Backrest of seat and seat

Abstract

The utility model discloses a backrest of a seat and the seat, the backrest of the seat comprises: a backrest main body, which is provided with a first insertion part and a first through hole; the waist support is arranged on one side of the backrest main body in the first direction, a second inserting part and a second through hole are formed in the waist support, one of the first inserting part and the second inserting part is an inserting groove, the other one of the first inserting part and the second inserting part is an inserting claw, the inserting groove is matched with the inserting claw in an inserting mode, and the first through hole and the second through hole correspond to each other and are fixedly connected through a first fastener. Therefore, one of a first inserting part on the backrest main body and a second inserting part on the waist support is an inserting groove, the other one is an inserting claw, the inserting groove is matched with the inserting claw in an inserting manner, and a first through hole in the backrest main body and a second through hole in the waist support correspond to each other and are fixedly connected through a first fastener; therefore, the space utilization rate can be increased, the number of parts can be reduced, cost is reduced, the structure is simple, operation is easy, and installation is rapid and convenient.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a seat back and seat. Background Technology

[0002] With the development of technology and the improvement of users' living standards, people have higher and higher requirements for seat comfort. Some seat structures are equipped with lumbar support on the backrest. Lumbar support can provide better lumbar support, reduce the pressure on the back muscles when sitting for a long time, and thus improve the user's comfort.

[0003] In related technologies, the lumbar support structure of some seat backrests is complex and has many parts, which makes the installation process cumbersome, time-consuming, and space-consuming. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a seat backrest with a simple structure and convenient operation, which not only improves space utilization but also reduces the number of parts and lowers costs.

[0005] This utility model further proposes a seat.

[0006] The seat backrest according to this utility model includes: a backrest body, on which a first insertion part and a first through hole are provided; a lumbar support, which is provided on one side of the backrest body in a first direction, and on which a second insertion part and a second through hole are provided, wherein one of the first insertion part and the second insertion part is an insertion groove and the other is an insertion claw, the insertion groove and the insertion claw are inserted and engaged, and the first through hole and the second through hole correspond to each other and are connected and fixed by a first fastener.

[0007] Therefore, by making one of the first insertion part on the backrest body and the second insertion part on the lumbar support a insertion groove and the other a insertion claw, the insertion groove and the insertion claw are inserted and matched, and the first through hole on the backrest body and the second through hole on the lumbar support correspond to each other and are connected and fixed by the first fastener, not only can the space utilization rate be improved, but also the number of parts can be reduced, the cost can be reduced, and the structure is simple, easy to operate, and quick and convenient to install.

[0008] In some examples of this utility model, the backrest body is provided with a insertion groove, the lumbar support is provided with an insertion claw, and the backrest body is also provided with a clearance groove. The clearance groove is connected to the insertion groove so that the insertion claw first enters the clearance groove and then moves to the insertion groove to engage with the insertion groove.

[0009] In some examples of this utility model, the clearance groove and the insertion groove are connected relative to each other in a second direction, and the clearance groove is opened in a first direction toward the side of the waist support to allow the insertion claw to enter, wherein the first direction and the second direction are perpendicular to each other.

[0010] In some examples of this utility model, the plug-in claw includes a first claw segment and a second claw segment. One end of the first claw segment is connected to the lumbar support and extends in a first direction. The second claw segment is connected to the other end of the first claw segment and extends in a second direction. The second claw segment enters the plug-in groove and engages with the plug-in groove. The first claw segment abuts against the backrest body in the second direction.

[0011] In some examples of this utility model, there are multiple first plug-in portions, which are spaced apart, and there are multiple second plug-in portions, which are arranged in a one-to-one correspondence with each other.

[0012] In some examples of this utility model, the plurality of first plug-in portions include a first central plug-in portion and a first side plug-in portion. The first central plug-in portion is located in the middle of the backrest body in a third direction. There are multiple first side plug-in portions, which are spaced apart on both sides of the first central plug-in portion and at least partially offset from the first central plug-in portion in a second direction. The plurality of second plug-in portions include a second central plug-in portion and a second side plug-in portion. The second central plug-in portion is located in the middle of the backrest body in a third direction. There are multiple second side plug-in portions, which are spaced apart on both sides of the second central plug-in portion and at least partially offset from the second central plug-in portion in a second direction.

[0013] In some examples of this utility model, the second insertion portion and the second through hole are spaced apart in the second direction, and the first through hole and the second through hole correspond to each other in the second direction.

[0014] In some examples of this utility model, there are multiple first perforations, which are spaced apart, and there are multiple second perforations, which correspond one-to-one with the multiple first perforations.

[0015] In some examples of this utility model, the plug claw is provided with a third through hole, the lumbar support is provided with a fourth through hole, the third through hole and the fourth through hole correspond to each other in a first direction and are connected by a second fastener; the backrest of the seat also includes a connecting block, the second through hole is provided on the connecting block, the connecting block is also provided with a fifth through hole, the lumbar support is provided with a sixth through hole, the fifth through hole and the sixth through hole correspond to each other in a first direction and are connected by a third fastener.

[0016] The seat according to an embodiment of the present utility model includes: the backrest of the seat described above.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the backrest of a seat according to an embodiment of the present utility model;

[0020] Figure 2 This is an exploded view of the backrest of a seat according to an embodiment of the present utility model;

[0021] Figure 3 This is an exploded view of the backrest of a seat according to an embodiment of the present utility model;

[0022] Figure 4 This is a partial schematic diagram of the backrest of a seat according to an embodiment of the present utility model;

[0023] Figure 5 This is a partial schematic diagram of the backrest of a seat according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. The backrest of the seat;

[0026] 10. Backrest main body; 101. First insertion part; 102. First through hole; 103. Clearance groove;

[0027] 1011. First middle insertion part; 1012. First side insertion part;

[0028] 1021, First central perforation; 1022, First side perforation;

[0029] 20. Waist support; 201. Second insertion part; 202. Fourth through hole; 203. Sixth through hole;

[0030] 2011, First claw segment; 2012, Second claw segment; 2013, Second middle insertion part; 2014, Second side insertion part; 2015, Third through hole;

[0031] 30. Connecting block; 301. Second perforation; 302. Fifth perforation. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0033] The following is for reference. Figures 1-5 The present invention describes a seat back 100 according to an embodiment of the present invention, which can be applied to a seat.

[0034] Combination Figures 1-5 As shown, the backrest 100 of the chair according to this utility model mainly includes: a backrest body 10 and a lumbar support 20. The backrest body 10 is provided with a first insertion part 101 and a first through hole 102. The first insertion part 101 and the first through hole 102 facilitate the positioning and installation of components on the backrest body 10, and facilitate subsequent maintenance and replacement.

[0035] Furthermore, the lumbar support 20 is disposed on one side of the backrest body 10 in the first direction. The lumbar support 20 is provided with a second insertion part 201 and a second through hole 301. One of the first insertion part 101 and the second insertion part 201 is an insertion groove, and the other is an insertion claw. The insertion groove and the insertion claw are inserted and matched. This not only makes the connection between the lumbar support 20 and the backrest body 10 simple and direct, but also facilitates the quick positioning of the lumbar support 20 on the backrest body 10, facilitates the installation and disassembly of the lumbar support 20 and the backrest body 10, and facilitates the subsequent maintenance and replacement of the lumbar support 20. In addition, the structure of the insertion groove and the insertion claw has high structural strength and is not easy to break. It can effectively prevent the lumbar support 20 from detaching from the backrest body 10 due to the failure of the connection between the lumbar support 20 and the backrest body 10. It can also help reduce the space occupied by the connection structure between the lumbar support 20 and the backrest body 10, and improve the space utilization rate.

[0036] Furthermore, the first through hole 102 and the second through hole 301 correspond to each other and are connected and fixed by the first fastener. Specifically, the space of the insertion slot is larger than the volume of the insertion claw. By setting corresponding first through holes 102 and second through holes 301, and having the first fastener pass through the second through hole 301 and the first through hole 102 in sequence, this not only further strengthens the connection between the lumbar support 20 and the backrest body 10, but also effectively prevents the insertion claw from moving in the insertion slot, ensuring the stability and effectiveness of the insertion structure. This prevents the lumbar support 20 from shaking or loosening relative to the backrest body 10, improves the comfort of the lumbar support 20 structure, and enhances the user experience.

[0037] Furthermore, during installation, the lumbar support 20 structure requires first completing the insertion and engagement of the plug claw and the plug slot, and then using the first fastener to pass through the second through hole 301 and the first through hole 102 to fasten the lumbar support 20 structure, thereby completing the installation of the lumbar support 20 structure on the backrest body 10.

[0038] Therefore, by making one of the first insertion part 101 on the backrest body 10 and the second insertion part 201 on the lumbar support 20 a insertion groove and the other a insertion claw, the insertion groove and the insertion claw are inserted and engaged. Furthermore, the first through hole 102 on the backrest body 10 and the second through hole 301 on the lumbar support 20 correspond to each other and are connected and fixed by a first fastener. This not only improves space utilization but also reduces the number of parts, lowers costs, and provides a simple and easy-to-operate structure for quick and convenient installation. In addition, the combination of the insertion structure and the through hole structure helps improve the versatility and compatibility of the lumbar support 20 installation structure, facilitating the improvement and replacement of the lumbar support 20 structure.

[0039] In some embodiments of this utility model, the first through hole 102 and the second through hole 301 can be threaded holes, and the first fastener can be a screw.

[0040] Combination Figure 1 , Figure 2 and Figure 3 As shown, the backrest body 10 is provided with a insertion groove, the lumbar support 20 is provided with an insertion claw, and the backrest body 10 is also provided with a clearance groove 103. The clearance groove 103 is connected to the insertion groove, so that the insertion claw first enters the clearance groove 103 and then moves into the insertion groove to engage with it. Specifically, the insertion claw uses a hook claw structure, and the structure of the insertion groove and the insertion claw corresponds. By providing the clearance groove 103, the insertion claw first enters the clearance groove 103 and then moves into the insertion groove. This allows the insertion claw to be smoothly placed into the insertion groove, thereby achieving a tight engagement between the insertion claw and the insertion groove. This ensures the rationality and reliability of the insertion connection structure between the lumbar support 20 and the backrest body 10, and avoids situations where the insertion claw has difficulty entering the insertion groove.

[0041] Combination Figure 1 , Figure 2 and Figure 3 As shown, the clearance groove 103 and the insertion groove are connected relative to each other in the second direction. The clearance groove 103 is open on the side facing the waist support 20 in the first direction to allow the insertion claw to enter. The first direction and the second direction are perpendicular to each other.

[0042] Specifically, if only a plug slot with the same size as the plug claw structure is provided, the plug claw will have difficulty entering the plug slot. By making the clearance groove 103 and the plug slot relatively connected in the second direction, the free space around the plug slot can be expanded to ensure the smooth entry of the plug claw, so as to ensure that the plug claw can be properly plugged into the plug slot, and at the same time, the effectiveness of the clearance groove 103 can be guaranteed.

[0043] Furthermore, the plug-in claw is disposed on the waist support 20. By making the relief groove 103 open to the side of the waist support 20 in the first direction, the opening direction of the relief groove 103 can be aligned with the mounting side of the waist support 20, allowing the plug-in claw to enter the relief groove 103. This facilitates the plug-in claw entering the plug-in slot connected to the relief groove 103, thereby achieving the plug-in engagement between the plug-in claw and the plug-in slot.

[0044] Combination Figure 1 , Figure 2 and Figure 3 As shown, the insertion claw includes a first claw segment 2011 and a second claw segment 2012. One end of the first claw segment 2011 is connected to the lumbar support 20 and extends in a first direction. The second claw segment 2012 is connected to the other end of the first claw segment 2011 and extends in a second direction. The second claw segment 2012 enters the insertion groove and engages with the insertion groove. The first claw segment 2011 abuts against the backrest body 10 in the second direction.

[0045] Specifically, the first claw segment 2011 extends in the first direction, and the second claw segment 2012 extends in the second direction, so that the connecting claw has a bent portion to ensure that the connecting claw can provide a certain gripping force.

[0046] Furthermore, the second claw segment 2012 enters the insertion slot and fits tightly with it. The first claw segment 2011 abuts against the backrest body 10 in the second direction, and the first claw segment 2011 is connected to the second claw segment 2012. This not only ensures a stable and effective insertion between the insertion claw and the insertion slot, but also enables the connection and fastening between the lumbar support 20 and the backrest body 10 through the insertion of the insertion claw and the insertion slot. This prevents the lumbar support 20 from shaking or shifting, and improves the stability and reliability of the lumbar support 20 installation.

[0047] In some embodiments of this utility model, the first claw segment 2011 and the second claw segment 2012 are integrally formed to form a plug-in claw. This not only improves the structural strength of the plug-in claw and reduces the risk of breakage, but also simplifies the manufacturing process of the plug-in claw and prevents protruding parts on the plug-in claw from affecting the plug-in fit between the plug-in claw and the plug-in groove or causing the plug-in claw to not be fully inserted into the plug-in groove.

[0048] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, there are multiple first plug-in portions 101, which are spaced apart, and multiple second plug-in portions 201, which are arranged in a one-to-one correspondence with each other. Specifically, by arranging multiple first plug-in portions 101 and multiple second plug-in portions 201 at intervals and ensuring that each first plug-in portion 101 corresponds to each other, stress concentration at the connection between the lumbar support 20 and the backrest body 10 can be prevented, thus preventing the lumbar support 20 from breaking or twisting. Furthermore, the stability and reliability of the connection between the lumbar support 20 and the backrest body 10 can be improved. Even if one of the first plug-in portions 101 or the second plug-in portion 201 fails, the other corresponding first plug-in portions 101 and second plug-in portions 201 can still maintain their connection, extending the service life of the lumbar support 20.

[0049] Combination Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a plurality of first plug-in portions 101 include a first central plug-in portion 1011 and a first side plug-in portion 1012. The first central plug-in portion 1011 is located in the middle of the backrest body 10 in a third direction. There are multiple first side plug-in portions 1012, which are spaced apart on both sides of the first central plug-in portion 1011 and are at least partially offset from the first central plug-in portion 1011 in a second direction. A plurality of second plug-in portions 201 include a second central plug-in portion 2013 and a second side plug-in portion 2014. The second central plug-in portion 2013 is located in the middle of the backrest body 10 in a third direction. There are multiple second side plug-in portions 2014, which are spaced apart on both sides of the second central plug-in portion 2013 and are at least partially offset from the second central plug-in portion 2013 in a second direction.

[0050] Specifically, by providing a first central insertion portion 1011 and a first side insertion portion 1012, and having a plurality of first side insertion portions 1012 spaced apart on both sides of the first central insertion portion 1011 and at least partially offset from the first central insertion portion 1011 in the second direction, and simultaneously providing a second central insertion portion 2013 and a second side insertion portion 2014, and having a plurality of second side insertion portions 2014 spaced apart on both sides of the second central insertion portion 2013 and at least partially offset from the second central insertion portion 2013 in the second direction, the first central insertion portion 1011... The insertion part 1011 and the second insertion part 2013 correspond to each other in structure and position. The multiple first side insertion parts 1012 and the multiple second side insertion parts 2014 are arranged one-to-one in structure and position. This helps to make the lumbar support 20 present a symmetrical structure, which can provide better support for the lumbar support 20, make the force on the lumbar support 20 more even, improve the structural strength of the lumbar support 20, prevent the lumbar support 20 from breaking or twisting due to force, and improve the stability and reliability of the connection between the lumbar support 20 and the backrest body 10.

[0051] Combination Figure 1 , Figure 2 and Figure 3 As shown, the second insertion part 201 and the second through hole 301 are spaced apart in the second direction, and the first through hole 102 and the second through hole 301 correspond to each other in the second direction. Specifically, the lumbar support 20 is installed on one side of the backrest body 10 in the first direction. By making the second insertion part 201 and the second through hole 301 spaced apart in the second direction, and the first through hole 102 and the second through hole 301 correspond to each other in the second direction, this not only changes the conventional installation direction of the first fastener, but also reduces the space occupied by the connection structure between the lumbar support 20 and the backrest body 10 in the first direction, thereby improving space utilization and allowing more space for the assembly design of the seat back, but also ensures the rationality and reliability of the connection structure between the lumbar support 20 and the backrest body 10, and prevents adverse effects between the second insertion part 201 and the second through hole 301.

[0052] Combination Figure 1 , Figure 2 and Figure 3As shown, there are multiple first perforations 102, spaced apart, and multiple second perforations 301, each corresponding to one of the first perforations 102. Specifically, by setting multiple first perforations 102 and multiple second perforations 301, and ensuring a one-to-one correspondence between the second perforations 301 and the first perforations 102, the stability and reliability of the connection between the lumbar support 20 and the backrest body 10 can be improved. Even if one of the first perforations 102 or second perforations 301 breaks or fails, the corresponding fit between the other first perforations 102 and second perforations 301 can still maintain a tight fit, thus extending the service life of the lumbar support 20. Furthermore, the spaced-apart arrangement of the multiple first perforations 102 and multiple second perforations 301 prevents breakage caused by excessively close proximity between adjacent perforations.

[0053] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the connector claw has a third through hole 2015, and the waist support 20 has a fourth through hole 202. The third through hole 2015 and the fourth through hole 202 correspond to each other in the first direction and are connected by a second fastener. Specifically, by providing a third through hole 2015 on the connector claw and a fourth through hole 202 on the waist support 20, and by sequentially passing the second fastener through the third through hole 2015 and the fourth through hole 202 in the first direction, the connector claw and the waist support 20 are connected. This not only makes the connection between the connector claw and the waist support 20 simple, direct, stable, and reliable, but also facilitates the installation and disassembly of the connector claw and the waist support 20, and facilitates the subsequent maintenance and replacement of the connector claw and the waist support 20.

[0054] The seat backrest 100 also includes a connecting block 30. A second through hole 301 is disposed on the connecting block 30, and a fifth through hole 302 is also disposed on the connecting block 30. A sixth through hole 203 is disposed on the lumbar support 20. The fifth through hole 302 and the sixth through hole 203 correspond to each other in the first direction and are connected by a third fastener. Specifically, the connecting block 30 is disposed on the lumbar support 20. By disposing of the second through hole 301 on the connecting block 30, the connection and fastening between the lumbar support 20 and the main body of the backrest 10 can be facilitated, and the structure is simple and easy to operate. Furthermore, by providing a fifth through hole 302 on the connecting block 30 and a sixth through hole 203 on the waist support 20, and by sequentially passing the third fastener through the fifth through hole 302 and the sixth through hole 203 in the first direction, the connecting block 30 and the waist support 20 are connected. This not only makes the connection between the connecting block 30 and the waist support 20 simple, direct, stable and reliable, but also facilitates the installation and disassembly of the connecting block 30 and the waist support 20, and facilitates the subsequent maintenance and replacement of the connecting block 30 and the waist support 20.

[0055] In some embodiments of this utility model, the third through hole 2015, the fourth through hole 202, the fifth through hole 302 and the sixth through hole 203 can be threaded holes, and the first fastener and the second fastener can be screws.

[0056] The seat according to this utility model mainly includes: the seat back 100 as described above. Specifically, since the structure of the seat back 100 is simpler and easier to operate, and has good working performance, applying the seat back 100 to the seat can not only improve the space utilization of the seat back structure, but also reduce the number of parts and reduce the manufacturing cost of the seat back. Moreover, the simple structure and easy operation can realize the quick installation of the lumbar support 20 structure.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A seat back, characterized in that, include: Backrest body (10), the backrest body (10) is provided with a first plug-in part (101) and a first through hole (102). The lumbar support (20) is located on one side of the backrest body (10) in the first direction. The lumbar support (20) is provided with a second insertion part (201) and a second through hole (301). One of the first insertion part (101) and the second insertion part (201) is an insertion groove and the other is an insertion claw. The insertion groove and the insertion claw are inserted and engaged. The first through hole (102) and the second through hole (301) correspond to each other and are connected and fixed by a first fastener.

2. The backrest of the seat according to claim 1, characterized in that, The backrest body (10) is provided with a plug groove, the lumbar support (20) is provided with a plug claw, and the backrest body (10) is also provided with a clearance groove (103). The clearance groove (103) is connected to the plug groove so that the plug claw first enters the clearance groove (103) and then moves to the plug groove to plug and engage with the plug groove.

3. The backrest of the seat according to claim 2, characterized in that, The clearance groove (103) is connected to the insertion groove in a second direction. The clearance groove (103) is open in a first direction toward the side of the waist support (20) to allow the insertion claw to enter. The first direction and the second direction are perpendicular to each other.

4. The backrest of the seat according to claim 2, characterized in that, The insertion claw includes a first claw segment (2011) and a second claw segment (2012). One end of the first claw segment (2011) is connected to the lumbar support (20) and extends in a first direction. The second claw segment (2012) is connected to the other end of the first claw segment (2011) and extends in a second direction. The second claw segment (2012) enters the insertion groove and engages with the insertion groove. The first claw segment (2011) and the backrest body (10) abut against each other in the second direction.

5. The backrest of the seat according to claim 1, characterized in that, There are multiple first plug-in portions (101), which are spaced apart. There are multiple second plug-in portions (201), which are arranged in a one-to-one correspondence with each other.

6. The backrest of the seat according to claim 5, characterized in that, The plurality of first plug-in portions (101) include a first central plug-in portion (1011) and a first side plug-in portion (1012). The first central plug-in portion (1011) is located in the middle of the backrest body (10) in a third direction. There are a plurality of first side plug-in portions (1012). The plurality of first side plug-in portions (1012) are spaced apart on both sides of the first central plug-in portion (1011) and are at least partially offset from the first central plug-in portion (1011) in a second direction. The plurality of second plug-in portions (201) include a second central plug-in portion (2013) and a second side plug-in portion (2014). The second central plug-in portion (2013) is located in the middle of the backrest body (10) in a third direction. There are a plurality of second side plug-in portions (2014). The plurality of second side plug-in portions (2014) are spaced apart on both sides of the second central plug-in portion (2013) and are at least partially offset from the second central plug-in portion (2013) in a second direction.

7. The backrest of the seat according to claim 1, characterized in that, The second insertion part (201) and the second through hole (301) are spaced apart in the second direction, and the first through hole (102) and the second through hole (301) are opposite to each other in the second direction.

8. The backrest of the seat according to claim 1, characterized in that, There are multiple first perforations (102), which are spaced apart. There are multiple second perforations (301), which correspond one-to-one with the multiple first perforations (102).

9. The backrest of the seat according to claim 2, characterized in that, The plug claw is provided with a third through hole (2015), and the waist support (20) is provided with a fourth through hole (202). The third through hole (2015) and the fourth through hole (202) correspond to each other in the first direction and are connected by a second fastener. It also includes a connecting block (30), the second through hole (301) is disposed on the connecting block (30), the connecting block (30) is also provided with a fifth through hole (302), the waist support (20) is provided with a sixth through hole (203), the fifth through hole (302) and the sixth through hole (203) correspond to each other in the first direction and are connected by a third fastener.

10. A type of seat, characterized in that, The backrest of the seat included in any one of claims 1-9.

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