Elastic support type office chair

Abstract

The utility model provides an office chair of elastic support type, including support frame and backrest frame, backrest frame is fixed on support frame, support frame bottom is fixed with support foot, the vertical sliding of support frame is equipped with the seat plate, be equipped with two backrest plates on backrest frame and relative sliding set up, two backrest plate mutually deviate one side are hinged and are equipped with side brace, two side brace are used for with the elastic abutment of user back two sides, the sliding of backrest frame and with support frame between is equipped with waist rest block, when two backrest plate is close, two side brace is to the opposite side deflection. The device has the advantages of self -adaptation elastic support to user waist, back.

Description

Technical Field

[0001] This invention relates to the field of office chair design technology, and in particular to a flexible support office chair. Background Technology

[0002] Office chairs refer to various chairs provided for convenience in daily work and social activities. Office partners divide office chairs into narrow and broad senses. In a narrow sense, office chairs refer to backrest chairs used when people are doing desktop work in a seated position. In a broad sense, office chairs refer to all chairs used in offices.

[0003] The utility model patent with publication number CN218635640U, entitled "An Auxiliary Installation Structure for an Office Chair", discloses an office chair cushion, an office chair backrest, an office chair armrest, a first auxiliary installation mechanism, a second auxiliary installation mechanism, a first support mechanism, and a second support mechanism. The office chair backrest is fixedly installed at the rear end of the office chair cushion, the office chair armrest is fixedly installed at the upper end of the office chair cushion, and the first auxiliary installation mechanism is located at the lower end of the office chair cushion.

[0004] Similar to the aforementioned office chairs, these chairs cannot adapt to fit the user's back and provide weak support for the back and waist, which can easily lead to muscle fatigue in the lower back during long hours of work. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an elastic support office chair to solve the technical problem that existing office chairs cannot adaptively conform to the user's back and have weak support.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A flexible support office chair includes a support frame and a backrest frame. The backrest frame is fixed to the support frame, and support legs are fixed to the bottom of the support frame. A seat is vertically slidable on the support frame. Two horizontally slidably arranged backrest panels are provided on the backrest frame. Side support strips are hinged to the opposite sides of the two backrest panels. The two side support strips are used to elastically abut against the sides of the user's back. A lumbar support block is slidably provided on the backrest frame and between it and the support frame. A first drive cavity is provided at the bottom of the support frame. A second drive cavity communicating with the first drive cavity is provided on the side of the support frame opposite to the backrest panels. The bottom of the seat extends slidably into the first drive cavity. A first drive member is provided in the first drive cavity. The first drive member is used to drive the lumbar support block to extend or retract towards the user's waist when the seat slides. A second drive member is provided in the second drive cavity. The second drive member is used to drive the two backrest panels to move closer or further away when the seat slides. When the two backrest panels move closer, the two side support strips deflect towards their opposite sides.

[0008] The present invention is further configured such that: the first driving component includes a driving frame, a first rack, a first double gear, a driving rack, a second double gear, and a lumbar support rack; the driving frame is fixedly mounted on the bottom of the seat plate and extends into the first driving cavity; the first rack is vertically fixedly mounted on the driving frame; a first driving rod is horizontally rotatably mounted within the first driving cavity; the first double gear is fixedly sleeved on the first driving rod; the gear with fewer teeth in the first double gear meshes with the first rack; the driving rack is horizontally slidably mounted within the first driving cavity; one end of the driving rack meshes with the gear with more teeth in the first double gear; a second driving rod is horizontally rotatably mounted within the first driving cavity; the second double gear is fixedly sleeved on the second driving rod; the end of the driving rack away from the first double gear meshes with the gear with fewer teeth in the second double gear; the lumbar support rack is slidably mounted within the first driving cavity and meshes with the gear with more teeth in the second double gear; the end of the lumbar support rack away from the second double gear is connected to a lumbar support block.

[0009] The invention is further configured such that: a limiting tube with an internal limiting protrusion is fixed on the backrest frame; one end of the limiting tube extends into the first driving cavity; the other end of the limiting tube faces the user's waist; a limiting rod with a limiting groove corresponding to the limiting protrusion is slidably provided inside the limiting tube; the lumbar support block is rotatably disposed at one end of the limiting rod; a driving groove is provided inside the limiting rod; one end of the lumbar support rack slides into the driving groove; a driving spring is also provided inside the driving groove; and the two ends of the driving spring are fixedly connected to the bottom of the driving groove and the lumbar support rack, respectively.

[0010] The present invention is further configured such that: a plurality of vertical rods are provided vertically in the first driving cavity, the driving frame is slidably mounted on the plurality of vertical rods, and a return spring is sleeved on each of the plurality of vertical rods, the two ends of the return spring being fixedly connected to the bottom of the driving frame and the corresponding side wall of the vertical rod, respectively.

[0011] The present invention is further configured such that: the second driving component includes a plurality of steel ropes, a winding wheel, and a belt drive assembly; one end of each of the steel ropes is fixedly connected to the corresponding side wall of the backrest panel; a third driving rod is horizontally rotatably disposed within the second driving cavity; the winding wheel is fixedly sleeved on the third driving rod; the other end of each of the steel ropes extends into the second driving cavity and is fixedly wound around the winding wheel; and the belt drive assembly is disposed between the second driving rod and the third driving rod.

[0012] The present invention is further configured such that: an installation groove is provided on the backrest frame, a sliding rod is horizontally provided in the installation groove, both backrest panels are slidably mounted on the sliding rod, and a compression spring is sleeved on the sliding rod and located between the two backrest panels.

[0013] The present invention is further configured such that: an arc-shaped elastic strip is fixed on the backrest frame, a strip-shaped groove with a "T"-shaped cross-section is opened on the side support strip, and a "T"-shaped block with a sliding connection to the groove is fixed on the side wall of the elastic strip away from the backrest frame.

[0014] The present invention is further configured such that: the support frame has a connecting groove communicating with the first driving cavity, and the seat plate is vertically slidably disposed in the connecting groove.

[0015] The present invention is further configured such that: the seat, the two backrests and the two side support strips are all provided with elastic support sponges.

[0016] The present invention is further configured such that handrails are provided on opposite sides of the support frame.

[0017] Compared to the beneficial effects achieved by existing technologies;

[0018] By setting the vertical sliding of the seat as the sole power source for the entire linkage mechanism, and with the help of the first and second drive components located in the first and second drive cavities, the forward extension of the lumbar support block and the relative closeness of the two backrests are automatically and synchronously triggered by the single action of the user sitting down. Without any manual adjustment or power intervention, the continuous action of establishing lumbar support and closing the sides of the back can be completed the moment the user sits down.

[0019] When the two backrest panels are driven to approach each other, the two side support bars hinged to their outer sides do not clamp inwards, but instead deflect outwards toward the opposite sides, actively avoiding the initial contact surface of the user's back. This eliminates the squeezing and impact sensation on the sides of the back caused by conventional inward-clamping support mechanisms when they are closed. After the side support bars deflect outwards, they form an elastic contact with the sides of the user's back, providing a stretching tension that conforms to the direction of the user's back muscles, significantly improving the sense of openness and comfort of the back during long periods of sitting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the overall structure of an embodiment of the present invention;

[0022] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A;

[0023] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B;

[0024] Figure 5 for Figure 2 Enlarged schematic diagram of the structure at point C;

[0025] Figure 6 This is a front view of the overall structure of the office chair back.

[0026] Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point D;

[0027] Figure 8 This is a schematic diagram of the connection structure between the side support bars and the backrest frame.

[0028] Figure 9 This is a partial cross-sectional schematic diagram of the connection between the elastic strip and the side support strip.

[0029] In the above attached figures: 1. Support frame; 2. Backrest frame; 3. Support leg; 4. Seat board; 5. Backrest board; 6. Side support bar; 7. Lumbar support block; 8. First drive chamber; 9. Second drive chamber; 10. Drive frame; 11. First rack; 12. First double gear; 13. Drive rack; 14. Second double gear; 15. Lumbar support rack; 16. First drive rod; 17. Second drive rod; 18. Limiting tube; 19. Limiting rod; 20. Drive groove; 21. Drive spring; 22. Vertical rod; 23. Return spring; 24. Steel rope; 25. Rewinding reel; 26. Belt drive assembly; 27. Third drive rod; 28. Mounting groove; 29. ​​Slide rod; 30. Compression spring; 31. Elastic strip; 32. Slot; 33. Locking block; 34. Connecting groove; 35. Supporting sponge; 36. Armrest. Detailed Implementation

[0030] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Example:

[0032] Reference Figure 1 and Figure 2 This invention relates to a flexible support office chair, comprising a support frame 1 and a backrest frame 2. The backrest frame 2 is fixedly mounted on the support frame 1. Support legs 3 are fixedly mounted at the bottom of the support frame 1, and armrests are provided on opposite sides of the support frame 1. A seat 4 is vertically slidable on the support frame 1. Figure 2 and Figure 3 As shown, the support frame 1 has a first driving cavity 8 at its bottom, and a connecting groove 34 communicating with the first driving cavity 8 is provided on the support frame 1. The seat plate 4 is vertically slidably disposed in the connecting groove 34, and the bottom of the seat plate 4 abuts against the bottom of the connecting groove 34 after the user sits down. Figure 6 and Figure 7As shown, the backrest frame 2 has two horizontally slidably arranged backrest panels 5. The backrest frame 2 has an installation groove 28, and a horizontal sliding rod 29 is provided in the installation groove 28. Both backrest panels 5 are slidably arranged on the sliding rod 29. A compression spring 30 is sleeved on the sliding rod 29 and located between the two backrest panels 5. The sliding rod 29 provides precise guidance for the horizontal relative sliding of the two backrest panels 5, ensuring the smooth and synchronous movement of the backrest panels 5 as they move closer or further away. The compression spring 30 between the two backrest panels 5 allows the backrest panels 5 to automatically return to their initial open state after the driving force is lost.

[0033] like Figure 1 , Figure 8 and Figure 9 As shown, each of the two backrest panels 5 is hinged with a side support strip 6 on one side away from each other. When the two backrest panels 5 are close together, the two side support strips 6 deflect towards the opposite side. The two side support strips 6 are used to elastically abut against the sides of the user's back. An arc-shaped elastic strip 31 is fixed on the backrest frame 2. A strip-shaped groove 32 with a "T"-shaped cross section is opened on the side support strip 6. A "T"-shaped locking block 33 is fixed on the side wall of the elastic strip 31 away from the backrest frame 2 and is slidably connected to the groove 32. The sliding engagement between the arc-shaped elastic strip 31 and the "T"-shaped groove 32 on the side support strip 6 allows the elastic strip 31 to elastically deform and slide along the groove 32 when the side support strip 6 deflects outward. This engagement provides a flexible constraint on the deflection of the side support strip 6, ensuring that the side support strip 6 maintains elastic contact with the user's back rather than rigid pressure. Furthermore, the interlocking structure between the "T"-shaped block 33 and the groove 32 prevents the elastic strip 31 from detaching from the side support strip 6, ensuring reliable connection and smooth movement. After the side support strip 6 moves with the backrest panel 5, because the length of the elastic strip 31 remains constant, it will cause the side support strip 6 to deflect away from the corresponding backrest panel 5.

[0034] like Figure 2 , Figure 3 and Figure 4As shown, a lumbar support block 7 is slidably provided on the backrest frame 2 and between it and the support frame 1. The support frame 1 has a second drive cavity 9 communicating with the first drive cavity 8 on the side facing away from the backrest plate 5. The bottom of the seat plate 4 slides into the first drive cavity 8. A first drive component is provided in the first drive cavity 8. The first drive component is used to drive the lumbar support block 7 to extend or retract towards the user's waist when the seat plate 4 slides. The first drive component includes a drive frame 10, a first rack 11, a first double gear 12, a drive rack 13, a second double gear 14, and a lumbar support rack 15. The drive frame 10 is fixed to the bottom of the seat plate 4 and extends into the first drive cavity 8. A plurality of vertical rods 22 are vertically provided in the first drive cavity 8. The drive frame 10 slides through the plurality of vertical rods 22. A return spring 23 is sleeved on each of the plurality of vertical rods 22. The two ends of the return spring 23 are fixedly connected to the bottom of the drive frame 10 and the side wall of the corresponding vertical rod 22, respectively. The sliding cooperation between the drive frame 10 and several vertical rods 22 provides multi-point guidance for the vertical movement of the seat 4, ensuring that the force on the seat 4 is uniform and does not deviate during the sinking process. The return spring 23 enables the seat 4 to elastically return to the initial height after the user gets up, realizing the pure mechanical automatic reset of the reciprocating motion of the seat 4.

[0035] like Figure 2 , Figure 3 and Figure 4 As shown, the first rack 11 is vertically fixed on the drive frame 10. A first drive rod 16 is horizontally rotatably disposed in the first drive cavity 8. The first double gear 12 is fixedly sleeved on the first drive rod 16. The gear with fewer teeth in the first double gear 12 meshes with the first rack 11. The drive rack 13 is horizontally slidably disposed in the first drive cavity 8. One end of the drive rack 13 meshes with the gear with more teeth in the first double gear 12. A second drive rod 17 is horizontally rotatably disposed in the first drive cavity 8. The second double gear 14 is fixedly sleeved on the second drive rod 17. The end of the drive rack 13 away from the first double gear 12 meshes with the gear with fewer teeth in the second double gear 14. The waist support rack 15 is slidably disposed in the first drive cavity 8 and meshes with the gear with more teeth in the second double gear 14. The end of the waist support rack 15 away from the second double gear 14 is connected to the waist support block 7. Through the sequential meshing transmission of the above structure, the limited vertical sinking displacement of the seat plate 4 is gradually amplified and converted into the horizontal displacement of the lumbar support rack 15, so that the lumbar support block 7 can obtain sufficient forward extension stroke to fully fit the user's waist.

[0036] like Figure 2 and Figure 5As shown, a limiting tube 18 with an internal limiting protrusion is fixed on the backrest frame 2. One end of the limiting tube 18 extends into the first driving cavity 8, and the other end of the limiting tube 18 faces the user's waist. A limiting rod 19 with a limiting groove corresponding to the limiting protrusion is slidably provided inside the limiting tube 18. The waist support block 7 is rotatably provided at one end of the limiting rod 19. A driving groove 20 is provided inside the limiting rod 19. One end of the waist support rack 15 slides into the driving groove 20. A driving spring 21 is also provided inside the driving groove 20. The two ends of the driving spring 21 are fixedly connected to the bottom of the driving groove 20 and the waist support rack 15, respectively. By cooperating with the limiting protrusion and limiting groove of the limiting tube 18 and the limiting rod 19, the circumferential rotation of the limiting rod 19 is restricted, ensuring that the lumbar support block 7 will not deflect during the extension and retraction process. The lumbar support rack 15 is elastically connected to the limiting rod 19 through the drive spring 21, so that after the lumbar support block 7 extends forward and contacts the user's waist, if the user leans back further to apply pressure, the drive spring 21 can be compressed to provide elastic buffer, forming an elastic contact relationship between the lumbar support block 7 and the waist. This ensures the transmission of support force and avoids the discomfort caused by rigid pushing. The lumbar support block 7 is hinged through the pivot set at the end of the limiting rod 19, which improves the flexibility and self-adaptability of the lumbar support.

[0037] like Figure 2 and Figure 7 As shown, a second driving component is provided in the second driving cavity 9. The second driving component is used to drive the two backrest panels 5 to move closer or further away when the seat plate 4 slides. The second driving component includes several steel ropes 24, a winding wheel 25 and a belt drive assembly 26. One end of each of the steel ropes 24 is fixedly connected to the side wall of the corresponding backrest panel 5. A third driving rod 27 is horizontally rotatably provided in the second driving cavity 9. The winding wheel 25 is fixedly sleeved on the third driving rod 27. The other end of each of the steel ropes 24 extends into the second driving cavity 9 and is fixedly wound around the winding wheel 25. A pulley is rotatably provided on the backrest frame 2 to make the steel ropes 24 move smoothly. The belt drive assembly 26 is located between the second driving rod 17 and the third driving rod 27. Through the cooperation of steel rope 24 and winding wheel 25, the rotational motion of the third drive rod 27 is converted into the horizontal sliding of the backrest 5. The flexibility of steel rope 24 allows the transmission path to be flexibly arranged without being limited by linear transmission in space. The pulley ensures the smoothness of steel rope 24 during turning and movement, reducing friction loss. The belt drive group 26 is specifically composed of two pulleys and a belt, which synchronously transmits the rotation of the second drive rod 17 to the third drive rod 27, so that the forward extension of the lumbar support block 7 and the closing action of the backrest 5 share the same power source.

[0038] like Figure 1 and Figure 2As shown, the seat 4, the two backrests 5, and the two side support strips 6 are all equipped with elastic support foam 35. By providing elastic support foam 35 on the seat 4, backrests 5, and side support strips 6, the user's contact with the chair surface is further softened on the basis of the support force provided by the mechanical structure, the local pressure is evenly distributed, and the sitting comfort during long-term office work is improved.

[0039] Working principle:

[0040] When the user sits down, the seat 4 slides vertically downward along the connecting groove 34 under the influence of the user's weight until it comes into contact with the bottom of the groove. The drive frame 10 fixed at the bottom of the seat 4 moves down along the vertical rod 22 and compresses the return spring 23. At the same time, it drives the first rack 11 to move down. The first rack 11 drives the small gear of the first double gear 12 to rotate. The large gear rotates synchronously and pushes the drive rack 13 to move horizontally. The front end of the drive rack 13 further drives the small gear of the second double gear 14 to rotate. The large gear drives the lumbar support rack 15 to extend horizontally towards the user's waist. The front end of the lumbar support rack 15 pushes the limiting rod 19 to slide along the limiting tube 18 through the drive spring 21, so that the lumbar support block 7 hinged to the end of the limiting rod 19 extends forward smoothly and forms an elastic contact with the user's waist. When the user leans back and applies pressure, the drive spring 21 is compressed to provide cushioning.

[0041] At the same time, the second drive rod 17 rotates synchronously with the second double gear 14, driving the third drive rod 27 and the winding pulley 25 to rotate via the belt drive assembly 26. The winding pulley 25 tightens the steel rope 24, which, after being guided by the pulley, pulls the two backrest plates 5 towards each other along the slide rod 29, compressing the compression spring 30 on the slide rod 29. As the two backrest plates 5 approach each other, the side support bars 6 hinged to the outside of the backrest plates 5 are constrained by the arc-shaped elastic bar 31 and move away from each other. The side supports 31 deflect outwards, and the locking block 33 at the end of the elastic strip 31 slides along the locking groove 32 on the side support strip 6 and generates elastic deformation, so that the side support strip 6 forms elastic contact with the two sides of the user's back. When the user gets up, the return spring 23 pushes the drive frame 10 to move upwards, causing the seat 4 to rise. The transmission components move in the opposite direction, the lumbar support block 7 retracts, and the compression spring 30 pushes the two backrest panels 5 to reset and open. The side support strip 6 returns to its initial angle as the elastic strip 31 rebounds, and the whole chair returns to the ready-to-sit state.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flexible support office chair, comprising a support frame (1) and a backrest frame (2), wherein the backrest frame (2) is fixedly mounted on the support frame (1), and a support leg (3) is fixedly mounted at the bottom of the support frame (1), characterized in that: A seat plate (4) is vertically slidably mounted on the support frame (1). Two horizontally slidably mounted backrest plates (5) are mounted on the backrest frame (2). Side support strips (6) are hinged to the opposite sides of the two backrest plates (5). The two side support strips (6) are used to elastically abut against the sides of the user's back. A lumbar support block (7) is slidably mounted on the backrest frame (2) and between it and the support frame (1). A first drive cavity (8) is provided at the bottom of the support frame (1). A drive cavity (8) is provided on the side of the support frame (1) facing away from the backrest plates (5). The second drive cavity (9) is connected to the cavity (8). The bottom of the seat plate (4) slides into the first drive cavity (8). The first drive cavity (8) is provided with a first drive member. The first drive member is used to drive the lumbar support block (7) to extend or retract towards the user's waist when the seat plate (4) slides. The second drive cavity (9) is provided with a second drive member. The second drive member is used to drive the two backrests (5) to move closer or further away when the seat plate (4) slides. When the two backrests (5) move closer, the two side support bars (6) deflect towards opposite sides.

2. The elastic support office chair according to claim 1, characterized in that: The first driving component includes a drive frame (10), a first rack (11), a first double gear (12), a drive rack (13), a second double gear (14), and a lumbar support rack (15). The drive frame (10) is fixed to the bottom of the seat plate (4) and extends into the first drive cavity (8). The first rack (11) is vertically fixed on the drive frame (10). A first drive rod (16) is horizontally rotatably disposed in the first drive cavity (8). The first double gear (12) is fixedly sleeved on the first drive rod (16). The gear with the relatively fewer teeth of the first double gear (12) meshes with the first rack (11). The drive rack (13) slides horizontally. Located in the first drive cavity (8), one end of the drive rack (13) meshes with the gear with a relatively large number of teeth of the first double gear (12). A second drive rod (17) is horizontally rotatably provided in the first drive cavity (8). The second double gear (14) is fixedly sleeved on the second drive rod (17). The end of the drive rack (13) away from the first double gear (12) meshes with the gear with a relatively small number of teeth of the second double gear (14). The waist support rack (15) is slidably provided in the first drive cavity (8) and meshes with the gear with a relatively large number of teeth of the second double gear (14). The end of the waist support rack (15) away from the second double gear (14) is connected to the waist support block (7).

3. The elastic support office chair according to claim 2, characterized in that: The backrest frame (2) is fixedly provided with a limiting tube (18) with a limiting protrusion inside. One end of the limiting tube (18) extends into the first drive cavity (8), and the other end of the limiting tube (18) faces the user's waist. A limiting rod (19) with a limiting groove corresponding to the limiting protrusion is slidably provided in the limiting tube (18). The waist support block (7) is rotatably provided at one end of the limiting rod (19). A drive groove (20) is provided in the limiting rod (19). One end of the waist support rack (15) slides into the drive groove (20). A drive spring (21) is also provided in the drive groove (20). The two ends of the drive spring (21) are fixedly connected to the bottom of the drive groove (20) and the waist support rack (15) respectively.

4. The elastic support office chair according to claim 2, characterized in that: The first drive cavity (8) is provided with several vertical rods (22), and the drive frame (10) slides through the several vertical rods (22). Each of the several vertical rods (22) is fitted with a return spring (23), and the two ends of the return spring (23) are fixed to the bottom of the drive frame (10) and the side wall of the corresponding vertical rod (22), respectively.

5. The elastic support office chair according to claim 2, characterized in that: The second driving component includes several steel ropes (24), a winding wheel (25), and a belt drive assembly (26). One end of each of the steel ropes (24) is fixedly connected to the side wall of the corresponding backrest plate (5). A third driving rod (27) is horizontally rotatably provided in the second driving cavity (9). The winding wheel (25) is fixedly sleeved on the third driving rod (27). The other end of each of the steel ropes (24) extends into the second driving cavity (9) and is fixedly wound around the winding wheel (25). The belt drive assembly (26) is located between the second driving rod (17) and the third driving rod (27).

6. The elastic support office chair according to claim 1, characterized in that: The backrest frame (2) is provided with an installation groove (28), and a sliding rod (29) is horizontally provided in the installation groove (28). Both backrest panels (5) are slidably mounted on the sliding rod (29), and a compression spring (30) is sleeved on the sliding rod (29) and located between the two backrest panels (5).

7. The elastic support office chair according to claim 1, characterized in that: An arc-shaped elastic strip (31) is fixed on the backrest frame (2), and a strip-shaped slot (32) with a "T"-shaped cross section is opened on the side support strip (6). A "T"-shaped block (33) is fixed on the side wall of the elastic strip (31) away from the backrest frame (2) and is slidably connected to the slot (32).

8. The elastic support office chair according to claim 1, characterized in that: The support frame (1) has a connecting groove (34) that communicates with the first drive cavity (8), and the seat plate (4) is vertically slidably disposed in the connecting groove (34).

9. The elastic support office chair according to claim 1, characterized in that: The seat (4), the two backrests (5) and the two side support strips (6) are all provided with elastic support sponges (35).

10. The elastic support office chair according to claim 1, characterized in that: Handrails (36) are also provided on the opposite sides of the support frame (1).

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