Simple chair back adjusting mechanism

Abstract

The simple chair back adjusting mechanism comprises a back support and a chair seat, the back support comprises a backrest supporting part horizontally arranged in the left-right direction, the backrest supporting part is configured to be connected with a backrest, the left end and the right end of the backrest supporting part extend downwards to form transition parts, and the two transition parts are located on the left side and the right side of the chair seat correspondingly; the bottom end of the transition part extends in the front-back direction to form a sliding part, and the sliding part is of a sleeve-shaped structure. Two sliding supporting rods which are symmetrical left and right are hung at the bottom end of the chair seat, and the sliding parts on the left side and the right side are connected to the two sliding supporting rods in a sleeving mode respectively; a connecting hole is hollowed in the side wall of the sliding part, and a plurality of clamping grooves are formed in the side wall of the sliding supporting rod in the length direction; the simple chair back adjusting mechanism further comprises an adjusting piece, the adjusting piece comprises a telescopic locking part, and the locking part penetrates through the connecting hole and is in clamping fit with the corresponding clamping groove in a telescopic mode. The adjusting piece comprises a connecting part and a clamping pin inserted into the connecting part, and the connecting part is provided with an external thread and is in threaded connection with the connecting hole.

Description

Technical Field

[0001] The utility model generally relates to the technical field of seats, and in particular to a simple chair back adjustment mechanism. Background Art

[0002] Chairs are essential pieces of furniture for people to sit on. To meet users' deeper needs, existing chairs often incorporate a variety of functions. For example, in children's chairs, to accommodate children's rapid growth, the backrests of existing children's chairs are typically adjustable, sliding forward and backward relative to the seat. This allows children to adjust the seat depth to their individual body shape, ensuring optimal support.

[0003] For example, an existing patent provides a children's learning chair (application number: CN202321850553.7), in which the backrest is installed on a bracket, and the bracket is connected to the connecting seat on the column through two adjustment rods, and the adjustment rod includes a first connecting rod and a second connecting rod that slide together. When the backrest moves forward and backward, the first connecting rod slides relative to the second connecting rod, thereby adjusting the seat depth of the seat, and the first connecting rod and the second connecting rod are fixed by a lock hole, and the locking and unlocking between the first connecting rod and the second connecting rod can be adjusted by depressing the lock hole.

[0004] However, the above solution has the following problems: the bracket, connecting seat and adjusting rod are all split structures, so the backrest needs to be installed on the bracket first, then the bracket is installed on the adjusting rod, and finally connected and fixed to the connecting seat. This not only makes the assembly operation of the seat more cumbersome, but also the bracket, connecting seat and adjusting rod need to be manufactured separately during manufacturing, thereby increasing the processing and manufacturing cost of the seat. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a simple chair back adjustment mechanism, in which the back bracket is connected to the chair seat by being sleeved on the sliding support rod through a sleeve-shaped sliding portion, without the need to add extra parts, and the assembly operation is relatively simple and convenient; moreover, the back bracket is an integrally molded structure made of a metal tube, which has a simple structure and low processing and manufacturing costs.

[0006] The effect of the utility model is achieved in this way:

[0007] The present application provides a simple chair back adjustment mechanism, comprising a back support and a seat, the back support being an integrally formed structure made of a metal tube, the back support comprising a backrest support portion horizontally arranged in a left-right direction, the backrest support portion being configured to connect the backrest, the left and right ends of the backrest support portion both extending downward to form a transition portion, the two transition portions being respectively located on the left and right sides of the seat, the bottom ends of the transition portions extending in a front-to-back direction to form a sliding portion, the sliding portion being a sleeve-shaped structure; two left-right symmetrical sliding support rods are hung at the bottom end of the seat, the axial direction of the sliding support rods being consistent with the front-to-back direction of the seat, the sliding portions on the left and right sides being respectively sleeved on the two sliding support rods, and the sliding portions can slide forward and backward along the sliding support rods, thereby driving the backrest to slide forward and backward relative to the seat to adjust the seat depth, and the sliding portions stay at the current position after sliding stops;

[0008] The side wall of the sliding portion is hollowed out with a connection hole, and the side wall of the sliding support rod is provided with a plurality of slots along the length direction. The simple chair back adjustment mechanism also includes an adjustment member, which includes a retractable locking portion that passes through the connection hole and retractably engages with the corresponding slot. When the locking portion is extended and inserted into the slot, the sliding portion and the sliding support rod are relatively fixed. When the locking portion is retracted and released from the slot, the sliding portion can slide back and forth along the sliding support rod again.

[0009] The adjusting piece comprises a sleeve-shaped connecting portion and a bayonet inserted into the connecting portion. The connecting portion has an external thread and is screwed to the connecting hole.

[0010] Furthermore, a locking portion is formed on the side of the bayonet close to the sliding support rod, and a hand wheel is provided on the side of the bayonet away from the sliding support rod, and the hand wheel is configured to drive the bayonet to move, so that the locking and adjustment operation of the sliding portion is relatively simple.

[0011] Furthermore, a spring is provided between the locking portion and the hand wheel. The locking portion automatically snaps into the slot under the restoring force of the spring, eliminating the need for the user to manually push the hand wheel, further enhancing the convenience of the sliding portion locking and adjusting operation.

[0012] Furthermore, the sliding support rod is mounted on the bottom of the seat via an angle iron. The angle iron includes a vertical portion extending in the vertical direction and a horizontal portion extending in the horizontal direction. The front and rear ends of the sliding support rod are connected to the vertical portion of the angle iron, while the horizontal portion is detachably connected to the bottom of the seat via screws. The angle iron has a simple structure and low cost, and the screw connection to the seat facilitates installation and removal.

[0013] Furthermore, threaded holes are provided at both ends of the sliding support rod, and a connecting hole is hollowed out on the vertical portion, through which the vertical portion is screwed to the sliding support rod. This not only ensures a more reliable connection between the sliding support rod and the angle iron, but also makes installation and removal of the sliding support rod more convenient.

[0014] Furthermore, the sidewall of the sliding support rod extends axially to form a block-shaped positioning protrusion, and the vertical portion has a corresponding positioning hole. When the positioning protrusion is engaged with the positioning hole, the connecting hole aligns with the threaded hole at the end of the sliding support rod. To install the sliding support rod, simply align the positioning protrusion with the positioning hole to complete the positioning operation, and then screw in the screw through the connecting hole to complete the installation of the sliding support rod, which is relatively simple.

[0015] Furthermore, a plurality of legs are provided at the bottom of the seat, which are welded and fixed to one side of the vertical portion, so that the legs can be installed and removed from the bottom of the seat together with the angle iron, making the overall structure of the seat simpler and the assembly operation easier.

[0016] Furthermore, the transition section is a curved structure, comprising an armrest portion and a connecting portion that are inclined toward each other. The upper end of the armrest portion intersects the backrest support portion, the lower end of the armrest portion intersects the upper end of the connecting portion, and the lower end of the connecting portion intersects the sliding portion. From front to back, the armrest portion is tilted upward and rearward, while the connecting portion is tilted downward and rearward, and the armrest portion is configured to support the user's arms. This allows the backrest to function as both an armrest and a backrest, improving practicality. Furthermore, the connecting portion is tilted downward and rearward, placing the center of gravity of the backrest closer to the sliding portion, thereby improving stability.

[0017] Furthermore, the backrest is connected to the backrest support portion via an elastic member, which has elastic deformation capability. This not only allows the backrest to automatically conform to the user's back through the deformation of the elastic member, providing stable support, but also allows the backrest to provide a more elastic support experience for the user's back, thereby enhancing comfort.

[0018] The simple chair back adjustment mechanism provided by the present application has a back bracket slidably connected to the sliding support rod through a sliding portion on the lower side, which not only allows the backrest to slide back and forth relative to the seat to adjust the seat depth, but also when assembling the seat, it is only necessary to connect the sleeve-shaped sliding portion to the sliding support rod to connect the back bracket to the seat, without the need to add extra parts, and the assembly operation is relatively simple and convenient; in addition, the back bracket is an integrally molded structure made of metal tube, which has a simple structure and low processing and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the side structure of a seat provided in an embodiment of the present application when the seat depth is maximum;

[0022] Figure 3 This is a schematic diagram of the side structure of the seat provided in an embodiment of the present application when the seat depth is minimum;

[0023] Figure 4 A schematic diagram of the connection structure between the back support and the seat provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the changing process of locking and unlocking the adjusting member provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the connection structure between the sliding support rod and the seat provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the internal structure of the adjusting member provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the connection structure between the adjusting member and the sliding portion provided in an embodiment of the present application;

[0028] Figure 9 A schematic diagram of the connection structure between the pad and the armrest provided in an embodiment of the present application;

[0029] Figure 10 A schematic diagram of the connection structure between the backrest and the back support provided in an embodiment of the present application;

[0030] Figure 11 A schematic diagram of the three-dimensional structure of a seat when the backrest provided in an embodiment of the present application is a double-back structure.

[0031] The reference numerals are: 1-back support, 110-back support portion, 111-mounting gasket, 120-transition portion, 121-armrest portion, 122-connection portion, 123-pad, 124-plug portion, 125-plug hole, 130-sliding portion, 131-connection hole, 132-anti-slip cover, 2-seat, 210-sliding support rod, 211-slot, 212-positioning protrusion, 220-angle iron, 221-vertical part, 222-horizontal part, 223-through hole, 224-positioning hole, 230-chair leg, 231-chair leg connecting part, 3-backrest, 310-elastic part, 311-mounting part, 312-cover plate, 313-mounting slot, 4-adjusting part, 410-locking part, 420-connecting part, 421-pin, 422-spring, 430-handwheel. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0033] Please refer to the attached Figure 1-11 The embodiment of the present application provides a simple chair back adjustment mechanism, including a back bracket 1 and a seat 2, the back bracket 1 is an integrally formed structure made of a metal tube, the back bracket 1 includes a backrest support portion 110 horizontally arranged in the left and right directions, the backrest support portion 110 is configured to connect the backrest 3, the left and right ends of the backrest support portion 110 extend downward to form a transition portion 120, the two transition portions 120 are respectively located on the left and right sides of the seat 2, and the bottom end of the transition portion 120 extends in the front and back directions to form a sliding portion 130, which is a sleeve-shaped structure; two left and right symmetrical sliding support rods 210 are hung at the bottom end of the seat 2, the axial direction of the sliding support rod 210 is consistent with the front and back direction of the seat 2, the sliding portions 130 on the left and right sides are respectively sleeved on the two sliding support rods 210, and the sliding portion 130 can slide back and forth along the sliding support rods 210, thereby driving the backrest 3 to slide back and forth relative to the seat 2 to adjust the seat depth, and the sliding portion 130 stays at the current position after sliding stops;

[0034] A connecting hole 131 is hollowed out on the side wall of the sliding portion 130, and a plurality of slots 211 are formed on the side wall of the sliding support rod 210 along its length. The simplified seat back adjustment mechanism also includes an adjustment member 4, which includes a retractable locking portion 410. The locking portion 410 passes through the connecting hole 131 and retractably engages with the corresponding slot 211. When the locking portion 410 is extended and inserted into the slot 211, the sliding portion 130 and the sliding support rod 210 are relatively fixed. When the locking portion 410 is retracted and released from the slot 211, the sliding portion 130 can slide back and forth along the sliding support rod 210 again.

[0035] The adjusting member 4 includes a sleeve-shaped connecting portion 420 and a latch 421 inserted into the connecting portion 420 . The connecting portion 420 has an external thread and is screwed to the connecting hole 131 .

[0036] In this embodiment, the back support 1 is slidably connected to the sliding support rod 210 via the lower sliding portion 130. This not only allows the backrest 3 to slide forward and backward relative to the seat 2 to adjust the seat depth, but also allows the back support 1 to be connected to the seat 2 by simply fitting the sleeve-shaped sliding portion 130 onto the sliding support rod 210 during assembly. This eliminates the need for redundant parts, making assembly simple and convenient. Furthermore, the back support 1 is a one-piece structure made of metal tubing, offering a simple structure and low manufacturing costs. Furthermore, the sliding portion 130 and the sliding support rod 210 are secured together by a locking portion 410 and a retaining groove 211, providing a strong connection. The sliding portion 130 can be adjusted again by simply pulling the adjusting member 4 to disengage the locking portion 410 from the retaining groove 211, making operation simple. Furthermore, the connecting portion 420 is screwed into the connecting hole 131, preventing the adjusting member 4 from falling off the sliding portion 130 and facilitating installation and removal.

[0037] Preferably, each side of the sliding support rod 210 is provided with 11 slots 211, that is, the seat depth has 11 levels for adjustment, which is highly practical. Of course, in other embodiments of the present application, the number of slots 211 on the sliding support rod 210 can also be 10, 12, 13, etc.

[0038] Please refer to the attached Figure 8 The front and rear ends of the sliding portion 130 are sleeved with anti-slip sleeves 132, which increase the friction between the sliding portion 130 and the sliding support rod 210, thereby making the sliding adjustment process of the sliding portion 130 more stable and smooth.

[0039] Please refer to the attached Figure 5-7 In some embodiments of the present application, a locking portion 410 is formed on the side of the latch 421 close to the sliding support rod 210, and a handwheel 430 is provided on the side of the latch 421 away from the sliding support rod 210, and the handwheel 430 is configured to drive the latch 421 to move.

[0040] In this embodiment, when the user needs to adjust the seat depth, he only needs to pull the hand wheel 430 outward, drive the pin 421 to slide outward and disengage the locking part 410 from the slot 211, so that the sliding part 130 can be slid and adjusted relative to the sliding support rod 210. Conversely, pushing the hand wheel 430 inward can re-lock the sliding part 130, making the locking and adjustment operation of the sliding part 130 relatively simple.

[0041] Please refer to the attached Figure 7 In some embodiments of the present application, a spring 422 is provided between the locking portion 410 and the hand wheel 430 .

[0042] In this embodiment, when the user pulls the handwheel 430 outward, the locking portion 410 disengages from the slot 211, and the spring 422 deforms and generates a reset elastic force, so that when the adjustment is completed, the user only needs to release the handwheel 430, and the locking portion 410 will automatically snap into the slot 211 under the reset elastic force of the spring 422, without the user having to manually push the handwheel 430, further improving the convenience of the locking adjustment operation of the sliding portion 130.

[0043] Please refer to the attached Figure 6 In some embodiments of the present application, the sliding support rod 210 is mounted on the bottom end of the seat 2 via an angle iron 220. The angle iron 220 includes a vertical portion 221 extending vertically and a horizontal portion 222 extending horizontally. The front and rear ends of the sliding support rod 210 are connected to the vertical portion 221 of the angle iron 220, and the horizontal portion 222 is detachably connected to the bottom end of the seat 2 via screws. The angle iron 220 has a simple structure and low cost, and is fixed to the seat 2 via screws, making it easy to install and remove.

[0044] Please refer to the attached Figure 6 In some embodiments of the present application, threaded holes are formed at the front and rear ends of the sliding support rod 210, and a through hole 223 is hollowed out on the vertical portion 221. The vertical portion 221 is screwed to the sliding support rod 210 through the through hole 223. This not only ensures a more reliable connection between the sliding support rod 210 and the angle iron 220, but also facilitates installation and removal of the sliding support rod 210.

[0045] Please refer to the attached Figure 6 In some embodiments of the present application, the sidewall of the sliding support rod 210 extends axially to form a block-shaped positioning protrusion 212, and the vertical portion 221 has a corresponding positioning hole 224. When the positioning protrusion 212 is engaged with the positioning hole 224, the through hole 223 is aligned with the threaded hole at the end of the sliding support rod 210. When installing the sliding support rod 210, the positioning operation is completed by simply aligning the positioning protrusion 212 with the positioning hole 224 and engaging it. Then, screwing in the screw through the through hole 223 completes the installation of the sliding support rod 210, which is relatively simple.

[0046] Among them, preferably, the lower side opening of the positioning hole 224 is set, so that when the sliding support rod 210 is installed, the positioning protrusion 212 can be aligned with the opening position of the positioning hole 224 and inserted, further improving the simplicity of the positioning operation of the sliding support rod 210.

[0047] Please refer to the attached Figure 4-6In some embodiments of the present application, a plurality of legs 230 are further provided at the bottom of the seat 2, and the legs 230 are welded and fixed to one side of the vertical portion 221. This allows the legs 230 to be installed and removed from the bottom of the seat 2 along with the angle irons 220, making the overall structure of the seat simpler and the assembly operation easier.

[0048] Among them, preferably, the top ends of the two chair legs 230 adjacent to each other in the left and right directions are connected by a horizontally arranged chair leg connector 231, and the left and right sides of the chair leg connector 231 are respectively welded to the vertical parts 221 of the two adjacent angle irons 220 on the left and right, so that the two chair legs 230 can be installed and disassembled together, which not only increases the strength, but also further improves the convenience of the installation and disassembly operations of the chair legs 230.

[0049] Please refer to the attached Figure 9 In some embodiments of the present application, the transition portion 120 is a bent structure, including an armrest portion 121 and a connecting portion 122 that are inclined to each other, the upper end of the armrest portion 121 intersects with the backrest support portion 110, the lower end of the armrest portion 121 intersects with the upper end of the connecting portion 122, and the lower end of the connecting portion 122 intersects with the sliding portion 130; from front to back, the armrest portion 121 is inclined toward the upper rear, and the connecting portion 122 is inclined toward the lower rear, and the armrest portion 121 is configured to support the user's arm.

[0050] In this embodiment, the transition portion 120 is bent and an armrest portion 121 bent toward the rear and upward is formed to provide support for the user's arms, so that the back support 1 can also function as an armrest, which is more practical; and the connecting portion 122 is tilted toward the rear and downward, so that the position of the backrest 3 can be close to the sliding portion 130 in the horizontal direction, so that the center of gravity of the backrest 3 can fall at a position close to the sliding portion 130, thereby improving stability.

[0051] Please refer to the attached Figure 9 A pad 123 can be detachably installed on the armrest portion 121, and the pad 123 can provide a more comfortable support experience for the user's arm. In addition, a plurality of plug-in portions 124 are provided at the bottom of the pad 123, and a plurality of plug-in holes 125 are correspondingly hollowed out on the armrest portion 121. The plug-in portions 124 are fixed to the armrest portion 121 through the plug-in holes 125, which has good connection strength and makes the installation and disassembly operations of the pad 123 easier.

[0052] Please refer to the attached Figure 10 In some embodiments of the present application, the backrest 3 is connected to the backrest support portion 110 via an elastic member 310. The elastic member 310 has elastic deformation capability. This allows the backrest 3 to automatically conform to the user's back and provide stable support through the deformation of the elastic member 310. Furthermore, the backrest 3 provides a more elastic support experience for the user's back, resulting in a higher level of comfort.

[0053] Preferably, one end of the elastic member 310 is fixed to the backrest 3, and the other end is connected to the backrest support portion 110 via a mounting member 311. A semi-annular mounting gasket 111 is provided on the backrest support portion 110, and the rear side of the mounting member 311 is screwed to the mounting gasket 111, thereby being fixed to the backrest support portion 110. The rear side of the mounting member 311 is also covered with a cover plate 312 to cover the connection traces between the mounting member 311 and the mounting gasket 111, thereby improving the overall appearance and aesthetics. A mounting groove 313 is provided on the front side of the mounting member 311, and the rear end of the elastic member 310 is fixed to the mounting groove 313 by snap-fitting. The upper side of the mounting groove 313 is opened, so that the elastic member 310 can be inserted into or removed from the mounting groove 313 through the opening, thereby making the installation and removal of the elastic member 310 relatively simple.

[0054] Among them, preferably, the rear side of the backrest 3 is connected to the backrest support part 110 through two elastic members 310, which not only increases the connection strength between the backrest 3 and the backrest support part 110, but also improves the elastic support effect of the backrest 3, making it more comfortable.

[0055] Please refer to the attached Figure 11 The backrest 3 can be not only a single-back structure but also a double-back structure: the two backrests 3 on the left and right sides are respectively connected to the backrest support part 110 through elastic members 310, so that the two backrests 3 can be deformed independently, thereby better fitting the user's back and providing a softer and more comfortable support experience.

[0056] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than three.

[0057] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A simple chair back adjustment mechanism, characterized in that: The invention comprises a back support (1) and a seat (2), wherein the back support (1) is an integrally formed structure made of a metal tube, the back support (1) comprises a backrest support portion (110) arranged horizontally in a left-right direction, the backrest support portion (110) is configured to connect to a backrest (3), the left and right ends of the backrest support portion (110) both extend downward to form transition portions (120), the two transition portions (120) are respectively located on the left and right sides of the seat (2), the bottom end of the transition portion (120) extends in a front-back direction to form a sliding portion (130), the sliding portion (130) 30) is a sleeve-shaped structure; two left-right symmetrical sliding support rods (210) are hung at the bottom end of the seat (2), and the axial direction of the sliding support rod (210) is consistent with the front-back direction of the seat (2), and the sliding parts (130) on the left and right sides are respectively sleeved on the two sliding support rods (210), and the sliding parts (130) can slide forward and backward along the sliding support rods (210), thereby driving the backrest (3) to slide forward and backward relative to the seat (2) to adjust the seat depth, and the sliding part (130) stays at the current position after stopping sliding; A connecting hole (131) is hollowed out on the side wall of the sliding portion (130), and a plurality of slots (211) are opened on the side wall of the sliding support rod (210) along the length direction; the simple chair back adjustment mechanism also includes an adjustment member (4), and the adjustment member (4) includes a retractable locking portion (410), and the locking portion (410) passes through the connecting hole (131) and is retractably engaged with the corresponding slot (211); when the locking portion (410) is extended and inserted into the slot (211), the sliding portion (130) and the sliding support rod (210) are relatively fixed, and when the locking portion (410) is retracted and disengaged from the slot (211), the sliding portion (130) can slide back and forth along the sliding support rod (210) again; The adjusting member (4) comprises a sleeve-shaped connecting portion (420) and a bayonet (421) inserted into the connecting portion (420); the connecting portion (420) has an external thread and is screwed to the connecting hole (131).

2. The simplified chair back adjustment mechanism according to claim 1, characterized in that: The locking portion (410) is formed on a side of the bayonet (421) close to the sliding support rod (210), and a hand wheel (430) is provided on a side of the bayonet (421) away from the sliding support rod (210). The hand wheel (430) is configured to drive the bayonet (421) to move.

3. The simplified chair back adjustment mechanism according to claim 2, characterized in that: A spring (422) is provided between the locking portion (410) and the hand wheel (430).

4. The simplified chair back adjustment mechanism according to claim 1, characterized in that: The sliding support rod (210) is hung on the bottom end of the seat (2) through an angle iron (220), and the angle iron (220) includes a vertical portion (221) extending in the vertical direction and a horizontal portion (222) extending in the horizontal direction. The front and rear ends of the sliding support rod (210) are connected to the vertical portion (221) of the angle iron (220), and the horizontal portion (222) is detachably connected to the bottom end of the seat (2) by screw connection.

5. The simplified chair back adjustment mechanism according to claim 4, characterized in that: Threaded holes are provided at the front and rear ends of the sliding support rod (210), a through hole (223) is hollowed out on the vertical portion (221), and the vertical portion (221) is screwed to the sliding support rod (210) via the through hole (223).

6. The simplified chair back adjustment mechanism according to claim 5, characterized in that: The side wall of the sliding support rod (210) extends axially to form a block-shaped positioning protrusion (212), and a positioning hole (224) is correspondingly opened on the vertical portion (221). When the positioning protrusion (212) is inserted into the positioning hole (224), the through hole (223) faces the threaded hole at the end of the sliding support rod (210).

7. The simplified chair back adjustment mechanism according to claim 4, characterized in that: A plurality of chair legs (230) are also provided at the bottom of the chair seat (2), and the chair legs (230) are welded and fixed to one side of the vertical portion (221).

8. The simplified chair back adjustment mechanism according to claim 1, characterized in that: The transition portion (120) is a bent structure, comprising an armrest portion (121) and a connecting portion (122) that are inclined toward each other, wherein the upper end of the armrest portion (121) intersects with the backrest support portion (110), the lower end of the armrest portion (121) intersects with the upper end of the connecting portion (122), and the lower end of the connecting portion (122) intersects with the sliding portion (130); from front to back, the armrest portion (121) is inclined toward the upper rear, and the connecting portion (122) is inclined toward the lower rear, and the armrest portion (121) is configured to support the user's arm.

9. The simplified chair back adjustment mechanism according to claim 1, characterized in that: The backrest (3) is connected to the backrest support portion (110) via an elastic member (310), and the elastic member (310) has elastic deformation capability.

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