Synchronous tightening mechanism and safety seat

Abstract

The utility model discloses a synchronous tightening mechanism and a safety seat, the synchronous tightening mechanism comprises a tightening module and an operation module, the operation module is connected with the tightening module, the tightening module comprises a rotatable tightener, and the tightener is provided with a first tightening part and a second tightening part deviating from a rotating shaft; the first tightening part and the second tightening part do not coincide in the rotating shaft direction of the tightener, the first tightening part is suitable for being connected with a first safety belt, the second tightening part is suitable for being connected with a second safety belt, and the operation module is suitable for enabling the tightener to rotate so that the first tightening part and the second tightening part can synchronously rotate. The safety belt fixing device has the advantage that the safety belt fixing effect can be improved, and when the safety belt fixing device is applied to a safety seat, the seat can be fixed more firmly, and a child can be fixed more firmly through the seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety seats, in particular to a synchronous tightening mechanism and a safety seat. BACKGROUND

[0002] A child seat is a seat designed for children of different weights (or age groups) and installed in a car, which can effectively improve the safety of children riding in the car. It is also called a safety seat. The safety seat is provided with a plurality of safety belts for fixing different objects, such as an upper pull belt provided on the top of the safety seat, also known as a TT (TOP TETHER) belt, which is used to connect with the car seat to limit the safety seat from falling over. The safety seat is provided with a plurality of point safety belts to limit and fix different parts of the child sitting on the seat.

[0003] However, the existing safety seat has the following defects: the tightening and pre-tightening operations of the safety belts of each part of the safety seat, such as the upper pull belt for fixing the seat itself, and the safety belts for fixing the child on the seat, are independently set, which is inconvenient to operate. SUMMARY

[0004] An object of the present application is to provide a synchronous tightening mechanism and a safety seat capable of simultaneously tightening different safety belts.

[0005] To achieve the above object, the technical solution adopted by the present application is as follows: a synchronous tightening mechanism, comprising a tightening module and an operation module, the operation module being connected with the tightening module, the tightening module comprising a rotatable tensioner, a first tightening part and a second tightening part being provided on the tensioner deviating from the rotation shaft, and the first tightening part and the second tightening part not coinciding with each other along the direction of the rotation shaft of the tensioner, the first tightening part being adapted to connect a first safety belt, the second tightening part being adapted to connect a second safety belt, the operation module being adapted to rotate the tensioner so that the first tightening part and the second tightening part rotate synchronously and change the relative positions between the first safety belt, the second safety belt and the rotation shaft of the tensioner.

[0006] In some embodiments, a connecting module is provided between the tightening module and the second safety belt, the connecting module comprising a pull block, the pull block being connected with the second tightening part, a handle being provided on the pull block, the pull block being adapted to be separably connected with the second safety belt through the handle.

[0007] In some embodiments, the connection module further includes a movable cavity and a resetter, the pull block and the resetter being adapted to be disposed within the movable cavity, the bottom of the pull block being adapted to connect to a second tightening portion, the handle being disposed at the top of the pull block, the handle being adapted to restrict the second seat belt from disengaging in the reset direction of the resetter, and the resetter being adapted to move the top of the pull block toward the outlet of the movable cavity and expose the handle to the outside of the movable cavity.

[0008] In some embodiments, the connecting module further includes a connecting strap, which is a flexible structure. One end of the connecting strap is connected to the second tightening part, and the other end of the connecting strap is connected to the pull block.

[0009] In some embodiments, the connecting module further includes a guide shaft disposed at the bottom of the movable cavity. The connecting belt forms a first connecting segment and a second connecting segment before and after passing through the guide shaft. The first connecting segment is connected to the second tightening part. The guide shaft is adapted to make the extension direction of the first connecting segment approach or be equal to the direction in which the first seat belt connects to the first tightening part. The second connecting segment is connected to the pull block. The guide shaft is adapted to make the extension direction of the second connecting segment approach or be equal to the movement direction of the pull block within the movable cavity.

[0010] In some embodiments, the tightener is a crankshaft structure, and the tightener bends and protrudes to both sides to form a first tightening portion and a second tightening portion; there is one first tightening portion and two second tightening portions, the first tightening portion is located in the middle of the tightener, and the two second tightening portions are symmetrically distributed on both sides of the first tightening portion; the line connecting the first tightening portion and the second tightening portion to the shaft of the tightener forms an angle of 180° within the same radial section of the tightener.

[0011] In some embodiments, the radial cross-sections of the first tightening portion and the second tightening portion are mainly circular, the axis of the first tightening portion and the axis of the second tightening portion are parallel to the axis of rotation of the tightener, the first safety belt is rotatably connected to the first tightening portion, and the second safety belt is rotatably connected to the second tightening portion.

[0012] In some embodiments, the operating module includes an operating wrench fixed to one or both ends of the tightener along the rotation axis, the operating wrench having a handle portion formed in the radial direction of the tightener; the operating module includes a locking structure adapted to be disposed between the operating wrench and the mounting position, and / or on one side of the tightening module, the locking structure being adapted to restrict the rotation of the operating wrench and / or the tightening module.

[0013] A safety seat includes a base, on which a synchronous tightening mechanism as described above is disposed, and the operating module is exposed on the side of the base.

[0014] A car seat includes a base, on which a synchronous tightening mechanism as described above is provided. The first seat belt is the upper pull strap of the car seat, and the second seat belt is the seat belt of the car seat. One end of the upper pull strap is adapted to extend into the base in a first direction and connect to the first tightening part. The first seat belt is adapted to pass through the upper surface of the base in a second direction and connect to the pull block.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: the synchronous tightening mechanism and car seat of this application can link the tightening process between two different seat belts. Through the operation of the tightener, multiple seat belts can be tightened simultaneously during the operation of the tightener, thereby realizing the tightening and pre-tensioning fixation operation of multiple seat belts. This can effectively reduce the operation process required to tighten each seat belt and improve tightening efficiency. When applied to a car seat, it can improve the fixation stability between the car seat and the vehicle seat and increase the fixation stability between the child and the car seat when riding. Attached Figure Description

[0016] Figure 1 This is an initial state view of a car seat base according to a preferred embodiment of this application.

[0017] Figure 2 This is an exploded structural view according to a preferred embodiment of this application.

[0018] Figure 3 This is a combined view of the tightening mechanism before tightening, according to a preferred embodiment of this application.

[0019] Figure 4 This is a combined view of the tightening mechanism after tightening according to a preferred embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the state of the tightener before tightening according to a preferred embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the tightener after tightening, according to a preferred embodiment of this application.

[0022] Figure 7 This is a view of the connection of the seat belt to the base of a car seat according to a preferred embodiment of this application.

[0023] Figure 8This is an internal structural view of the safety seat base with the seat belt in connection, according to a preferred embodiment of this application.

[0024] Figure 9 This is a view of the seat belt tightened on a child safety seat base according to a preferred embodiment of this application.

[0025] Figure 10 This is an internal structural view of the seat base of a car seat in the tightened seat belt state according to a preferred embodiment of this application.

[0026] Figure 11 This is a cross-sectional view of the seat belt tightening section of a car seat base according to a preferred embodiment of this application.

[0027] In the diagram: 1. Tightening module; 11. Tightener; 111. First tightening part; 112. Second tightening part; 2. Operation module; 21. Operating wrench; 211. Handle; 22. Locking structure; 3. First safety belt; 4. Second safety belt; 5. Connecting module; 51. Pull block; 511. Handle; 52. Movable cavity; 53. Resetter; 54. Connecting belt; 541. First connecting section; 542. Second connecting section; 55. Guide shaft; 6. Base. Detailed Implementation

[0028] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0030] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0032] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0033] like Figures 1 to 11 As shown, this application provides a synchronous tightening mechanism, including a tightening module 1 and an operation module 2. The operation module 2 is connected to the tightening module 1. The tightening module 1 includes a rotatable tightener 11. The tightener 11 has a first tightening part 111 and a second tightening part 112 disposed off the axis of rotation. The first tightening part 111 and the second tightening part 112 can move circumferentially along the axis of rotation of the tightener 11, respectively. At the same time, the first tightening part 111 and the second tightening part 112 do not coincide with each other along the axis of rotation of the tightener 11, that is, the positions of the first tightening part 111 and the second tightening part 112 in the radial section of the tightener 11 do not coincide, thereby generating a certain distance difference.

[0034] The first tightening part 111 is adapted to connect to the first seat belt 3, and the second tightening part 112 is adapted to connect to the second seat belt 4. The operating module 2 is adapted to rotate the tightener 11 so that the first tightening part 111 and the second tightening part 112 rotate synchronously and change the relative position between the first seat belt 3 and the second seat belt 4 and the rotating shaft of the tightener 11. When the tightener 11 rotates, by utilizing the distance difference between the first tightening part 111 and the second tightening part 112 in the radial section of the tightener 11, the first seat belt 3 can be further pulled and tightened in the connection direction between it and the first tightening part 111, and the second seat belt 4 can be further pulled and tightened in the connection direction between it and the second tightening part 112.

[0035] In this application, in order to enable the first seat belt 3 and the second seat belt 4 to tighten and loosen synchronously when the tensioner 11 rotates, the arrangement of the first tensioning part 111, the second tensioning part 112, the first seat belt 3 and the second seat belt 4 needs to satisfy the following: when the first seat belt 3 is located on the side of the first tensioning part 111 rotating clockwise, the second seat belt 4 is also located on the side of the second tensioning part 112 rotating clockwise, and vice versa.

[0036] It is understandable that if it is necessary to tighten the second seat belt 4 while loosening the first seat belt 3, or tighten the first seat belt 3 while loosening the second seat belt 4, it is only necessary to adjust the position of the first seat belt 3 relative to the first tightening part 111 and / or the position of the second seat belt 4 relative to the second tightening part 112.

[0037] like Figures 2 to 6 In the embodiment shown, the tightener 11 is a crankshaft structure. The tightener 11 bends and protrudes to both sides to form a first tightening part 111 and a second tightening part 112. The crankshaft structure is simple to manufacture, low in cost, and easy to install.

[0038] like Figures 3 to 6 In the embodiment shown, there is one first tightening part 111 and two second tightening parts 112. The first tightening part 111 is located in the middle of the tightener 11, and the two second tightening parts 112 are symmetrically distributed on both sides of the first tightening part 111, so that the two sides of the tightener 11 can be balanced by force, which can effectively improve the structural stability of the tightener 11 and reduce the probability of deformation and damage.

[0039] It is understandable that when there are multiple first seat belts 3 and / or second seat belts 4, the number of first tightening parts 111 and second tightening parts 112 can be set according to the actual situation, and the first tightening parts 111 and second tightening parts 112 are distributed symmetrically on the tightener 11 to balance the force on the tightener 11.

[0040] like Figure 5 and 6 In the illustrated embodiment, the line connecting the first tightening part 111 and the second tightening part 112 to the pivot of the tightener 11 forms an angle of 180° within the same radial section of the tightener 11. The main purpose is to maximize the tightening stroke of the first tightening part 111 and the second tightening part 112. When the angle between the connection direction between the first seat belt 3 and the first tightening part 111 and the connection direction between the second seat belt 4 and the second tightening part 112 is 180°, the first seat belt 3 can be tightened by the tightener 11 for twice the distance from the first tightening part 111 to the pivot of the tightener 11, and the second seat belt 4 can be tightened by the tightener 11 for twice the distance from the second tightening part 112 to the pivot of the tightener 11.

[0041] In some embodiments, the radial cross-sections of the first tightening part 111 and the second tightening part 112 are mainly circular. The axis of the first tightening part 111 and the axis of the second tightening part 112 are parallel to the axis of rotation of the tightener 11. The first seat belt 3 is rotatably connected to the first tightening part 111, so that while the first tightening part 111 rotates around the axis of rotation of the tightener 11, the probability of the first seat belt 3 winding around the first tightening part 111 is reduced, thereby improving the consistency and stability of each tightening. The second seat belt 4 is rotatably connected to the second tightening part 112, so that while the second tightening part 112 rotates around the axis of rotation of the tightener 11, the second seat belt 4 will not wind around the second tightening part 112, thereby improving the consistency and stability of each tightening.

[0042] It is understood that the first tightening part 111 and the second tightening part 112 include, but are not limited to, cylindrical structures. They can also be combined with existing designs to set the first tightening part 111 and the second tightening part 112 as cylindrical structures with cones at both ends of a central cylinder, etc., in order to optimize the structural strength of the first tightening part 111 and the second tightening part 112 and the connection stability between the first tightening part 111 and the first seat belt 3, and the second tightening part 112 and the second seat belt 4.

[0043] like Figures 1 to 4 In the embodiments shown in 7 to 11, a connecting module 5 is provided between the tightening module 1 and the second seat belt 4. The connecting module 5 is used to extend the connection between the tightening module 1 and the second seat belt 4, thereby improving the adaptability between the tightening module 1 and the second seat belt 4. When the arrangement of the first seat belt 3 and the second seat belt 4 is significantly different, the connecting module 5 can unify the tightening state of the first seat belt 3 and the second seat belt 4, so that the tightening module 1 can obtain the best and most stable tightening effect.

[0044] The connecting module 5 includes a pull block 51, which is connected to the second tightening part 112. The pull block 51 is provided with a handle 511. The pull block 51 is adapted to be detachably connected to the second seat belt 4 through the handle 511. It can be understood that when the second seat belt 4 is difficult to connect to the tightening module 1 in the form of an end connection, the second seat belt 4 is adapted to be fixed in the handle 511. The tightener 11 can drive the pull block 51 to move. With the movement of the pull block 51, the second seat belt 4 can also be pulled and tightened.

[0045] Understandably, handle 511 can be replaced with structures such as embedded slots or embedded channels, which can also achieve a similar fixing effect to handle 511.

[0046] like Figure 2 , 8 In the embodiments shown in 10 and 11, the connecting module 5 further includes a movable cavity 52 and a resetter 53. The pull block 51 and the resetter 53 are adapted to be disposed in the movable cavity 52. ​​The bottom of the pull block 51 is adapted to connect to the second tightening part 112. The handle 511 is disposed on the top of the pull block 51. The handle 511 is adapted to restrict the second seat belt 4 from disengaging in the reset direction of the resetter 53. The resetter 53 is adapted to move the top of the pull block 51 toward the outlet of the movable cavity 52 and expose the handle 511 to the outside of the movable cavity 52. ​​When the second tightening part 112 moves, the pull block 51 can overcome the force generated by the resetter 53 and sink into the movable cavity 52 to tighten the second seat belt 4.

[0047] In some embodiments, the resetter 53 is a spring, and a limit post is provided on the pull block 51. The spring is sleeved on the limit post to achieve a stable engagement with the pull block 51.

[0048] In some embodiments, the shape of the movable cavity 52 matches the pull block 51, and the reset block is adapted to move the pull block 51 along the depth direction of the movable cavity 52, thereby effectively improving the stability of the pull block 51 when tightening the second seat belt 4.

[0049] In some embodiments, when the resetter 53 moves the top of the pull block 51 to the outlet of the active cavity 52, the surface of the pull block 51 engages with the surface of the base 6, which can reduce the difficulty of engaging the seat belt with the handle 511 and reduce structural interference.

[0050] like Figure 2 , 8 In the embodiments shown in 10 and 11, the connecting module 5 further includes a connecting strap 54. The connecting strap 54 is a flexible structure. One end of the connecting strap 54 is connected to the second tightening part 112, and the other end of the connecting strap 54 is connected to the pull block 51. The connecting strap 54 enables the pull block 51 and the second tightening part 112 to be interconnected and linked, thereby allowing the arrangement of the pull block 51 to be more free and making it easier to adjust the orientation and position of the pull block 51.

[0051] like Figure 2 , 8 In the embodiment shown in Figure 10, the connecting module 5 further includes a guide shaft 55, which is disposed at the bottom of the movable cavity 52. ​​The connecting belt 54 forms a first connecting segment 541 and a second connecting segment 542 before and after passing through the guide shaft 55. The first connecting segment 541 is connected to the second tightening part 112. The guide shaft 55 is adapted to make the extension direction of the first connecting segment 541 approach or be equal to the direction of the first seat belt 3 connecting to the first tightening part 111. The second connecting segment 542 is connected to the pull block 51. The guide shaft 55 is adapted to make the extension direction of the first connecting segment 541 approach or be equal to the direction of the first seat belt 3 connecting to the first tightening part 111. The second connecting segment 542 is connected to the pull block 51. To make the extension direction of the second connecting section 542 approach or be equal to the movement direction of the pull block 51 in the movable cavity 52, the guide shaft 55 is used to guide the movement of the connecting belt 54, so that the linkage between the connecting belt 54 and the second tightening part 112 and the linkage between the connecting belt 54 and the pull block 51 can be smoother. It can also be understood that the guide shaft 55 turns the tightening direction of the connecting belt 54 at the pull block 51 to the movement direction of the pull block 51, so that the tightening distance of the connecting belt 54 on the pull block 51 can be maximized.

[0052] like Figures 1 to 7 In the embodiment shown in Figure 9, the operation module 2 includes an operation wrench 21, which is fixed to one or both ends of the tightener 11 along the rotation axis. When the tightener 11 is rotatably mounted on the base 6 or other structures, the operation wrench 21 can be used to rotate the tightener 11. The operation wrench 21 has a handle portion 211 formed in the radial direction of the tightener 11. The handle portion 211 is used to increase the force-bearing area and improve the force-bearing angle, thereby reducing the difficulty of operating the operation wrench 21 and improving the user experience.

[0053] In some embodiments, the operation module 2 includes a locking structure, which is adapted to be disposed between the operating wrench 21 and the mounting position, and the locking structure is adapted to restrict the rotation of the operating wrench 21 relative to the mounting position.

[0054] In some embodiments, the locking structure includes elastic structures such as flexible rubber pads and torsion springs, which use elastic deformation to fill and reset the space between the operating wrench 21 and the installation position and / or one side of the tightener 11, thereby counteracting the force of the operating wrench 21 and / or the tightener 11 rotating and resetting, thus achieving the effect of restricting the rotation of the operating wrench 21 and / or the tightener 11. It also includes fixing structures such as ratchet structures, pin structures, and limit blocks, which lock the operating wrench 21 and / or the tightener 11 by means of ratchet, pin, and limit block structures, and can lock when the operating wrench 21 and / or the tightener 11 rotates to a specified angle, thereby achieving the effect of restricting the rotation of the operating wrench 21 and / or the tightener 11.

[0055] like Figure 10 In the illustrated embodiment, the locking structure 22 is adapted to be disposed on one side of the tightener 11. It can be disposed on the base 6 in the form of reinforcing ribs, protrusions, etc., and can be designed to have a certain deformation or guiding capability, allowing the tightener 11 to pass through when tightening, and abutting against the loosening device 11 and restricting the rotation of the tightener 11 when the tightener 11 wants to loosen. The tightener 11 will rotate when tightening, for example, when the tightener 11 rotates clockwise beyond a certain angle ( Figure 10 When the center rotates approximately 180°, the tension generated by the first safety belt 3 and the connecting belt 54 on the tensioner 11 can only cause the tensioner 11 to rotate counterclockwise. At this time, the locking structure 22 is located on the path of the counterclockwise rotation of the tensioner 11 and forms a dead point by contacting and cooperating with the tensioner 11, so that the tensioner 11 can be self-locked in this position.

[0056] like Figure 1 , 7 As shown in Figure 9, this application also provides a safety seat, including a base 6, on which any of the aforementioned synchronous tightening mechanisms are provided, and an operation module 2 is exposed on the side of the base 6. Specifically, an operating wrench 21 is exposed on the side of the base 6. Further, only the handle portion 211 can be exposed on the side of the base 6. The advantage of this design is that it is convenient to operate, and the operation module 2 does not need to be located between the base 6 and the backrest, thus requiring a smaller gap between the base 6 and the backrest.

[0057] like Figures 7 to 10As shown, this application also provides another type of child safety seat, including a base 6, on which any of the aforementioned synchronous tightening mechanisms are provided. The first seatbelt 3 is the upper pull strap of the child safety seat, and the second seatbelt 4 is the seat belt of the child safety seat. One end of the upper pull strap is adapted to extend into the base 6 in a first direction and connect to the first tightening part 111. The first seatbelt 3 is adapted to pass over the upper surface of the base 6 in a second direction and connect to the pull block 51. The first direction is a vertical direction (see reference). Figure 6 The first direction is the central (x-direction), and the upper pull strap can extend upwards from the top of the chair back. The second direction is the horizontal direction (see reference). Figure 7 (in the middle y direction), the seat belt can be fixed to the handle 511 of the pull block 51 along the second direction.

[0058] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are only the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope of this application. All such changes and modifications fall within the scope of this application as claimed. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A synchronous cinching mechanism, characterized by: The tightening module and the operation module are connected, the tightening module comprises a rotatable tightener, the first tightening part and the second tightening part are arranged on the tightener deviating from the rotation axis, and the first tightening part and the second tightening part are not coincident with each other along the rotation axis direction of the tightener, the first tightening part is suitable for connecting the first safety belt, the second tightening part is suitable for connecting the second safety belt, and the operation module is suitable for rotating the tightener to rotate the first tightening part and the second tightening part synchronously and change the relative position between the first safety belt, the second safety belt and the rotation axis of the tightener.

2. A synchronous tightening mechanism as claimed in claim 1, characterized in that: The connecting module is arranged between the tightening module and the second safety belt, the connecting module comprises a pulling block, the pulling block is connected with the second tightening part, a handle is arranged on the pulling block, and the pulling block is suitable for being detachably connected with the second safety belt through the handle.

3. A synchronous tightening mechanism as in claim 2, wherein: The connecting module further comprises a movable cavity and a restorer, the pulling block and the restorer are suitable for being arranged in the movable cavity, the bottom of the pulling block is suitable for connecting the second tightening part, the handle is arranged on the top of the pulling block, the handle is suitable for limiting the second safety belt from being separated in the restoring direction of the restorer, and the restorer is suitable for making the top of the pulling block move towards the outlet of the movable cavity and expose the handle outside the movable cavity.

4. A synchronous tightening mechanism as in claim 3, wherein: The connecting module further comprises a connecting belt, the connecting belt is a flexible structure, one end of the connecting belt is connected with the second tightening part, and the other end of the connecting belt is connected with the pulling block.

5. A synchronous tightening mechanism as claimed in claim 4, characterized in that: The connecting module further comprises a guide shaft, the guide shaft is arranged at the bottom of the movable cavity, the connecting belt forms a first connecting section and a second connecting section before and after passing through the guide shaft, the first connecting section is connected with the second tightening part, the guide shaft is suitable for making the extension direction of the first connecting section approach or be equal to the direction in which the first safety belt connects the first tightening part, the second connecting section is connected with the pulling block, and the guide shaft is suitable for making the extension direction of the second connecting section approach or be equal to the movement direction of the pulling block in the movable cavity.

6. A synchronous tightening mechanism as in claim 1, wherein: The tightener is a crank structure, the tightener is bent to form the first tightening part and the second tightening part to the two sides respectively, the number of the first tightening part is one, the number of the second tightening part is two, the first tightening part is located at the middle position of the tightener, and the two second tightening parts are symmetrically distributed on the two sides of the first tightening part; and the included angle formed by the connecting line between the first tightening part, the second tightening part and the rotation axis of the tightener in the same radial section of the tightener is 180°.

7. A synchronous tightening mechanism as in claim 6, wherein: The main body shape of the radial section of the first tightening part and the second tightening part is circular, the axis of the first tightening part and the axis of the second tightening part are parallel to the rotation axis of the tightener, the first safety belt is rotatably connected with the first tightening part, and the second safety belt is rotatably connected with the second tightening part.

8. A synchronous tightening mechanism as in claim 1, wherein: The operation module comprises an operation handle, which is fixed to one end or both ends of the tightener along the rotation axis direction, and a handle part is formed on the operation handle in the radial direction of the tightener; the operation module comprises a locking structure, which is adapted to be arranged between the operation handle and the installation position, and / or one side of the tightener module, and the locking structure is adapted to limit the rotation of the operation handle and / or the tightener module.

9. A safety seat, characterized by: The seat comprises a base, and the synchronous tightening mechanism according to any one of claims 1 to 8 is arranged on the base, and the operation module is exposed on the side of the base.

10. A safety seat, characterized by: The seat comprises a base, and the synchronous tightening mechanism according to any one of claims 2 to 8 is arranged on the base, a connecting module is arranged between the tightener module and the second safety belt, the connecting module comprises a pulling block, the pulling block is connected with the second tightening part, the first safety belt is an upper pulling belt of the safety seat, the second safety belt is a safety belt of the safety seat, one end of the upper pulling belt is adapted to extend into the base in a first direction and is connected with the first tightening part, and the first safety belt is adapted to pass through the upper surface of the base in a second direction and is connected with the pulling block.

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