Chair back and seat

Abstract

The utility model discloses a chair back and a seat. The chair back comprises a back beam, a front frame, a middle part, a first adjusting assembly and a second adjusting assembly, the first adjusting assembly comprises a first elastic piece, and elastic force of the first elastic piece is used for driving the front frame to reset. The second adjusting assembly comprises a gear strip and a sliding block, and the middle part is connected to the back beam in a sliding mode. The chair back is arranged to be of a three-layer structure, the first adjusting assembly and the second adjusting assembly are arranged in the two adjacent layers respectively, the first adjusting assembly is of a passive adjusting structure designed on the basis of a traditional structure, and a user can adjust the approximate height of the chair back according to the height of the user before using the chair back; in the actual use process, when a user leans on the chair back and applies extrusion force, the component force of the extrusion force in the vertical direction can be shared by the first adjusting assembly, so that the front frame slides in the vertical direction relative to the middle part, the back rubbing feeling is reduced, and the use experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of seat manufacturing technology, specifically to a chair back and a seat. Background Technology

[0002] Office chairs are a type of equipment used daily, and the chair back is a key factor affecting the comfort of the chair. In order to improve user comfort, existing technologies have chosen to set the chair back to be height-adjustable to accommodate users of different heights and obtain a better user experience. However, existing height-adjustable chair backs still have the problem of poor user experience. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a chair back that can be height-adjusted while improving the user experience.

[0004] This utility model also proposes a seat having the aforementioned backrest.

[0005] A chair back according to a first aspect of the present invention includes a back beam, a front frame, a middle portion, a first adjustment assembly, and a second adjustment assembly. The middle portion is mounted between the back beam and the front frame in a front-to-back direction. The first adjustment assembly is mounted between the middle portion and the front frame, and includes a first elastic member. When the front frame slides relative to the middle portion in a vertical direction, the first elastic member deforms, and the elastic force of the first elastic member drives the front frame to return to its original position. The second adjustment assembly is mounted between the middle portion and the back beam, and includes a stop bar and a slider. The stop bar includes a plurality of stop grooves spaced apart in a vertical direction. The middle portion is slidably connected to the back beam. When the slider is located in any of the stop grooves, the second adjustment assembly restricts the middle portion from sliding relative to the back beam.

[0006] The chair back according to the present invention has at least the following beneficial effects: In the prior art, chair back adjustment can usually only actively adjust the height, and the height is fixed after adjustment. Although this can meet the needs of users of different heights, in actual use, users will lean against the chair back and apply a certain degree of pressure to it. When the force is not completely perpendicular to the chair back, but is relatively inclined, there will be a vertical component force that causes the user's back and the chair back to tend to move relative to each other. Since the height of the chair back is fixed after adjustment, friction will be generated, resulting in a slight back-rubbing sensation, or the clothes will stick to the chair back, and the back will move up and down, creating a rubbing sensation. All of these will reduce the user's experience, and no matter how the chair back height is adjusted, such a feeling will occur during use. The chair back of this utility model embodiment is designed with a three-layer structure, and a first adjustment component and a second adjustment component are respectively arranged in two adjacent layers. The second adjustment component is a traditional height adjustment component, while the first adjustment component is designed with a passive adjustment structure. Before use, the user can adjust the approximate height of the chair back according to their own height. In actual use, when the user leans against the chair back and applies pressure, the vertical component of the pressure is distributed to the first adjustment component, causing the front frame to slide vertically relative to the middle part, thereby reducing the aforementioned back-rubbing sensation and improving the user experience. Furthermore, when the user removes the chair back, the first elastic element in the first adjustment component can also drive the front frame to return to its original position relative to the middle part, thus facilitating the next use.

[0007] According to some embodiments of this utility model, the gear shift bar is disposed on the back beam, and the slider is disposed on the middle part. The gear shift bar includes a lowest gear, a middle gear, and a highest gear, spaced apart from bottom to top. The slider can be driven by a first external force to slide from the lowest gear to the middle gear. The slider can be driven by a second external force to slide from the middle gear to the highest gear. The slider can be driven by a third external force to slide out from the highest gear, and the gravity of the front frame and the middle part drives the slider back from the highest gear to the lowest gear. The first external force, the second external force, and the third external force are all in an upward direction.

[0008] According to some embodiments of the present invention, the slider includes a body and a protrusion, and the backrest further includes a second elastic member. The body is rotatably mounted on the middle part, and the protrusion is connected to the end of the body away from the middle part. The protrusion is used to slide within the gear bar. The two ends of the second elastic member abut against the inner walls of the body and the middle part, respectively. When the protrusion slides within the gear bar, the elastic force of the second elastic member is used to drive the slider to reset.

[0009] According to some embodiments of the present invention, each of the plurality of gear slots forms a plurality of intermediate gears, each intermediate gear having a first opening that is inclined upwards, and the slider can be driven by the second external force to slide from bottom to top to the plurality of first openings. When the slider slides to the first opening and the second external force is removed, the gravity of the middle part and the front frame drives the slider to slide from the first opening into the intermediate gear.

[0010] According to some embodiments of the present invention, the first adjustment component includes a first limiting block, and the middle part is provided with a first limiting groove in the vertical direction. The first limiting block is installed on the front frame and slidably disposed in the first limiting groove. When the front frame is in the initial state relative to the middle part, the first limiting block is located at the top of the first limiting groove.

[0011] According to some embodiments of the present invention, the second adjustment component includes a second limiting block, the back beam has a second limiting groove in the vertical direction, the second limiting block is installed in the middle part and slidably disposed in the second limiting groove, and when the slider is located below the gear bar, the second limiting block is located at the bottom end of the second limiting groove.

[0012] According to some embodiments of the present invention, the chair back includes a switch assembly disposed between the front frame and the middle portion. The switch assembly has an open state and a locked state. When the switch assembly is in the open state, the front frame can slide relative to the middle portion. When the switch assembly is in the locked state, the position of the front frame relative to the middle portion is fixed.

[0013] According to some embodiments of this utility model, the switch assembly includes an active member, a driven member, and a third elastic member. The active member and the driven member are rotatably mounted on the front frame. The two ends of the third elastic member abut against the active member and the driven member, respectively, and a groove is formed in the middle portion facing the front frame. When the active member abuts against the driven member, a portion of the driven member engages in the groove to lock the switch assembly. When the active member disengages from the driven member, the elastic force of the third elastic member drives the driven member out of the groove, thereby opening the switch assembly.

[0014] A seat according to a second aspect of the present invention includes a base and a backrest as described in any one of the first aspect embodiments, wherein the backrest is mounted on the base.

[0015] The seat according to the second aspect of the present invention has at least the following beneficial effects: The backrest of the present invention is configured as a three-layer structure, with a first adjustment component and a second adjustment component respectively arranged in two adjacent layers. The second adjustment component is a traditional height adjustment component, while the first adjustment component is designed with a passive adjustment structure. Before use, the user can adjust the approximate height of the backrest according to their own height. In actual use, when the user leans against the backrest and applies pressure, the vertical component of the pressure is distributed to the first adjustment component, causing the front frame to slide vertically relative to the middle part, thereby reducing the aforementioned back-rubbing sensation and improving the user experience. Furthermore, when the user removes the backrest, the first elastic element in the first adjustment component can also drive the front frame to return to its original position relative to the middle part, thus facilitating the next use. The seat using this backrest can effectively improve the user experience.

[0016] According to some embodiments of the present invention, the chair back can rotate rearward relative to the base, and the angle between the chair back and the base is α, where 90°≤α≤135°.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a partial perspective view of the seat in one embodiment of the present utility model;

[0020] Figure 2 This is an exploded view of the chair back in one embodiment of the present invention;

[0021] Figure 3 This is a rear view of the chair back in one embodiment of the present invention;

[0022] Figure 4 for Figure 3 Sectional view of section line AA in the middle;

[0023] Figure 5 for Figure 3 Sectional view of the BB section line;

[0024] Figure 6 for Figure 5 Enlarged view of region C in the middle;

[0025] Figure 7 This is an exploded view of the back beam and switch assembly in one embodiment of the present invention;

[0026] Figure 8 This is a front view of the back beam in one embodiment of the present invention;

[0027] Figure 9 for Figure 8 Enlarged view of region D in the middle;

[0028] Figure 10 This is a partial side view of the seat in one embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the initial state of the chair back in one embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram showing the middle part of the chair back rising relative to the back beam in one embodiment of the present invention.

[0031] Figure 13 This is a schematic diagram of the front frame of the chair back sliding down relative to the middle part in one embodiment of the present invention.

[0032] Reference numerals: Seat 100, Backrest 101, Base 102, Backbeam 201, Front Frame 202, Middle Part 203, First Adjustment Component 204, First Elastic Member 205, Switch Component 206, Second Adjustment Component 207, Slider 208, Gear Bar 209, Pulley 210, Second Limiting Groove 301, Second Limiting Block 302, First Limiting Block 401, First Limiting Groove 402, Driving Member 601, Driven Member 602, Groove 603, Third Elastic Member 701, Gear Groove 901, First Opening 902, Lowest Gear 903, Middle Gear 904, Highest Gear 905, Body Part 906, Protrusion 907, Second Elastic Member 908, Second Opening 909, Blocking Part 910. Detailed Implementation

[0033] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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.

[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. 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.

[0038] In existing technologies, the backrest 101 adjustment can typically only actively adjust the height, and once adjusted, the height is fixed. While this can meet the needs of users of different heights, in actual use, users lean against the backrest 101 and apply a certain degree of pressure. When the force is not completely perpendicular to the backrest 101 but is relatively tilted, there will be a vertical component force that causes the user's back and the backrest 101 to tend to move relative to each other. Since the height of the backrest 101 remains unchanged after adjustment, friction will be generated, resulting in a slight rubbing sensation on the back. Alternatively, if clothing is pressed against the backrest 101 and the back moves up and down, it may feel like the clothing is being rubbed. All of these factors reduce the user's experience, and this feeling will occur regardless of how the backrest 101 is adjusted.

[0039] refer to Figure 2 , Figure 3 , Figures 11 to 13According to a first aspect embodiment of the present invention, a chair back 101 includes a back beam 201, a front frame 202, a middle portion 203, a first adjustment component 204, and a second adjustment component 207. The middle portion 203 is installed between the back beam 201 and the front frame 202 in a front-rear direction. The first adjustment component 204 is installed between the middle portion 203 and the front frame 202. The first adjustment component 204 includes a first elastic member 205. When the front frame 202 slides relative to the middle portion 203 in a vertical direction, the first elastic member 205 deforms, and the elastic force of the first elastic member 205 is used to drive the front frame 202 to return to its original position. The second adjustment component 207 is installed between the middle part 203 and the back beam 201. The second adjustment component 207 includes a shift bar 209 and a slider 208. The shift bar 209 includes a plurality of shift grooves 901 distributed at intervals along the vertical direction. The middle part 203 is slidably connected to the back beam 201. When the slider 208 is located in any shift groove 901, the second adjustment component 207 restricts the middle part 203 from sliding relative to the back beam 201.

[0040] The chair back 101 of this utility model embodiment is configured as a three-layer structure, with a first adjustment component 204 and a second adjustment component 207 respectively arranged in two adjacent layers. The second adjustment component 207 is a traditional height adjustment component, while the first adjustment component 204 is designed with a passive adjustment structure. Before use, the user can adjust the approximate height of the chair back 101 according to their own height. In actual use, when the user leans against the chair back 101 and applies pressure, the vertical component of the pressure is distributed to the first adjustment component 204, causing the front frame 202 to slide vertically relative to the middle part 203, thereby reducing the aforementioned back-rubbing sensation and improving the user experience. Furthermore, when the user removes the chair back 101, the first elastic element 205 in the first adjustment component 204 can also drive the front frame 202 to return to its original position relative to the middle part 203, thus facilitating the next use.

[0041] It should be noted that the reference Figure 2 In some embodiments of this utility model, the first elastic element 205 is a spring, and two are arranged side by side, which can further enhance the elastic force of the reset to resist the weight of the front frame 202 itself.

[0042] It should be noted that the above-mentioned reset refers to the front frame 202 returning to its original position relative to the middle part 203 under the rebound force of the first elastic element 205 without any other external force. Figure 11The initial state shown is the state of the chair back 101 before use. During use, the second adjustment component 207 can be manually adjusted, or the user can passively lean against the chair back 101 so that the first adjustment component 204 adaptively adjusts the position of the front frame 202, effectively improving the comfort of the chair back 101. The comfort is specifically reflected in the fit between the back and the front frame 202 and the reduction of dynamic friction between the two, thereby reducing the feeling of jerk on the back and improving the user experience.

[0043] It should be noted that in some embodiments of this utility model, the chair back 101 can also be configured as a four-layer or multi-layer structure, with the first adjustment component 204 and the second adjustment component 207 mentioned in this utility model, or other transmission structures, between adjacent layers, thereby achieving the technical effect of adjusting the chair back 100+ layers.

[0044] refer to Figure 2 , Figures 7 to 9 In some embodiments of this utility model, a gear shift bar 209 is disposed on the back beam 201, and a slider 208 is disposed on the middle part 203. The gear shift bar 209 includes a lowest gear 903, a middle gear 904, and a highest gear 905 distributed from bottom to top. The slider 208 can be driven by a first external force to slide from the lowest gear 903 to the middle gear 904. The slider 208 can be driven by a second external force to slide from the middle gear 904 to the highest gear 905. The slider 208 can be driven by a third external force to slide out from the highest gear 905. The gravity of the front frame 202 and the middle part 203 drives the slider 208 back from the highest gear 905 to the lowest gear 903. The first external force, the second external force, and the third external force are all in an upward direction. This allows for initial adjustment of the chair back 101 height. Higher users can lift the front frame 202 upwards, causing the middle part 203 and the slider 208 installed on the middle part 203 to slide upwards together. This allows the slider 208 to be adjusted between the lowest setting 903, the middle setting 904, and the highest setting 905. After the external force is removed, the slider 208 is fixed in the gear slot 901. Furthermore, gear adjustment does not require additional operating parts; only an upward force needs to be applied to the front frame 202. The operating logic is more intuitive, and the operation process is more convenient.

[0045] refer to Figure 8 and Figure 9In some embodiments of this utility model, the slider 208 includes a body portion 906 and a protrusion 907, and the backrest 101 also includes a second elastic member 908. The body portion 906 is rotatably mounted on the intermediate portion 203, and the protrusion 907 is connected to the end of the body portion 906 away from the intermediate portion 203. The protrusion 907 is used to slide within the shift bar 209. The two ends of the second elastic member 908 respectively abut against the inner walls of the body portion 906 and the intermediate portion 203. When the protrusion 907 slides within the shift bar 209, the elastic force of the second elastic member 908 is used to drive the slider 208 to reset. (Reference) Figure 2 and Figure 9 The main body 906 is rotatably mounted on the intermediate part 203. When the main body 906 rotates, it can drive the distal protrusion 907 to swing. Therefore, when the slider 208 moves upward as a whole and the protrusion 907 disengages from the outer peripheral surface of the stop bar 209, the elastic force of the second elastic member 908 will drive the main body 906 to rotate, thereby causing the protrusion 907 to swing. In this embodiment of the present invention, "resetting" refers to causing the protrusion 907 to swing to the left. Figure 9 As shown in the figure, the protrusion 907 can be swung into the gear slot 901 to achieve gear shifting, and in operation, it can be moved upwards.

[0046] It should be noted that in some embodiments of this utility model, the second elastic element 908 is a torsion spring, which can better fit between the main body 906 and the middle part 203 and maintain the technical effect of fixing the angle of the protrusion 907.

[0047] refer to Figure 9 In some embodiments of this utility model, multiple gear slots 901 each form multiple intermediate gears 904. Each intermediate gear 904 has a first opening 902 that is inclined upwards. A slider 208 can be driven by a second external force to slide upwards to the multiple first openings 902. When the slider 208 slides to the first opening 902 and the second external force is removed, the gravity of the middle portion 203 and the front frame 202 drives the slider 208 to slide from the first opening 902 into the intermediate gear 904. It should be noted that, referring to... Figure 9 The gear slots 901 between the lowest gear 903 and the highest gear 905 are all intermediate gears 904. This design allows the protrusion 907 of the slider 208 to swing to the left under the elastic force of the second elastic member 908 when it slides to the first opening 902. Since there is no obstruction from the outer wall of the gear bar 209 on the left side, the protrusion 907 enters the gear slot 901 through the first opening 902 under the elastic force of the second elastic member 908. After the external force is removed, it is engaged with the current gear under the action of gravity to achieve gear shifting. The upward tilt of the intermediate gear 904 makes it easy for the protrusion 907 to slide smoothly up along the side wall of the intermediate gear 904 during the process of continuing to shift gears, thereby disengaging from the current gear and smoothly entering and fixing in the next gear.

[0048] refer to Figure 9 In some embodiments of this utility model, the uppermost gear slot 901 forms the highest gear 905. The highest gear 905 has a second opening 909 that faces completely upward. When the protrusion 907 is pushed upward to the highest position by an external force, it is located above the second opening 909. When the external force is removed, the protrusion 907 falls into the highest gear 905 under the action of gravity to realize gear switching. Under the elastic force of the second elastic member 908, it swings to the leftmost position. When it is necessary to switch from the highest gear 905 to the lowest gear 903, the front frame 202 and the middle part 203 are pushed upward to make the protrusion 907 rise. After the protrusion 907 is separated from the second opening 909, it will swing to the left under the action of the second elastic member 908. When the external force is removed, the protrusion 907 will slide down along the left side wall of the gear bar 209 to the lowest gear 903.

[0049] refer to Figure 9 In some embodiments of this utility model, a blocking part 910 is also provided above the second opening 909. The blocking part 910 extends vertically downward and is located in the middle part 203 of the second opening 909. This ensures that the protrusion 907 can disengage from the highest gear 905 from the left side and slide down along the left side wall to the lowest gear 903, thus avoiding the blocking part 910 from disengaging from the right side and improving the stability of the gear shifting process.

[0050] In some embodiments of this utility model, it may not be designed as a unidirectional adjustment. Instead, a pin and a gear bar 209 with multiple through holes may be designed. After the pin is pulled out, the relative position between the middle part 203 and the back beam 201 is adjusted. After reaching the target gear, the pin is inserted into the through hole and passes through the back beam 201 and the middle part 203 to achieve gear switching. In this way, the gear adjustment of the second adjustment component 207 can be controlled at any position.

[0051] In some embodiments of this utility model, the one-way gear adjustment can also be configured in other forms, such as by setting multiple one-way pins and setting elastic elements such as springs in the one-way pins. When the protrusion 907 slides upward, the one-way pin is pressed, so that the protrusion 907 passes smoothly. After the protrusion 907 disengages from the one-way pin, the one-way pin is reset under the action of elasticity, thereby preventing the protrusion 907 from falling and realizing gear switching until the protrusion 907 slides to the highest point and disengages from the gear bar 209, and then returns to the lowest gear 903 under the action of gravity, thereby realizing a new round of gear adjustment.

[0052] refer to Figure 3 , Figure 4 , Figure 7 , Figures 11 to 13In some embodiments of this utility model, the first adjustment component 204 includes a first limiting block 401, and the middle part 203 is provided with a first limiting groove 402 in the vertical direction. The first limiting block 401 is installed on the front frame 202 and slidably disposed in the first limiting groove 402. When the front frame 202 is in the initial state relative to the middle part 203, the first limiting block 401 is located at the top of the first limiting groove 402. Figure 11 The state shown is the initial state. Figure 13 The state shown is the state when the front frame 202 is sliding down. This design is because in actual use, the user's back will tend to slide down when leaning against the backrest 101. Therefore, the adaptive first adjustment component 204 is set to the highest position at the beginning to adapt to the user's downward trend and to achieve the maximum travel within a limited space.

[0053] refer to Figure 3 , Figure 4 , Figure 7 , Figures 11 to 13 In some embodiments of this utility model, the second adjustment component 207 includes a second limiting block 302. The back beam 201 is provided with a second limiting groove 301 in the vertical direction. The second limiting block 302 is installed in the middle part 203 and slidably disposed in the second limiting groove 301. When the slider 208 is located below the stop bar 209, the second limiting block 302 is located at the bottom end of the second limiting groove 301. Figure 11 This represents the lowest state of the middle section 203 relative to the back beam 201. Figure 12 The design of the middle section 203 after sliding upward relative to the backrest 201 has several advantages. Firstly, it defaults to the lowest position and can then automatically adjust to the most common usage logic, aligning with user logic. Furthermore, gradual adjustment utilizes gravity to automatically lock into each position. Conversely, a separate structure for automatically fixing the position would be required, making the internal structure of the backrest 101 more complex. Secondly, since the first adjustment component 204 is already at its highest initial position, designing the second adjustment position in the opposite way facilitates the independent operation of both adjustment components. For example, if the second adjustment component 207 is also at its highest default position… The highest position is selected, and the front frame 202 needs to be pressed to adjust the position downwards. During this process, the first adjustment component 204 is also triggered by the pressure on the front frame 202, causing the front frame 202 to slide downwards relative to the middle part 203. That is, both adjustment components start to move, which is inconvenient for individual adjustment. Moreover, this design may also cause the second adjustment component 207 to adjust the position when the user leans against the backrest 101, in addition to the first adjustment component 204 causing the front frame 202 to slide downwards. That is, the middle part 203 may also slide downwards relative to the back beam 201, which reduces the user experience.

[0054] Furthermore, in some embodiments, reference is made to... Figure 2 and Figure 7 Multiple sets of pulleys 210 are provided between the front frame 202 and the middle part 203, and between the middle part 203 and the back beam 201. This makes the relative sliding between the three parts smoother, reduces friction between the parts, and improves service life.

[0055] Further, refer to Figure 3 and Figure 4 In some embodiments of this utility model, two sets of first limiting grooves 402 and second limiting grooves 301 are provided. The first limiting groove 402 and the second limiting groove 301 located at the top are connected end to end in the vertical direction. The sliding range of the first limiting groove 402 plus the sliding range of the second limiting groove 301 determines the maximum adjustment range of the chair back 101. Therefore, by setting the two limiting grooves end to end, the adjustment range of the chair back 101 can be maximized without increasing the overall size of the chair back 101.

[0056] It should be noted that in some embodiments of this utility model, the design of the first adjustment component 204 being at the highest position by default and the second adjustment component 207 being at the lowest position by default is a preferred solution rather than a mandatory solution. The two can be interchanged or set to the same adjustment direction, and can be designed according to the actual use scenario.

[0057] refer to Figure 3 , Figures 5 to 7 In some embodiments of this utility model, the chair back 101 includes a switch assembly 206, which is disposed between the front frame 202 and the middle portion 203. The switch assembly 206 has an open state and a locked state. When the switch assembly 206 is in the open state, the front frame 202 can slide relative to the middle portion 203. When the switch assembly 206 is in the locked state, the position of the front frame 202 relative to the middle portion 203 is fixed. The switch assembly 206 can further enhance the versatility of operation, so that the adaptive adjustment first adjustment assembly 204 also has an opening and closing function. When the switch assembly 206 is in the locked state, the function of the first adjustment assembly 204 is turned off, thereby meeting the needs of some users who do not require the adaptive sliding function of the front frame 202.

[0058] refer to Figures 5 to 7In some embodiments of this utility model, the switch assembly 206 includes an active member 601, a driven member 602, and a third elastic member 701. The active member 601 and the driven member 602 are rotatably mounted on the front frame 202. The two ends of the third elastic member 701 abut against the active member 601 and the driven member 602, respectively, and a groove 603 is formed on the side of the middle portion 203 facing the front frame 202. When the active member 601 abuts against the driven member 602, a portion of the driven member 602 is engaged in the groove 603 to lock the switch assembly 206. When the active member 601 and the driven member 602 disengage, the elastic force of the third elastic member 701 drives the driven member 602 to disengage from the groove 603, thereby opening the switch assembly 206. Figure 6 The state shown is that the active member 601 abuts against the driven member 602, causing it to partially engage in the groove 603. At this time, because the lower surface of the driven member 602 abuts against the bottom wall of the groove 603, the front frame 202 can no longer slide downward relative to the middle part 203, thus achieving the locking function. When unlocking is required, the front end of the active member 601 is pushed downward, and the part of the active member 601 that abuts against the driven member 602 rotates upward to disengage from the driven member 602. The lower end of the driven member 602 swings to the left under the elastic force of the third elastic member 701, thus disengaging from the groove 603. The front frame 202 can then slide downward relative to the middle part 203, thus achieving the opening function.

[0059] It should be noted that the reference Figure 6 In some embodiments of this utility model, the rear end of the active member 601 and the lower end of the driven member 602 are both provided with concave-convex structures, and at least one of them is elastic, thereby achieving damped contact. The damping force is greater than the elastic force of the third elastic member 701, so that the driven member 602 can be maintained in a position where... Figure 6 The damping effect during unlocking helps prevent accidental touches and improves the feel.

[0060] Further, refer to Figure 6 When the active component 601 is locked, its front end is tilted upwards. To unlock it, it needs to be pressed downwards so that the rear end of the active component 601 can disengage from the driven component 602. This design is more in line with the logic of the first adjustment component 204 of this utility model. Since the first adjustment component 204 of this utility model slides downwards, the switch component 206 applies downward force to unlock and upward force to lock, which matches the sliding trajectory of the front frame 202 after unlocking.

[0061] Further, refer to Figure 6 In some embodiments of this utility model, the front frame 202 has a through hole at the corresponding position of the active member 601, and the active member 601 extends outward relative to the front surface of the front frame 202, thus making it easier and more intuitive for the user to move the active member 601. (See reference...) Figure 11The through hole in the front frame 202 can be set at the top and in the center, which can improve the aesthetics, avoid the outer ring of the front frame 202, and make it easier for users to operate.

[0062] refer to Figure 1 and Figure 10 According to a second aspect embodiment of the present invention, the seat 100 includes a base 102 and a backrest 101 of any one of the first aspect embodiments, the backrest 101 being mounted on the base 102. The chair back 101 of this utility model embodiment is configured as a three-layer structure, with a first adjustment component 204 and a second adjustment component 207 respectively arranged in two adjacent layers. The second adjustment component 207 is a traditional height adjustment component, while the first adjustment component 204 is designed with a passive adjustment structure. Before use, the user can adjust the approximate height of the chair back 101 according to their own height. In actual use, when the user leans against the chair back 101 and applies pressure, the vertical component of the pressure is distributed to the first adjustment component 204, causing the front frame 202 to slide vertically relative to the middle part 203, thereby reducing the aforementioned back-rubbing sensation and improving the user experience. Furthermore, when the user removes the chair back 101, the first elastic element 205 in the first adjustment component 204 can also drive the front frame 202 to return to its original position relative to the middle part 203, thus facilitating the next use. The chair 100 using the chair back 101 can effectively improve the user experience.

[0063] refer to Figure 1 and Figure 10 In some embodiments of this utility model, the chair back 101 can rotate rearward relative to the base 102, and the angle between the chair back 101 and the base 102 is α, where 90°≤α≤135°. It should be noted that, referring to... Figure 10The included angle α specifically refers to the angle between the upper surface of the base 102 and the flat front surface of the front frame 202. The design of the backrest 101 being able to slide relative to the base 102 can work with the first adjustment component 204 of this utility model to make its adaptive sliding function easier to achieve. When the user leans back, the backrest 101 rotates backward, so that the user's back is more closely fitted to the front frame 202, and the internal stress generated by compression is simultaneously distributed on the rotation of the backrest 101 and the sliding part of the front frame 202, thereby reducing the discomfort caused by dynamic friction, and allowing the front frame 202 to rotate and slide with the user's leaning, improving the user experience. Furthermore, controlling the rotation angle between 90° and 135° is to obtain a better user experience. Specifically, α can be 90°, 110°, 120°, 135°, etc. When the angle is less than 90°, the backrest 101 is tilted forward relative to the base 102, resulting in poor support. Also, the front frame 202 is not easy to slide due to downward pressure. When the angle is greater than 135°, the angle of the backrest 101 relative to the base 102 is too large, and the seat 100 is prone to tipping over, resulting in low safety.

[0064] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A chair back, characterized in that, include: Back beam; Front frame; The middle section is installed between the back beam and the front frame in the front-rear direction; A first adjustment component is installed between the middle part and the front frame. The first adjustment component includes a first elastic element. When the front frame slides vertically relative to the middle part, the first elastic element deforms, and the elastic force of the first elastic element is used to drive the front frame to return to its original position. The second adjustment component is installed between the middle part and the back beam. The second adjustment component includes a shift bar and a slider. The shift bar includes a plurality of shift slots spaced apart in the vertical direction. The middle part is slidably connected to the back beam. When the slider is located in any of the shift slots, the second adjustment component restricts the middle part from sliding relative to the back beam.

2. The chair back according to claim 1, characterized in that, The gear bar is disposed on the back beam, the slider is disposed in the middle part, the gear bar includes the lowest gear, the middle gear and the highest gear distributed from bottom to top, and the slider can be driven by a first external force to slide from the lowest gear to the middle gear. The slider can be driven by a second external force to slide from the intermediate position to the highest position; The slider can be driven by a third external force to slide out from the highest gear, and the gravity of the front frame and the middle part drives the slider back from the highest gear to the lowest gear. The first external force, the second external force, and the third external force are all in the upward direction.

3. The chair back according to claim 2, characterized in that, The slider includes a body and a protrusion. The chair back also includes a second elastic member. The body is rotatably mounted on the middle part. The protrusion is connected to the end of the body away from the middle part. The protrusion is used to slide within the gear bar. The two ends of the second elastic member abut against the inner walls of the body and the middle part, respectively. When the protrusion slides within the gear bar, the elastic force of the second elastic member is used to drive the slider to reset.

4. The chair back according to claim 3, characterized in that, Each of the multiple gear slots forms a multiple intermediate gear, and each intermediate gear has a first opening that is inclined upward. The slider can be driven by the second external force to slide from bottom to top to the multiple first openings. When the slider slides to the first opening and the second external force is removed, the gravity of the middle part and the front frame drives the slider to slide from the first opening into the intermediate gear.

5. The chair back according to claim 1, characterized in that, The first adjustment component includes a first limiting block, and the middle part has a first limiting groove in the vertical direction. The first limiting block is installed on the front frame and slidably disposed in the first limiting groove. When the front frame is in the initial state relative to the middle part, the first limiting block is located at the top of the first limiting groove.

6. The chair back according to claim 1, characterized in that, The second adjustment component includes a second limiting block. The back beam has a second limiting groove in the vertical direction. The second limiting block is installed in the middle part and slidably disposed in the second limiting groove. When the slider is located below the gear bar, the second limiting block is located at the bottom end of the second limiting groove.

7. The chair back according to claim 1, characterized in that, The chair back includes a switch assembly disposed between the front frame and the middle portion. The switch assembly has an open state and a locked state. When the switch assembly is in the open state, the front frame can slide relative to the middle portion. When the switch assembly is in the locked state, the position of the front frame relative to the middle portion is fixed.

8. The chair back according to claim 7, characterized in that, The switch assembly includes an active member, a driven member, and a third elastic member. The active member and the driven member are rotatably mounted on the front frame. The two ends of the third elastic member abut against the active member and the driven member, respectively. A groove is provided on the middle part facing the front frame. When the driving member abuts against the driven member, a portion of the driven member engages within the groove to place the switch assembly in the locked state. When the driving member disengages from the driven member, the elastic force of the third elastic member drives the driven member out of the groove to place the switch assembly in the open state.

9. A seat, characterized in that, include: The chair back as described in any one of claims 1 to 8; The base, on which the chair back is mounted.

10. The seat according to claim 9, characterized in that, The chair back can rotate backward relative to the base, and the angle between the chair back and the base is α, where 90°≤α≤135°.

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