An airbag-type lumbar support structure and its office chair

Abstract

This utility model relates to an airbag-type lumbar support structure and its office chair. The lumbar support includes a lumbar back shell and an inner lumbar support panel disposed in front of the lumbar back shell. A mesh fabric is provided on the lumbar back shell and adheres to the outer surface of the inner lumbar support panel. An inflation assembly is provided on the lumbar back shell, comprising: an air pump disposed in an assembly slot and connected to a pair of airbags A via two air guide pipes A; a control unit box disposed at the lower part of the lumbar back shell and electrically connected to the air pump, suitable for controlling the air pump to inflate and deflate the pair of airbags A; a control panel disposed on the outer wall of the lumbar back shell, suitable for inputting control commands to the control unit box; and a pair of airbags A configured to extend and push the inner lumbar support panel forward to support the waist and tighten the mesh fabric when inflated; and to allow the inner lumbar support panel to return to its initial position under the tension of the mesh fabric when deflated. In this solution, the user can easily operate the lumbar support by simply pressing a button, which is very convenient and improves user comfort.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to an airbag-type lumbar support structure and its office chair. Background Technology

[0002] Most existing seats are equipped with lumbar supports to support the user's lower back. To adapt to different groups of people or different usage conditions, some lumbar supports can be adjusted along the seat depth to accommodate people of different body types. The lumbar support provides a high level of comfort when it is moved forward. For example, a Chinese invention with publication number CN223195771U discloses a seat that improves lumbar comfort, including a back support assembly, a lumbar support, and a sliding member. The back support assembly has a forward-extending support arm, and the sliding member is slidably disposed in the sliding groove of the support arm. The lumbar support is rotatably connected to the sliding member, and a reset member is provided between the two. Therefore, the lumbar support can move back and forth relative to the back support assembly along with the sliding member, and can also rotate independently relative to the sliding member and the back support assembly. An adjustable support assembly is provided between the sliding member and the support arm. The adjustable support assembly maintains the back and forth position of the lumbar support, while the lumbar support adaptively rotates on the sliding member to fit the lower back.

[0003] The above solution has the following technical problems:

[0004] ① The lumbar support component moves back and forth through the cooperation of the sliding component and the sliding groove. Adjustment is required by manual adjustment, which is quite troublesome. Furthermore, the stop groove in the sliding groove is prone to jamming, which can cause adjustment failure and requires frequent maintenance.

[0005] ② The lumbar support and the back support are supported by a sliding part and a support arm. However, the sliding part can slide relative to the support arm, which makes the support point weak and results in poor support stability for the lumbar support. This can easily lead to support failure and cause the lumbar support to suddenly sink inward, affecting the user experience. In addition, in order to facilitate the setting of the sliding part, the lumbar support is supported by a frame with a mesh fabric, which can easily cause poor resistance for the user and affect the user experience. Summary of the Invention

[0006] To address the aforementioned problems, the first objective of this utility model is to provide an airbag-type lumbar support structure. This structure features a movable inner lumbar support plate to support the lower back, providing excellent support. The forward and backward movement of the inner lumbar support plate is driven by electrically adjusted airbag inflation and deflation, making operation convenient. The airbags are also designed to prevent malfunction and ensure good stability. Furthermore, the lumbar support also has a massage function, further enhancing user comfort. The second objective of this utility model is to provide an office chair incorporating the aforementioned airbag-type lumbar support structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An airbag-type lumbar support structure includes a back frame and a lumbar support hinged to the back frame; characterized in that: the lumbar support includes a lumbar support back shell and a lumbar support inner plate disposed in front of the lumbar support back shell, the inner surface of the lumbar support back shell is recessed to form an assembly groove, and a mesh fabric is provided on the lumbar support back shell and attached to the outer surface of the lumbar support inner plate; the lumbar support back shell is provided with an inflation assembly, the inflation assembly including:

[0009] An air pump is installed in the assembly slot and is connected to a pair of airbags A via two air guide tubes A.

[0010] The control unit is located at the lower part of the backrest shell and is electrically connected to the air pump, which is suitable for controlling the air pump to inflate and deflate a pair of airbags A.

[0011] The control panel is located on the outer wall of the backrest shell. The control panel has multiple control buttons, which are suitable for inputting control commands to the control host box.

[0012] A pair of airbags A are respectively installed in the guide tubes on both sides between the backrest shell and the inner panel of the lumbar support. The airbags A are configured to extend and push the inner panel of the lumbar support forward to press against the waist and tighten the mesh when inflated; and to contract and release the inner panel of the lumbar support when deflated, so that the inner panel of the lumbar support can return to the initial position under the tension of the mesh.

[0013] In the above technical solution, the lumbar support includes a back shell and an inner panel. An inflation assembly is installed inside the back shell, which includes a control unit, an air pump, a control panel, and a pair of airbags A. The pair of airbags A are placed in the left and right guide tubes between the inner panel and the outer shell. When the user presses the corresponding "+" button on the outer panel, the air pump works to inflate the pair of airbags A, pushing the inner panel forward to support the waist. Otherwise, when the corresponding "-" button is pressed, the air pump works to deflate, the pair of airbags A contract, and the inner panel returns to its position closest to the outer panel (initial position) due to the tension of the mesh fabric. The user can easily perform the lumbar support operation by simply pressing a button, which is very convenient and improves user comfort. It can also adapt to people of different body types, improving convenience.

[0014] Preferably, the inflation assembly further includes a pair of airbags B, and an air guide tube B is connected to the air pump. The outer end of the air guide tube B is connected to a three-way tube, and the two sides of the three-way tube are respectively connected to the air nozzles B of the pair of airbags B. Two connection holes are opened in the middle of the inner plate of the lumbar support. The pair of airbags B are attached to the outer surface of the inner plate of the lumbar support, and the air nozzles B of the airbags B are inserted into the connection holes.

[0015] The control unit can control the air pump to inflate one airbag B while deflating the other airbag B. By periodically inflating and deflating the pair of airbags B, the pair of airbags B can alternately press against the waist and relax.

[0016] Preferably, airbag A and airbag B are corrugated airbags.

[0017] Preferably, the guide sleeve includes a first guide sleeve and a second guide sleeve. The first guide sleeve is formed on the bottom surface of the assembly groove, and the second guide sleeve is formed on the back of the waist support inner plate. The first guide sleeve is sleeved on the outside of the second guide sleeve. When the airbag A pushes the waist support inner plate forward, the outer wall of the second guide sleeve moves forward against the inner wall of the first guide sleeve.

[0018] Preferably, the outer walls of the first guide sleeve and the second guide sleeve are provided with multiple reinforcing ribs in the circumferential direction.

[0019] Preferably, the inner sides of the first guide sleeve and the second guide sleeve are provided with opposing support bosses, and the side walls of the first guide sleeve and the second guide sleeve are respectively provided with clearance openings; the support boss located on the inner side of the first guide sleeve is provided with an insertion hole in the middle, and a connection port corresponding to the clearance opening is provided on the side wall of the support boss. The connection port extends inward and communicates with the insertion hole. The air nozzle A of the airbag A is inserted into the insertion hole and its side end extends out and connects to the air duct A; the two end faces of the airbag A abut against the two support bosses on both sides, and multiple weight-reducing grooves are formed in the inner circumference of the support bosses.

[0020] Preferably, the lower part of the backrest shell is provided with a mounting groove, the control host box is disposed in the mounting groove, the side end and the front end of the mounting groove form a mounting port and a heat dissipation port respectively, the upper end of the mounting groove is provided with two cuts, and a hanging plate is formed between the two cuts. An elastic pressure ring is fitted on the hanging plate to abut against the upper end of the control host box.

[0021] Preferably, the backrest also includes a front frame, with the edge of the mesh fabric clamped between the front frame and the backrest shell. The back of the front frame is provided with multiple connecting posts circumferentially, and the connecting posts are provided with connecting grooves. The front surface of the backrest shell is provided with connecting seats corresponding to the multiple connecting posts circumferentially, and the front end of the connecting seat extends into the connecting groove. Screws are screwed into the connecting posts and the connecting seats to fix the front frame, mesh fabric and backrest shell together.

[0022] Preferably, the lower part of the back frame is formed with a mounting base, and the upper part of the back of the lumbar support shell is provided with a connecting shaft protruding from it. The two sides of the connecting shaft form arc-shaped grooves. The upper two sides of the mounting base are provided with mating seats whose front ends abut against the arc-shaped grooves. Bolts are inserted into the mating seats and the connecting shaft to hinge the mounting base and the lumbar support. The mounting base and the lumbar support shell are respectively formed with a first mounting groove and a second mounting groove. The lower two sides of the mounting base extend forward into the second mounting groove. The bottom surfaces of the first mounting groove and the second mounting groove are provided with opposing cross ribs. The two ends of a spring are sleeved on the cross ribs, and the outer side of the cross ribs forms a groove.

[0023] The front surface of the backrest shell forms a reinforcing platform corresponding to the second mounting groove, and the reinforcing platform is provided with multiple clips for holding the air duct A.

[0024] An office chair, characterized in that it includes an airbag-type lumbar support structure as described in any one of the above-mentioned methods.

[0025] The present invention adopts the above technical solution and has the following beneficial effects:

[0026] ① The lumbar support includes a back cover and an inner panel. An inflation assembly is installed inside the back cover, comprising a control unit, an air pump, a control panel, and a pair of airbags A. The pair of airbags A are positioned in guide tubes on the left and right sides between the inner panel and the outer panel. When the user presses the corresponding "+" button on the outer panel, the air pump inflates the pair of airbags A, pushing the inner panel forward to support the lower back. Conversely, pressing the corresponding "-" button deflates the air pump, causing the pair of airbags A to contract. The inner panel, due to the tension of the mesh fabric, retracts to its initial position closest to the outer panel. The user can easily operate the lumbar support by simply pressing a button, greatly improving user comfort and adapting to different body types, thus enhancing convenience.

[0027] ② The lumbar support also includes a pair of airbags B, which are fixed to the front surface of the inner panel of the lumbar support. When the user presses the "≈" (massage button), the air pump works, periodically inflating one airbag B while simultaneously deflating the other airbag B. This periodic action allows the pair of airbags B to intermittently extend and retract, tapping the user's waist. That is, the left and right sides alternately push against the waist and relax, realizing the waist massage function, further improving the user's comfort and effectively enhancing the user experience.

[0028] ③ The airbag uses a corrugated airbag (air spring), which has strong durability and deformation recovery ability, and the airbag is not easy to fail during expansion and contraction, and has good stability; in addition, the corrugated airbag itself has a certain degree of flexibility, which can also play a certain elastic support role when contracting, improving comfort.

[0029] ④ The front surface of the inner panel of the waist support supports the waist, with a large support area and strong resistance, providing good waist support and avoiding the problem of insufficient support caused by large-area mesh support.

[0030] ⑤ The upper part of the back of the lumbar support shell is hinged to the mounting base of the back frame. A spring is installed between the mounting base and the lumbar support shell to provide elastic support. This allows the lumbar support to rotate relative to the back frame under elastic force, adapting to fit the waist and further improving the support force and comfort of the lumbar support. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the installation structure of the lumbar support.

[0032] Figure 2 This is a schematic diagram of the assembly structure of the lumbar support and the back frame.

[0033] Figure 3 This is a schematic diagram showing the exploded structure of the lumbar support and back frame.

[0034] Figure 4 This is a schematic diagram of the three-dimensional structure of the lumbar support.

[0035] Figure 5 This is a schematic diagram of the exploded structure of a lumbar support.

[0036] Figure 6 This is a schematic diagram of the assembly of the lumbar support back cover and the inflatable components.

[0037] Figure 7 This is an assembly diagram of the lumbar support back cover and the inflatable assembly from another perspective.

[0038] Figure 8 This is a three-dimensional structural diagram of the inflatable component.

[0039] Figure 9 This is a schematic diagram of the three-dimensional structure of the lumbar support backrest shell.

[0040] Figure 10 This is a three-dimensional structural diagram of the inner panel of the lumbar support.

[0041] Figure 11 This is a schematic diagram of the three-dimensional structure of the front frame.

[0042] Figure 12 This is a schematic diagram showing the arrangement of the second mounting groove and cross-shaped ribs on the back of the lumbar support shell.

[0043] Figure 13 This is a schematic diagram showing the arrangement of the mounting brackets on the back frame. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] like Figures 1-13 The illustrated airbag-type lumbar support structure includes a back frame 1 and a lumbar support 2 hinged to the back frame 1. The lumbar support 2 includes a lumbar support back shell 3 and an inner lumbar support plate 4 disposed in front of the lumbar support back shell 3. The inner surface of the lumbar support back shell 3 is recessed to form an assembly groove 5. A mesh fabric is provided on the lumbar support back shell 3 and adheres to the outer surface of the inner lumbar support plate 4. An inflation assembly is provided on the lumbar support back shell 3, the inflation assembly including:

[0050] An air pump 6 is installed in the assembly slot 5 and is connected to a pair of airbags A8 via two air guide pipes A7 respectively;

[0051] The control unit box 9 is located at the lower part of the backrest shell 3 and is electrically connected to the air pump 6, which is suitable for controlling the air pump 6 to inflate and deflate a pair of airbags A8.

[0052] The control panel 10 is located on the outer wall of the backrest shell 3. The control panel 10 is equipped with multiple control buttons 11, which are suitable for inputting control commands to the control host box 9.

[0053] A pair of airbags A8 are respectively installed in the guide tubes on both sides between the backrest shell 3 and the inner plate of the backrest 4. The airbags A8 are configured to extend and push the inner plate of the backrest 4 forward to press against the waist and tighten the mesh when inflated; and to contract and release the inner plate of the backrest 4 when deflated, so that the inner plate of the backrest 4 can return to the initial position under the tension of the mesh.

[0054] In the above technical solution, the lumbar support includes a back shell and an inner panel. An inflation assembly is installed inside the back shell, which includes a control unit, an air pump, a control panel, and a pair of airbags A. The pair of airbags A are placed in the left and right guide tubes between the inner panel and the outer shell. When the user presses the corresponding "+" button on the outer panel, the air pump works to inflate the pair of airbags A, pushing the inner panel forward to support the waist. Otherwise, when the corresponding "-" button is pressed, the air pump works to deflate, the pair of airbags A contract, and the inner panel returns to its position closest to the outer panel (initial position) due to the tension of the mesh fabric. The user can easily perform the lumbar support operation by simply pressing a button, which is very convenient and improves user comfort. It can also adapt to people of different body types, improving convenience.

[0055] It should be noted that the control panel has four buttons: a power button, a "+" button, a "-" button, and a "≈" button (massage button).

[0056] The front surface of the inner panel of the lumbar support provides significant lumbar support with a large support area and strong resistance, resulting in excellent lumbar support and avoiding the problem of insufficient support caused by large-area mesh support.

[0057] Furthermore, the inflation assembly also includes a pair of airbags B12, and an air guide tube B13 is connected to the air pump 6. The outer end of the air guide tube B13 is connected to a three-way tube 14. The two sides of the three-way tube 14 are respectively connected to the air nozzles B15 of the pair of airbags B12. Two connection holes 16 are opened in the middle of the lumbar inner plate 4. The pair of airbags B12 are attached to the outer surface of the lumbar inner plate 4, and the air nozzles B15 of the airbags B12 are inserted into the connection holes 16.

[0058] The control unit 9 can control the air pump 6 to inflate one airbag B12 while deflating the other airbag B12. By periodically inflating and deflating the pair of airbags B12, the pair of airbags B12 can alternately press against the waist and relax.

[0059] In the above technical solution, the lumbar support also includes a pair of airbags B, which are fixed to the front surface of the inner panel of the lumbar support. When the user presses the button “≈” (massage button), the air pump works, periodically inflating one airbag B while simultaneously deflating the other airbag B. This periodic action allows the pair of airbags B to intermittently extend and retract, tapping the user's waist, that is, the left and right sides alternately pressing against and relaxing the waist, realizing the waist massage function, further improving the user's comfort, and effectively enhancing the user experience.

[0060] Furthermore, airbags A8 and B12 are corrugated airbags. In this technical solution, airbags A and B adopt corrugated airbags (air springs), which have strong durability and deformation recovery ability, are not prone to failure during expansion and contraction, and have good stability; in addition, the corrugated airbag itself has a certain degree of flexibility, which can also play a certain elastic support role when contracting, thereby improving comfort.

[0061] Furthermore, the guide cylinder includes a first guide sleeve 17 and a second guide sleeve 18. The first guide sleeve 17 is formed on the bottom surface of the assembly groove 5, and the second guide sleeve 18 is formed on the back of the lumbar support inner plate 4. The first guide sleeve 17 is sleeved on the outside of the second guide sleeve 18. When the airbag A8 pushes the lumbar support inner plate 4 forward, the outer wall of the second guide sleeve 18 moves forward against the inner wall of the first guide sleeve 17. In this technical solution, the guide cylinder adopts a nested structure of the first guide sleeve and the second guide sleeve, which enables the lumbar support inner plate to move smoothly along a straight line under the push of the airbag, avoiding deviation or shaking, and improving the stability and motion accuracy of the structure.

[0062] Furthermore, the outer walls of the first guide sleeve 17 and the second guide sleeve 18 are provided with multiple reinforcing ribs 19 in the circumferential direction. In this technical solution, the reinforcing ribs on the outer wall of the guide sleeve enhance the structural strength and deformation resistance of the guide sleeve, ensuring that it is not easily damaged during repeated pushing and pulling, and extending its service life.

[0063] Furthermore, the inner sides of the first guide sleeve 17 and the second guide sleeve 18 are provided with opposing support bosses 20, and the side walls of the first guide sleeve 17 and the second guide sleeve 18 are respectively provided with clearance openings 21; the support boss 20 located on the inner side of the first guide sleeve 17 is provided with an insertion hole 22 in the middle, and a connection port 23 corresponding to the clearance opening 21 is provided on the side wall of the support boss 20. The connection port 23 extends inward and communicates with the insertion hole 22. The air nozzle A44 of the airbag A8 is inserted into the insertion hole 22 and its side end extends out and connects to the air guide tube A7; the two end faces of the airbag A8 abut against the two support bosses 20 on both sides, and multiple weight-reducing grooves 24 are formed in the inner circumference of the support bosses 20. In this technical solution, the design of the support bosses ensures the flatness of the support on both sides of the airbag A, and the design of the clearance opening, connection port and insertion hole facilitates the installation of the airbag nozzle and the connection with the air guide tube. At the same time, the weight-reducing grooves in the support bosses reduce the overall weight and optimize the structural load distribution.

[0064] Furthermore, the lower part of the backrest shell 3 is provided with a mounting groove 25, and the control host box 9 is disposed in the mounting groove 25. The side end and front end of the mounting groove 25 respectively form a mounting opening 26 and a heat dissipation opening 27. The upper end of the mounting groove 25 is provided with two cuts 28, and a hanging plate 29 is formed between the two cuts 28. An elastic pressure ring 30 is fitted on the hanging plate 29 to abut against the upper end of the control host box 9. In this technical solution, the design of the mounting opening facilitates the installation of the control host box, and the heat dissipation opening facilitates the heat dissipation of the control host box, improving the reliability and service life of electrical components; the control host box is fixed by the elastic pressure ring, making the installation stable and easy to disassemble and assemble.

[0065] Furthermore, it also includes a front frame 31, with the edge of the mesh fabric clamped between the front frame 31 and the backrest shell 3. The back of the front frame 31 has multiple connecting posts 32 circumferentially arranged, each with a connecting groove 33. The front surface of the backrest shell 3 has connecting seats 34 circumferentially arranged corresponding to the connecting posts 32. The front end of the connecting seat 34 extends into the connecting groove 33. Screws are screwed into the connecting posts 32 and the connecting seats 34 to securely connect the front frame 31, the mesh fabric, and the backrest shell 3. In this technical solution, the mesh fabric is securely clamped through the cooperation of the front frame, connecting posts, and connecting seats.

[0066] Furthermore, the lower part of the back frame 1 is formed with a mounting base 35, and the upper part of the back of the lumbar back shell 3 is provided with a connecting shaft 36. The two sides of the connecting shaft 36 form arc-shaped grooves 37. The upper two sides of the mounting base 35 are provided with mating seats 38 whose front ends abut against the arc-shaped grooves 37. Bolts are inserted into the mating seats 38 and the connecting shaft 36 to hinge the mounting base 35 and the lumbar back 2. The mounting base 35 and the lumbar back shell 3 are respectively formed with a first mounting groove 25 and a second mounting groove 25. The lower two sides of the mounting base 35 extend forward into the second mounting groove 25. The bottom surfaces of the first mounting groove 25 and the second mounting groove 25 are provided with opposing cross ribs 39. The two ends of a spring are sleeved on the cross ribs 39, and the outer side of the cross ribs 39 forms a groove 40.

[0067] The front surface of the backrest shell 3 forms a reinforcing platform 41 corresponding to the second mounting groove 25. Multiple fixing plates 42 protrude from the reinforcing platform 41, and clamps 43 for holding the air duct A7 are formed on the fixing plates 42.

[0068] In the above technical solution, the upper back of the lumbar support shell is hinged to the mounting base of the back frame. A spring is installed between the mounting base and the lumbar support shell to provide elastic support. This allows the lumbar support to rotate relative to the back frame under elastic force, adapting to fit the waist and further improving the lumbar support's resistance, comfort, and adaptability to different sitting postures. The clamps on the fixing plate are used to fix the air tube, which supports and organizes the tube (especially air tube A) to prevent the air tube from loosening or wearing during movement.

[0069] This utility model also discloses an office chair, including one of the above-mentioned airbag-type lumbar support structures, which enables the office chair to have adjustable back and forth, massage and rotatable lumbar support functions, thereby improving the overall comfort and health support performance of the chair.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An airbag-type lumbar support structure, comprising a back frame (1) and a lumbar support (2) hinged to the back frame (1); characterized in that: The lumbar support (2) includes a lumbar support back shell (3) and a lumbar support inner plate (4) disposed in front of the lumbar support back shell (3). The inner surface of the lumbar support back shell (3) is recessed to form an assembly groove (5). A mesh fabric is provided on the lumbar support back shell (3) and attached to the outer surface of the lumbar support inner plate (4). The lumbar support back shell (3) is provided with an inflation assembly, which includes: An air pump (6) is installed in the assembly slot (5) and connected to a pair of airbags A (8) through two air guide pipes A (7); The control unit box (9) is located at the lower part of the backrest shell (3) and electrically connected to the air pump (6), which is suitable for controlling the air pump (6) to inflate and deflate a pair of airbags A (8); The control panel (10) is located on the outer wall of the backrest shell (3). The control panel (10) is equipped with multiple control buttons (11) for inputting control commands to the control host box (9). A pair of airbags A (8) are respectively installed in the guide tubes on both sides between the backrest shell (3) and the inner plate of the backrest (4). The airbags A (8) are configured to extend and push the inner plate of the backrest (4) forward to press against the waist and tighten the mesh when inflated; and to contract and release the inner plate of the backrest (4) when deflated, so that the inner plate of the backrest (4) can return to the initial position under the tension of the mesh.

2. The airbag-type top and waist structure according to claim 1, characterized in that: The inflation assembly also includes a pair of airbags B (12). An air guide tube B (13) is connected to the air pump (6). A three-way tube (14) is connected to the outer end of the air guide tube B (13). The two sides of the three-way tube (14) are respectively connected to the air nozzles B (15) of the pair of airbags B (12). Two connecting holes (16) are opened in the middle of the waist support inner plate (4). The pair of airbags B (12) are attached to the outer surface of the waist support inner plate (4). The air nozzles B (15) of the airbags B (12) are inserted into the connecting holes (16). The control unit (9) can control the air pump (6) to inflate one airbag B (12) while deflating the other airbag B (12). In this way, by periodically inflating and deflating a pair of airbags B (12), the pair of airbags B (12) can alternately press against the waist and relax.

3. The airbag-type top and waist structure according to claim 2, characterized in that: The airbags A (8) and B (12) are corrugated airbags.

4. The airbag-type top and waist structure according to claim 1, characterized in that: The guide sleeve includes a first guide sleeve (17) and a second guide sleeve (18). The first guide sleeve (17) is formed on the bottom surface of the assembly groove (5), and the second guide sleeve (18) is formed on the back of the waist support inner plate (4). The first guide sleeve (17) is sleeved on the outside of the second guide sleeve (18). When the airbag A (8) pushes the waist support inner plate (4) forward, the outer wall of the second guide sleeve (18) moves forward in contact with the inner wall of the first guide sleeve (17).

5. The airbag-type top waist structure according to claim 4, characterized in that: The outer walls of the first guide sleeve (17) and the second guide sleeve (18) are provided with multiple reinforcing ribs (19) in the circumferential direction.

6. The airbag-type top and waist structure according to claim 4, characterized in that: The first guide sleeve (17) and the second guide sleeve (18) have opposing support bosses (20) on their inner sides. The first guide sleeve (17) and the second guide sleeve (18) have corresponding clearance openings (21) on their side walls. The support boss (20) located inside the first guide sleeve (17) has an insertion hole (22) in the middle. The support boss (20) has a connection port (23) on its side wall that corresponds to the clearance opening (21). The connection port (23) extends inward and communicates with the insertion hole (22). The air nozzle A (44) of the airbag A (8) is inserted into the insertion hole (22) and its side end extends out and connects with the air guide tube A (7). The two end faces of the airbag A (8) abut against the two support bosses (20) on both sides. Multiple weight reduction grooves (24) are formed in the circumferential direction inside the support bosses (20).

7. The airbag-type top and waist structure according to claim 1, characterized in that: The lower part of the backrest shell (3) is provided with a mounting groove (25), and the control host box (9) is set in the mounting groove (25). The side end and front end of the mounting groove (25) respectively form a mounting port (26) and a heat dissipation port (27). The upper end of the mounting groove (25) is provided with two cuts (28), and a hanging plate (29) is formed between the two cuts (28). An elastic pressure ring (30) is fitted on the hanging plate (29) to abut against the upper end of the control host box (9).

8. The airbag-type top and waist structure according to claim 1, characterized in that: It also includes a front frame (31), the edge of the mesh fabric is clamped between the front frame (31) and the backrest shell (3), the back of the front frame (31) is provided with multiple connecting posts (32) in the circumferential direction, the connecting posts (32) are provided with connecting grooves (33), the front surface of the backrest shell (3) is provided with connecting seats (34) corresponding to the multiple connecting posts (32) in the circumferential direction, the front end of the connecting seat (34) extends into the connecting groove (33), and screws are screwed into the connecting posts (32) and the connecting seat (34) to fix the front frame (31), the mesh fabric and the backrest shell (3) in place.

9. The airbag-type top and waist structure according to claim 1, characterized in that: The lower part of the back frame (1) is formed with a mounting base (35) downwards. The upper part of the back of the lumbar back shell (3) is provided with a connecting shaft (36). The two sides of the connecting shaft (36) form arc grooves (37). The upper two sides of the mounting base (35) are provided with mating seats (38) whose front ends abut against the arc grooves (37). Bolts are inserted into the mating seats (38) and the connecting shaft (36) to hinge the mounting base (35) and the lumbar back (2). The mounting base (35) and the lumbar back shell (3) respectively form a first mounting groove (25) and a second mounting groove (25). The lower two sides of the mounting base (35) extend forward into the second mounting groove (25). The bottom surfaces of the first mounting groove (25) and the second mounting groove (25) are provided with opposing cross ribs (39). The two ends of a spring are sleeved on the cross ribs (39). The outer side of the cross ribs (39) forms a groove (40). The front surface of the backrest shell (3) forms a reinforcing platform (41) corresponding to the second mounting groove (25). Multiple fixing plates (42) protrude from the reinforcing platform (41), and clamps (43) for clamping the air duct A (7) are formed on the fixing plates (42).

10. An office chair, characterized in that: Including an airbag-type top waist structure as described in any one of claims 1 to 9.

Images