Base for child safety seat and safety seat

Abstract

The utility model relates to the technical field of safety seats, in particular to a base for a child safety seat and the safety seat, the base for the child safety seat comprises a base body, a rotating mechanism is arranged on the base body, and a rotating limiting mechanism and a locking mechanism are arranged between the base body and the rotating mechanism; the rotating limiting mechanism comprises a limiting assembly and an unlocking assembly, the limiting assembly is connected with the unlocking assembly, the limiting assembly is used for enabling the rotating angle of the rotating mechanism to be smaller than or equal to 180 degrees, the unlocking assembly is used for enabling the rotating mechanism to be unlimited, and the rotating mechanism can rotate by 360 degrees after being unlimited. The locking mechanism is used for rotating the rotating mechanism to a certain angle and then locking the rotating mechanism; the rotating mechanism comprises a guide rail, a support and a cover plate, the guide rail is arranged on the base, the support is rotatably connected with the guide rail, the cover plate covers the guide rail, and the support rotates to drive the cover plate to rotate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of child safety seats, and more particularly to a base for a child safety seat and a safety seat. Background Art

[0002] Child safety seats have been widely used as safety tools for children to ride in cars. When the safety seat is installed in the vehicle, in the event of a collision or sudden deceleration of the car, it can slow down the impact force on the child and restrict the movement of the child's body to reduce the harm to them, ensuring the safety of the child during the ride. Generally, the orientation of the child safety seat is in the forward direction of the car. However, for very young infants, adjusting the orientation of the child safety seat to the rearward placement can provide better protection and buffering for the child. Therefore, in recent years, there have been many rotatable child safety seats to achieve the effect of being able to be placed in both the forward and reverse directions.

[0003] The patent with the patent number 201811476884.2 discloses a 360-degree rotatable car child safety seat, including a seat body and a base. The seat body is disposed above the base, and a rotation adjustment mechanism is provided between the seat body and the base. The rotation adjustment mechanism includes a rotating shaft and a cover plate. The cover plate, the seat body and the rotating shaft are fixed together. The lower end of the rotating shaft is rotatably connected to the base to allow the seat body to rotate on the base. A locking device for locking the position of the seat body is provided between the cover plate and the base. The child safety seat in this application can conveniently realize the left-right and front-back rotation of the seat, facilitating parents to put the child into the seat or take the child out of the seat. For infants under three years old, installing the child safety seat in the rearward direction is safer, so that the child can be better protected and buffered during driving. However, for the above-mentioned child safety seat, if a collision occurs due to the rotation of the seat during driving, it will cause a large displacement and acceleration of the child's body, which is extremely likely to harm the child's head and internal organs. There are relatively large potential safety hazards. Summary of the Utility Model

[0004] Aiming at the deficiencies and existing problems of the prior art, the present disclosure provides a base for a child safety seat and a safety seat, which can limit the rotation angle of the safety seat when it is placed rearward to ensure the safety of the child.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is as follows: A base for a child safety seat, including a base, a rotating mechanism is provided on the base, a rotation limiting mechanism and a locking mechanism are provided between the base and the rotating mechanism, the rotation limiting mechanism includes a limiting component and an unlocking component, the limiting component and the unlocking component are connected, the limiting component is used to make the rotation angle of the rotating mechanism less than or equal to 180 degrees, the unlocking component is used to release the limit of the rotating mechanism, and after the rotating mechanism is released from the limit, it can rotate 360 degrees, and the locking mechanism is used to lock the rotating mechanism after it rotates to a certain angle.

[0006] As a preferred embodiment, the rotating mechanism includes a guide rail, a bracket and a cover plate, the guide rail is provided on the base, the bracket is rotatably connected to the guide rail, the cover plate covers the guide rail, and the rotation of the bracket drives the rotation of the cover plate.

[0007] As a preferred embodiment, the unlocking component includes an adjusting member, the adjusting member includes an adjusting head and a limiting rod, an elastic member is sleeved outside the limiting rod, the elastic member is used for the reset of the adjusting member, a through hole is provided on the cover plate, at least part of the adjusting head is arranged in the through hole, and pressing the adjusting head releases the limit of the rotating mechanism. Preferably, the elastic member is a spring.

[0008] As a preferred embodiment, the unlocking component further includes a first limiting column with a hollow structure, at least part of the limiting rod is located in the first limiting column, and the limiting rod is slidably connected to the first limiting column, and the elastic member is located above the first limiting column.

[0009] As a preferred embodiment, the limiting component includes a limiting structure provided on the guide rail and a positioning rod connected to the adjusting member, and the positioning rod cooperates with the limiting structure to limit the rotating mechanism, so that the rotation angle of the rotating mechanism is less than or equal to 180 degrees.

[0010] As a preferred embodiment, the limiting component further includes a second limiting column with a hollow structure, and one end of the positioning rod is arranged in the second limiting column.

[0011] As a preferred embodiment, the limiting component further includes a transmission part, the transmission part includes a support member and a transmission member, the transmission member is located above the support member and contacts the support member, two first clamping grooves are arranged at one end of the transmission member, two second clamping grooves are arranged at the other end of the transmission member, the first clamping groove is connected to the adjusting member, and the second clamping groove is connected to the positioning rod.

[0012] As a preferred embodiment, two connecting plates are extended along the direction of the limiting rod on the adjusting head, the two connecting plates are respectively located on both sides of the adjusting head, the limiting rod is located between the two connecting plates, a first connecting rod is arranged on the connecting plate, and the first clamping groove is connected to the first connecting rod.

[0013] As a preferred embodiment, two second connecting rods are provided at one end of the positioning rod outside the second limiting post. The two second connecting rods are respectively arranged on both sides of the positioning rod, and the second clamping groove is connected to the second connecting rod.

[0014] As a preferred embodiment, the transmission member is provided with a first opening groove and a second opening groove. The two first clamping grooves are respectively located on both sides of the first opening groove, and the two second clamping grooves are respectively located on both sides of the second opening groove. At least a part of the adjusting member is located in the first opening groove, and at least a part of the positioning rod is located in the second opening groove.

[0015] In some embodiments, the limiting structure is two limiting blocks, and the projection of the connection line of the two limiting blocks on the guide rail coincides with the diameter of the guide rail.

[0016] In some embodiments, the guide rail is circular ring-shaped and includes a first part and a second part. The first part and the second part respectively account for half of the guide rail. The first part is arranged in front of the base, and the second part is arranged behind the base. A stepped surface is provided at the transition between the first part and the second part, and the limiting structure is the stepped surface.

[0017] Another object of the present disclosure is to provide a safety seat, including the above-mentioned base. The cover plate is connected with a carrycot and / or a seat. One side of the seat where the backrest is provided is set as the rear side, and the side of the seat where the backrest is not provided is set as the front side. A working rod is arranged below the rear side of the seat, and the working rod is used to press the adjusting member to release the limit of the rotating mechanism.

[0018] As a preferred embodiment, it further includes support legs, and the support legs are arranged in front of the base.

[0019] Compared with existing products, since a rotation limiting mechanism and a locking mechanism are provided between the base and the rotating mechanism, the rotation limiting mechanism includes a limiting component and an unlocking component. The limiting component and the unlocking component are connected. The limiting component is used to make the rotation angle of the rotating mechanism less than or equal to 180 degrees, avoiding potential safety hazards caused by unrestricted rotation angle of the seat when the safety seat is placed backward, and making the use safer; the unlocking component is used to release the limit of the rotating mechanism. After the rotating mechanism is released from the limit, it can rotate 360 degrees. If it is necessary to rotate the rotating mechanism 360 degrees, the unlocking mechanism can be triggered. In this way, the rotating mechanism can be limited or released from the limit as needed, making the use of the safety seat more flexible. Description of the Drawings

[0020] The present application will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings are only schematic and conceptually represent the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0021] Figure 1 is one of the schematic structural diagrams of a base for a child safety seat according to the present disclosure;

[0022] Figure 2 is the present disclosure Figure 1 a partial enlarged view of part A in;

[0023] Figure 3 is another schematic structural diagram of a base for a child safety seat according to the present disclosure;

[0024] Figure 4 is the present disclosure Figure 3 a partial enlarged view of part B in;

[0025] Figure 5 is yet another schematic structural diagram of a base for a child safety seat according to the present disclosure;

[0026] Figure 6 is the present disclosure Figure 5 a partial enlarged view of part C in;

[0027] Figure 7 is a cross-sectional view of a base for a child safety seat according to the present disclosure;

[0028] Figure 8 is the present disclosure Figure 7 a partial enlarged view of part D in;

[0029] Figure 9 is a schematic structural diagram of the connection between an adjusting member and a spring according to the present disclosure;

[0030] Figure 10 is a schematic structural diagram of the connection between a transmission member and an adjusting member and a positioning rod according to the present disclosure;

[0031] Figure 11 is a schematic structural diagram of the positioning rod according to the present disclosure;

[0032] Figure 12 is a schematic structural diagram of the transmission member according to the present disclosure.

[0033] Explanation of reference numerals:

[0034] 1. Cover plate; 2. Base; 3. Support leg; 4. First limiting post; 5. Guide rail; 6. Adjusting member; 61. Limiting rod; 62. Adjusting head; 63. Connecting plate; 64. First connecting rod; 65. First convex block; 7. Elastic member; 8. Transmission member; 81. First card slot; 82. Second card slot; 83. First opening slot; 84. Second opening slot; 9. Positioning rod; 91. Second connecting rod; 92. Second convex block; 10. Second limiting post; 11. Support member; 12. First part; 13. Second part; 14. Through hole; 15. Bracket; 16. Step surface. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0036] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0037] Please refer to Figures 1 to 4As shown in the figure, a base for a child safety seat includes a base 2. A rotating mechanism is provided on the base 2. A rotation limiting mechanism and a locking mechanism are provided between the base 2 and the rotating mechanism. The rotation limiting mechanism includes a limiting component and an unlocking component. The limiting component and the unlocking component are connected. The limiting component is used to make the rotation angle of the rotating mechanism less than or equal to 180 degrees (when the backrest is in the front or rear of the base, the rotating mechanism can rotate 90 degrees to the left or right respectively). For children under three years old, it is safer to use. The unlocking component is used to release the limit of the rotating mechanism. After the rotating mechanism is released from the limit, it can rotate 360 degrees. When placing a child in the seat or taking the child out of the seat, the limit can be released to make the rotating mechanism rotate 360 degrees for convenient operation. Or for children over three years old, the limit can also be released during use to make the rotating mechanism rotate 360 degrees. The locking mechanism is used to lock the rotating mechanism after it rotates to a certain angle. When the rotating mechanism rotates to the required angle, the locking mechanism locks the rotating mechanism to keep it at this angle and unable to rotate freely. Such a setting makes the base safer during use. Specifically, the rotating mechanism includes a guide rail 5, a bracket 15 and a cover plate 1. The guide rail 5 is provided on the base 2. The bracket 15 is rotatably connected to the guide rail 5. The cover plate 1 covers the guide rail 5. The rotation of the bracket 15 drives the rotation of the cover plate 1.

[0038] As Figures 5 to 10 shown in the figure, further, the unlocking component includes an adjusting member 6 and a first limiting post 4 with a hollow structure. The adjusting member 6 includes an adjusting head 62 and a limiting rod 61. At least part of the limiting rod 61 is located in the first limiting post 4, and the limiting rod 61 is slidably connected to the first limiting post 4. A spring 7 is sleeved outside the limiting rod 61. The spring 7 is used for the reset of the adjusting member 6. The spring 7 is located above the first limiting post 4. The first limiting post 4 is used to limit the limiting rod 61 in the horizontal direction to prevent the limiting rod 61 from shaking left and right during operation. Specifically, the adjusting head 62 protrudes from the through hole 14. Press the adjusting head 62, and the limiting rod 61 slides towards the first limiting post 4. The spring 7 is squeezed between the adjusting head 62 and the first limiting post 4.

[0039] Furthermore, the limiting component includes a limiting structure disposed on the guide rail 5 and a positioning rod 9 connected to the adjusting member 6. The positioning rod 9 cooperates with the limiting structure to limit the rotation angle of the rotating mechanism to be less than or equal to 180 degrees. The limiting component further includes a second limiting post 10 with a hollow structure, and one end of the positioning rod 9 is disposed in the second limiting post 10. The second limiting post 10 is used to limit the positioning rod 9 in the horizontal direction, making the positioning rod 9 more stable and reliable during operation. The limiting component further includes a transmission part, and the transmission part includes a support member 11 and a transmission member 8. The transmission member 8 is located above the support member 11 and contacts the support member 11. Two first card slots 81 are disposed at one end of the transmission member 8, and two second card slots 82 are disposed at the other end of the transmission member 8. The first card slot 81 is connected to the adjusting member 6, and the second card slot 82 is connected to the positioning rod 9.

[0040] Please refer to Figure 11 As shown, furthermore, the adjusting head 62 extends along the direction of the limiting rod 61 with two connecting plates 63. The two connecting plates 63 are respectively located on both sides of the adjusting head 62. The connecting plates 63 are integrally formed with the adjusting head 62. The limiting rod 61 is located between the two connecting plates 63. A first connecting rod 64 is disposed on the connecting plate 63, and the first card slot 81 is connected to the first connecting rod 64. In order to make the connection between the first card slot 81 and the first connecting rod 64 more stable and prevent the first connecting rod 64 from slipping out of the first card slot 81, a first convex block 65 is disposed at the free end of the first connecting rod 64, and the size of the first convex block 65 is greater than the width of the first card slot 81. One end of the positioning rod 9 located outside the second limiting post 10 is provided with two second connecting rods 91. The two second connecting rods 91 are respectively disposed on both sides of the positioning rod 9. The second card slot 82 is connected to the second connecting rod 91. In order to make the connection between the second card slot 82 and the second connecting rod 91 more stable and prevent the second connecting rod 91 from slipping out of the second card slot 82, a second convex block 92 is disposed at the free end of the second connecting rod 91, and the size of the second convex block 92 is greater than the width of the second card slot 82.

[0041] As Figure 12 shown, furthermore, the transmission member 8 is arranged in an "H" shape. The transmission member 8 is provided with a first opening slot 83 and a second opening slot 84. The two first card slots 81 are respectively located on both sides of the first opening slot 83, and the two second card slots 82 are respectively located on both sides of the second opening slot 84. At least a part of the adjusting member 6 is located in the first opening slot 83, and at least a part of the positioning rod 9 is located in the second opening slot 84. Such an arrangement makes the structure of the rotation limiting mechanism more compact and saves space.

[0042] Preferably, the support member 11 is two support rods, which are respectively located on both sides of the transmission member 8. The support rods are provided with first working holes, and the transmission member 8 is provided with second working holes. The second working holes are arranged between the first opening groove 83 and the second opening groove 84. A hinge shaft is arranged in the first working hole and the second working hole, and the transmission member 8 is hinged to the support rod. After the transmission member 8 is hinged to the support rod, the transmission member 8 is equivalent to a "seesaw". When a downward force is applied to the side where the first opening groove 83 is provided, the side where the second opening groove 84 is provided will tilt upward, and the positioning rod 9 will be pulled out in a direction away from the second limiting column 10.

[0043] In an embodiment of the present disclosure, the limiting structure is two limiting blocks. The projection of the connection line of the two limiting blocks on the guide rail 5 coincides with the diameter of the guide rail 5, so that the two limiting blocks just divide the guide rail 5 into two semi-circular shapes. When the positioning rod is located in the guide rail 5, when the cover plate 1 rotates to the positions of the two limiting blocks to the left and right, it cannot continue to rotate, so that the cover plate 1 can rotate at most 90 degrees on the guide rail 5.

[0044] As Figure 3 and Figure 5 As shown, in an embodiment of the present disclosure, the guide rail 5 is circular ring-shaped, including a first part 12 and a second part 13. The first part 12 and the second part 13 respectively account for half of the guide rail 5. The first part 12 is arranged in front of the base 2, and the second part 13 is arranged behind the base 2. A step surface 16 is arranged at the transition between the first part 12 and the second part. The limiting structure is the step surface 16. The setting of the step surface 16 makes the height of the first part 12 greater than the height of the second part 13. When the cover plate 1 rotates to the position of the step surface 16, it is limited, so that the cover plate 1 cannot continue to rotate, and the cover plate 1 can rotate at most 180 degrees on the guide rail 5.

[0045] When using the base, press the adjusting head 62, the connecting plate 63 and the limiting rod 61 both move downward, the spring 7 is compressed, and the first connecting rod 64 drives the end of the transmission member 8 where the first card slot 81 is arranged to move downward. The end of the transmission member 8 where the second card slot 82 is arranged tilts upward, and the positioning rod 9 is pulled out in a direction away from the second limiting column 10. After the positioning rod 9 is pulled out to a certain height, the bottom of the positioning rod 9 is higher than the limiting structure. When the cover plate 1 rotates, the limiting structure no longer limits the positioning rod 9, and at this time the cover plate 1 can rotate at any angle. When the adjusting head 62 is not pressed, the spring 7 resets. Under the elastic force of the spring 7, one end of the positioning rod 9 is located in the guide rail 5. When the cover plate 1 rotates, the limiting structure limits the positioning rod 9, and the cover plate 1 can rotate at most 180 degrees on the guide rail 5.

[0046] The present disclosure also provides a safety seat, including the base described above. The cover plate 1 is connected with a carrycot and / or a seat. The side of the seat where the backrest is provided is defined as the rear side, and the side of the seat where the backrest is not provided is defined as the front side. A working rod is arranged below the rear side of the seat, and the working rod is used to press the adjusting member 6 to release the limit of the rotating mechanism.

[0047] Generally, young children under three years old need to place the seat backward when using the seat (that is, install the side of the seat where the backrest is provided in the front, so that the young child sits on the seat facing the backrest of the safety seat). Children over three years old have a certain degree of autonomy and can be installed normally when installing the seat (that is, install the side of the seat where the backrest is provided in the back). After the seat is installed on the cover plate 1, the lower part of the working rod abuts against the adjusting member 6 and presses the adjusting member 6 downward, so that the positioning rod 9 disengages from the guide rail 5, and the cover plate 1 can rotate at any angle. There is no working rod arranged below the front side of the seat. When the seat is placed backward, it is necessary to manually press the adjusting member 6 so that the positioning rod 9 can disengage from the guide rail 5. Generally, the positioning rod 9 is located in the guide rail 5, and the limiting structure cooperates with the positioning rod 9 to limit the rotating mechanism. The rotation angle of the cover plate 1 is less than or equal to 180 degrees, which is safer for young children under three years old to use.

[0048] In an embodiment of the present disclosure, it further includes a support leg 3. The support leg 3 is arranged in front of the base 2 and is used to support the base 2.

[0049] The above has introduced the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A base for a child safety seat, characterized in that, It includes a base (2), a rotating mechanism is arranged on the base (2), a rotation limiting mechanism and a locking mechanism are arranged between the base (2) and the rotating mechanism. The rotation limiting mechanism includes a limiting component and an unlocking component. The limiting component and the unlocking component are connected. The limiting component is used to make the rotation angle of the rotating mechanism less than or equal to 180 degrees. The unlocking component is used to release the limit of the rotating mechanism. After the rotating mechanism is released from the limit, it can rotate 360 degrees. The locking mechanism is used to lock the rotating mechanism after it rotates to a certain angle. The rotating mechanism includes a guide rail (5), a bracket (15) and a cover plate (1). The guide rail (5) is arranged on the base (2). The unlocking component includes an adjusting part (6). The adjusting part (6) includes an adjusting head (62) and a limiting rod (61). An elastic part (7) is sleeved outside the limiting rod (61). The elastic part (7) is used for the reset of the adjusting part (6). The limiting component includes a limiting structure arranged on the guide rail (5) and a positioning rod (9) connected to the adjusting part (6). The positioning rod (9) cooperates with the limiting structure to limit the rotating mechanism, so that the rotation angle of the rotating mechanism is less than or equal to 180 degrees.

2. The base for a child safety seat according to claim 1, characterized in that, The bracket (15) is rotatably connected to the guide rail (5), the cover plate (1) covers the guide rail (5), and the rotation of the bracket (15) drives the rotation of the cover plate (1).

3. The base for a child safety seat according to claim 2, characterized in that, A through hole (14) is arranged on the cover plate (1). At least part of the adjusting head (62) is arranged in the through hole (14). Pressing the adjusting head (62) releases the limit of the rotating mechanism.

4. The base for a child safety seat according to claim 3, characterized in that, The unlocking component further includes a first limiting column (4) with a hollow structure. At least part of the limiting rod (61) is located in the first limiting column (4), and the limiting rod (61) is slidably connected to the first limiting column (4). The elastic part (7) is located above the first limiting column (4).

5. The base for a child safety seat according to claim 4, characterized in that, The limiting component further includes a second limiting column (10) with a hollow structure. One end of the positioning rod (9) is arranged in the second limiting column (10).

6. The base for a child safety seat according to claim 5, characterized in that, The limiting component further includes a transmission part. The transmission part includes a support part (11) and a transmission part (8). The transmission part (8) is located above the support part (11) and contacts the support part (11). Two first clamping grooves (81) are arranged at one end of the transmission part (8), and two second clamping grooves (82) are arranged at the other end of the transmission part (8). The first clamping groove (81) is connected to the adjusting part (6), and the second clamping groove (82) is connected to the positioning rod (9).

7. The base for a child safety seat according to claim 6, characterized in that, Two connecting plates (63) extend along the direction of the limiting rod (61) from the adjusting head (62). The two connecting plates (63) are respectively located on both sides of the adjusting head (62). The limiting rod (61) is located between the two connecting plates (63). A first connecting rod (64) is arranged on the connecting plate (63). The first clamping groove (81) is connected to the first connecting rod (64).

8. The base for a child safety seat according to claim 6, characterized in that, Two second connecting rods (91) are arranged at the end of the positioning rod (9) outside the second limiting column (10). The two second connecting rods (91) are respectively arranged on both sides of the positioning rod (9). The second clamping groove (82) is connected to the second connecting rod (91).

9. The base for a child safety seat according to claim 6, characterized in that, The transmission part (8) is provided with a first open slot (83) and a second open slot (84). Two first clamping slots (81) are respectively located on both sides of the first open slot (83), and two second clamping slots (82) are respectively located on both sides of the second open slot (84). The adjusting part (6) is at least partially located in the first open slot (83), and the positioning rod (9) is at least partially located in the second open slot (84).

10. The base for a child safety seat according to claim 4, characterized in that, The limiting structure is two limiting blocks, and the projection of the connection line of the two limiting blocks on the guide rail (5) coincides with the diameter of the guide rail (5).

11. The base for a child safety seat according to claim 4, characterized in that, The guide rail (5) is circular ring-shaped and includes a first part (12) and a second part (13). The first part (12) and the second part (13) respectively account for half of the guide rail (5). The first part (12) is arranged in front of the base (2), and the second part (13) is arranged behind the base (2). A step surface (16) is arranged at the transition between the first part (12) and the second part (13), and the limiting structure is the step surface (16).

12. A safety seat, characterized in that, It includes the base according to any one of claims 1 to 11. The cover plate (1) is connected with a basket and / or a seat. The side of the seat where the backrest is provided is set as the rear side, and the side of the seat where the backrest is not provided is set as the front side. A working rod is arranged below the rear side of the seat, and the working rod is used to press the adjusting part (6) to release the limit of the rotating mechanism.

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