing hinge is raised with the end of the left support arm 91 of the second support arm synchronous opening and closing hinge via a gasket ring 90 and hinged, so that the left support arm 81 of the first support arm synchronous opening and closing hinge, the right support arm 82 of the first support arm synchronous opening and closing hinge, the left support arm 91 of the second support arm synchronous opening and closing hinge, and the right support arm 92 of the second support arm synchronous opening and closing hinge are arranged from bottom to top.

[0049] For small sliding windows, the width of the window frame and the window sash is small, which limits the installation position of the hinge. Since the parallel push-out sliding support hinge rail of the prior art will form a gap when installed on the window frame and window sash, Figure 7 The general structure inevitably occupies a large width space. If the length of the slide is shortened simply to save space, it will inevitably lead to a shortened length of the support arm, which will affect the air permeability and lighting of the horizontal sliding window. At the same time, the existing hinge is also prone to the following after being pushed horizontally. Figure 6 Generally, the support arm supports the A side of the window sash, but there is a lack of a support structure on the B side to support the window sash, which leads to instability and distortion of the support arm.

[0050] Based on the arrangement of this embodiment, when installed on a small sliding window, compared with the prior art, it can greatly save the necessary installation position occupied by the slide groove and provide a sufficient movable length of the window sash; at the same time, because the synchronous opening and closing hinges of the support arms have sufficient synchronization, the user is not limited to the choice of the sliding position when pushing the window sash; in addition, after the window sash is pushed, it can avoid the phenomenon of window sash instability and support arm distortion caused by the support arms being concentrated on one side in the prior art.

[0051] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A synchronous opening and closing structure, comprising a fixing frame, a left supporting arm, a right supporting arm, and a sliding block, characterized in that: The slider is strip-shaped and has left and right racks facing oppositely arranged at both ends. The slider is slidably connected to the middle of the fixed frame, and the sliding range is limited by the stopper arranged on the fixed frame; the left rotating shaft fixed to the left supporting arm and the right rotating shaft fixed to the right supporting arm are correspondingly rotatably connected to the left and right sides of the fixed frame, and the left and right teeth arranged along the circumference of the outer surfaces of the left and right rotating shafts are correspondingly meshed with the left and right racks; The fixing frame is composed of an upper frame sheet, a lower frame sheet, a left support, and a right support fixed to each other. The sliding cavity formed by the upper frame sheet, the lower frame sheet, the left support, and the right support is arranged in the middle of the fixing frame. The sliding block is arranged in the sliding cavity and slides left and right along the sliding cavity. The stopper is arranged on the left support and the right support. The left and right racks are provided with left and right guide bars on their inner sides respectively, and the left and right supports are provided with left and right guide bumps respectively. The left guide bumps and the right guide bumps are attached to the side wall opposite to the left guide bar, and the right guide bumps and the right guide bar are attached to the side wall opposite to the right guide bar to guide the slider to slide along the sliding cavity. The left and right guide bumps are used as first stoppers to limit the sliding range of the left guide bar base moving to the left and the right guide bar base moving to the right. The left end of the left support is convex to form a left stop convex block, and the right end of the right support is convex to form a right stop convex block; the left stop convex block and the right stop convex block serve as the second stop portion to limit the sliding range of the left rack moving leftward and the right rack moving rightward.

2. The synchronous opening and closing structure according to claim 1, characterized in that: The upper frame and the lower frame cover and fix the left support and the right support, and the left rotating shaft and the right rotating shaft are correspondingly connected to the left support and the right support through the two sides of the upper frame and / or the lower frame.

3. The synchronous opening and closing structure as claimed in claim 1 or 2, characterized in that: A left fixing hole and a right fixing hole are also provided. The left fixing hole passes through the upper frame plate, the lower frame plate, the left support and / or is provided on the left support; the right fixing hole passes through the upper frame plate, the lower frame plate, the right support and / or is provided on the right support.

4. The synchronous opening and closing structure as claimed in claim 1 or 2, characterized in that: The left tooth portion and the right tooth portion are correspondingly arranged on the outer surfaces of the left rotating shaft and the right rotating shaft via gears or gear plates.

5. The synchronous opening and closing structure as claimed in claim 1 or 2, characterized in that: The slide block is formed by a left sub-slide block and a right sub-slide block being fixedly combined with each other.

6. A support arm synchronous opening and closing hinge, characterized in that: It has a synchronous opening and closing structure as described in any one of claims 1 to 5, wherein the swing sides of the left support arm and the right support arm are not located in the same plane, and the left support arm and the right support arm can overlap and close with each other.

7. A double-stack support arm synchronous opening and closing hinge, characterized in that: It has two sets of support arm synchronous opening and closing hinges as described in claim 6, and the second support arm synchronous opening and closing hinge is symmetrically arranged relative to the first support arm synchronous opening and closing hinge; the right support arm end of the first support arm synchronous opening and closing hinge is hinged to the right support arm end of the second support arm synchronous opening and closing hinge, and the left support arm end of the first support arm synchronous opening and closing hinge is raised and hinged to the left support arm end of the second support arm synchronous opening and closing hinge through a gasket ring, so that the left support arm of the first support arm synchronous opening and closing hinge, the right support arm of the first support arm synchronous opening and closing hinge, the left support arm of the second support arm synchronous opening and closing hinge, and the right support arm of the second support arm synchronous opening and closing hinge are arranged from bottom to top.

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