Office chair with lumbar support adjustment

Abstract

The utility model discloses a kind of office chair with waist support adjusting device, belong to office furniture field, including chair back main body, cushion main body, the waist support piece is movably connected on the chair back main body, one end of the waist support piece is rotatably connected with chair back main body and forms rotating end, the office chair further includes driver, one end of the driver is connected with chair back main body, and the other end is used to connect the free end of waist support piece, driver includes the driving rod that makes telescopic towards waist support piece, when the driving rod telescopes, the free end of waist support piece is rotated, to make the free end of the waist support piece produce displacement in front-back direction. So that waist support is more convenient in front-back direction adjustment, and stability is better.

Description

[Technical Field]

[0001] This utility model relates to an office chair with a lumbar support adjustment device, belonging to the field of office furniture. [Background Technology]

[0002] Office chairs are essential office furniture in daily work. As people's requirements for office furniture gradually increase, the comfort features of office chairs are also improving. Lumbar support is one of the comfort features that has become popular in recent years, used to support the human lower back.

[0003] The most traditional office chairs with lumbar support have a fixed, non-adjustable lumbar support. Later, adjustable lumbar supports appeared. Most of these lumbar supports are adjustable up and down, but have limited forward and backward adjustment. Even those that are adjustable in the forward and backward direction have relatively complex structures and poor stability. [Utility Model Content]

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an office chair with a lumbar support adjustment device, which makes the lumbar support more convenient to adjust in the front and back directions, and at the same time has better stability.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An office chair with a lumbar support adjustment device includes a backrest body and a seat cushion body. A lumbar support is movably connected to the backrest body, and one end of the lumbar support is rotatably connected to the backrest body to form a rotating end. The office chair also includes a driver, one end of which is connected to the backrest body, and the other end is used to connect to the free end of the lumbar support. The driver includes a drive rod that extends and retracts towards the lumbar support. When the drive rod extends and retracts, it drives the free end of the lumbar support to rotate, so that the free end of the lumbar support produces a forward and backward displacement.

[0007] The beneficial effects of using this utility model are as follows:

[0008] Firstly, in this invention, when the drive rod extends or retracts, it causes the free end of the lumbar support to move in the front-to-back direction, thus enabling the lumbar support to be adjusted in the front-to-back direction. Compared with structures that can only be adjusted up and down, this invention has stronger adjustment functionality.

[0009] Secondly, since the rotating end of the lumbar support component of this utility model is rotatably connected to the main body of the chair back, when the free end of the lumbar support component rotates, the front support point of the lumbar support component will also be displaced to a certain extent in the vertical direction. Therefore, with the help of the structure in this utility model, when the lumbar support component achieves displacement in the front-back direction, it will also produce a certain displacement in the vertical direction.

[0010] Finally, since the lumbar support component of this utility model includes a rotating end that is always connected to the main body of the chair back, and the free end that is driven by the drive rod, it is equivalent to the lumbar support component having support points at least at both ends. This can reduce the swaying of the lumbar support component to a certain extent and make the support more stable.

[0011] Preferably, the drive rod and the waist support are rotatably connected, and the axis of rotation is perpendicular to the driving direction.

[0012] Preferably, the actuator includes a screw and a nut sleeve that matches the screw, the nut sleeve forming the drive rod, and the screw being rotatably connected to the chair back body; or, the drive rod is a pressing rod, and the actuator further includes a locking mechanism for locking the pressing rod, and the drive rod is also connected to a reset member for resetting the pressing rod.

[0013] Preferably, when the driver includes a screw and a nut sleeve that matches the screw, the nut sleeve includes a first column and a second column that is perpendicular to the first column. The first column has a cavity and an internal thread on the inner wall of the cavity. The second column is rotatably connected to the waist support.

[0014] Preferably, the driver also includes a knob, which is fixedly connected to the screw and rotatably connected to the backrest body and positioned relative to the backrest body in the front-back direction.

[0015] Preferably, the main body of the chair back is also provided with an outer sleeve, and the screw and nut sleeve portion is built into the outer sleeve.

[0016] Preferably, the rotating end of the lumbar support is connected to the chair back body via a connector. The chair back body is provided with a movable groove for the connector to move in the vertical direction. When the drive rod extends and retracts to drive the lumbar support, the connector rotates relative to the chair back body and moves in the vertical direction along the movable groove.

[0017] Preferably, the backrest body is provided with a mounting groove, the mounting groove includes a first arc-shaped inner wall, the connecting member is a protrusion on the lumbar support extending toward the mounting groove, the protrusion has a first arc-shaped outer wall that matches and fits the first arc-shaped inner wall, the vertical travel distance of the mounting groove is greater than the vertical contour of the protrusion, and the inner cavity of the mounting groove forms the movable groove.

[0018] Preferably, a waist-shaped groove runs through the first arc-shaped inner wall, and a second arc-shaped inner wall is provided on the opposite side of the first arc-shaped inner wall. The chair back body is also provided with a fastener, which includes a slider and an embedded block provided on the slider. The slider is provided with a second arc-shaped outer wall that matches and fits the second arc-shaped inner wall. The embedded block passes through the waist-shaped groove and is connected to the protrusion.

[0019] Preferably, the chair back body is provided with a cover for covering the rotatable connection position between the lumbar support and the chair back body.

[0020] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0023] Figure 2 This is a schematic diagram of the back of Embodiment 1 of this utility model;

[0024] Figure 3 This is a partial explosion diagram of Embodiment 1 of the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of a local structure in the middle;

[0027] Figure 6 This is a front view of the main body of the chair back in Embodiment 1 of this utility model.

Detailed Implementation Methods

[0028] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0029] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element 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.

[0030] Example 1:

[0031] like Figures 1 to 6As shown in the figure, this embodiment demonstrates an office chair with a lumbar support adjustment device, including a backrest body 1 and a seat cushion body. In this embodiment, the backrest body 1 includes a backrest frame, and flexible materials such as mesh fabric (not shown in the figure) can be installed inside the backrest frame, which can be selected according to actual needs. At the same time, the backrest frame can also be equipped with armrests 3 as needed. A lumbar support 2 is movably connected to the backrest body 1. The lumbar support 2 is preferably located near the bottom of the backrest body 1. One end of the lumbar support 2 is rotatably connected to the backrest body 1 to form a rotating end. It should be noted that the lumbar support 2 can be rotatably connected to the backrest body 1 at its upper end or at its lower end. The office chair also includes a driver 4. One end of the driver 4 is connected to the backrest body 1, and the other end is used to connect to the free end of the lumbar support 2. The driver 4 includes a drive rod 41 that extends and retracts towards the lumbar support 2. When the drive rod 41 extends and retracts, it drives the free end of the lumbar support 2 to rotate, so that the free end of the lumbar support 2 produces a forward and backward displacement.

[0032] In this embodiment, when the drive rod 41 extends or retracts, it causes the free end of the lumbar support 2 to move forward and backward, thus enabling the lumbar support 2 to be adjusted in the forward and backward direction. Compared to the traditional structure that can only be adjusted vertically, this embodiment offers greater adjustment functionality. Secondly, since the rotating end of the lumbar support 2 is rotatably connected to the chair back body 1, when the free end of the lumbar support 2 rotates, the front support point of the lumbar support 2 will also move vertically to some extent. Therefore, with this design, the lumbar support 2 achieves both forward and backward displacement and vertical displacement. Finally, since the rotating end of the lumbar support 2 is always connected to the chair back body 1, and the free end is driven by the drive rod 41, it is equivalent to the lumbar support 2 having support points at least at both ends. This can reduce the swaying of the lumbar support 2 to some extent, resulting in better support stability.

[0033] To ensure smoother operation of the drive rod 41 in driving the lumbar support 2, the drive rod 41 and the lumbar support 2 are rotatably connected, with the axis of rotation perpendicular to the driving direction. Since the drive rod 41 extends and retracts towards the lumbar support 2 in this embodiment, and the lumbar support 2 itself also rotates, the connection between the drive rod and the lumbar support 2 may also involve slight rotation. Therefore, a rotatable connection is also provided between the drive rod 41 and the lumbar support 2. This not only makes the movement between the drive rod 41 and the lumbar support 2 smoother and reduces interference, but also improves the stability of the connection between the drive rod 41 and the lumbar support 2.

[0034] For this utility model, the structure of the driver 4 can be varied. This embodiment mainly introduces the driving method by rotation, as detailed below:

[0035] like Figure 3 and Figure 4 As shown, the actuator 4 includes a screw 42 and a nut sleeve that matches the screw 42. The nut sleeve forms the drive rod 41, and the screw 42 is rotatably connected to the chair back body 1. The nut sleeve and the screw 42 are connected by a threaded connection. When the screw 42 rotates, the nut sleeve moves relative to the screw 42 along the axial direction of the screw. When the nut sleeve moves axially, it drives the lumbar support 2 at the front end to produce a forward and backward displacement. This rotational operation method has the advantage of a higher degree of freedom in adjusting the position; the nut sleeve and the screw 42 can be suspended at any position.

[0036] In addition, such as Figure 4 As shown, in this embodiment, the nut sleeve includes a first column 411 and a second column 412 perpendicularly disposed to the first column 411. The first column 411 has a cavity, and the inner wall of the cavity has internal threads. The second column 412 is rotatably connected to the waist support 2. It should be noted that the structure of the nut sleeve is not limited to the shape and structure specified in this embodiment.

[0037] To ensure greater stability of the screw 42 and nut sleeve during operation, an outer sleeve 43 is also provided on the chair back body 1, with the screw 42 and nut sleeve partially housed within the outer sleeve 43. The outer sleeve 43 also provides external restraint for the nut sleeve in this embodiment, further reducing sway.

[0038] For ease of operation, the driver 4 in this embodiment also includes a knob 44. The knob 44 is fixedly connected to the screw by a screw. The knob 44 is rotatably connected to the backrest body 1 and is positioned relative to the backrest body in the front-back direction. That is, the knob 4 can rotate relative to the backrest body 1, but it is positioned relative to the backrest body in the front-back direction.

[0039] To further improve the comfort of the lumbar support 2, this embodiment also improves the rotating end of the lumbar support 2, combined with... Figure 5 and Figure 6 As shown, the rotating end of the lumbar support 2 is connected to the chair back body 1 via a connector. The chair back body 1 is provided with a movable groove for the connector to move vertically. When the drive rod 41 extends and retracts to drive the lumbar support 2, the connector rotates relative to the chair back body 1 and moves vertically along the movable groove. Since the front side of the lumbar support 2 is usually designed to fit as closely as possible to the human body, this provides better comfort. Therefore, in this embodiment, the lumbar support 2 not only has rotational movement at its rotating end but also vertical movement. With the adjustment of these two degrees of freedom, the front side of the lumbar support 2 can maintain a uniform fit with the human body as much as possible after rotation. It should be noted that the design positions of the connector and the movable groove can be interchanged.

[0040] In this embodiment, the specific structure of the rotating end is as follows: The chair back body 1 is provided with a mounting groove 52, which includes a first arc-shaped inner wall 521. The connecting member is a protrusion 51 extending towards the mounting groove 52 on the lumbar support 2. The protrusion 51 has a first arc-shaped outer wall 511 that matches and fits against the first arc-shaped inner wall 521. The vertical travel distance of the mounting groove 52 is greater than the vertical contour dimensions of the protrusion 51, and the inner cavity of the mounting groove 52 forms the movable groove. With this design, since the first arc-shaped outer wall 511 of the protrusion 51 and the first arc-shaped inner wall 521 of the mounting groove 52 match and fit, the protrusion 51 can rotate along the first arc-shaped inner wall 521 of the mounting groove 52, thus forming a rotating connection. Furthermore, for the mounting groove 52, since the vertical travel distance is designed to be greater than the vertical dimensions of the protrusion 51 itself, the protrusion 51 can achieve vertical displacement within the mounting groove 52. Therefore, this design in this embodiment realizes the rotation and vertical movement of the protrusion 51 within the mounting groove 52.

[0041] In this embodiment, in order to enhance the stability of the lumbar support 2 in rotation and vertical movement, there are two mounting grooves 52, and correspondingly, there are also two protrusions 51.

[0042] It should be noted that in other embodiments, the structure is not limited to that of this embodiment. For example, the connector may be a connecting shaft, and an arc-shaped waist-shaped hole may be provided on the main body of the chair back, with the connecting shaft housed within the arc-shaped waist-shaped hole. Alternatively, the positions of the mounting groove and the protrusion may be interchanged, and other solutions can also achieve the above objectives.

[0043] To ensure that the protrusion 51 remains within the mounting groove 52, in this embodiment, a waist-shaped groove 523 extends through the first arc-shaped inner wall 521, and a second arc-shaped inner wall 522 is provided on the opposite side of the first arc-shaped inner wall 521. The chair back body 1 is also provided with a fastener 53, which includes a slider 531 and an insert block 532 disposed on the slider 531. The slider 531 has a second arc-shaped outer wall (not shown in the figure due to perspective) that matches and fits the second arc-shaped inner wall 522. The insert block 532 passes through the waist-shaped groove 523 and connects to the protrusion 51. With this design, this embodiment provides front-to-back directional limiting for the protrusion 51, and the fastener 53 ensures that the protrusion 51 always remains in contact with the first arc-shaped inner wall 521. In this embodiment, in order to allow the fastener 53 to also move in contact, a second arc-shaped outer wall is designed for the fastener 53. In this way, the fastener 53 can also rotate in close contact with the second arc-shaped inner wall 522. The waist-shaped groove 523 is designed to allow the embedded block 532 to avoid movement when it moves up and down.

[0044] To make the back of the chair back body 1 more uniform and coordinated, and to enhance the protection of the lumbar support 2 and the chair back body 1 at the rotating position, the chair back body 1 in this embodiment is provided with a cover 12 for covering the rotating connection position between the lumbar support 2 and the chair back body 1. The cover 12 can cover only some exposed holes at the connection position, or the coverage area can be expanded, or it can be designed with a certain shape, etc. Taking this embodiment as an example, on the back of the chair back body 1, the two back holes actually exposed are formed on opposite sides of the mounting groove 52. The cover 12 can be designed as two independent covers that only cover the two back holes on opposite sides of the mounting groove 52, or it can be designed as a single, full-surface cover 12 to cover both back holes simultaneously. This embodiment shows the implementation method that covers both back holes simultaneously.

[0045] Example 2:

[0046] The difference between this embodiment and Embodiment 1 is that Embodiment 1 uses a knob rotation method for adjustment, while this embodiment uses a pressing operation method. In this embodiment, the drive rod is a pressing rod, and the driver also includes a locking mechanism for locking the pressing rod. The drive rod is also connected to a reset member, which is used to reset the pressing rod.

[0047] There are several ways to lock the push rod. For example, it can be locked by setting a locking hole on the push rod and locking it with a pin; or it can be locked by a buckle-like structure; or it can be locked by a rebound mechanism, etc.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An office chair with a lumbar support adjustment device, comprising a backrest body and a seat cushion body, wherein a lumbar support is movably connected to the backrest body, characterized in that, One end of the lumbar support is rotatably connected to the backrest body to form a rotating end. The office chair also includes a driver. One end of the driver is connected to the backrest body, and the other end is used to connect to the free end of the lumbar support. The driver includes a drive rod that extends and retracts towards the lumbar support. When the drive rod extends and retracts, it drives the free end of the lumbar support to rotate, so that the free end of the lumbar support produces a front-to-back displacement.

2. An office chair with a lumbar support adjustment device as described in claim 1, characterized in that: The drive rod and the waist support are rotatably connected, and the axis of rotation is perpendicular to the driving direction.

3. An office chair with a lumbar support adjustment device as described in claim 1, characterized in that: The actuator includes a screw and a nut sleeve that matches the screw, the nut sleeve forming the drive rod, and the screw being rotatably connected to the chair back body; or, the drive rod is a pressing rod, and the actuator further includes a locking mechanism for locking the pressing rod, and the drive rod is also connected to a reset member for resetting the pressing rod.

4. An office chair with a lumbar support adjustment device as described in claim 3, characterized in that: When the driver includes a screw and a nut sleeve that matches the screw, the nut sleeve includes a first column and a second column that is perpendicular to the first column. The first column has a cavity and an internal thread on the inner wall of the cavity. The second column is rotatably connected to the waist support.

5. An office chair with a lumbar support adjustment device as described in claim 3, characterized in that: The driver also includes a knob, which is fixedly connected to the screw and is rotatably connected to the chair back body and positioned relative to the chair back body in the front-back direction.

6. An office chair with a lumbar support adjustment device as described in claim 3, characterized in that: The main body of the chair back is also provided with an outer sleeve, and the screw and nut sleeve are built into the outer sleeve.

7. An office chair with a lumbar support adjustment device as described in any one of claims 1 to 6, characterized in that: The rotating end of the lumbar support is connected to the chair back body via a connector. The chair back body is provided with a movable groove for the connector to move in the vertical direction. When the drive rod extends and retracts to drive the lumbar support, the connector rotates relative to the chair back body and moves in the vertical direction along the movable groove.

8. An office chair with a lumbar support adjustment device as described in claim 7, characterized in that: The main body of the chair back is provided with a mounting groove, the mounting groove includes a first arc-shaped inner wall, the connecting member is a protrusion on the lumbar support extending toward the mounting groove, the protrusion has a first arc-shaped outer wall that matches and fits the first arc-shaped inner wall, the vertical travel distance of the mounting groove is greater than the vertical contour of the protrusion, and the inner cavity of the mounting groove forms the movable groove.

9. An office chair with a lumbar support adjustment device as described in claim 8, characterized in that: A waist-shaped groove runs through the first arc-shaped inner wall, and a second arc-shaped inner wall is provided on the opposite side of the first arc-shaped inner wall. The chair back body is also provided with a fastener, which includes a slider and an embedded block provided on the slider. The slider is provided with a second arc-shaped outer wall that matches and fits the second arc-shaped inner wall. The embedded block passes through the waist-shaped groove and is connected to the protrusion.

10. An office chair with a lumbar support adjustment device as described in claim 1, characterized in that: The main body of the chair back is provided with a cover to cover the rotatable connection position between the lumbar support and the main body of the chair back.

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