Swivel chair with adjustable waist rest

Abstract

The utility model relates to a swivel chair, in particular to a swivel chair with an adjustable waist rest. Belongs to the technical field of office chairs. A swivel chair with an adjustable waist rest comprises chair legs, a gas spring supporting column mounted based on the chair legs, a tray arranged at the upper end of the gas spring supporting column, and a chair seat, armrests and a backrest which are arranged based on the tray, the chair further comprises a waist rest arranged in a waist rest arrangement space reserved between the backrest and the chair seat. The waist rest comprises two vertically-arranged mounting columns, an upper backup plate and a lower backup plate, wherein the upper backup plate and the lower backup plate are arranged on the basis of the mounting columns. The number of the upper backup plates is two, and the upper backup plates are installed on the two installation columns in a lifting adjusting mode respectively. The upper leaning piece and the lower leaning piece are arranged and mounted on the two mounting columns in a liftable manner, so that the upper waist and the lower waist of a user can be supported at the same time, the lifting adjustment of the upper leaning piece and the lower leaning piece is realized, and the use comfort of the user is improved.

Description

Technical Field

[0001] This utility model relates to a swivel chair, and more particularly to a swivel chair with adjustable lumbar support. It belongs to the technical field of office chairs. Background Technology

[0002] A swivel chair is a chair with a rotating base and usually equipped with casters for easy movement. Its main features include: swivel function: the base can rotate 360 ​​degrees, allowing users to switch between different orientations; mobility: casters at the bottom facilitate movement on smooth surfaces; adjustability: most swivel chairs have adjustable seat height, armrests, and backrest angles for enhanced comfort; and versatility: commonly found in offices, conference rooms, and other similar locations.

[0003] Because prolonged sitting can easily lead to lumbar fatigue, some higher-end swivel chairs are equipped with lumbar supports or backrests. For example, utility model patent CN 222367373 U discloses a chair with an adjustable lumbar support device. This chair includes a backrest, lumbar support, seat, and support rod; the lumbar support and backrest are separate, and the seat has an adjustment compartment; one end of the support rod is connected to the lumbar support, and the other end is inserted into the adjustment compartment, which contains an adjustment mechanism that moves the support rod; the adjustment mechanism includes a lead screw, a driver that controls the rotation of the lead screw, and an adjusting nut that cooperates with the lead screw. The adjusting nut is fixed to a slider, which is connected to the support rod. The lumbar support of this chair can be adjusted forward and backward through the adjustment compartment at the bottom, thereby adjusting the stroke of the lumbar support to meet the needs of different users in different sitting postures.

[0004] For example, utility model patent CN215820307U discloses a chair with an adaptively adjustable lumbar support. This chair includes a seat, a base, a backrest, and a lumbar support. The seat is located above the base and is inserted into it. The backrest is installed at the rear end of the seat. The upper end of the lumbar support is installed on the backrest's support surface, while the lower end is suspended and located at the front end of the support surface. An adaptively adjustable elastic element is provided between the lower end of the lumbar support and the support surface to keep the lower end of the lumbar support suspended. This chair's lumbar support, by maintaining its lower end suspended through the adaptive elastic element, adjusts the force required to support the lumbar region, thus meeting the different users' needs for lumbar support.

[0005] The two solutions mentioned above, one improving the range of motion and the other modifying the load-bearing capacity, meet the general needs of most users. However, some users may have physiological problems in their lower back, such as lumbar muscle strain or herniated discs. Since the specific locations of lumbar muscle strain and herniated discs often vary, and users may also have a need for greater flexibility in adjusting the lumbar support, there is an urgent need in this field for a chair with height-adjustable lumbar support. Utility Model Content

[0006] In view of the problems mentioned in the background art, this utility model provides a swivel chair with adjustable lumbar support. The swivel chair of this utility model is equipped with an adjustable lumbar support to meet the needs of different users for adjusting the lumbar support position.

[0007] The technical solution of this utility model to solve the above problems is as follows:

[0008] An adjustable swivel chair includes chair legs, gas spring support columns mounted on the chair legs, a tray disposed on the upper end of the gas spring support columns, and a seat, armrests, and backrest disposed on the tray; it also includes a lumbar support disposed in a lumbar support space left between the backrest and the seat, the lumbar support including two vertically arranged mounting columns, an upper backrest plate and a lower backrest plate disposed on the mounting columns; the upper backrest plate has two parts, which are respectively height-adjustably mounted on the two mounting columns.

[0009] In the above-mentioned technical solution of this utility model, by setting an upper backrest and a lower backrest on the mounting column, the lumbar support of the swivel chair can be raised and lowered as needed, achieving simultaneous support for the upper and lower back, which significantly improves the user's comfort.

[0010] Preferably, the upper back plate is mounted on the mounting column via an upper back plate bracket; the upper back plate bracket includes a bracket portion for mounting the upper back plate and a locking portion for fixing it to the mounting column.

[0011] Preferably, the space for the lumbar support is large enough that the lower backrest is not interfered with by the chair seat during adjustment, or the degree of interference is small enough to be overcome by the deformation of the lower backrest itself or the chair seat.

[0012] Preferably, the lumbar support space of sufficient size is formed by moving the seat forward and / or moving the backrest back.

[0013] Preferably, the mounting post is fixed to the backrest.

[0014] Preferably, the lumbar support also includes a lumbar support plate, and the mounting column is fixed to the lumbar support plate.

[0015] Preferably, the lumbar support is directly or indirectly installed to the tray via its bottom, with its main body resting against the backrest.

[0016] Preferably, the locking part includes a locking part housing with a mounting post passage, a latch disposed in the locking part housing and having a lock thread end that can extend out of the locking part housing, a return spring for pressing the latch against the mounting post, and a pressing handle for driving the latch to compress the return spring in a direction away from the mounting post.

[0017] Preferably, the portion of the pressing handle located inside the locking housing forms an inclined working end, and a universal ball is provided on the inclined working end; an inclined surface for supporting the universal ball is provided at the corresponding position of the locking tongue.

[0018] Preferably, the lower back plate is provided and is mounted to the two mounting posts via a lower back plate bracket; the lower back plate bracket includes a second bracket portion for mounting the lower back plate and a second locking portion for fixing to the mounting posts; the second locking portion includes a second locking portion housing having a second mounting post through-channel, a second latch disposed within the second locking portion housing and having a second lock thread, the end of which can extend out of the second locking portion housing, a second return spring for pressing the second latch against the mounting post, and a second pressing handle for driving the second latch to compress the second return spring in a direction away from the mounting post.

[0019] Preferably, the portion of the second pressing handle located inside the housing of the second locking part forms a second inclined working end, and a second universal ball is provided on the second inclined working end; an inclined surface for carrying the second universal ball is provided at the corresponding position of the second locking tongue.

[0020] In summary, this utility model has the following beneficial effects:

[0021] 1. This utility model provides simultaneous support for the user's upper and lower back by setting up upper and lower back support pieces, thereby improving user comfort.

[0022] 2. This utility model achieves height adjustment of the upper and lower backrests by mounting the upper and lower backrests on two mounting columns, further improving user comfort.

[0023] 3. The upper and lower support plates of this utility model are respectively installed to the mounting column through the upper support plate bracket and the lower support plate bracket. The internal structure of the bracket allows for easy locking and unlocking with the mounting column by simply squeezing and pressing the handle. Therefore, it has the advantages of simple structure and convenient use. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of Example 1;

[0025] Figure 2 yes Figure 1 Side view;

[0026] Figure 3 This is a schematic diagram of the state when the lower support piece is adjusted to the lower limit position in Example 1;

[0027] Figure 4This is a three-dimensional structural diagram of the lumbar support in Example 1;

[0028] Figure 5 This is a schematic diagram of the upper and lower support plates in Embodiment 1;

[0029] Figure 6 This is a side view of the lumbar support structure in Embodiment 2.

[0030] The component names represented by the labels in the above diagram are as follows:

[0031] 1. Chair legs,

[0032] 2. Gas spring support column,

[0033] 3. Pallet

[0034] 4. Chair seat

[0035] 5. Handrails

[0036] 6. Backrest

[0037] 7. Lumbar support

[0038] 8. Headrest

[0039] 9. Space for lumbar support.

[0040] 71. Lumbar support board

[0041] 72. Install the column.

[0042] 73. Upper backboard,

[0043] 74. Upper support plate bracket,

[0044] 75. Lower back panel,

[0045] 76. Lower support plate bracket,

[0046] 741. Support section

[0047] 742. Locking section

[0048] 761. Second support section

[0049] 762. Second locking unit,

[0050] 7421. Install column through-passage.

[0051] 7422, Locking Tongue,

[0052] 7423. Return spring,

[0053] 7424. Press the handle.

[0054] 7425, Universal Ball Bearing,

[0055] 7621. Second installation column through-channel,

[0056] 7622, ​​Second locking tongue,

[0057] 7623. Second return spring,

[0058] 7624. Second press handle,

[0059] 7625. Second universal ball bearing. Detailed Implementation

[0060] The present invention will be further explained below with reference to the accompanying drawings.

[0061] This specific embodiment is merely an explanation of the present invention and is not intended to limit it. Any changes made by those skilled in the art after reading this specification, as long as they fall within the scope of the claims, will be protected by patent law.

[0062] Example 1

[0063] A swivel chair with adjustable lumbar support, such as Figure 1 and Figure 2 As shown. It includes chair legs 1, gas spring support columns 2, a tray 3, a seat 4, armrests 5, a backrest 6, a lumbar support 7, and a headrest 8. Chair legs 1 are the most common type of five-star chair legs. Gas spring support columns 2 are a fixed component of the five-star chair legs. The tray 3 is a fixed component of the gas spring support columns 2. The seat 4, armrests 5, and backrest 6 are all based on the tray 3. Figure 2 As shown, the lumbar support 7 is set in the lumbar support setting space 9, which is formed by the backrest 6 being slightly moved back and the seat 4 being slightly moved forward.

[0064] Specifically, such as Figure 1 and Figure 2 As shown, the lumbar support 7 includes mounting posts 72, an upper backrest 73, and a lower backrest 75. There are two mounting posts 72, which in this embodiment are directly fixed to the backrest 6. There are two upper backrests 73, each adjustablely mounted on one of the two mounting posts 72. Furthermore, the upper backrests 73 are mounted on the mounting posts 72 via upper backrest brackets 74.

[0065] like Figure 4 As shown, the upper support plate bracket 74 includes a support portion 741 for mounting the upper support plate and a locking portion 742 for fixing it to the mounting post. Figure 5As shown, the locking part 742 includes a locking part housing, a latch 7422, a return spring 7423, and a pressing handle 7424. The locking part housing has a mounting post through-channel 7421, through which the upper support plate bracket is sleeved on the mounting post 72, and the inner wall of the channel has a corrugated surface to increase the coefficient of friction. The latch 7422 is movably installed inside the locking part housing, and its end has a locking thread. Figure 5 The locking mechanism, indicated by a wavy line, extends beyond the locking housing. A return spring 7423 is also located inside the locking housing, providing elastic force to keep the latch 7422 extending away from the locking housing. The portion of the pressing handle 7424 located inside the locking housing forms a beveled end, on which a universal ball bearing 7425 is mounted; a corresponding bevel bearing supporting the universal ball bearing 7425 is located on the latch 7422. Therefore, under the action of the return spring 7423, the locking housing, with its mounting post passage 7421, cooperates with the latch 7422 to fix the bracket 741 to the mounting post 72. Simultaneously, pressing the pressing handle 7424 retracts the latch 7422 towards the locking housing. Thus, the locking state based on the latch 7422 is released, allowing the bracket 741 to move freely up and down on the mounting post 72. After the height position adjustment is completed, release the pressing handle 7424, and the locking tongue 7422 can continue to extend away from the locking housing, thereby completing the locking again.

[0066] like Figure 4 As shown, the lower support plate bracket 76 includes a second support portion 761 for mounting the lower support plate and a second locking portion 762 for fixing to the mounting post. Figure 5 As shown, the second locking part 762 includes a second locking part housing, a second locking tongue 7622, ​​a second return spring 7623, and a second pressing handle 7624. The second locking part housing has a second mounting post through-channel 7621, through which the lower back plate bracket 76 is sleeved on the mounting post 72, and the inner wall of the channel has a corrugated surface to increase the coefficient of friction. The second locking tongue 7622 is movably installed inside the second locking part housing, and its end has a locking thread. Figure 5The second locking part housing is indicated by a wavy line, where the end with the locking pattern extends outwards. A second return spring 7623 is also located inside the second locking part housing, providing elastic force to ensure the second latch 7622 always extends away from the second locking part housing. The portion of the second pressing handle 7624 located inside the second locking part housing forms a beveled end, on which a second universal ball bearing 7625 is provided; a corresponding bevel bearing supporting the second universal ball bearing 7625 is provided at the position of the second latch 7622. Therefore, under the action of the second return spring 7623, the second locking part housing, with the second mounting post through-channel 7621, cooperates with the second latch 7622 to fix the second support part 761 to the mounting post 72. Simultaneously, pressing the second pressing handle 7624 retracts the second latch 7622 towards the second locking part housing. Therefore, the locking state based on the second latch 7622 can be released, allowing the second support part 761 to move freely up and down on the mounting post 72. After the height position adjustment is completed, release the second pressing handle 7624, and the second locking tongue 7622 can continue to extend away from the locking housing, thereby completing the locking again.

[0067] Figure 3 The image shows the lower backrest 75 when adjusted to its lower limit position. At this point, there is slight interference between the lower backrest 75 and the seat 4, but since the corresponding part of the seat 4 is flexible, this interference can be resolved by slight deformation of the seat 4 itself. To improve the lumbar support provided by the lower backrest 75, it is generally made of rigid material, typically plastic such as PP or PET, but can be covered with fabric, mesh, or leather to enhance the tactile and visual texture.

[0068] Example 2

[0069] The difference from Example 1 is that, as Figure 6 As shown, the lumbar support 7 also includes a lumbar support plate 71, and the mounting post 72 is fixed to the lumbar support plate 71. The lumbar support plate 71 is directly or indirectly installed to the tray 3 through its bottom, and its main body rests against the backrest 6. Other parts are the same as in Embodiment 1.

Claims

1. A swivel chair with adjustable lumbar support, comprising a chair leg (1), a gas spring support column (2) mounted on the chair leg, a tray (3) disposed on the upper end of the gas spring support column, and a seat (4), armrests (5), and backrest (6) disposed on the tray; characterized in that: It also includes a lumbar support (7) set in the lumbar support space (9) left between the backrest (6) and the seat (4). The lumbar support (7) includes two vertically arranged mounting columns (72), an upper backrest (73) and a lower backrest (75) set based on the mounting columns. The upper backrest (73) has two pieces, which are respectively raised and lowered and adjusted on the two mounting columns (72).

2. The adjustable lumbar support swivel chair according to claim 1, characterized in that: The upper back plate (73) is mounted on the mounting post (72) via an upper back plate bracket (74); the upper back plate bracket (74) includes a bracket part (741) for mounting the upper back plate and a locking part (742) for fixing to the mounting post.

3. A swivel chair with adjustable lumbar support according to claim 1 or 2, characterized in that: The space for the lumbar support is large enough that the lower backrest (75) is not interfered with by the chair seat during adjustment, or the degree of interference is small enough to be overcome by the deformation of itself or the chair seat.

4. A swivel chair with adjustable lumbar support according to claim 3, characterized in that: The lumbar support space (9) of sufficient size is formed by moving the seat (4) forward and / or moving the backrest (6) backward.

5. A swivel chair with adjustable lumbar support according to claim 1 or 2, characterized in that: The mounting post (72) is fixed to the backrest (6).

6. A swivel chair with adjustable lumbar support according to claim 1 or 2, characterized in that: The lumbar support (7) also includes a lumbar support plate (71), and the mounting column (72) is fixed to the lumbar support plate (71).

7. A swivel chair with adjustable lumbar support according to claim 6, characterized in that: The lumbar support (71) is directly or indirectly installed to the tray (3) through its bottom, and the main body rests against the backrest (6).

8. A swivel chair with adjustable lumbar support according to claim 2, characterized in that: The locking part (742) includes a locking part housing having a mounting post through-channel (7421), a latch (7422) disposed inside the locking part housing and having a lock thread end that can extend out of the locking part housing, a return spring (7423) for pressing the latch against the mounting post (72), and a pressing handle (7424) for driving the latch (7422) to compress the return spring in a direction away from the mounting post (72).

9. A swivel chair with adjustable lumbar support according to claim 8, characterized in that: The portion of the pressing handle (7424) located inside the housing of the locking part forms an inclined working end, and a universal ball (7425) is provided on the inclined working end; the corresponding position of the locking tongue (7422) is provided with an inclined surface that carries the universal ball (7425).

10. A swivel chair with adjustable lumbar support according to claim 1, characterized in that: The lower back plate (75) is provided and is mounted on the two mounting posts (72) via a lower back plate bracket (76); the lower back plate bracket (76) includes a second bracket part (761) for mounting the lower back plate and a second locking part (762) for fixing to the mounting posts; the second locking part (762) includes a second locking part housing having a second mounting post through channel (7621), a second latch (7622) disposed in the second locking part housing and having a second lock thread, the end of which can extend out of the second locking part housing, a second return spring (7623) for pressing the second latch against the mounting post (72), and a second pressing handle (7624) for driving the second latch (7622) to compress the second return spring in a direction away from the mounting post (72).

Images