Seat backrest supporting structure

Abstract

The utility model discloses a seat backrest supporting structure which comprises a base, one end of the top face of the base is fixedly connected with a first supporting column, the top end of the first supporting column is detachably connected with a second supporting column, the second supporting column is connected with a driving assembly, and the driving assembly is used for driving the second supporting column to move close to or away from the first supporting column in the vertical direction. The top end of the second supporting column is fixedly connected with a backrest fixing frame used for being fixedly connected with a backrest. The outer wall of the first supporting column is slidably connected with a waist rest fixing frame used for fixedly installing a waist rest, and an adjusting assembly is arranged on the outer wall of one side of the first supporting column and fixedly connected with the waist rest fixing frame. The height of the backrest and the height of the waist rest can be adjusted so as to meet the requirements of different users, and the applicability and the comfort degree are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a seat back support structure. Background Art

[0002] An office chair is a piece of furniture used for various tasks. It typically consists of a seat cushion, a backrest, a backrest support structure, armrests, and a base support structure. The seat cushion directly contacts the user, providing a comfortable sitting experience; the backrest provides support for the user's back, reducing back stress. The armrests support the user's arms. The base support structure is the chair's skeleton, responsible for supporting the weight of the entire chair and the user. The backrest support structure's primary function is to provide stable support for the backrest, ensuring it can bear the user's weight and maintain a stable posture.

[0003] Existing backrest support structures and backrests are usually designed as a whole, by placing fillers made of materials such as sponge, memory foam, latex or mesh on the support frame, and cutting and sewing them to fit the contour of the backrest. However, although this design ensures the comfort and support of the backrest, it has obvious deficiencies in flexibility. In particular, the height of the backrest cannot be adjusted, which means that it cannot perfectly adapt to the needs of users of different heights, body shapes or sitting habits, thereby limiting its universality and optimization of user experience. For example, the utility model patent with announcement number CN219895147U discloses an office chair backrest support angle adjustment structure. This utility model achieves the purpose of adjusting the backrest support angle. Whether it is working or studying at a desk, or relaxing, the backrest can be adjusted to play a good role in supporting the lumbar spine, relieving pressure more effectively, and can also be used during naps.

[0004] However, the technical solution of the aforementioned utility model patent does not address the issue of non-adjustable backrest height. For users with large differences in height, optimal support cannot be achieved simply by adjusting the angle. Furthermore, the height of the lumbar support in this patent cannot be adjusted, making it less practical.

[0005] Therefore, it is necessary to develop a seat back support structure for the above defects. Utility Model Content

[0006] The purpose of the utility model is to provide a seat back support structure, which can adjust the height of the backrest and the lumbar support to meet the needs of different users and improve the applicability and comfort.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The utility model provides a seat back support structure, including a base, one end of the top surface of the base is fixedly connected to a first support column, the top end of the first support column is detachably connected to a second support column, the second support column is connected to a driving component, and the driving component is used to drive the second support column to move closer to or away from the first support column in a vertical direction; the top end of the second support column is fixedly connected to a backrest fixing frame for fixing the backrest; a lumbar support fixing frame for fixing and installing a lumbar support is slidably connected to the outer wall of the first support column, and an adjustment component is provided on the outer wall of one side of the first support column, and the adjustment component is fixedly connected to the lumbar support fixing frame.

[0009] Furthermore, sliding holes are provided at both ends of the top surface of the first support column along its length direction, and reinforcing plates corresponding to the sliding holes are fixedly connected at both ends of the bottom surface of the second support column, and the two reinforcing plates are slidably connected in the two sliding holes respectively.

[0010] Furthermore, the driving assembly includes a threaded rod and a threaded barrel. A mounting hole is provided through the middle of the top surface of the first support column. One end of the threaded barrel is fixedly connected to the bottom surface of the second support column, and the other end of the threaded barrel is slidably connected to the mounting hole. One end of the threaded rod is threadedly connected to the threaded barrel, and the other end of the threaded rod passes through the base and is rotatably connected to the base.

[0011] Furthermore, one end of the threaded rod passes through the base and is fixedly connected to a knob.

[0012] Furthermore, the adjustment assembly includes a shell, a rack, a gear and a drive unit, the shell is fixedly connected to the lumbar support fixing frame, the rack is vertically fixedly connected to the outer wall of the first support column, the inner wall of the shell is rotatably connected to a rotating shaft, the gear is fixedly connected to the rotating shaft, and the gear is meshed with the rack; the drive unit is connected to the gear transmission and is used to drive the gear to rotate.

[0013] Furthermore, the driving unit includes a worm and a worm wheel, the worm is rotatably connected to the inner wall of the housing, the worm wheel is fixedly connected to the rotating shaft, and the worm and the worm wheel are meshed and driven.

[0014] Furthermore, one end of the worm passes through the housing and is fixedly connected to a rocker.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The utility model utilizes a detachable connection between a first support column and a second support column, and uses a drive assembly to drive the second support column to move vertically, thereby changing the height of the second support column and, in turn, the height of the backrest fixing frame. Simultaneously, by sliding the lumbar support fixing frame onto the first support column and adjusting the height of the lumbar support fixing frame via an adjustment assembly, the height of the backrest and lumbar support can be adjusted to suit the needs of different users, thereby improving the suitability and comfort of the chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model when the first support column and the second support column are separated;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model from another perspective.

[0021] Explanation of the accompanying drawings: 1. Base; 2. First support column; 3. Second support column; 4. Drive assembly; 401. Threaded rod; 402. Threaded cylinder; 5. Backrest fixing frame; 6. Lumbar support fixing frame; 7. Adjustment assembly; 701. Housing; 702. Rack; 703. Gear; 704. Rotating shaft; 705. Worm; 706. Worm wheel; 707. Rocker; 8. Slide hole; 9. Reinforcement plate; 10. Knob. DETAILED DESCRIPTION

[0022] The core of the utility model is to provide a seat back support structure, which can adjust the height of the backrest and the lumbar support to meet the needs of different users and improve applicability and comfort.

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] In one embodiment, Figures 1 to 3 As shown, it includes a base 1, one end of the top surface of the base 1 is fixedly connected to a first support column 2, the top of the first support column 2 is detachably connected to a second support column 3, the second support column 3 is connected to a driving component 4, the driving component 4 is used to drive the second support column 3 to move closer to or away from the first support column 2 in the vertical direction; the top of the second support column 3 is fixedly connected to a backrest fixing frame 5 for fixing the backrest; a lumbar support fixing frame 6 for fixedly installing a lumbar support is slidably connected to the outer wall of the first support column 2, and an adjustment component 7 is provided on the outer wall of one side of the first support column 2, and the adjustment component 7 is fixedly connected to the lumbar support fixing frame 6.

[0026] By detachably connecting the first support column 2 and the second support column 3, and by driving the second support column 3 vertically via the drive assembly 4, the height of the second support column 3 can be changed, thereby changing the height of the backrest bracket 5. At the same time, by slidingly connecting the lumbar support bracket 6 to the first support column 2 and adjusting the height of the lumbar support bracket 6 via the adjustment assembly 7, the height of the backrest and lumbar support can be adjusted to meet the needs of different users, thereby improving the serviceability and comfort of the chair.

[0027] In a specific embodiment, sliding holes 8 are provided at both ends of the top surface of the first support column 2 along its length direction, and reinforcing plates 9 corresponding to the sliding holes 8 are fixedly connected at both ends of the bottom surface of the second support column 3, which can enhance the connection strength between the first support column 2 and the second support column 3. The two reinforcing plates 9 are respectively slidably connected in the two sliding holes 8 and can slide in the sliding holes 8 following the movement of the first support column 2.

[0028] Specifically, the driving assembly 4 includes a threaded rod 401 and a threaded barrel 402. A mounting hole is provided through the middle of the top surface of the first support column 2. One end of the threaded barrel 402 is fixedly connected to the bottom surface of the second support column 3, and the other end of the threaded barrel 402 is slidably connected to the mounting hole. One end of the threaded rod 401 is threadedly connected to the threaded barrel 402, and the other end of the threaded rod 401 passes through the base 1 and is rotatably connected to the base 1.

[0029] The threaded rod 401 is rotated to drive the threaded cylinder 402 to slide in the mounting hole, thereby driving the second support column 3 fixedly connected to the threaded cylinder 402 to move closer to or away from the first support column 2.

[0030] Specifically, one end of the threaded rod 401 passes through the base 1 and is fixedly connected to the knob 10. It is convenient to manually rotate the threaded rod 401 to adjust the height of the backrest.

[0031] In a specific embodiment, the adjustment component 7 includes a shell 701, a rack 702, a gear 703 and a drive unit. The shell 701 is fixedly connected to the lumbar support bracket 6, the rack 702 is vertically fixedly connected to the outer wall of the first support column 2, the inner wall of the shell 701 is rotatably connected to the rotating shaft 704, the gear 703 is fixedly connected to the rotating shaft 704, and the gear 703 is meshed with the rack 702; the drive unit is transmission-connected to the gear 703 and is used to drive the gear 703 to rotate.

[0032] Specifically, the driving unit includes a worm 705 and a worm wheel 706 . The worm 705 is rotatably connected to the inner wall of the housing 701 , and the worm wheel 706 is fixedly connected to the rotating shaft 704 . The worm 705 and the worm wheel 706 are meshed and driven.

[0033] By rotating the worm 705, the worm wheel 706 is driven to rotate, and further the rotating shaft 704 is driven to rotate, thereby driving the gear 703 to rotate. Under the action of the rack 702 engaged therewith, the housing 701 and the lumbar support fixing frame 6 are driven to slide up and down on the outer wall of the first support column 2 to adjust the height of the lumbar support.

[0034] Specifically, one end of the worm 705 passes through the housing 701 and is fixedly connected to a rocker 707. The worm 705 can be manually rotated to adjust the lumbar support.

[0035] Working principle of the present invention: When the present invention is used, when the user needs to adjust the height of the seat back, he or she rotates the knob 10. The knob 10 is fixedly connected to the threaded rod 401, so the knob 10 will drive the threaded rod 401 to rotate. The threaded rod 401 and the threaded barrel 402 are threadedly connected. When the threaded rod 401 rotates, the threaded barrel 402 will move in the vertical direction along the threaded rod 401. The threaded barrel 402 is fixedly connected to the bottom surface of the second support column 3, so as the threaded barrel 402 moves, the second support column 3 will also move closer to or away from the first support column 2 in the vertical direction accordingly. The backrest fixing frame 5 at the top of the second support column 3 moves accordingly, thereby driving the seat back to rise or fall, thereby achieving height adjustment.

[0036] When the user needs to adjust the lumbar support position, they rotate the rocker 707, which is fixedly connected to the worm 705. This rotation of the rocker 707 drives the worm 705 to rotate. The rotation of the worm 705 drives the gear 703 through the worm gear mechanism. Because the gear 703 meshes with the rack 702, the rotation of the gear 703 translates into movement of the lumbar support bracket 6 along the rack 702. This movement of the lumbar support bracket 6 causes the lumbar support to change its position on the first support column 2, thereby adjusting the lumbar support position.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0038] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A seat back support structure, characterized in that: The invention comprises a base (1), wherein one end of the top surface of the base (1) is fixedly connected to a first support column (2), the top end of the first support column (2) is detachably connected to a second support column (3), the second support column (3) is connected to a driving component (4), and the driving component (4) is used to drive the second support column (3) to move vertically toward or away from the first support column (2); the top end of the second support column (3) is fixedly connected to a backrest fixing frame (5) for fixing a backrest; a lumbar support fixing frame (6) for fixing a lumbar support is slidably connected to the outer wall of the first support column (2), and an adjustment component (7) is provided on the outer wall of one side of the first support column (2), and the adjustment component (7) is fixedly connected to the lumbar support fixing frame (6).

2. The seat back support structure according to claim 1, characterized in that: Both ends of the top surface of the first support column (2) are provided with sliding holes (8) along the length direction thereof, and both ends of the bottom surface of the second support column (3) are fixedly connected with reinforcement plates (9) corresponding to the sliding holes (8), and the two reinforcement plates (9) are respectively slidably connected in the two sliding holes (8).

3. The seat back support structure according to claim 2, characterized in that: The driving assembly (4) comprises a threaded rod (401) and a threaded barrel (402); a mounting hole is provided through the middle position of the top surface of the first support column (2); one end of the threaded barrel (402) is fixedly connected to the bottom surface of the second support column (3); the other end of the threaded barrel (402) is slidably connected in the mounting hole; one end of the threaded rod (401) is threadedly connected in the threaded barrel (402); the other end of the threaded rod (401) passes through the base (1) and is rotatably connected to the base (1).

4. The seat back support structure according to claim 3, characterized in that: One end of the threaded rod (401) passes through the base (1) and is fixedly connected to a knob (10).

5. The seat back support structure according to claim 1, wherein: The adjustment assembly (7) comprises a housing (701), a rack (702), a gear (703) and a drive unit, wherein the housing (701) is fixedly connected to the lumbar support fixing frame (6), the rack (702) is vertically fixedly connected to the outer wall of the first support column (2), the inner wall of the housing (701) is rotatably connected to a rotating shaft (704), the gear (703) is fixedly connected to the rotating shaft (704), and the gear (703) is meshed with the rack (702); the drive unit is transmission-connected to the gear (703) and is used to drive the gear (703) to rotate.

6. The seat back support structure according to claim 5, characterized in that: The driving unit comprises a worm (705) and a worm wheel (706), wherein the worm (705) is rotatably connected to the inner wall of the housing (701), and the worm wheel (706) is fixedly connected to the rotating shaft (704), and the worm (705) and the worm wheel (706) are meshed and transmitted.

7. The seat back support structure according to claim 6, characterized in that: One end of the worm (705) passes through the housing (701) and is fixedly connected to a rocker (707).

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