A seat back assembly

Abstract

The utility model discloses a seat backrest subassembly, including seat support, waist support frame, the cross section of seat support is L shape, the bottom of seat support is used for with seat chassis is connected, including the plug -in block, the front side of seat support is fixed with the support seat, the front side of support seat is equipped with the insertion hole, the rear end of plug -in block inserts insertion hole, the bottom of support seat is equipped with adjustable locating plate, the front end of adjustable locating plate is equipped with the locating rod that protrudes upwards, the front end of plug -in block is used for with waist support frame fixedly cooperate, the bottom of plug -in block is equipped with the recess, be provided with the protruding portion in the recess, the protruding portion is equipped with a plurality of interval arrangement's locating slot along the front -back direction, the locating rod of adjustable locating plate inserts one of locating slot and is limited to plug -in block, and the overall structure is compact and reliable, satisfies the demand to lumbar support position, the strength, improves seat breathability, comfort and service life.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically a seat back assembly. Background Technology

[0002] With the increasing demand for comfort, support, and personalization in modern office and home life, in order to balance breathability and elastic support, the entire mesh fabric is generally stretched and fixed directly to the backrest frame. Traditional one-piece backrests, due to their fixed and non-adjustable support structure, can no longer meet the different lumbar support requirements of users of different body types.

[0003] Meanwhile, existing adjustable lumbar support structures mostly rely on complex lead screw or gear mechanisms, which involve a large number of parts, complicated assembly processes, high costs, and are prone to failure. The market urgently needs a seat back assembly that is simple in structure, reliable in positioning, adjustable in support position, and easy to modularly assemble. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model relates to a seat back assembly. This assembly has a simple and reliable structure, effectively solves the aforementioned technical problems, and is suitable for widespread use. To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A seat back assembly includes a seat bracket and a lumbar support frame. The seat bracket has an L-shaped cross-section and its bottom is used to connect to a seat chassis. It also includes a plug-in block. A support seat is fixed to the front side of the seat bracket, and a plug hole is provided on the front side of the support seat. The rear end of the plug-in block is inserted into the plug hole. An adjustable positioning plate is provided at the bottom of the support seat, and a positioning rod protruding upwards is provided at the front end of the adjustable positioning plate. The front end of the plug-in block is used to fix and cooperate with the lumbar support frame. A groove is provided at the bottom of the plug-in block, and a protrusion is provided in the groove. The protrusion has several positioning slots spaced apart along the front-rear direction. The positioning rod of the adjustable positioning plate is inserted into one of the positioning slots to limit the position of the plug-in block.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the left and right sides of the plug block are respectively provided with slide bars, and a plurality of slide bars are evenly spaced along the vertical direction, and the inner wall of the plug hole of the support base is provided with a sliding groove that slides and engages with the slide bars.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the bottom of the support base is provided with a support shaft and an arc-shaped groove, the arc-shaped groove is arranged around the axis of the support shaft, the through hole of the adjustable positioning plate is sleeved on the support shaft, the positioning rod of the adjustable positioning plate passes upward through the arc-shaped groove, and an elastic clamping plate is also provided above the adjustable positioning plate, the elastic clamping plate is wrapped around the outside of the support shaft and clamps the adjustable positioning plate at both ends.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the adjustable positioning plate is set in the triangular mounting groove at the bottom of the support base, and the triangular mounting groove is also provided with two left and right symmetrical studs. The inner hole of the support shaft is also a threaded hole. A pressure plate is also provided below the adjustable positioning plate. The pressure plate is provided with bolt mounting holes corresponding to the support shaft and the two studs. The pressure plate is fixed in the triangular mounting groove by bolt connection and is used to press the adjustable positioning plate from below.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the middle part of the waist support frame is provided with a rearward T-shaped block, and the front side of the plug block is provided with a limiting groove that matches the T-shaped block.

[0010] Based on the above solution and as a preferred embodiment of the above solution, it further includes a back support frame, which is disposed on the top of the seat bracket.

[0011] The outstanding and beneficial technical effects of this invention compared to the prior art are as follows: This invention achieves an adjustable design for the lumbar support of the mesh backrest by modularly combining the L-shaped seat bracket, plug-in block, adjustable positioning plate, and lumbar support frame. The plug-in block is inserted into the support seat using a guide, and the positioning rod and multi-positioning groove provide stable locking. The elastic clamp and pressure plate ensure zero rebound and zero loosening after adjustment. The triangular mounting groove and bolt pressure plate structure make the adjustable positioning plate evenly stressed and easy to assemble, significantly reducing the number of parts and processes. The cooperation between the T-shaped block and the limiting groove allows the lumbar support frame and plug-in block to be replaced as a whole, which is convenient for the mesh fabric to be tensioned in sections and for later maintenance. The overall structure is compact and reliable, meeting the personalized needs of users of different body types for the position and strength of lumbar support, and improving the breathability, comfort and service life of the seat. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the seat assembly;

[0013] Figure 2 This is a schematic diagram of the lumbar support frame;

[0014] Figure 3 This is a schematic diagram of the pressure plate structure;

[0015] Figure 4 This is a cross-sectional view of the seat assembly.

[0016] Figure 5 This is a schematic diagram of the bottom of the support base;

[0017] Figure 6 This is a schematic diagram of the plug-in block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.

[0019] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The directions or positional relationships shown are for the purpose of describing this utility model only, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this application, the terms "first," "second," etc., 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.

[0021] like Figure 1-6 As shown, this utility model designs a seat back assembly, including a seat bracket 1, a lumbar support frame 2, and a plug-in block 3. The seat bracket 1 has an L-shaped cross-section. The bottom of the seat bracket 1 is used to connect with the seat chassis (not shown in the figure). A support seat 4 is fixedly provided on the front side of the seat bracket 1. The front side of the support seat 4 is provided with a plug hole. The rear end of the plug-in block 3 is inserted into the plug hole and can slide back and forth in it without causing up-down or left-right wobbling. The bottom of the support seat 4 is provided with an adjustable positioning plate 5. The front end of the adjustable positioning plate 5 is provided with an upwardly protruding positioning rod 6. The front end of the plug-in block 3 is used to fix and cooperate with the lumbar support frame 2. The outer perimeter of the lumbar support frame 2 is covered and tensioned with a breathable mesh structure to form an independent lumbar mesh support area.

[0022] The bottom of the plug-in block 3 is provided with a groove, and a protrusion 7 is provided in the groove. The protrusion 7 is provided with a plurality of positioning grooves 8 spaced apart in the front-back direction. After the positioning rod 6 of the adjustable positioning plate 5 is inserted into one of the positioning grooves 8, it limits the plug-in block 3. The positioning rod 6 and the multiple positioning grooves 8 cooperate to achieve adjustable and stable locking, so as to meet the personalized needs of different body types and sitting postures for support depth and elasticity.

[0023] In this embodiment, it is further preferred that the left and right sides of the plug block 3 are respectively provided with slide bars 9, and a plurality of slide bars 9 are evenly spaced along the vertical direction. The inner wall of the plug hole of the support base 4 is provided with a sliding groove 10 that slides and engages with the slide bars 9. The slide bars 9 and the sliding groove 10 engage at multiple points along the vertical direction, which strictly constrains the motion freedom of the plug block 3 to linear sliding in the front and back direction, realizing precise guiding sliding with low friction and high rigidity, and ensuring that the adjustment process is stable and without shaking.

[0024] In this embodiment, it is further preferred that the bottom of the support base 4 is provided with a support shaft 11 and an arc groove 12. The arc groove 12 is arranged around the axis of the support shaft 11. The through hole of the adjustable positioning plate 5 is sleeved on the support shaft 11. The positioning rod 6 of the adjustable positioning plate 5 passes upward through the arc groove 12. An elastic clamping plate 13 is also provided above the adjustable positioning plate 5. The elastic clamping plate 13 is wrapped around the outside of the support shaft 11 and clamps the adjustable positioning plate 5 at both ends. After the adjustable positioning plate 5 is moved, the plate swings slightly in a circular arc in the horizontal plane with the support shaft 11 as the rotation center, which drives the positioning rod 6 to slide synchronously along the arc groove 12 and separate from the positioning groove. Since the central angle of the arc groove 12 limits the swing range, the displacement trajectory of the positioning rod 6 is determined and there is no deviation, realizing precise and segmented adjustment and positioning in the front and back directions. At the same time, the elastic clamping plate 13 continuously provides rotational damping to eliminate shaking and ensure stable locking of the position after adjustment.

[0025] In this embodiment, it is further preferred that the adjustable positioning plate 5 is disposed in the triangular mounting groove at the bottom of the support base. The triangular mounting groove is also provided with two symmetrical studs 14. The inner hole of the support shaft 11 is also a threaded hole. A pressure plate 15 is also provided below the adjustable positioning plate 5. The pressure plate 15 is provided with bolt mounting holes corresponding to the support shaft 11 and the two studs 14. The pressure plate 15 is fixed in the triangular mounting groove by bolt connection and is used to press the adjustable positioning plate 5 from below. The triangular mounting groove provides a three-sided positioning reference for the adjustable positioning plate 5. It forms a three-point fastening with the symmetrical studs 14 and the central threaded hole. The pressure plate 15 completely constrains the adjustable positioning plate 5 in the groove from bottom to top. After the bolts are locked, the adjustable positioning plate 5 obtains a uniform and stable clamping force in the horizontal direction, which not only eliminates the adjustment gap, but also ensures that there is no loosening or warping after long-term swinging, thereby ensuring the repeatability and durability of the positioning rod 6 in the arc groove 12. The entire disassembly and assembly method is also relatively convenient.

[0026] In this embodiment, it is further preferred that the waist support frame 2 has a rearward-facing T-shaped block 16 in the middle, and the front side of the plug block 3 has a limiting groove 17 that matches the T-shaped block 16, forming a mortise and tenon fit. During assembly, it can be accurately positioned by inserting from top to bottom, and can be separated by pulling it upwards during disassembly, which greatly shortens the assembly time on the production line and provides convenience for subsequent mesh cleaning or component upgrades.

[0027] In this embodiment, it is further preferred to include a back support frame 18, which is set on the top of the seat bracket 1 and forms a double-frame structure with the lower lumbar support frame 2. The upper back area maintains the overall mesh tension to support the shoulders and back, while the lower back area is independently controlled by the adjustable lumbar module. The two do not interfere with each other. This partition design not only improves the uniformity of force on the entire mesh fabric, but also makes the lumbar adjustment stroke no longer limited by the back frame, achieving a wider range and more refined personalized support.

[0028] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made by those skilled in the art based on the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A seat back assembly, comprising a seat bracket and a lumbar support frame, wherein the seat bracket has an L-shaped cross-section, and the bottom of the seat bracket is used for connection to a seat chassis, characterized in that: It also includes a plug-in block. A support base is fixedly provided on the front side of the seat bracket. A plug hole is provided on the front side of the support base. The rear end of the plug-in block is inserted into the plug hole. An adjustable positioning plate is provided at the bottom of the support base. A positioning rod protruding upward is provided at the front end of the adjustable positioning plate. The front end of the plug-in block is used to fix and cooperate with the lumbar support frame. A groove is provided at the bottom of the plug-in block. A protrusion is provided in the groove. The protrusion is provided with a plurality of positioning slots spaced apart in the front-back direction. The positioning rod of the adjustable positioning plate is inserted into one of the positioning slots to limit the position of the plug-in block.

2. A seat back assembly according to claim 1, characterized in that: The plug block is provided with slide bars on its left and right sides respectively, and a plurality of slide bars are evenly spaced in the vertical direction. The inner wall of the plug hole of the support base is provided with a sliding groove that slides and engages with the slide bars.

3. A seat back assembly according to claim 2, characterized in that: The bottom of the support base is provided with a support shaft and an arc-shaped groove. The arc-shaped groove is arranged around the axis of the support shaft. The through hole of the adjustable positioning plate is sleeved on the support shaft. The positioning rod of the adjustable positioning plate passes upward through the arc-shaped groove. An elastic clamping plate is also provided above the adjustable positioning plate. The elastic clamping plate is wrapped around the outside of the support shaft and clamps the adjustable positioning plate at both ends.

4. A seat back assembly according to claim 3, characterized in that: The adjustable positioning plate is set in the triangular mounting groove at the bottom of the support base. The triangular mounting groove is also provided with two left and right symmetrical studs. The inner hole of the support shaft is also a threaded hole. A pressure plate is also provided below the adjustable positioning plate. The pressure plate is provided with bolt mounting holes corresponding to the support shaft and the two studs. The pressure plate is fixed in the triangular mounting groove by bolt connection and is used to press the adjustable positioning plate from below.

5. A seat back assembly according to claim 4, characterized in that: The waist support frame has a rearward-facing T-shaped block in the middle, and the front side of the plug block has a limiting groove that matches the T-shaped block.

6. A seat back assembly according to claim 5, characterized in that: It also includes a back support frame, which is positioned on top of the seat bracket.

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