CN219537857U - Chair seat capable of being synchronously movably adjusted - Google Patents

Abstract

The utility model discloses a chair seat capable of being synchronously movably adjusted, which comprises a base, a rear seat, a front seat, a seat plate and a supporting rod; the base is arranged on the supporting rod; the back part of the back seat is used for installing the chair back, the front part of the back seat is provided with two connecting plates which are spaced apart from each other, and the two connecting plates are rotationally connected to the two sides of the back part of the base, so that the chair back can be turned back and forth; the two connecting plates are provided with rear connecting arms extending upwards, and the two rear connecting arms are rotatably connected to two sides of the rear part of the seat plate; the rear part of the front seat is rotationally connected with the front part of the base; the front connecting arms which extend downwards are respectively arranged on two sides of the front part of the seat plate, and the two front connecting arms are rotatably connected on two sides of the front part of the front seat. The chair has the advantages that the chair plate can synchronously move backwards, the front part of the chair plate warps upwards and the rear part of the chair plate sinks in the back tilting process, so that the comfort level of a user is improved.

Description

Chair seat capable of being synchronously movably adjusted

Technical Field

The utility model relates to a chair seat, in particular to a chair seat capable of being synchronously movably adjusted.

Background

At present, office chairs used in office occasions or leisure chairs used in daily leisure, wherein a base is an important component, and generally, functional components for adjusting functions of the office chairs, such as tilting gear adjustment, height lifting adjustment and the like, are arranged on the base.

For example, patent application publication number CN201085301 discloses an office chair lifting and tilting adjusting device, which comprises a pneumatic lifting mechanism arranged on a base, a movable backrest pivoted on the base, a handrail arranged on the side surface of the base, and a base lifting and tilting adjusting device arranged on the handrail. The base lifting and backrest tilting adjusting device comprises a left sliding block which is arranged on a left handrail in a sliding way, wherein the left sliding block is connected with one end of a left inhaul cable, the other end of the left inhaul cable is connected with a locking nut arranged on the base, a straight screw rod is sleeved in the locking nut in a penetrating way, and the screw rod is connected with a tilting spring arranged in the base. The side of the screw is provided with external threads, and the corresponding part of the internal threads of the locking nut is provided with a groove. The office chair has the following defects: firstly, when the chair back is adjusted to recline backwards, the distance between the bottom end of the chair back and the rear end of the seat board can be increased, and the back of a user can slide downwards from the chair back, so that the waist cannot be supported, in addition, the sitting posture can be changed along with the chair back, and the comfort of the user is insufficient. And secondly, the office chair is separated from contact with the internal thread on the lock nut through the external thread on the screw rod, so that gear locking is released, and the problems of low transmission efficiency and slow unlocking corresponding speed exist. Furthermore, when the gear locking is released and the chair back can be reclined, the elastic buffering effect is weak, the inclination degree cannot be set in a self-defined manner, the function richness of the office chair is insufficient, and the function integration level is relatively insufficient.

Disclosure of Invention

The utility model aims to provide the chair seat capable of being synchronously movably adjusted, and the chair seat can synchronously move backwards, the front part of the chair seat is upwarp and the rear part of the chair seat is sunk in the back tilting process, so that the comfort level of a user is improved.

The utility model is realized by the following technical scheme.

A chair seat capable of being synchronously movably adjusted comprises a base, a rear seat, a front seat, a seat plate and a supporting rod; the base is arranged on the supporting rod; the back part of the back seat is used for installing the chair back, the front part of the back seat is provided with two connecting plates which are spaced apart from each other, and the two connecting plates are rotationally connected to the two sides of the back part of the base, so that the chair back can be turned back and forth; the two connecting plates are provided with rear connecting arms extending upwards, and the two rear connecting arms are rotatably connected to two sides of the rear part of the seat plate; the rear part of the front seat is rotationally connected with the front part of the base; the front connecting arms which extend downwards are respectively arranged on two sides of the front part of the seat plate, and the two front connecting arms are rotatably connected on two sides of the front part of the front seat.

As a further improvement of the utility model, the back of the chair is turned back and forth to have two dead points, which respectively limit the maximum forward tilting state and the maximum backward tilting state of the back of the chair.

As a further improvement of the utility model, the chair back is in a maximum forward tilting state, the seat plate is in a horizontal state,

as a further improvement of the utility model, the seat back is in a maximum forward tilting state, and the front seat is tilted upward from rear to front.

As a further improvement of the utility model, the base is inclined upward or gradually bent upward from the portion where the support rod is provided to the front end thereof.

As a further improvement of the utility model, a rotating shaft is connected between the two connecting plates, and the rotating shaft penetrates through the two side plates of the base and is positioned in the base; the front end of the rear seat is provided with a platform body which is formed by protruding forwards and extends leftwards and rightwards, the rear end of the base is provided with a concave part which is formed by recessing forwards and avoids the platform body, and the top surface of the platform body is provided with a groove which extends leftwards and rightwards and is embedded with the rotating shaft.

As a further improvement of the utility model, one of the connecting plates is provided with a positioning shaft penetrating through the side plate of the base and extending into the base, the side plate of the rear seat penetrated by the positioning shaft is provided with a limiting groove, the positioning shaft can slide in the limiting groove, and the positioning shaft corresponds to the maximum forward tilting state and the maximum backward tilting state of the chair back respectively when sliding to the two ends of the limiting groove.

As a further improvement of the utility model, the front end of the rear seat is provided with a frame plate which is formed by protruding forwards, and one end of the positioning shaft positioned in the base is connected with the frame plate; the bottom of the frame plate is connected to the platform body, the bottom of the frame plate is provided with a half groove, and the half groove and the groove on the platform body form a perforation allowing the rotating shaft to pass through.

As a further improvement of the utility model, the elastic adjusting mechanism which can be stretched is arranged on the other side of the lifting adjusting mechanism in the base, and the two ends of the elastic adjusting mechanism respectively apply tension to the base and the backseat for driving the backseat to turn forwards and reset.

The utility model has the beneficial effects that:

in the process of leaning back of the chair, the seat board synchronously moves backwards and the front part tilts backwards, the interval between the rear end of the seat board and the bottom end of the chair back is increased, the phenomenon that the waist falls down and cannot be supported due to the fact that the back of a user slides downwards along the chair back is avoided, thighs are lifted when the front part of the seat board tilts backwards, and the sitting posture of the user is more comfortable.

Drawings

Preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings, to facilitate understanding of the objects and advantages of the present utility model, wherein:

FIG. 1 is a schematic view of a seat structure;

FIG. 2 is a schematic view of the seat in a maximum reclined back condition;

FIG. 3 is a schematic view of the seat in a maximum reclined position of the back;

FIG. 4 is a schematic view of the base and rear seat in a disassembled state;

FIG. 5 is a schematic view of the internal structure of the base;

FIG. 6 is a schematic view of the structure of the elevation adjustment mechanism and the support bar;

FIG. 7 is a schematic view of a tilt shift adjustment mechanism;

FIG. 8 is a schematic structural view of a pitch and lean tightness adjustment mechanism;

fig. 9 is a schematic cross-sectional view of the adjustment mechanism of pitch tightness.

Detailed Description

The utility model is described in further detail below with reference to the drawings and the examples.

The terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible in this specification are defined with respect to the configurations shown in the drawings, and the terms "inner" and "outer" refer to the relative concepts of the terms toward or away from the geometric center of a particular component, respectively, and thus may be changed accordingly depending on the location and use state of the component. These and other directional terms should not be construed as limiting terms.

Referring to fig. 1-9, a seat comprises a base 1, a rear seat 2, a front seat 3, a seat board 4 and a support rod 5, wherein the base 1 is arranged on the support rod 5, the front part of the rear seat 2 is rotatably connected to the rear part of the base 1, and the rear part of the rear seat 2 is used for installing a chair back (not shown in the figure), so that the chair back can be turned back and forth, and the function of leaning back and forth is realized. The rear part of the front seat 3 is rotatably connected with the front part of the base 1, the seat plate 4 is arranged above the base 1, the front part of the seat plate is rotatably connected with the front part of the front seat 3, and the rear part of the seat plate is rotatably connected with the front part of the rear seat 2.

In this embodiment, the base 1, the front seat 3 and the seat are all in a flat hollow structure, so that the overall thickness of the seat is relatively thin, and the space occupied by the seat in this embodiment after being assembled into a complete chair is limited, so that the overall structure of the chair is more simplified, and the space arrangement of other functional structures of the chair is also facilitated. The rear seat 2 is gradually spread out from front to rear to both sides and is bent upward so that the width and position of the rear portion thereof can be adapted to the seat back to be mounted.

In the present embodiment, the front part of the rear seat 2 has two connecting plates 21 spaced apart from each other, and the two connecting plates 21 are respectively located outside the two sides of the rear part of the base 1 and are rotatably connected to the two sides of the rear part of the base 1. The upper parts of the two connecting plates 21 are provided with rear connecting arms 22 extending upwards, and the top ends of the two rear connecting arms 22 are respectively connected with the left side and the right side of the rear part of the seat plate 4 in a rotating way. The front connecting arms 41 extending downward are respectively arranged on the left and right sides of the front part of the seat plate 4, and the two front connecting arms 41 are respectively connected on the two sides of the front part of the front seat 3 in a rotating way.

The left and right sides of the front and rear portions of the seat plate 4 are supported by the front connecting arm 41 and the rear connecting arm 22, respectively, and the supported portions are located at or near four corners of the seat plate 4, so that the structural stability of the seat plate 4 is good, and the center of gravity of a user sitting on the seat plate 4 is not deviated from the supporting range under normal conditions. In this embodiment, the back seat 2 is turned back and forth to enable the chair back to have a forward tilting and backward tilting function, and when the back of the user is supported on the chair back and leans backward, the base 1 will not rotate or shift due to the arrangement on the support rod 5, and the rest components of the chair seat will be linked due to the connection characteristic of the rotating connection. The rear seat 2 is turned backwards, so that the rear connecting arm 22 is turned backwards, the seat board 4 is integrally moved backwards under the drive of the rear connecting arm 22, and the rear end is sunk. As the base 1 is stationary, the front seat 3 is turned back around the front of the base 1, tilting the front of the seat plate 4 in conjunction with the front connecting arm 41. Therefore, in the process of reclining the chair back, the seat board 4 synchronously moves backwards and the front part tilts backwards, the distance between the rear end of the seat board 4 and the bottom end of the chair back is increased, the phenomenon that the waist falls down and cannot be supported due to the fact that the back of a user slides downwards along the chair back is avoided, and the thighs are lifted while the user leans backwards due to the fact that the front part of the seat board 4 tilts backwards can be caused, so that the sitting posture of the user is more comfortable.

In this embodiment, the back of the chair has two dead points for the back of the chair to turn back and forth, so that the back of the chair 2 and the back of the chair turn back and forth are limited by the scope, and these two dead points of turning back define the maximum forward tilting state and the maximum backward tilting state of the back of the chair respectively.

When the chair back is in the maximum forward tilting state, the seat board 4 is in a horizontal state, the maximum forward tilting state corresponds to the sitting posture of the user sitting at the end, and the user is usually in a working state or in a normal sitting posture under the sitting posture, so that the horizontal state of the seat board 4 is more suitable for the sitting posture of the user.

In this embodiment, the chair back is in the maximum forward tilting state, and the front seat 3 is tilted upward from back to front, so that on one hand, the space occupied by the front portion of the chair seat can be reduced, and the legs, particularly the lower legs, of the user can have larger movable space, and on the other hand, the length of the front connecting arm 41 in the vertical direction can be shortened, so that the supporting effect obtained by the front portion of the seat plate 4 is more stable.

In this embodiment, the base 1 is inclined upward or gradually curved upward from the portion where the support rod 5 is disposed to the front end thereof, so that the seat forms a structure gradually folded from the middle portion to the front end, so that the direction change from the middle portion of the base 1 to the front portion of the seat plate 4 is gentle, and in addition, the seat forms a structure similar to a triangle on the whole structure, so that the firmness and stability of the whole structure of the seat are more reliable.

In this embodiment, a rotating shaft 23 is connected between two connecting plates 21 of the rear seat 2, the rotating shaft 23 is connected at a position of the connecting plates 21, the rotating shaft 23 penetrates through two side plates of the base 1 and is located in the base 1, and the rotating shaft 23 can rotate around a central axis of the rotating shaft so that the rear seat 2 can turn back and forth. The front end of the rear seat 2 is provided with a platform body 24 which is formed by protruding forwards and extends leftwards and rightwards, the rear end of the base 1 is provided with a concave part which is formed by recessing forwards and avoids the platform body 24, and the platform body 24 and the concave part are matched in shape, so that the bottom surfaces of the base 1 and the rear seat 2 basically present a flat surface in a maximum forward tilting state. The top surface of the platform body 24 is provided with a groove 241 extending left and right, the rotating shaft 23 is embedded in the groove 241, the platform body 24 and the groove 241 on the top surface thereof play a role in providing radial support for the rotating shaft 23, the situation that the rear seat 2 frequently overturns back and forth or is bent and deformed after long-term use is avoided, the protection effect is achieved, and in addition, the arrangement of the platform body 24 and the concave part also enables the structure between the base 1 and the rear seat 2 to be more compact.

Other rotationally connected parts, such as the front connecting arm 41 and the front part of the front seat 3, the rear part of the front seat 3 and the front part of the base 1, the rear connecting arm 22 and the rear part of the seat board 4, are rotationally connected through shafts, and the structural arrangement is basically the same as the rotating shaft 23 between the two connecting plates 21, and will not be described herein.

In the present embodiment, one of the connection plates 21 is provided with a positioning shaft 25, and the positioning shaft 25 extends in the left-right direction and is located above the rotation shaft 23, which penetrates the corresponding side plate of the base 1 and protrudes into the inside of the base 1. The base 1 is provided with the spacing groove 12 by the part that locating shaft 25 runs through, and the spacing groove 12 takes the pivot 23 as center of rotation's convex structure, and locating shaft 25 can slide in spacing groove 12, and the biggest forward tilting state and the biggest backward tilting state of the corresponding back of the chair respectively when the locating shaft slides to the both ends of spacing groove 12, and the both ends of spacing groove 12 have played two dead points effects of back of the chair upset back of the chair forward and backward.

In this embodiment, the front end of the rear seat 2 has a frame plate 26 protruding forward at the middle part thereof, and one end of the positioning shaft 25 located in the base 1 is fixedly connected to the frame plate 26, so that both ends of the positioning shaft 25 have fixing points, the positioning shaft 25 is more firm, the shaking phenomenon is not easy to occur, and the bending deformation is not easy to occur. The bottom of the shelf 26 is connected to the top surface of the platform 24, so that the structure of the shelf 26 is firm, the bottom of the shelf 26 has a half groove 261, and the half groove 261 and the groove 241 on the platform 24 form a through hole allowing the rotation shaft 23 to pass through. The shelf plate 26 not only plays a role in fixedly connecting the positioning shaft 25, but also plays a role in radially supporting the rotating shaft 23, so that the stability of the rotating shaft 23 is better.

The chair seat in the embodiment is a multifunctional chair seat, not only can support the forward leaning and backward leaning functions of the chair back, but also has the functions of adjusting the leaning gear of the chair back, adjusting the height and the lifting of the chair seat and adjusting the leaning tightness of the chair back. When the chair back leans back and forth, the front seat 3 and the rear seat 2 can be turned back and forth, only the base 1 is static, and in order to improve the implementation stability of the functions, the adjusting mechanisms of the functions must be integrated in the base 1. In addition, since the seat plate 4 is disposed above the base 1, a certain space must be reserved between the seat plate and the base 1 to avoid interference collision between the seat plate 4 and the base 1 when the seat plate is tilted forward and backward, the base 1 is in a hollow structure with flat structure and limited thickness, and therefore the layout of the adjusting mechanism for these functions in the base 1 is very important for the effect and stability of the functions.

In this embodiment, the supporting rod 5 is set as a telescopic supporting rod, and the top end of the lifting supporting rod 5 penetrates from the middle position of the bottom of the base 1 and is located inside the base 1. The region of the middle part in the base 1 corresponding to the lifting support rod 5 is provided with a lifting adjusting mechanism, the lifting adjusting mechanism is provided with a lifting adjusting stay wire 61, the lifting adjusting stay wire 61 penetrates out of the base 1 and is connected with a lifting adjusting spanner 62, a user can pull the lifting adjusting mechanism through breaking the lifting adjusting spanner 62, and the lifting adjusting mechanism acts on the top end of the lifting support rod 5 to unlock the lifting adjusting mechanism and perform lifting adjustment. The gear lever 13 is arranged in the base 1, the gear lever 13 is parallel to the rotating shaft 23 and can axially move, one connecting plate 21 of the rear seat 2 is provided with a positioning shaft 25, the other connecting plate 21 is provided with a plurality of gear holes 27, and the gear holes 27 can be in plug-in fit with the gear lever 13, so that the rear seat 2 cannot turn back and forth, different back and forth turning angles of the chair back are locked, and different gears of the leaning back are limited. One side of the lifting adjusting mechanism in the base 1 is provided with an adjusting mechanism of a tilting gear, the adjusting mechanism of the tilting gear is provided with a gear adjusting stay wire 71, the gear adjusting stay wire 71 penetrates out of the base 1 and is connected with a gear adjusting spanner 72, and a user can pull the adjusting mechanism of the tilting gear through pulling the gear adjusting spanner 72, so that the gear rod 13 is driven to axially move, the gear rod 13 and the corresponding gear hole 27 are in plug-in fit or separation, and accordingly the back of the chair is locked and unlocked in a forward-backward tilting mode. The other side of the lifting adjusting mechanism in the base 1 is provided with a tilting tightness adjusting mechanism, the tilting tightness adjusting mechanism can be stretched, two ends of the tilting tightness adjusting mechanism respectively apply tension to the base 1 and the backseat 2, the stretching amplitude of the tilting tightness adjusting mechanism in the process that the backseat 2 is turned backwards, namely the back of the chair is tilted, is gradually increased, the tension of the tilting tightness adjusting mechanism on the base 1 and the backseat 2 is also gradually increased, a buffering effect is achieved in the process that a user leans backwards, the tilting tightness adjusting mechanism is provided with an adjusting rod 84, the adjusting rod 84 penetrates out of the base 1, and the user can adjust the stretching degree of the tilting tightness adjusting mechanism by rotating the adjusting rod 84, so that the tilting tightness of the back of the chair is adjusted.

In this embodiment, the base 1 is divided into a middle area and two side areas on two sides of the row, and a lifting adjusting mechanism, a tilting gear adjusting mechanism and a tilting tightness adjusting mechanism are respectively arranged in the middle area and the two side areas, so that the height, the tilting gear and the tilting tightness of the chair seat can be adjusted, multiple functions are inherited in the base 1 with a relatively compact space, and the functions are not interfered with each other, and a user can conveniently and easily adjust various functions according to needs by arranging the lifting adjusting stay wire 61, the gear adjusting stay wire 71 and the adjusting rod 84, so that the operation is optimized, and the experience of the user is improved.

In this embodiment, the lift adjusting wire 61 and the gear adjusting wire 71 are inserted into the front seat 3 from the front portion of the base 1 and then are inserted out from the front portion of the front seat 3, the front portion of the seat plate 4 has a through slot 42 allowing the lift adjusting wire 61 and the gear adjusting wire 71 to pass through, the lift adjusting wire 61 and the gear adjusting wire 71 extend to the top surface of the seat plate 4, and extend out from two sides of the seat plate 4 respectively, and are connected with a lift adjusting wrench 62 and a gear adjusting wrench 72 respectively, and the lift adjusting wrench 62 and the gear adjusting wrench 72 are located outside two sides of the base 1. The wiring line enables the lifting adjusting wrench 62 and the gear adjusting wrench 72 to be arranged on two sides of the seat, the user can bend the lifting adjusting wrench 62 or the gear adjusting wrench 72 by sitting on the seat board 4 with both hands, the operation is convenient, the wrong wrench can be avoided when the user adjusts the lifting adjusting wrench 62 and the gear adjusting wrench 72 on two sides in a separated mode, in addition, the wiring mode that the lifting adjusting stay wire 61 and the gear adjusting stay wire 71 are penetrated out by the front seat 3 can be avoided, and the two are exposed between the base 1 and the seat board 4.

In this embodiment, two positioning members 14 are disposed in the base 1, which allow the lifting adjusting stay wire 61 and the gear adjusting stay wire 71 to pass through, and are respectively used for tensioning the part of the gear adjusting stay wire 71 connected with the lifting adjusting mechanism and the part of the gear adjusting structure connected with the tensioning gear adjusting stay wire 71, so that the wiring in the base 1 is orderly, the situation that the two stay wires are mutually wound or form a coil is avoided, and the tensioning of the two stay wires is beneficial to the pulling action of the lifting adjusting mechanism and the tilting adjusting mechanism, which can rapidly correspond to the stay wires.

In this embodiment, the part of the lifting adjusting stay wire 61/gear adjusting stay wire 71 between the positioning member 14 and the lifting adjusting wrench 62/gear adjusting wrench 72 is wrapped with a protective sleeve, and the protective sleeve is a hose, so that the stay wire needs to pass through the front seat 3 and then extend to the top surface of the seat board 4, and abrasion is easy to occur, and the protective sleeve can play a role in protecting the stay wire.

In this embodiment, for the lifting support rod 5, the top end of the lifting support rod is provided with a valve core 51, the valve core 51 is located in the base 1, when the valve core 51 is pressed down, the telescopic support rod is unlocked to enable height lifting adjustment, and after the valve core 51 is released, the telescopic support rod is locked to enable height lifting adjustment. The lifting adjusting mechanism comprises a turnover structure 63 and a turnover reset structure (not shown in the figure), the turnover structure 63 is provided with two support arms 631, one support arm 631 is connected with the lifting adjusting stay wire 61, a user breaks the lifting adjusting spanner 62, the lifting adjusting stay wire 61 pulls the support arm 631 to enable the turnover structure 63 to rotate, so that the other support arm 631 is driven to swing, the support arm 631 can press or loosen the valve core 51 under the rotation of the turnover structure 63 to enable the lifting support rod 5 to be locked or unlocked, the turnover reset structure is used for driving the turnover structure 63 to rotate and reset, namely, the user can drive the support arm 631 to loosen the valve core 51 to lock the telescopic support rod after loosening the lifting adjusting spanner 62 in the turnover reset structure. The flip reset structure may be provided as a torsion spring disposed on the flip structure 63.

In this embodiment, the gear adjusting mechanism for adjusting the tilting gear of the chair back includes a translation structure and a rotation structure 73 disposed in the base 1, where the translation structure can move along a straight line, the rotation structure 73 has a first support arm 731 and a second support arm 732, the straight line movement of the translation structure is used on the first support arm 731 and can drive the rotation structure 73 to rotate, and the second support arm 732 acts on the gear lever 13 and can drive the gear lever 13 to move along the axial direction thereof, and the gear lever is inserted into or separated from the corresponding gear hole 27, so as to implement gear locking and unlocking.

In this embodiment, the shift adjusting wire 71 and the shift lever 13 can be connected in a driving manner by the first arm 731 and the second arm 732 of the translation structure and the rotation structure 73, and the user can drive the shift lever 13 by pulling the shift adjusting wrench 72 to control the shift adjusting wire 71, so that the shift lever 13 and the shift hole 27 are inserted into or separated from each other.

When the gear lever 13 is in plug-in fit with the gear hole 27, the gear locking function is achieved, the supporting function on the chair back is achieved when a user backs the chair back, higher stress load is needed, specifically, the caliber of the gear lever 13 is not required to be too thin to improve the rigidity of the gear lever, and the length of the gear lever 13 inserted into the gear hole 27 is not required to be too short, so that the supporting strength of the gear lever 13 on the chair back is increased. However, the maximum angle of the wrenching of the gear adjusting wrench 72 is approximately 90 °, so that the pulling length of the gear adjusting wrench 72 to pull the gear adjusting wire 71 is limited. Based on this, in the present embodiment, the length of the first arm 731 is greater than that of the second arm 732, so that the axial moving distance of the gear lever 13 is greater than the pulling distance of the gear adjusting wire 71, so that the situation that the gear lever 13 cannot be pulled out from the gear hole 27 can be avoided, otherwise, the length of the portion of the gear lever 13 inserted into the gear hole 27 can be maximized, so that the gear lever 13 provides a more stable and powerful supporting strength for the chair back.

In this embodiment, the translation structure includes a connecting piece 74, a translation elastic reset structure 75, and a limiting structure 76, where one end of the gear adjusting stay 71 in the base 1 is connected to the connecting piece 74, the translation elastic reset structure 75 may be specifically set as a compression spring, and sleeved outside the gear adjusting stay 71, two ends of the translation elastic reset structure 75 are respectively supported on the connecting piece 74 and the first support arm 731, and when the gear lever 13 is inserted in the gear hole 27, the gear adjusting stay 71 and the translation elastic reset structure 75 are substantially perpendicular to the first support arm 731. A limit structure 76 is provided on the bottom plate of the base 1, which allows the gear-position adjusting wire 71 and the translational elastic return structure 75 to pass through and can be abutted against the connecting piece 74. When the user pulls the gear adjusting wrench 72, the gear adjusting stay 71 pulls the positioning member 14 to move towards the limiting structure 76, the translational elastic reset structure 75 is compressed, so that the translational elastic reset structure is pushed to the first support arm 731, the rotating structure 73 is rotated, the second support arm 732 drives the gear lever 13 to axially move and separate from the gear hole 27, and the limiting structure 76 and the connecting member 74 abut against each other to perform a limiting function.

The shift position adjusting wire 71 is compressed when the connecting member 74 is pulled, so that the first arm 731 is pushed by the elastic force generated by the translational elastic reset structure 75, however, when the first arm 731 rotates, the translational elastic reset structure 75 is relatively stretched, so that the elastic force generated by the first arm 731 is weakened, and although the compressed amplitude of the translational elastic reset structure 75 is larger than the stretched amplitude, the elastic force generated by the translational elastic reset structure 75 on the first arm 731 is definitely limited, so that the rotation speed of the rotation structure 73 is slow, the speed of the second arm 732 driving the shift lever 13 to axially move is slow, and the corresponding speed of the shift position unlocking is slow. Based on this, in the present embodiment, the first support arm 731 has a through passage 731a, the through passage 731a allows the gear adjusting wire 71 to pass therethrough, when the user pulls the gear adjusting wrench 72, the rotation structure 73 rotates and the gear lever 13 gradually disengages from the gear hole 27, the angle of the gear adjusting wire 71 located in the through passage 731a with respect to the portion between the first support arm 731 and the connecting member 74 gradually increases, that is, a portion of the gear adjusting wire 71 is bent, the gear adjusting stay wire 71 plays an additional pulling role on the connecting piece 74, and the pulling role is reinforced along with the increase of the folding angle, so that the translational elastic reset structure 75 can be rapidly compressed to the maximum extent, then the elastic force applied by the translational elastic reset structure 75 to the first support arm 731 is maximized, the rotation speed of the rotating structure 73 is improved, and the speed that the second support arm 732 drives the gear lever 13 to axially move is improved, so that the rapid corresponding effect of gear unlocking is realized.

In addition, in the present embodiment, when the shift lever 13 is inserted into the shift hole 27, the folded angle of the portion of the shift position adjusting wire 71 in the through passage 731a and the remaining portion is zero, that is, the portion from the positioning member 14 to the connecting member 74 of the shift position adjusting wire 71 is in a straight line structure.

In this embodiment, the limiting structure 76 is configured as a hollow tubular structure with two open ends, one of the ports of the tubular structure is used for abutting against and limiting the connecting piece 74, the gear adjusting stay 71 and the translational elastic restoring structure 75 penetrate out from the other port of the tubular structure, and the tubular limiting structure 76 can better maintain the directionality of the gear adjusting stay 71 and the translational elastic restoring structure 75, so as to avoid the occurrence of situations that bending and the like are unfavorable for pushing the first support arm 731.

In this embodiment, set up the backup pad 15 that has the through-hole in the base 1, gear lever 13 passes the curb plate of base 1 and the through-hole of backup pad 15, and backup pad 15 plays the supporting role to gear lever 13, avoids gear lever 13 to appear the axial deviation's condition, improves its accuracy of grafting into gear hole 27. The gear lever 13 is provided with a gear elastic reset structure 132 for driving the gear lever 13 to axially move and reset and insert into the gear hole 27, the gear elastic reset structure 132 can play a role in elastic reset, and after the gear adjusting wrench 72 is loosened, a user can enable the gear lever 13 to quickly insert into the gear hole 27 to realize locking.

In this embodiment, the second arm 732 has an opening 732a for allowing the gear lever 13 to pass therethrough, and the opening 732a extends from the end of the second arm 732 to the middle thereof to form a pincer-like structure. The gear lever 13 is provided with a radially protruding flange structure 131, the radially protruding flange structure is abutted to a second support arm 732, the rotation of the second support arm 732 acts on the flange structure 131 to drive the gear lever 13 to axially move, the gear elastic reset structure 132 is provided as a pressure spring which is sleeved outside the gear lever 13, two ends of the pressure spring respectively support the flange structure 131 and the support plate 15, when the gear lever 13 is pulled out of the gear hole 27, the gear elastic reset structure 132 is compressed, and when the gear adjusting wrench 72 is released, the elastic force applied to the flange structure 131 by the gear elastic reset structure 132 can drive the gear lever 13 to axially move and be inserted into the gear hole 27.

In this embodiment, the adjusting mechanism of the tilting tightness includes a first connector 81, a second connector 82, and an elastic structure 83, where the first connector 81 is located on the rear seat 2, the second connector 82 is located on the base 1, the elastic structure 83 connects the first connector 81 and the second connector 82, the elastic structure 83 can be stretched to provide a tensile force to the first connector 81 and the second connector 82, so that the rear seat 2 can be turned backwards, i.e. a buffering effect is provided in the process of tilting the back of the chair, the back of the user leaves the back of the chair, and the rear seat 2 can be driven to turn forwards for resetting, so that the chair back is restored to the maximum tilting state. The adjusting rod 84 penetrates through the second connector 82 and is in threaded fit with the second connector 82, and a user can adjust the distance between the first connector 81 and the second connector 82 by rotating the adjusting rod 84, so that the degree of tightness of tilting of the chair back is controlled.

In this embodiment, the base 1 is provided with the positioning frame 16 on the bottom plate thereof, the adjusting rod 84 is provided with the stopping member 841, and the stopping member 841 is rotatably sleeved on the adjusting rod 84, so that the stopping member 841 can rotate around the adjusting rod 84 but cannot move along the axial direction of the adjusting rod 84, and the stopping member 841 can be abutted against the front side of the positioning frame 16.

In this embodiment, the elastic structure 83 is specifically configured as an extension spring, and the rear portion and the front portion of the extension spring are respectively fixed on the first connector 81 and the second connector 82, and the middle portion of the extension spring is suspended and is stretched and deformed during the reclining process of the chair back.

In this embodiment, the first connector 81 is rotatably sleeved on the positioning shaft 25, so when the rear seat 2 is turned backwards, the positioning shaft 25 drives the first connector 81 to move, and the movement track of the positioning shaft 25 is adapted to the shape of the limiting groove 12, i.e. the first connector 81 forms a circular arc linear movement track. The inclination tightness adjusting mechanism defines a reference line, which is a connecting line between the part of the first connecting joint 81 sleeved on the positioning shaft 25 and the abutting piece 841, and the direction of the reference line is changed when the base 1 turns back and forth due to the circular arc linear moving track of the first connecting joint 81. The elastic structure 83 of this embodiment is provided as an extension spring, which has elasticity in the axial direction and also has a certain elasticity in the radial direction based on its structural characteristics, and since the direction of the reference line changes during the backward overturning of the rear seat 2, this will cause the extension spring to be not only stretched in the axial direction, but also to undergo a certain magnitude of bending deformation in the radial direction, that is, the extension spring is deformed from a straight structure to an arc structure in the overall structure, so that the deformation of the extension spring in the axial direction will apply an axial pulling force to the first connector 81 and the second connector 82, and the deformation in the radial direction will also apply a radial pulling force to the first connector 81 and the second connector 82. Because the stopping piece 841 is abutted against the front side of the positioning frame 16, the tension of the tension spring on the radial direction of the second connector 82 can enable the positioning frame 16 and the stopping piece 841 to generate interaction pressure, the tension of the tension spring on the radial direction of the second connector 82 can enable the stopping piece 841 to generate a moving trend of sliding on the rear side of the positioning frame 16, and the pressure exerted by the positioning frame 16 and the stopping piece 841 mutually can generate static friction force to counteract the action of the radial tension force, so that the stopping piece 841 cannot slide on the positioning frame 16, and therefore the swing of the adjusting rod 84 relative to the base 1 can be avoided, particularly, when a user keeps the gear unlocking, under the condition of the free swing motion (repeated forward and backward tilting), the adjusting rod 84 frequently swings back and forth, noise generated by the friction sliding of the stopping piece 841 along the positioning frame 16 can certainly cause structural stability to be weakened, and experience and comfort of the user are affected. The tension of the tension spring in the radial direction generated on the first coupling head 81 does not adversely affect the first coupling head 81 because even if the direction of the reference line is not changed, the first coupling head 81 also rotates around the positioning shaft 25 during the rotation of the positioning shaft 25 around the rotating shaft 23, and in addition, the rotating friction can be reduced by providing a bearing between the first coupling head 81 and the rotating shaft 23 and applying lubricating oil.

The first connector 81 and the second connector 82 are used for fixing the rear part and the front part of the tension spring, the rear part and the front part of the tension spring are of a cylindrical structure, the surface of the cylindrical structure is provided with a spiral extending groove 8a, and the front part and the rear part of the tension spring are respectively embedded in the corresponding grooves 8a, so that the front part and the rear part of the tension spring are fixed on the second connector 82 and the first connector 81 more firmly, and the phenomenon of separation in the tension process is avoided.

In this embodiment, the rear end of the second connector 82 has a first limiting structure 85, and the first limiting structure 85 can abut against the abutment 841 to limit the maximum distance between the first connector 81 and the second connector 82, and when the first limiting structure 85 abuts against the abutment 841, the chair back leans to be in the tightest state.

More specifically, in this embodiment, the positioning frame 16 is disposed on the inner surface of the bottom plate of the base 1, the middle part of the positioning frame 16 has an opening allowing the adjusting rod 84 to pass through, the positioning frame 16 is formed with the first positioning portions 161 on both sides of the opening thereof, the middle part of the stopping member 841 is provided with a through hole allowing the adjusting rod 84 to pass through, the stopping member 841 has side wing portions 842 extending in both sides, and the two side wing portions 842 can respectively abut against the front sides of the two first positioning portions 161, so as to form a laterally symmetrical abutting manner, thereby improving the stability of the overall structure.

The first limiting structure 85 includes two limiting arms 851 extending forward, the expansion length of the two side wing portions 842 of the stopping member 841 in the left-right direction is greater than the width of the stopping member 841 in the left-right direction, the two limiting arms 851 are located outside two sides of the positioning frame 16, and the rear ends of the two limiting arms 851 can respectively abut against the two side wing portions 842, so that adjustment limiting is achieved.

In this embodiment, the end of the adjusting rod 84 located in the base 1 has a second limiting structure 86, and the second limiting structure 86 can abut against the end of the second connector 82 facing the first connector 81 to limit the minimum distance between the first connector 81 and the second connector 82, and when the second limiting structure 86 abuts against the second connector 82, the chair back tilts to be in the tightest state. In this embodiment, the second limiting structure 86 is a latch structure that vertically penetrates the adjusting rod 84.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme recorded in each embodiment can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (9)

1. The chair seat capable of being synchronously and movably adjusted is characterized by comprising a base, a rear seat, a front seat, a seat plate and a supporting rod; the base is arranged on the supporting rod; the back part of the back seat is used for installing the chair back, the front part of the back seat is provided with two connecting plates which are spaced apart from each other, and the two connecting plates are rotationally connected to the two sides of the back part of the base, so that the chair back can be turned back and forth; the two connecting plates are provided with rear connecting arms extending upwards, and the two rear connecting arms are rotatably connected to two sides of the rear part of the seat plate; the rear part of the front seat is rotationally connected with the front part of the base; the front connecting arms which extend downwards are respectively arranged on two sides of the front part of the seat plate, and the two front connecting arms are rotatably connected on two sides of the front part of the front seat.

2. The synchronously movable adjustable seat of claim 1, wherein the back flip has two dead points defining a maximum reclined state and a maximum reclined state of the back, respectively.

3. The synchronously movable adjustable seat of claim 2, wherein the seat plate is in a horizontal position when the seat back is in a maximum forward reclined position.

4. The synchronously movable adjustable seat of claim 2, wherein the seat back is at a maximum forward tilt and the front seat is tilted upward from back to front.

5. The synchronously adjustable seat of claim 4, wherein the base is upwardly inclined or gradually upwardly curved from the location where the support bar is disposed to the front end thereof.

6. The synchronously movably adjustable seat of claim 2, wherein a rotating shaft is connected between the two connecting plates, the rotating shaft penetrates through the two side plates of the base and is positioned in the base; the front end of the rear seat is provided with a platform body which is formed by protruding forwards and extends leftwards and rightwards, the rear end of the base is provided with a concave part which is formed by recessing forwards and avoids the platform body, and the top surface of the platform body is provided with a groove which extends leftwards and rightwards and is embedded with the rotating shaft.

7. The synchronously movable adjustable seat of claim 6, wherein one of the connecting plates has a positioning shaft penetrating through a side plate of the base and extending into the base, the side plate of the rear seat penetrated by the positioning shaft is provided with a limit groove, the positioning shaft can slide in the limit groove, and the positioning shaft corresponds to a maximum forward tilting state and a maximum backward tilting state of the seat back respectively when sliding to two ends of the limit groove.

8. The synchronously adjustable seat according to claim 7, wherein the front end of the rear seat is provided with a frame plate which is formed by protruding forwards, and one end of the positioning shaft in the base is connected with the frame plate; the bottom of the frame plate is connected to the platform body, the bottom of the frame plate is provided with a half groove, and the half groove and the groove on the platform body form a perforation allowing the rotating shaft to pass through.

9. The chair seat capable of being adjusted synchronously according to claim 1, wherein the elastic adjusting mechanism capable of being stretched is arranged on the other side of the lifting adjusting mechanism in the base, and two ends of the elastic adjusting mechanism respectively apply pulling force to the base and the rear seat for driving the rear seat to turn forwards and reset.