An adjustable seat back and seat

Abstract

This invention discloses an adjustable seat back and seat, belonging to the field of seat technology. The seat structurally includes a seat, legs, backrest, and armrests. An adjustable backrest support and backrest body are connected by a backrest lifting and adjusting mechanism. The lifting mechanism includes a guide groove, a slide, a rack and pinion multi-positioning assembly, a spring-adaptive floating structure, and a control switch. The slide is divided into an upper slide and a lower slide. The backrest is raised and locked along the guide groove by a slider, and the backrest adaptively floats up and down by a slider, guide groove, and spring. An eccentric transmission control switch allows for one-button switching between floating and locking modes. The lumbar support has three-dimensional multi-position adjustment (forward / backward, up / down, and tilt), and the headrest integrates a three-way adjustment assembly (rotation, forward / backward, and up / down). The armrests are adjustable. During the reclining process, the lumbar support continuously conforms to the human waist, eliminating back slippage; the adjustment is smooth, the positions are securely locked, the structure is stable, and long-term sitting comfort is high.

Description

Technical Field

[0001] This invention relates to the field of seating technology, and more specifically to an adjustable backrest and seat. Background Technology

[0002] Most existing office and ergonomic chairs use a rigid linkage structure between the seat and backrest. When users lean back, the lumbar support easily detaches from the lower back, creating a gap, commonly known in the industry as "lumbar slippage." This results in the lower back losing effective support, causing spinal imbalance, and prolonged sitting can easily lead to health problems such as lumbar muscle strain and lumbar spine deformation. Existing authorized patent CN217185374U discloses an adjustable lumbar support, whose structure includes a back panel, a backrest support base, a backrest support frame, and a headrest support. The backrest support frame has two sets of upper and lower swing support plates, which are directly hinged to the backrest support base, allowing only tilting and swinging support. This solution has significant drawbacks: the upper and lower swing support plates cannot adaptively slide along the backrest height direction. Different users have significant differences in height, waist height, and lumbar curve, and the single hinged swing structure cannot conform to the lower back of various groups, resulting in poor lumbar support fit and insufficient overall seat adaptability and comfort. Therefore, there is an urgent need to optimize and improve the seat adjustment structure. Summary of the Invention

[0003] The purpose of this invention is to provide a stable, reliable, easy-to-adjust, fully adaptable adjustable seat back that conforms to the human body curve and can self-adaptively float, in order to overcome the shortcomings of existing technologies. This solves the problems of traditional seats slipping on the waist, poor fit for people of different heights, and low lumbar support, thereby improving the comfort of sitting for long periods of time.

[0004] Another objective of this invention is to provide a stable, reliable, and easily adjustable seat.

[0005] The present invention achieves the above-mentioned objective by adopting the following technical solution: an adjustable seat back, characterized in that it includes a backrest support and a backrest body movably disposed thereon, a backrest lifting and adjusting mechanism, the backrest lifting and adjusting mechanism including a control switch, a guide groove, a slide, a spring assembly, and a multi-positioning assembly, the slide being provided with a slider, the slider being slidably mounted on the guide groove, the multi-positioning assembly including a rack and a locking block matching the teeth of the rack, the locking block having shafts on both sides respectively and rotatably connected to the slide, the rack being disposed on the backrest support, and the multi-position lifting and adjusting of the backrest support being realized through the movable engagement of the locking block and the rack;

[0006] The slide includes an upper slide and a lower slide. A slider one is set on the back of the lower slide, and a slider two is set on the front of the lower slide. The upper slide has a guide groove two corresponding to the slider two. A spring assembly is connected between the upper slide and the backrest support. Relying on the elastic tension of the spring assembly, the slider two can slide vertically along the guide groove two, so that the backrest can be adjusted up and down according to the force of the human body leaning.

[0007] The control switch includes a stop groove, a stop block, and a switch assembly. The switch assembly is connected to the stop block, and the stop block is movably disposed in the stop groove. The stop groove is disposed on the outside of the second guide groove and communicates with the second guide groove. When the switch assembly is toggled, causing the stop block to slide into the second guide groove, the stop block presses against the second slider, locking the vertical displacement of the second slider and disabling the adaptive floating function. After the stop block slides away from the second guide groove, the second slider is released from its limit, and the backrest returns to the adaptive floating state.

[0008] As a further explanation of the above solution, the switch assembly includes a switch handle and a switch shaft. The switch handle is rotatably connected to the backrest body through the switch shaft. The backrest body is provided with a handle groove corresponding to the switch handle. A connecting shaft is vertically provided on the stop block. A clamping fork groove is provided at the eccentric position of the switch handle. The connecting shaft passes through the clamping fork groove. A rotary guide mechanism is provided between the handle groove and the switch handle. The rotary guide mechanism includes an arc-shaped limiting block and an arc-shaped groove to limit the swing angle of the switch handle.

[0009] Furthermore, the front of the sliding base is provided with a boss, and a slot is provided on the boss. The bottom of the second slider is provided with a locking block that engages with the slot. The second slider is provided with screws that are connected and fixed to the boss.

[0010] Furthermore, the backrest body is provided with a lumbar support, which includes a lumbar support fixing rod sleeve, a lumbar support fixing rod, a lumbar support fixing seat, a lumbar support movable seat, and a lumbar support body. A U-shaped bracket is provided on the lumbar support movable seat, and the lumbar support body is connected to the U-shaped bracket pivot. The lumbar support fixing rod sleeve is connected and fixed to the backrest body, and the lumbar support fixing rod is inserted and fitted with the lumbar support fixing rod sleeve. A multi-position snap-fit ​​component one is provided between the lumbar support fixing rod and the lumbar support fixing rod sleeve. The lumbar support fixing seat is fixed to the end of the lumbar support fixing rod, and the lumbar support movable seat is slidably fitted with the lumbar support fixing seat. A multi-position snap-fit ​​component two is provided between the lumbar support movable seat and the lumbar support fixed seat.

[0011] Furthermore, the lumbar support fixed seat is provided with a slider guide groove 1, and the multi-position snap-fit ​​assembly 1 includes a multi-position snap-fit ​​block 1, a spring 1, and a guide groove tooth 1 disposed inside the slider guide groove 1. The multi-position snap-fit ​​block 1 is rotatably connected to the lumbar support movable seat, and the spring 1 is connected between the snap-fit ​​block 1 and the lumbar support movable seat. The multi-position snap-fit ​​block 1 is movably disposed in the slider guide groove 1 and is movably snap-fitted with the guide groove tooth 1.

[0012] The lumbar support fixing rod sleeve is provided with a slider guide groove 2. The multi-position locking assembly 2 includes a multi-position locking block 2, a spring 2, and guide groove teeth 2 set inside the slider guide groove 2. The multi-position locking block 2 is rotatably connected to the lumbar support fixing rod. The spring 2 is connected between the locking block 2 and the lumbar support fixing rod. The multi-position locking block 2 is movably set inside the slider guide groove 2 and is movably locked and engaged with the guide groove teeth 2.

[0013] Furthermore, the lumbar support movable seat is provided with lumbar support lifting guide grooves on both sides parallel to the slider guide groove. The lumbar support lifting guide grooves are provided with opposing protrusions on both sides, and guide limiting plates are movably installed on the two protrusions. The guide limiting plates are connected and fixed to the lumbar support fixed seat by screws. Elastic cover plates are provided outside the guide limiting plates on both sides. The two ends of the elastic cover plates extend outward and support the lower part of the lumbar support body.

[0014] A chair, characterized in that it includes a seat, a leg and an adjustable backrest, armrest assemblies are respectively provided on both sides of the seat, the leg is connected to the seat and the seat is connected to the backrest support.

[0015] As a further explanation of the above solution, a headrest assembly is fixedly connected to the upper part of the adjustable seat back. The headrest assembly includes a headrest support and a headrest. The headrest support includes a rotation adjustment assembly, a front-to-back adjustment assembly, and a height adjustment assembly.

[0016] The rotation adjustment assembly includes a fixed arm and a movable arm hinged to the fixed arm. One end of the fixed arm is connected and fixed to the backrest body, and the end of the movable arm is provided with a U-shaped groove.

[0017] The front and rear adjustment assembly includes a T-shaped plate base and a cover. The T-shaped plate base is connected to the U-shaped groove. A multi-position snap-fit ​​assembly is provided between the T-shaped plate base and the U-shaped groove. The cover is fixed outside the T-shaped plate base. The multi-position snap-fit ​​assembly includes a multi-position snap-fit ​​block, a spring, and a snap-fit ​​guide groove with guide teeth.

[0018] The height adjustment assembly includes a lifting guide rail rod set on the back of the headrest and a lifting adjustment shaft that runs horizontally through the lifting guide rail rod. Multiple recesses are arranged sequentially along the axial direction inside the lifting guide rail rod. A ball bearing assembly is arranged between the lifting adjustment shaft and the recesses. The two ends of the lifting adjustment shaft are respectively hinged to the cover, so that the headrest can be adjusted up and down relative to the cover.

[0019] Furthermore, the armrest assembly includes an armrest support, an armrest rotating arm, an armrest board seat, and an armrest cover. The armrest support is fixedly connected to the chair seat, the armrest rotating arm is rotatably connected to the armrest support, the armrest board seat is movably connected to the top of the armrest rotating arm, and the armrest cover is fitted over the armrest board seat.

[0020] The beneficial effects that can be achieved by adopting the above-mentioned technical solution in this invention are as follows.

[0021] 1. This invention adopts a double-layer sliding base + rack and pinion multi-position locking + spring adaptive floating composite backrest lifting mechanism. The rack and pinion block realizes multi-position locking of the overall backrest height, which can accommodate people of different heights from 150-190cm. The spring, together with the upper sliding base, lower sliding base and guide groove, realizes that the backrest adaptively floats up and down according to the human body's leaning force. When reclining, the lumbar support always fits the waist, eliminating the problem of "lumbar slippage". It is equipped with an eccentric control switch, which can switch between floating and locking modes with one button. The operation is simple. The arc-shaped limit structure limits the swing angle of the switch. The mechanism is durable and not easy to be damaged.

[0022] 2. The lumbar support of the present invention has three-dimensional multi-position adjustment of forward and backward extension, up and down lifting, and tilting and rotating. It relies on two sets of independent toothed locking components to lock the forward and backward and height positions respectively. With the elastic buffer cover, it perfectly fits the waist position and waist and abdomen curve of different users, and the lumbar support is uniform, which greatly reduces the risk of lumbar muscle strain from prolonged sitting.

[0023] 3. The headrest of the present invention integrates a three-way adjustment component for rotation, forward and backward extension, and up and down lifting, with multi-position ball / lock positioning, which can adapt to different head and neck lengths and leaning angles, and disperse cervical spine pressure.

[0024] 4. The armrest of this invention adopts a rotary adjustable structure, which, together with the backrest lifting linkage, adapts to the arm support height, thereby improving the overall comfort of use.

[0025] 5. The present invention features a fully built-in sliding guide and snap-fit ​​positioning structure with a simple appearance; each adjustment component is modularly assembled, making disassembly, maintenance, and production assembly convenient; the sliding is smooth, the gears are securely locked, and it is not easy to slip under force, resulting in a stable and durable structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the backrest structure of the present invention.

[0029] Figure 4 This is a schematic diagram of the backrest structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the backrest structure of the present invention.

[0031] Figure 6 This is a schematic diagram of the headrest and backrest structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the slide mounting structure.

[0033] Figure 8 Schematic diagram of the switch handle structure.

[0034] Figure 9 This is a schematic diagram of the slide block structure.

[0035] Figure 10 This is a schematic diagram of the slide mounting structure.

[0036] Figure 11 This is a schematic diagram of the slide block structure.

[0037] Figure 12 This is a schematic diagram of the slide block structure.

[0038] Figure 13 This is a schematic diagram of the second slider.

[0039] Figure 14 This is a schematic diagram of the lumbar support adjustment mechanism.

[0040] Figure 15 This is a schematic diagram of the lumbar support adjustment mechanism.

[0041] Figure 16 This is a schematic diagram of the headrest support structure.

[0042] Figure 17 This is a schematic diagram of the headrest support structure.

[0043] Figure 18 This is a schematic diagram of the headrest support structure.

[0044] Figure 19 This is a schematic diagram of the handrail installation structure.

[0045] Figure 20 This is a schematic diagram of the handrail structure.

[0046] Figure labeling: 1. Seat; 2. Chair legs; 3. Adjustable seat back; 3-1. Backrest main body; 3-11. Handle groove; 3-2. Lumbar support; 3-21. Lumbar support fixing rod sleeve; 3-211. Slider guide groove two; 3-22. Lumbar support fixing rod; 3-23. Lumbar support fixing seat; 3-231. Slider guide groove one; 3-24. Lumbar support movable seat; 3-241. U-shaped bracket; 3-242. Protruding edge; 3-243. Lumbar support lifting guide groove; 3-244. Guide limit plate; 3-245. Elastic cover plate; 3-25. Lumbar support main body; 3-26. Multiple 3-261, Multi-position locking component 1; 3-262, Guide groove teeth 1; 3-27, Multi-position locking component 2; 3-271, Multi-position locking block 2; 3-272, Guide groove teeth 2; 3-3, Backrest lifting adjustment mechanism; 3-31, Control switch; 3-311, Stop groove; 3-312, Stop block; 3-313, Switch assembly; 3-3131, Switch handle; 3-3132, Switch shaft; 3-3133, Clamping fork groove; 3-314, Connecting shaft; 3-315, Rotary guide mechanism; 3-3151, Arc-shaped limit block; 3-3152, Arc-shaped groove; 3-32, Guide groove one; 3-33, Slide; 3-331, Upper slide; 3-3311, Guide groove two; 3-332, Lower slide; 3-3321, Boss; 3-3322, Slot; 3-34, Multi-position positioning assembly; 3-341, Rack; 3-342, Protruding edge; 3-35, Slider one; 3-36, Slider two; 3-361, Locking block; 4, Backrest bracket; 5, Headrest assembly; 5-1, Headrest support; 5-11, Rotation adjustment assembly; 5-111, Fixed arm; 5-112, Movable arm; 5-1 121. U-shaped groove; 5-12. Front and rear adjustment assembly; 5-121. T-shaped plate base; 5-122. Cover; 5-123. Multi-position snap-fit ​​assembly three; 5-1231. Multi-position snap-fit ​​block three; 5-1232. Snap-fit ​​block guide groove three; 5-13. Up and down adjustment assembly; 5-131. Lifting guide rail rod; 5-1311. Recess; 5-132. Lifting adjustment shaft; 5-2. Headrest; 6. Armrest assembly; 6-1. Armrest support; 6-2. Armrest rotating arm; 6-3. Armrest plate base; 6-4. Armrest cover; 6-5. Connecting shaft; 6-6. Ball recess. Detailed Implementation

[0047] In the description of this invention, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. They should not be construed as limiting the specific protection scope of this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "at least" means one or more, unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "below" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0052] like Figures 1-20As shown, the present invention relates to an adjustable seat back and seat. The seat generally includes a seat 1, a leg 2, and an adjustable seat back 3, with the leg 2 connected to the seat 1. The adjustable seat back 3 includes a backrest support 4 and a backrest body 3-1, a lumbar support 3-2, and a backrest lifting adjustment mechanism 3-3 movably mounted on it. The seat 1 is connected to the backrest support 4, the adjustable seat back 3 is movably mounted on the backrest support 4, and the backrest lifting adjustment mechanism 3-3 is located between the backrest support 4 and the backrest body 3-1. The backrest height adjustment mechanism 3-3 includes a control switch 3-31, a guide groove 3-32, a slide 3-33, a spring assembly, and a multi-positioning assembly 3-34. The slide 3-33 is equipped with a slider 3-35, which is slidably mounted on the guide groove 3-32. The multi-positioning assembly 3-34 includes a rack 3-341 and a locking block 3-342 that matches the teeth of the rack. Shafts are provided on both sides of the locking block and are rotatably connected to the slide 3-33. The rack 3-341 is mounted on the backrest bracket 3-1 and engages with the rack 3-341 via the locking block 3-342. The backrest support features multi-level height adjustment; the slide block 3-33 includes an upper slide block 3-331 and a lower slide block 3-332, a slider 3-35 is located on the back of the lower slide block 3-332, a slider 3-36 is located on the front of the lower slide block 3-332, the upper slide block 3-331 is provided with a guide groove 3-3311 corresponding to the slider 3-36, and a spring assembly is connected between the upper slide block and the backrest support. Through the elastic force of the spring assembly, the spring assembly continuously provides elastic tension, and the backrest slides vertically along the guide groove 3-3311 by the slider 3-36, realizing adaptive floating adjustment of the backrest. The control switch 3-31 includes a stop groove 3-311, a stop block 3-312, and a switch assembly 3-313 connected to the stop block. The stop block 3-312 is movably disposed in the stop groove 3-311. The stop groove 3-311 is disposed outside the guide groove 3-3311 and communicates with the guide groove 3-3311. When the stop block slides along the stop groove and enters the guide groove, it can restrict the displacement of the slider.

[0053] The switch assembly 3-313 includes a switch handle 3-3131 and a switch shaft 3-3132. The switch handle is rotatably connected to the backrest body 3-1 via the switch shaft 3-3132. The backrest body 3-1 is provided with a handle groove 3-11 corresponding to the switch handle. A connecting shaft 3-314 is vertically provided on the stop block 3-312. A clamping fork groove 3-3133 is provided at the eccentric position of the switch handle 3-3131. The connecting shaft 3-314 passes through the clamping fork groove 3-3133. A rotary guide mechanism 3-315 is provided between the handle groove 3-11 and the switch handle 3-3131. The rotary guide mechanism includes an arc-shaped limiting block 3-3151 and an arc-shaped groove 3-3152, which limits the maximum swing angle of the switch handle and prevents over-rotation failure. The front of the sliding base 3-332 is provided with a boss 3-3321, and a slot 3-3322 is provided on the boss. The bottom of the slider 3-36 is provided with a locking block 3-361 that engages with the slot 3-3322. The slider is provided with a screw. The screw is locked into the boss to complete the rigid fixation of the slider and the sliding base, making disassembly and maintenance convenient.

[0054] The lumbar support 3-2 includes a lumbar support fixing rod sleeve 3-21, a lumbar support fixing rod 3-22, a lumbar support fixing seat 3-23, a lumbar support movable seat 3-24, and a lumbar support body 3-25. A U-shaped bracket 3-241 is provided on the lumbar support movable seat 3-24, and the lumbar support body 3-25 is pivotally connected to the U-shaped bracket 3-241. The lumbar support fixing rod sleeve 3-21 is connected and fixed to the backrest body 3-25. The lumbar support fixing rod 3-22 is inserted and fitted with the lumbar support fixing rod sleeve 3-21. A multi-position snap-fit ​​component 3-26 is provided between the lumbar support fixing rod 3-22 and the lumbar support fixing rod sleeve 3-21. The lumbar support fixing seat 3-23 is fixed to the end of the lumbar support fixing rod 3-22. The lumbar support movable seat 3-24 is slidably fitted with the lumbar support fixing seat 3-23. A multi-position snap-fit ​​component 3-27 is provided between the lumbar support movable seat and the lumbar support fixing seat.

[0055] The lumbar support fixing seat 3-23 is provided with a slider guide groove 3-231. The multi-position locking assembly 3-26 includes a multi-position locking block 3-261, a spring, and a guide tooth 3-262 disposed inside the slider guide groove 3-261. The multi-position locking block 3-261 is rotatably connected to the lumbar support movable seat. The spring is connected between the locking block 3-261 and the lumbar support movable seat. The multi-position locking block 3-261 is movably disposed in the slider guide groove 3-261 and is movably locked with the guide tooth 3-262. The lumbar support fixing rod sleeve 3-21 is provided with a slider guide groove 3-211. The multi-position locking assembly 3-27 includes a multi-position locking block 3-271, a spring 2, and a guide tooth 3-272 disposed inside the slider guide groove 2. The multi-position locking block 2 is rotatably connected to the lumbar support fixing rod. The spring 2 is connected between the locking block 2 and the lumbar support fixing rod. The multi-position locking block 2 is movably disposed in the slider guide groove 2 and is movably locked with the guide tooth 2.

[0056] The lumbar support movable seat 3-24 is provided with lumbar support lifting guide grooves 3-243 on both sides parallel to the slider guide groove. The lumbar support lifting guide grooves are provided with opposing protrusions 3-242 on both sides. Guide limiting plates 3-244 are movably installed on the two protrusions 3-242. The guide limiting plates are connected and fixed to the lumbar support fixed seat by screws. Elastic cover plates 3-245 are provided outside the guide limiting plates on both sides. The two ends of the elastic cover plates extend outward and support the lower part of the lumbar support body.

[0057] A headrest assembly 5 is fixedly connected to the upper part of the backrest body 3-1. The headrest assembly 5 includes a headrest support 5-1 and a headrest 5-2. The headrest support 5-1 includes a rotation adjustment assembly 5-11, a front-back adjustment assembly 5-12, and a height adjustment assembly 5-13. The rotation adjustment assembly 5-11 includes a fixed arm 5-111 and a movable arm 5-112 hinged to the fixed arm. One end of the fixed arm 5-111 is fixedly connected to the backrest body 3-1, and the end of the movable arm 5-112 is provided with a U-shaped groove 5-1121. The front-back adjustment assembly 5-12 includes a T-shaped plate base 5-121 and a cover 5-122. The T-shaped plate base 5-121 is inserted into the U-shaped groove 5-1121, and a space is provided between the T-shaped plate base 5-121 and the U-shaped groove 5-1121. The headrest is equipped with a multi-position locking assembly 5-123. The cover 5-122 is fixed outside the T-shaped plate base 5-121. The multi-position locking assembly 5-123 includes a multi-position locking block 5-1231, a spring, and a locking block guide groove 5-1232 with guide groove teeth. The height adjustment assembly 5-13 includes a lifting guide rail 5-131 set on the back of the headrest and a lifting adjustment shaft 5-132 that runs horizontally through the lifting guide rail. Multiple recesses 5-1311 are arranged sequentially along the axial direction inside the lifting guide rail 5-131. A ball assembly is set between the lifting adjustment shaft and the recesses. The ball assembly is locked into the recesses to achieve height locking. The two ends of the lifting adjustment shaft 5-132 are hinged to the inside of the cover. The headrest can slide vertically along the lifting guide rail to complete the headrest height adjustment.

[0058] Armrest assemblies 6 are provided on both sides of the seat 1. Each armrest assembly 6 includes an armrest support 6-1, an armrest rotating arm 6-2, an armrest board seat 6-3, and an armrest cover 6-4. The armrest support 6-1 is fixedly connected to the seat 1, the armrest rotating arm 6-2 is rotatably connected to the armrest support 6-1, the armrest board seat 6-3 is movably connected to the top of the armrest rotating arm, and the armrest cover 6-4 covers the armrest board seat 6-3. The armrests can rotate and be raised / lowered to adapt to the user's arm position. A connecting shaft 6-5 is provided on the end of the armrest rotating arm. Between the armrest rotating arm and the armrest support, there are interlocking ball bearings and multiple ball bearing recesses 6-6 to adjust the swing angle of the armrest rotating arm.

[0059] Working principle of this embodiment:

[0060] 1. Backrest overall height adjustment: Lift the backrest, the locking block disengages from the rack and pinion teeth, and the slider slides up and down along the guide groove. After adjusting to the appropriate height, release the lock, and the locking block will automatically engage with the rack and pinion teeth to lock the overall height.

[0061] 2. Adaptive floating switch: When the side switch handle is turned, the stop block slides away from the guide groove two, and the slider two is unlocked. When leaning back, the backrest floats up and down adaptively by the spring tension, so that the backrest does not slip when leaning back; when the switch is turned in the opposite direction, the stop block limits the slider two, the floating is closed, and the backrest is rigidly fixed.

[0062] 3. Lumbar support adjustment: Pull the lumbar support to extend and retract forward and backward, and raise and lower it up and down. Release the automatic position lock, and the main body of the lumbar support can tilt and rotate to fit the waist curve.

[0063] 4. The headrest and armrests are independently adjustable in multiple dimensions to suit the needs of head, neck and arm support.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An adjustable seat back, characterized in that, It includes a backrest support and a backrest body movably mounted thereon, a backrest lifting and adjusting mechanism, and a control switch, a guide groove, a slide block, a spring assembly, and a multi-positioning assembly. The slide block is provided with a slider, which is slidably mounted on the guide groove. The multi-positioning assembly includes a rack and a locking block that matches the teeth of the rack. Shafts are provided on both sides of the locking block and are rotatably connected to the slide block. The rack is mounted on the backrest support. The multi-position lifting and adjusting of the backrest support is realized through the movable engagement of the locking block and the rack. The slide includes an upper slide and a lower slide. A slider one is set on the back of the lower slide, and a slider two is set on the front of the lower slide. The upper slide has a guide groove two corresponding to the slider two. A spring assembly is connected between the upper slide and the backrest support. Relying on the elastic tension of the spring assembly, the slider two can slide vertically along the guide groove two, so that the backrest can be adjusted up and down according to the force of the human body leaning. The control switch includes a stop groove, a stop block, and a switch assembly. The switch assembly is connected to the stop block, and the stop block is movably disposed in the stop groove. The stop groove is disposed on the outside of the second guide groove and communicates with the second guide groove. When the switch assembly is toggled, causing the stop block to slide into the second guide groove, the stop block presses against the second slider, locking the vertical displacement of the second slider and disabling the adaptive floating function. After the stop block slides away from the second guide groove, the second slider is released from its limit, and the backrest returns to the adaptive floating state.

2. An adjustable seat back as described in claim 1, characterized in that, The switch assembly includes a switch handle and a switch shaft. The switch handle is rotatably connected to the backrest body via the switch shaft. The backrest body is provided with a handle groove corresponding to the switch handle. A connecting shaft is vertically provided on the stop block. A clamping fork groove is provided at the eccentric position of the switch handle. The connecting shaft passes through the clamping fork groove. A rotary guide mechanism is provided between the handle groove and the switch handle. The rotary guide mechanism includes an arc-shaped limit block and an arc-shaped groove.

3. An adjustable seat back according to claim 1, characterized in that, The front of the sliding block is provided with a boss, and a slot is provided on the boss. The bottom of the second slider is provided with a locking block that engages with the slot. The second slider is provided with screws that are connected and fixed to the boss.

4. An adjustable seat back according to claim 1, characterized in that, The backrest body is equipped with a lumbar support, which includes a lumbar support fixing rod sleeve, a lumbar support fixing rod, a lumbar support fixing seat, a lumbar support movable seat, and a lumbar support body. A U-shaped bracket is provided on the lumbar support movable seat, and the lumbar support body is connected to the U-shaped bracket pivot. The lumbar support fixing rod sleeve is connected and fixed to the backrest body, and the lumbar support fixing rod and the lumbar support fixing rod sleeve are engaged. A multi-position snap-fit ​​component one is provided between the lumbar support fixing rod and the lumbar support fixing rod sleeve. The lumbar support fixing seat is fixed to the end of the lumbar support fixing rod, and the lumbar support movable seat and the lumbar support fixing seat are slidably engaged. A multi-position snap-fit ​​component two is provided between the lumbar support movable seat and the lumbar support fixed seat.

5. An adjustable seat back according to claim 4, characterized in that, The lumbar support fixed seat is provided with a slider guide groove. The multi-position snap-fit ​​assembly includes a multi-position snap-fit ​​block, a spring, and a guide groove tooth set inside the slider guide groove. The multi-position snap-fit ​​block is rotatably connected to the lumbar support movable seat. The spring is connected between the snap-fit ​​block and the lumbar support movable seat. The multi-position snap-fit ​​block is movably set inside the slider guide groove and is movably snap-fitted with the guide groove tooth. The lumbar support fixing rod sleeve is provided with a slider guide groove 2. The multi-position locking assembly 2 includes a multi-position locking block 2, a spring 2, and guide groove teeth 2 set inside the slider guide groove 2. The multi-position locking block 2 is rotatably connected to the lumbar support fixing rod. The spring 2 is connected between the locking block 2 and the lumbar support fixing rod. The multi-position locking block 2 is movably set inside the slider guide groove 2 and is movably locked and engaged with the guide groove teeth 2.

6. An adjustable seat back according to claim 4, characterized in that, The lumbar support movable seat is provided with lumbar support lifting guide grooves on both sides parallel to the slider guide groove. The lumbar support lifting guide grooves are provided with opposing protrusions on both sides. Guide limiting plates are movably installed on the two protrusions. The guide limiting plates are connected and fixed to the lumbar support fixed seat by screws. Elastic cover plates are provided outside the guide limiting plates on both sides. The two ends of the elastic cover plates extend outward and support the lower part of the lumbar support body.

7. A type of seat, characterized in that, It includes a seat, legs, and an adjustable seat back as described in any one of claims 1-6. Armrest assemblies are provided on both sides of the seat, the legs are connected to the seat, and the seat is connected to the backrest support.

8. A seat according to claim 7, characterized in that, The upper part of the adjustable seat back is connected and fixed with a headrest assembly, which includes a headrest support and a headrest. The headrest support includes a rotation adjustment component, a fore-and-aft adjustment component, and a height adjustment component. The rotation adjustment assembly includes a fixed arm and a movable arm hinged to the fixed arm. One end of the fixed arm is connected and fixed to the backrest body, and the end of the movable arm is provided with a U-shaped groove. The front and rear adjustment assembly includes a T-shaped plate base and a cover. The T-shaped plate base is connected to the U-shaped groove. A multi-position snap-fit ​​assembly is provided between the T-shaped plate base and the U-shaped groove. The cover is fixed outside the T-shaped plate base. The multi-position snap-fit ​​assembly includes a multi-position snap-fit ​​block, a spring, and a snap-fit ​​guide groove with guide teeth. The height adjustment assembly includes a lifting guide rail rod set on the back of the headrest and a lifting adjustment shaft that runs horizontally through the lifting guide rail rod. Multiple recesses are arranged sequentially along the axial direction inside the lifting guide rail rod. A ball bearing assembly is arranged between the lifting adjustment shaft and the recesses. The two ends of the lifting adjustment shaft are respectively hinged to the cover, so that the headrest can be adjusted up and down relative to the cover.

9. A seat according to claim 7, characterized in that, The armrest assembly includes an armrest support, an armrest rotating arm, an armrest board seat, and an armrest cover. The armrest support is fixedly connected to the chair seat, the armrest rotating arm is rotatably connected to the armrest support, the armrest board seat is movably connected to the top of the armrest rotating arm, and the armrest cover is placed over the armrest board seat.

Images