Chair with adjustable backrest

Abstract

The utility model belongs to the technical field of seats, and particularly relates to a seat with an adjustable backrest. Comprising a seat cushion, a backrest, a supporting seat, a connecting rod assembly and a locking assembly, the supporting seat is provided with a mounting rod and a back cushion, the supporting seat is used for mounting the mounting rod and is provided with a first position where the back cushion is located on the rear side of the seat cushion and a second position where the back cushion is located on the front side of the seat cushion, and the connecting rod assembly is arranged between the mounting rod and the supporting seat and used for switching the mounting rod between the first position and the second position. And the locking component acts on the connecting rod component and is used for locking the mounting rod at the first position or the second position. Due to the fact that the supporting base, the connecting rod assembly and the locking assembly are arranged, the connecting rod assembly is provided with the first connecting rod and the second connecting rod which are rotationally connected with the supporting base and the backrest, the backrest can be adjusted in the front-back direction relative to the cushion in the rotating process of the first connecting rod and the second connecting rod, and a user can sit on the seat in the reverse direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of seats, and in particular relates to a seat with an adjustable backrest. Background Art

[0002] Existing car seats include a seat cushion and a backrest. The adjustment of the backrest only involves the angle adjustment between the seat cushion and the seat backrest. The seat backrest is mainly designed based on the standard of one-way riding. Such a design has some shortcomings in practice. For example, if the passengers in the front and back rows need to communicate, it will be more difficult. Especially in some commercial vehicles, long-distance buses, golf carts, shuttle buses and other models, the front and back passengers will have more communication needs. At this time, if the seat can be matched with an adjustable riding direction so that passengers can ride in the opposite direction, it will be more convenient. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a seat with an adjustable backrest, the backrest of which can be adjusted forward and backward to adapt to the forward and reverse sitting of the user.

[0004] The utility model adopts the following technical solutions:

[0005] The utility model proposes a chair with an adjustable backrest, which has the following characteristics: a seat cushion, a backrest, a mounting rod and a backrest, a support seat for mounting the mounting rod and having a first position for allowing the backrest to be located at the rear side of the seat cushion and a second position for allowing the backrest to be located at the front side of the seat cushion, a connecting rod assembly, which is arranged between the mounting rod and the support seat and is used for converting the mounting rod between the first position and the second position, and a locking assembly, which acts on the connecting rod assembly and is used for locking the mounting rod at the first position or the second position.

[0006] The seat with an adjustable backrest proposed in the utility model may also have such a feature, wherein the connecting rod assembly comprises: a first connecting rod, one end of which is rotatably connected to the support seat, and the other end of which is rotatably connected to the mounting rod; a second connecting rod, one end of which is rotatably connected to the first connecting rod, and the other end of which is rotatably connected to the mounting rod; a guide hole is provided on the first connecting rod or the mounting rod, and one end of the second connecting rod moves along the guide hole.

[0007] The seat with adjustable backrest proposed in the utility model may also have such a feature, wherein a accommodating groove for accommodating the first connecting rod is opened in the support seat, the accommodating groove has a first accommodating area and a second accommodating area, one end of the first connecting rod is rotatably arranged in the middle of the accommodating groove, when the first connecting rod located in the first accommodating area rotates 180° to reach the second accommodating area, the mounting rod is switched from the first position to the second position.

[0008] The seat with adjustable backrest proposed in the utility model may also have such a feature, wherein the connection position between the second connecting rod and the mounting rod is located above the connection position between the first connecting rod and the mounting rod, and when the mounting rod is in the first position or the second position, a triangular support mechanism is formed between the first connecting rod, the second connecting rod and the mounting rod.

[0009] The seat with an adjustable backrest proposed in the utility model may also have such a feature, wherein the support seat also has a pair of positioning members symmetrically arranged at the first position and the second position, and the positioning members are provided with positioning grooves for positioning the mounting rod, one side of the positioning groove is formed with a supporting surface for the mounting rod to abut, and the other side is formed with a blocking surface for blocking the mounting rod.

[0010] The seat with an adjustable backrest proposed in the utility model may also have such a feature, wherein the locking assembly comprises: a latch pin, which is movably arranged on a support seat, a lock pin, which is arranged on the latch pin and moves with the latch pin, and a socket and a lock hole for inserting the latch pin and the lock pin respectively.

[0011] The seat with an adjustable backrest proposed in the utility model may also have such a feature that the locking assembly also has an elastic member acting on the latch to assist the locking pin in inserting into the lock hole; the latch has a hand-holding portion and a penetration portion, the hand-holding portion is exposed on one side of the support seat, one end of the penetration portion is connected to the hand-holding portion, and the other end passes through the support seat and the insertion hole to be exposed on the other side of the support seat, and the elastic member is sleeved on the portion of the penetration portion exposed on the support seat.

[0012] The seat with adjustable backrest proposed in the utility model may also have such a feature that the locking pin includes: a pair of locking parts, both of which can cooperate with the lock hole, a connecting part, connecting the pair of locking parts and fixed to the latch, and the pair of locking parts are symmetrically arranged on both sides of the latch.

[0013] The seat with an adjustable backrest proposed in the utility model may also have the following feature: a guide surface inclined outward from top to bottom is provided at one end of the locking portion facing the locking hole; after the first connecting rod contacts the guide surface, the locking portion moves and is inserted into the locking hole under the action of the elastic member to achieve locking.

[0014] The seat with an adjustable backrest proposed in the utility model may also have the following features: two groups of mounting rods, support seats and connecting rod assemblies are provided, and are arranged one-to-one on both sides of the seat cushion; the back cushion is arranged between the two groups of mounting rods, and the back cushion has two back cushion surfaces located on the front and back sides.

[0015] Function and effect of utility model

[0016] According to the utility model, the seat with an adjustable backrest is provided with a support seat, a connecting rod assembly and a locking assembly. The connecting rod assembly has a first connecting rod and a second connecting rod which are rotatably connected to the support seat and the backrest, so that the backrest can be converted from a first position to a second position during the rotation of the first connecting rod and the second connecting rod, that is, it can be adjusted in the front and rear directions relative to the seat cushion, and the backrest is fixed to the support seat by the locking assembly, so that the seat cushion can be in two fixed positions on the front or rear side of the seat cushion, so that the user can sit on the seat in reverse, and adjust it in a rotating manner, which is convenient and quick to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a seat according to Embodiment 1 of the present utility model.

[0018] Figure 2 It is a state diagram of the seat in embodiment 1 of the present utility model.

[0019] Figure 3 This is one of the structural schematic diagrams of the adjustable backrest mechanism of Example 1 of the utility model.

[0020] Figure 4 This is the second structural schematic diagram of the adjustable backrest mechanism of Example 1 of the utility model.

[0021] Figure 5 It is a structural schematic diagram of the connecting rod assembly of Example 1 of the utility model.

[0022] Figure 6 It is a structural schematic diagram of the positioning member of Example 1 of the utility model.

[0023] Figure 7 yes Figure 4 A partial enlarged view of point M in the middle.

[0024] Figure 8 It is a structural cross-sectional view of the locking assembly of Example 1 of the utility model installed on the support seat.

[0025] Fig. 9 It is a schematic diagram of the structure of embodiment 2 of the present invention.

[0026] Fig.10 It is a schematic structural diagram of a connecting rod assembly according to embodiment 3 of the present invention.

[0027] Figure numerals: seat 100, adjustable backrest mechanism 10, backrest 11, mounting rod 12, cushion 13, seat cushion 20, support seat 30, left support seat 30b, right support seat 30a, accommodating groove 31, positioning member 32, positioning groove 321, abutment surface 322, embedding groove 323, connecting rod assembly 40, first connecting rod 41, bushing 411, first rotating member 412, guide hole 413, locking hole 414, second connecting rod 42, hinge shaft 421, second rotating member 422, locking assembly 50, latch 51, hand-held portion 511, penetration portion 512, locking pin 52, locking portions 521a, 521b, connecting portion 522, guide surface 523, spring 53. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, purpose and effect of the utility model easy to understand, the following is a detailed description of the utility model with an adjustable backrest seat in combination with the embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] The terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions.

[0030] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] <Example 1>

[0032] Figure 1 It is a structural diagram of a seat according to Embodiment 1 of the present utility model.

[0033] Figure 2 It is a state diagram of the seat in embodiment 1 of the present utility model.

[0034] This embodiment provides a seat 100 that can be used in golf carts, shuttles, business cars, long-distance buses, etc., so that passengers can sit in reverse. The seat 100 includes a fixed bracket (not shown in the figure), a seat cushion 20 and an adjustable backrest mechanism 10. The seat cushion 20 and the adjustable backrest mechanism 10 are mounted on the fixed bracket and installed in the vehicle compartment through the fixed bracket. The adjustable backrest mechanism 10 includes a backrest 11, such as Figure 2 As shown, the backrest 11 can move from the original position A to the position B and finally to the position C, so that the passenger can sit in the reverse direction.

[0035] Figure 3 and Figure 4 It is a schematic diagram of the structure of the adjustable backrest mechanism of Example 1 of the utility model at different angles.

[0036] like Figure 1-4 As shown, the adjustable backrest mechanism 10 also includes a support seat 30, a connecting rod assembly 40 and a locking assembly 50, wherein a pair of support seats 30 are provided, namely a left support seat 30b and a right support seat 30a, which are symmetrically arranged on the left and right sides of the seat cushion 20 for mounting the backrest 11, and the backrest 11 has a pair of mounting rods 12 and a cushion 13 installed between the pair of mounting rods 12, and the pair of mounting rods 12 are respectively arranged corresponding to the left support seat 30b and the right support seat 30a, and the cushion 13 has two cushion surfaces located on the front and back sides and symmetrically arranged, so that people can still lean on the backrest 11 after the position is adjusted. Each support seat 30 has a first position and a second position for the mounting rod 12 to be retained. When the mounting rod 12 is in the first position, the cushion 13 is located at the rear side of the seat cushion 20, allowing passengers to sit forward (the front and back here are based on the direction of the vehicle's travel), and when the mounting rod 12 is in the second position, the cushion 13 is located at the front side of the seat cushion 20, allowing passengers to sit in the reverse direction.

[0037] The connecting rod assembly 40 is arranged between the mounting rod 12 and the support seat 30, and is provided with two groups, each group of connecting rod assemblies corresponds to a mounting rod 12 and a support seat 30, and is used to adjustably mount the backrest 11 on the support seat 30 so that it can be adjusted forward and backward relative to the seat cushion 20, that is, the mounting rod 12 is switched between the first position and the second position. The locking assembly 50 is used to keep the backrest 11 fixed relative to the support seat 30, that is, to lock the mounting rod 12 in the first position or the second position. Among them, the connecting rod assembly 40 has a first connecting rod 41 and a second connecting rod 42, one end of the first connecting rod 41 is rotatably connected to the support seat 30, and the other end is rotatably connected to the mounting rod 12, one end of the second connecting rod 42 is rotatably connected to the first connecting rod 12, and the other end is rotatably connected to the mounting rod 12, and the locking assembly 50 acts on the connecting rod assembly 40, and is used to lock the mounting rod 12 in the first position or the second position, specifically, the locking assembly 50 can fix the first connecting rod 41 or the second connecting rod 42 on the support seat 30.

[0038] Figure 5 It is a structural schematic diagram of the connecting rod assembly of Example 1 of the utility model.

[0039] like Figure 4 As shown, the left support seat 30b and the right support seat 30a have the same structure. Taking the right support seat 30a as an example, a receiving groove 31 for accommodating the first connecting rod 44 is opened in the support seat 30, and the receiving groove 31 has a first receiving area and a second receiving area. One end of the first connecting rod 41 is rotatably set in the middle of the receiving groove 31 through a shaft sleeve 411, and the other end is connected to the mounting rod 12 through a first rotating member 412. When the first connecting rod 41 located in the first receiving area rotates 180° about the axis of the shaft sleeve 411 to reach the second receiving area, the mounting rod 12 can be switched from the first position to the second position; conversely, when the first connecting rod 41 located in the second receiving area rotates 180° about the axis of the shaft sleeve 411 to reach the first receiving area, the mounting rod 12 can be switched from the second position to the first position. One end of the second link 42 is rotatably connected to the middle of the first link 41 through a hinge shaft 421, and the other end is connected to the mounting rod 12 through a second rotating member 422. A guide hole 413 is provided on the first link 41, and the hinge shaft 421 is inserted into the guide hole 413. During the rotation of the first link 41, the end of the second link 42 where the hinge shaft 421 is located moves along the guide hole 413, and the end of the hinge shaft 421 is fixed and limited by a screw 423 to prevent the hinge shaft 421 from slipping out of the guide hole 413 during the movement. Figure 5 As shown, the connection position between the second rotating member 422 and the mounting rod 12 is located above the connection position between the first rotating member 412 and the mounting rod 12, so that when the mounting rod 12 is in the first position or the second position, a triangular support structure can be formed between the first connecting rod 41, the second connecting rod 42 and the mounting rod 12, which can, on the one hand, drive the second connecting rod 42 and the mounting rod 12 to rotate when the first connecting rod 41 rotates, and on the other hand, can form a relatively stable support structure after the rotation is completed. The connection position between the first rotating member 412 and the mounting rod 12 and the connection position between the shaft sleeve 411 and the support seat 30 are basically on a straight line parallel to the length direction of the first connecting rod, so that after the rotation is completed, the first connecting rod 41 can be in a straight line and located in the receiving groove 31.

[0040] Figure 6 It is a structural schematic diagram of the positioning member of Example 1 of the utility model.

[0041] like Figure 3 and Figure 4 As shown, each support seat 30 also has a pair of positioning members 32 symmetrically arranged at the front and rear ends of the accommodating groove 31, and the pair of positioning members 32 are also exactly at the first position and the second position. Figure 6As shown, Figure 6 (1) is a front view of the positioning member 32. Figure 6 (2) is a schematic diagram of the reverse side of the positioning member 32. Each positioning member 32 is provided with a positioning groove 321 for positioning the mounting rod 12. A supporting surface 322 for the mounting rod 12 to support is formed on one side of the positioning groove 321, and a blocking surface 324 is formed on the other side. An obtuse angle ∠1 is formed between the supporting surface 322 and the bottom of the positioning groove 321. The obtuse angle ∠1 allows the backrest and the seat cushion to form an obtuse angle when they are in the leaning position, which is convenient for passengers to lean on. The blocking surface 324 is located on the opposite side of the supporting surface 322, and forms an obtuse angle ∠2 with the bottom of the positioning groove 321, wherein ∠2>∠1. The height of the blocking surface 324 is only slightly higher than the bottom of the positioning groove 321. On the one hand, it can ensure that the backrest can rotate normally, and on the other hand, it can ensure the stability of the backrest. When the backrest is subjected to force from the rear side, it will tend to tilt forward. After the force is applied, the front bottom side of the mounting rod 12 can directly press against the blocking surface 324. The blocking surface 324 blocks the bottom of the mounting rod 12, preventing the mounting rod 12 from tilting forward due to the force applied from the rear side of the backrest, thereby ensuring the stability of the backrest.

[0042] The positioning member 32 can be made of rubber or plastic with a certain hardness and elasticity, and is mainly used to form a positioning and support barrier for the mounting rod 12. When the mounting rod 12 is transferred to the positioning groove 321 driven by the connecting rod assembly, it can be fixed relative to the seat cushion 20. The bottom and rear side of the positioning member 32 are provided with an embedding groove 323, and correspondingly, the receiving groove 31 is provided with an embedding strip at a corresponding position. When the positioning member 32 is installed on the receiving groove 31, the embedding strip is embedded in the mounting groove 323 to strengthen the fixation between the two.

[0043] Figure 7 This is a schematic diagram of the structure of the locking assembly of Embodiment 1 of the utility model installed on the support seat (i.e. Figure 4 (partial enlarged view of M in the figure).

[0044] Figure 8 It is a structural cross-sectional view of the locking assembly of Example 1 of the utility model installed on the support seat.

[0045] like Figure 7 As shown, the locking assembly 50 has a locking member and an elastic member. The locking member includes a latch 51 and a lock pin 52. The latch 51 is movably arranged on the support seat 30. The lock pin 52 is arranged on the latch 51 and moves with the latch 51. The shaft sleeve 411 of the first connecting rod 41 is provided with a plug hole for the latch 51 to be inserted and passed through. The rod body of the first connecting rod 41 is provided with a lock hole 414 (see Figure 5), the elastic member acts on the latch pin 51 to assist the locking pin 52 in inserting into the locking hole 414. In this embodiment, the locking assembly 50 is provided with a group of support seats mounted on one side, such as Figure 7 and Figure 8 As shown, the latch 51 has a hand-held portion 511 and a penetration portion 512. The hand-held portion 511 is exposed on one side of the support seat 30. One end of the penetration portion 512 is connected to the hand-held portion 511, and the other end passes through the support seat 30 and the insertion hole in the shaft sleeve 411 and is exposed on the other side of the support seat 30. The elastic member is a spring 53. The spring 53 is sleeved on the portion of the penetration portion 512 exposed on the support seat 30. A convex portion is formed at the end of the penetration portion 512. One end of the spring 53 is against the convex portion, and the other end is against the outer surface of the support seat 30. The hand-held portion 511 and the penetration portion 512 can be separated or integrated. When separated, the two are connected together by threads, see Figure 8 The lock pin 52 has a pair of locking parts (locking parts 521a and 521b respectively) for cooperating with the lock hole 414 and a connecting part 522 connecting the pair of locking parts. The connecting part 522 is in the shape of a rod and is arranged parallel to the length direction of the support seat 30. The middle part of the connecting part 522 is for the plug 51 to pass through and is fixed with the plug 51. A locking part is arranged at each end. The two locking parts are symmetrically distributed at the two ends of the connecting part 522 with the axis of the sleeve 411 as the axis, and a guide surface 523 inclined outward from top to bottom is arranged at one end of the locking part facing the lock hole 414 (i.e., the end that can be inserted into the lock hole 414). When the first connecting rod 41 contacts the guide surface 523, the locking part moves and is inserted into the lock hole 414 under the action of the spring 53 to achieve locking. The setting of the guide surface 523 allows the locking part to be automatically locked without the need to manually pull out the locking part and then insert it into the lock hole 414, which is more convenient. In this embodiment, since the locking assembly 50 is only arranged on the support seat 30 on one side, the support seat 30 on the other side and the first connecting rod 41 are only rotationally connected. By setting a rotating shaft in the sleeve 411 of the first connecting rod 41, and fixing both ends of the rotating shaft on the support seat 30, the first connecting rod 41 can rotate relative to the support seat 30 with the rotating shaft as the axis, driven by the first connecting rod 41 in the support seat on the other side.

[0046] The backrest adjustment process of this embodiment is as follows:

[0047] Assume that Figure 4 and Figure 7The position shown is the initial position. First, the user holds the hand-held portion 511 of the latch 51 and pulls the latch 51 outward. The connecting portion 522 moves outward with the latch 51 and moves the locking portion 521a outward at the same time. When the locking portion 521a moves out of the lock hole 414, the backrest can be picked up for adjustment. At this time, the first connecting rod 41 can rotate around the axis of the sleeve 411. Next, the first connecting rod 41 is picked up and rotated. At this time, the user can release the hand-held part 511, and the pin 51 will be reset under the action of the spring 53, that is, return to its original position. When the user rotates the first connecting rod 41 to nearly 180 degrees, the bottom of the first connecting rod 41 touches the locking part 521b that has returned to its original position. Under the action of the spring 53 and the guide surface 523, the locking part 521b can automatically move a certain distance in the direction away from the first connecting rod 41, so that the first connecting rod 41 can continue to rotate. Until the first connecting rod 41 is rotated to 180 degrees, and then under the action of the spring 53, the locking part 521b returns to its original position and is inserted into the lock hole 414 to achieve the adjusted locking. At this time, the back cushion is on the other side of the seat cushion, and the adjustment is completed.

[0048] <Example 2>

[0049] Fig. 9 It is a schematic diagram of the structure of embodiment 2 of the present invention.

[0050] This embodiment is basically the same as the above-mentioned embodiment 1, except that: Fig. 9 As shown, the locking assembly 50 of this embodiment is provided with two groups, corresponding to the two support seats 30 respectively, that is, one group of locking assembly 50 is provided on each support seat 30a and support seat 30b, and the installation method and principle of the locking assembly 50 are the same as those of the above-mentioned embodiment 1. When adjusting the backrest, the latches 51 on both sides need to be pulled out to realize the rotation of the first connecting rod 41.

[0051] <Example 3>

[0052] Fig.10 It is a schematic structural diagram of a connecting rod assembly according to embodiment 3 of the present invention.

[0053] This embodiment is basically the same as the above-mentioned embodiment 1 and embodiment 2, except that: Fig.10 As shown, in this embodiment, a vertical guide hole 121 is opened on the mounting rod 12, and the end of the second connecting rod 42 close to the first connecting rod 41 is directly set on the first connecting rod 41 by screws and rotating shafts, and the end close to the mounting rod 12 is rotated and moved in the guide hole 121 by screws and rotating shafts.

[0054] <Example 4>

[0055] In this embodiment, on the basis of the above-mentioned embodiments 1-3, a sliding assembly is provided between the seat cushion 20 and the adjustable backrest mechanism 10. Specifically, sliding blocks are provided at the bottom of the seat cushion 20 on both sides close to the support seat 30, and sliding rails are provided on the inner side of the two support seats 30 (i.e., the side facing the seat cushion 20). The sliding blocks are slidably arranged on the sliding rails, so that the lateral distance of the seat cushion 20 relative to the backrest can be adjusted according to actual needs to adapt to the needs of different passengers.

[0056] The above embodiments are only used to illustrate the specific implementation of the present invention, and the present invention is not limited to the description scope of the above embodiments. It is understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also considered to be within the protection scope of the present application.

Claims

1. A seat with an adjustable backrest, characterized in that: include: cushion, Backrest, with mounting rod and cushions, a support seat for mounting the mounting rod and having a first position for positioning the back cushion at the rear side of the seat cushion and a second position for positioning the back cushion at the front side of the seat cushion, a connecting rod assembly, disposed between the mounting rod and the support seat, for switching the mounting rod between the first position and the second position, A locking assembly acts on the connecting rod assembly and is used to lock the mounting rod in the first position or the second position.

2. The seat with adjustable backrest according to claim 1, characterized in that: The connecting rod assembly comprises: A first connecting rod, one end of which is rotatably connected to the support seat, and the other end of which is rotatably connected to the mounting rod; a second connecting rod, one end of which is rotatably connected to the first connecting rod, and the other end of which is rotatably connected to the mounting rod; A guide hole is provided on the first connecting rod or the mounting rod, and one end of the second connecting rod moves along the guide hole.

3. The seat with an adjustable backrest according to claim 2, characterized in that: A accommodating groove for accommodating the first connecting rod is provided in the support seat, and the accommodating groove has a first accommodating area and a second accommodating area. One end of the first connecting rod is rotatably arranged in the middle of the accommodating groove. When the first connecting rod located in the first accommodating area rotates 180° to reach the second accommodating area, the mounting rod is switched from the first position to the second position.

4. The seat with an adjustable backrest according to claim 3, characterized in that: in, The connection position between the second connecting rod and the mounting rod is located above the connection position between the first connecting rod and the mounting rod. When the mounting rod is in the first position or the second position, a triangular support mechanism is formed among the first connecting rod, the second connecting rod and the mounting rod.

5. The seat with an adjustable backrest according to claim 1, characterized in that: in, The support seat also has a pair of positioning members symmetrically arranged at the first position and the second position, and the positioning members are each provided with a positioning groove for positioning the mounting rod. One side of the positioning groove is formed with a supporting surface for the mounting rod to abut, and the other side is formed with a blocking surface for blocking the mounting rod.

6. The seat with adjustable backrest according to any one of claims 2 to 4, characterized in that: in, The locking assembly comprises: A latch is movably arranged on the support seat, A lock pin is arranged on the latch pin and moves with the latch pin. The first connecting rod is provided with an inserting hole and a locking hole for the latch pin and the locking pin to be inserted respectively.

7. The seat with an adjustable backrest according to claim 6, characterized in that: The locking assembly also has an elastic member, which acts on the latch pin to assist the latch pin in inserting into the lock hole; The latch has a hand-held portion and a penetration portion, the hand-held portion is exposed on one side of the support seat, one end of the penetration portion is connected to the hand-held portion, and the other end passes through the support seat and the socket and is exposed on the other side of the support seat, and the elastic member is sleeved on the portion of the penetration portion exposed on the support seat.

8. The seat with an adjustable backrest according to claim 7, characterized in that: The locking pin comprises: A pair of locking parts can both cooperate with the locking hole, a connecting portion, connecting the pair of locking portions and being fixed with the latch, The pair of locking parts are symmetrically arranged on both sides of the latch.

9. The seat with an adjustable backrest according to claim 8, characterized in that: A guide surface inclined outward from top to bottom is provided at one end of the locking portion facing the locking hole. After the first connecting rod contacts the guide surface, the locking portion moves and is inserted into the locking hole under the action of the elastic member to achieve locking.

10. The seat with adjustable backrest according to any one of claims 1 to 5, characterized in that: The mounting rods, the support seats and the connecting rod assemblies are each provided in two groups and are arranged one by one on both sides of the seat cushion. The back cushion is arranged between the two groups of the mounting rods and comprises two back cushion surfaces located on the front and back sides.

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