Seat chassis capable of adjusting backward leaning force

Abstract

The utility model relates to a seat chassis capable of adjusting backward leaning force, which comprises a shell, a backrest, a backrest and a backrest, the mounting frame is U-shaped and is fixedly mounted in the shell; the elastic plate is horizontally arranged in the mounting frame, and the outer side of the elastic plate is fixedly connected with the mounting frame; the pressing block is fixed to the lower end face of the bottom plate and close to the backrest, and the pressing block presses the upper end of the inner side of the elastic plate to transmit the pressure of the cushion to the elastic plate; and the knob adjusting mechanism at least comprises a supporting rod supported on the lower end face of the elastic plate, and the supporting rod can move back and forth relative to the pressing block under the action of external force, so that the elastic distance of the elastic plate between the pressing block and the supporting rod is adjusted, and then the adjustment of the backward leaning force is realized. According to the scheme, the position of the supporting rod is adjusted, so that the elastic deformation distance of the elastic plate between the cushion pressing fulcrum and the supporting rod is changed, the backward leaning force is changed, the structure is simple, operation is convenient, and the personalized force requirements of different users are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chair technical field especially relates to a seat chassis of back leaning strength can be adjusted. BACKGROUND

[0002] The seat chassis is the core part of the seat structure, mainly used for supporting the main body of the seat and connecting various functional components, such as adjustment mechanism, wheels and seat supports, etc., the design and material selection of the seat chassis play a crucial role in the stability, durability and functionality of the seat, in modern seat design, the chassis is usually made of metal (such as steel or aluminum), plastic or composite material to ensure sufficient strength and lightness, the design of the seat chassis also considers ergonomics to provide sufficient support and comfort, in addition, many seat chassis are equipped with adjustable mechanisms, such as height adjustment, inclination and rotation functions, to meet the needs of different users, in the fields of office, medical, automotive and aviation, the design and technology of the seat chassis are different to adapt to various specific application environments and use requirements.

[0003] In traditional seats, the back leaning strength is often fixed and cannot be adjusted according to the weight of the person sitting on it, which may result in large differences in user experience for different weights. SUMMARY

[0004] In order to solve the above problems, the purpose of the utility model is to provide a seat chassis capable of adjusting the back leaning strength, which can drive the mechanical transmission mechanism through the knob, accurately and stably adjust the deformation distance of the elastic plate, and conveniently control the back leaning resistance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A seat chassis capable of adjusting the back leaning strength, characterized by comprising:

[0007] The shell is fixedly connected with the bottom plate of the cushion, and the cushion is linked with the backrest;

[0008] The mounting frame is U-shaped and fixedly installed in the shell;

[0009] The elastic plate is horizontally arranged in the mounting frame, and its outer side is fixedly connected with the mounting frame;

[0010] The pressing block is fixed on the lower end surface of the bottom plate and close to the backrest, and the pressing block presses the inner side upper end of the elastic plate to transmit the cushion pressure to the elastic plate;

[0011] The knob adjusting mechanism comprises a supporting rod supported on the lower end surface of the elastic plate and capable of moving forward and backward relative to the compression block under external force, so as to adjust the elastic distance of the elastic plate between the compression block and the supporting rod, and further adjust the reclining force.

[0012] Preferably, the knob adjusting mechanism further comprises a knob, a screw rod, a moving block and a supporting seat, the knob is arranged outside the shell, the screw rod is connected to the knob and extends into the mounting frame, the moving block is threadedly connected to the screw rod, the upper end of the moving block is formed with a clamping groove, the supporting rod is arranged on the clamping groove, and the upper end of the supporting rod is higher than the upper end of the moving block; the supporting seat is formed in the mounting frame, a first notch is formed in the middle of the supporting seat, a reduced diameter section is formed on the screw rod and can be clamped into the first notch and rotate relative to the first notch, and connecting columns for supporting the elastic plate and fixedly connected to the elastic plate are arranged on the supporting seat on both sides of the first notch; the knob can rotate under external force to drive the screw rod to rotate and drive the moving block and the supporting rod to move forward and backward relative to the compression block.

[0013] Preferably, mounting holes are formed on both sides of the mounting frame, sliding pads are embedded on the mounting holes, sliding holes are formed on the sliding pads, and the supporting rod extends out of the sliding holes on both sides and is arranged in the sliding holes.

[0014] Preferably, connecting sleeves are sleeved on both sides of the supporting rod and arranged in the sliding holes, and annular flanges are formed on the outer ends of the connecting sleeves and abut against the outer sides of the sliding pads.

[0015] Preferably, a fixing sleeve is arranged on the screw rod between the moving block and the supporting seat.

[0016] Preferably, a supporting block is formed in the mounting frame, a second notch is formed in the middle of the supporting block, and the end of the screw rod is arranged on the second notch.

[0017] Preferably, a blocking shaft is arranged on the mounting frame, the blocking shaft is parallel to the supporting rod and located above the elastic plate, fixing blocks are fixedly sleeved on both sides of the blocking shaft between the elastic plate and the inner wall of the mounting frame, two assembly holes are formed in the bottom plate, and the upper parts of the fixing blocks are adapted to be clamped into the assembly holes.

[0018] Preferably, the shell comprises two pairs of connecting supports and an outer shell fixedly welded with the two pairs of connecting supports on the front and rear sides, a plurality of first fixing holes are arranged on the connecting supports and the bottom plate, the outer shell is arranged outside the mounting frame, and a plurality of second fixing holes are arranged on the outer shell and the mounting frame.

[0019] The above technical scheme has the following beneficial effects:

[0020] The scheme adjusts the position of the supporting rod accurately by rotating the knob, changes the elastic deformation distance of the elastic plate between the seat cushion downward pressing fulcrum and the supporting rod, and changes the reclining force, which is simple in structure, convenient in operation and meets the individual force requirement of different users. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic view of a seat chassis capable of adjusting reclining force.

[0022] Figure 2 It is a three-dimensional structural schematic view of a seat chassis capable of adjusting reclining force from another perspective.

[0023] Figure 3 It is a three-dimensional structural schematic view of a bottom plate.

[0024] Figure 4 It is a mounting schematic view of an elastic plate.

[0025] Figure 5 It is a mounting schematic view of a knob adjusting mechanism.

[0026] Figure 6 It is a schematic view of the relative position of the supporting rod and the pressing block in the maximum state of adjustable reclining force.

[0027] Figure 7 It is a schematic view of the relative position of the supporting rod and the pressing block in the minimum state of adjustable reclining force. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figures 1-7 The seat chassis shown is capable of adjusting the reclining force, comprising:

[0034] The shell is fixedly connected to the base plate 1 of the seat cushion, and the seat cushion and backrest are linked together;

[0035] Mounting bracket 2 is U-shaped and is fixedly installed inside the housing;

[0036] The elastic plate 3 is horizontally set inside the mounting frame 2, and its outer side is fixedly connected to the mounting frame 2;

[0037] The pressing block 4 is fixed to the lower end surface of the base plate 1 and close to the backrest. The pressing block 4 presses the upper inner side of the elastic plate 3 to transmit the pressure of the seat cushion to the elastic plate 3.

[0038] The knob adjustment mechanism includes at least a support rod 5 supported on the lower end surface of the elastic plate 3. The support rod 5 can move back and forth relative to the pressing block 4 under the action of external force, thereby adjusting the elastic distance of the elastic plate 3 between the pressing block 4 and the support rod 5, and thus realizing the adjustment of the backward tilting force.

[0039] In the above technical solution, one end of the elastic plate supports the seat cushion and backrest, and the pressure is transmitted to the elastic plate through the clamping block, allowing the elastic plate to deform. A support rod is installed on the other side of the lower end of the elastic plate. The distance between the pressing fulcrum of the clamping block on the elastic plate and the supporting front point of the support rod directly reflects the magnitude of the reclining force. When the support rod moves closer to the clamping block under external force, the deformable elastic distance between them decreases, the deformation resistance increases, and the reclining force strengthens. When the support rod moves away from the clamping block under external force, the deformable elastic distance between them increases, the deformation resistance decreases, and the reclining force decreases. This solution has a simple structure, is easy to operate, and meets the personalized force requirements of different users.

[0040] Furthermore, the knob adjustment mechanism also includes a knob 6, a lead screw 7, a moving block 8, and a support base 9. The knob 6 is located on the outside of the housing. The lead screw 7 is connected to the knob 6 and extends into the mounting bracket 2. The moving block 8 is threadedly connected to the lead screw 7. The upper end of the moving block 8 forms a clamping groove 10 that extends to the left and right. The support rod 5 is mounted on the clamping groove 10, and the upper end of the support rod 5 is higher than the upper end of the moving block 8. The support base 9 is formed in the mounting bracket 2. A first notch 11 is formed in the middle of the support base 9. A reduced-diameter section 12 is formed on the lead screw 7 that can be inserted into and rotate relative to the first notch 11. The support base 9 has connecting posts 13 on both sides of the first notch 11 that support elastic plates 3 and are fixedly connected to them. The knob 6 can rotate under the action of external force, which drives the lead screw 7 to rotate and drives the moving block 8 and the support rod 5 to move back and forth relative to the pressing block 4.

[0041] In the above technical solution, when the knob is rotated, the lead screw drives the moving block to move back and forth, and the support rod set on the moving block moves synchronously, thereby changing the elastic distance (i.e., deformation section) of the elastic plate between the pressing block and the support rod. The cooperation between the lead screw and the moving block provides micro-range control capability, and the deformation section of the elastic plate can be continuously adjusted to meet the personalized force requirements of different users. The cooperation between the first notch and the reduced diameter section can maintain the rotational stability of the lead screw, and the setting of the connecting column provides support and fixation for the elastic plate.

[0042] Furthermore, mounting holes are formed on both sides of the mounting bracket 2, and sliding pads 15 are embedded in the mounting holes. Sliding holes 16 are formed on the sliding pads 15, and the two ends of the support rod 5 extend out of the sliding holes 16 on both sides and are mounted in the sliding holes 16. In this technical solution, the setting of sliding pads and sliding holes can reduce friction, making the movement of the support rod within the mounting bracket smoother and more stable.

[0043] Furthermore, connecting sleeves 17, which are mounted within sliding holes 16, are sleeved on both sides of the support rod 5. The outer end of the connecting sleeve 17 has an annular flange 18 that abuts against the outer side of the sliding pad 15. In this technical solution, the annular flange on the connecting sleeve serves a limiting function, maintaining the stability of the support rod.

[0044] Furthermore, a fixing sleeve 19 is provided on the lead screw 7 between the moving block 8 and the support base 9. In this technical solution, the fixing sleeve limits the movement of the moving block and maintains its stability.

[0045] Furthermore, a support block 20 is formed within the mounting bracket 2, and a second recess 21 is formed in the middle of the support block 20. The end of the lead screw 7 is mounted on the second recess 21. In this technical solution, the second recess enhances the axial support of the lead screw and prevents displacement.

[0046] Furthermore, a retaining shaft 22 is provided on the mounting bracket 2. The retaining shaft 22 is parallel to the support rod 5 and located above the elastic plate 3. Fixing blocks 23 are fixedly fitted on both sides of the retaining shaft 22 between the elastic plate 3 and the inner wall of the mounting bracket 2 via fixing sleeves 19. Two assembly holes are provided on the base plate 1, and the upper part of the fixing blocks 23 is fitted into these assembly holes. In this technical solution, the retaining shaft serves to prevent detachment, preventing the elastic plate from springing upwards during recovery, reducing unnecessary deformation, and extending service life. The fixing blocks on both sides of the retaining shaft are assembled with the base plate, further ensuring the installation stability of the retaining shaft.

[0047] Furthermore, the housing includes two connecting brackets 24, and an outer shell welded and fixed to the two connecting brackets 24 on the front and rear sides respectively. The connecting brackets 24 and the base plate 1 are respectively provided with a plurality of first fixing holes 25. The outer shell covers the outside of the mounting frame 2, and the outer shell and the mounting frame 2 are respectively provided with a plurality of second fixing holes 26. In this technical solution, the outer shell can be quickly assembled and disassembled from the base plate via the first and second fixing holes on the connecting brackets, facilitating internal mechanism maintenance or component replacement.

[0048] 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.

[0049] 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. A seat chassis capable of adjusting the reclining force, characterized in that: include: The shell is fixedly connected to the base plate (1) of the seat cushion, and the seat cushion and backrest are linked together; Mounting bracket (2) is U-shaped and is fixedly installed inside the housing; The elastic plate (3) is horizontally set inside the mounting frame (2), and its outer side is fixedly connected to the mounting frame (2); The pressing block (4) is fixed on the lower end surface of the base plate (1) and close to the backrest. The pressing block (4) presses the upper inner side of the elastic plate (3) to transmit the cushion pressure to the elastic plate (3). The knob adjustment mechanism includes at least a support rod (5) supported on the lower end surface of the elastic plate (3), and the support rod (5) can move back and forth relative to the pressing block (4) under the action of external force, thereby adjusting the elastic distance of the elastic plate (3) between the pressing block (4) and the support rod (5), and thus realizing the adjustment of the backward tilting force.

2. The seat chassis capable of adjusting the reclining force according to claim 1, characterized in that: The knob adjustment mechanism also includes a knob (6), a lead screw (7), a moving block (8), and a support base (9). The knob (6) is located on the outside of the housing. The lead screw (7) is connected to the knob (6) and extends into the mounting bracket (2). The moving block (8) is threadedly connected to the lead screw (7). The upper end of the moving block (8) forms a clamping groove (10) that extends through to the left and right. The support rod (5) is mounted on the clamping groove (10), and the upper end of the support rod (5) is higher than the upper end of the moving block (8). The support base (9) The support base (9) is formed in the mounting frame (2), and a first notch (11) is formed in the middle of the support base (9). A reduced diameter section (12) is formed on the screw (7) and can be inserted and rotated relative to the first notch (11). The support base (9) is provided with a support elastic plate (3) on both sides of the first notch (11) and a connecting column (13) is fixedly connected to it. The knob (6) can rotate under the action of external force to drive the screw (7) to rotate and drive the moving block (8) and the support rod (5) to move back and forth relative to the pressing block (4).

3. A seat chassis capable of adjusting the reclining force according to claim 2, characterized in that: The mounting bracket (2) has mounting holes on both sides, and a sliding pad (15) is embedded in the mounting hole. A sliding hole (16) is constructed on the sliding pad (15). The two ends of the support rod (5) extend out of the sliding holes (16) on both sides and are mounted in the sliding holes (16).

4. A seat chassis capable of adjusting the reclining force according to claim 3, characterized in that: The support rod (5) has connecting sleeves (17) mounted in the sliding hole (16) on both sides. The outer end of the connecting sleeve (17) has an annular flange (18) that abuts against the outside of the sliding pad (15).

5. A seat chassis capable of adjusting the reclining force according to claim 2, characterized in that: A fixed sleeve (19) is provided on the lead screw (7) between the moving block (8) and the support seat (9).

6. A seat chassis capable of adjusting the reclining force according to claim 2, characterized in that: The mounting bracket (2) has a support block (20) formed inside, and a second notch (21) is formed in the middle of the support block (20). The end of the lead screw (7) is mounted on the second notch (21).

7. A seat chassis capable of adjusting the reclining force according to claim 1, characterized in that: The mounting bracket (2) is provided with a stop shaft (22), which is parallel to the support rod (5) and located above the elastic plate (3). The two sides of the stop shaft (22) are fixed with fixing blocks (23) in the fixing sleeve (19) between the elastic plate (3) and the inner wall of the mounting bracket (2). The bottom plate (1) has two assembly holes, and the upper part of the fixing block (23) is adapted to be inserted into the assembly hole.

8. A seat chassis capable of adjusting the reclining force according to claim 2, characterized in that: The housing includes two sets of connecting brackets (24) and an outer shell that is welded and fixed to the two sets of connecting brackets (24) on the front and back sides respectively. The connecting brackets (24) and the base plate (1) are provided with a plurality of first fixing holes (25). The outer shell is covered on the outside of the mounting frame (2). The outer shell and the mounting frame (2) are provided with a plurality of second fixing holes (26).

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