Base for a child safety seat

Abstract

The application relates to a base of a child safety seat, comprising a base support, an operating assembly and an extension tube, the operating assembly comprising a locking member connected to the base support, the extension tube being provided with a plurality of locking portions along the length direction of the extension tube, the locking member being operable to lockingly engage with the locking portions so that the extension tube and the base support are locked relative to each other, and the locking member being operable to disengage from the locking portions so that the extension tube and the base support slide relative to each other. The base of the child safety seat is simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] This invention relates to the technical field of child safety seats, and in particular to a base for a child safety seat. Background Technology

[0002] To accommodate installation in different car models, child safety seats typically have an ISOFIX system or other anchoring system with a base for adjusting the seat's position. However, these bases are often complex in structure and expensive to manufacture. Summary of the Invention

[0003] Therefore, it is necessary to provide a base for a child safety seat that has a simple structure and low manufacturing cost.

[0004] One aspect of the present invention provides a base for a child safety seat, comprising: a base support, an operating component, and a telescopic tube. The operating component includes a locking member connected to the base support. The telescopic tube has a plurality of locking portions along its length. The locking member can be operated to lock into the locking portions, thereby locking the telescopic tube and the base support together. The locking member can also be operated to disengage from the locking portions, thereby allowing the telescopic tube and the base support to slide relative to each other.

[0005] In the base of the aforementioned child safety seat, a locking element in the operating assembly is connected to the base bracket. By operating the locking element, it can engage with any locking part on the telescopic tube, fixing the base bracket at a specific length position relative to the telescopic tube. When it is necessary to adjust the length of the telescopic tube extending beyond the base bracket, simply operate the locking element to disengage from the locking part, allowing the telescopic tube to slide relative to the base bracket. After the telescopic tube has slid relative to the base bracket to the desired position, the locking element can be operated to engage with another locking part on the telescopic tube, thereby adjusting the relative position of the base bracket and the telescopic tube, i.e., adjusting the length of the telescopic tube extending beyond the base bracket.

[0006] In one embodiment, the locking member is pivotally connected to the base bracket, and the locking member can be rotated to lock into the locking part, so that the telescopic tube and the base bracket are locked together. The locking member can also be rotated to disengage from the locking part, so that the telescopic tube and the base bracket slide relative to each other.

[0007] In one embodiment, the locking member is provided with a male connection portion, and the locking portion is a female connection portion that can lock and engage with the male connection portion.

[0008] In one embodiment, the locking member is provided with engaging teeth, and the locking part is an engaging hole that can cooperate with the engaging teeth.

[0009] In one embodiment, the engaging teeth have a first side and a second side along the extension direction of the telescopic tube, wherein the first side is an engaging slope inclined toward the second side.

[0010] In one embodiment, the operating component further includes an operating element that can be operated to drive the locking element to engage or disengage with the locking portion.

[0011] In one embodiment, the operating member has an operating ramp, and the operating member has a first position and a second position. When the operating member is in the first position, the operating ramp abuts against the locking member, and the operating member can be pressed to drive the locking member to rotate. When the operating member is in the second position, the operating ramp and the locking member are spaced apart.

[0012] In one embodiment, the base of the child safety seat further includes a first elastic member, the two ends of which abut against the operating member and the base bracket, respectively.

[0013] In one embodiment, the operating component includes an operating body, an operating post protruding from one side of the operating body, and a limiting hook. The operating ramp is located at the end of the operating post away from the operating body. The base support has a receiving groove for accommodating the operating component. The groove wall of the receiving groove forms a limiting boss. When the operating component is installed in the receiving groove, the limiting hook can engage with the limiting boss to restrict the operating component from moving towards the opening of the receiving groove. The two ends of the first elastic member abut against the operating body and the bottom of the receiving groove, respectively. The bottom of the receiving groove has a through hole, through which the operating post can pass and abut against the locking member.

[0014] In one embodiment, the locking member includes a first locking piece and a second locking piece that are connected to each other and arranged at a certain angle. The first locking piece is arranged along the extension direction of the telescopic tube. The second locking piece can be operated to lock the first locking piece with the locking part and to disengage the first locking piece from the locking part.

[0015] In one embodiment, the base of the child safety seat further includes a second elastic member, which is connected to both the base bracket and the locking member. The second elastic member constantly moves the locking member toward the locking part to engage with the locking part.

[0016] In one embodiment, the base of the child safety seat further includes a fixing member fixed to one side of the base bracket, and the second elastic member is connected to the fixing member and the locking member respectively, with the locking member pivotally connected to the fixing member.

[0017] In one embodiment, the base of the child safety seat further includes a guide cylinder fixed to one side of the base bracket, the guide cylinder being sleeved outside the telescopic tube, and the telescopic tube being slidable relative to the guide cylinder.

[0018] In one embodiment, the base of the child safety seat further includes a linkage rod, and the operating components are respectively provided on both sides of the base bracket. The two ends of the linkage rod are respectively fixed to the locking member of one of the operating components.

[0019] In one embodiment, the base bracket includes a first support frame, a second support frame, and a synchronizing element. The first support frame and the second support frame are spaced apart. The two ends of the synchronizing element are respectively fixed to the first support frame and the second support frame. Each of the operating components is respectively located on the side of the first support frame and the second support frame away from the synchronizing element. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the base of a child safety seat according to an embodiment of this application, in which the telescopic tube is in a relatively shortened state;

[0021] Figure 2 This is a schematic diagram of the base of a child safety seat according to an embodiment of this application, in which the telescopic tube is in a relatively extended state;

[0022] Figure 3 for Figure 1 The diagram shown is a structural schematic of the base of a child safety seat, omitting the outer casing.

[0023] Figure 4 for Figure 3 Enlarged view of point A;

[0024] Figure 5 for Figure 3 The BB cross-sectional view shows the engagement teeth mating with the engagement holes;

[0025] Figure 6 for Figure 5 Enlarged view of point C;

[0026] Figure 7 for Figure 3 The BB section view shows that the engaging teeth and engaging holes are disengaged at this point.

[0027] Figure 8 for Figure 7 Enlarged view of point D;

[0028] Figure 9 for Figure 3The diagram shows the structure of the control components in the base of a child safety seat.

[0029] Figure 10 for Figure 1 A bottom view.

[0030] Explanation of reference numerals in the attached figures

[0031] 10. Base body; 11. Base shell; 12. Base bracket; 12a. First support frame; 12b. Second support frame; 12c. Synchronizing component; 13. Fixing rod; 20. Telescopic mechanism; 100. Operating component; 111. Fixing component; 112. Guide tube; 102. Locking component; 211. First locking piece; 212. Second locking piece; 213. Engaging tooth; 213a. First side; 213b. Second side; 103. Operating component; 310. Operating ramp; 320. Operating body; 321. Pressing surface; 330. Operating column; 340. Limiting hook; 30. Telescopic tube; 31. Engaging hole; 400. First elastic component; 500. Second elastic component; 600. Linking rod; 40. Anchoring component; M. First end; N. Second end. Detailed Implementation

[0032] like Figures 1 to 4 As shown, one embodiment of the present invention provides a base for a child safety seat, including a base body 10, a telescopic mechanism 20 for an ISO-FIX anchoring assembly 40, and a telescopic tube 30. This child safety seat base has a simple structure and low manufacturing cost.

[0033] Specifically, such as Figure 3 As shown, the base body 10 is generally located below the seat (not shown in the attached figure) and is used to support the seat. The base body 10 includes a base shell 11, a base bracket 12 and a fixing rod 13. The base bracket 12 is located inside the base shell 11 and the fixing rod 13 is fixed to the bottom of the base shell 11.

[0034] Optionally, such as Figure 3 As shown, the base bracket 12 includes a first support frame 12a and a second support frame 12b spaced apart, and a synchronizing member 12c connected and fixed between the first support frame 12a and the second support frame 12b, that is, both ends of the synchronizing member 12c are fixed to the first support frame 12a and the second support frame 12b respectively. Optionally, the first support frame 12a, the second support frame 12b and the synchronizing member 12c are all elongated structures and made of steel. Of course, in other embodiments, the first support frame 12a, the second support frame 12b and the synchronizing member 12c can also be of other shapes and materials.

[0035] Specifically, such as Figures 2 to 3As shown, the telescopic mechanism 20 includes an operating component 100, a first elastic element 400, a second elastic element 500, and a connecting rod 600.

[0036] The operating component 100 includes a fixing member 111, a guide cylinder 112, a locking member 102, and an operating member 103.

[0037] In this embodiment, as Figure 3 As shown, preferably, operating components 100 are respectively provided on both sides of the base bracket 12. The fixing member 111 of each operating component 100 is fixed to the side of the first support frame 12a and the second support frame 12b away from the synchronization member 12c, that is, each fixing member 111 is fixed to the opposite outer side of the first support frame 12a and the second support frame 12b. The guide cylinder 112 of each operating component 100 is fixed to the side of the first support frame 12a and the second support frame 12b away from the synchronization member 12c, that is, each guide cylinder 112 is fixed to the opposite outer side of the first support frame 12a and the second support frame 12b. In this embodiment, the cross-section of the guide cylinder 112 is a non-circular structure, for example, a near-square structure. The guide cylinder 112 and the fixing member 111 located on the same side are arranged along the extending direction of the first support frame 12a or the second support frame 12b. Optionally, as... Figure 4 As shown, the guide cylinder 112 is located in front of the fixing member 111 and above the fixing member 111. The bottom surface of the fixing member 111 is connected to the top surface of the guide cylinder 112.

[0038] In this embodiment, as Figure 3 As shown, the telescopic tube 30 is used to connect the anchoring assembly 40, and the locking member 102 is connected to the base bracket 12. In this embodiment, the locking member 102 is pivotally connected to the base bracket 12. Of course, in other embodiments, the locking member 102 can also be slidably connected to the base bracket 12. The telescopic tube 30 has multiple locking parts along its length. The locking member 102 can be operated, for example, rotated, to lock into the locking part, so that the telescopic tube 30 and the base bracket 12 are locked together. The locking member 102 can also be operated, for example, rotated, to disengage from the locking part, so that the telescopic tube 30 and the base bracket 12 slide relative to each other.

[0039] Thus, by operating the locking element 102, the relative position of the base bracket 12 and the telescopic tube 30 can be adjusted. Figure 1 and Figure 2 As shown, the base bracket 12 includes a first end M and a second end N, for example, corresponding to respectively Figure 1 and Figure 2At the leftmost and rightmost ends, the fixing rod 13 is fixed to the first end M of the base bracket 12, and the telescopic tube 30 can be moved to extend to the second end N. When the child safety seat is installed and fixed in the vehicle, the length of the telescopic tube 30 extending beyond the second end N of the base bracket 12 can be adjusted by adjusting the relative position of the telescopic tube 30 and the base bracket 12, that is, adjusting the length of the anchoring assembly 40 extending beyond the second end N of the base bracket 12, thereby adapting to the connection and fixing requirements of different vehicle models. The base structure of the above-mentioned child safety seat is simple and has low manufacturing cost.

[0040] Furthermore, such as Figure 4 As shown, the locking member 102 includes a first locking piece 211 and a second locking piece 212 that are connected to each other and arranged at a certain angle. The first locking piece 211 and the second locking piece 212 can be perpendicular to each other, forming an "L" shape. The first locking piece 211 is arranged along the extension direction of the telescopic tube 30, and the second locking piece 212 can be operated, for example, rotated, so that the first locking piece 211 is locked with the locking part, and the second locking piece 212 can be operated, for example, rotated, so that the first locking piece 211 is disengaged from the locking part. In this embodiment, the locking member 102 is located above the guide cylinder 112, and the end of the first locking piece 211 away from the second locking piece 212 extends into the fixing member 111, and the first locking piece 211 is pivotally connected to the side wall of the fixing member 111.

[0041] Furthermore, such as Figure 4 As shown, the telescopic tube 30 passes through the guide cylinder 112, that is, the guide cylinder 112 is sleeved outside the telescopic tube 30, and the telescopic tube 30 can slide relative to the guide cylinder 112. In this way, the guide cylinder 112 can guide the movement direction of the telescopic tube 30 and prevent the telescopic tube 30 from deviating from the movement direction during sliding. In this embodiment, the direction from the first end M to the second end N is considered rearward, and the direction from the second end N to the first end M is considered forward. This movement direction is either moving forward or moving backward.

[0042] Furthermore, the locking member 102 is provided with a male connecting part, and the locking part is a female connecting part that can lock and engage with the male connecting part. In this embodiment, as shown... Figure 6 and Figure 8As shown, the locking member 102 may be provided with engaging teeth 213, which are specifically provided on the first locking piece 211. The locking part is an engaging hole 221 that can cooperate with the engaging teeth 213. The locking between the base bracket 12 and the telescopic tube 30 is achieved by the cooperation of the engaging teeth 213 and the engaging hole 221. The structure is simple and easy to implement. The engaging teeth 213 have a first side surface 213a and a second side surface 213b along the extension direction of the telescopic tube 30. The first side surface 213a is an engaging slope that is inclined towards the second side surface 213b. In this embodiment, the first side surface 213a is located behind the second side surface 213b. When it is necessary to move the telescopic tube 30 forward of the base bracket 12, that is, shorten the length of the second end N of the telescopic tube 30 extending out of the base bracket 12 (hereinafter referred to as the extension length), it is not necessary to operate the locking member 102. The telescopic tube 30 can be directly pushed forward of the base bracket 12. The operation is simple, time-saving and labor-saving. Of course, the first side 213a can also be located in front of the second side 213b. In this case, when it is necessary to move the telescopic tube 30 to the rear of the base bracket 12, that is, to extend the extension length of the telescopic tube 30, there is no need to operate the locking member 102. The telescopic tube 30 can be pushed directly to the rear of the base bracket 12.

[0043] Of course, in other embodiments, the locking member 102 may also be provided with a locking boss, and the locking part may be a locking groove that can cooperate with the locking slot. In short, as long as the locking member 102 and the locking part can be locked together, there is no limitation.

[0044] Furthermore, such as Figure 4 As shown, the operating member 103 can be operated to drive the locking member 102 to rotate to engage with or disengage from the locking part. For details, please refer to [link to relevant documentation]. Figure 9 The operating member 103 has an operating ramp 310. The operating member 103 has a first position and a second position. When the operating member 103 is in the first position, the operating ramp 310 abuts against the locking member 102, and the operating member 103 can be pressed to drive the locking member 102 to rotate. When the operating member 103 is in the second position, the operating ramp 310 and the locking member 102 are spaced apart.

[0045] Specifically, such as Figure 4 and Figure 9As shown, the operating component 103 includes an operating body 320, an operating post 330 protruding from one side of the operating body 320, and a limiting hook 340. In this embodiment, limiting hooks 340 are provided on both sides of the operating post 330. Of course, in other embodiments, the number and position of the limiting hooks 340 can be adjusted as needed. The side of the operating body 320 facing away from the operating post 330 and the limiting hooks 340 forms a pressing surface 321 for the user to press. An operating ramp 310 is provided at the end of the operating post 330 away from the operating body 320. The base bracket 12 is provided with a receiving groove (not shown in the figure) for accommodating the operating component 103. The groove wall of the receiving groove forms a limiting boss (not shown in the figure). When the operating component 103 is installed in the receiving groove, the limiting hook 340 can engage with the limiting boss to restrict the movement of the operating component 103 towards the opening of the receiving groove. The bottom of the receiving groove has a through hole (not shown in the figure), through which the operating post 330 can pass and abut against the locking member 102. In this way, on the one hand, the operating member 103 can be restricted from coming out of the groove of the receiving groove, and on the other hand, it does not prevent the operating member 103 from being pressed towards the bottom of the receiving groove so that the operating slope 310 of the limiting hook 340 can abut against the locking member 102. By rotating the operating member 103, the operating slope 310 can push the locking member 102 to rotate, so that the locking member 102 can engage or disengage with the locking part.

[0046] Furthermore, such as Figure 4 As shown, the two ends of the first elastic element 400 abut against the operating member 103 and the base bracket 12, respectively. Specifically, the two ends of the first elastic element 400 abut against the operating body 320 and the bottom of the receiving groove, respectively. The first elastic element 400 causes the operating member 103 to have a constant tendency to move towards the opening of the receiving groove. When a certain external force is applied to the pressing surface 321 of the operating member 103, the operating member 103 can overcome the elastic force of the first elastic element 400 and move towards the bottom of the groove, so that the operating post 330 passes through the through hole and abuts against the locking member 102, specifically, the operating post 330 abuts against the second locking piece 212. Pressing the operating post 330 causes the operating inclined surface 310 at one end of the operating post 330 to push the locking member 102 to rotate, causing the engaging teeth 213 on the first locking piece 211 to disengage from any engaging hole 221, such as... Figure 7 and Figure 8 As shown. Figure 5 and Figure 6 As shown, after the length adjustment of the telescopic tube 30 is completed and the engaging tooth 213 re-engages and locks with the other engaging hole 221, the external force applied to the pressing surface 321 is removed. The operating component 100 then resets under the elastic force of the first elastic element 400. After resetting, the operating component 100 and the locking element 102 are spaced apart. In this way, interference between the operating component 103 and the locking element 102 can be avoided when the telescopic tube 30 is directly pushed to shorten or lengthen its extension.

[0047] Optionally, such as Figure 4 As shown, a first elastic element 400 is provided on each side of the operating column 330. This provides a more balanced elastic force to the operating member 103. In this embodiment, the first elastic element 400 is a spring; however, in other embodiments, the first elastic element 400 can also be a silicone elastic column, etc., and there is no limitation thereto.

[0048] Furthermore, such as Figure 4 As shown, the second elastic element 500 is specifically connected to the side wall of the fixing element 111 and the second locking piece 212, respectively, so that the locking element 102 always has a tendency to rotate in the direction of locking with the locking part. Thus, when the locking element 102 disengages from either locking part and the extension length of the telescopic tube 30 is adjusted, the external force applied to the operating element 140 can be removed. The locking element 102 can automatically reset under the elastic force of the second elastic element 500 and re-engage with the other locking part. This also improves the stability of the engagement between the locking element 102 and the locking part, ensuring the relative fixation of the telescopic tube 30 and the base bracket 12. In this embodiment, the second elastic element 500 is a torsion spring, but it is not limited to this.

[0049] Furthermore, such as Figure 3 As shown, second locking pieces 212 are pivotally connected to the side walls of the fixing members 111 on both sides of the base bracket 12. This facilitates the adjustment of the extension length of the telescopic tubes 30 on both sides of the base bracket 12.

[0050] Furthermore, such as Figure 3 and Figure 4 As shown, the two ends of the linkage rod 600 are respectively fixed to the locking member 102 of one of the operating components 100. When the locking member 102 on one side of the base bracket 12 rotates, the locking member 102 on the other side of the base bracket 12 can be rotated simultaneously through the linkage action of the linkage rod 600, thereby realizing the simultaneous adjustment of the extension length of the telescopic tubes 30 on both sides of the base bracket 12. In this way, only the operating component 100 on one side of the base bracket 12 needs to be operated to realize the adjustment of the telescopic tubes 30 on both sides. The operation is simple, and the linkage adjustment function of the telescopic tubes 30 on both sides can be realized through a single linkage rod 600. The structure is simple, easy to implement, and has low manufacturing cost. In this embodiment, the two ends of the linkage rod 600 are respectively connected to the locking member 102 of one of the operating components 100. In some embodiments, the two ends of the linkage rod 600 can also be fixed to the locking member 102 of one of the operating components 100 by means of welding or riveting, for example. The base bracket 12 has corresponding mounting holes (not shown in the attached figure) on the fixing parts 111 on both sides. The two ends of the linkage rod 600 pass through these corresponding mounting holes and are fixed to the corresponding locking parts 102.

[0051] In summary, the base of the aforementioned child safety seat has the following technical advantages:

[0052] In the aforementioned base, the locking element 102 in the operating component 100 is connected to the base support 12. By operating the locking element 102, it can engage with any locking part on the telescopic tube 30, thereby fixing the base support 12 at a certain length position relative to the telescopic tube 30. When it is necessary to adjust the extension length of the telescopic tube 30, simply operate the locking element 102 to disengage from the locking part, allowing the telescopic tube 30 to slide relative to the base support 12. After the telescopic tube 30 slides relative to the base support 12 to the desired position, the locking element 102 can be operated to engage with another locking part on the telescopic tube 30, thereby adjusting the relative position of the base support 12 and the telescopic tube 30, i.e., adjusting the extension length of the telescopic tube 30.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A base for a child safety seat, characterized in that, include: The system includes a base support, an operating component, and a telescopic tube. The operating component includes a locking member connected to the base support. The telescopic tube has multiple locking parts along its length. The locking member can be operated to engage with the locking parts, locking the telescopic tube to the base support. The locking member can also be operated to disengage from the locking parts, allowing the telescopic tube to slide relative to the base support. The operating component also includes an operating member, which can be operated to drive the locking member to engage or disengage with the locking parts. The operating member has an operating ramp and a first position and a second position. When the operating member is in the first position, the operating ramp abuts against the locking member, and the operating member can be pressed to rotate the locking member. When the operating member is in the second position, the operating ramp and the locking member are spaced apart.

2. The base of the child safety seat according to claim 1, characterized in that, The locking member is pivotally connected to the base bracket. The locking member can be rotated to lock into the locking part, so that the telescopic tube and the base bracket are locked together. The locking member can also be rotated to disengage from the locking part, so that the telescopic tube and the base bracket slide relative to each other.

3. The base of the child safety seat according to claim 2, characterized in that, The locking member is provided with a male connection part, and the locking part is a female connection part that can lock and engage with the male connection part.

4. The base of the child safety seat according to claim 3, characterized in that, The locking member is provided with engaging teeth, and the locking part is an engaging hole that can cooperate with the engaging teeth.

5. The base of the child safety seat according to claim 4, characterized in that, The engaging teeth have a first side and a second side along the extension direction of the telescopic tube, and the first side is an engaging slope inclined toward the second side.

6. The base of the child safety seat according to claim 1, characterized in that, It also includes a first elastic element, the two ends of which abut against the operating element and the base bracket, respectively.

7. The base of the child safety seat according to claim 6, characterized in that, The operating component includes an operating body, an operating post protruding from one side of the operating body, and a limiting hook. The operating inclined surface is located at the end of the operating post away from the operating body. The base support has a receiving groove for accommodating the operating component. The groove wall of the receiving groove forms a limiting boss. When the operating component is installed in the receiving groove, the limiting hook can engage with the limiting boss to restrict the operating component from moving towards the opening of the receiving groove. The two ends of the first elastic member abut against the operating body and the bottom of the receiving groove, respectively. The bottom of the receiving groove has a through hole, through which the operating post can pass and abut against the locking member.

8. The base of the child safety seat according to claim 1, characterized in that, The locking element includes a first locking piece and a second locking piece that are connected to each other and arranged at a certain angle. The first locking piece is arranged along the extension direction of the telescopic tube. The second locking piece can be operated to lock the first locking piece with the locking part, and the second locking piece can be operated to disengage the first locking piece from the locking part.

9. The base of the child safety seat according to claim 1, characterized in that, It also includes a second elastic element, which is connected to the base bracket and the locking element respectively. The second elastic element constantly causes the locking element to move toward the locking part to cooperate with the locking part.

10. The base of the child safety seat according to claim 9, characterized in that, It also includes a fixing member fixed to one side of the base bracket, the second elastic member being connected to the fixing member and the locking member respectively, and the locking member being pivotally connected to the fixing member.

11. The base of the child safety seat according to claim 10, characterized in that, It also includes a guide cylinder fixed to one side of the base bracket, the guide cylinder being sleeved outside the telescopic tube, and the telescopic tube being able to slide relative to the guide cylinder.

12. The base of the child safety seat according to any one of claims 1 to 11, characterized in that, It also includes a linkage rod, and the operating components are respectively provided on both sides of the base bracket. The two ends of the linkage rod are respectively fixed to the locking member of one of the operating components.

13. The base of the child safety seat according to claim 12, characterized in that, The base support includes a first support frame, a second support frame, and a synchronizing element. The first support frame and the second support frame are spaced apart. The two ends of the synchronizing element are respectively fixed to the first support frame and the second support frame. Each of the operating components is respectively located on the side of the first support frame and the second support frame away from the synchronizing element.

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