CN113229655A

CN113229655A - Chair seat mechanism

Info

Publication number: CN113229655A
Application number: CN202110433942.9A
Authority: CN
Inventors: 郑彬; 孟振林; 潘文原; 杨堃; 谢秋平
Original assignee: Dke Office System Co ltd
Current assignee: Dke Office System Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-08-10
Anticipated expiration: 2041-04-22
Also published as: WO2022222422A1; CN113229655B

Abstract

The invention discloses a chair seat mechanism, which comprises a fixed seat and a chair seat, wherein the fixed seat is provided with a rotating shaft which extends along the front-back direction and penetrates through the front side wall and the back side wall of the fixed seat; the seat is positioned above the fixed seat, and the front end and the rear end of the seat are fixedly connected with the front end and the rear end of the rotating shaft respectively; the rotating shaft is connected with a swinging structure which extends along the radial direction of the rotating shaft and is positioned on two sides of the rotating shaft, and a space which allows the swinging structure to swing up and down from a horizontal state is arranged in the fixed seat; the damping structure made of elastic materials is arranged in the fixed seat, the damping structure can be extruded by the swing structure to generate damping when the swing structure swings, and the damping is enhanced along with the increase of the swing amplitude; the damping structure is provided with an adjusting structure for adjusting the initial damping generated by the damping structure on the swing structure. The invention has the advantages that the swing amplitude can be better controlled, and the overall flexibility of the left-right swing of the chair seat can be adjusted.

Description

Chair seat mechanism

Technical Field

The invention relates to a chair seat mechanism which is mainly applied to the technical field of office chairs or leisure chairs.

Background

In the prior art, most of chairs (including office chairs and leisure chairs) with trays have the functions of swinging the seat left and right through the trays, and some chairs can also tilt back and forth through the trays, namely, the functions of swinging left and right and tilting back and forth are all integrated in the trays.

For example, patent application publication No. CN110313742A discloses a supporting structure of a seat, which includes a tray support and a seat plate disposed on the tray support, wherein a swing component is disposed between the tray support and the seat plate, and is characterized in that: the swing subassembly is including the upper substrate and the infrabasal plate that set up from top to bottom, upper substrate and seat bottom fixed connection, the top fixed connection of infrabasal plate and tray support, is provided with elastic component and a plurality of connecting piece between upper substrate and the infrabasal plate, and the upper end of connecting piece runs through the upper substrate and restricts the upper substrate rebound, and the lower extreme of connecting piece runs through the infrabasal plate and restricts the infrabasal plate rebound, and is sharp setting around a plurality of connecting pieces, the elastic component sets up around the connecting piece. The swing assembly of the seat supporting structure is provided with the connecting pieces, the connecting pieces are linearly arranged front and back, the seat can swing left and right, the front and back swing of the seat is restrained, and the front and back swing of the seat is reduced. The supporting structure that this patent was disclosed can realize the horizontal hunting of seat support (bedplate), though the range of fore-and-aft oscillation can be reduced in the setting through the connecting piece, still can cause the unstability of seat support horizontal hunting, causes user experience to feel relatively poor to the swing of the little range of fore-and-aft direction can produce a shake sensation near, makes the user frighten easily.

For example, patent application publication No. CN110710815A discloses a dynamic tray comprising: a first base; the second base is connected with the first base in a left-right rotating mode; one end of the first crank is hinged with the first base; the other end of the first crank is hinged with an elastic transfer connecting piece, and the elastic transfer connecting piece is used for connecting the seat supporting piece; the two ends of the second crank are respectively hinged with the second base and the bearing piece, the bearing piece is rigid and is used for connecting the base supporting piece, and the bearing piece is positioned at the upper end of the second base; the rocker is configured to be connected with the chair back component and is connected with the second crank into a whole; and the elastic resetting device is used for enabling the rocker to pry the second crank to move and then enabling the second crank to recover the original position.

The application is constructed by adopting a four-bar principle, and the gravity of the human body exerted on the bearing piece and the driving force of the wane form an antagonistic relation and reach a relative balance; therefore, the chair back can correspondingly match with the leaning and leaning restoring force according to the weight of the human body, and simultaneously has the functions of left and right leaning and swinging, and can automatically adapt to the sitting posture change of the user who leans forwards and backwards and leans forwards and swings left and right. In this patent application, in the whole integrated dynamic tray of function of horizontal hunting and forward and backward tilt, be limited by the volume size of tray, the seat support piece, the second base, the connector and the second crank that realize horizontal hunting receive great restriction on spatial arrangement for horizontal hunting's range is limited, and the intensity of these several parts and the bulk strength after the equipment also are relatively weak under the restriction of tray volume, appear the impaired phenomenon of structures such as bending deformation after long-time the use easily.

This patent application horizontal hunting is realized through four-bar linkage to through the setting reset mechanism that sways that has the spring, the elasticity that produces during the swing progressively increases the resistance, and plays the effect that resets, but this reset mechanism that sways's elastic modulus is unchangeable, whole flexibility ratio when unable adjustment this reset mechanism that sways through the whole hardness of adjustment promptly when adjusting the horizontal hunting, is defective in optimizing user's experience.

Although the patent does not mention the arm of the chair, it is known from the context of the patent and from the drawings that the arm of the chair can only be fixedly connected to the tray or the seat. Therefore, when the chair swings left and right, the chair arm rests swing with the same amplitude. Because the overall flexibility during the left-right swinging cannot be adjusted, the arms of a user are supported on the armrests when the user sits up, and if the flexibility is high, the sudden nature caused by the excessively high swinging speed during the left-right swinging of the seat can lead the user to be frightened, and the overall gravity center of the upper half of the body of the user deviates out of the range of the seat, so that the user is easy to fall down, and certain potential safety hazards are caused.

In addition, the front and back tilting of the chair is realized by the chair back, and the chair seat does not have the function of front and back tilting.

For example, patent application publication No. CN111904196A discloses a chair and a rocking tray thereof, which includes a second rocking mechanism and a first rocking mechanism, the first rocking mechanism includes a first base, two first spring assemblies and a first connecting shaft, the first base is fixedly connected with a chair seat, one end of the first spring assembly is connected with the first base and the other end is connected with the second rocking mechanism, the first connecting shaft is fixedly connected with the first base, the first connecting shaft is distributed along the X direction and rotatably mounted on the second rocking mechanism, and the first base can be mounted on the second rocking mechanism by left-right rocking through the first connecting shaft. This patent application has increased the first swing mechanism of yaw through the second swing mechanism that can incline forward and backward originally to the first swing mechanism that increases does not interfere second swing mechanism inner structure, is about to the function that the yaw and incline forward and backward is whole to be integrated in the tray, leads to the structure in the tray comparatively complicated, and spatial arrangement is comparatively compact, has compressed the range that the yaw and incline forward and backward, and has also influenced the structural strength of first swing mechanism and second swing mechanism. The first swing mechanism for realizing the side-to-side swing according to this application also has the problem mentioned in CN 110710815A.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a chair seat capable of swinging left and right, the swinging amplitude can be better controlled, and the overall flexibility of the left and right swinging of the chair seat can be adjusted.

The invention is realized by the following technical scheme.

A chair seat mechanism comprises a fixed seat and a chair seat, wherein the fixed seat is provided with a rotating shaft which extends along the front-back direction and penetrates through the front side wall and the back side wall of the fixed seat; the seat is positioned above the fixed seat, and the front end and the rear end of the seat are fixedly connected with the front end and the rear end of the rotating shaft respectively; the rotating shaft is connected with a swinging structure which extends along the radial direction of the rotating shaft and is positioned on two sides of the rotating shaft, and a space which allows the swinging structure to swing up and down from a horizontal state is arranged in the fixed seat; the damping structure made of elastic materials is arranged in the fixed seat, the damping structure can be extruded by the swing structure to generate damping when the swing structure swings, and the damping is enhanced along with the increase of the swing amplitude; the damping structure is provided with an adjusting structure for adjusting the initial damping generated by the damping structure on the swing structure.

The damping structure is compressed and can exert elasticity to swing structure to production is to swing structure's damping, and along with swing structure swing range's increase, the damping also strengthens thereupon, and the wobbling flexibility ratio is inversely proportional with the amplitude of swing, thereby makes the swing range that the user can control the seat support better, just can brake the swing speed before swing structure supports and leans on before the retaining structure, makes the process that the seat support swung and stops after the maximum amplitude more steady.

The size of the initial damping of the damping structure is adjusted through the adjusting structure, and the damping generated by the damping structure is enhanced along with the increase of the swing amplitude, so that the overall flexibility of the left-right swing of the chair seat can be adjusted after the initial damping is adjusted.

As a further improvement of the invention, the adjusting structure is made of rigid material, one part of the adjusting structure is positioned outside the damping structure, and the other part of the adjusting structure is embedded into the damping structure; the damping structure is limited to be wrapped on the adjusting structure and a hard part with enhanced hardness and a soft part with non-enhanced hardness, wherein the hard part is formed by diffusion of the adjusting structure under the influence of wrapping; the adjusting structure is positioned in the damping structure, and the proportion of the inner part and the outer part of the adjusting structure can be adjusted.

As a further improvement of the invention, an inward-concave containing groove is formed below the bottom plate of the fixed seat, which is positioned at one end of the swinging structure away from the rotating shaft, and the damping structure is placed in the containing groove; the bottom of the accommodating groove is provided with a through hole, the damping structure is provided with an inserting channel which is communicated with the through hole and extends upwards, and the adjusting structure is rod-shaped and is inserted into the inserting channel through the through hole.

As a further improvement of the invention, the containing groove is provided with a circle of flange structure extending upwards along the periphery of the through hole, and the inserting channel is provided with a step structure abutting against the top of the flange structure; the adjusting structure is in threaded fit with the flange structure.

As a further improvement of the invention, the left side surface and the right side surface of the damping structure are inclined slopes, and the two side surfaces are gathered at the top of the damping structure to form a chamfer part which is contacted with the swinging structure and is extruded.

As a further improvement of the present invention, the bottom surface of the swing structure has a linear groove formed to be recessed inward and extending in the front-rear direction; when the swinging structure swings, the chamfer part of the damping structure is embedded into the linear groove.

As a further improvement of the present invention, the bottom surface of the swing structure further has a circular groove formed depressed inward and communicating with the linear groove; the depth of the inward recess of the circular groove is greater than that of the linear groove; when the insertion channel of the damping structure is completely inserted by the adjusting structure, the part of the chamfer part supported by the top end of the adjusting structure is embedded in the circular groove when the swinging structure swings.

As a further improvement of the present invention, the inserting channel penetrates through the top end of the damping structure and forms an opening, and the damping structure extends along the periphery of the opening and has a closing structure which shrinks towards the center of the opening and has a compression amount in the vertical direction; when the inserting channel of the damping structure is completely inserted by the adjusting structure, the closing-up structure is supported at the top end of the adjusting structure.

As a further improvement of the invention, the damping structure is attached to the surfaces of the accommodating groove and the flange structure and coated with an adhesive layer.

As a further improvement of the invention, the bottom end of the adjusting structure is provided with a screw cap.

The invention has the beneficial effects that:

1. when the damping structure is extruded, the damping structure generates damping on the swinging structure, so that the swinging is more stable;

2. according to the proportion of the adjusting structure inserted into the damping structure, the overall hardness of the damping structure can be adjusted, and then the initial damping can be adjusted, so that the swinging flexibility of the chair seat can be controlled.

Drawings

The preferred embodiments of the present invention will hereinafter be described in detail to facilitate understanding of the objects and advantages of the invention, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a chair capable of swinging left and right in embodiment 1;

FIG. 2 is a schematic view of the structure of the fixing base with the top plate lifted in the embodiment 1;

FIG. 3 is a schematic structural view of a spindle according to embodiment 1;

FIG. 4 is a schematic structural view of a seat frame in accordance with embodiment 1;

FIG. 5 is a schematic sectional view of the fixing base of embodiment 2;

FIG. 6 is a schematic sectional view of the damping structure and the adjusting structure in embodiment 2;

FIG. 7 is a schematic structural diagram of a damping structure in embodiment 2;

fig. 8 is a schematic view of the bottom surface of the swing structure of embodiment 2.

Detailed Description

The invention is explained in more detail below with reference to the drawings and exemplary embodiments.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

Example 1:

referring to fig. 1-4, a chair capable of swinging left and right comprises a chair leg frame 12 supported on the ground, a tray 11 connected to the top end of the chair leg frame 12, a chair back 13 connected to the rear end of the tray 11, a fixed seat 2 fixed on the top of the tray 11, a chair seat 3 with front and rear ends hinged to the front and rear side walls of the fixed seat 2, armrest frames 14 fixedly connected to the left and right sides of the fixed seat 2 and extending upward, and an armrest structure 141 arranged on the top end of the armrest frame 14 and higher than the chair seat 3.

The fixing base 2 presents a boxed structure with a certain thickness, and the specific hinging way with the chair seat 3 is as follows: the fixed base 2 is provided with a rotating shaft 41 which extends in the front-back direction and penetrates through the front side wall and the rear side wall of the fixed base 2, the front-back direction and the left-right direction which will be described later are both taken as reference objects of the chair, the direction in which the chair faces in the front direction is defined as the front, and the direction in which the chair faces in the back direction is defined as the rear; the front end and the rear end of the seat 3 are respectively fixedly connected with the front end and the rear end of the rotating shaft 41, and the seat 3 can rotate around the rotating shaft 41 to realize the function of swinging left and right.

In most of the chairs with the tray 11 in the prior art, the seat 3, the armrest frame 14 and the backrest 13 are directly fixed on the tray 11, and the tray 11 can rotate back and forth and left and right relative to the chair foot rest 12, so as to drive the seat 3, the armrest frame 14 and the backrest 13 to tilt back and forth and swing left and right. In the present application, when the seat 3 swings left and right, the chair leg frame 12, the tray 11, the armrest frame 14, and the backrest 13 are all stationary, i.e., the rest of the components of the chair except the seat 3 are all stationary.

Firstly, if the damping of the leftward and rightward swinging of the seat 3 is small, the swinging flexibility is high, the user sits on the seat 3, the seat 3 swings rapidly as long as the user slightly swings leftward or rightward, the armrest frame 14 and the seat back 13 also swing rapidly, the arms of the user are supported on the armrest frame 14, and therefore the whole upper half of the user can tilt to the left or right rapidly, and the frightening feeling caused by unstable gravity of the user can be caused. And moreover, the swing amplitude is too large, so that the gravity center of the upper body of the user is shifted too much, and the user is easy to fall down. In the present embodiment, the armrest frame 14 is stationary when the seat 3 swings left and right, and even if the seat 3 swings left and right with high flexibility and large swing width, the entire center of gravity of the upper body of the user can be limited within the range of the seat 3 as long as the user's arm is supported by the armrest structure 141, so that a sense of scaring can be avoided, and no potential safety hazard is generated.

Secondly, in the prior art, the functions of the chair with forward and backward tilting and left and right swinging are dependent on the tray 11, the structure for realizing the forward and backward tilting function and the structure for realizing the left and right swinging function are integrated in the tray 11, and the two structures are relatively complex on the premise that the structures do not interfere with each other; in addition, limited by the smaller volume of the tray 11, the structural strength and the structural stability of the two structures are also defective, and the structures are easy to deform after long-time use, which may cause two problems, one of which is that the front and back tilt, the amplitude of the left and right swing, and the flexibility are problematic, and even cannot be implemented; secondly, the two structures have structural interference, so that the front-back leaning and the left-right swinging cannot be carried out simultaneously. In this application, with the structure of seat support 3 horizontal hunting separate from tray 11 and set up in fixing base 2, can only set up the structure that inclines and face upward around realizing in tray 11, not only saved the structure that realizes the horizontal hunting, simplified the structure in tray 11, tray 11 space is more abundant moreover, can further strengthen the intensity and the stability of the structure that inclines and face upward around realizing more. In addition, the separation of the fixed base 2 and the rotating shaft 41 from the tray 11 not only can simultaneously perform forward and backward tilting and leftward and rightward swinging, but also can not have the risk of mechanical interference at all.

Furthermore, in the prior art, since the tray 11 integrates two functions of tilting forward and backward and swinging left and right, the two actions have four directions, that is, the two actions exert forces in four directions, namely, the forward, backward, left and right directions on the chair leg 12, so that the fixed connection strength between the tray 11 and the chair leg 12 is required to be high. In the present application, on the premise that the tray 11 does not perform the function of rocking right and left, the chair leg frame 12 is applied with a force in the front-rear direction at most, and therefore the requirement for the connection strength between the tray 11 and the chair leg frame 12 is also reduced accordingly.

The seat 3 includes a seat frame 31, a seat surface 32, a front frame portion 31-1 and a rear frame portion 31-2 of the seat frame 31 are curved and are upwardly convex on both sides, and are curved to naturally transition to the left and right side frame portions 31-3, 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 chair surface 32 is connected to the chair seat frame 31 to present an arc surface conforming to the human engineering, the left side and the right side of the chair surface 32 slightly bulge upwards along with the front frame part 31-1 and the rear frame part 31-2, so that a user can be more fit with the physiological curve of the buttocks when sitting up, and a certain wrapping feeling is provided in the left and right directions; the seat surface 32 is formed in an arch shape along the left and right side frame portions 31-3 in the front-rear direction, and the apex of the arch is close to the front side, so that when a user sits on the seat surface 32, the buttocks can be brought closer to the seat back 13, the center of gravity of the whole structure formed by the user's upper body, the rotating shaft 41 and the swing structure 42 which will be described later is basically overlapped, and the left-right swing of the seat 3 is more stable. In addition, the front frame portion 31-1 is slightly longer than the rear frame portion 31-2, so that the front portion of the seat surface 32 is wider than the rear portion, and the legs of the user can be naturally slightly spread when sitting up, which is more comfortable.

The seat frame 31 is formed with a top frame surface 31-a for connecting the edge of the seat surface 32, and a slope surface 31-B formed by extending the inner edge of the top frame surface 31-a inward and allowing the seat surface 32 to sink, the seat surface 32 is made of a plurality of layers of elastic mesh cloth, and the edge is bonded and fixed on the top frame surface 31-a of the seat frame 31 by using an adhesive. The chair surface 32, which is air permeable and has a certain elasticity, may be more comfortable for the user.

The rotating shaft 41 is integrally connected with a swinging structure 42 which extends along the radial direction of the rotating shaft and is positioned on two sides of the rotating shaft, a stopping structure 21 is arranged below one end, away from the rotating shaft 41, of the fixed seat 2, the stopping structure 21 is a plate-shaped structure which extends upwards from a bottom plate of the fixed seat 2, one end, away from the rotating shaft 41, of the swinging structure 42 abuts against the stopping structure 21 when the swinging structure 42 swings downwards by a certain amplitude, the swinging structure 42 is prevented from continuing to swing downwards, and therefore the amplitude of the left-right swinging of the seat 3 is limited. The swing structure 42 is connected to the position of the rotating shaft 41 near the rear side wall, so that the integral structure formed by the rotating shaft 41 and the swing structure 42 is closer to the chair back 13 and is matched with the integral gravity center of a user sitting on the chair seat 3, the radial action on the rotating shaft 41 is reduced, and the left-right swing of the chair seat 3 is more stable.

The swing structure 42 includes a swing plate 42-1 extending along the radial direction of the rotating shaft 41 and in a flat state, and a reinforcing rib 42-2 extending from both side edges of the swing plate 42-1 and in a vertical state. The rear fixing plate 44 and the two swing structures 42 are connected with a reinforcing column 45 extending along the front-rear direction, the rear side wall of the fixing base 2 is provided with an avoidance groove 2-1 extending in the up-down direction and allowing the reinforcing column 45 to pass through, and the reinforcing column 45 penetrates through the reinforcing rib 42-2 close to the rear fixing plate 44 and is fixedly connected to the reinforcing rib 42-2 far away from the rear fixing plate 44. The reinforcing column 45 can reinforce the overall structural strength of the rotating shaft 41, the rear fixing plate 44 and the swing structure 42, and can share the stress load to avoid the occurrence of bending deformation, and can also play a role of a counterweight, so that the overall center of gravity is close to the chair back 13, and the stability of the left-right swing of the chair seat 3 is enhanced.

The front end and the rear end of the rotating shaft 41 are respectively provided with a front fixing plate 43 and a rear fixing plate 44 which extend out along the left-right direction, the front fixing plate 43 and the rear fixing plate 44 are respectively fixedly connected with the front frame part 31-1 and the rear frame part 31-2 of the seat frame 31, the fixed connection strength of the rotating shaft 41 and the seat 3 is enhanced, the stress load of the rotating shaft 41 is reduced, and the structural damage is avoided.

The rear fixing plate 44 and the front fixing plate 43 are arc-shaped panels which are matched with the arc-shaped rear frame portion 31-2 and the arc-shaped front frame portion 31-1, wherein the rear fixing plate 44 is attached to the rear frame portion 31-2 and fixedly connects the rear fixing plate 44 and the rear frame portion 31-2 in the front-rear direction through a plurality of fasteners, the top edge of the front fixing plate 43 extends horizontally forward to form an extension fixing plate 431, the extension fixing plate 431 and the front fixing plate 43 are buckled on the front frame portion 31-1, and the extension fixing plate 431 and the front frame portion 31-1 are fixedly connected in the up-down direction through a plurality of fasteners. And these two kinds of modes of carrying out fixed connection along equidirectional and seat support 3 for seat support 3 all has comparatively firm joint strength along fore-and-aft direction and upper and lower direction and pivot 41, makes the user end sit under the different positions of seat support 3 have the condition of different centrobarics, and the condition emergence that the seat support 3 warp or the front and back end perk can not appear.

The two ends of the rotating shaft 41 are sleeved with the shaft sleeve 411, the outer end of the shaft sleeve 411 is provided with a circle of flange 411-1 which protrudes along the radial direction, and the flange 411-1 abuts against the front side wall/rear side wall of the fixed seat 2, so that the rotating shaft 41 can be prevented from moving along the axial direction, and the seat 3 can not be loosened in the front and rear directions.

Fixing base 2 is equipped with and extends and run through the crossbeam structure 22 of lateral wall about it along controlling the direction, measure the structure and pass and fix the bottom plate at fixing base 2 by pivot 41 below, crossbeam structure 22's both ends respectively with the bottom fixed connection of two handrail framves 14, user's arm supports on handrail structure 141, can apply a decurrent effort to handrail frame 14, the atress load of the tie point between handrail frame 14 and the fixing base 2 is great relatively, bending deformation scheduling problem appears easily after long-time the use, crossbeam structure 22 can improve the intensity of tie point.

Example 2:

referring to fig. 5 to 8, on the basis of embodiment 1, two damping structures 5 corresponding to the swing structure 42 are disposed in the fixing base 2, the damping structures 5 are made of elastic material, when the swing structure 42 swings with the rotation of the rotating shaft 41, the damping structures 5 are pressed by the swing structure 42 to generate damping, and the damping is enhanced with the increase of the swing amplitude. The damping structure 5 is further provided with an adjusting structure 6 for adjusting the amount of initial damping generated by the damping structure 5 on the oscillating structure 42.

The damping structure 5 of elastic material is extruded by it when swing structure 42 swings, damping structure 5 compression can apply its elasticity that prevents to continue the wobbling to swing structure 42, thereby production is to swing structure 42's damping, and along with the increase of swing structure 42 swing range, damping structure 5's compressive capacity increases, therefore the damping also strengthens thereupon, seat support 3 is when the horizontal hunting, the wobbling flexibility ratio is the inverse ratio with the range of swing, thereby make the user can control the swing range of seat support 3 better, just can brake swing speed before swing structure 42 supports and leans on retaining structure 21, make the process that stops after seat support 3 swings the maximum amplitude more steady, reduce the feeling of setback and let the customer more comfortable.

Different according to the demand that the user used experience, there is also different requirement to the whole flexibility ratio of seat support 3 horizontal hunting, consequently sets up on damping structure 5 and adjusts structure 6, adjusts damping structure 5's initial damping's size through adjusting structure 6, because the damping that damping structure 5 produced strengthens along with the increase of swing amplitude, consequently initial damping can adjust the whole flexibility ratio of seat support 3 horizontal hunting after adjusting.

The adjusting structure 6 is made of rigid material, one part of the adjusting structure 6 is positioned outside the damping structure 5, the other part of the adjusting structure is embedded into the damping structure 5, the adjusting structure 6 of the part is tightly wrapped by the damping structure 5, so that the adjusting structure 6 has a supporting effect on the adjusting structure, the hardness of the adjusting structure is enhanced, the hardness of the damping structure 5 affected by wrapping and diffusion is also enhanced, and the position and the size of the damping structure 5 embedded by the adjusting structure 6 limit the hard part 5-1 which is wrapped on the adjusting structure 6 and formed by affected and diffused by wrapping and the hardness of the adjusting structure 5 is enhanced, and the soft part 5-2 of which the hardness is not enhanced. Although the hard portion 5-1 has a reduced degree of increased hardness with an increase in the distance-adjusting structure 6, the soft portion 5-2 has substantially the same elasticity as the damping structure 5 in the initial state as compared with the soft portion 5-2, and thus the overall hardness of the damping structure 5 is increased in the case where the adjusting structure 6 is partially embedded in the damping structure 5. The proportion that the adjusting structure 6 is located the inside and outside two parts of damping structure 5 is adjustable, adjusts the proportion that the structure 6 imbeds damping structure 5 through the adjustment, just can adjust damping structure 5's whole hardness, can be with the initial damping of adjusting damping structure 5 to realize seat support 3 horizontal hunting's whole flexibility ratio.

Furthermore, an inward-concave receiving groove 23 is formed below the end, away from the rotating shaft 41, of the bottom plate of the fixing seat 2, which is located at the swinging structure 42, and the damping structure 5 is placed in the receiving groove 23, and the length of the damping structure along the front-back direction is slightly greater than the width of the swinging structure 42, so that the supporting of the swinging structure 42 by the damping structure has a margin in the front-back direction. The bottom of the containing groove 23 is provided with a through hole 23-A which is through from the upper line, the damping structure 5 is provided with an inserting channel 5-A which extends upwards from the bottom end, the inserting channel 5-A is communicated with the through hole 23-A of the containing groove 23, the adjusting structure 6 is in a rod-shaped structure, the length of the adjusting structure is larger than that of the inserting channel 5-A, and the adjusting structure 6 is inserted into the inserting channel 5-A from the lower part of the fixed seat 2 through the through hole 23-A.

The hard part 5-1 and the soft part 5-2 are roughly divided by the horizontal line of the top end of the adjusting structure 6, the part of the damping structure 5 from the bottom to the horizontal line of the top end of the adjusting structure 6 is the hard part 5-1, and the part of the damping structure 5 from the top to the horizontal line of the top end of the adjusting structure 6 is the soft part 5-2. The depth of the adjusting structure 6 inserted into the plugging channel 5-A determines the height of the horizontal line at the top end thereof, so that the overall hardness of the damping structure 5 can be adjusted by adjusting the depth of insertion of the adjusting structure 6, and the initial damping of the damping structure 5 can be adjusted.

It should be noted that the damping structures 5 on both sides of the rotating shaft 41 are independent from each other, so the initial damping of the two damping structures 5 is also independent, and some users may have special requirements for left and right swinging, for example, users with dislocated left and right facet joints of the spine need to have higher swinging flexibility in one direction and lower swinging flexibility in the other direction.

The receiving groove 23 has a ring of flange structure 231 extending upward along the periphery of the through hole 23-a, and correspondingly, the plug channel 5-a is formed with a step structure 51 abutting against the top of the flange structure 231, so that the flange structure 231 and the plug channel 5-a have extensibility, and the inner diameters of the flange structure 231 and the plug channel 5-a are approximately the same, the adjusting structure 6 is in threaded fit with the flange structure 231, the adjusting structure 6 is convenient to accurately control the depth of insertion into the plug channel 5-a, and the adjusting structure 6 can be prevented from sliding or even slipping off along the axial direction. In addition, the upper part of the adjusting structure 6, namely the part inserted into the insertion channel 5-A, can be processed with some anti-skid lines or anti-skid salient points on the surface thereof to enhance the friction coefficient between the adjusting structure and the damping structure 5, thereby improving the hardness enhancing amplitude of the hard part 5-1 and expanding the adjusting range of the initial damping; but the force required for adjusting the axial position of the adjusting structure 6 can be increased, so that the anti-skid lines or the anti-skid convex points need to be comprehensively considered and the covering surface and the radial protruding thickness of the adjusting structure 6 need to be reasonably set.

The damping structure 5 extends along the front-back direction, and the cross section of the damping structure is substantially triangular, that is, the left and right side surfaces 5-L of the damping structure 5 are inclined slope surfaces, the two side surfaces 5-L are closed at the top of the damping structure 5 to form a chamfer part 52 which is contacted with and extruded by the swinging structure 42, and the chamfer part 52 can be in circular arc transition or can be in a polygon shape with edges and corners. The shape of the damping structure 5 is arranged to have mainly two functions. A space is reserved between the damping structure 5 with the triangular cross section and the accommodating groove 23, and when the swinging structure 42 extrudes the damping structure 5, the damping structure 5 deforms and gradually becomes flat and wide, so that the reserved space can allow the damping structure 5 to deform. The chamfer part 52 is extruded by the swing structure 42 to form a contact surface which extends along the front-back direction and is in a belt shape, the width of the contact surface is increased along with the swing amplitude, on one hand, the chamfer part 52 can reduce the contact area with the swing structure 42, so that the damping generated by the swing structure 42 is more concentrated, on the other hand, the damping is also increased along with the swing amplitude, the area of the contact surface is also synchronously increased along with the swing amplitude, the stress load of the damping structure 5 is more uniform, the top transitional compression is avoided, and the service life of the damping structure is prolonged.

The bottom surface of the swinging structure 42 is provided with a linear groove 42-A which is formed by being sunken inwards and extends along the front-back direction, two groove walls of the linear groove 42-A are slightly inclined and symmetrical, the shape of the linear groove is matched with that of two inclined side surfaces 5-L of the damping structure 5, the chamfer part 52 of the damping structure 5 is embedded into the linear groove 42-A when the swinging structure 42 swings, the positioning effect on the chamfer part 52 is achieved, the friction sliding of the chamfer part 52 and the swinging structure 42 along the left-right direction can be avoided, and therefore the friction loss to the damping structure 5 is reduced.

When the adjusting structure 6 is pushed to the top of the inserting channel 5-a, the adjusting structures 6 at two sides of the rotating shaft 41 push against the two swinging structures 42 of the rotating shaft 41, so that the seat 3 is locked and cannot swing left and right, and the top end of the adjusting structure 6 can support the top of the damping structure 5. The bottom surface of the swing structure 42 has a circular groove 42-B formed to be depressed inward and communicating with the linear groove 42-a, the circular groove 42-B is depressed inward to a greater depth than the linear groove 42-a, and a portion of the chamfered portion 52 supported by the top end of the regulating structure 6 is fitted into the circular groove 42-B when the swing structure 42 swings, thereby preventing slipping.

The plug channel 5-a does not extend completely through the top of the damping structure 5, so that the adjusting structure 6 is prevented from penetrating out of the top of the damping structure 5 and rigidly colliding with the oscillating structure 42. Therefore, the plugging channel 5-A penetrates through the top end of the damping structure 5 and forms an opening 5-B, the damping structure 5 extends along the periphery of the opening 5-B to form a closing structure 53 which is contracted towards the center of the opening, and when the plugging channel 5-A of the damping structure 5 is completely plugged by the adjusting structure 6, the closing structure 53 is supported at the top end of the adjusting structure 6, so that the top end of the adjusting structure 6 is separated from the swinging structure 42. In addition, the closing structure 53 has a compression amount in the vertical direction, and has a structure of an arch shape that is arched upward from the outer edge to the inner edge, so that the closing structure has a deformation allowance when being pressed by the swing structure 42, and prevents the occurrence of a pressing damage.

In order to avoid the adjustment structure 6 from being excessively inserted to jack up the damping structure 5 upwards, an adhesive layer is coated on the surface of the damping structure 5 attached to the accommodating groove 23 and the flange structure 231, so that the damping structure 5 is adhered to the accommodating groove 23. In addition, in order to facilitate the rotation of the adjusting structure 6, a screw cap 61 is provided at the bottom end of the adjusting structure 6.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments can be modified, or some technical features can be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chair seat mechanism is characterized by comprising a fixed seat and a chair seat, wherein the fixed seat is provided with a rotating shaft which extends along the front-back direction and penetrates through the front side wall and the back side wall of the fixed seat; the seat is positioned above the fixed seat, and the front end and the rear end of the seat are fixedly connected with the front end and the rear end of the rotating shaft respectively; the rotating shaft is connected with a swinging structure which extends along the radial direction of the rotating shaft and is positioned on two sides of the rotating shaft, and a space which allows the swinging structure to swing up and down from a horizontal state is arranged in the fixed seat; the damping structure made of elastic materials is arranged in the fixed seat, the damping structure can be extruded by the swing structure to generate damping when the swing structure swings, and the damping is enhanced along with the increase of the swing amplitude; the damping structure is provided with an adjusting structure for adjusting the initial damping generated by the damping structure on the swing structure.

2. The seat mechanism of claim 1, wherein the adjustment structure is a rigid material, a portion of which is located outside the damping structure and another portion of which is embedded inside the damping structure; the damping structure is limited to be wrapped on the adjusting structure and a hard part with enhanced hardness and a soft part with non-enhanced hardness, wherein the hard part is formed by diffusion of the adjusting structure under the influence of wrapping; the adjusting structure is positioned in the damping structure, and the proportion of the inner part and the outer part of the adjusting structure can be adjusted.

3. The seat mechanism of claim 2, wherein the bottom plate of the fixing base is provided with a concave receiving groove below the end of the swinging structure away from the rotating shaft, and the damping structure is disposed in the receiving groove; the bottom of the accommodating groove is provided with a through hole, the damping structure is provided with an inserting channel which is communicated with the through hole and extends upwards, and the adjusting structure is rod-shaped and is inserted into the inserting channel through the through hole.

4. The seat mechanism of claim 3, wherein the receiving groove has a ring of flange structure extending upward along the periphery of the through hole, and the insertion channel is formed with a step structure abutting against the top of the flange structure; the adjusting structure is in threaded fit with the flange structure.

5. The seat mechanism of claim 3, wherein the damping structure has inclined left and right sides that converge at the top of the damping structure to form a chamfered portion that contacts and is pressed against the swing structure.

6. The seat mechanism of claim 5, wherein the bottom surface of the swing structure has a linear groove formed to be recessed inward and extending in the front-rear direction; when the swinging structure swings, the chamfer part of the damping structure is embedded into the linear groove.

7. The seat mechanism of claim 6, wherein the bottom surface of the swing structure further has a circular groove formed depressed inward and communicating with the linear groove; the depth of the inward recess of the circular groove is greater than that of the linear groove; when the insertion channel of the damping structure is completely inserted by the adjusting structure, the part of the chamfer part supported by the top end of the adjusting structure is embedded in the circular groove when the swinging structure swings.

8. The seat mechanism of claim 7, wherein the plug channel extends through a top end of the damping structure and forms an opening, and the damping structure extends along a periphery of the opening to a converging structure converging toward a center of the opening and having a compression amount in a vertical direction; when the inserting channel of the damping structure is completely inserted by the adjusting structure, the closing-up structure is supported at the top end of the adjusting structure.

9. The seat mechanism of claim 3, wherein the damping structure is attached to the receiving groove and the flange structure by a layer of adhesive.

10. A seat mechanism as claimed in claim 3, wherein the bottom end of the adjustment structure is provided with a screw cap.