CN220069258U - Chair - Google Patents

Abstract

The utility model discloses a seat, which comprises a seat board mechanism, a back rest mechanism and a linkage assembly, wherein the seat board mechanism comprises a seat board and a chassis assembly, the chassis assembly comprises a supporting seat, and the seat board can move up and down relative to the supporting seat; the backrest mechanism comprises a first support body, a second support body and a backrest, wherein the lower end of the first support body is hinged with the rear end of the seat board, the upper end of the first support body is hinged with the lower end of the second support body, the backrest is connected to the second support body, the first support body comprises a first shell, and a transmission gear is arranged in the first shell; the rear end of bedplate is equipped with the first gear with drive gear looks adaptation, and the lower extreme of second supporter is equipped with the second gear with drive gear looks adaptation, and the linkage subassembly includes the drive seat, and the one end and the bedplate of drive seat are articulated, and another one end is connected with first supporter, drives the drive seat and rotates when the bedplate goes up and down, and the drive seat drives first supporter and rotates this moment. The utility model can ensure the fixation of the back-rest running track and improve the assembly efficiency of the seat.

Description

Chair

Technical Field

The utility model relates to the field of seats, in particular to a seat.

Background

The seat is a common article in life and is widely applied to various occasions. At present, people not only pursue the comfort level of the seat, but also pay more attention to the influence of the seat on the human health. When the seat with the seat backs in linkage is used, the back rest can move forwards/backwards in parallel, so that the back of people with different body types can be well supported, and a user can keep a correct sitting posture on the seat.

The Chinese patent publication number is: CN215304359U, publication date: 2021-12-28 discloses an adaptive seat depth adjustment seat in which the seat is movably connected to a fixed support by a first link assembly such that the seat can be raised or lowered relative to the fixed support; the chair back is movably connected with the fixed support piece through the second connecting rod assembly, so that the chair back can translate back and forth in the depth direction of the chair seat, the application realizes that the chair back translates to follow the back of a human body through two groups of four-connecting rod structures, and the hinge points of the two four-connecting rod structures are more than ten places, so that the assembly difficulty is high, the manufacturing cost is high, and the popularization is not facilitated; in addition, the two four-bar mechanisms have more kinematic pairs, so that error accumulation is large, and particularly after long-term use, deviation can occur on the running track, and the supporting effect is influenced.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a seat, wherein the back can move forwards/backwards in parallel through a first gear, a second gear and a transmission gear, and the gears have the advantages of high transmission precision, stable transmission and the like, so that the back can be ensured to move forwards/backwards along a fixed track; the installation degree of difficulty of gear is less, can promote the packaging efficiency of seat, in addition, when the seat breaks down, is convenient for maintain the seat.

The technical scheme of the utility model is realized as follows:

a seat, comprising:

the seat board mechanism comprises a seat board and a chassis assembly, the chassis assembly comprises a supporting seat for inserting an air rod, the seat board is connected above the supporting seat, and the seat board can move up and down relative to the supporting seat;

the backrest mechanism comprises a first support body, a second support body and a backrest, wherein the lower end of the first support body is hinged with the rear end of the support seat, the upper end of the first support body is hinged with the lower end of the second support body, the backrest is vertically connected to the second support body, the first support body comprises a first shell with a first cavity, and a transmission gear is rotationally arranged in the first shell;

the first gear is fixedly arranged at the rear end of the supporting seat, and the transmission gear is meshed with the first gear;

the second gear is fixedly arranged at the lower end of the second support body, the transmission gear is meshed with the second gear, and the transmission ratio of the first gear to the transmission gear is the same as that of the second gear to the transmission gear;

the linkage assembly comprises a transmission seat, one end of the transmission seat is hinged to the seat plate, the other end of the transmission seat is rotationally connected with the first support body, the seat plate drives the transmission seat to rotate when being lifted, the transmission seat drives the first support body to rotate at the moment, and when the first support body rotates, the transmission gear drives the second gear to rotate, so that the second support body is driven to rotate, the rotation direction of the second support body is opposite to the rotation direction of the first support body, and the backrest keeps translating in the horizontal direction.

In this scheme, can make the bedplate descend when the human body sits on the seat, then the bedplate drives the transmission seat and rotates down and remove, then the transmission seat drives first supporter and rotates down, the transmission gear that is located the inside of first supporter at this moment anticlockwise rotates, the second supporter descends and forward horizontal migration, it can be understood that transmission gear keeps meshing and synchronous counter-rotation with first gear, second gear when rotating, because first gear and transmission gear's transmission ratio is the same with second gear and transmission gear's transmission ratio for the angle of second supporter remains unchanged, the guarantee back is in vertical state or has been predetermine inclination constantly.

Preferably, a first connecting seat is fixedly arranged at the rear end of the supporting seat, the lower end of the first supporting body is hinged with the first connecting seat, a first groove is formed in the first connecting seat, and the first gear is fixedly arranged in the first groove. Through set up first recess on first connecting seat, reduced the installation degree of difficulty of first gear and promoted the stability behind the installation of first gear, realized the hidden installation of first gear simultaneously, avoided exposing of first gear, promoted the regularity of seat outward appearance.

Preferably, the transmission seat is provided with a first shaft hole and a second shaft hole at intervals, a first rotating shaft is arranged in the first shaft hole, a second rotating shaft is arranged in the second shaft hole, and the transmission seat is hinged with the tail end of the seat plate through the second rotating shaft; the novel bearing support is characterized in that arc-shaped sliding grooves are symmetrically formed in the left side wall and the right side wall of the first connecting seat, the arc-shaped sliding grooves penetrate through the side wall of the first connecting seat, two shaft seat plates with opposite intervals extend downwards from the lower end of the first supporting body, the first connecting seat is located between the two shaft seat plates, the shaft seat plates are connected with the first connecting seat in a rotating mode through supporting shafts, the first rotating shaft penetrates through the arc-shaped sliding grooves and then is inserted into preset insertion holes in a shaft seat plate of the first supporting body, and when the seat plate drives the transmission seat to move, the transmission seat pulls the shaft seat plate through the first rotating shaft, so that the shaft seat plate and the first supporting body rotate around the supporting shafts. It can be understood that the arc chute is arc-shaped, and the arc center of the arc chute coincides with the center of the first gear, and the arc chute limits the rotation direction and the rotation range of the first support body.

Preferably, the upper end of the first support body is provided with a second connecting seat, the second connecting seat comprises a second groove, and the second gear is rotationally connected in the second groove. Through set up the second recess on the second connecting seat, reduced the installation degree of difficulty of second gear and promoted the stability behind the second gear installation, realized the hidden installation of second gear simultaneously, avoided exposing of second gear, promoted the regularity of seat outward appearance.

Preferably, a notch is arranged at the lower end of the front side of the first shell, and the notch is matched with the transmission seat. Through setting up the breach, realize letting out the rotation space for first supporter.

Preferably, the first gear, the second gear and the transmission gear are all incomplete gears, the gear teeth of the first gear are arranged upwards, and the gear teeth of the second gear are arranged downwards. In actual operation, the first support body does not do circular motion, so that the first gear, the second gear and the transmission gear can meet the requirements by adopting incomplete gears, wherein the gear teeth of the first gear and the second gear are fan-shaped, the transmission gear is strip-shaped, and the transmission gear is strip-shaped by being arranged, so that the transmission gear is conveniently arranged in the first cavity.

Preferably, the middle part of the transmission gear is provided with a mounting hole, a third rotating shaft matched with the mounting hole is arranged in the first shell along the left-right direction, shaft cushion blocks are respectively arranged on two sides of the third rotating shaft, the shaft cushion blocks are integrally formed on two sides of the inner part of the first shell, after two ends of the third rotating shaft are pressed into a preset groove on the shaft cushion blocks, the third rotating shaft is prevented from being separated from the shaft cushion blocks by locking a sealing cover on the shaft cushion blocks, and the transmission gear is positioned between the two shaft cushion blocks.

Preferably, a connecting rod bracket is arranged between the supporting seat and the seat plate, the connecting rod bracket comprises two parallel and obliquely arranged supporting frames, the two supporting frames are arranged at intervals along the front-back direction, the lower end of the supporting frame is hinged with the chassis supporting seat, and the upper end of the supporting frame is hinged with the bottom surface of the seat plate; the supporting seat, the two supporting frames and the seat plate form a four-bar mechanism.

Preferably, a gas spring is further arranged in the supporting seat, one end of the gas spring is hinged with the supporting seat, the other end of the gas spring is hinged with the seat plate or the supporting frame, when the gas spring is in an open state, the seat plate is pressed down under the action of external force to enable the gas spring to be in linkage with the backrest mechanism, and the gas spring contracts and generates damping elastic force; when the external force disappears, the seat board rises and resets under the damping elastic force of the gas spring; when the gas spring is in a closed state, the seat plate and the backrest mechanism are locked and stay in the current state. When in actual work, the gas spring drives the connecting rod bracket to rotate, and the connecting rod bracket drives the seat board to lift. In this embodiment, the bottom surface of bedplate is enclosed and is equipped with the hem, is equipped with the cavity on the chassis, and the hem lock is in the cavity, bedplate, hem and cavity formation accommodation space, and the connecting rod support is located the accommodation space, and it is to be noted that, the lifting height of bedplate is not greater than the height of hem to guarantee connecting rod support and gas spring can not expose, promoted connecting rod support life and seat outward appearance uniformity, avoided the danger that the connecting rod support probably caused at the during operation. In addition, the gas spring is controlled to be unlocked and locked through the handle, so that a user can conveniently sit on the seat to control the gas spring.

Preferably, the second support body includes a second housing having a second cavity, and the backrest includes a support rod, and a portion of the support rod is located in the second cavity.

The principle and beneficial effects of the utility model adopting the technical scheme are as follows:

1. this seat is through setting up drive gear at first bracing piece, set up first gear at the rear end of bedplate, set up the second gear and set up the linkage subassembly at the lower extreme of second supporter, realize the seat back linkage of seat, realize backing along with the parallel antedisplacement of bedplate/back shift promptly, compare a plurality of connecting rod structures that current seat back linkage seat adopted, the gear installation is comparatively convenient, has promoted the packaging efficiency of seat by a wide margin, in addition, the transmission precision of gear is high, the operation stability of guarantee back is good.

2. Through setting up first connecting seat and second connecting seat, avoided exposing of first gear and second gear, promoted the life and the regularity of seat outward appearance of gear.

Drawings

FIG. 1 is a schematic view of a seat;

FIG. 2 is a cross-sectional view of a seat;

FIG. 3 is an internal schematic view of the seat pan mechanism and the back mechanism;

FIG. 4 is a schematic view of a seat pan mechanism, a back rest mechanism, and an air bar;

FIG. 5 is a schematic view of a seat pan mechanism and a back rest mechanism;

FIG. 6 is an exploded schematic view of the seat pan mechanism and the back mechanism;

fig. 7 is a cross-sectional view of the first support and the second support.

FIG. 8 is a front view of the interior of the first support;

FIG. 9 is a schematic view of a chassis assembly;

FIG. 10 is a schematic view of a connecting rod bracket and gas spring;

FIG. 11 is a schematic view of a seat pan;

FIG. 12 is a schematic view of the first housing;

FIG. 13 is a schematic view of a transmission mount;

FIG. 14 is a schematic view of a spacer block;

FIG. 15 is a schematic view of a change in the backrest state;

FIG. 16 is a schematic view of an end cap and baffle mechanism;

FIG. 17 is a schematic view of an alternative angle of the end cap and baffle mechanism;

fig. 18 is a schematic, split view of an end cap and baffle mechanism.

The reference numerals in the drawings are as follows:

1. a seat plate mechanism; 2. a seat plate; 3. a support base; 4. a backrest mechanism; 5. a first support body; 6. a second support body; 7. a backrest; 8. a first housing; 9. a first cavity; 10. a first gear; 11. a second gear; 12. a transmission seat; 13. a first connection base; 14. a first groove; 15. a second connecting seat; 16. a second groove; 17. a first shaft hole; 18. a second shaft hole; 19. an arc chute; 20. a notch; 21. a transmission gear; 22. a shaft cushion block; 23. a connecting rod bracket; 24. a support frame; 25. a gas spring; 26. a second cavity; 27. a second housing; 28. folding edges; 29. a cavity; 30. a shaft seat plate; 31. a support rod; 32. a mounting hole; 33. a baffle; 34. a handle; 35. an air bar; 36. a connecting block; 37. a chute; 38. a slide block; 39. an end cap; 40. hanging shaft; 41. a third shaft hole; 42. and a jack.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

The specific embodiments of the present utility model are as follows: as shown in fig. 1 to 18, the present utility model provides a seat comprising:

the seat board mechanism 1 comprises a seat board 2 and a chassis assembly, wherein the chassis assembly comprises a supporting seat 3 for inserting an air rod 35, and the seat board 2 is connected above the supporting seat 3 and can move up and down relative to the supporting seat 3;

the back rest mechanism 4 comprises a first support body 5, a second support body 6 and a back rest 7, wherein the lower end of the first support body 5 is hinged with the rear end of the support seat 3, the upper end of the first support body 5 is hinged with the lower end of the second support body 6, the back rest 7 is vertically connected to the second support body 6, the first support body 5 comprises a first shell 8 with a first cavity 9, a transmission gear 21 is rotationally arranged in the first shell 8, the second support body 6 comprises a second shell 27 with a second cavity 26, the back rest 7 comprises a support rod 31, and part of the support rod 31 is positioned in the second cavity 26;

the first gear 10 is fixedly arranged at the rear end of the supporting seat 3, and the transmission gear 21 is meshed with the first gear 10;

the second gear 11 is fixedly arranged at the lower end of the second support body 6, the transmission gear 21 is meshed with the second gear 11, and the transmission ratio of the first gear 10 to the transmission gear 21 is the same as that of the second gear 11 to the transmission gear 21;

the linkage assembly comprises a transmission seat 12, one end of the transmission seat 12 is hinged to the seat board 2, the other end of the transmission seat 12 is rotationally connected with the first support body 5, the transmission seat 12 is driven to rotate when the seat board 2 is lifted, the transmission seat 12 drives the first support body 5 to rotate, and when the first support body 5 rotates, the transmission gear 21 drives the second gear 11 to rotate, so that the second support body 6 is driven to rotate, the rotation direction of the second support body 6 is opposite to the rotation direction of the first support body 5, and the backrest 7 keeps translating in the horizontal direction.

In this scheme, when the human body sits on the seat, can make the bedplate 2 descend, then the bedplate 2 drives the transmission seat 12 and rotates down and remove, then the transmission seat 12 drives first supporter 5 and rotates down, the transmission gear 21 that is located inside first supporter 5 at this moment anticlockwise rotates, the second supporter 6 descends and forward horizontal migration, it can be understood that transmission gear 21 keeps meshing and synchronous reverse rotation with first gear 10, second gear 11 when rotating, because the transmission ratio of first gear 10 and transmission gear 21 is the same with the transmission ratio of second gear 11 and transmission gear 21 for the angle of second supporter 6 keeps unchanged, guarantee back 7 is in vertical state constantly. It will be appreciated that when the driving mechanism drives the seat plate 2 to rise, the above components operate reversely so that the second supporting body 6 rises and moves horizontally backward, which will not be described herein. The first gear 10, the second gear 11 and the transmission gear 21 are all incomplete gears, the teeth of the first gear 10 are arranged upwards, and the teeth of the second gear 11 are arranged downwards. In actual operation, as the first support body 5 does not do circular motion, the first gear 10, the second gear 11 and the transmission gear 21 can meet the requirements by adopting incomplete gears, wherein the gear teeth of the first gear 10 and the second gear 11 are fan-shaped, the transmission gear 21 is strip-shaped, and the transmission gear 21 is arranged to be strip-shaped, so that the transmission gear is conveniently arranged in the first cavity 9. Further, as shown in fig. 13, the states of the first support body 5 in rotation include a forward tilting state and a backward tilting state, when the first support body 5 is in the forward tilting state, the teeth on the first gear 10 forward are meshed with the teeth on the lower end of the transmission gear 21 forward, and the teeth on the second gear 11 rearward are meshed with the teeth on the upper end of the transmission gear 21 rearward; when the first support body 5 is in the backward tilting state, the rear teeth on the first gear 10 mesh with the rear teeth on the lower end of the transmission gear 21, and the front teeth on the second gear 11 mesh with the front teeth on the upper end of the transmission gear 21. The length of the transmission gear 21 determines the transmission ratio with the first gear 10 and the second gear 11; specifically, the length of the transmission gear 21 is proportional to the transmission ratio of the first gear 10 to the second gear 11. In this embodiment, the front and rear direction refer to the front and rear direction of the seat in the depth direction of the seat, and the up and down direction refer to the up and down direction along the height direction of the seat.

As shown in fig. 6 and 9, a first connecting seat 13 is fixedly arranged at the rear end of the supporting seat 3, the lower end of the first supporting body 5 is hinged with the first connecting seat 13, a first groove 14 is formed in the first connecting seat 13, a first gear 10 is fixedly arranged in the first groove 14, a second connecting seat 15 is arranged at the upper end of the first supporting body 5, the second connecting seat 15 comprises a second groove 16, and the second gear 11 is rotatably connected in the second groove 16. Through set up first recess 14 on first connecting seat 13, reduced the installation degree of difficulty of first gear 10 and promoted the stability after the installation of first gear 10, realized simultaneously the hidden installation of first gear 10, avoided exposing of first gear 10, through set up second recess 16 on second connecting seat 15, reduced the installation degree of difficulty of second gear 11 and promoted the stability after the installation of second gear 11, realized the hidden installation of second gear 11 simultaneously, avoided exposing of second gear 11, promoted the regularity of seat outward appearance.

As shown in fig. 13, a first shaft hole 17 and a second shaft hole 18 are arranged on the transmission seat 12 at intervals, a first rotating shaft is arranged in the first shaft hole 17, a second rotating shaft is arranged in the second shaft hole 18, and the transmission seat 12 is hinged with the tail end of the seat plate 2 through the second rotating shaft; the left and right side walls of the first connecting seat 13 are symmetrically provided with arc-shaped sliding grooves 19, the arc-shaped sliding grooves 19 penetrate through the side walls of the first connecting seat 13, the lower end of the first supporting body 5 downwards extends to form two shaft seat plates 30 with opposite intervals, the first connecting seat 13 is arranged between the two shaft seat plates 30, a rotating shaft hole 43 is formed in the shaft seat plates 30, a supporting shaft is arranged in the rotating shaft hole 43, the shaft seat plates 30 are rotationally connected with the first connecting seat 13 through the supporting shaft, the first rotating shaft penetrates through the arc-shaped sliding grooves 19 and then is inserted into a jack 42 preset in the shaft seat plates 30 of the first supporting body 5, and when the seat plate 2 drives the transmission seat 12 to move, the transmission seat 12 pulls the shaft seat plate 30 through the first rotating shaft, so that the shaft seat plates 30 and the first supporting body 5 rotate around the supporting shaft. It can be appreciated that the arc chute 19 is arc-shaped, and the arc center of the arc chute 19 coincides with the center of the first gear 10, and the arc chute 19 limits the rotation direction and the rotation range of the first support body 5.

As shown in fig. 6, the front side of the first housing 8 is detachably provided with an end cover 39, and a gap 20 is formed between the end cover 39 and the transmission seat 12. The notch 20 is matched with the transmission seat 12, and through setting up the notch 20, the realization is for the first support body 5 gives up the rotation space, through setting up the end cover 39 and can dismantle the connection on first casing 8, is convenient for change and maintain the drive gear 21 in the first cavity 9. In this embodiment, the first housing 8 is provided with an anti-clamping mechanism, the anti-clamping mechanism includes a baffle 33, the baffle 33 is slidably disposed on the end cover 39 along the length direction of the notch 20, the baffle 33 corresponds to the notch 20, the width of the baffle 33 is not smaller than the width of the notch 20, the length of the baffle 33 is not smaller than the length of the notch 20, when the first support 5 rotates, the baffle 33 slides up/down along with the rotation of the first support 5, the lower edge of the baffle 33 abuts against the top surface of the transmission seat 12, the seat plate 2 of the seat is connected with the first support 5 through the transmission seat 12, the second support 6 is connected with the first support 5, the transmission seat 12 is driven to rotate forward/backward when the seat plate 2 is lifted, then the transmission seat 12 drives the first support 5 to rotate forward, it can be understood that when the transmission seat 12 rotates forward, the distance of the upper edge of the notch 20 relative to the transmission seat 12 is gradually reduced, at this time, the lower edge of the baffle 33 contacts with the transmission seat 12 and is pushed upward by the transmission seat 12, the baffle 33 slides up to retract into the first support 5, when the upper edge of the transmission seat 20 rotates forward, and the distance of the transmission seat 20 gradually increases when the upper edge of the transmission seat 20 moves out of the transmission seat 20 relative to the first support 5. In the above process, the lower edge of the baffle 33 is always abutted against the top surface of the transmission seat 12, so that the gap 20 is shielded at any time without manual adjustment of the position of the baffle 33, and the baffle 33 is arranged to prevent the first gear 10 and the transmission gear 21 from clamping clothes or hands of a person during operation. By setting the width of the baffle 33 not smaller than the width of the notch 20, the length of the baffle 33 is not smaller than the length of the notch 20, and the baffle 33 can completely shield the notch 20. Specifically, two connecting blocks 36 are symmetrically arranged on the inner side of the end cover 39 of the first support body 5 in a left-right symmetry manner, the connecting blocks 36 are arranged along the length direction of the notch 20, sliding grooves 37 are formed in the inner side walls of the connecting blocks 36 along the length direction of the connecting blocks, sliding blocks 38 are symmetrically arranged on the left side walls and the right side walls of the baffle 33, the sliding blocks 38 are located at the top ends of the side walls of the baffle 33, the sliding blocks 38 are in one-to-one correspondence with the sliding grooves 37, and the sliding blocks 38 slide in the corresponding sliding grooves 37. By providing two connection blocks 36, stability of the baffle 33 when sliding is improved. In this embodiment, the sliding block 38 is a cylindrical sliding block, and the bottom end of the sliding slot 37 has an arc-shaped slot that is mutually matched with the sliding block 38. When the slider 38 slides in the slide groove 37, the slider 38 can rotate in the slide groove 37. In addition, a clearance is provided between the slider 38 and the slide groove 37 in the thickness direction of the slider 38. Due to the movable clearance between the sliding block 38 and the sliding groove 37, the sliding block 38 is ensured to slide smoothly in the sliding groove 37. It should be noted that, the rotation range of the first support 5 is 45 degrees to 135 degrees, and the sliding block 38 can slide downward in the chute 37 under the driving of the gravity of the baffle 33 no matter the first support 5 is at any angle. In the scheme, the upper end of the chute 37 is communicated with the top surface of the connecting block 36, the lower end of the chute 37 is not communicated with the bottom surface of the connecting block 36, and the length of the chute 37 is not less than the length of the baffle 33. In actual installation, the sliding block 38 enters the sliding groove 37 through the top surface of the connecting block 36, and the installation is simple and convenient. By providing the length of the chute 37 not smaller than the length of the shutter 33, it is ensured that the shutter 33 can be completely retracted inside the first support body. The outer surface of the baffle 33 is adapted to the inner side of the end cap 39 of the first support body 5. The inner side wall of the end cover 39 of the first support body 5 has an inclination or radian, and the inclination or radian of the external standard surface of the baffle 33 is consistent with that of the first support body 5, so that the baffle 33 can slide along the first support body 5, and in addition, after the baffle 33 slides out of the first support body 5, the connection degree between the baffle 33 and the end cover 39 of the first support body 5 is guaranteed to be high. In the present embodiment, hanging shafts 40 are convexly provided on both sides of the lower end of the baffle 33, third shaft holes 41 are provided on the left and right inner side walls of the first groove, and both ends of the hanging shafts 40 are respectively rotatably provided in the third shaft holes 41. In actual operation, the lower end of the baffle 33 is rotatably disposed at the third shaft hole 41, and the lower end surface of the baffle 33 abuts against the top surface of the transmission seat 12 at any time.

As shown in fig. 3, 8 and 14, the middle part of the transmission gear 21 is provided with a mounting hole 32, a third rotating shaft matched with the mounting hole 32 is arranged in the first shell 8 along the left-right direction, two sides of the third rotating shaft are respectively provided with a shaft cushion block 22, the shaft cushion blocks 22 are integrally formed at two sides of the inner part of the first shell 8, two ends of the third rotating shaft are pressed into preset grooves on the shaft cushion blocks 22, and then a sealing cover is locked on the shaft cushion blocks 22 to prevent the third rotating shaft from separating from the shaft cushion blocks 22, so that the transmission gear 21 is positioned between the two shaft cushion blocks 22. By arranging the shaft cushion block 22, the transmission gear 21 is prevented from swinging along the left-right direction during rotation, and the stability of the seat back during linkage is further improved. In this embodiment, two shaft pads 22 are sleeved on the third rotating shaft and are respectively located at two sides of the transmission gear 21, it should be noted that the shaft pad 22 may also be disposed at one side of the third rotating shaft, and the function of the shaft pad 22 is only to fill up the gap between the left and right side walls of the transmission gear 21 and the inner side wall of the first cavity 9, so that the installation position and the size of the shaft pad 22 are not limited, and are adjusted according to the actual production requirement.

As shown in fig. 10, a connecting rod bracket 23 is arranged between the supporting seat 3 and the seat board 2, the connecting rod bracket 23 comprises two parallel and obliquely arranged supporting frames 24, the two supporting frames 24 are arranged at intervals along the front-back direction, the lower end of the supporting frame 24 is hinged with the supporting seat 3, and the upper end of the supporting frame 24 is hinged with the bottom surface of the seat board 2; the support seat 3, the two support frames 24 and the seat board 2 form a four-bar mechanism, a gas spring 25 is further arranged in the support seat 3, one end of the gas spring 25 is hinged with the support seat 3, the other end of the gas spring 25 is hinged with the seat board 2 or the support frames 24, when the gas spring 25 is in an open state, the seat board 2 is pressed down under the action of external force to enable the seat board 2 to be linked with the backrest mechanism 4, and the gas spring 25 contracts and generates damping elastic force; when the external force disappears, the seat board 2 rises and returns under the damping elastic force of the gas spring 25; when the gas spring 25 is in the closed state, the seat plate 2 and the backrest mechanism 4 are locked and stay in the current state. When the seat is actually operated, the gas spring 25 drives the connecting rod support 23 to rotate, the connecting rod support 23 drives the seat board 2 to lift, and as the four-bar mechanism is formed by the supporting seat 3, the two supporting frames 24 and the seat board 2, when the seat board 2 of the seat is linked with the backrest 7, the descending height of the seat board 2 is basically consistent with the descending height of the backrest 7, so that a user does not feel back rubbing, and the comfort level of the seat is improved. In this embodiment, the bottom surface of bedplate 2 encloses and is equipped with hem 28, is equipped with the cavity on the chassis, and hem 28 lock is in cavity 29, and bedplate 2, hem 28 and cavity 29 form the accommodation space, and link support 23 is located the accommodation space, and it should be noted that, the lift height of bedplate 2 is not greater than the height of hem 28 to guarantee link support 23 and gas spring 25 can not expose, promoted link support 23 life and seat outward appearance uniformity, avoided link support 23 at the possible danger that causes of during operation. In addition, the gas spring 25 is controlled to be unlocked and locked by the handle 34, so that a user can conveniently sit on the seat to control the gas spring 25.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (10)

1. A seat, comprising:

the seat board mechanism comprises a seat board and a chassis assembly, the chassis assembly comprises a supporting seat for inserting an air rod, the seat board is connected above the supporting seat, and the seat board can move up and down relative to the supporting seat;

the backrest mechanism comprises a first support body, a second support body and a backrest, wherein the lower end of the first support body is hinged with the rear end of the support seat, the upper end of the first support body is hinged with the lower end of the second support body, the backrest is vertically connected to the second support body, the first support body comprises a first shell with a first cavity, and a transmission gear is rotationally arranged in the first shell;

the first gear is fixedly arranged at the rear end of the supporting seat, and the transmission gear is meshed with the first gear;

the second gear is fixedly arranged at the lower end of the second support body, the transmission gear is meshed with the second gear, and the transmission ratio of the first gear to the transmission gear is the same as that of the second gear to the transmission gear;

the linkage assembly comprises a transmission seat, one end of the transmission seat is hinged to the seat plate, the other end of the transmission seat is rotationally connected with the first support body, the seat plate drives the transmission seat to rotate when being lifted, the transmission seat drives the first support body to rotate at the moment, and when the first support body rotates, the transmission gear drives the second gear to rotate, so that the second support body is driven to rotate, the rotation direction of the second support body is opposite to the rotation direction of the first support body, and the backrest keeps translating in the horizontal direction.

2. The seat according to claim 1, wherein a first connecting seat is fixedly arranged at the rear end of the supporting seat, the lower end of the first supporting body is hinged to the first connecting seat, a first groove is formed in the first connecting seat, and the first gear is fixedly arranged in the first groove.

3. The seat according to claim 2, wherein the transmission seat is provided with a first shaft hole and a second shaft hole at intervals, a first rotating shaft is arranged in the first shaft hole, a second rotating shaft is arranged in the second shaft hole, and the transmission seat is hinged with the tail end of the seat plate through the second rotating shaft; the novel bearing support is characterized in that arc-shaped sliding grooves are symmetrically formed in the left side wall and the right side wall of the first connecting seat, the arc-shaped sliding grooves penetrate through the side wall of the first connecting seat, two shaft seat plates with opposite intervals extend downwards from the lower end of the first supporting body, the first connecting seat is located between the two shaft seat plates, the shaft seat plates are connected with the first connecting seat in a rotating mode through supporting shafts, the first rotating shaft penetrates through the arc-shaped sliding grooves and then is inserted into preset insertion holes in a shaft seat plate of the first supporting body, and when the seat plate drives the transmission seat to move, the transmission seat pulls the shaft seat plate through the first rotating shaft, so that the shaft seat plate and the first supporting body rotate around the supporting shafts.

4. The seat according to claim 1, wherein a second connecting seat is provided at an upper end of the first support body, the second connecting seat includes a second groove, and the second gear is rotatably connected in the second groove.

5. A seat as claimed in claim 1, wherein the lower end of the front side of the first housing is provided with a notch, said notch being adapted to the transmission seat.

6. The seat of claim 1, wherein the first gear, the second gear, and the drive gear are incomplete gears, the teeth of the first gear are disposed upwardly, and the teeth of the second gear are disposed downwardly.

7. The seat according to claim 1, wherein the middle part of the transmission gear is provided with a mounting hole, a third rotating shaft matched with the mounting hole is arranged in the first shell along the left-right direction, two sides of the third rotating shaft are respectively provided with a shaft cushion block, the shaft cushion blocks are integrally formed at two sides of the first shell, two ends of the third rotating shaft are pressed into grooves preset on the shaft cushion blocks, and then a sealing cover is locked on the shaft cushion blocks to prevent the third rotating shaft from being separated from the shaft cushion blocks, so that the transmission gear is positioned between the two shaft cushion blocks.

8. The seat according to claim 1, wherein a connecting rod bracket is arranged between the supporting seat and the seat plate, the connecting rod bracket comprises two parallel and obliquely arranged supporting frames, the two supporting frames are arranged at intervals along the front-rear direction, the lower end of the supporting frame is hinged with the chassis supporting seat, and the upper end of the supporting frame is hinged with the bottom surface of the seat plate; the supporting seat, the two supporting frames and the seat plate form a four-bar mechanism.

9. The seat according to claim 8, wherein a gas spring is further arranged in the supporting seat, one end of the gas spring is hinged to the supporting seat, the other end of the gas spring is hinged to the seat plate or the supporting frame, when the gas spring is in an open state, the seat plate is pressed down under the action of external force to enable the seat plate to be linked with the backrest mechanism, and the gas spring contracts and generates damping elastic force; when the external force disappears, the seat board rises and resets under the damping elastic force of the gas spring; when the gas spring is in a closed state, the seat plate and the backrest mechanism are locked and stay in the current state.

10. A seat as set forth in claim 1 wherein said second support body includes a second housing having a second cavity and said backrest includes a support rod, a portion of said support rod being located within said second cavity.