Back support device and seat

Abstract

This application relates to a back support device and a seat. The back support device includes a backrest, a support frame, and a sliding mechanism. The backrest is movably connected to the sliding mechanism, and the sliding mechanism is also movably connected to the support frame. The sliding mechanism has a first working state and a second working state. When the sliding mechanism is in the first working state, the backrest can move relative to the sliding mechanism towards or away from the support frame under the action of an external force. When the sliding mechanism is in the second working state, the backrest can drive the sliding mechanism to move towards or away from the support frame under the action of an external force, so that the backrest can adjust its position relative to the support frame according to different body shapes and different sitting postures, which helps to alleviate fatigue and injury to the human back.

Description

[Technical Field]

[0001] This invention relates to the field of office furniture and supplies technology, and in particular to a back support device and a chair. [Background Technology]

[0002] With the rapid development of science and technology and the continuous improvement of living standards, health has become an increasingly important topic of concern. While science has liberated people from physical labor, it has also led to prolonged periods of sedentary mental work. Existing office or home chairs typically consist of a seat cushion and a backrest. The seat cushion supports the buttocks, and the backrest supports the back. However, existing backrests are generally fixed to the seat cushion. As people adjust their sitting posture, the backrest cannot adapt to different postures and body types, resulting in the back not fully conforming to the backrest and consequently causing fatigue and injury. [Summary of the Invention]

[0003] In order to overcome the above-mentioned defects, this application provides a back support device and a seat to solve the problem that the backrests of existing office or home chairs cannot be properly adjusted according to different sitting postures and body types.

[0004] In a first aspect, embodiments of this application provide a back support device, including a chair back, a support frame, and a sliding mechanism. The chair back is movably connected to the sliding mechanism, and the sliding mechanism is also movably connected to the support frame. The sliding mechanism has a first working state and a second working state. When the sliding mechanism is in the first working state, the chair back can move relative to the sliding mechanism towards or away from the support frame under the action of an external force. When the sliding mechanism is in the second working state, the chair back can drive the sliding mechanism to move towards or away from the support frame under the action of an external force.

[0005] In the above scheme, when the sliding mechanism is in the first working state, the chair back can move towards or away from the support frame under the action of external force, while the sliding mechanism remains stationary relative to the support frame. This allows the chair back to adjust its height relative to the support frame in the vertical direction according to different body shapes. When the sliding mechanism is in the second working state, as the human body's sitting posture is continuously adjusted, the human back will apply external force to the chair back, causing the chair back to move towards or away from the support frame under the action of external force. This allows the chair back to adjust its position relative to the support frame according to different sitting postures, and ensures that the chair back can always support and hold the human back, which helps to alleviate fatigue and injury to the human back.

[0006] In conjunction with the first aspect, in some embodiments, the chair back includes a backrest and a mounting frame, the mounting frame having a mounting cavity, a sliding mechanism being accommodated in the mounting cavity, and at least a portion of a support frame being inserted into the mounting cavity.

[0007] In the above solution, by housing the sliding mechanism within the mounting cavity, it is beneficial to the compact design of the back support device; in addition, during the movement of the chair back relative to the support frame, at least a portion of the support frame is always inserted into the mounting cavity, preventing the chair back from shaking or falling off.

[0008] In conjunction with the first aspect, in some embodiments, the sliding mechanism includes a sliding component and a locking component, the sliding component being movably connected to the support frame, and the locking component being movably connected to the mounting frame; when the sliding mechanism is in a first working state, the locking component is disconnected from the mounting frame, so that the chair back can move relative to the sliding mechanism; when the sliding mechanism is in a second working state, the locking component is connected to the mounting frame, so that the chair back can drive the sliding mechanism to move together.

[0009] In the above scheme, the sliding mechanism is connected to or disconnected from the mounting bracket through the locking component. When the sliding mechanism is in the first working state, that is, the locking component is disconnected from the mounting bracket, the chair back moves under the action of external force, while the sliding mechanism remains stationary. When the sliding mechanism is in the second working state, that is, the locking component is connected to the mounting bracket, the chair back can drive the sliding mechanism to move together under the action of external force.

[0010] In conjunction with the first aspect, in some embodiments, the sliding assembly includes a sliding seat and a first elastic element, the first elastic element being connected between the sliding seat and the support frame; the sliding seat is provided with at least one sliding part, and the support frame is provided with at least one mating part, wherein any sliding part and a mating part are movably connected.

[0011] In the above scheme, when the sliding mechanism is in the second working state, the backrest can drive the sliding seat to move closer to or further away from the support frame under the action of external force, so that the first elastic element is in a compressed or stretched state and stores elastic potential energy. When the external force on the backrest is released or reduced, the backrest can return a certain distance under the action of the elastic force of the first elastic element, thereby ensuring that the backrest can adjust its position relative to the support frame according to different sitting postures.

[0012] In conjunction with the first aspect, in some embodiments, the sliding portion includes a groove extending in a vertical direction, and the mating portion includes a guide rail extending in a vertical direction, the guide rail being movably embedded in the groove; and / or, the sliding portion includes a guide rail extending in a vertical direction, and the mating portion includes a groove extending in a vertical direction, the guide rail being movably embedded in the groove.

[0013] In the above solution, the cooperation between the slide and the guide rail ensures that the sliding seat does not shift or wobble during movement, which facilitates the smooth movement of the chair back.

[0014] In conjunction with the first aspect, in some embodiments, the sliding part includes a mounting hole that extends vertically through the sliding seat, and the mating part includes a guide post disposed on the support frame, wherein the guide post extends vertically and at least a portion of the guide post is inserted into the mounting hole.

[0015] In the above solution, the cooperation between the guide post and the mounting hole ensures that the sliding seat does not shift or wobble during movement, which facilitates the smooth movement of the chair back.

[0016] In conjunction with the first aspect, in some embodiments, the sliding assembly further includes at least one roller rotatably disposed on the sliding seat and in contact with the support frame; and / or, the sliding assembly further includes at least one roller rotatably disposed on the support frame and in contact with the sliding seat.

[0017] In the above solution, by setting rollers on the sliding seat and / or support frame, the friction between the sliding seat and the support frame is reduced, ensuring that the sliding seat can move smoothly.

[0018] In conjunction with the first aspect, in some embodiments, the locking component includes a positioning member and a second elastic member, the second elastic member being connected between the positioning member and the sliding seat; the inner sidewall of the mounting bracket is provided with a plurality of positioning grooves in the vertical direction, at least a portion of the positioning member being insertable into the positioning grooves.

[0019] In the above scheme, when the sliding mechanism is in the first working state, the chair back can move towards or away from the support frame under the action of external force. During this process, the positioning member can first fall out of a certain positioning groove, and then move to another positioning groove under the action of the second elastic member. The height of the chair back relative to the support frame in the vertical direction is maintained by the cooperation between the positioning member and the positioning groove.

[0020] In conjunction with the first aspect, in some embodiments, the positioning member includes a connecting portion and a plug portion, the connecting portion extending in a vertical direction and connected to a second elastic member, and the plug portion extending from the surface of the connecting portion away from the sliding seat toward a direction close to the positioning groove.

[0021] In the above scheme, when the sliding mechanism is in the first working state, the chair back can apply a certain force to the plug-in part under the action of external force. The plug-in part transmits this force to the connecting part, so that the connecting part can drive the second elastic member to undergo elastic deformation, thereby allowing the plug-in part to move away from the positioning groove and disengage from the positioning groove, realizing the release of the locking component from the mounting bracket. When the chair back moves into place, under the elastic force of the second elastic member, the connecting part can drive the plug-in part to move closer to the positioning groove and plug into the positioning groove, realizing the connection of the locking component and the mounting bracket.

[0022] Secondly, embodiments of this application provide a seat including the back support device described in any of the foregoing claims.

[0023] In the above solution, when the user is not yet seated, the user can apply a certain force to the backrest, causing the backrest to move independently towards or away from the support frame. This allows the chair with the back support device to adjust the position of the backrest relative to the support frame according to different body shapes. When the user sits in the chair, as the user's posture is continuously adjusted, the user's back can apply a certain force to the backrest, causing the backrest to move along with the sliding mechanism towards or away from the support frame. This allows the chair with the back support device to adjust the position of the backrest relative to the support frame according to different sitting postures, effectively alleviating fatigue and injury to the user's back.

[0024] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. [Attached Image Description]

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of a seat provided in an embodiment of this application.

[0027] Figure 2 for Figure 1 The diagram shows a magnified view of the partial structure of the seat at point A.

[0028] Figure 3 for Figure 1 The diagram shows how the seat back position is adjusted according to the human sitting posture.

[0029] Figure 4 for Figure 3The diagram shows a magnified view of the partial structure of the seat at point B.

[0030] Figure 5 for Figure 1 The diagram shows the structure of the seat in another state.

[0031] Figure 6 for Figure 5 The diagram shows a magnified view of the partial structure of the seat at point C.

[0032] Figure 7 for Figure 5 The diagram shows how the seat back position is adjusted according to the human sitting posture.

[0033] Figure 8 for Figure 7 The diagram shows a magnified view of the partial structure of the seat at point D.

[0034] Figure 9 for Figure 1 The diagram shows the structure of the seat in another state.

[0035] Figure 10 for Figure 9 The diagram shows a magnified view of the partial structure of the seat at point E.

[0036] Figure label:

[0037] 1000 - Seats;

[0038] 100-Back support device;

[0039] 1-Backrest; 11-Backrest cushion; 12-Mounting bracket; 13-Positioning groove; 2-Sliding mechanism; 21-Sliding assembly; 211-Sliding seat; 212-First elastic element; 22-Locking assembly; 221-Positioning element; 2211-Connecting part; 2212-Plug-in part; 222-Second elastic element; 3-Support frame; 31-First bracket; 32-Second bracket;

[0040] 200-seat cushion;

[0041] 300 - Chair legs;

[0042] 310 - Support foot; 320 - Steering wheel;

[0043] 400 - Position adjustment device;

[0044] 410 - Tilting adjustment mechanism; 420 - Lifting mechanism;

[0045] 500-Handrail;

[0046] 600-headrest.

Detailed Implementation Methods

[0047] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0049] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0050] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0051] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0052] It should be noted that the steps shown in the flowcharts in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Although a logical order is shown in the flowcharts, the order of the steps in each embodiment is not limited to the order arranged in this specification. In some cases, the implementation steps may be adjusted according to specific needs, and the steps shown or described may be performed in a different order than that shown here.

[0053] Existing office or home chairs typically consist of a seat cushion and a backrest. The seat cushion supports the buttocks, while the backrest supports the back. However, existing backrests are generally fixed to the seat cushion. As people adjust their sitting posture, the backrest cannot adapt its position accordingly. In other words, the backrest cannot adjust its position properly based on different sitting postures and body types, resulting in the back not fully conforming to the backrest and consequently causing fatigue and injury to the back.

[0054] To address the aforementioned technical problems, this application provides a back support device, including a chair back, a support frame, and a sliding mechanism. The chair back is movably connected to the sliding mechanism, and the sliding mechanism is also movably connected to the support frame. The sliding mechanism has a first working state and a second working state. When the sliding mechanism is in the first working state, the chair back can move relative to the sliding mechanism towards or away from the support frame under the action of an external force. When the sliding mechanism is in the second working state, the chair back can drive the sliding mechanism to move towards or away from the support frame under the action of an external force.

[0055] The back support device disclosed in this application can be, but is not limited to, office chairs, home chairs, computer chairs, gaming chairs, ergonomic chairs, wheelchairs, children's chairs, car seats, and other types of seats.

[0056] Please see Figure 1 , Figure 3 , Figure 5 , Figure 7 and Figure 9 This application provides a seat 1000, which includes at least a back support device 100, a seat cushion 200 and a chair leg 300. The seat cushion 200 is directly or indirectly connected to the chair leg 300, and the back support device 100 is directly or indirectly connected to the seat cushion 200. The seat cushion 200 is used to support the buttocks of a human body, and the back support device 100 is used to support the back of a human body.

[0057] Please see Figures 2 to 8 The back support device 100 includes a chair back 1, a support frame 3 and a sliding mechanism 2. The chair back 1 is movably connected to the sliding mechanism 2, and the sliding mechanism 2 is also movably connected to the support frame 3. The end of the support frame 3 away from the sliding mechanism 2 is also directly or indirectly connected to the seat cushion 200. The sliding mechanism 2 also has a first working state and a second working state.

[0058] Specifically, when the sliding mechanism 2 is in its first working state, the chair back 1 can move relative to the sliding mechanism 2 towards or away from the support frame 3 under the action of an external force, while the sliding mechanism 2 remains stationary relative to the support frame 3. This allows the chair back 1 to adjust its height relative to the support frame 3 in the vertical direction according to different body shapes. That is, before the user sits on the chair 1000, the user can manually adjust the height of the chair back 1 relative to the support frame 3 in the vertical direction. Figure 5 and Figure 6 As shown.

[0059] When the sliding mechanism 2 is in its second working state, the backrest 1, under the action of external force, can drive the sliding mechanism 2 to move closer to or away from the support frame 3. During the continuous adjustment of the user's sitting posture, the user's back will exert an external force on the backrest 1, causing the backrest 1 to drive the sliding mechanism 2 to move closer to or away from the support frame 3. This allows the backrest 1 to adjust its position relative to the support frame 3 according to different sitting postures, and ensures that the backrest 1 always supports and holds the user's back, which helps alleviate fatigue and injury to the back. Figure 3 , Figure 4 , Figures 7 to 10 As shown.

[0060] Please continue reading Figure 2 The chair back 1 includes a back cushion 11 and a mounting frame 12. The mounting frame 12 has a mounting cavity, the sliding mechanism 2 is housed in the mounting cavity, and at least a portion of the support frame 3 is inserted into the mounting cavity.

[0061] Specifically, the support frame 3 includes a first bracket 31 and a second bracket 32. The first bracket 31 extends horizontally, and one end of the first bracket 31 is directly or indirectly connected to the seat cushion 200. The second bracket 32 ​​extends vertically from the other end of the first bracket 31 away from the seat cushion 200 towards the backrest 1, so that the support frame 3 is approximately L-shaped. At least part of the second bracket 32 ​​away from the first bracket 31 is inserted into the mounting cavity.

[0062] By housing the sliding mechanism 2 within the mounting cavity, the back support device 100 can be designed in a compact manner. During the movement of the backrest 1 relative to the support frame 3, at least a portion of the support frame 3 remains inserted within the mounting cavity, preventing the backrest 1 from wobbling or falling off.

[0063] It should be noted that the mounting frame 12 may have a mounting cavity directly formed inside; or, the mounting frame 12 may have a receiving groove, and the chair back 1 may also include a cover plate (not shown in the figure) disposed on the mounting frame 12. The mounting frame 12 and the cover plate together enclose the mounting cavity to simplify the molding process of the mounting frame 12.

[0064] Please continue reading Figure 2 The sliding mechanism 2 includes a sliding component 21 and a locking component 22. The sliding component 21 is movably connected to the support frame 3, and the locking component 22 is movably connected to the mounting frame 12. The sliding mechanism 2 connects to or disconnects from the mounting frame 12 through the locking component 22.

[0065] Specifically, when the sliding mechanism 2 is in the first working state, the locking component 22 is disconnected from the mounting bracket 12 so that the chair back 1 can move relative to the sliding mechanism 2 while the sliding mechanism 2 remains stationary; when the sliding mechanism 2 is in the second working state, the locking component 22 is connected to the mounting bracket 12 so that the chair back 1 can drive the sliding mechanism 2 to move together.

[0066] In some embodiments, the sliding assembly 21 includes a sliding seat 211 and a first elastic member 212, the first elastic member 212 being connected between the sliding seat 211 and the support frame 3; the sliding seat 211 is provided with at least one sliding part (not shown in the figure), and the support frame 3 is provided with at least one mating part (not shown in the figure), and any sliding part and a mating part are movably connected.

[0067] Specifically, when the sliding mechanism 2 is in the second working state, the backrest 1 can drive the sliding seat 211 to move closer to or further away from the support frame 3 under the action of external force, so that the first elastic element 212 is in a compressed or stretched state and stores elastic potential energy. When the external force on the backrest 1 is released or reduced, the backrest 1 can return to a certain distance under the action of the elastic force of the first elastic element 212, thereby ensuring that the backrest 1 can adjust its position relative to the support frame 3 according to different sitting postures.

[0068] The first elastic element 212 can be any elastic component such as a spring, sheet spring, leaf spring, or rubber block, and is not limited thereto. In the embodiments of this application, the first elastic element 212 can be a spring.

[0069] In one feasible implementation, the sliding part includes a groove (not shown in the figure) extending in a vertical direction, and the mating part includes a guide rail (not shown in the figure) extending in a vertical direction, the guide rail being movably embedded in the groove.

[0070] In another feasible embodiment, the sliding part includes a guide rail (not shown in the figure) extending in a vertical direction, and the mating part includes a groove (not shown in the figure) extending in a vertical direction, with the guide rail movably embedded in the groove.

[0071] This cooperation between the slide rail and the guide rail ensures that the sliding seat 211 does not shift or wobble during movement, which facilitates the smooth movement of the chair back 1.

[0072] Specifically, there can be one or N slides, where N is a positive integer greater than 1. The number and position of the guide rails correspond one-to-one with the number and position of the slides, and there is no limitation here.

[0073] It is understandable that the sliding part and the mating part can each include a groove extending in the vertical direction and a guide rail extending in the vertical direction, respectively.

[0074] In another feasible embodiment, the sliding part includes a mounting hole (not shown in the figure) that passes through the sliding seat 211 in a vertical direction, and the mating part includes a guide post (not shown in the figure) provided on the support frame 3, and the guide post extends in a vertical direction, with at least a portion of the guide post inserted into the mounting hole.

[0075] This cooperation between the guide post and the mounting hole ensures that the sliding seat 211 does not shift or wobble during movement, which facilitates the smooth movement of the chair back 1.

[0076] Specifically, the number of mounting holes can be one or M, where M is a positive integer greater than 1. The number and position of the guide posts correspond one-to-one with the number and position of the mounting holes, and are not limited here.

[0077] Furthermore, a linear bearing can be installed inside the mounting hole, with the guide post inserted into the linear bearing, so that the friction between the sliding seat 211 and the support frame 3 can be reduced during the movement of the sliding seat 211 relative to the support frame 3.

[0078] It should be noted that the sliding part may include a mounting hole that passes through the sliding seat 211 in the vertical direction, or a groove and / or guide rail that extends in the vertical direction; correspondingly, the mating part may include a guide post provided on the support frame 3, or a groove and / or guide rail that extends in the vertical direction.

[0079] Furthermore, the sliding assembly 21 also includes at least one roller, which can be rotatably mounted on the sliding seat 211. The roller contacts the support frame 3, which helps to reduce the friction between the sliding seat 211 and the support frame 3, ensuring that the sliding seat 211 can move smoothly.

[0080] Specifically, the number of rollers can be one, two, three, four, or any other arbitrary number, and is not limited herein. In the embodiments of this application, the number of rollers can be four, and the four rollers are symmetrically arranged around the sliding seat 211.

[0081] It is understood that the rollers may also be rotatably mounted on the support frame 3, with the rollers contacting the slide seat 211; and / or, a portion of the rollers may be mounted on the slide seat 211, while another portion of the rollers may be mounted on the support frame 3, without limitation.

[0082] In some embodiments, the locking component 22 includes a positioning member 221 and a second elastic member 222, the second elastic member 222 being connected between the positioning member 221 and the sliding seat 211. The inner sidewall of the mounting bracket 12 is provided with a plurality of positioning grooves 13 in the vertical direction, at least a portion of the positioning member 221 being insertable into the positioning grooves 13.

[0083] Specifically, when the sliding mechanism 2 is in the first working state, the chair back 1 can move towards or away from the support frame 3 under the action of external force. During this process, the positioning member 221 can first fall out of one positioning groove 13, and then move to another positioning groove 13 under the action of the second elastic member 222. The height of the chair back 1 relative to the support frame 3 in the vertical direction is maintained by the cooperation between the positioning member 221 and the positioning groove 13.

[0084] The second elastic element 222 can be any other elastic component such as a spring, sheet spring, leaf spring, or rubber block, and is not limited thereto. In the embodiments of this application, the second elastic element 222 can be a sheet spring.

[0085] In one feasible implementation, the positioning member 221 includes a connecting portion 2211 and a plug portion 2212. The connecting portion 2211 extends in a vertical direction and is connected to the second elastic member 222. The plug portion 2212 extends from the surface of the connecting portion 2211 away from the sliding seat 211 toward the positioning groove 13.

[0086] Specifically, the positioning groove 13 is provided with a guide surface, which can be an arc surface or an inclined surface. When the sliding mechanism 2 is in the first working state, the chair back 1 can apply a certain force to the insertion part 2212 under the action of external force. The insertion part 2212 transmits the force to the connecting part 2211, so that the connecting part 2211 can drive the second elastic member 222 to undergo elastic deformation, thereby causing the insertion part 2212 to move along the guide surface, so that the insertion part 2212 moves away from the positioning groove 13 and falls out of the positioning groove 13, realizing the disconnection of the locking component 22 from the mounting bracket 12.

[0087] When the chair back 1 is moved into place, under the elastic force of the second elastic member 222, the connecting part 2211 can drive the insertion part 2212 to move along the guide surface, so that the insertion part 2212 moves towards the positioning groove 13 and is inserted into the positioning groove 13, thereby realizing the connection between the locking component 22 and the mounting bracket 12.

[0088] When the connector 2212 moves to the last positioning slot 13 near the seat cushion 200, the backrest 1 is at its highest height. If the user continues to apply an upward force to the backrest 1, the connector 2212 can detach from the last positioning slot 13. Under its own weight, the backrest 1 moves towards the support frame 3, and the connector 2212 can move to the first positioning slot 13 away from the seat cushion 200. At this time, the backrest 1 is at its lowest height, realizing the automatic reset of the backrest 1.

[0089] It should be noted that the connecting part 2211 can deflect in the front-to-back direction; and / or, the connecting part 2211 can also deflect in the left-to-right direction. The connecting part 2211 can be made of an elastic material without the need for an additional second elastic element 222.

[0090] In another feasible embodiment, the positioning groove 13 can be a spherical groove, and the shape of the positioning member 221 is adapted to the shape of the positioning groove 13, that is, the shape of the positioning member 221 is spherical, and at least a portion of the positioning member 221 is accommodated in the positioning groove 13.

[0091] Please see Figure 9 and Figure 10 In some embodiments, the seat 1000 further includes a position adjustment device 400 disposed between the seat cushion 200 and the chair leg 300. The position adjustment device 400 is used to adjust the height of the seat cushion 200 relative to the chair leg 300 and to adjust the angle of the backrest 1.

[0092] Specifically, the position adjustment device 400 includes a reclining adjustment mechanism 410 and a lifting mechanism 420. The reclining adjustment mechanism 410 is located at the bottom of the seat cushion 200 and is also connected to the backrest 1. The lifting mechanism 420 is located between the reclining adjustment mechanism 410 and the chair legs 300. When a user sits on the chair 1000, reclining can cause the reclining adjustment mechanism 410 to rotate the backrest 1 relative to the seat cushion 200 by a certain angle, allowing the backrest 1 to move backward with the user's back and always provide support. The lifting mechanism 420 can be any component that enables the seat cushion 200 to move up and down, such as a hydraulic telescopic rod, and is not limited here.

[0093] Understandably, before sitting on the seat 1000, the user can manually adjust the angle of the backrest 1 relative to the seat cushion 200. That is, the user can adjust the angle of the backrest 1 relative to the seat cushion 200 through the reclining adjustment mechanism 410 before sitting on the seat 1000.

[0094] It should be noted that the seat 1000 may not be equipped with the position adjustment device 400, that is, the seat 1000 does not have the functions of seat cushion height adjustment and backrest recline adjustment; or, the seat 1000 may only be equipped with the recline adjustment mechanism 410, without the lifting mechanism 420, that is, the seat 1000 has the function of backrest recline adjustment but not the function of seat cushion height adjustment; or, the seat 1000 may only be equipped with the lifting mechanism 420, without the recline adjustment mechanism 410, that is, the seat 1000 has the function of seat cushion height adjustment but not the function of backrest recline adjustment.

[0095] Furthermore, the chair leg 300 includes at least one support leg 310 and at least one swivel wheel 320. Each support leg 310 has a swivel wheel 320 at its bottom, allowing the user to move the position of the seat 1000 via the swivel wheel 320.

[0096] Specifically, the number of support feet 310 can be one, two, three, four, or any other arbitrary number, and the included angle formed by any two adjacent support feet 310 is the same. The number of steering wheels 320 is the same as the number of support feet 310, and this is not limited here. In this embodiment, the number of support feet 310 can be five, and the included angle formed between any two adjacent support feet 310 can be 72°.

[0097] It should be noted that the chair leg 300 may only include the support leg 310, that is, the bottom of the support leg 310 does not need to be equipped with the steering wheel 320, and the support leg 310 is in direct contact with the ground.

[0098] Please continue reading Figure 9 In some embodiments, the seat 1000 also includes an armrest 500, which is directly or indirectly connected to the seat cushion 200.

[0099] Specifically, the number of armrests 500 can be one or two, and is not limited here. In the embodiment of this application, the number of armrests 500 can be two, and the two armrests 500 are arranged on both sides of the seat cushion 200 in the left-right direction.

[0100] Furthermore, the armrest 500 can be connected to the seat cushion 200 via the reclining adjustment mechanism 410, so that the armrest 500 can rotate relative to the seat cushion 200 along with the backrest 1, so that the armrest 500 can always support the human arm.

[0101] It should be noted that the seat 1000 may not have armrests 500; or, the seat 1000 may have armrests 500, which are directly connected to the seat cushion 200, meaning that the armrests 500 cannot rotate with the backrest 1 relative to the seat cushion 200; or, the seat 1000 may have armrests 500, which are directly connected to the backrest 1, allowing the armrests 500 to rotate with the backrest 1 relative to the seat cushion 200.

[0102] Please continue reading Figure 9 In some embodiments, the seat 1000 also includes a headrest 600, which is disposed on the side of the backrest 1 away from the seat cushion 200. When a user sits on the seat 1000, the headrest 600 can be used to support the human head.

[0103] Furthermore, the seat 1000 also includes an adjustment device (not shown in the figure), which can be used to adjust the height and angle of the headrest 600 relative to the backrest 1, so that the headrest 600 can adapt to different body types and different sitting postures.

[0104] Specifically, before a user sits on the chair 1000, the user can adjust the height of the headrest 600 relative to the backrest 1 using the adjustment mechanism, allowing the headrest 600 to be adjusted to suit different body shapes. Once the user sits on the chair 1000, as the user's posture changes, the head exerts a certain force on the headrest 600, causing the adjustment mechanism to rotate the headrest 600 relative to the backrest 1, thus allowing the headrest 600 to adjust its angle relative to the backrest 1 according to different sitting postures. Furthermore, the headrest 600 can also move up or down relative to the seat cushion 200 along with the backrest 1, and can rotate forward or backward relative to the seat cushion 200 along with the backrest 1.

[0105] It should be noted that the seat 1000 may not be equipped with a headrest 600 and an adjustment device; or, the seat 1000 may only be equipped with a headrest 600 without an adjustment device; or, the seat 1000 may be equipped with both a headrest 600 and an adjustment device, and the adjustment device may only be used to adjust the height or angle of the headrest 600 relative to the backrest 1.

[0106] Compared with the prior art, in the back support device 100 and seat 1000 provided in the embodiments of this application, when the sliding mechanism 2 is in the first working state, the backrest 1 can move towards or away from the support frame 3 under the action of external force, while the sliding mechanism 2 remains stationary relative to the support frame 3, so that the backrest 1 can adjust its height relative to the support frame 3 in the vertical direction according to different body shapes; when the sliding mechanism 2 is in the second working state, during the process of continuous adjustment of the human sitting posture, the human back will apply external force to the backrest 1, so that the backrest 1 can drive the sliding mechanism 2 to move towards or away from the support frame 3 together under the action of external force, so that the backrest 1 can adjust its position relative to the support frame 3 according to different sitting postures, and the backrest 1 can always support and hold the human back, which is beneficial to relieving fatigue and injury to the human back.

[0107] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A back support device, characterized by The chair includes a backrest, a support frame, and a sliding mechanism. The backrest is movably connected to the sliding mechanism, and the sliding mechanism is also movably connected to the support frame. The sliding mechanism has a first working state and a second working state. The chair back includes a back cushion and a mounting frame. The mounting frame has a mounting cavity, the sliding mechanism is housed in the mounting cavity, and at least a portion of the support frame is inserted into the mounting cavity. The sliding mechanism includes a sliding component and a locking component. The sliding component is movably connected to the support frame, and the locking component is movably connected to the mounting frame. The sliding assembly includes a sliding seat and a first elastic element, wherein the first elastic element is connected between the sliding seat and the support frame; The locking component includes a positioning element and a second elastic element, the second elastic element being connected between the positioning element and the sliding seat; The inner sidewall of the mounting bracket is provided with a plurality of positioning grooves in the vertical direction, and at least a portion of the positioning member can be inserted into the positioning grooves; When the sliding mechanism is in the first working state, the locking component is disconnected from the mounting frame, so that the chair back can move relative to the sliding mechanism toward or away from the support frame. When the sliding mechanism is in the second working state, the locking component is connected to the mounting bracket so that the chair back can drive the sliding mechanism to move towards or away from the support bracket.

2. The back support device of claim 1, wherein The sliding seat is provided with at least one sliding part, and the support frame is provided with at least one mating part, wherein any one of the sliding parts and one of the mating parts are movably connected.

3. The back support device of claim 2, wherein The sliding part includes a groove extending in a vertical direction, and the mating part includes a guide rail extending in the vertical direction, the guide rail being movably embedded in the groove; And / or, the sliding part includes a guide rail extending along the vertical direction, and the mating part includes a groove extending along the vertical direction, the guide rail being movably fitted into the groove.

4. The back support device according to claim 2 or 3, characterized in that, The sliding part includes a mounting hole that passes through the sliding seat in a vertical direction, and the mating part includes a guide post disposed on the support frame, and the guide post extends in the vertical direction, with at least a portion of the guide post inserted into the mounting hole.

5. The back support device of claim 1, wherein The sliding assembly further includes at least one roller, which is rotatably disposed on the sliding seat and contacts the support frame; And / or, the sliding assembly further includes at least one roller rotatably disposed on the support frame, the roller contacting the sliding seat.

6. The back support device of claim 1, wherein The positioning member includes a connecting portion and a plug-in portion. The connecting portion extends along the vertical direction and is connected to the second elastic member. The plug-in portion extends from the surface of the connecting portion away from the sliding seat towards the positioning groove.

7. A seat, characterized by Includes the back support device as described in any one of claims 1-6.

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