CN111035167A - Chair frame - Google Patents

Abstract

The invention discloses a chair frame, which comprises bottom feet, a fixed seat, a chair back frame, a chair seat frame, a telescopic device, a linkage rod, a left linkage plate, a right linkage plate and two fourth connecting rods, wherein the front end of the telescopic device is hinged with the fixed seat, the rear end of the telescopic device is hinged with the middle section of the linkage rod, the upper end of the linkage plate is hinged with the side face of the bottom of the chair back frame, the lower end of the linkage plate is hinged with the side face of the fixed seat, the middle sections of the two linkage plates are respectively and fixedly connected with the left end and the right end of the linkage rod, the bottom end of the fourth connecting rod is hinged with the side face of the fixed seat, the top end of the fourth connecting rod; by the technical scheme, the chair seat frame moves upwards and backwards while the chair back frame topples backwards, and moves forwards and downwards in the process of lifting the chair back frame, and the distance between the bottom of the chair back frame and the rear part of the chair seat frame is kept unchanged, so that the zero displacement effect is achieved, and the back rubbing phenomenon of the back of a human body and the back of a chair is avoided.

Description

Chair frame

Technical Field

The invention relates to the technical field of furniture, in particular to a chair frame.

Background

The comfort level of the chair is directly related to the working and life quality of people. More and more enterprises are studying seat-back linkage mechanisms to realize self-adaptive functions and improve the comfort of the seat.

The seat back linkage mechanism used by the existing seat on the market is complex in structure and high in production and processing difficulty, so that the cost is high; for example, chinese patent publication No. CN104223821B discloses a swivel chair chassis, which comprises a four-bar mechanism consisting of a plurality of links, a bracket and a base, wherein when a rocker connected to a backrest rotates, the bracket connected to a seat moves upward and backward as a whole, and the backrest tilting restoring force is correspondingly matched according to the weight of a human body, so that a person with no matter light or heavy weight can easily tilt and return to lift up; the chassis mechanism is mainly suitable for office chairs; for a leisure chair, a large-angle backward leaning rest is usually required, so that the front end of a chair seat is required to be tilted, and a seat-back linkage mechanism which is simple in structure and easy to process and manufacture needs to be researched to meet the market requirement.

Thus, chinese patent publication No. CN109984499A discloses a seat-back synchronous linkage device and a seat, including a base for connecting an air rod, a bracket for connecting a seat, and a rocker for connecting a backrest; the base, the bracket and the wane are connected through a first connecting rod, a second connecting rod and a third connecting rod to form a four-bar linkage; two sides of the lower end of the rocker extend forwards to form side plates, one end of the first connecting rod is hinged with the base and the rear part of the bracket, and the other end of the first connecting rod is hinged with the lower end of the rocker; one end of the third connecting rod is hinged with the front end of the base, and the other end of the third connecting rod is hinged with the front end of the side plate; one end of the second connecting rod is hinged with the bracket, and the other end of the second connecting rod is hinged with the middle part of the third connecting rod. When the rocker is driven by stress to send rotation, the front end of the bracket is driven to tilt under the action of the first connecting rod, the second connecting rod and the third connecting rod. The invention is assembled by adopting simple connecting rods, has simple structure, simple process and high stability, and greatly reduces the production cost.

However, in the process of using, those skilled in the art find that when the backrest is at a relatively large reclining angle, the included angle between the seat back and the horizontal plane is also at a relatively large state, so that the force of the human body on the chair is totally concentrated on the backrest, thereby causing the following problems:

1) the gravity centers of the human body and the chair move backwards, so that the chair is easy to tip backwards;

2) the backrest can bear larger acting force, so that the stability of the material and the structure of the backrest needs to be improved, and the production cost is improved;

3) correspondingly, the chair mainly provides the supporting force for the back of the human body through the backrest, the seat back only has the function of fixing the position of the human body to the buttocks of the human body and does not conform to the stress condition of the human body when the human body normally lies down, so that the human body is not in a comfortable state on the whole, and the human body can feel tired after the chair is supine for a long time.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a seat frame in which a seat frame and a back frame are linked by a seat back and the seat frame does not rotate backward or rotates backward by a small angle when the back frame is at a relatively large backward tilt angle.

In order to achieve the purpose, the invention adopts the following technical scheme:

a chair frame comprises feet, a fixed seat, a chair back frame and a chair seat frame, wherein the fixed seat is fixedly connected with the feet, the chair back frame and the chair seat frame are movably arranged on the fixed seat, and the chair frame is characterized in that,

the foldable chair back frame is characterized by further comprising a telescopic device, a linkage rod, a left linkage plate, a right linkage plate and two fourth connecting rods, wherein the front end of the telescopic device is hinged with the fixed seat, the rear end of the telescopic device is hinged with the middle section of the linkage rod, the upper end of the linkage plate is hinged with the bottom side face of the chair back frame, the lower end of the linkage plate is hinged with the side face of the fixed seat, the middle sections of the two linkage plates are fixedly connected with the left end and the right end of the linkage rod respectively, the bottom end of each fourth connecting rod is hinged with the side face of the fixed seat, the top end of each fourth connecting rod is hinged with the bottom side face of the chair back frame, the fourth connecting rods on;

the chair seat comprises a fixed seat frame, and is characterized by further comprising a left first connecting rod, a right first connecting rod and two second connecting rods, wherein the first connecting rods are rotatably arranged on the side surfaces of the fixed seat; the first connecting rod and the second connecting rod on one side, the seat frame and the fixed seat form a four-bar linkage mechanism, the bottom end of the first connecting rod is in transmission connection with the linkage plate or the fourth connecting rod, and the movement of the seat frame is further controlled by the expansion of the telescopic device;

when the angle of the back frame inclining backwards is increased, the seat frame is driven to rise and move backwards, and when the angle of the back frame inclining backwards is decreased, the seat frame is driven to fall and move forwards.

Preferably, in the rotating process of the first connecting rod and the second connecting rod, the top end of the first connecting rod is always positioned in front of the bottom end of the first connecting rod, and the top end of the second connecting rod is always positioned in front of the bottom end of the second connecting rod; the turning radius of the top end of the first connecting rod is not smaller than that of the top end of the second connecting rod.

Preferably, the linkage plate is positioned behind the fourth connecting rod, and the top end of the linkage plate is higher than the top end of the fourth connecting rod, or the linkage plate is positioned in front of the fourth connecting rod, and the top end of the linkage plate is lower than the top end of the fourth connecting rod;

when the backward tilting angle of the chair back frame is increased, the distance between the top end of the linkage plate and the top end of the fourth connecting rod in the vertical direction is reduced; when the backward tilting angle of the chair back frame is reduced, the distance between the top end of the linkage plate and the top end of the fourth connecting rod in the vertical direction is increased.

Preferably, when the retractable device is retracted, the angle of the back frame tilting backward increases and simultaneously drives the seat frame to rise and move backward, and when the retractable device is extended, the angle of the back frame tilting backward decreases and simultaneously drives the seat frame to fall and move forward.

Preferably, when the linkage plate is positioned behind the fourth connecting rod, the top end of the linkage plate is always positioned in front of the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned behind the bottom end of the fourth connecting rod in the rotating process; when the linkage plate is positioned in front of the fourth connecting rod, the top end of the fourth connecting rod is always positioned in front of the bottom end of the fourth connecting rod in the rotating process, and the top end of the linkage plate is always positioned behind the bottom end of the linkage plate in the rotating process.

Further preferably, the left connecting rod and the right connecting rod are further arranged, the rear ends of the third connecting rods are hinged to the linkage plate, and the front ends of the third connecting rods are hinged to the bottom ends of the first connecting rods.

Preferably, when the retractable device is extended, the angle of the back frame tilting backward increases and simultaneously drives the seat frame to rise and move backward, and when the retractable device is shortened, the angle of the back frame tilting backward decreases and simultaneously drives the seat frame to fall and move forward.

Preferably, when the linkage plate is positioned behind the fourth connecting rod, the top end of the linkage plate is always positioned behind the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned in front of the bottom end of the fourth connecting rod in the rotating process; when the linkage plate is positioned in front of the fourth connecting rod, the top end of the linkage plate is always positioned in front of the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned behind the bottom end of the fourth connecting rod in the rotating process.

Further preferably, the device is further provided with a left fifth connecting rod, a right fifth connecting rod and two sixth connecting rods, the fifth connecting rods are rotatably arranged on the side faces of the fixing seat, the top ends of the fifth connecting rods are hinged to the bottom ends of the first connecting rods, the bottom ends of the fifth connecting rods are hinged to the front ends of the sixth connecting rods, and the rear ends of the sixth connecting rods are hinged to the linkage seat.

Preferably, the linkage rod is further provided with a left reinforcing plate and a right reinforcing plate, the reinforcing plates are fixedly connected with the two ends of the linkage rod or integrally formed, and the linkage plate is fixed on the reinforcing plates at least through two mounting holes.

Preferably, the retractable means is at least one of a gas lever, an electrically operated gas lever and a spring.

The invention has the technical effects that:

1) when the back of the chair frame emptys backwards, the seat frame moves backwards upwards, the distance between the bottom of the back of the chair frame and the rear part of the seat frame is kept unchanged all the time in the process of falling of the back of the chair frame, correspondingly, in the process of rising of the back of the chair frame, the seat frame moves downwards forwards, the distance between the bottom of the back of the chair frame and the rear part of the seat frame is kept unchanged in the process of rising of the back of the chair frame, thus, the zero displacement effect is achieved, the back rubbing phenomenon of the back of the human body and the back of the chair is avoided, and further, the electric air rod can be selected and used by the telescopic device, an electric chair is formed, and people are assisted to lie down and get up through the electric.

2) When scalable device is gas pole and spring, back of the chair frame and seat frame linkage can reach an effect, when the human body got up from the state of lying down promptly, the decurrent power of seat support can be given for the back, and the help human body stands up, rather than the simple restoring force through gas pole or spring (if the elasticity that improves gas pole power and spring, can increase the degree of difficulty of lying down), the degree of difficulty when this kind of structure can alleviate greatly and rises, improves the seat travelling comfort.

3) The lift of chair seat frame is controlled through four-bar mechanism, can make the seat support frame do not rotate or turned angle reduces at the lift in-process, be in when great angle of heeling back when the chair back frame is like this, the contained angle of chair seat frame and horizontal plane can still be in less state, the chair is still concentrated with human buttock to the holding power of human body like this, accord with the human atress condition when normally lying down, make the human body be in comfortable state, and reduced the distance that chair and human focus moved backward, and then the stability of chair has been improved.

Drawings

FIG. 1 is a schematic structural diagram of a chair frame 1 according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a chair frame according to an embodiment of the present invention, which is shown in FIG. 2 (the chair seat frame is omitted);

FIG. 3 is a schematic structural diagram of two four-bar linkages in a chair frame according to an embodiment of the present invention 1;

fig. 4 is a schematic structural diagram of two four-bar linkages in a chair frame according to an embodiment of the invention 2.

Description of reference numerals: 6. footing; 2. a fixed seat; 3. a back of chair frame; 4. a chair seat frame; 21. a base plate; 22. a side plate; 23. Fixing the rod; 31. a connecting frame; 41. a connecting member; 5. a retractable device; 10. a linkage rod; 11. a linkage plate; 12. a fourth link; 13. a first link; 14. a second link; 15. a third link; 16. a reinforcing plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

as shown in fig. 1-4, a chair frame comprises feet 6, a fixed seat 2, a back-of-chair frame 3 and a chair seat frame 4, wherein the fixed seat 2 is fixedly connected with the feet 6, and the back-of-chair frame 3 and the chair seat frame 4 are movably arranged on the fixed seat 2;

the fixed seat 2 comprises a bottom plate 21, two side plates 22 on two sides of the bottom plate 21 and a fixed rod 23 connected with the front half parts of the two side plates 22, wherein the two side plates 22 are fixedly connected with the bottom plate 21 and the fixed rod 23 or integrally formed;

the chair back frame 3 comprises a chair back frame 32 and a connecting frame 31, the connecting frame 31 comprises a horizontal frame and a vertical frame, an included angle between the horizontal frame and the vertical frame is between 90 degrees and 120 degrees, and the vertical frame is fixedly connected with the lower end of the chair back frame 32 or integrally formed with the lower end of the chair back frame;

the seat frame 4 comprises a seat part and a left connecting piece and a right connecting piece 41 which are positioned below the seat part, and the two connecting pieces 41 are fixedly connected with the seat part or integrally formed;

the foldable chair back frame comprises a telescopic device 5, a linkage rod 10, a left linkage plate 11, a right linkage plate 11 and two fourth connecting rods 12, wherein the front end of the telescopic device 5 is hinged to a fixed rod 23, the rear end of the telescopic device is hinged to the middle section of the linkage rod 10, the upper end of the linkage plate 11 is hinged to the side face of a horizontal frame, the lower end of the linkage plate 11 is hinged to a side plate 22, the middle sections of the two linkage plates 11 are fixedly connected with the left end and the right end of the linkage rod 10 respectively, the bottom end of each fourth connecting rod 12 is hinged to the side plate 22, the top end of each fourth connecting rod is hinged to the side face of the horizontal frame, the fourth connecting rods 12 and the linkage plates 11 on one side form a four-;

the connecting device further comprises a left first connecting rod 13, a right first connecting rod 13 and two second connecting rods 14, wherein the first connecting rods 13 are rotatably arranged on the side plates 22, the top ends of the first connecting rods 13 are hinged with the side faces of the connecting pieces 41, the top ends of the second connecting rods 14 are hinged with the side faces of the connecting pieces 41, and the bottom ends of the second connecting rods 14 are hinged with the side plates 22; the first connecting rod 13 and the second connecting rod 14 on one side, the connecting piece 41 and the side plate 22 form a four-bar linkage, the bottom end of the first connecting rod 13 is in transmission connection with the linkage plate 11 or the fourth connecting rod 12, and the movement of the chair seat frame 4 is controlled through the expansion of the telescopic device 5;

when the backward tilting angle of the backrest frame 3 increases, the seat frame 4 is driven to rise and move backward, and when the backward tilting angle of the backrest frame 3 decreases, the seat frame 4 is driven to fall and move forward.

In the embodiment of the present application, during the rotation of the first link 13 and the second link 14, the top end of the first link 13 is always located in front of the bottom end of the first link 13, and the top end of the second link 14 is always located in front of the bottom end of the second link 14; the rotating radius of the top end of the first connecting rod 13 is not lower than that of the top end of the second connecting rod 14; this is provided to ensure that the seat frame 4 moves rearward while being raised and moves forward while being lowered.

When the first connecting rod 13 and the second connecting rod 14 are parallel all the time in the rotating process, the rotating radius of the top end of the first connecting rod 13 is equal to the rotating radius of the top end of the second connecting rod 14, so that the seat frame 4 can not rotate; when the first connecting rod 13 and the second connecting rod 14 are not parallel in the rotating process, the rotating radius of the top end of the first connecting rod 13 is larger than that of the top end of the second connecting rod 14, and the rotating angle of the seat frame 4 can be reduced due to the second connecting rod 14, so that people can lie comfortably.

In the embodiment of the present application, the linkage plate 11 is located behind the fourth connecting rod 12, and the hinge point on the linkage plate 11 is higher than the hinge point on the fourth connecting rod 12, or the linkage plate 11 is located in front of the fourth connecting rod 12, and the hinge point on the linkage plate 11 is lower than the hinge point on the fourth connecting rod 12;

when the backward tilting angle of the backrest frame 3 is increased, the distance between the hinge point on the linkage plate 11 and the hinge point on the fourth connecting rod 12 in the vertical direction is reduced; when the backward tilting angle of the backrest frame 3 is decreased, the distance between the hinge point on the linkage plate 11 and the hinge point on the fourth link 12 in the vertical direction is increased.

In the embodiment of the present application, when the retractable device 5 is shortened, the backward tilting angle of the seat back frame 3 is increased and the seat back frame 4 is driven to rise and move backward at the same time, and when the retractable device 5 is extended, the backward tilting angle of the seat back frame 3 is decreased and the seat back frame 4 is driven to fall and move forward at the same time.

Wherein, the first position relation between the linkage plate 11 and the fourth connecting rod 12 is as follows: when the linkage plate 11 is positioned behind the fourth connecting rod 12, the top end of the linkage plate 11 is always positioned in front of the bottom end of the linkage plate 11 in the rotating process, and the top end of the fourth connecting rod 12 is always positioned behind the bottom end of the fourth connecting rod 12 in the rotating process; when the linkage plate 11 is located in front of the fourth connecting rod 12, the top end of the fourth connecting rod 12 is always located in front of the bottom end of the fourth connecting rod 12 in the rotating process, and the top end of the linkage plate 11 is always located behind the bottom end of the linkage plate 11 in the rotating process.

The second position relationship between the linkage plate 11 and the fourth connecting rod 12 is as follows: when the linkage plate 11 is positioned behind the fourth connecting rod 12, and the top end of the linkage plate 11 is always positioned in front of the bottom end of the linkage plate 11 in the rotating process, and the top end of the fourth connecting rod 12 is always positioned in front of the bottom end of the fourth connecting rod 12 in the rotating process, the rotating radius of the top end of the linkage plate 11 is larger than that of the top end of the fourth connecting rod 12; when the linkage plate 11 is located in front of the fourth connecting rod 12, and the top end of the linkage plate 11 is always located in front of the bottom end of the linkage plate 11 in the rotating process, and the top end of the fourth connecting rod 12 is always located in front of the bottom end of the fourth connecting rod 12 in the rotating process, the rotating radius of the top end of the linkage plate 11 is smaller than that of the top end of the fourth connecting rod 12.

The third position relation between the linkage plate 11 and the fourth connecting rod 12 is as follows: when the linkage plate 11 is positioned behind the fourth connecting rod 12, and the top end of the linkage plate 11 is always positioned behind the bottom end of the linkage plate 11 in the rotating process, and the top end of the fourth connecting rod 12 is always positioned behind the bottom end of the fourth connecting rod 12 in the rotating process, the rotating radius of the top end of the linkage plate 11 is larger than that of the top end of the fourth connecting rod 12; when the linkage plate 11 is located in front of the fourth connecting rod 12, and the top end of the linkage plate 11 is always located behind the bottom end of the linkage plate 11 in the rotating process, and the top end of the fourth connecting rod 12 is always located behind the bottom end of the fourth connecting rod 12 in the rotating process, the rotating radius of the top end of the linkage plate 11 is smaller than that of the top end of the fourth connecting rod 12.

In the embodiment of the application, a left third connecting rod and a right third connecting rod 15 are further arranged, the rear end of each third connecting rod 15 is hinged to the linkage plate 11, and the front end of each third connecting rod 15 is hinged to the bottom end of the corresponding first connecting rod 13.

In the embodiment of the application, a left reinforcing plate and a right reinforcing plate 16 are further arranged, the reinforcing plates 16 are fixedly connected with two ends of the linkage rod 10 or integrally formed, and the linkage plate 11 is fixed on the reinforcing plates 16 through at least two mounting holes; the arrangement improves the stability of the four-bar mechanism.

In the embodiment of the present application, the retractable device 5 is at least one of an air lever, an electric air lever and a spring.

Wherein, when telescoping device 5 is gas pole and spring, back of the chair frame 3 and seat frame 4 linkage, can reach an effect, when the human body gets up from the state of lying down promptly, the decurrent power of seat support can be transmitted for the back, help the human body stands up, rather than the simple resilience through the spring (if the elasticity of spring is improved to one taste, can increase the degree of difficulty of lying down), and the gas pole plays the effect of locking back of the chair frame and seat frame wherein, the degree of difficulty when this kind of structure can alleviate the stand greatly, improve the seat travelling comfort.

When the telescopic device 5 is an electric air rod, the back of a person can lean against the backrest frame 3, the backrest frame 3 can be driven by the electric air rod to lift to help the person lie down and get up, and the person can completely relax in the process and completely help the person lie down and get up by the electric air rod.

In this embodiment, a telescopic rod is further provided, the bottom end of the telescopic rod is fixedly connected with the bottom foot 6, and the fixing seat 2 is fixed at the top end of the telescopic rod.

In the embodiment of the present application, the third connecting rod 15 is composed of a first connecting portion and a second connecting portion which are integrally formed, the included angle between the first connecting portion and the second connecting portion is greater than 90 degrees and less than 180 degrees, preferably 135 degrees, the outer end direction of the second connecting portion faces downwards, the outer end of the first connecting portion is hinged to the linkage plate 11, and the outer end of the second connecting portion is hinged to the bottom end of the first connecting rod. This is because the third link 15 is the main stress bar when a person sits on the seat frame 4, and the structural strength of the third link 15 can be improved by setting the included angle.

In the embodiment of the application, the main body of the linkage plate 11 is L-shaped, the lower end of the linkage plate 11 extends downwards to form a first extension portion, the upper end of the linkage plate 11 extends upwards in an inclined manner to form a second extension portion, wherein the upper end of the linkage plate 11 extends upwards in an inclined manner within an angle range of 30-60 degrees, preferably 45 degrees, the bottom end of the first extension portion is hinged to the side plate, the top end of the first extension portion is hinged to the outer end of the first connecting portion, the top end of the second extension portion is hinged to the side face of the horizontal frame, and corners of the main bodies of the two linkage plates 11 are fixedly connected to the. So set up because when the back of the chair frame 5 is located a great angle of leaning back and people lie on the chair, linkage board 11 is the main atress spare part, forms the contained angle through setting up second extension and linkage board 11 main part and can provide linkage board 11's structural strength

Example two:

the difference between the present embodiment and the first embodiment is: when the telescopic device is extended, the backward inclining angle of the chair back frame is increased, and the chair seat frame is driven to rise and move backwards at the same time.

Wherein, the first position relation of the linkage plate and the fourth connecting rod is as follows: when the linkage plate is positioned behind the fourth connecting rod, the top end of the linkage plate is always positioned behind the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned in front of the bottom end of the fourth connecting rod in the rotating process; when the linkage plate is positioned in front of the fourth connecting rod, the top end of the linkage plate is always positioned in front of the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned behind the bottom end of the fourth connecting rod in the rotating process.

The second position relation between the linkage plate and the fourth connecting rod is as follows: when the linkage plate is positioned behind the fourth connecting rod, and the top end of the linkage plate is always positioned in front of the bottom end of the linkage plate in the rotating process and the top end of the fourth connecting rod is always positioned in front of the bottom end of the fourth connecting rod in the rotating process, the rotating radius of the top end of the linkage plate is smaller than that of the top end of the fourth connecting rod; when the linkage plate is positioned in front of the fourth connecting rod, and the top end of the linkage plate is always positioned in front of the bottom end of the linkage plate in the rotating process and the top end of the fourth connecting rod is always positioned in front of the bottom end of the fourth connecting rod in the rotating process, the rotating radius of the top end of the linkage plate is larger than that of the top end of the fourth connecting rod.

The third position relation of the linkage plate and the fourth connecting rod is as follows: when the linkage plate is positioned behind the fourth connecting rod, and the top end of the linkage plate is always positioned behind the bottom end of the linkage plate in the rotating process and the top end of the fourth connecting rod is always positioned behind the bottom end of the fourth connecting rod in the rotating process, the rotating radius of the top end of the linkage plate is smaller than that of the top end of the fourth connecting rod; when the linkage plate is positioned in front of the fourth connecting rod, and the top end of the linkage plate is always positioned behind the bottom end of the linkage plate in the rotating process, and the top end of the fourth connecting rod is always positioned behind the bottom end of the fourth connecting rod in the rotating process, the rotating radius of the top end of the linkage plate is larger than that of the top end of the fourth connecting rod.

In this application embodiment, still be equipped with about two fifth connecting rods and two sixth connecting rods, the side of the rotatable installation fixing base of fifth connecting rod is on the curb plate promptly, the fifth connecting rod top is articulated with first connecting rod bottom and fifth connecting rod bottom is articulated with the sixth connecting rod front end, sixth connecting rod rear end is articulated with the link plate.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A chair frame comprises feet (6), a fixed seat (2), a chair back frame (3) and a chair seat frame (4), wherein the fixed seat (2) is arranged on the feet (6), the chair back frame (3) comprises a chair back frame (32) and a connecting frame (31) which are fixedly connected or integrally formed, the connecting frame (31) and the chair seat frame (4) are movably arranged on the fixed seat (2), the chair frame is characterized in that,

the foldable chair back frame is characterized by further comprising a telescopic device (5), a linkage rod (10), a left linkage plate (11), a right linkage plate (11) and two fourth connecting rods (12), wherein the front end of the telescopic device (5) is hinged to a fixing seat (2), the rear end of the telescopic device is hinged to the linkage rod (10), the upper end of the linkage plate (11) is hinged to the side face of the bottom of the chair back frame (3), the lower end of the linkage plate is hinged to the fixing seat (2), the middle sections of the two linkage plates (11) are fixedly connected with the left end and the right end of the linkage rod (10), the bottom end of each fourth connecting rod (12) is hinged to the side face of the fixing seat (2), the top end of each fourth connecting rod is hinged to the bottom of the chair back frame (3), the fourth connecting rods (12) and the linkage plates (11) on one side form a four-bar mechanism with a connecting frame (31) and the fixing;

the chair seat is characterized by further comprising a left first connecting rod (13) and a right first connecting rod (13) and two second connecting rods (14), wherein the first connecting rods (13) are rotatably arranged on the side faces of the fixed seat (2), the top ends of the first connecting rods (13) are hinged with the side faces of the chair seat frame (4), the top ends of the second connecting rods (14) are hinged with the side faces of the chair seat frame (4), and the bottom ends of the second connecting rods (14) are hinged with the side faces of the fixed seat (; a first connecting rod (13) and a second connecting rod (14) at one side form a four-bar linkage with the seat frame (4) and the fixed seat (2), the bottom end of the first connecting rod (13) is in transmission connection with the linkage plate (11) or the fourth connecting rod (12), and then the movement of the seat frame (4) is controlled by the extension of the telescopic device (5);

when the backward inclining angle of the chair back frame (3) is increased, the chair seat frame (4) is driven to rise and move backwards, and when the backward inclining angle of the chair back frame (3) is decreased, the chair seat frame (4) is driven to fall and move forwards.

2. A chair frame according to claim 1, characterized in that during the rotation of the first link (13) and the second link (14), the top end of the first link (13) is always located in front of the bottom end of the first link (13), and the top end of the second link (14) is always located in front of the bottom end of the second link (14); the rotating radius of the top end of the first connecting rod (13) is not less than that of the top end of the second connecting rod (14).

3. A chair frame according to claim 1, characterized in that when the telescopic device (5) is shortened, the angle of the back frame (3) tilting backwards increases and at the same time the seat frame (4) is lifted and moved backwards, and when the telescopic device (5) is extended, the angle of the back frame (3) tilting backwards decreases and at the same time the seat frame (4) is lowered and moved forwards.

4. A chair frame according to claim 3, characterized in that when the linkage plate (11) is located behind the fourth connecting rod (12), the top end of the linkage plate (11) is always located in front of the bottom end of the linkage plate (11) during rotation and the top end of the fourth connecting rod (12) is always located behind the bottom end of the fourth connecting rod (12) during rotation; when the linkage plate (11) is positioned in front of the fourth connecting rod (12), the top end of the fourth connecting rod (12) is always positioned in front of the bottom end of the fourth connecting rod (12) in the rotating process, and the top end of the linkage plate (11) is always positioned behind the bottom end of the linkage plate (11) in the rotating process.

5. A chair frame according to claim 3, characterized in that a left and a right third connecting rods (15) are provided, the rear ends of the third connecting rods (15) are hinged with the linkage plate (11) and the front ends are hinged with the bottom ends of the first connecting rods (13).

6. A chair frame according to claim 1, characterized in that when the telescopic device (5) is extended, the angle of backward tilting of the backrest frame (3) increases and simultaneously brings the seat frame (4) up and backward moving, and when the telescopic device (5) is shortened, the angle of backward tilting of the backrest frame (3) decreases and simultaneously brings the seat frame (4) down and forward moving.

7. A chair frame according to claim 6, characterized in that when the linkage plate (11) is located behind the fourth connecting rod (12), the top end of the linkage plate (11) is always located behind the bottom end of the linkage plate (11) during rotation and the top end of the fourth connecting rod (12) is always located in front of the bottom end of the fourth connecting rod (12) during rotation; when the linkage plate (11) is positioned in front of the fourth connecting rod (12), the top end of the linkage plate (11) is always positioned in front of the bottom end of the linkage plate (11) in the rotating process, and the top end of the fourth connecting rod (12) is always positioned behind the bottom end of the fourth connecting rod (12) in the rotating process.

8. A chair frame according to claim 6, characterized in that two fifth connecting rods and two sixth connecting rods are arranged on the left and right, the fifth connecting rods are rotatably arranged on the side surfaces of the fixed seat (2), the top ends of the fifth connecting rods are hinged with the bottom end of the first connecting rod (13), the bottom ends of the fifth connecting rods are hinged with the front end of the sixth connecting rod, and the rear ends of the sixth connecting rods are hinged with the linkage seat.

9. A chair frame according to claim 1, characterised in that said telescopic means (5) is at least one of a pneumatic rod, an electric pneumatic rod and a spring.

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