Waist rest adjusting mechanism and chair

Abstract

The utility model discloses a waist rest adjusting mechanism and a chair. The waist rest adjusting mechanism comprises a mounting bracket, a waist rest, a handle, a two-way screw rod, a first driving rod, a second driving rod and a motor, the waist rest is mounted on the mounting bracket in a manner of moving back and forth; the bidirectional screw is rotatably mounted on the mounting support and comprises a first threaded portion and a second threaded portion which are opposite in thread, one end of the first driving rod is connected with the first threaded portion, the other end of the first driving rod is hinged to the waist rest, one end of the second driving rod is connected with the second threaded portion, and the other end of the second driving rod is hinged to the waist rest. The motor and the handle are mounted on the mounting bracket and are in transmission connection with the two-way screw rod; and one end of the handle extends out of the mounting bracket. In this way, two modes of motor automatic control and handle manual control can be provided, richer applicable experience can be provided for a user, and the position of the waist rest can be adjusted in time in a power-off scene.

Description

Technical Field

[0001] This utility model relates to the field of home furnishings, and in particular to a lumbar support adjustment mechanism and a chair. Background Technology

[0002] The lumbar support of the chair is mainly designed to conform to the human waist, providing more comfortable support for the lower back, especially for office workers, and effectively relieving lower back fatigue and tiredness caused by prolonged sitting.

[0003] Prior art, disclosed in announcement number CN221865238U, provides an adjustable lumbar support structure for a seat. This structure includes a rear sleeve with one end fixed to a bracket, and a front sleeve fitted onto the other end of the rear sleeve. The end of the front sleeve furthest from the rear sleeve is connected to the lumbar support via a connecting seat. An electrically operated telescopic push rod is installed inside the front sleeve, capable of pushing the front sleeve to move back and forth relative to the rear sleeve. One end of the electric telescopic push rod is fixed inside the rear sleeve at the backrest end, and the other end is fixed inside the front sleeve at the lumbar support end. Because the other end of the rear sleeve is fitted onto the front sleeve, the electric telescopic push rod pushes the front sleeve, and the end of the front sleeve and the lumbar support act as a single unit, causing the lumbar support to move with the front sleeve, resulting in smoother lumbar support movement.

[0004] In existing technology, the lumbar support is controlled to move back and forth by an electric telescopic push rod. This causes all the pressure and thrust received by the lumbar support to be applied to the threads of the electric push rod, resulting in long-term stress on the threads, which leads to large wear and tear on the thread friction distance. This makes the electric push rod prone to failure, reducing the stability of the chair. Furthermore, when the electric telescopic push rod fails, the adjustment function of the lumbar support will be unusable. Utility Model Content

[0005] To address the problem of low structural stability and lack of remedial solutions in existing lumbar support systems, this invention aims to provide a lumbar support adjustment mechanism and chair. This solution offers higher stability and reliability, and features both manual and electronic control options, thereby expanding the chair's applicability to various scenarios.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a lumbar support adjustment mechanism, comprising a mounting bracket, a lumbar support, a handle, a bidirectional screw, a first drive rod, a second drive rod, and a motor; the lumbar support is mounted on the mounting bracket in a manner that allows it to move back and forth; the bidirectional screw is rotatably mounted on the mounting bracket, and the bidirectional screw includes a first threaded portion and a second threaded portion with opposite threads; one end of the first drive rod is connected to the first threaded portion, and the other end of the first drive rod is hinged to the lumbar support; one end of the second drive rod is connected to the second threaded portion, and the other end of the second drive rod is hinged to the lumbar support; both the motor and the handle are mounted on the mounting bracket, and both the motor and the handle are connected to the bidirectional screw for transmission; one end of the handle extends out from inside the mounting bracket; both the motor and the handle can drive the first drive rod and the second drive rod to move closer or further apart through the bidirectional screw, thereby moving the lumbar support back and forth.

[0007] Preferably, the first drive rod and the second drive rod are arranged in an alternating manner.

[0008] Preferably, the rear end of the first drive rod is provided with a third notch, the first nut is located in the third notch, the first nut is hinged to the first drive rod, and the first nut is sleeved on the first threaded part of the bidirectional screw; the rear end of the second drive rod is provided with a fourth notch, the second nut is located in the fourth notch, the second nut is hinged to the second drive rod, and the second nut is sleeved on the second threaded part of the bidirectional screw.

[0009] Preferably, one end of the bidirectional screw is provided with a linkage shaft, the handle is connected to the linkage shaft, a first gear is provided on the linkage shaft, and a second gear is installed on the output shaft of the motor, and the first gear and the second gear mesh and drive each other.

[0010] Preferably, the backrest is mounted on the mounting bracket via a second elastic element, with the backrest positioned above the lumbar support.

[0011] Preferably, the mounting bracket includes a back plate and a mounting base. The mounting base is fixed to the front end of the back plate and has a first receiving cavity that extends through the mounting base in the front-to-back direction. A connecting seat is installed at the rear end of the lumbar support and is inserted into the first receiving cavity and slidably engaged. A first drive rod and a second drive rod are hinged to the connecting seat, and the drive assembly drives the lumbar support to move by driving the connecting seat.

[0012] Preferably, the connecting seat and the lumbar support are connected by a first elastic element.

[0013] Preferably, the bottom of the first accommodating cavity has a protruding guide portion, and the bottom of the connecting seat is provided with a guide groove, with the guide portion inserted into the guide groove and slidingly engaged.

[0014] Preferably, the rear end of the connector is provided with a third receiving cavity, into which the front ends of the first drive rod and the second drive rod extend; the top of the connector is provided with a hinge hole, through which two hinge shafts are respectively connected to the front ends of the first drive rod and the second drive rod.

[0015] A chair including the aforementioned lumbar support adjustment mechanism.

[0016] The beneficial effects of this utility model's technical solution are as follows: the forward directions of the bidirectional screw and the lumbar support are different, thus allowing the force on the lumbar support to be directly transmitted to the body of the bidirectional screw through the drive rod, rather than acting directly on the threads of the bidirectional screw, thereby increasing the stability and service life of the chair; furthermore, the lumbar support is driven to move through both ends of the first and second drive rods, making the movement of the lumbar support more stable, and the force on the lumbar support can be distributed through the two drive rods, thereby reducing the single-point force on the bidirectional screw and improving the reliability of the chair; the above solution provides two modes: automatic motor control and manual handle control, thus providing users with a richer application experience, and allowing lumbar support position adjustment even in the event of a power outage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the lumbar support adjustment mechanism;

[0018] Figure 2 A schematic diagram of the lumbar support adjustment mechanism to remove the backrest. Figure 1 ;

[0019] Figure 3 A schematic diagram of the lumbar support adjustment mechanism to remove the backrest. Figure 2 ;

[0020] Figure 4 A schematic diagram of the lumbar support adjustment mechanism after removing the back frame, back panel, and mounting base;

[0021] Figure 5 A schematic diagram of the lumbar support adjustment mechanism is shown after removing the backrest, lumbar support, and backrest.

[0022] Figure 6 A schematic diagram of the connection structure of the motor, handle, bidirectional screw, first drive rod and second drive rod;

[0023] Figure 7 This is a structural diagram of a lumbar support.

[0024] Figure 8 This is a schematic diagram of the connection structure between the back plate and the first mounting base.

[0025] Attached reference numerals: 1. Back frame;

[0026] 2. Mounting bracket; 21. External accessories; 22. Back plate; 221. First positioning groove; 222. Third positioning groove; 223. Third clearance groove; 224. Bearing groove; 225. Fourth clearance groove; 23. Mounting base;

[0027] 3. Lumbar support; 31. Covering component; 32. Connecting seat; 33. Third receiving cavity; 34. Second clearance groove; 35. Guide groove; 36. Hinge hole; 37. Spring;

[0028] 4. Backrest; 41. Second elastic element;

[0029] 71. Handle; 72. First bearing seat; 73. Second bearing seat; 74. Double-acting screw; 741. First gear; 742. Linkage shaft; 75. First nut; 76. Second nut; 77. First drive rod; 78. Second drive rod; 79. Motor; 791. Second gear. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] 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.

[0033] 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.

[0034] 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. Example

[0035] like Figures 1 to 8 The lumbar support adjustment mechanism shown includes a mounting bracket 2, a lumbar support 3, a handle 71, a double-acting screw 74, a first drive rod 77, a second drive rod 78, and a motor 79; the lumbar support 3 is mounted on the mounting bracket 2 in a way that allows it to move back and forth.

[0036] The bidirectional screw 74 is rotatably mounted on the mounting bracket 2. The bidirectional screw 74 includes a first threaded portion and a second threaded portion with opposite threads. One end of the first drive rod 77 is connected to the first threaded portion, and the other end of the first drive rod 77 is hinged to the waist rest 3. One end of the second drive rod 78 is connected to the second threaded portion, and the other end of the second drive rod 78 is hinged to the waist rest 3. The motor 79 and the handle 71 are both mounted on the mounting bracket 2, and the motor 79 and the handle 71 are both connected to the bidirectional screw 74 for transmission. One end of the handle 71 extends out from inside the mounting bracket 2.

[0037] Both the motor 79 and the handle 71 can drive the first drive rod 77 and the second drive rod 78 to move closer or further apart through the bidirectional screw 74, so that the waist rest 3 can move back and forth.

[0038] With this configuration, the forward directions of the bidirectional screw and the lumbar support are different, allowing the force on the lumbar support to be directly transmitted to the body of the bidirectional screw through the drive rod, rather than acting directly on the threads of the bidirectional screw. This results in greater stability and a longer service life for the chair. Furthermore, the lumbar support is moved by the first and second drive rods, making its movement more stable. The force on the lumbar support can be distributed through the two drive rods, reducing the single-point stress on the bidirectional screw and improving the reliability of the chair.

[0039] The above solution offers two modes: automatic motor control and manual handle control, thus providing users with a richer and more applicable experience.

[0040] In this embodiment, as Figure 3 , Figure 5 and Figure 8 As shown, the mounting bracket 2 includes a back plate 22 and a mounting base 23. The mounting base 23 is fixed to the front end of the back plate 22, and a first receiving cavity 231 is provided on the mounting base 23, which extends through the mounting base 23 in the front-to-back direction; Figure 3 , Figure 5 ,and Figure 7 As shown, a connecting seat 32 is installed at the rear end of the lumbar support 3. The connecting seat 32 is inserted into the first accommodating cavity 231 and slides in fit. The first drive rod 77 and the second drive rod 78 are hinged to the connecting seat 32. The drive assembly drives the lumbar support 3 to move by driving the connecting seat 32.

[0041] Further preferred, such as Figure 8 As shown, the bottom of the first accommodating cavity 231 has a protruding guide portion 232, and the bottom of the connecting seat 32 is provided with a guide groove 35. The guide portion 232 is inserted into the guide groove 35 and slides in fit.

[0042] In this embodiment, as Figures 3 to 8 As shown, a third receiving cavity 33 is provided at the rear end of the connecting seat 32, and the front ends of the first driving rod 77 and the second driving rod 78 extend into the third receiving cavity 33. A hinge hole 36 is provided at the top of the connecting seat 32, and two hinge shafts are respectively connected to the front ends of the first driving rod 77 and the second driving rod 78 through the two hinge holes.

[0043] In this embodiment, as Figures 4 to 8As shown, it also includes a first bearing seat 72 and a second bearing seat 73. Both the first bearing seat and the second bearing seat 73 are fixed on the back plate 22. The two ends of the bidirectional screw 74 are rotatably connected to the first bearing seat 72 and the second bearing seat 73 through bearings. The front end of the back plate 22 is provided with a first positioning groove 221 and a second positioning groove, and the first bearing seat 72 and the second bearing seat 73 are respectively installed in the first positioning groove 221 and the second positioning groove. The rear end of the mounting base 23 is provided with a first clearance groove, which is connected to the first receiving cavity 231, and the first bearing seat 72 is inserted into the first clearance groove.

[0044] In this embodiment, as Figure 3 and Figure 7 As shown, the rear end of the connecting seat 32 is provided with two second clearance grooves 34. The two second clearance grooves 34 are respectively located on both sides of the third receiving cavity 33 of the connecting seat 32, and the second clearance grooves 34 are connected to the third receiving cavity 33. When the connecting seat 32 moves to the end of its stroke, the first drive rod 77 and the second drive rod 78 are respectively inserted into the two second clearance grooves 34 to make way between the connecting seat and the drive rod.

[0045] In this embodiment, as Figure 3 , Figure 5 and Figure 6 As shown, one end of the bidirectional screw 74 is equipped with a linkage shaft 742. The handle 71 is connected to the linkage shaft 742. A first gear 741 is mounted on the linkage shaft 742, and a second gear 791 is mounted on the output shaft of the motor 79. The first gear 741 and the second gear 791 mesh and transmit power. Wherein, as... Figure 8 As shown, the front end of the back plate 22 is provided with a third positioning groove 222, and a motor 79 bracket is installed at the third positioning groove 222, with the motor 79 mounted on the motor 79 bracket; the front end of the back plate 22 is provided with a third clearance groove 223 and a fourth clearance groove 225, with part of the first gear 741 inserted into the third clearance groove 223 and part of the second gear 791 inserted into the fourth clearance groove 225; a bearing is also installed on the linkage shaft 742, and the front end of the back plate 22 is provided with a bearing groove 224, with part of the bearing embedded in the bearing groove 224. This allows the lumbar support adjustment structure to be thinned as quickly as possible while ensuring the stable operation of each component.

[0046] In this embodiment, as Figures 3 to 6 As shown, the first drive rod 77 and the second drive rod 78 are arranged intersectingly. The first drive rod 77 has a first notch at its top, and the second drive rod 78 has a second notch at its bottom. The first notch and the second notch are interlocked, thus making the first drive mechanism thinner.

[0047] In a further preferred embodiment, the rear end of the first drive rod 77 is provided with a third notch, the first nut 75 is located in the third notch, the first nut 75 is hinged to the first drive rod 77, and the first nut 75 is sleeved on the first threaded portion of the bidirectional screw 74; the rear end of the second drive rod 78 is provided with a fourth notch, the second nut 76 is located in the fourth notch, the second nut 76 is hinged to the second drive rod 78, and the second nut 76 is sleeved on the second threaded portion of the bidirectional screw 74.

[0048] In this embodiment, the front end of the connecting seat 32 and the lumbar support 3 are connected by a first elastic element; thus, the elastic element provides elastic support to the lumbar support 3. The first elastic element includes a spring 37. A first spring 37 seat is fixed to the front end of the connecting seat 32, and a second spring 37 seat is fixed to the rear end of the lumbar support 3. The two ends of the spring 37 are connected to the first spring 37 seat and the second spring 37 seat, respectively. The elastic element also includes a covering 31, which covers the first spring 37 seat, the spring 37, and the second spring 37 seat.

[0049] In this embodiment, as Figures 1 to 4 As shown, it also includes a backrest 4, which is mounted on the top of the back panel 22 via a second elastic member 41; wherein the second elastic member includes soft rubber.

[0050] In this embodiment, as Figures 1 to 4 As shown, it also includes an external accessory 21, which is fixed to the back plate 22 and covers the mounting base 23 and the second mounting base 23.

[0051] A chair includes the aforementioned lumbar support adjustment mechanism 3, and also includes a backrest frame 1, a seat, and support legs. The back panel 22 is fixed to the front end of the backrest frame 1, the seat is fixed to the bottom of the backrest frame 1, and the support legs are installed at the bottom of the seat.

[0052] 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.

[0053] 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 lumbar support adjustment mechanism, characterized in that: Includes a mounting bracket (2), a lumbar support (3), a handle (71), a two-way screw (74), a first drive rod (77), a second drive rod (78), and a motor (79); the lumbar support (3) is mounted on the mounting bracket (2) in a way that allows it to move back and forth. A bidirectional screw (74) is rotatably mounted on a mounting bracket (2). The bidirectional screw (74) includes a first threaded portion and a second threaded portion with opposite threads. One end of a first drive rod (77) is connected to the first threaded portion, and the other end of the first drive rod (77) is hinged to a backrest (3). One end of a second drive rod (78) is connected to the second threaded portion, and the other end of the second drive rod (78) is hinged to a backrest (3). A motor (79) and a handle (71) are both mounted on the mounting bracket (2). Both the motor (79) and the handle (71) are connected to the bidirectional screw (74) via transmission. One end of the handle (71) extends out from inside the mounting bracket (2). Both the motor (79) and the handle (71) can drive the first drive rod (77) and the second drive rod (78) to move closer or further apart through the bidirectional screw (74), so that the waist rest (3) moves back and forth.

2. The lumbar support adjustment mechanism according to claim 1, characterized in that: The first drive rod (77) and the second drive rod (78) are arranged in an intersecting manner.

3. The lumbar support adjustment mechanism according to claim 1, characterized in that: The rear end of the first drive rod (77) is provided with a third notch, and the first nut (75) is located in the third notch. The first nut (75) is hinged to the first drive rod (77) and is sleeved on the first threaded part of the bidirectional screw (74). The rear end of the second drive rod (78) is provided with a fourth notch, and the second nut (76) is located in the fourth notch. The second nut (76) is hinged to the second drive rod (78) and is sleeved on the second threaded part of the bidirectional screw (74).

4. The lumbar support adjustment mechanism according to claim 1, characterized in that: One end of the bidirectional screw (74) is provided with a linkage shaft (742), the handle (71) is connected to the linkage shaft (742), the linkage shaft (742) is provided with a first gear (741), and the output shaft of the motor (79) is equipped with a second gear (791). The first gear (741) and the second gear (791) mesh and drive each other.

5. The lumbar support adjustment mechanism according to claim 1, characterized in that: The backrest (4) is mounted on the mounting bracket (2) via the second elastic element (41), and the backrest (4) is located above the lumbar support (3).

6. The lumbar support adjustment mechanism according to claim 1, characterized in that: The mounting bracket (2) includes a back plate (22) and a mounting base (23). The mounting base (23) is fixed to the front end of the back plate (22). The mounting base (23) is provided with a first receiving cavity (231), which extends through the mounting base (23) in the front-back direction. The rear end of the lumbar support (3) is equipped with a connecting seat (32), which is inserted into the first accommodating cavity (231) and slidably engaged; the first drive rod (77) and the second drive rod (78) are hinged to the connecting seat (32), and the drive assembly drives the lumbar support (3) to move by driving the connecting seat (32).

7. A lumbar support adjustment mechanism according to claim 6, characterized in that: The connecting seat (32) and the lumbar support (3) are connected by the first elastic element.

8. A lumbar support adjustment mechanism according to claim 6, characterized in that: The bottom of the first accommodating cavity (231) has a protruding guide part (232), and the bottom of the connecting seat (32) is provided with a guide groove (35). The guide part (232) is inserted into the guide groove (35) and slides in fit.

9. A lumbar support adjustment mechanism according to claim 6, characterized in that: The rear end of the connecting seat (32) is provided with a third receiving cavity (33), and the front end of the first driving rod (77) and the front end of the second driving rod (78) extend into the third receiving cavity (33); The top of the connecting seat (32) is provided with a hinge hole (36), and the two hinge shafts are respectively connected to the front end of the first drive rod (77) and the front end of the second drive rod (78) through the two hinge holes (36).

10. A chair, characterized in that: The lumbar support adjustment mechanism includes any one of claims 1-9 above.

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