CN219877770U - Chair seat - Google Patents

Abstract

The utility model discloses a seat, which comprises a back frame, a seat frame and a seat support frame; the front end of the seat support frame is movably connected with the front end of the seat frame; the two sides of the back frame are respectively provided with a back support arm, and the seat support frame is provided with a lower support arm; a transmission swinging assembly is arranged between the back support arm and the lower support arm, and the transmission swinging assembly comprises swinging arms with two ends respectively engaged with the back support arm and the lower support arm; the swing arm is provided with an upper moving tooth and a lower moving tooth; the front end of the back support arm is correspondingly provided with a back guide tooth which is in tooth connection with the upper movable tooth, and the upper end of the lower support arm is correspondingly provided with a lower guide tooth which is in tooth connection with the lower movable tooth; when the back frame moves from the initial sitting position to the backward rotation position, the back guide teeth and the upper moving teeth are transmitted to enable the upper end of the swing arm to move forwards, and the lower moving teeth and the lower guide teeth at the lower end of the swing arm are transmitted to enable the swing arm to rotate forwards along the lower guide teeth; the rear end of the seat frame is also provided with a seat linkage piece extending upwards, and the seat linkage piece is connected to the transmission swinging assembly; the swing arm rotates forward to drive the seat frame to move forward simultaneously.

Description

Chair seat

Technical Field

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

Background

The seat is used as a living tool which is indispensable for the living and working environment, so that the seat has higher and higher comfort requirements for the living and working environment, and the comfort and operability of the seat are obviously improved on the premise of working efficiency. The chair back and the chair seat of the traditional chair are usually fixed, and then an office chair with a chassis for lifting the chair seat gradually appears, but the design of the traditional chair on the structure of the traditional chassis limits the corresponding displacement of the chair seat when the chair back of a user leans backwards; i.e. the movement between the back and the seat is independent of each other. The back of the chair can be changed with the front-back distance of the chair seat when the back of the chair is reclined, and the back of the chair can be displaced and rubbed with the back of a user relatively under the condition of unchanged position of the chair seat, so that discomfort is caused, and the problem of back rubbing and waist running of people appears.

In view of the above problems, manufacturers have proposed seats with seat backs capable of ergonomic linkage, such seats being collectively referred to as seats; and when most of chairs are used, the linkage between the chair back and the chair seat is realized through a chassis structure below the chair seat.

The Chinese patent publication No. CN202220338236.6 discloses an office chair with back recline and seat sliding linkage, comprising: the bearing structure comprises an assembly frame, a fixed sliding sleeve is arranged on the assembly frame, and the fixed sliding sleeve is provided with a guide hole which extends obliquely relative to the horizontal plane; the chair seat comprises a movable seat, a sliding pin is arranged on the movable seat, and the sliding pin is arranged in the guide hole in a sliding manner along the extending direction of the guide hole; the backrest comprises a main body frame and a hinge lug arranged on the main body frame, the main body frame is rotatably arranged on the assembly frame along the bottom of the main body frame in the height direction in a resetting manner, and the hinge lug is rotatably arranged on the movable seat; and the locking pin assembly is arranged on the assembly frame and used for locking the position of the sliding pin in the guide hole. The utility model can realize mutual linkage of the backward tilting of the backrest and the sliding of the seat, and can lock the lying posture which best meets the comfort requirement required by users, thereby greatly improving the use comfort of the office chair.

Such means of seat back linkage through the chassis structure are very common in the current office chair structure; however, the cooperation between the corresponding chassis and the structure are certainly complex and complicated; the biggest problem is that the chassis is expensive to manufacture and manufacture. The cost of a set of chassis mould and manufacturing chassis is very expensive; indirectly resulting in a higher selling price for the seat. Therefore, there is a need to design a seat with a reduced structure and a lower cost seat back linkage.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a seat; the back support arm, the swing arm and the lower support arm are matched through gear transmission by the transmission swing assemblies arranged on the two sides of the seat; the back frame can synchronously move forward while leaning backward, so that the linkage between the back and the seat is realized; therefore, a chassis structure of a traditional seat is not required to be equipped, the structure is simple and reliable, and the design is ingenious; the cost of the seat can be greatly reduced.

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

a seat comprises a back frame, a seat frame and a seat support frame; the seat support frame comprises a base and a guide bracket extending forwards from the base, and the guide bracket is configured to be movably connected with the front end of the seat frame; the two sides of the back frame are respectively provided with a back support arm extending forwards, and the two sides of the guide bracket are respectively provided with a lower support arm extending upwards; a transmission swinging assembly is arranged between the back support arm and the lower support arm, and the transmission swinging assembly comprises swinging arms with two ends respectively engaged with the back support arm and the lower support arm; the upper end of the swing arm is provided with an upper moving tooth, and the lower end of the swing arm is provided with a lower moving tooth; the front end of the back support arm is correspondingly provided with a back guide tooth which is in tooth connection with the upper moving tooth, and the upper end of the lower support arm is correspondingly provided with a lower guide tooth which is in tooth connection with the lower moving tooth; when the back frame moves from the initial sitting position to the backward rotation position, the back support arm moves backward, the upper end of the swing arm moves forward through transmission between the back guide teeth and the upper moving teeth, and the lower moving teeth at the lower end of the swing arm simultaneously transmit with the lower guide teeth gears, so that the swing arm rotates forward along the lower guide teeth; the rear end of the seat frame is also provided with a seat linkage piece extending upwards, and the seat linkage piece is connected to the transmission swinging assembly; the swing arm rotates forward to drive the seat frame to move forward simultaneously.

Preferably, the swing arm is of an integrated structure, the upper moving teeth are formed at the upper end of the swing arm, and the lower moving teeth are formed at the lower end of the swing arm. The swing arm is a single component, and the upper moving teeth and the lower moving teeth are formed by directly processing the swing arm; so that the whole structure is sufficiently simplified.

Preferably, the back support arm is of an integrated structure, and the back guide teeth are formed at the end part of the back support arm; the lower support arm is of an integrated structure, and the lower guide teeth are formed at the end part of the lower support arm. The back guide teeth are also directly formed on the back support arm, and the lower guide teeth are also directly formed on the lower support arm; the gear structure is not required to be additionally arranged, and the parts of the product are reduced; the integral main body matching structure can be realized by only needing three parts of a back support arm, a swinging arm and a lower support arm.

Preferably, the contour path of the back guide teeth is arc-shaped; the contour path of the lower guide tooth is arc-shaped. The back guide teeth can be matched with the back frame to rotate backwards so as to drive the upper moving teeth; the lower guide teeth can be driven by the lower moving teeth to enable the swing arm to rotate forwards.

Preferably, the transmission swinging assembly further comprises an inner side support plate and an outer side support plate which are arranged on the inner side and the outer side of the swinging arm, and the inner side support plate is overlapped with the outer side support plate left and right; the inner support plate, the outer support plate and the center position of the swing arm are rotationally connected to the same rotation point; the upper end of the inner support plate and the upper end of the outer support plate are rotationally connected with the back support arm at the same rotation point; the lower end of the outer support plate is rotationally connected with the lower support arm; the seat linkage is rotatably connected to one of the inner support plate or the outer support plate. The connecting strength can be further improved, and the swinging arm is hidden, so that the structure is attractive.

Preferably, a lower rotation limiting mechanism is arranged between the outer support plate and the lower support arm, and comprises an arc-shaped lower limiting groove arranged on one of the outer support plate and the lower support arm and a lower limiting pin correspondingly arranged on the other of the outer support plate and the lower support arm and penetrating through the lower limiting groove. Thereby being capable of limiting the back frame to rotate within a certain angle range.

Preferably, the lower limit grooves are provided on the outer side support plate, and the lower limit grooves are arranged at least two circumferentially spaced apart. In the utility model, the upper rotation limiting mechanism and the lower rotation limiting mechanism are used for limiting in the initial sitting position and the backward rotation position, so that a plurality of limiting structures are required to be arranged for increasing the structural stability, the back frame 1 can stably stay in two positions, and the seat is safer to use.

Preferably, an upper rotation limiting mechanism is arranged between one of the inner support plate or the outer support plate and the back support arm; the upper rotation limiting mechanism comprises an arc-shaped upper limiting groove and an upper limiting pin penetrating through the upper limiting groove. And then under the effect of upper rotation stop gear and lower rotation stop gear for the seat structure operation is firm.

Preferably, in the initial sitting position, the swing arm is inclined forward and downward from back to front. Then under the action of the gravity of the swing arm and the action of the limiting mechanism, the back frame can be stably kept at the initial sitting position.

Preferably, the outer support plate is configured to be connected to an armrest. The transmission support piece is positioned at the side part of the seat and can be further connected with the support handrail; and the armrests can synchronously move with the seat backs, so that the design is more ingenious.

Preferably, the seat linkage member extends forward and upward from the side portion of the seat frame, and the seat connection member is rotatably connected to the upper portion of the inner support plate. The force application direction of the swinging component to the seat frame is matched with the length direction of the seat linkage piece when the swinging component rotates forwards, so that the force transmission effect is better, and the seat frame is pulled to move more effectively.

Preferably, the guide bracket extends forwards and upwards, and a balance guide mechanism is arranged between the front end of the guide bracket and the seat frame; the balance guide mechanism comprises two upper and lower spaced rolling transverse shafts arranged at the front end of the guide bracket and a balance guide plate arranged at the front end of the seat frame and extending backwards; the balance guide plate is clamped between the two rolling transverse shafts and is arranged tangentially to any one of the rolling transverse shafts; the rolling transverse shaft can roll in place relative to the guide bracket. Therefore, when the seat frame moves forwards and backwards, the balance guide plate can stably move forwards and backwards between the two rolling transverse shafts, so that the seat frame moves stably and cannot shake; and the balance guide plate is clamped between the two rolling transverse shafts and can change the angle.

Preferably, in the initial sitting position, the seat frame is in a front high and rear low state; the balance guide plate is inclined towards the rear lower side from front to back; and the included angle between the balance guide plate and the seat frame is an acute angle. When the back support body rotates backwards, the transmission support piece simultaneously acts on the rear end of the seat support piece to lift upwards and move forwards, and the rear end of the balance guide plate can lift upwards and move forwards simultaneously; the balance guide plate can change the angle between the two rolling transverse shafts so that the front end of the balance guide plate can move downwards, and the front end of the seat frame can sink for a certain distance to offset the distance of the seat frame moving upwards in the process; so that the front end of the final seat frame moves forward, but the height thereof remains almost unchanged, without pressing the thighs of the user.

Preferably, in the initial position, a connecting line between the axes of the two rolling transverse shafts is perpendicular to the length direction of the balance guide plate. The balance guide plate is easier to rotate between the two rolling transverse shafts at the initial position; so that the balance guide plate rotates smoothly.

Preferably, the guide bracket includes a support plate extending upward and forward from the base, the support plate being a steel plate. The support of the structure can be ensured.

Preferably, side support plates are respectively arranged on two sides of the guide support, and the lower support arm is arranged on the side support plates.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

firstly, the chair of the utility model realizes the linkage effect between the back frame and the seat frame by utilizing the transmission swinging assembly; the back support arm, the swing arm and the lower support arm are matched in a gear transmission way; when the back frame is rotated backwards, the seat frame can be driven to move forwards and upwards at the same time; realizing seat back linkage. The transmission swinging assemblies are arranged on two sides of the seat, so that the linkage between the seat backs can be realized without a chassis structure of the traditional seat; the swing arm, the back support arm and the lower support arm are three single parts, and the gear structure is directly processed and formed on the three bodies; the gear structure is not needed to be additionally connected and arranged, so that the parts of the product are reduced; the whole basic matching structure is composed of three parts of a back support arm, a swing arm and a lower support arm, the structure is simple and reliable, and the cost can be greatly reduced.

In addition, due to the fact that the structure is simplified, the number of parts is reduced, transmission errors are reduced, the swinging arms on two sides of the seat are high in rotation synchronism, the back frame and the two sides of the seat frame keep synchronous movement, and the tilting movement of the seat is very stable.

Furthermore, the front end of the seat frame and the front end of the guide bracket are further provided with a balance guide mechanism, and the balance guide mechanism comprises two rolling transverse shafts which are arranged at the front end of the bracket and are vertically spaced, and a balance guide plate which is arranged at the front end of the seat frame and extends backwards and downwards; the balance guide plate is clamped between the two rolling transverse shafts and can change the angle; when the rear end of the seat support is lifted upwards and moves forwards, the rear end of the balance guide plate is lifted upwards and moves forwards at the same time; the front end of the balance guide plate moves downwards so that the front end of the seat frame sinks for a certain distance to offset the distance of upward movement of the seat frame in the moving process; so that the front end of the final seat frame moves forward, but the front end height thereof remains almost unchanged; the front end of the seat frame can not be propped up to press thighs of a user in the backward tilting process.

Drawings

FIG. 1 is a side view of a seat in an initial sitting position of a back frame in accordance with an embodiment of the present utility model;

FIG. 2 is a side view of the back frame in an initial seated position with the lower back arm, swing arm, and lower arm engaged in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic perspective view illustrating a back frame and a seat frame according to an embodiment of the present utility model;

FIG. 4 is a schematic perspective view of the back frame and the seat frame at another angle according to the embodiment of the utility model;

FIG. 5 is a diagram showing the configuration of the back arm, swing arm and lower arm cooperating in an embodiment of the present utility model;

FIG. 6 is a diagram showing the structure of the back arm, swing arm and lower arm after they are moved in an embodiment of the present utility model;

FIG. 7 is a schematic perspective view of a guide bracket and seat frame connection in an embodiment of the present utility model;

FIG. 8 is a schematic perspective view of a seat frame and a back frame in an initial sitting position according to an embodiment of the present utility model;

FIG. 9 is a schematic perspective view of a seat frame and a back frame in a reclined rotated position according to an embodiment of the present utility model;

fig. 10 is a comparative view of the forward movement of the seat frame in the embodiment of the present utility model.

The reference numerals are as follows: a back frame 1; a back support arm 101; a seat frame 2; a seat linkage 201; a seat support frame 3; a base 3a; a guide bracket 3b; a transmission swing assembly 4; a lower arm 5; swing arm 6; an upper movable tooth 601; lower movable teeth 602; back guide teeth 7; lower guide teeth 8; an inner support plate 9; an outer support plate 10; an upper limit groove 11; an upper stopper pin 12; a lower limit groove 13; a lower stopper pin 14; rolling the horizontal axis 15; a balance guide 16; a support plate 17; a side branch plate 18.

Description of the embodiments

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.

In the description of the present utility model, the term "at least one" refers to one or more, unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiments of the present utility model are as follows:

as shown in fig. 1 to 2, the present utility model provides a seat comprising a back frame 1, a seat frame 2, and a seat support frame 3 disposed below the seat frame 2; the seat support frame 3 comprises a base 3a and a guide bracket 3b extending forwards from the base 3a, wherein the front end of the seat frame 2 is movably connected with the guide bracket 3b, so that the seat frame 2 can move forwards and backwards along the guide bracket 3 b. The two sides of the back frame 1 are respectively provided with a back support arm 101 extending forwards, two sides of the guide support 3b are respectively provided with a lower support arm 5 extending upwards, and a transmission swinging assembly 4 is arranged between the back support arm 101 and the lower support arm 5. A seat linkage piece 201 extending forwards and upwards is arranged at the rear part of the seat frame 2, and the seat linkage piece 201 is connected to the transmission swinging assembly 4; when the back frame 1 is rotated backwards, the back frame 1 and the seat frame 2 can be linked under the action of the transmission swinging assembly 4.

Specifically: as shown in fig. 2-9, the driving swing assembly 4 comprises a swing arm 6 arranged between a back support arm 101 and a lower support arm 5, and the swing arm 6 is inclined towards the front and the lower side when the back frame 1 is in the initial sitting position from back to front; and two ends of the swing arm 6 are respectively matched with the back support arm 101 and the lower support arm 5 in a toothed manner; wherein, the upper end of the swing arm 6 is provided with an upper moving tooth 601, and the lower end of the swing arm 6 is provided with a lower moving tooth 602; the front end of the back support arm 101 is correspondingly provided with a back guide tooth 7 which is in tooth connection with the upper moving tooth 601, and the contour path of the back guide tooth 7 is arc-shaped; the upper end of the lower support arm 5 is correspondingly provided with a lower guide tooth 8 which is in tooth joint with the lower moving tooth 602, and the contour path of the lower guide tooth 8 is also arc-shaped.

Then, the two ends of the swing arm 6 are respectively in toothed transmission fit with the back support arm 101 and the lower support arm 5, so that the back support arm 101, the swing arm 6 and the lower support arm 5 form a linkage relation; the back guide teeth 7 can be matched with the back frame 1 to rotate backwards so as to drive the upper moving teeth 601; and the lower guide teeth 8 can be driven with the lower moving teeth 602 so that the swing arm 6 rotates forwards. The method specifically comprises the following steps: as shown in fig. 5 and 6, when the back frame 1 moves backward, the back support arm 101 moves in a backward track, and the gear transmission between the back guide teeth 7 and the upper moving teeth 601 drives the upper end of the swing arm 6 to move forward, so that the lower moving teeth 602 at the lower end of the swing arm 6 simultaneously drive the lower guide teeth 8 in a gear manner, and the lower support arm 5 is arranged on the guide bracket 3b, that is, the lower support arm 5 is fixed, and the lower support arm 5 can provide a supporting force for the swing arm 6, so that the swing arm 6 integrally rotates forward around the lower guide teeth 8.

And it should be noted that: in the utility model, the swing arm 6 is of an integrated structure, the upper moving teeth 601 are formed at the upper end of the swing arm 6, the lower moving teeth 602 are formed at the lower end of the swing arm 6, namely the swing arm 6 is a single component, and the upper moving teeth 601 and the lower moving teeth 602 are formed by directly processing on the swing arm 6; in addition, the back support arm 101 is also of an integrated structure, and the back guide teeth 7 are formed at the end part of the back support arm 101; the lower support arm 5 is of an integrated structure, and the lower guide teeth 9 are formed at the end part of the lower support arm; the back guide teeth 7 are also directly machined on the back support arm 101, and the lower guide teeth 9 are also directly machined on the lower support arm 5; that is, swing arm 6, back arm 101 and lower arm 5 are three single pieces; the gear structure is not needed to be additionally connected and arranged, so that the parts of the product are reduced; the whole basic matching structure is three parts of the back support arm 101, the swing arm 6 and the lower support arm 5, and the structure is quite simple.

As shown in fig. 1-4, the driving swing assembly 4 further comprises an inner support plate 9 and an outer support plate 10 which are arranged at the inner side and the outer side of the swing arm 6, wherein the inner support plate 9 and the outer support plate 10 are overlapped left and right; wherein, the inner support plate 9 and the outer support plate 10 are rotationally connected with the center position of the swinging arm 6 at the same rotation point; the upper end of the inner support plate 9 and the upper end of the outer support plate 10 are also rotatably connected with the back support arm 101 at the same rotation point; the lower end of the outer support plate 10 is also in rotary connection with the lower support arm 5; and the lower end of the inner support plate 9 is cut short to avoid interference between the inner support plate 9 and the guide bracket 3 b. Then can play the supporting role to rocking arm 6 through setting up inboard extension board 9 and outside extension board 10, and when rocking arm 6 forwards rotates, can drive inboard extension board 9 and outside extension board 10 forward rotation simultaneously, inboard extension board 9 and outside extension board 10 are followed rocking arm 6 simultaneous movement promptly. In addition, the inner support plate 9 and the outer support plate 10 can further improve the connection strength between the back support arm 101 and the lower support arm 5; and conceals the swing arm 6, resulting in an attractive structure. The seat linkage 201 is a plate-shaped member extending forward and upward from back to front, and the upper end of the seat linkage 201 is rotatably connected to the inner support plate 9; when the swing arm 6 rotates forwards and drives the inner support plate 9 to rotate forwards, the inner support plate 9 can effectively pull the seat linkage piece 201 forwards, so that the seat frame 2 is driven to move forwards; finally, the linkage between the back frame 1 and the seat frame 2 is realized.

Most of the current seats realize the effect of seat back linkage through a chassis structure, but the matching between the corresponding chassis and the structure are certainly complex and complicated; the biggest problem is that the chassis is expensive to manufacture and manufacture. The cost of a set of chassis mould and manufacturing chassis is very expensive; indirectly resulting in a higher selling price for the seat. Through the above, it can be seen that the utility model is beneficial to realize the linkage relationship between the back frame 1 and the seat frame 2 by arranging the back support arm 101, the lower support arm 5 and the swinging arm 6 on the side part of the seat and facilitating the gear transmission cooperation between the three; the structural design is ingenious, the matching relation among the components is also clear, and the assembly steps are simple.

In addition, an upper rotation limiting mechanism is arranged between the upper end of the inner support plate 9 and the back support arm 101, and comprises an arc-shaped upper limiting groove 11 arranged on the back support arm 101 and an upper limiting pin 12 correspondingly arranged on the inner support plate 9 and penetrating through the upper limiting groove 11; as shown in fig. 8-9, when the back frame 1 is reclined from the initial sitting position to the reclined rotation position, the upper limiting pin 12 moves correspondingly to the two ends in the upper limiting groove 11; therefore, the back frame 1 can be limited to rotate within a certain angle range, and the structural stability is improved. The upper rotation limiting mechanism is not limited to be disposed only between the upper end of the inner support plate 9 and the back support arm 101, and the upper rotation limiting mechanism may be disposed between the upper end of the outer support plate 9 and the back support arm 101. Similarly, a lower rotation limiting mechanism is further arranged between the lower end of the outer support plate 10 and the lower support arm 5, the lower rotation limiting mechanism comprises an arc-shaped lower limiting groove 13 arranged at the lower part of the outer support plate 10 and a lower limiting pin 14 correspondingly arranged on the lower support arm 5 and penetrating through the lower limiting groove 13, and the lower limiting pin 14 is matched with the lower limiting groove 13 to limit rotation of the swing arm 6.

And the lower limit groove 13 is configured as two upper and lower intervals arranged on the outer support plate 10; in the utility model, the upper rotation limiting mechanism and the lower rotation limiting mechanism are used for limiting in the initial sitting position and the backward rotation position, so that a plurality of limiting structures are required to be arranged for increasing the structural stability, the back frame 1 can stably stay in two positions, and the seat is safer to use. As shown in fig. 1-2, in the initial sitting position, the swing arm 6 is inclined forward and downward from back to front; then under the action of the gravity of the swing arm 6 and the action of the limiting mechanism, the back frame 1 can be stably kept at the initial sitting position.

As shown in fig. 4-9, a balance guide mechanism is further arranged between the front end of the seat frame 2 and the front end of the guide bracket 3b, and the balance guide mechanism comprises two rolling transverse shafts 15 which are arranged at the front end of the guide bracket 3b at intervals up and down and a balance guide plate 16 which is arranged at the front end of the seat frame 2 and extends backwards and downwards; the balance guide plate 16 is clamped between the two rolling cross shafts 15, the balance guide plate 16 is tangential to any one rolling cross shaft 15, and the rolling cross shaft 15 can roll in situ relative to the guide bracket 3b; therefore, when the seat frame 2 moves forwards and backwards, the balance guide plate 16 can stably move forwards and backwards between the two rolling transverse shafts 15, so that the seat frame 2 moves stably and does not shake. The guide bracket 3b comprises a supporting plate 17 extending forwards and upwards from the base 3a, and the supporting plate 17 is made of steel plates, so that the structural supportability can be ensured; the two sides of the front end of the guide bracket 3b are also provided with side support plates 18 which are longitudinally arranged, and the lower support arm 5 is arranged on the side support plates 18.

The seat linkage 201 is disposed at the rear end of the seat frame 2, and then when the back frame 1 rotates backward, the transmission swinging assembly 4 rotates forward, mainly acts on the rear end of the seat frame 2 to move upward and forward, and applies upward and forward acting force to the rear end of the seat frame 2. Furthermore, the clamping of the balancing guide 16 between the two rolling transverse shafts 15 is angularly variable; as shown in fig. 10, in the initial position, and from front to back, the balance guide 16 is inclined downward and rearward; the connecting line between the axes of the two rolling transverse shafts 15 is vertical to the length direction of the balance guide plate 19; so that the balance guide 19 can more easily rotate between the two rolling transverse shafts 15. Then when the rear end of the seat frame 2 is lifted upwards and moves forwards, the rear end of the balance guide plate 16 is lifted upwards and moves forwards at the same time; so that the balance guide plate 16 correspondingly rotates between the two rolling transverse shafts 15, and the front end of the balance guide plate 16 moves downwards when the balance guide plate 16 rotates, so that the front end of the seat frame 2 sinks a certain distance to offset the upward movement distance of the seat frame 2 in the movement process; so that the front end of the final seat frame 2 moves forward, but the height thereof remains almost unchanged; even if lifted, the lifted part is negligible, and the user hardly experiences, so that the thigh phenomenon of the user who is propped up can not occur at the front end of the seat frame 2 in the backward tilting process, and the use is comfortable. And the included angle between the balance guide plate 16 and the seat frame 2 is an acute angle; the rotation of the balance guide plate 16 has little influence on the whole angle of the seat frame 2, and only plays a role in preventing the front end of the seat frame 2 from being lifted.

Then, the specific seat supporting method of the seat is as follows: as shown in fig. 1 and 8, in the initial position, the seat frame 2 is in a state of being high in front and low in rear; the back frame 1 approaches an upright state. The user sits on the seat and applies back thrust to the back frame 1 to drive the back frame 1 to rotate backwards, the back frame 1 drives the back support arm 101 to move backwards, gear transmission occurs between the back guide teeth 7 and the upper moving teeth 601, and the upper end of the swing arm 6 is driven to move forwards; the lower end of the swing arm 6 is correspondingly in gear transmission with the lower moving teeth 602, so that the swing arm 6 rotates forwards around the lower support arm 5; the inner support plate 9 and the outer support plate 10 simultaneously rotate forwards along with the swing arm 6, so that the seat linkage 201 is driven to move forwards to pull the seat frame 2 to move forwards. It follows that the drive rocking assembly 4 will simultaneously rotate forwardly relative to the seat support frame 3 while the back frame 1 rotates rearwardly relative to the seat support frame 3; the upper end of the seat linkage piece 201 is rotatably connected to the upper part of the transmission swinging assembly 4, and then when the transmission swinging assembly 4 rotates forwards, the seat linkage piece 201 is acted to drive the rear end of the seat frame 2 to move upwards and forwards to a backward rotation position; as shown in fig. 9, in the reclined rotation position, the seat frame 2 approaches to a horizontal state; the back support arm 101 always rotates downwards relative to the upper end of the transmission swinging assembly 4, so that the bottom end of the back frame 1 moves downwards and forwards, thereby effectively avoiding the phenomenon that the waist of a user loses support and the back of a user is rubbed against the back of the user.

In the initial position, the seat frame 2 is in a state of high front and low back, so that when the back of a user applies a backward tilting force to the back frame 1; the back tilting force is transmitted to the back end of the seat frame 2 through the transmission swinging component 4 to apply upward acting force, so that the acting force forms a countercheck relation with the gravity applied by a user to the back end of the seat frame 2 downwards, and the acting force and the gravity are in a direct proportion relation; so that people with lighter weight or heavier weight can easily lean and recover to get up; so that the seat has the gravity self-adaption function.

A handrail (not shown) may be attached to the transmission swing assembly 4, and the handrail is connected to the outer support plate 10; because the drive swing assembly 4 is located just to the side of the seat, mounting the armrests thereon is also easy to accomplish; therefore, the armrests can synchronously move with the seat backs, and the design is more ingenious; thus, the seat of the utility model is completely provided with no chassis structure of the traditional seat, and the cost can be greatly reduced.

Then, the chair of the utility model realizes the linkage effect between the back frame 1 and the seat frame 2 by utilizing the transmission swinging component 4; the transmission swinging assemblies 4 are arranged on two sides of the seat, so that linkage between seat backs can be realized without a chassis structure of a traditional seat, the structure is simple and reliable, and the cost can be greatly reduced. So that the seat frame 2 moves forward synchronously with the back frame 1 when the user leans backwards to rotate the back frame 1 backwards; the chair can always play the role of supporting the waist of the human body, effectively avoid the occurrence of the 'waist running' condition and be beneficial to the health of the human body; meanwhile, due to the design, the backrest moves synchronously, so that the backrest is always clung to the back of a human body to avoid displacement in the tilting process of a user, and the comfort is ensured; in addition, the back frame 1 is reclined through the linkage design, and meanwhile, the seat frame 2 moves forwards to convey a human body to move forwards, so that the problem of unstable backward gravity center caused by backward tilting is properly solved. And, while the seat frame 2 moves forward, the front end of the seat frame 2 is lifted up negligible, without causing stress on the thighs of the user.

Claims (14)

1. A seat, characterized in that: comprises a back frame, a seat frame and a seat support frame; the seat support frame comprises a base and a guide bracket extending forwards from the base, and the guide bracket is configured to be movably connected with the front end of the seat frame; the two sides of the back frame are respectively provided with a back support arm extending forwards, and the two sides of the guide bracket are respectively provided with a lower support arm extending upwards; a transmission swinging assembly is arranged between the back support arm and the lower support arm, and the transmission swinging assembly comprises swinging arms with two ends respectively engaged with the back support arm and the lower support arm; the upper end of the swing arm is provided with an upper moving tooth, and the lower end of the swing arm is provided with a lower moving tooth; the front end of the back support arm is correspondingly provided with a back guide tooth which is in tooth connection with the upper moving tooth, and the upper end of the lower support arm is correspondingly provided with a lower guide tooth which is in tooth connection with the lower moving tooth; when the back frame moves from the initial sitting position to the backward rotation position, the back support arm moves backward, the upper end of the swing arm moves forward through transmission between the back guide teeth and the upper moving teeth, and the lower moving teeth at the lower end of the swing arm simultaneously transmit with the lower guide teeth gears, so that the swing arm rotates forward along the lower guide teeth; the rear end of the seat frame is also provided with a seat linkage piece extending upwards, and the seat linkage piece is connected to the transmission swinging assembly; the swing arm rotates forward to drive the seat frame to move forward simultaneously.

2. The seat according to claim 1, wherein: the swing arm is of an integrated structure, the upper movable teeth are formed at the upper end of the swing arm, and the lower movable teeth are formed at the lower end of the swing arm.

3. The seat according to claim 1, wherein: the back support arm is of an integrated structure, and the back guide teeth are formed at the end part of the back support arm; the lower support arm is of an integrated structure, and the lower guide teeth are formed at the end part of the lower support arm.

4. The seat according to claim 1, wherein: the contour path of the back guide tooth is arc-shaped; the contour path of the lower guide tooth is arc-shaped.

5. The seat according to claim 1, wherein: the transmission swinging assembly further comprises an inner side support plate and an outer side support plate which are arranged on the inner side and the outer side of the swinging arm, and the inner side support plate is overlapped with the outer side support plate left and right; the inner support plate, the outer support plate and the center position of the swing arm are rotationally connected to the same rotation point; the upper end of the inner support plate and the upper end of the outer support plate are rotationally connected with the back support arm at the same rotation point; the lower end of the outer support plate is rotationally connected with the lower support arm; the seat linkage is rotatably connected to one of the inner support plate or the outer support plate.

6. The seat according to claim 5, wherein: the lower rotation limiting mechanism comprises an arc-shaped lower limiting groove arranged on one of the outer support plate and the lower support arm and a lower limiting pin correspondingly arranged on the other of the outer support plate and the lower support arm and penetrating through the lower limiting groove.

7. The seat according to claim 6, wherein: the lower limit groove is arranged on the outer support plate, and the lower limit groove is configured into at least two circumferentially spaced grooves.

8. The seat according to claim 5, wherein: an upper rotation limiting mechanism is arranged between one of the inner support plate or the outer support plate and the back support arm; the upper rotation limiting mechanism comprises an arc-shaped upper limiting groove and an upper limiting pin penetrating through the upper limiting groove.

9. A seat as claimed in claim 6 or 8, wherein: in the initial sitting position, the swing arm is inclined forward and downward from back to front.

10. The seat according to claim 5, wherein: the seat linkage piece extends forward and upward from the side part of the seat frame, and the seat connecting piece is rotationally connected with the upper part of the inner support plate.

11. The seat according to claim 1, wherein: the guide bracket extends forwards and upwards, and a balance guide mechanism is arranged between the front end of the guide bracket and the seat frame; the balance guide mechanism comprises two upper and lower spaced rolling transverse shafts arranged at the front end of the guide bracket and a balance guide plate arranged at the front end of the seat frame and extending backwards; the balance guide plate is clamped between the two rolling transverse shafts and is arranged tangentially to any one of the rolling transverse shafts; the rolling transverse shaft can roll in place relative to the guide bracket.

12. The seat according to claim 11, wherein: in the initial sitting position, the seat frame is in a front high and rear low state; the balance guide plate is inclined towards the rear lower side from front to back; and the included angle between the balance guide plate and the seat frame is an acute angle.

13. The seat according to claim 11, wherein: in the initial position, the connecting line between the axes of the two rolling transverse shafts is perpendicular to the length direction of the balance guide plate.

14. The seat according to claim 1, wherein: the both sides of guide bracket are equipped with the side support plate respectively, lower support arm sets up on this side support plate.