A chair that can swing left and right

Abstract

The present invention discloses a chair that can swing left and right, comprising a chair foot frame supported on the ground, a tray connected to the top of the chair foot frame, and a chair back connected to the rear end of the tray; a fixed seat is fixedly connected to the top of the tray; the fixed seat is provided with a rotating shaft extending in the front-to-back direction and penetrating the front and rear side walls thereof; a seat is provided above the fixed seat, and the front and rear ends of the seat are respectively fixedly connected to the front and rear ends of the rotating shaft; armrest frames are fixedly connected on both sides of the fixed seat, avoiding the left and right swing range of the seat and extending upward; the armrest frames are higher than the top of the seat and are provided with an armrest structure for supporting the arms. The beneficial effect of the present invention is that the left and right swing function is separated from the tray, making the chair structure more reasonable and improving the stability of the swing.

Description

Technical Field

[0001] The present invention relates to a chair, in particular to a chair which can swing left and right. Background Art

[0002] In the prior art, the vast majority of chairs with trays (including office chairs and leisure chairs) have the function of swinging the seat left and right achieved through the tray. Some chairs can also tilt forward and backward, which is also achieved through the tray. That is, the chair integrates the functions of swinging left and right and tilting forward and backward into the tray.

[0003] For example, patent application publication number CN110313742A discloses a seat support structure comprising a tray bracket and a seat plate mounted on the tray bracket, with a swing assembly disposed between the tray bracket and the seat plate. The swing assembly is characterized in that: the swing assembly comprises an upper base plate and a lower base plate disposed vertically, the upper base plate being fixedly connected to the bottom of the seat plate, and the lower base plate being fixedly connected to the top of the tray bracket; an elastic member and a plurality of connecting members are disposed between the upper and lower base plates; the upper end of the connecting member penetrates the upper base plate and restricts upward movement of the upper base plate, the lower end of the connecting member penetrates the lower base plate and restricts downward movement of the lower base plate, and the plurality of connecting members are disposed in a straight line front to back, and the elastic member is disposed around the connecting member. The swing assembly of the seat support structure is provided with a plurality of connecting members disposed in a straight line front to back, which enables the seat to swing left and right, and constrains the seat from swinging forward and backward, thereby reducing the seat's forward and backward swinging. The support structure disclosed in this patent can realize the left and right swing of the seat (seat plate). Although the amplitude of the front and rear swing can be reduced by setting the connecting parts, it will still cause the left and right swing of the seat to be unstable, resulting in a poor user experience. In addition, a small swing in the front and rear direction will produce a shaking feeling, which can easily frighten the user.

[0004] For example, the patent application with publication number CN110710815A discloses a dynamic pallet, comprising: a first base; a second base connected to the first base for left and right rotation; a first crank, one end of the first crank is hinged to the first base; the other end of the first crank is hinged to an elastic transfer connector, and the elastic transfer connector is used to connect to the seat support; a second crank, both ends of the second crank are respectively hinged to the second base and the receiving member, the receiving member is rigid, and the receiving member is used to connect to the seat support, and the receiving member is located at the upper end of the second base; a rocker, configured to connect the chair back assembly, and the rocker is connected to the second crank as a whole; an elastic reset device, used to enable the rocker to pry the second crank to move so that the second crank can return to its original position.

[0005] This patent application utilizes a four-bar linkage principle. The gravity exerted by the human body on the support member and the driving force of the seesaw form an antagonistic relationship and achieve a relative balance. Therefore, the chair backrest's reclining force can be adjusted accordingly to the human body's weight. The application also provides a left-right tilt and swing function, automatically adapting to the user's forward and backward tilting and left-right swinging sitting posture changes. In this patent application, the left-right swinging and forward-back tilting functions are all integrated into the dynamic tray. Limited by the tray's size, the spatial arrangement of the seat support, second base, support member, and second crank that enable left-right swinging is significantly restricted, resulting in a limited range of left-right swinging. The strength of these components, as well as the overall strength of the assembled structure, is also relatively weak due to the tray's size limitations. After prolonged use, the structure is prone to bending and deformation, leading to structural damage.

[0006] The left and right swinging of this patent application is achieved through a four-bar linkage structure, and by setting a swing reset mechanism with a spring, the elasticity generated during the swinging gradually increases the resistance and plays a reset role. However, the elastic modulus of the swing reset mechanism cannot be changed, that is, the overall flexibility during the left and right swinging cannot be adjusted by adjusting the overall hardness of the swing reset mechanism, which is defective in optimizing the user experience.

[0007] Although the patent does not mention the armrests of the chair, the context of the patent and the accompanying drawings indicate that the armrests of the chair can only be fixedly connected to the tray or seat. Therefore, when the seat swings left and right, the armrests of the chair also swing with the same amplitude. Since the overall flexibility during the swinging cannot be adjusted, the user's arms are usually supported on the armrests when sitting upright. If the flexibility is high, the sudden swinging speed of the seat when swinging left and right will cause the user to feel scared, and the overall center of gravity of the user's upper body will deviate from the range of the seat, which can easily cause the user to fall, thus posing a certain safety hazard.

[0008] In addition, the forward and backward tilting of this patent is achieved through the chair back, and the chair seat does not have the function of forward and backward tilting.

[0009] For example, patent application publication number CN111904196A discloses a chair and its rocking tray, comprising a second rocking mechanism and a first rocking mechanism. The first rocking mechanism comprises a first base, two first spring assemblies, and a first connecting shaft. The first base is fixedly connected to the seat, one end of the first spring assembly is connected to the first base and the other end is connected to the second rocking mechanism. The first connecting shaft is fixedly connected to the first base and is rotatably mounted on the second rocking mechanism along the X-axis. The first base is mounted on the second rocking mechanism so as to be rockable left and right via the first connecting shaft. This patent application adds a first rocking mechanism that can rock left and right to the existing second rocking mechanism that can tilt forward and backward, and this added first rocking mechanism does not interfere with the internal structure of the second rocking mechanism. In other words, the rocking and tilting functions are fully integrated into the tray. This results in a more complex structure within the tray and a more compact spatial layout, which reduces the amplitude of the rocking and tilting functions and also affects the structural strength of the first and second rocking mechanisms. The first rocking mechanism that achieves left and right rocking in this application also suffers from the problems mentioned in CN110710815A. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a chair that can swing left and right, and separate the left and right swinging function from the tray, so that the structure of the chair is more reasonable and the swinging stability is improved.

[0011] The present invention is achieved through the following technical solutions.

[0012] A chair that can swing left and right, comprising a chair foot frame supported on the ground, a tray connected to the top of the chair foot frame, and a chair back connected to the rear end of the tray; a fixed seat is fixedly connected to the top of the tray; the fixed seat is provided with a rotating shaft extending in the front-to-back direction and passing through the front and rear side walls thereof, a seat is provided above the fixed seat, and the front and rear ends of the seat are respectively fixedly connected to the front and rear ends of the rotating shaft; armrest frames are fixedly connected to both sides of the fixed seat, avoiding the left and right swing range of the seat and extending upward, and the armrest frames are higher than the top of the seat and are provided with an armrest structure for supporting the arms.

[0013] In the present application, by setting a fixed seat and a rotating shaft, the left and right swinging function is separated from the tray and set independently. On the one hand, the structural setting inside the tray can be simplified (regardless of whether the tray has the function of tilting forward and backward). On the other hand, the fixed seat and the tray are independent of each other, so that the two actions of left and right swinging and tilting forward and backward can exist at the same time without any risk of mutual interference.

[0014] When the seat swings left and right around the axis of rotation, the foot frame, tray, armrest frame, and backrest are all stationary, that is, except for the seat, the rest of the chair components are all stationary. When the user's arms are supported on the armrest structure, the overall center of gravity of the user's upper body will not deviate from the range of the seat, avoiding the user from feeling frightened and causing safety hazards.

[0015] As a further improvement of the present invention, the part of the rotating shaft close to the rear side wall of the fixed seat is connected to a swinging structure extending radially thereof and located on both sides thereof; the fixed seat is provided with a stop structure below the end of the swinging structure away from the rotating shaft, which is used to be supported when the swinging structure swings downward by a certain amplitude.

[0016] As a further improvement of the present invention, the seat includes a seat frame and a seat surface whose edge is connected to the seat frame; the front end and the rear end of the rotating shaft respectively have a front fixing plate and a rear fixing plate extending along the left and right directions, and the front fixing plate and the rear fixing plate are respectively fixedly connected to the front frame part and the rear frame part of the seat frame.

[0017] As a further improvement of the present invention, the rear fixing plate is attached to the rear frame portion, and the rear fixing plate and the rear frame portion are fixedly connected in the front-to-back direction by multiple fasteners; the top edge of the front fixing plate extends horizontally forward to form an extended fixing plate, and the extended fixing plate and the front fixing plate are buckled together in the front frame portion, and the extended fixing plate and the front frame portion are fixedly connected in the up-down direction by multiple fasteners.

[0018] As a further improvement of the present invention, shaft sleeves are sleeved at both ends of the rotating shaft; the outer end of the shaft sleeve has a circle of flange protruding in the radial direction, and the flange abuts against the front side wall / rear side wall of the fixing seat.

[0019] As a further improvement of the present invention, the rear fixed plate and the two swing structures are connected with a reinforcing column extending in the front-to-back direction; the rear side wall of the fixing seat is provided with an avoidance groove extending in the up-down direction and allowing the reinforcing column to pass through.

[0020] As a further improvement of the present invention, the swing structure includes a swing plate extending radially along the rotating shaft and in a flat shape, and vertical reinforcement ribs extending from both sides of the swing plate; the reinforcement column passes through the reinforcement rib close to the rear fixed plate and is fixedly connected to the reinforcement rib away from the rear fixed plate.

[0021] As a further improvement of the present invention, both sides of the front frame and the rear frame of the seat frame are bulged upward, and the shape naturally transitions to the left and right side frame parts. The two side frame parts are arched to avoid the armrest frame, and the vertex formed by the arch is close to the front frame part.

[0022] As a further improvement of the present invention, the seat frame is formed with a top frame surface for connecting to the edge of the seat surface, and a slope surface formed by extending inwardly from the inner edge of the top frame surface to allow the seat surface to sink.

[0023] As a further improvement of the present invention, the fixed seat is provided with a crossbeam structure extending in the left and right directions and passing through its left and right side walls. The crossbeam structure passes under the rotating shaft and is fixed to the bottom plate of the fixed seat; the two ends of the crossbeam structure are respectively fixedly connected to the bottom ends of the two armrest frames.

[0024] Beneficial effects of the present invention:

[0025] 1. The fixed seat and the rotating shaft enable the chair seat to swing left and right, and are independent of the tray, so that the left and right swing and the front and back tilt complement each other;

[0026] 2. When the chair swings left or right, only the seat moves, while the rest of the chair remains stationary, eliminating any potential safety hazards.

[0027] 3. The center of gravity of the pivot and swing mechanism is close to the chair back. The seat structure allows the user to sit naturally close to the chair back, so that the center of gravity of the two is roughly in the same vertical range, making the user more comfortable and the pivot rotation more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the objects and advantages of the present invention, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of a chair that can swing left and right for implementation case 1;

[0030] Figure 2 This is a structural diagram of the top plate of the fixed seat in implementation case 1;

[0031] Figure 3 This is a structural diagram of the rotating shaft of implementation case 1;

[0032] Figure 4 This is a structural diagram of the seat frame of Implementation Case 1;

[0033] Figure 5 A cross-sectional schematic diagram of the fixing seat of Example 2;

[0034] Figure 6 This is a cross-sectional diagram of the damping structure and the regulating structure of implementation case 2;

[0035] Figure 7 Schematic diagram of the damping structure for implementation case 2;

[0036] Figure 8 Schematic diagram of the bottom surface of the swing structure in implementation case 2. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0038] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0039] Implementation Case 1:

[0040] Reference Figure 1-Figure 4 A chair that can swing left and right includes a chair leg frame 12 supported on the ground, a tray 11 connected to the top of the chair leg frame 12, and a chair back 13 connected to the rear end of the tray 11, a fixed base 2 fixed to the top of the tray 11, a seat 3 with front and rear ends respectively hinged to the front and rear side walls of the fixed base 2, an armrest frame 14 fixedly connected to the left and right sides of the fixed base 2 and extending upward, and an armrest structure 141 arranged at the top of the armrest frame 14 and higher than the seat 3.

[0041] The fixed seat 2 has a boxed structure with a certain thickness, and its specific hinge connection with the seat 3 is as follows: the fixed seat 2 is provided with a rotating shaft 41 extending along the front-to-back direction and passing through the front and rear side walls of the fixed seat 2. The above-mentioned front-to-back direction and the left-to-right direction described later are all based on the chair as a reference object, and the direction facing the chair forward is defined as the front, and the direction facing the back is defined as the rear; the front and rear ends of the seat 3 are fixedly connected to the front and rear ends of the rotating shaft 41 respectively, and the seat 3 can rotate around the rotating shaft 41 to realize its left and right swing function.

[0042] In the prior art, in most chairs with a tray 11, the seat 3, armrests 14, and backrest 13 are directly fixed to the tray 11. The tray 11 can rotate forward and backward and left and right relative to the foot frame 12, thereby driving the seat 3, armrests 14, and backrest 13 to tilt forward and backward and swing left and right. In the present application, however, when the seat 3 swings left and right, the foot frame 12, tray 11, armrests 14, and backrest 13 are all stationary. That is, except for the seat 3, the remaining components of the chair are all stationary.

[0043] First, if the damping of the left-right swing of the seat 3 is small, the swing flexibility will be relatively high. When the user sits upright on the seat 3, even a slight left or right swing will cause the seat 3 to swing rapidly, and the armrest 14 and the backrest 13 will also swing rapidly accordingly. The user's arms are supported by the armrest 14, so the user's entire upper body will quickly tilt to the left or right. This will not only cause the user to feel startled by an unstable center of gravity, but also pose a safety hazard. If the user's attention is not fully focused on controlling the swing amplitude, a large swing amplitude will cause the user's upper body center of gravity to shift too much, making it easy to fall. In the present application, the armrest 14 remains stationary when the seat 3 swings left and right. Even if the seat 3 has high left-right swing flexibility and a large swing amplitude, as long as the user's arms are supported by the armrest structure 141, the user's upper body center of gravity can still be confined within the range of the seat 3, avoiding a sense of startle and eliminating safety hazards.

[0044] Secondly, in the prior art, the chair's forward and backward tilt and left and right swing functions rely on the tray 11. The structures for both the forward and backward tilt and left and right swing functions are integrated into the tray 11. Without interfering with each other, these two structures are relatively complex. Furthermore, due to the small size of the tray 11, the strength and stability of these two structures are also limited. After prolonged use, they are prone to structural deformation, which can lead to two problems: first, the amplitude and flexibility of the forward and backward tilt and left and right swing functions may be affected, or even rendered inoperable; second, interference between these two structures may prevent simultaneous forward and backward tilt and left and right swing functions. In the present application, the left and right swing mechanism of the seat 3 is separated from the tray 11 and located within the fixed base 2. This allows only the forward and backward tilt mechanism to be located within the tray 11. This not only eliminates the left and right swing mechanism and simplifies the structure within the tray 11, but also provides more space within the tray 11, further enhancing the strength and stability of the forward and backward tilt mechanism. Furthermore, the separation of the fixed base 2 and the rotating shaft 41 from the tray 11 allows simultaneous forward and backward tilt and left and right swing functions without the risk of mechanical interference.

[0045] Furthermore, in the prior art, because the tray 11 integrates two functions, namely, forward and backward tilting and left and right swinging, these two movements occur in four directions. That is, these two movements exert forces on the chair leg frame 12 in the four directions of forward, backward, left and right. Therefore, the fixed connection strength between the tray 11 and the chair leg frame 12 must be relatively high. In the present application, under the premise that the tray 11 does not have the left and right swinging function, the maximum force exerted on the chair leg frame 12 is only the forward and backward direction. Therefore, the strength requirement for the connection between the tray 11 and the chair leg frame 12 is also reduced accordingly.

[0046] The seat 3 includes a seat frame 31 and a seat surface 32. The front frame portion 31-1 and the rear frame portion 31-2 of the seat frame 31 are arc-shaped and bulge upward on both sides, and naturally transition to the left and right side frame portions 31-3 in an arc shape. The two side frame portions 31-3 are arched to avoid the armrest frame 14, and the apex formed by the arch is close to the front frame portion 31-1. The edge of the seat surface 32 is connected to the seat frame 31, forming an ergonomically curved surface. The left and right sides of the seat surface 32 are slightly raised along the front frame 31-1 and the rear frame 31-2, allowing the seat surface 32 to better fit the physiological curve of the user's buttocks when sitting upright, and also providing a certain degree of wrapping in the left and right directions. The seat surface 32 is arched along the left and right side frames 31-3 in the front-to-back direction, with the apex of the arch close to the front. When the user sits upright on the seat surface 32, the buttocks are closer to the chair back 13, so that the user's upper body and the center of gravity of the overall structure (the rotating shaft 41 and the swing structure 42 described later) are substantially aligned, making the left and right swing of the seat 3 more stable. In addition, the front frame 31-1 is slightly longer than the rear frame 31-2, making the front width of the seat surface 32 wider than the rear width, allowing the user's legs to be naturally slightly spread apart when sitting upright, which is more comfortable.

[0047] The seat frame 31 has a top frame surface 31-A that connects to the edge of the seat surface 32. A sloped surface 31-B extends inward from the inner edge of the top frame surface 31-A, allowing the seat surface 32 to sink. The seat surface 32 is made of a multi-layered, elastic mesh fabric, with the edges glued to the top frame surface 31-A of the seat frame 31. The breathable and elastic seat surface 32 provides enhanced comfort.

[0048] The rotating shaft 41 is integrally connected to a swing structure 42 extending radially therefrom and located on either side thereof. The fixed seat 2 is provided with a stop structure 21 below the end of the swing structure 42 away from the rotating shaft 41. The stop structure 21 is a plate-like structure extending upward from the bottom plate of the fixed seat 2. When the swing structure 42 swings downward a certain amplitude, the end away from the rotating shaft 41 abuts against the stop structure 21, preventing the swing structure 42 from swinging further downward, thereby limiting the amplitude of the left and right swing of the seat 3. The swing structure 42 is connected to the rotating shaft 41 near the rear side wall. Therefore, the integrated structure formed by the rotating shaft 41 and the swing structure 42 is relatively close to the chair back 13, coinciding with the overall center of gravity of the user when sitting upright on the seat 3. This reduces the radial effect on the rotating shaft 41 and makes the left and right swing of the seat 3 more stable.

[0049] The swing structure 42 includes a flat swing plate 42-1 extending radially along the rotation axis 41, and vertical reinforcement ribs 42-2 extending from both sides of the swing plate 42-1. A reinforcement column 45 extending in the front-to-back direction is connected to the rear fixed plate 44 and the two swing structures 42. The rear side wall of the fixed seat 2 is provided with an escape groove 2-1 extending in the vertical direction to allow the reinforcement column 45 to pass through. The reinforcement column 45 passes through the reinforcement rib 42-2 near the rear fixed plate 44 and is fixedly connected to the reinforcement rib 42-2 away from the rear fixed plate 44. The reinforcement column 45 not only strengthens the overall structural strength of the rotation axis 41, the rear fixed plate 44, and the swing structure 42, distributing the load to prevent bending deformation, but also acts as a counterweight, placing the overall center of gravity close to the chair back 13 and enhancing the stability of the left-right swinging of the seat 3.

[0050] The front and rear ends of the rotating shaft 41 respectively have a front fixing plate 43 and a rear fixing plate 44 extending in the left and right directions. The front fixing plate 43 and the rear fixing plate 44 are respectively fixedly connected to the front frame portion 31-1 and the rear frame portion 31-2 of the seat frame 31, thereby strengthening the fixed connection strength between the rotating shaft 41 and the seat 3, reducing the force load on the rotating shaft 41, and avoiding structural damage.

[0051] The rear and front fixing plates 44, 43 are curved panels that conform to the arcs of the rear and front frame portions 31-2, 31-1, respectively. The rear fixing plate 44 is attached to the rear frame portion 31-2 and secured to the rear frame portion 31-2 in the front-to-back direction via a plurality of fasteners. The top edge of the front fixing plate 43 extends horizontally forward to form an extended fixing plate 431. The extended fixing plate 431 and the front fixing plate 43 are engaged with the front frame portion 31-1 and secured to the front frame portion 31-1 in the vertical direction via a plurality of fasteners. These two different methods of securing the seat 3 in different directions ensure a relatively strong connection between the seat 3 and the rotating shaft 41 in both the front-to-back and vertical directions. This ensures that the seat 3 will not deform or tilt forward or backward even when a user sits at different positions on the seat 3 with different centers of gravity.

[0052] Both ends of the rotating shaft 41 are sleeved with a shaft sleeve 411, and the outer end of the shaft sleeve 411 has a circle of flanges 411-1 protruding in the radial direction. The flanges 411-1 abut against the front side wall / rear side wall of the fixed seat 2, thereby preventing the rotating shaft 41 from moving along its axial direction, and therefore the seat 3 will not become loose in the front and rear directions.

[0053] The fixing seat 2 is provided with a crossbeam structure 22 extending in the left and right directions and passing through its left and right side walls. The crossbeam structure passes under the rotating shaft 41 and is fixed to the bottom plate of the fixing seat 2. The two ends of the crossbeam structure 22 are respectively fixedly connected to the bottom ends of the two armrests 14. The user's arms are supported on the armrest structure 141, which will apply a downward force to the armrest 14. The force load at the connection point between the armrest 14 and the fixing seat 2 is relatively large, and it is prone to bending and deformation after long-term use. The crossbeam structure 22 can improve the strength of the connection point.

[0054] Implementation Case 2:

[0055] Reference Figure 5-Figure 8 Based on Example 1, two damping structures 5 are provided within the fixed base 2, corresponding to the swinging structures 42. The damping structures 5 are made of an elastic material. When the swinging structure 42 swings with the rotation of the rotating shaft 41, the damping structures 5 are squeezed by the swinging structure 42, thereby generating damping. The damping increases with the increase in the swing amplitude. The damping structure 5 is also provided with an adjustment structure 6 for adjusting the initial damping effect of the damping structure 5 on the swinging structure 42.

[0056] The damping structure 5 made of elastic material is squeezed by the swinging structure 42 when it swings. The compression of the damping structure 5 will apply elastic force to the swinging structure 42 to prevent it from continuing to swing, thereby producing damping for the swinging structure 42. As the swinging amplitude of the swinging structure 42 increases, the compression of the damping structure 5 increases, so the damping is also enhanced. When the seat 3 swings left and right, the flexibility of the swing is inversely proportional to the swing amplitude, so that the user can better control the swing amplitude of the seat 3. The swinging speed can be braked before the swinging structure 42 abuts against the stop structure 21, so that the process of the seat 3 stopping after swinging to the maximum amplitude is smoother, reducing the sense of frustration and making customers more comfortable.

[0057] Depending on the needs of user experience, there are different requirements for the overall flexibility of the left and right swing of the seat 3. Therefore, an adjustment structure 6 is set on the damping structure 5, and the initial damping of the damping structure 5 is adjusted by the adjustment structure 6. Since the damping generated by the damping structure 5 increases with the increase of the swing amplitude, the overall flexibility of the left and right swing of the seat 3 can be adjusted after the initial damping is adjusted.

[0058] The adjustment structure 6 is made of a rigid material, with a portion located outside the damping structure 5 and another portion embedded within the damping structure 5. This portion of the adjustment structure 6 is tightly encased by the damping structure 5, providing support for the adjustment structure 6 and enhancing its rigidity. Furthermore, the rigidity of the portion of the damping structure 5 affected by the encasing diffusion is also enhanced. Consequently, the position and size of the damping structure 5, where the adjustment structure 6 is embedded, define the rigid portion 5-1 (enhanced rigidity) formed by the encasing and diffusion of the adjustment structure 6, and the flexible portion 5-2 (unenhanced rigidity). Although the degree of rigidity enhancement of the rigid portion 5-1 decreases as the distance from the adjustment structure 6 increases, its rigidity remains enhanced compared to the flexible portion 5-2. The flexible portion 5-2 and the damping structure 5 have essentially the same initial elasticity. Therefore, when the adjustment structure 6 is partially embedded within the damping structure 5, the overall rigidity of the damping structure 5 is enhanced. The ratio of the adjustment structure 6 located inside and outside the damping structure 5 is adjustable. By adjusting the ratio of the adjustment structure 6 embedded in the damping structure 5, the overall hardness of the damping structure 5 can be adjusted, that is, the initial damping of the damping structure 5 can be adjusted, thereby achieving the overall flexibility of the seat 3 swinging left and right.

[0059] Furthermore, a concave receiving groove 23 is formed on the bottom plate of the fixed seat 2 below the end of the swing structure 42 away from the rotating shaft 41. The damping structure 5 is placed in the receiving groove 23. Its length in the front-to-back direction is slightly greater than the width of the swing structure 42, so that it has a margin in the front-to-back direction in supporting the swing structure 42. A through hole 23-A is provided at the bottom of the receiving groove 23, through which the upper line passes. The damping structure 5 has an upwardly extending insertion channel 5-A formed at the bottom end. The insertion channel 5-A is connected to the through hole 23-A of the receiving groove 23. The adjustment structure 6 is a rod-shaped structure and its length is greater than the insertion channel 5-A. The adjustment structure 6 is inserted into the insertion channel 5-A from the bottom of the fixed seat 2 through the through hole 23-A.

[0060] The hard portion 5-1 and the soft portion 5-2 are roughly divided by a horizontal line at the top of the adjustment structure 6. The portion of the damping structure 5 from the bottom to the horizontal line at the top of the adjustment structure 6 is the hard portion 5-1, and the portion of the damping structure 5 from the top to the horizontal line at the top of the adjustment structure 6 is the soft portion 5-2. The depth of the adjustment structure 6 inserted into the insertion channel 5-A determines the height of the horizontal line at its top. Therefore, by adjusting the insertion depth of the adjustment structure 6, the overall hardness of the damping structure 5 can be adjusted, thereby adjusting the initial damping of the damping structure 5.

[0061] It is worth noting that the damping structures 5 located on both sides of the rotating shaft 41 are independent of each other, so the initial damping of the two damping structures 5 is also set independently. Some users may have special needs for left and right swinging. For example, users with dislocation of the small joints on the left and right sides of the spine require higher flexibility in swinging in one direction and lower flexibility in the other direction.

[0062] The accommodating groove 23 has a flange structure 231 extending upward along the periphery of the through hole 23-A. Correspondingly, the insertion channel 5-A is formed with a step structure 51 that abuts against the top of the flange structure 231, so that the flange structure 231 and the insertion channel 5-A are extensible and have approximately the same inner diameter. The adjusting structure 6 is threadedly engaged with the flange structure 231, which facilitates the adjusting structure 6 to accurately control the depth of insertion into the insertion channel 5-A and also prevents the adjusting structure 6 from sliding or even slipping off in the axial direction. In addition, the upper portion of the adjusting structure 6, i.e., the portion inserted into the insertion channel 5-A, can be machined with some anti-slip patterns or anti-slip bumps on its surface to enhance the friction coefficient between it and the damping structure 5, thereby increasing the hardness enhancement amplitude of the hard portion 5-1 and expanding the adjustment range of the initial damping. However, this will increase the force required to adjust the axial position of the adjusting structure 6. Therefore, the anti-slip patterns or anti-slip bumps need to be reasonably set in terms of their coverage and the thickness of the radial projection along the adjusting structure 6.

[0063] The damping structure 5 extends in the front-to-back direction, and its cross-section is basically triangular, that is, the left and right side surfaces 5-L of the damping structure 5 are inclined slopes. The two side surfaces 5-L converge at the top of the damping structure 5 to form a chamfered portion 52 that contacts and is squeezed by the swing structure 42. The chamfered portion 52 can have an arc transition or a polygonal shape with sharp corners. The shape setting of the damping structure 5 mainly serves two purposes. A space is reserved between the damping structure 5 with a triangular cross-section and the accommodating groove 23. When the swing structure 42 squeezes the damping structure 5, the damping structure 5 deforms and gradually becomes flatter and wider. Therefore, the reserved space allows the damping structure 5 to deform. After being squeezed by the swing structure 42, the chamfered portion 52 forms a band-shaped contact surface extending in the front-to-back direction. The width of the contact surface increases with the swing amplitude. On the one hand, the chamfered portion 52 can reduce the contact area with the swing structure 42, so that the damping it produces on the swing structure 42 is more concentrated. On the other hand, the damping also increases with the swing amplitude, and the area of the contact surface also increases synchronously with the swing amplitude, which can make the force load of the damping structure 5 more uniform, avoid excessive compression at the top, and extend its service life.

[0064] The bottom surface of the swing structure 42 has a straight groove 42-A that is concave inward and extends in the front-to-back direction. The two groove walls of the straight groove 42-A are slightly inclined and symmetrical, so that its shape matches the two inclined side surfaces 5-L of the damping structure 5. When the swing structure 42 swings, the chamfered portion 52 of the damping structure 5 is embedded in the straight groove 42-A, which plays a role in positioning the chamfered portion 52, thereby avoiding friction and sliding between the chamfered portion 52 and the swing structure 42 in the left-right direction, thereby reducing friction loss to the damping structure 5.

[0065] When the adjustment structure 6 reaches the top of the insertion channel 5-A, the adjustment structures 6 on either side of the rotating shaft 41 press against the two swing structures 42 of the rotating shaft 41, thereby locking the seat 3 from swinging left or right. The top of the adjustment structure 6 supports the top of the damping structure 5. The bottom surface of the swing structure 42 has a circular groove 42-B that is recessed inward and connected to the linear groove 42-A. The depth of the circular groove 42-B is greater than that of the linear groove 42-A. When the swing structure 42 swings, the portion of the chamfered portion 52 supported by the top of the adjustment structure 6 is embedded in the circular groove 42-B, thereby preventing it from slipping.

[0066] The insertion channel 5-A does not completely penetrate the top of the damping structure 5, thereby preventing the adjustment structure 6 from passing through the top of the damping structure 5 and colliding rigidly with the swing structure 42. Therefore, the insertion channel 5-A penetrates the top of the damping structure 5 and forms an opening 5-B. The damping structure 5 has a closing structure 53 extending along the periphery of the opening 5-B, which shrinks toward the center of the opening. When the insertion channel 5-A of the damping structure 5 is fully inserted by the adjustment structure 6, the closing structure 53 is supported on the top of the adjustment structure 6, thereby separating the top of the adjustment structure 6 from the swing structure 42. In addition, the closing structure 53 has a compression amount in the vertical direction, and the structure presents an arched shape that arches upward from the outer edge to the inner edge, so that it has a margin for deformation when squeezed by the swing structure 42, preventing squeeze damage.

[0067] To prevent the adjustment structure 6 from being inserted too far and thus pushing up the damping structure 5, an adhesive layer is applied to the surface of the damping structure 5 that contacts the receiving groove 23 and the flange structure 231, thereby bonding the damping structure 5 to the receiving groove 23. In addition, to facilitate the rotation of the adjustment structure 6, a rotary cap 61 is provided at the bottom end of the adjustment structure 6.

[0068] 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 above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above 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 chair that can swing left and right, comprising a chair frame supported on the ground, a tray connected to the top of the chair frame, and a chair back connected to the rear end of the tray; characterized in that: The top of the tray is fixedly connected to a fixed base; the fixed base is provided with a rotating shaft extending in the front and rear directions and passing through the front and rear side walls thereof, a seat is provided above the fixed base, and the front and rear ends of the seat are fixedly connected to the front and rear ends of the rotating shaft respectively; armrest frames are fixedly connected on both sides of the fixed base to avoid the left and right swing range of the seat and extend upward, and the armrest frames are higher than the top of the seat and are provided with an armrest structure for supporting the arms; the rotating shaft is connected to a swinging structure extending in its radial direction and located on both sides thereof, and the fixed base has a space inside which allows the swinging structure to swing up and down from a horizontal state; a A damping structure made of elastic material can produce damping when squeezed by the swinging structure when it swings, and the damping increases with the increase of the swing amplitude; the damping structure is provided with an adjustment structure for adjusting the size of the initial damping produced by the damping structure on the swinging structure; the adjustment structure is made of rigid material, one part of which is located outside the damping structure, and the other part is embedded in the inside of the damping structure; the damping structure defines a hard part with enhanced hardness formed by being wrapped in the adjustment structure and its diffusion affected by the wrapping, and a soft part with unenhanced hardness; the ratio of the two parts of the adjustment structure located inside and outside the damping structure is adjustable.

2. The chair that can swing left and right according to claim 1, characterized in that: The seat includes a seat frame and a seat surface whose edge is connected to the seat frame; the front end and the rear end of the rotating shaft respectively have a front fixing plate and a rear fixing plate extending in the left and right directions, and the front fixing plate and the rear fixing plate are respectively fixedly connected to the front frame part and the rear frame part of the seat frame.

3. The chair that can swing left and right according to claim 2, characterized in that: The rear fixing plate is attached to the rear frame portion, and the rear fixing plate and the rear frame portion are fixedly connected in the front-to-back direction by a plurality of fasteners; the top edge of the front fixing plate extends horizontally forward to form an extended fixing plate, and the extended fixing plate and the front fixing plate are buckled together in the front frame portion, and the extended fixing plate and the front frame portion are fixedly connected in the up-down direction by a plurality of fasteners.

4. The chair that can swing left and right according to claim 2, characterized in that: Both ends of the rotating shaft are sleeved with shaft sleeves; the outer end of the shaft sleeve has a circle of flange protruding in the radial direction, and the flange abuts against the front side wall / rear side wall of the fixing seat.

5. The chair that can swing left and right according to claim 2, characterized in that: The rear fixing plate and the two swing structures are connected with a reinforcing column extending in the front-to-back direction; the rear side wall of the fixing seat is provided with an avoidance groove extending in the up-down direction and allowing the reinforcing column to pass through.

6. The chair that can swing left and right according to claim 5, characterized in that: The swing structure includes a swing plate extending radially along the rotating shaft and in a flat shape, and vertical reinforcing ribs extending from both sides of the swing plate; the reinforcing column passes through the reinforcing rib close to the rear fixed plate and is fixedly connected to the reinforcing rib away from the rear fixed plate.

7. The chair that can swing left and right according to claim 2, characterized in that: Both sides of the front and rear frame parts of the seat frame are bulged upward, and the shape naturally transitions to the left and right side frame parts. The two side frame parts are arched to avoid the armrest frame, and the apex formed by the arch is close to the front frame part.

8. The chair that can swing left and right according to claim 7, characterized in that: The seat frame is formed with a top frame surface for connecting to the edge of a seat surface, and a slope surface formed by extending inwardly from the inner edge of the top frame surface and allowing the seat surface to sink.

9. The chair that can swing left and right according to claim 1, characterized in that: The fixing seat is provided with a crossbeam structure extending in the left and right directions and penetrating the left and right side walls thereof. The crossbeam structure passes under the rotating shaft and is fixed to the bottom plate of the fixing seat; the two ends of the crossbeam structure are respectively fixedly connected to the bottom ends of the two handrail frames.

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