Chair capable of leaning backwards

Abstract

The chair comprises a front bracket, a rear bracket, supporting legs and a chair back frame, wherein the front bracket extends from back to front and is gradually lifted; the rear bracket is rotationally connected to the rear end of the front bracket; the supporting legs are fixedly connected to the bottom end of the front bracket; the base extends front and back, the front end of the base is rotatably connected with the front end of the front support, the sliding seat extends front and back, the rear end of the sliding seat is rotatably connected with the top end of the rear support, the chair seat is fixed to the sliding seat, and the sliding seat is connected to the base in a sliding mode so that the sliding seat can slide front and back along the base. The sliding seat and the chair seat synchronously slide backwards; and the elastic piece is connected with the base and the sliding seat, and the elastic force of the elastic piece acting on the sliding seat enables the sliding seat to have a moving trend of sliding forwards along the base. The chair provided by the invention has the beneficial effect that the problems of back rubbing and waist suspension caused by sliding of the back of a user on the chair back are solved.

Description

Technical Field

[0001] The present invention relates to a reclining chair, belonging to the technical field of chair products. Background Art

[0002] Currently, seats with reclining functions generally adopt a rotating shaft type or a single-degree-of-freedom hinge structure to achieve the reclining of the chair back. Most products are provided with a fixed rotation fulcrum in cooperation with elastic elements such as springs or pneumatic rods. When the user reclines, the chair back is allowed to rotate around the axis, and at the same time, a limited front-back displacement adjustment is achieved through a seat surface linkage mechanism.

[0003] However, the traditional reclining mechanism of the chair has significant ergonomic adaptation defects: First, during the reclining process of the chair back, the compensatory displacement of the seat surface is mismatched with the actual movement trajectory of the human back, resulting in forced frictional sliding between the user's clothing and the backrest support surface, generating an obvious "back rubbing feeling", especially prominent when the clothing is thicker in winter; Second, the existing backrest support surface cannot adaptively fit the lumbar curve during reclining, resulting in the attenuation of the support force in the lumbar region as the angle increases, forming a state of lumbar suspension. This support mismatch not only causes local pressure concentration but also forces the user to actively adjust the sitting posture to maintain comfort, which is likely to cause muscle fatigue and spinal burden after long-term use and becomes the core pain point restricting the comfort of the seat. Summary of the Invention

[0004] The purpose of the present invention is to provide a reclining chair. Through the synchronous linkage of the reclining rotation of the chair back and the backward sliding of the seat, during the reclining process of the user, the chair back provides active follow-up support for the back, thus effectively solving the problems of back rubbing caused by the sliding of the user's back on the chair back and the problem of lumbar suspension.

[0005] The present invention is realized by the following technical solutions.

[0006] A reclining chair includes a front bracket extending forward from back and gradually rising, a rear bracket rotatably connected to the rear end of the front bracket, a support leg fixedly connected to the bottom end of the front bracket, and a backrest frame fixedly connected to the rear side of the rear bracket; And, a base extending front and back and rotatably connected to the front end of the front bracket at its front end, a sliding seat extending front and back and rotatably connected to the top end of the rear bracket at its rear end, and a seat fixedly mounted on the sliding seat. The sliding seat is slidably connected to the base so that it can slide back and forth along the base. When the backrest frame reclines and rotates, the sliding seat and the seat slide backward synchronously; And, an elastic member connecting the base and the sliding seat. The elastic force of the elastic member acting on the sliding seat gives it a tendency to slide forward along the base.

[0007] As a further improvement of the present invention, a transmission assembly is provided on the sliding seat, and the transmission assembly transmits and connects the pull wire and at least one locking member positioned on the sliding seat, the locking member and the base are in contact and the contacting parts of the two respectively have mutually interlocking locking structures, the pull wire is connected to a control member located outside the sliding seat, and the operating member is manually controlled to lift the locking member relative to the sliding seat and separate the locking member and the base.

[0008] As a further improvement of the present invention, the transmission assembly includes a pulling member connected to a pulling wire, a lifting member movably connected to the pulling member, at least one rotating rod corresponding to a corresponding locking member, and a reset spring member. The movable connection of the lifting member on the pulling member is suitable for lifting the lifting member when the pulling member is pulled by the pulling wire. The rotating rod is provided with a first rocker rod and a second rocker rod which are respectively movably connected to the pulling member and the corresponding locking member, and the movable connection between the two is suitable for the lifting member to rotate the rotating rod around its own axis during the lifting movement, and to lift the locking member and separate it from the base. The reset spring member acts on the pulling member to reset its movement and to cause the locking member to fall and fit into the base.

[0009] As a further improvement of the present invention, a plurality of connecting parts are arranged on the sliding seat, a cover shell for covering the sliding seat is arranged on the base, a through groove extending in the front-to-back direction and allowing the connecting part to pass through is provided on the cover shell at a position corresponding to each connecting part, the seat is slidably connected to the cover shell so that it can slide forward and backward along the cover shell, and is fixedly connected to the connecting part.

[0010] As a further improvement of the present invention, the rear end of the through groove forms a limit end that abuts against the connecting piece to prevent the seat from moving backward, and the cover shell is slidably connected to the base so that it can slide forward and backward along the base, and a manually controlled locking assembly is provided between the cover shell and the base, so that the cover shell and the base are locked to each other or the cover shell is allowed to slide forward and backward on the base, which is used to adjust the front and rear position of the limit end to limit the maximum reclining angle of the chair back frame.

[0011] As a further improvement of the present invention, the locking assembly includes a locking plate arranged on the side of the base and a locking wrench movably connected to the side of the cover shell, the locking plate has a plurality of locking grooves arranged continuously in the front-to-back direction, and the locking wrench is provided with a locking head, so that the locking head of the locking wrench can be inserted into the corresponding locking groove under manual adjustment to lock the cover shell and the base to each other, or be separated from the locking groove to allow the cover shell to slide relatively forward and backward on the base.

[0012] As a further improvement of the present invention, the housing has a lip formed at a position corresponding to each through groove and restricting the opposite through groove and the connecting member therein, and the portions of the lip corresponding to both sides of the through groove extend in the front-rear direction. The bottom of the seat has a sliding groove formed by recessing at a position corresponding to each lip and extending in the front-rear direction, and the lip is slidably fitted in the corresponding sliding groove.

[0013] As a further improvement of the present invention, a front positioning frame is provided in the front region of the base, a rear positioning frame is provided in the rear region of the sliding seat, and a plurality of elastic members are provided and arranged at intervals in the left-right direction, and their front ends and rear ends are respectively fixed to the front positioning frame and the rear positioning frame.

[0014] As a further improvement of the present invention, positioning rods extending in the left-right direction and a plurality of separating teeth spaced axially along the positioning rods are respectively provided on the positioning frame and the rear positioning frame. The front and rear ends of the plurality of elastic members are respectively fixed to the corresponding positioning rods on the positioning frame and the rear positioning frame and are separated by the separating teeth in the left-right direction.

[0015] As a further improvement of the present invention, two side portions of the sliding seat respectively have sliding rails protruding outward and extending in the front-rear direction. The base has a surrounding edge portion formed by turning up on both sides thereof, and an inwardly concave and front-rear extending sliding groove is formed on the inner side of the surrounding edge portion. The two sliding rails are respectively in sliding fit with the two corresponding sliding grooves.

[0016] Advantages of the present invention: When the user reclines backward, while the rear bracket drives the backrest frame to recline and rotate, the sliding seat synchronously and smoothly displaces backward along the base, so that the seat moves backward accordingly to form a compensation movement synchronous with the downward movement trend of the human back. This dynamic coupling mechanism enables the lumbar support area to always fit the human body curve. The backward displacement amount of the seat precisely matches the physiological displacement requirement of the lumbar region when the user reclines backward, continuously maintaining the effective support of the lumbar vertebra during the change of the backrest angle and avoiding the fatigue caused by the suspension of the lumbar region of the traditional reclining chair. The forward pre-tightening force applied by the elastic member forms a dynamic balance with the backward movement of the human body, which not only ensures the smoothness of the seat movement but also realizes the self-resetting function through elastic energy storage, enabling the support system to have the active following characteristic of real-time responding to the change of the body posture. Since the linked displacement of the seat and the backrest precisely cancels the relative sliding trend between the human body and the seat surface, the frictional displacement between the support surface and the clothing is completely eliminated during the backward reclining of the backrest, and the contact surface between the clothing fiber and the backrest remains relatively stationary, achieving the comfortable experience of "zero rubbing on the back". The whole mechanical composition takes into account the accuracy of the dynamic support of the lumbar region and the reliability of the mechanism operation. Description of the drawings

[0017] The following will describe in detail the preferred embodiments of the present invention with the help of the drawings to facilitate understanding of the purpose and advantages of the present invention, wherein: Figure 1 It is a schematic structural diagram of a chair; Figure 2 It is a schematic structural diagram of a base, a sliding seat and a seat; Figure 3 It is a schematic structural diagram of a base and a sliding seat; Figure 4 It is an exploded schematic diagram of a base, a sliding seat and a housing; Figure 5 It is a schematic structural diagram of a sliding seat and a transmission assembly; Figure 6 It is a schematic structural diagram of a transmission assembly; Figure 7 It is a schematic structural diagram of a base; Figure 8 It is a schematic structural diagram of a housing and a sliding seat; Figure 9 It is a schematic structural diagram of the bottom surface of the seat. Detailed implementation manners

[0018] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0019] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined with respect to the structures shown in the respective drawings. The terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0020] A reclining chair, referring to Figures 1-9 , includes a front bracket 5, a rear bracket 6, support legs (not shown in the figure) and a backrest bracket 4. Among them, the front bracket 5 extends forward from the rear and gradually rises. The bottom of the rear bracket 6 is rotatably connected to the rear end of the front bracket 5. The rear bracket 6 has two branch parts, one of which extends upward and the other extends backward. The top of the support leg is fixed to the bottom end of the front bracket 5. The backrest bracket 4 is fixed to the branch part of the rear bracket 6 that extends backward, that is, fixed to the rear side of the rear bracket 6. A backrest is provided on the backrest bracket 4, and structures such as a lumbar support can be added according to the type of the configured backrest.

[0021] The chair of this embodiment also includes a base 1, a sliding seat 2, a seat 3 and an elastic member s, wherein the front end of the base 1 is rotatably connected to the front end of the front bracket 5, the rear end of the sliding seat 2 is rotatably connected to the top of the rear bracket 6, the base 1 and the sliding seat 2 are both structures extending forward and backward, and the sliding seat 2 is slidably connected to the base 1 so that it can slide forward and backward along the base 1, and the seat 3 is fixed to the sliding seat 2, so that when the chair back frame 4 is tilted back and rotated, the sliding seat 2 and the seat 3 slide backward synchronously. The elastic member s connects the base 1 and the sliding seat 2, and the elastic force of the elastic member s on the sliding seat 2 makes it have a movement tendency to slide forward along the base 1.

[0022] In this embodiment, when the user leans back, the rear bracket 6 drives the chair back frame 4 to rotate backward, while the sliding seat 2 simultaneously and smoothly moves backward along the base 1, so that the seat 3 moves backward to form a compensatory movement synchronized with the downward movement trend of the human back. This dynamic coupling mechanism ensures that the lumbar support area always fits the human body curve, and the backward movement of the seat 3 accurately matches the physiological displacement requirements of the user's waist when leaning back, and continuously maintains effective support for the lumbar spine during the change of the chair back angle, avoiding the fatigue caused by the waist hanging in the air in traditional reclining chairs. The forward preload applied by the elastic member s forms a dynamic balance with the backward movement of the human body, which not only ensures the smoothness of the movement of the seat 3, but also realizes the self-reset function through elastic energy storage, so that the support system has the active tracking characteristics of real-time response to changes in body posture. Since the linkage displacement between the seat 3 and the chair back accurately offsets the relative sliding tendency between the human body and the chair surface, the friction displacement between the supporting surface and the clothing is completely eliminated during the reclining process of the chair back, and the contact surface between the clothing fibers and the chair back remains relatively static, achieving a comfortable experience of "zero back rubbing". The entire mechanical composition takes into account both the accuracy of dynamic lumbar support and the reliability of the mechanism operation.

[0023] In this embodiment, a transmission assembly is provided on the sliding seat 2, and the transmission assembly transmits and connects the pull wire 72 and at least one locking member 71 positioned on the sliding seat 2, and the locking member 71 and the base 1 are attached, and the portions where the two are attached have mutually engaged locking structures 7a. The locking member 71 is a plate-like structure and extends in the front-back direction. The sliding seat 2 is provided with a hollow area 23 at the portion corresponding to the locking member 71, so that the locking member 71 is positioned in the hollow area 23. The locking structure 7a is specifically configured as a row of teeth formed on the bottom surface of the locking member 71 and a corresponding layer of teeth formed on the surface of the base 1. The pull wire 72 is connected to a control component (not shown in the figure) located outside the sliding seat 2, and the manual operation component lifts the locking member 71 relative to the sliding seat 2 and separates the locking member 71 from the base 1. More specifically, the control component is configured as a wrench structure, and the user realizes the pulling of the pull wire 72 on the transmission assembly by bending it.

[0024] By introducing a manually controllable control component, the accuracy and safety of the dynamic adjustment of the seat are significantly enhanced. When the user reclines to the target angle, the locking member 71 is triggered to lift by pulling the control component through the cable 72, so that the locking structure 7a between the sliding seat 2 and the base 1 is disengaged. At this time, the pre-tightening force of the elastic member s is released, and the seat 3 can slide freely at any position; when the locking member 71 is re-engaged with the base 1 through the locking structure 7a, the position of the sliding seat 2 is instantaneously fixed, thus locking the reclining angle. First of all, the design of the locking structure 7a enables the sliding seat 2 to achieve mechanical interlocking at any discrete or continuous position on the guide rail of the base 1. The user can accurately lock the optimal support position according to their body shape characteristics, avoiding the support displacement deviation caused by individual weight differences in the traditional elastic reset mechanism; secondly, the rigid constraint in the locked state completely eliminates the safety hazard of accidental sliding of the seat 3, and a stable working posture can be maintained in the office scenario, while retaining the possibility of freely adjusting the reclining angle; furthermore, the combined action of the biting and separating action at the moment of unlocking and the energy storage characteristics of the elastic member s makes the locking / unlocking switching process of the seat 3 smooth without jamming, and the operating force is ergonomically adapted, and the state can be switched with one hand.

[0025] In this embodiment, the transmission assembly includes a pulling member 73 connected to the cable 72, a lifting member 74 movably connected to the pulling member 73, at least one rotating rod 75 corresponding to the locking member 71, and a reset spring member 76. Among them, the movable connection of the lifting member 74 on the pulling member 73 is adapted to enable the lifting member 74 to lift when the pulling member 73 is pulled by the cable 72. More specifically, when the pulling member 73 is pulled by the cable 72, it can move in the left-right direction. The pulling member 73 is provided with a slot 731 inclined to the left-right direction and the vertical direction. The lifting member 74 is clamped in a receiving slot 13 provided on the base 1 to limit its horizontal movement. The lifting member 74 has a pin 741 inserted into the slot 731, so that when the pulling member 73 moves left and right, the pin 741 slides along the slot 731, thereby driving the lifting member 74 to lift upward. The rotating rod 75 is provided with a first swing rod 751 and a second swing rod 752 which are respectively movably connected to the pulling member 73 and the corresponding locking member 71, and their movable connection is adapted to enable the rotating rod 75 to rotate around its own axis when the lifting member 74 moves up and down, and to lift the locking member 71 and separate it from the base 1. The reset spring member 76 acts on the pulling member 73 to move it back to its original position and make the locking member 71 fall and fit with the base 1. More specifically, a slot 742 extending in the left-right direction is provided at the part of the lifting member 74 corresponding to the first swing rod 751. A pin 7511 is provided on the first swing rod 751 and inserted into the slot 742. A slot 711 is provided at the part of the locking member 71 corresponding to the second swing rod 752, and the second swing rod 752 is inserted into the slot 711, thereby realizing the rotation of the rotating rod 75 around its axis to drive the lifting and falling of the locking member 71.

[0026] Furthermore, two locking members 71 are provided and are respectively provided on the left and right sides of the sliding seat 2. Accordingly, two rotating rods 75 are provided and are respectively movably connected to the left and right sides of the lifting member 74. The structure formed by the two sets of rotating rods 75 and the corresponding locking members 71 is in a bilaterally symmetrical structural relationship on the sliding seat 2. The configuration of the double-sided locking members 71 and the symmetrical distribution can form a force couple balance, eliminate the eccentric load wear caused by the unilateral stress concentration, ensure that the locking posture of the sliding seat 2 has no lateral deviation through the double-sided synchronous meshing, and improve the durability and position retention accuracy.

[0027] The transmission component realizes efficient and precise control and stable self-reset function of the locking member 71 and the base 1 through a multi-stage mechanical transmission mechanism, further optimizing the operation feel and reliability. Specifically: the force transmission of the multi-component pulling member 73, the lifting member 74 and the rotating rod 75 improves the smoothness of operation. When the pull wire 72 is pulled, the rocker mechanism composed of the lifting member 74 and the rotating rod 75 converts the linear traction force into a multi-directional force. The lever action of the first rocker 751 and the second rocker 752 amplifies the operating torque, significantly reduces the hand force required for unlocking, and realizes the switching of the locking state with a single touch of the hand; the precise constraint of the motion trajectory of the transmission component enhances the locking stability, and the mechanical constraint of the rotation of the rotating rod 75 around the axis ensures that the locking member 71 maintains a vertical lifting trajectory during the lifting process, avoiding the deflection and jamming that may occur in the traditional straight-pull unlocking, so that the locking structure 7a and the base 1 The separation action is more thorough, eliminating the risk of misoperation; the dual action mechanism of the reset rebound member 76, when the user manually releases the control component, the reset rebound member 76 not only drives the pulling member 73 to reset, but also synchronously presses down the locking member 71 through the lever reaction force of the rotating rod 75, ensuring that the locking structure 7a is quickly and accurately reset and engaged, and the engagement process achieves a close fit of the contact surface through the dual support of gravity and elastic force; dynamic stress dispersion improves durability, the hinge design of the lifting member 74 and the rotating rod 75 disperses the operating force to multiple fulcrums, reducing the force strength of a single component, and the kinematic characteristics of the rocker mechanism effectively absorb the operating impact, preventing the locking structure 7a from deformation or wear due to frequent use.

[0028] In this embodiment, a plurality of connecting members 21 are provided on the sliding seat 2, and a housing 8 that shields the sliding seat 2 is provided on the base 1. Through slots 81 extending in the front-rear direction and allowing the connecting members 21 to pass through are provided on the housing 8 at positions corresponding to each of the connecting members 21. The seat 3 is slidably connected to the housing 8 so that it can slide back and forth along the housing 8, and is fixedly connected to the connecting members 21. A plurality of connecting members 21 are provided and are evenly arranged on the side of the sliding seat 2. The provision of the housing 8 achieves a fully enclosed shielding of the mechanical moving part of the sliding seat 2. While maintaining the normal displacement function of the sliding seat 2, the housing 8 forms a dust-proof barrier to block the intrusion of external dust, significantly reducing mechanical wear and extending the service life of the mechanism; the additional sliding connection points between the housing 8 and the seat 3 disperse the bearing stress, suppressing mechanism tremors and operating noise.

[0029] In this embodiment, a limiting end 811 that abuts against the connecting member 21 to prevent the seat 3 from moving backward is formed at the rear end of the through slot 81. The housing 8 is slidably connected to the base 1 so that it can slide back and forth along the base 1, and a manually controlled locking assembly is provided between the housing 8 and the base 1. By manually controlling the locking member, the user can lock the housing 8 and the base 1 to each other or allow the housing 8 to slide back and forth on the base 1, thereby adjusting the front-rear position of the limiting end 811, and then being able to limit the maximum distance that the sliding seat 2 slides backward relative to the base 1, and correspondingly being able to limit the maximum reclining angle of the backrest frame 4.

[0030] Through the deep coupling of the locking mechanism and the limit adjustment function of the locking component between the housing 8 and the base 1, the full-degree-of-freedom control of the user in the rocking mode of the chair and the personalized adaptation of the reclining amplitude are realized. When the user operates the unlocking part to unlock the locking part 71, the backrest frame 4 is released from the rigid constraint with the sliding seat 2, and the backrest can swing freely at multiple angles relying on the energy storage characteristics of the elastic part s to form a stepless variable-speed rocking function; at the same time, the user adjusts the front-back position of the limit end 811 by sliding the housing 8 to directly control the maximum rearward movement stroke of the connecting part 21 in the through slot 81, thereby physically limiting the swing amplitude threshold of the backrest frame 4 - when the limit end 811 moves forward, the rocking reclining angle is reduced to adapt to the focused office scenario; when the limit end 811 moves backward, the swing amplitude is enlarged to meet the deep relaxation needs. This linkage design endows the rocking function with the dual characteristics of precise controllability of both dynamic freedom and safety boundary: the resilience provided by the elastic part s gives the rocking action a natural and smooth damping feeling, while the mechanical hard stop of the limit end 811 completely eliminates the risk of excessive reclining caused by inertia in traditional rocking chairs. More importantly, the decoupling operation mechanism of the limit adjustment and the rocking mode enables the user to observe and calibrate the angle threshold in real time without interrupting the current usage state during the process of customizing the reclining amplitude, only by sliding the housing 8 with one hand, and the meshing accuracy of the locking component ensures that the adjusted limit position does not shift under repeated rocking actions, deeply integrating dynamic comfort, safety redundancy and user control. On the basis of maintaining the "zero back rubbing" lumbar support, through the synergistic effect of mechanical limit and elastic system, the rocking function has achieved a leapfrog upgrade from a fixed mode to an adjustable one.

[0031] In this embodiment, the locking component includes a locking plate 11 arranged on the side of the base 1 and a locking wrench 82 movably connected to the side of the housing 8. The locking plate 11 has a plurality of locking grooves 111 arranged continuously in the front-back direction. A locking head 821 is arranged on the locking wrench 82, so that the locking head 821 is inserted into the corresponding locking groove 111 under manual control of the locking wrench 82 to lock the housing 8 and the base 1 to each other, or separated from the locking groove 111 to allow the housing 8 to slide relatively back and forth on the base 1. In addition, a return spring is configured in the locking wrench 82 so that its rotation and reset only make the locking head 821 inserted into the locking groove 111.

[0032] A plurality of locking grooves 111 arranged continuously in the front and rear on the locking plate 11 form discrete gear scale marks. The user can quickly insert and connect the locking head 821 with the target slot by pulling the locking wrench 82, realizing the locking of the position of the housing 8 and ensuring the angle limit accuracy. The lever - type operating arm of the locking wrench 82 amplifies and transmits the hand pressing force to the locking head 821, making the plug - in and unplugging operations light and labor - saving. Moreover, the pre - tightening force design of the return spring of the locking wrench 82 ensures that the locking head 821 automatically rebounds to a safe position after disengaging from the slot. This structure converts the complex reclining amplitude adjustment into an intuitive three - step operation of "pull - slide - lock", endowing the user with the ability of fine - control over the rocking function of the seat while retaining the reliability of the all - mechanical transmission.

[0033] In this embodiment, the housing 8 has a lip 83 formed by a protrusion at the position corresponding to each through - slot 81, and the lip 83 limits the opposite through - slot 81 and the connecting member 21 therein. The parts of the lip 83 corresponding to both sides of the through - slot 81 extend in the front - rear direction. The bottom of the seat 3 has a sliding groove 31 formed by a concave and extending in the front - rear direction at the position corresponding to each lip 83. The lip 83 is slidably embedded in the corresponding sliding groove 31.

[0034] The fitting of the lip 83 and the sliding groove 31 constitutes a guiding structure for the seat 3. The lip 83 and the sliding groove 31 form multi - directional limiting constraints, eliminating the risk of lateral offset or overturning of the seat 3, ensuring the linearity of the sliding track. The sliding contact surface between the inner wall of the sliding groove 31 and the lip 83 disperses the load of the seat 3, reducing the shear stress of the connecting member 21 and improving the structural durability. In addition, the lip 83 can effectively isolate foreign objects from invading the fitting gap between the connecting member 21 and the through - slot 81, playing a protective role at the fixed connection part between the connecting member 21 and the bottom of the seat 3.

[0035] In this embodiment, a front positioning frame 91 is provided in the front region of the base 1, a rear positioning frame 92 is provided in the rear region of the sliding seat 2, and a plurality of elastic members s are arranged at intervals left and right. Their front ends and rear ends are respectively fixed on the front positioning frame 91 and the rear positioning frame 92. More specifically, the positioning frame and the rear positioning frame 92 are respectively provided with a positioning rod 9a extending in the left - right direction and a plurality of separating teeth 9b spaced axially along the positioning rod 9a. The front and rear ends of the plurality of elastic members s are respectively provided with positioning rings or positioning hooks. The elastic members s are fixed on the corresponding positioning rods 9a of the positioning frame and the rear positioning frame 92 by a sleeving method, and the plurality of elastic members s are separated left and right by the separating teeth 9b, so that adjacent elastic members s do not interfere with each other.

[0036] The frame composed of the positioning rod 9a and the separation teeth 9b fixes multiple elastic parts s at intervals on the left and right, forming a distributed load sharing, reducing the risk of single-point stress concentration, ensuring that the deformation of each elastic part s is consistent, and avoiding fluctuations in the supporting force; the front and rear extension and contraction of the elastic part s is strictly limited in the axial direction, maintaining the precise correspondence between the sliding trajectory of the seat 3 and the inclination angle of the chair back. The gap design of the separation teeth 9b not only prevents the elastic parts s from rubbing against each other, but also reduces operating noise by breaking up the resonant frequency. The plug-in structure of the front and rear positioning frames 92 allows for quick disassembly and assembly of individual elastic parts s, and damaged components can be replaced without overall disassembly. The number and stiffness of the elastic parts s can be flexibly adjusted. By adding, subtracting or replacing components of different specifications, the lumbar support needs of users of different weights can be adapted, while maintaining the dynamic compensation function while enhancing the adaptability and durability of the system.

[0037] In this embodiment, the two sides of the sliding seat 2 are provided with slide rails 22 protruding outward and extending in the front-to-back direction, and the base 1 is provided with an upwardly turned-up surrounding edge 13 on both sides, and a slide groove 12 is formed on the inner side of the surrounding edge 13, which is concave inward and extends forward and backward. The two slide rails 22 are respectively slidably matched with the two corresponding slide grooves 12. The symmetrical matching design of the double-sided slide rails 22 and the slide groove 12 improves the stability and durability of the sliding mechanism. The concave-convex fitting of the slide rail 22 and the slide groove 12 forms a double guide constraint, which effectively suppresses the left-right deviation and overturning tendency of the sliding seat 2, and ensures the linear accuracy of the rearward movement trajectory of the seat 3; the folding structure of the surrounding edge 13 not only enhances the lateral rigidity of the base 1, but also utilizes the contact surface between the inner wall of the slide groove 12 and the slide rail 22 to disperse the sliding friction stress and reduce the single-point wear rate; the closed design of the slide groove 12 prevents external dust from entering the sliding surface, reduces the risk of track jamming, and cooperates with the continuous extension characteristics of the slide rail 22 to maintain long-term smoothness. The bilaterally symmetrical force-bearing mechanism avoids deformation of the mechanism caused by unilateral overload and prolongs the overall service life.

[0038] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A reclining chair, characterized in that: It comprises a front support (5) extending from the back to the front and gradually rising, a rear support (6) rotatably connected to the rear end of the front support (5), a support leg fixedly connected to the bottom end of the front support (5), and a chair back frame (4) fixedly connected to the rear side of the rear support (6); and a base (1) extending forward and backward and having its front end rotatably connected to the front end of a front bracket (5), a sliding seat (2) extending forward and backward and having its rear end rotatably connected to the top end of a rear bracket (6), and a seat (3) fixed to the sliding seat (2), wherein the sliding seat (2) is slidably connected to the base (1) so that it can slide forward and backward along the base (1), so that when the chair back frame (4) is tilted back and rotated, the sliding seat (2) and the seat (3) slide backward synchronously; And, an elastic member (s) connecting the base (1) and the sliding seat (2), wherein the elastic force of the elastic member (s) acting on the sliding seat (2) causes the sliding seat (2) to have a movement tendency to slide forward along the base (1).

2. The reclining chair according to claim 1, characterized in that: The sliding seat (2) is provided with a transmission assembly, the transmission assembly transmits and connects a pull wire (72) and at least one locking member (71) positioned on the sliding seat (2), the locking member (71) and the base (1) are fitted together, and the fitting parts of the two have mutually engaging locking structures (7a), the pull wire (72) is connected to an operating member located outside the sliding seat (2), and the operating member is manually controlled to lift the locking member (71) relative to the sliding seat (2), thereby separating the locking member (71) and the base (1).

3. The reclining chair according to claim 2, characterized in that: The transmission assembly comprises a pulling member (73) connected to a pulling wire (72), a lifting member (74) movably connected to the pulling member (73), at least one rotating rod (75) corresponding to a corresponding locking member (71), and a reset spring member (76). The movable connection of the lifting member (74) on the pulling member (73) is suitable for lifting the lifting member (74) when the pulling member (73) is pulled by the pulling wire (72). The rotating rod (75) is provided with a first swing rod (751) and a second swing rod (752) which are respectively movably connected to the pulling member (73) and the corresponding locking member (71). The movable connection between the two is suitable for rotating the rotating rod (75) around its own axis when the lifting member (74) is lifted and moved, so that the locking member (71) is lifted and separated from the base (1). The reset spring member (76) acts on the pulling member (73) to reset its movement and cause the locking member (71) to fall and fit with the base (1).

4. The reclining chair according to claim 1, characterized in that: The sliding seat (2) is provided with a plurality of connecting members (21), the base (1) is provided with a cover shell (8) for covering the sliding seat (2), the cover shell (8) is provided with a through slot (81) extending in the front-to-back direction and allowing the connecting member (21) to pass through at a position corresponding to each connecting member (21), the seat (3) and the cover shell (8) are slidably connected so that they can slide forward and backward along the cover shell (8), and are fixedly connected to the connecting member (21).

5. The reclining chair according to claim 4, characterized in that: The rear end of the through slot (81) forms a limit end (811) that abuts against the connecting piece (21) to prevent the seat (3) from moving backwards. The cover shell (8) is slidably connected to the base (1) so that it can slide forward and backward along the base (1), and a manually controlled locking component is provided between the cover shell (8) and the base (1) so that the cover shell (8) and the base (1) are locked to each other or the cover shell (8) is allowed to slide forward and backward on the base (1), so as to adjust the front and rear position of the limit end (811) to limit the maximum reclining angle of the chair back frame (4).

6. The reclining chair according to claim 5, characterized in that: The locking assembly comprises a locking plate (11) arranged on the side of the base (1), and a locking wrench (82) movably connected to the side of the cover shell (8), wherein the locking plate (11) has a plurality of locking grooves (111) arranged continuously in the front-to-back direction, and the locking wrench (82) is provided with a locking head (821), so that the locking wrench (82) is manually adjusted so that the locking head (821) is inserted into the corresponding locking groove (111) to lock the cover shell (8) and the base (1) to each other, or is separated from the locking groove (111) to allow the cover shell (8) to slide relatively forward and backward on the base (1).

7. The reclining chair according to claim 5, characterized in that: The cover shell (8) has a lip (83) at a position corresponding to each through groove (81) and is formed in a convex manner and limits the relative through groove (81) and the connecting piece (21), and the lip (83) extends in the front-to-back direction at the portions on both sides corresponding to the through groove (81). The bottom of the seat (3) has a sliding groove (31) at a position corresponding to each lip (83) and is formed in a concave manner and extends in the front-to-back direction, and the lip (83) is slidably embedded in the corresponding sliding groove (31).

8. The reclining chair according to claim 1, characterized in that: A front positioning frame (91) is provided in the front area of ​​the base (1), a rear positioning frame (92) is provided in the rear area of ​​the sliding seat (2), a plurality of elastic members (s) are provided and arranged at intervals on the left and right, and the front and rear ends of the elastic members (s) are respectively fixed on the front positioning frame (91) and the rear positioning frame (92).

9. The reclining chair according to claim 8, characterized in that: The positioning frame and the rear positioning frame (92) are respectively provided with a positioning rod (9a) extending in the left-right direction, and a plurality of separation teeth (9b) spaced axially along the positioning rod (9a); the front and rear ends of the plurality of elastic members (s) are respectively fixed on the corresponding positioning rods (9a) of the positioning frame and the rear positioning frame (92), and are spaced apart from each other in the left and right directions by the separation teeth (9b).

10. The reclining chair according to claim 1, characterized in that: The two side portions of the sliding seat (2) respectively have sliding rails (22) protruding outward and extending in the front-to-back direction, and the base (1) has an upwardly turned-up peripheral edge portion (13) on both sides thereof, and a sliding groove (12) recessed inward and extending front-to-back is formed on the inner side of the peripheral edge portion (13), and the two sliding rails (22) are respectively slidably matched with the two corresponding sliding grooves (12).

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