A type of reclining chair

Abstract

This invention discloses a reclining chair, including a seat, armrests on both sides of the seat, and extensions extending rearward from both armrests. A backrest is fitted between the extensions. The backrest includes a back support and a rotating device. Rotating devices are respectively provided at the connecting parts on the left and right ends of the lower part of the back support. A forward-extending insert is fixed on the rotating base of the rotating device. The insert on the same side is inserted and fixed to the extension, allowing the backrest to rotate relative to the armrests and the seat. The extension is designed to shift the backrest's rotation point rearward, closely aligning with the natural rotation trajectory of the human hip. The connecting part is rotatably connected to the rotating base, and a locking component is provided between them. A coaxially rotating control component is provided on the connecting part or the rotating base, and the rotation control component can drive the locking component to lock or unlock the rotational movement. This solution eliminates the need for a traditional reclining chassis, integrating the reclining mechanism on both sides of the backrest, simplifying the structure, reducing the number of parts, and lowering costs. The rearward shift of the rotation point allows the backrest movement to conform to the physiological curve of the lower back, avoiding problems such as an unsupported lower back or back rubbing.

Description

Technical Field

[0001] This invention relates to the field of furniture, and in particular to a reclining chair. Background Technology

[0002] In the field of seating, the tilt adjustment function of the backrest and the reliability of the locking are core requirements for improving user comfort and safety. Most existing tilt seats rely on integrated tilt chassis to achieve the tilt function. These chassis need to integrate core components such as tilt transmission mechanism, locking components, and gear adjustment structure. This not only makes the chassis structure complex and bulky, but also significantly increases the manufacturing cost and overall weight of the seat, and reduces the seat assembly efficiency and portability.

[0003] Meanwhile, the rotation point of existing chair backs is usually located at the front of the seat or the middle of the chassis, which is too forward and does not match the natural rotation trajectory of the human hip. When the user leans back, the movement of the chair back is prone to relative displacement with the waist and back. On the one hand, it can easily cause discomfort such as rubbing the back and waist, and on the other hand, it can easily lead to a decrease in support and fit, resulting in reduced comfort. In addition, some solutions that attempt to omit the tilt chassis either lack stable gear adjustment and locking functions, or the locking structure is cumbersome, inconvenient to operate and unreliable. Moreover, the connection between the chair back and the armrests and seat is mostly fixed by bolts or plugs, which not only makes the assembly process complicated and the degree of modularity low, but also makes the chair back less flexible.

[0004] Nowadays, traditional designs that rely on tilting chassis can no longer meet the market's higher requirements for tilting seats. Therefore, there is an urgent need for a tilting seat that does not require an additional tilting chassis, has a compact structure, reliable locking, convenient operation, and is ergonomic. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a reclining chair, including a seat with armrests on both sides. Each armrest extends rearward with an extension portion, and a backrest is fitted between the extension portions. The backrest includes a back support and a rotating device. Rotating devices are respectively provided at the connecting portions on the left and right ends of the lower part of the back support. Forwardly extending inserts are fixed to the rotating base of the rotating device. Inserts on the same side are inserted and fixed to the extension portions, allowing the backrest to rotate relative to the armrests and seat. The extension portion design shifts the backrest's rotation point rearward, closely aligning with the natural rotation trajectory of the human hip. A connecting portion is rotatably connected to the rotating base, with a locking component between them. A coaxially rotating control component is provided on the connecting portion or the rotating base, which can drive the locking component to lock or unlock the rotational movement. This solution eliminates the need for a traditional reclining chassis, integrating the reclining mechanism on both sides of the backrest, simplifying the structure, reducing the number of parts, and lowering costs. The rearward shift of the rotation point allows the backrest movement to conform to the physiological curve of the lumbar spine, avoiding issues like unsupported back or back rubbing, ensuring continuous and stable support. The modular design of the backrest facilitates packaging, transportation, and self-installation by consumers, and the reclining, locking, and adjustment operations are convenient.

[0006] The technical solution of this invention is implemented as follows:

[0007] A reclining seat includes a seat with armrests on both sides. Each armrest extends rearward with an extension, and a backrest is located between the two extensions. The backrest includes a back support and a rotating device. The back support has two connecting parts near the armrests, located at the left and right ends of the lower part of the back support. The rotating device is provided on each of the two connecting parts. The rotating device includes a rotating base, on which a forward-extending insert is fixedly connected. The insert on the same side is inserted and fixed to the extension. The backrest is rotatably configured relative to the armrests and the seat via the rotating device. The connecting parts are rotatably connected to the rotating base, and the backrest rotates about the connecting axis between the left and right connecting parts and the rotating base. The extension is configured to move the rotation point of the backrest rearward. A locking component is also provided between the connecting parts and the rotating base, and a control component that rotates coaxially with the connecting parts is provided on the connecting parts or the rotating base. The control component is configured to rotate to drive the locking component to lock or unlock the rotational movement of the connecting parts and the rotating base.

[0008] First, this solution eliminates the need for a tilting chassis, simplifying the structure and reducing costs. By directly connecting the armrest extensions to the backrest rotation mechanism, the tilting mechanism is integrated into both sides of the backrest, eliminating the need for a complex tilting chassis and significantly simplifying the overall seat structure. This not only reduces the number of parts but also lowers manufacturing costs. Second, the extension design shifts the backrest rotation point backward, more closely aligning with the natural rotation trajectory of the human hip. When the user leans back, the backrest movement closely matches the physiological curve of the lumbar spine, preventing lumbar displacement, back strain, or back rubbing. This provides continuous and stable support for the lumbar and back during tilting, significantly improving seating comfort. Furthermore, the integrated rotation mechanism allows for low-cost, modular packaging and transportation. The simple and quick installation of the rotation mechanism and armrests makes it easier for consumers to install themselves. The convenient tilt locking and adjustment operation allows users to adjust the backrest while seated.

[0009] Preferably, the locking assembly includes a floating seat, a locking element, a locking groove, a first spring, and a second spring. The floating seat is slidably mounted on the connecting part, the locking groove is mounted on the rotating base, and the locking element is slidably mounted in the floating seat. The first spring is positioned between the floating seat and the connecting part, providing a spring force to the floating seat moving away from the locking groove. The second spring is positioned between the floating seat and the locking element, providing a spring force to the locking element moving towards the locking groove. When the control element rotates to make the floating seat slide towards the rotating base, the first spring is compressed, and the second spring is configured to allow the locking element to enter the locking groove when it aligns with the locking groove. The locking assembly features a dual-spring design, meaning that two different springs work together, allowing the locking element to both automatically disengage from the locking groove to unlock the backrest's tilt and rotation, and also to lock the control element even when it is not aligned with the locking groove. Furthermore, even after fine-tuning the backrest angle until the locking element aligns with the locking groove, locking can still be achieved, resulting in delayed locking. This solves the problem of traditional locking assemblies where the locking element must be aligned with the locking groove to lock, simplifying operation.

[0010] Preferably, the floating seat has a stop boss at the end near the rotating base. When the first spring extends, the floating seat slides away from the second component, and the stop boss drives the locking member away from the locking groove. The floating seat has a mounting groove, and the locking member is slidably mounted in the mounting groove. The second spring is disposed in the mounting groove, and the stop boss is located at the end of the mounting groove near the second component. When locked, the locking member is held in place by the second spring; when unlocked, the stop boss drives the locking member away from the locking groove.

[0011] Preferably, the locking element is cylindrical and has a raised ring. The two ends of the second spring abut against the groove wall of the mounting groove and the raised ring of the locking element, respectively. A stop boss is located between the raised ring and the rotating base. The raised ring not only abuts against the second spring but also effectively drives the locking element to move through the abutment between the stop boss and the raised ring.

[0012] Preferably, the connecting part is provided with a floating groove, and the floating seat is disposed in the floating groove.

[0013] Preferably, a guide post protrudes from the floating groove, with the extension direction of the guide post being the same as the sliding direction of the floating seat; a corresponding guide groove is provided on the floating seat, and the guide post is inserted into the guide groove; a first spring is sleeved on the guide post, with both ends of the first spring abutting against the groove wall of the floating groove and the groove wall of the guide groove, respectively. The cooperation between the guide post and the guide groove makes the sliding of the floating seat more stable.

[0014] Preferably, the connecting part is also provided with a through hole, which communicates with the floating groove. The locking element is disposed in the through hole and is exposed or retracted through the through hole.

[0015] Preferably, the control component has a control section on the side facing the rotating component, extending along the rotation direction of the control component. The control section includes a disengagement section, an inclined section, and a locking section. The disengagement section and the locking section are located on opposite sides of the inclined section. From the disengagement section to the locking section, the inclined section protrudes near the rotating component, and the disengagement section is farther from the rotating component than the locking section. The floating seat abuts against the control section under the action of the first spring. When the floating seat is at the disengagement section, the locking member disengages from the locking groove. When the floating seat is at the locking section, the locking member is inserted into the locking groove. The control component can achieve locking and unlocking control of the locking member simply through its control section structure and in conjunction with the first spring. The structure is simple and requires no additional parts or linkages to link the control component and the locking member.

[0016] Preferably, there is a protrusion extending beyond the inclined section and the locking section. The protrusion prevents the floating seat from sliding onto the inclined section during the locking phase, thus preventing locking failure.

[0017] Preferably, the floating seat includes a head with an arcuate surface, and the control part abuts against the head. The arcuate surface of the head allows for a smoother sliding engagement with the control part.

[0018] Preferably, the control also includes a raised handle. The raised handle facilitates operation of the control by the user.

[0019] Preferably, the armrest includes an armrest seat connected to the chair seat, with an extension extending rearward from the armrest seat. Because the armrest seat has a rearward extension, the rotation point of the backrest support is moved rearward closer to the hip area, i.e., the rotation point of the upper and lower body when the user leans back or stands upright in the seat. This prevents back rubbing and lumbar slippage, allowing the backrest and lumbar support to better conform to the user's lower back when rotating. This design is more ergonomic and greatly improves the comfort of the chair. Furthermore, the above design places the armrest further forward than the chair back, with space between the armrest and the chair back. This allows for more flexible and unobstructed movement of the armrest.

[0020] Preferably, the armrest includes a hollow sleeve portion, which is arranged vertically. An armrest moving component is provided vertically inside the sleeve portion, and an arm support component for supporting the human arm is provided at the upper end of the armrest moving component. An extension portion is provided on the sleeve portion extending rearward, and the slot of the extension portion is open to the rear. The extension portion and the sleeve portion are T-shaped.

[0021] Preferably, the insert has an anti-detachment end located within the rotating base. The anti-detachment end includes a gap and two anti-detachment portions located on both sides of the gap. Each anti-detachment portion has at least one protruding anti-detachment angle, which hooks inside the rotating base. The anti-detachment angle increases the connection stability between the insert and the rotating base, preventing the insert from detaching from the rotating base.

[0022] Preferably, the insert and the extension are inserted into each other in the front-to-back direction and secured by at least two screws. The screws are installed in the left-to-right direction to lock the insert and the extension in place and keep them relatively fixed.

[0023] Preferably, the insert is a metal plate. This helps to increase the connection strength between the rotating base and the extension.

[0024] Preferably, the back support includes two L-shaped arms located at its lower part, the two arms being spaced apart and symmetrically arranged, both arms extending downward first and then outward and forward, the connecting part being formed at the front end of the arms.

[0025] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0026] First, this solution eliminates the need for a tilting chassis, simplifying the structure and reducing costs. By directly connecting the armrest extensions to the backrest rotation mechanism, the tilting mechanism is integrated into both sides of the backrest, eliminating the need for a complex tilting chassis and significantly simplifying the overall seat structure. This not only reduces the number of parts but also lowers manufacturing costs. Second, the extension design shifts the backrest rotation point backward, more closely aligning with the natural rotation trajectory of the human hip. When the user leans back, the backrest movement closely matches the physiological curve of the lumbar spine, preventing lumbar displacement, back strain, or back rubbing. This provides continuous and stable support for the lumbar and back during tilting, significantly improving seating comfort. Furthermore, the integrated rotation mechanism allows for low-cost, modular packaging and transportation. The simple and quick installation of the rotation mechanism and armrests makes it easier for consumers to install themselves. The convenient tilt locking and adjustment operation allows users to adjust the backrest while seated. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the seat back in an embodiment of the present invention when it is vertical. Figure 1 ;

[0028] Figure 2 This is a three-dimensional structural diagram of the seat back in an embodiment of the present invention when it is vertical. Figure 2 ;

[0029] Figure 3 This is a three-dimensional structural diagram of the seat back when it is folded down in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure connecting the chair back, armrests, and seat in an embodiment of the present invention. Figure 1 ;

[0031] Figure 5This is a schematic diagram of the three-dimensional structure connecting the chair back, armrests, and seat in an embodiment of the present invention. Figure 2 ;

[0032] Figure 6 This is a three-dimensional structural diagram of the modular chair back in an embodiment of the present invention;

[0033] Figure 7 This is a three-dimensional structural diagram of the back support in an embodiment of the present invention;

[0034] Figure 8 This is a three-dimensional structural diagram of the armrest seat in an embodiment of the present invention;

[0035] Figure 9 This is a side view of the armrest seat in an embodiment of the present invention;

[0036] Figure 10 This is a three-dimensional structural diagram of the insert and the rotating base connected together in an embodiment of the present invention;

[0037] Figure 11 This is a three-dimensional structural diagram of the insert in an embodiment of the present invention;

[0038] Figure 12 This is a cross-sectional view of the rotating base in an embodiment of the present invention;

[0039] Figure 13 This is a cross-sectional view of the connection between the rotating base and the handrail in an embodiment of the present invention;

[0040] Figure 14 This is a schematic diagram of the chair back tilting and the lumbar support floating up and down in an embodiment of the present invention;

[0041] Figure 15 This is a three-dimensional structural diagram of the lumbar support in an embodiment of the present invention;

[0042] Figure 16 This is a cross-sectional view of the lumbar support in an embodiment of the present invention;

[0043] Figure 17 This is an exploded view of the lifting seat and waist support in an embodiment of the present invention;

[0044] Figure 18 This is a three-dimensional structural diagram of the lumbar support and lumbar support member rotatably connected in an embodiment of the present invention;

[0045] Figure 19 This is a three-dimensional structural diagram of the present invention in which a second elastic resetting member is provided between the protruding rod and the waist support in an embodiment of the present invention;

[0046] Figure 20 This is a three-dimensional structural diagram of the rotation limiting screw and rotation limiting groove disposed on the rotating base and the connecting part in an embodiment of the present invention;

[0047] Figure 21 The explosion of the rotating device in the embodiment of the present invention Figure 1 ;

[0048] Figure 22 The explosion of the rotating device in the embodiment of the present invention Figure 2 ;

[0049] Figure 23 This is a cross-sectional view of the rotating device in an embodiment of the present invention when the locking member is not aligned with the locking groove;

[0050] Figure 24 This is a three-dimensional structural diagram of the floating seat and locking component in an embodiment of the present invention;

[0051] Figure 25 This is a three-dimensional structural diagram of the control element and its control portion in an embodiment of the present invention;

[0052] Figure 26 This is a three-dimensional structural diagram of the floating groove on the connecting part in an embodiment of the present invention.

[0053] The reference numerals in the attached figures are as follows: seat 1; chassis 21; lifting gas spring 22; five-star base 23; armrest 3; armrest seat 31; sleeve part 311; extension part 312; slot 313; armrest moving part 32; arm support 33; back support 41; support arm 411; connecting part 412; crossbar 413; receiving groove 414; backrest 42; lumbar support 5; mounting seat 51; feed seat 511; front and rear adjustment assembly 52; lifting seat 53; lifting block 541; first elastic reset part 542; lumbar support 55; lumbar support 56; lumbar frame 561; connecting rod 562; protruding rod 56 3; Second elastic reset component 564; Rotating device 6; Rotating base 61; Insert 62; Anti-detachment end 63; Gap 631; Anti-detachment part 632; Anti-detachment angle 633; ​​Rotating shaft 7; Floating groove 8; Guide post 9; Guide groove 10; First spring 11; Locking component 12; Mounting groove 13; Second spring 14; Stop boss 15; Protruding ring 16; Through hole 17; Locking groove 18; Floating seat 19; Control component 20; Disengagement section 201; Inclined section 202; Locking section 203; Handle 26; Alloy block 27; Tilting elastic component 28; Rotation limiting screw 29; Rotation limiting groove 30. Detailed Implementation

[0054] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0055] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0056] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] The specific embodiments of the present invention are as follows:

[0058] like Figure 1-6 As shown, the present invention provides a reclining chair, including a seat 1, a support base below the seat 1, the support base including a chassis 21, a lifting gas spring 22, and a five-star base 23, the lifting gas spring 22 being inserted into the five-star base 23, the upper end of the lifting gas spring 22 being connected to the chassis 21, the chassis 21 being mounted on the lower surface of the seat 1; the seat 1 also has armrests 3, two in total, arranged on the left and right sides of the seat 1 and respectively mounted on the lower surface of the seat 1 next to the chassis 21; the armrests 3 have backrests, the backrests including a back support 41, the back support 41 having a backrest 42 or a back support for supporting the human back. 41 includes a backrest 42 integrally formed with the back support 41 for supporting the back of the human body. The back support 41 is also provided with a lumbar support 5, which is located below the backrest 42. The two may partially overlap. The back support 41 has two connecting parts 412 near the armrests 3. The connecting parts 412 are located on the left and right ends of the lower part of the back support 41. Each of the two connecting parts 412 is provided with a rotating device 6. The rotating device 6 and the back support 41 are integrated together and are both part of the modular chair back. The rotating device 6 includes a rotating base 61, which is rotatably connected to the connecting parts 412. The rotating base 61 is also fixedly connected to the armrests 3.

[0059] like Figure 7 As shown, the back support 41 includes two L-shaped support arms 411 located at its lower part. The two support arms 411 are spaced apart from each other and arranged symmetrically. Both support arms 411 extend downward first and then outward and forward. The connecting part 412 is formed at the front end of the support arm 411.

[0060] like Figure 8-13As shown, the armrest 3 includes an armrest seat 31 connected to the seat 1. The armrest seat 31 includes a hollow sleeve portion 311, which is vertically arranged. An armrest moving component 32 is raised and lowered inside the sleeve portion 311. An arm support component 33 for supporting the human arm is provided at the upper end of the armrest moving component 32. A hollow extension portion 312 extends backward from the sleeve portion 311. The extension portion 312 has a slot 313 that opens backward. The extension portion 312 and the sleeve portion 311 are T-shaped. The rotating device 6 also includes an insert 62 fixedly connected to the rotating base 61. The insert 62 is a plate-shaped piece. One end of the insert 62 is fixedly disposed in the rotating base 61, and the other end of the insert 62 is inserted into the extension portion 312 and fixedly connected to the extension portion 312 by two screws.

[0061] The insert 62 is injection molded together with the rotating base 61. The insert 62 has an anti-detachment end 63 located inside the rotating base 61. The anti-detachment end 63 includes a gap 631 and two anti-detachment portions 632 located on both sides of the gap 631. The anti-detachment portion 632 has at least one protruding anti-detachment angle 633. The anti-detachment angle 633 hooks inside the rotating base 61 to prevent the insert 62 from detaching from the rotating base 61.

[0062] The insert 62 is made of metal to increase the connection strength between the rotating base 61 and the extension 312.

[0063] After the installation of the backrest and armrests 3 is completed, the backrest can tilt without relying on the chassis 21. The use of a simpler chassis with lower cost in the seat greatly reduces the cost of the seat. In the seat of this embodiment, the modular backrest integrates a rotating device 6. After the rotating device 6 is connected to the armrests 3 installed on the seat 1, the back support 41 can rotate relative to the rotating base 61 of the rotating device 6. This is equivalent to the back support 41 rotating relative to the armrests 3 and the seat 1, realizing the tilting of the backrest 42 and lumbar support 5 on the back support 41. The user can switch between sitting or resting postures as needed.

[0064] There are also some chairs on the market where the backrest and armrest 3 are rotatably connected. However, in these chairs, the rotatable point of the backrest is often directly set on the armrest 3. This results in the rotatable point of the backrest being forward, and the space between the armrest 3 and the backrest is limited, which may hinder the movement of the armrest 3 and limit its functionality.

[0065] In this embodiment, since the armrest seat 31 has a rearward extension 312, the rotation point of the back support 41 is moved backward to be close to the human hip, that is, the rotation point of the upper and lower body when the human body leans back or stands upright on the seat, thereby achieving the effect of preventing back rubbing and waist slippage, and making the backrest 42 and lumbar support 5 fit the human waist and back more closely when rotating. This design is more ergonomic and greatly improves the comfort of the seat.

[0066] Furthermore, the above design places the armrest 3 further forward than the backrest 42 and lumbar support 5, with ample space between the armrest 3 and the backrest 42 and lumbar support 5. This makes the position of the armrest 3 more reasonable, allowing for more varied and unobstructed movement. This embodiment only describes the lifting and lowering adjustment of the arm support 33, but because the arrangement of the armrest 3, backrest 42, and lumbar support 5 is more reasonable, the rotation, tilting, movement, and other large-range movements of the arm support 33 are not obstructed.

[0067] like Figure 14-19As shown, to further increase user comfort, the lumbar support 5 is given more mobility, making it suitable for people of different body types and for more usage scenarios. Specifically, the back support 41 includes a crossbar 413. In this embodiment, the backrest 42 is part of the back support 41, and the backrest 42 is a U-shaped frame located at the upper part of the back support 41. The crossbar 413 is part of the U-shaped frame and located at the lower part of the U-shaped frame and the middle of the back support 41. The lumbar support 5 is mounted on the crossbar 413. The modular lumbar support 5 includes a mounting base 51, a front and rear adjustment assembly 52, a lifting base 53, a lifting motion assembly, and a lumbar support 55. A waist-length support 56; a crossbar 413 is connected to a downwardly extending mounting base 51. The crossbar 413 has a receiving groove 414. The upper part of the mounting base 51 is embedded in the receiving groove 414 and then fixedly connected to the crossbar 413 with screws, thereby strengthening the integration of the mounting base 51 and the crossbar 413. The mounting base 51 includes a lower feed seat 511, which is sleeve-shaped. The feed seat 511 is equipped with a lifting seat 53 and a front-to-back adjustment assembly 52 for driving the lifting seat 53 to move back and forth. The lifting seat 53 contains a lifting motion assembly, which includes a lifting block 541 that moves up and down within the lifting seat 53. The lifting block 541 is limited by the lifting seat 53 to only move up and down. A first elastic reset member 542, which always provides an upward elastic force to the lifting block 541, is also provided between the lifting block 541 and the lifting seat 53. The lifting block 541 is connected to a waist support 55, which is arranged laterally and rotatably connected to waist support members 56 at both its left and right ends. The waist support members 56 rotate around a vertical axis. The waist support member 56 includes a waist frame 561 and a connecting rod 562 located at the outer end of the waist frame 561 and extending backward and inward. The inner end of the connecting rod 562 is rotatably connected to the waist support 55. A protruding rod 563 also extends inward from the inner end of the connecting rod 562. The protruding rod 563 is connected to the waist support 55. A second elastic reset member 564 is provided between the supports 55. The second elastic reset member 564 provides a forward elastic force to the protruding rod 563 so that the lumbar support member 56 has an outward rotation elastic force. When the waist rests on the two lumbar support members 56, the lumbar support member 56 adaptively rotates inward and retracts, and the second elastic reset member 564 is compressed. At the same time, under the action of the first elastic reset member 542, the lumbar support member 56 can adaptively adjust its height position. When the lumbar support member 56 moves down, the first elastic reset member 542 is stretched. When the lumbar support member 56 loses external force and resets, the first elastic reset member 542 contracts and returns to its original position, thereby driving the lumbar support member 56 to move up.

[0068] The lumbar support 56 can be moved forward and backward by the front and rear adjustment component 52 to adjust the seat depth and adjust the front and rear position of the lumbar support 56 according to the user's needs. The height adjustment of the lumbar support 56 can be achieved by the lifting motion component, so as to adapt to different body shapes and postures and fit the human waist. The rotation of the lumbar support 56 and the elastic reset component can achieve the adaptive inward movement of the lumbar support 56, so as to adapt to different body shapes and postures and provide a sense of wrapping and lumbar support, protect the waist and increase comfort.

[0069] The human body's lumbar curve differs between upright and reclining positions. The adaptive height adjustment of the lumbar support 5 allows it to adjust itself according to the changes in the curve of the human lumbar back. Specifically, the lumbar curve is closer to an S-shape when sitting upright and straighter when reclining. If the height of the lumbar support 5 remains unchanged at this time, it will not only cause discomfort by pressing against the lower back, but also fail to provide adequate support for the lower back, which requires more support. That is, when the human body switches from an upright to a reclining position, the lower back is easily suspended, resulting in an unsupported lower back, which can lead to fatigue and even health problems. In this embodiment, the lumbar support 5 provides lumbar support by adaptively lowering itself, which can effectively prevent an unsupported lower back, improve comfort, and protect lumbar health.

[0070] The first elastic reset component 542 is a tension spring, and the second elastic reset component 564 is a compression spring. The front-to-back adjustment assembly 52 mainly achieves the conversion of rotational motion into front-to-back movement through the threaded engagement of the screw and the threaded hole, thereby realizing the front-to-back position adjustment of the waist support 56, which will not be described in detail here. The rotation of the connecting part 412 and the rotating base 61 is mainly achieved by setting a rotating shaft 7 extending in both left and right directions on the connecting part 412 and opening a rotating groove on the rotating base 61 and placing the rotating shaft 7 in the rotating groove. In addition, a locking assembly and a reset torsion spring are provided between the connecting part 412 and the rotating base 61, thereby realizing the selective rotation of the back support 41 and the effect of resetting it to vertical position. The locking assembly will not be described in detail here.

[0071] In conventional chairs, the tilting points of the backrest 42 and lumbar support 5 are far from the hip area. When the user leans back, the lumbar support 5 and backrest 42 rotate backward while simultaneously causing significant displacement with the user's lower back. This not only results in discomfort such as a rubbing or lumbar chafing sensation, but also makes it difficult for the backrest 42 and lumbar support 5 to provide adequate support for the lower back. By integrating the above solutions in this embodiment, when the user leans back, the tilting point of the backrest 41 is near the user's hip area. This allows the rotation of the backrest 42 and lumbar support 5 to conform to the rotation of the user's lower back, preventing significant displacement between the lumbar support 5 and the user's waist. Both the backrest 42 and lumbar support 5 maintain their proper position. The lumbar support 56 is positioned in a suitable location to support the human lower back. When the lumbar support 56 is in this suitable position, the lumbar support 56 will provide twice the support and comfort for the lower back. In this embodiment, the lumbar support 56 also has adaptive lifting and adaptive inward adjustment functions, so that the lumbar support 56 moves to below the human lower back and always maintains support for the lower back, preventing the occurrence of an empty lower back. Moreover, the inward adjustment of the lumbar support 56 further enhances the comfort of the lower back by squeezing and wrapping the waist. Compared with existing lumbar support chairs, the chair in this embodiment is more ergonomic and can achieve a better user experience and comfort.

[0072] like Figure 20-26 As shown, the overall tilt of the chair back is controlled and achieved by the rotating device 6. Specifically, as... Figure 21-24As shown, the rotating device 6 also includes a floating seat 19, which is arc-shaped to accommodate rotational movement. The floating seat 19 is slidably mounted on the connecting part 412 and slides in the left-right direction. A floating groove 8 is provided on the connecting part 412, which is also arc-shaped and opens inward. The floating seat 19 is inserted into the floating groove 8 from the inside out. Two guide posts 9 are protruding inside the floating groove 8, and the extending direction of the guide posts 9 is the same as the sliding direction of the floating seat 19. Two guide grooves 10 are correspondingly provided on the floating seat 19, and the guide posts 9 are inserted into the guide grooves 10 to stabilize the floating seat 19. The sliding direction; a first spring 11 is sleeved on each of the two guide posts 9, and the two ends of the first spring 11 abut against the groove wall of the floating groove 8 and the groove wall of the guide groove 10 respectively, and the first spring 11 always provides the floating seat 19 with an elastic force away from the rotating base 61; a locking member 12 is also slidably provided on the floating seat 19, specifically, an installation groove 13 is opened on the floating seat 19, the locking member 12 is slidably installed in the installation groove 13, and the locking member 12 can slide out of the floating seat 19; a second spring 14 is provided between the locking member 12 and the floating seat 19, and the second spring 14 is located in the installation groove 13. The mounting groove 13 is located between two guide grooves 10, and the second spring 14 is located between two first springs 11. The second spring 14 always provides a spring force to the locking member 12 near the rotating base 61. The floating seat 19 has a stop boss 15 at the end of the mounting groove 13 near the rotating base 61. The locking member 12 is columnar and has a protruding ring 16. The two ends of the second spring 14 abut against the groove wall of the mounting groove 13 and the protruding ring 16 of the locking member 12, respectively. The protruding ring 16 also abuts against the stop boss 15, which is located between the protruding ring 16 and the rotating base 61. At the bottom of the floating groove 8 A through hole 17 is provided, which communicates with the floating groove 8. The locking member 12 is disposed in the through hole 17 and is exposed or retracted through the through hole 17 to the connecting part 412. A locking groove 18 is provided on the rotating base 61. There are three locking grooves 18, which are arranged at intervals along the circumference of the rotating base 61. The locking member 12 can enter the locking groove 18 to lock the connecting part 412 and the rotating base 61, thereby locking the rotation of the chair back and armrest 3. When the locking member 12 is inserted into the three locking grooves 18, it corresponds to the chair back being in a vertical state and two tilting states with different tilting angles.

[0073] Furthermore, the rotating device 6 also includes a control member 20. The rotating shaft 7 on the outer side of the connecting portion 412 is rotatably engaged with the rotating base 61, and the rotating shaft 7 on the inner side of the connecting portion 412 is rotatably engaged with the control member 20. Both the rotating base 61 and the control member 20 are rotatably provided with fixing plates. The fixing plates are circumferentially stationary with the rotating shaft 7 and are fixed by screws. The fixing plates restrict the rotating base 61 and the control member 20 to the rotating shaft 7 to prevent them from falling off, thereby increasing the connection stability between the rotating base 61, the control member 20, and the rotating shaft 7 and maintaining the relative rotation capability of the connecting portion 412 and the control member 20. The rotation of the control member 20 relative to the connecting portion 412 is used to control the sliding of the floating seat 19. Specifically, as... Figure 21-25 As shown, the floating seat 19 includes a head with an arc surface. A control section is provided on the side of the control member 20 facing the floating seat 19, extending along the rotation direction of the control member 20. The control section includes a disengagement section 201, an inclined section 202, and a locking section 203. The disengagement section 201 and the locking section 203 are located on opposite sides of the inclined section 202. From the disengagement section 201 to the locking section 203, the thickness of the inclined section 202 gradually increases, meaning the inclined section 202 gradually protrudes closer to the connecting part 412. The disengagement section 201 is farther from the connecting part 412 than the locking section 203, and the locking section 203 protrudes further towards the connecting part 412 than the disengagement section 201. Under the action of the first spring 11, the floating seat 19 floats towards the control section, ensuring that the head of the floating seat 19 always abuts against the control section. When the head of the floating seat 19 is located at the disengagement section 201, the first spring 11 is extended, and the floating seat 19 moves away from the control section. When the base 61 is rotated, the stop boss 15 is located between the convex ring 16 and the rotating base 61, so the stop boss 15 also moves the locking member 12 away from the locking groove 18. At this time, the chair back can rotate on the armrest 3. When the control member 20 rotates and the head moves close to the locking section 203 on the inclined section 202, the floating seat 19 is gradually pushed towards the rotating base 61, and the first spring 11 is gradually compressed. When the control member 20 rotates to the point where the head is located in the locking section 203, the locking member 12 engages with the locking groove 18. If the head is located in the locking section 203 and the locking member 12 is not aligned with the locking groove 18, the second spring 14 will be in a compressed state and maintain the elastic force on the locking member 12. The chair back only needs to be rotated again to align the locking member 12 with the locking groove 18. The locking member 12 will enter the locking groove 18 under the elastic force of the second spring 14, thereby achieving the effect of delayed locking and giving the tilting of the chair back a buffer locking capability.

[0074] A protrusion extending from the inclined section 202 and the locking section 203 is also provided between the inclined section 202 and the locking section 203 to prevent the head from sliding onto the inclined section 202 when locked on the locking section 203, thus causing the locking to fail. The control member 20 also includes a protruding handle 26 to facilitate the user to rotate the control member 20.

[0075] A slot is cut at the end of the rotating base 61 facing the connecting part 412, in which an alloy block 27 is fixedly installed. The locking groove 18 is formed on the alloy block 27 to increase the locking strength.

[0076] The rotating device 6 also includes a tilting elastic element 28, which is a torsion spring. The rotating base 61 has a slot at the end facing the connecting part 412. The two torsion arms of the torsion spring are fixed in the rotating base 61 and the connecting part 412 respectively. When the connecting part 412 and the chair back rotate, the torsion spring deforms and provides elastic force to return the chair back to the vertical position. Both the rotating base 61 and the connecting part 412 have slots to accommodate the torsion spring, so that the overall structure is more compact. In addition, a limiting screw 29 is fixed on the connecting part 412, and a limiting groove 30 is opened on the rotating base 61. The limiting screw 29 is connected to the connecting part 412 after passing through the limiting groove 30 to limit the tilting angle travel of the chair back.

Claims

1. A reclining seat, characterized in that: The chair includes a seat with armrests on both sides, each armrest extending rearward with an extension. A backrest is located between the two extensions. The backrest includes a back support and a rotating device. The back support has two connecting parts near the armrests, located at the left and right ends of the lower part of the back support. Each connecting part is equipped with the rotating device, which includes a rotating base. A forward-extending insert is fixedly connected to the rotating base. The insert on the same side is inserted and fixed to the extension. The backrest is rotatably configured relative to the armrests and seat via the rotating device. The connecting parts are rotatably connected to the rotating base, and the backrest rotates about the connecting axis between the left and right connecting parts and the rotating base. The extension is configured to move the rotation point of the backrest rearward. A locking assembly is also provided between the connecting parts and the rotating base. A control component that rotates coaxially with the connecting parts is provided on the connecting parts or the rotating base. The control component is configured to rotate to drive the locking assembly to lock or unlock the rotational movement of the connecting parts and the rotating base.

2. The reclining seat according to claim 1, characterized in that: The locking assembly includes a floating seat, a locking member, a locking groove, a first spring, and a second spring. The floating seat is slidably disposed on the connecting part, the locking groove is disposed on the rotating base, and the locking member is slidably disposed in the floating seat. The first spring is disposed between the floating seat and the connecting part and provides a spring force to the floating seat away from the locking groove. The second spring is disposed between the floating seat and the locking member and provides a spring force to the locking member toward the locking groove. When the control member rotates to make the floating seat slide toward the rotating base, the first spring is compressed, and the second spring is configured to make the locking member enter the locking groove when the locking member is aligned with the locking groove.

3. The reclining seat according to claim 2, characterized in that: The floating seat has a stop boss at the end near the rotating base. When the first spring extends, the floating seat slides away from the second component, and the stop boss drives the locking member to leave the locking groove. The floating seat has an installation groove, and the locking member is slidably installed in the installation groove. The second spring is set in the installation groove, and the stop boss is located at the end of the installation groove near the second component.

4. The reclining seat according to any one of claims 2, characterized in that: The locking element is cylindrical and has a raised ring. The two ends of the second spring abut against the groove wall of the mounting groove and the raised ring of the locking element, respectively. The stop boss is located between the raised ring and the rotating base.

5. The reclining seat according to claim 2, characterized in that: A floating groove is provided on the connecting part, and the floating seat is set in the floating groove.

6. The reclining seat according to claim 5, characterized in that: A guide post protrudes from the floating groove, and the extension direction of the guide post is the same as the sliding direction of the floating seat; a guide groove is correspondingly opened on the floating seat, and the guide post is inserted into the guide groove; a first spring is sleeved on the guide post, and the two ends of the first spring abut against the groove wall of the floating groove and the groove wall of the guide groove, respectively.

7. The reclining seat according to any one of claims 5, characterized in that: The connecting part is also provided with a through hole, which communicates with the floating groove. The locking element is set in the through hole and is exposed or retracted through the through hole.

8. The reclining seat according to claim 2, characterized in that: A control section is provided on the side of the control component facing the rotating component. The control section extends along the rotation direction of the control component and includes a disengagement section, an inclined section, and a locking section. The disengagement section and the locking section are located on both sides of the inclined section. From the disengagement section to the locking section, the inclined section protrudes near the rotating component, and the disengagement section is farther away from the rotating component than the locking section. The floating seat abuts against the control section under the action of the first spring. When the floating seat is located at the disengagement section, the locking member disengages from the locking groove. When the floating seat is located at the locking section, the locking member is inserted into the locking groove.

9. The reclining seat according to claim 8, characterized in that: There is also a protrusion between the inclined section and the locking section.

10. The reclining seat according to claim 8, characterized in that: The floating seat includes a head with an arcuate surface, and a control unit abuts against the head.

11. The reclining seat according to claim 1, characterized in that: The control also includes a raised handle.

12. The reclining seat according to claim 1, characterized in that: The armrest includes an armrest seat that is connected to the seat, with an extension extending rearward onto the armrest seat.

13. The reclining seat according to claim 12, characterized in that: The armrest includes a hollow sleeve portion, which is arranged vertically. An armrest moving component is installed inside the sleeve portion and is equipped with an arm support component at the upper end of the armrest moving component for supporting the human arm. An extension portion is provided on the sleeve portion extending backward, and the slot of the extension portion is open to the rear. The extension portion and the sleeve portion are T-shaped.

14. The reclining seat according to claim 1, characterized in that: The insert has an anti-detachment end located within the rotating base. The anti-detachment end includes a gap and two anti-detachment parts located on both sides of the gap. Each anti-detachment part has at least one protruding anti-detachment angle, which is hooked inside the rotating base.

15. The reclining seat according to claim 1, characterized in that: The insert and the extension are inserted into each other in the front-to-back direction and are fixedly connected by at least two screws.

16. The reclining seat according to claim 1, characterized in that: The insert is a metal plate.

17. The reclining seat according to claim 1, characterized in that: The support includes two L-shaped arms located at its lower part. The two arms are spaced apart and symmetrically arranged. Both arms extend downward first and then outward and forward. The connecting part is formed at the front end of the arm.

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