CN111053390A - Chair with detachable top - Google Patents

Abstract

The invention discloses a chair, which comprises bottom feet, a fixed seat, a chair back frame, a chair seat frame, a first linkage frame and a second linkage frame, wherein the first linkage frame is fixedly connected with the bottom end of the chair back frame or is integrally formed and rotatably arranged on the fixed seat; the second linkage frame is fixedly connected with the bottom surface of the chair seat frame or integrally formed and movably arranged on the fixed seat; the device also comprises a left set of first connecting rod mechanisms, a right set of first connecting rod mechanisms, a left set of fourth connecting rods, a right set of fourth connecting rods, a left set of second limiting long holes, a right set of second limiting long holes, at least one third connecting rod, a left set of springs, a right set of springs and an air rod; when the chair back frame is inclined backwards, the chair seat frame moves backwards and upwards correspondingly, the chair seat frame moves downwards and forwards 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 with detachable top

Technical Field

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

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 supporting force for the back of the human body through the backrest, the seat back only has a function of fixing the position of the seat back on 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 as a whole, and the human body feels tired after long-term lying on the back;

4) the legs of the human body are still in a bent state and cannot be unfolded, so that the human body cannot be relaxed in whole body and mind.

In order to solve the fourth technical problem, chinese patent publication No. CN109645726A discloses an electric integrated mechanism for a backrest and a footrest, comprising: the seat frame, the back rest, the leg rest assembly, the swing rod assembly and the rotary swing mechanism are used for realizing the forward extension of the leg rest assembly and the backward inclination of the back rest, the swing rod assembly is installed below the seat frame, and a notch swing disc is arranged on the swing rod assembly; the foot rest connecting rod assembly is respectively connected with the foot rest assembly and the seat frame and is used for realizing the telescopic folding of the foot rest assembly; the bracket connecting rod component is connected with a notch hinge; the backrest connecting rod assembly is respectively connected with the backrest and the swing rod assembly and is used for realizing the inclination of the backrest; the driving piece is respectively connected with the swing rod assembly and the leg rest assembly and drives the swing rod assembly and the leg rest assembly to move relatively; the rolling assembly is matched with a notch swinging disc on the swing rod assembly and a notch hinge on the leg rest connecting rod assembly to realize the forward extension and the backward contraction of the leg rest assembly and the backward tilting and the forward pitching of the backrest. This electronic disjunctor mechanism of back bracket can realize lifting of tilt up process and bracket through a motor, and it is less to fill a space, and stability is good.

However, the chair has the following defects found by the technicians in the field in the using process:

1) the device does not conform to the usual action of lying down and getting up; when people need to lie down, the footrest is firstly lifted and then the chair back falls down, when people need to lie down, the chair back is firstly lifted and then the footrest is descended, and the movement process is opposite to the usual action of people who lie down and get up;

2) the base in the chair is usually made of a material with higher strength as a main stress element, while other non-main stress elements are usually made of materials with ordinary strength for reducing the cost, but in the application, the motion mechanism of the base is not only the base; the leg rest component is also a main stressed component; therefore, the leg rest assembly also requires a stronger piece of material, thereby increasing costs;

3) the foot rest component has many parts for lifting and descending and has a complex structure.

Disclosure of Invention

In order to solve the above technical problems, it is an object of the present invention to provide a chair in which a seat frame and a back frame are linked by a seat back and the seat frame is not rotated backward or is rotated backward only 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 comprises feet, a fixed seat, a chair back frame, a chair seat frame, a first linkage frame and a second linkage frame, wherein the fixed seat is fixedly connected with the feet; the second linkage frame is fixedly connected with the bottom surface of the chair seat frame or integrally formed and movably arranged on the fixed seat; further comprising:

the left and right sets of first connecting rod mechanisms are arranged on the fixed seat, the first linkage frame and the second linkage frame and comprise a first connecting rod, a second connecting rod and a third connecting rod which are sequentially hinged, the top end of the first connecting rod is rotatably arranged on the first linkage frame, the second connecting rod is in an inverted V shape and is rotatably arranged on the side surface of the fixed seat by taking a corner as a rotating circle center, and the top end of the third connecting rod is rotatably arranged on the side surface of the second linkage frame;

the rear ends of the fourth connecting rods are hinged with the side face of the fixed seat, and the front ends of the fourth connecting rods are hinged with the side face of the second linkage frame;

the top ends of the second limiting long holes are positioned behind the bottom ends of the second limiting long holes;

the third linkage rod is inserted into the second limiting long hole and is in clearance fit with the second limiting long hole;

one end of the spring is arranged on the fixed seat, and the other end of the spring is arranged on the first connecting rod or the first linkage frame;

and one end of the air rod is rotatably arranged on the fixed seat, and the other end of the air rod is rotatably arranged on the first linkage frame or the second linkage frame.

Preferably, when the front end of the spring is installed on the fixed seat, the rear end of the spring is installed on the first connecting rod or the first linkage frame, and the spring is not in a stretching state;

when the rear end of the spring is installed on the fixed seat, the front end of the spring is installed on the first connecting rod or the first linkage frame, and the spring is not in a compressed state.

Preferably, the chair back frame is further provided with a left concave first limiting long hole and a right concave first limiting long hole, the first limiting long hole is positioned on the side surface of the fixed seat or the side surface of the second linkage frame, two sides of the first linkage frame are hinged with the fixed seat, the chair back frame rotates by taking a straight line passing through two hinged points of the first linkage frame and the fixed seat as a rotating central shaft, and the rotatable angle range of the chair back frame is 0-60 degrees through the first limiting long hole.

Preferably, the second limiting long hole is linear, and the top end of the second limiting long hole faces backwards; the included angle range of the second limiting long hole and the horizontal plane is 30-60 degrees.

Preferably, the second limiting long hole is in an arc shape, and the top end of the second limiting long hole is positioned behind the bottom end of the second limiting long hole; and the included angle range between the straight line passing through the top end of the second limit long hole and the bottom end of the second limit long hole and the horizontal plane is 30-60 degrees.

Preferably, when the two second limiting long holes are respectively and symmetrically arranged on two side surfaces of the fixed seat, the third linkage rod is fixedly connected with the second linkage frame;

when the two second limit long holes are respectively and symmetrically arranged on two side faces of the second linkage frame, the third linkage rod is fixedly connected with the fixed seat.

Preferably, when the fourth link is rotated upward with the rear end thereof as a rotation center to be parallel to a straight line passing through the top end of the second restriction long hole and the bottom end of the second restriction long hole, the required rotation angle is higher than 90 degrees.

As preferred, the fixing base front end is fixed with a first square pipe of horizontally, be equipped with both ends and control two first connecting rod fixed connection's first gangbar on the first link span, first gangbar is square pipe, still is equipped with two vertical fifth mounting panels that parallel and two vertical sixth mounting panels that parallel, fifth mounting panel bottom and first square pipe joint and top are articulated with gas pole front end, sixth mounting panel top is articulated with first gangbar joint and bottom and gas pole rear end, and then makes the rotatable installation of gas pole on the chair.

Preferably, the left and right first mounting plates are parallel and vertical, a rectangular notch is formed in the top end of each first mounting plate, the top end of each first mounting plate is connected with the lower surface and the front side face of the second linkage frame in a clamped mode through the rectangular notch, and the bottom end of each first mounting plate is hinged to the top end of the first connecting rod.

Preferably, the main body of the first connecting rod is in an L shape, the horizontal section of the first connecting rod extends forwards and downwards to form a first extending portion, the outer end of the first extending portion is hinged to the second connecting rod, the top end of the vertical section of the second connecting rod is hinged to the first mounting plate, and two ends of the first linkage rod are fixedly connected with corners of the horizontal section and the vertical section of the first connecting rod or integrally formed.

The invention has the technical effects that:

1) when the back frame is inclined backwards, the seat frame moves backwards upwards, the distance between the bottom of the back frame and the rear part of the seat frame is kept unchanged all the time in the process of falling the back frame, correspondingly, in the process of rising the back frame, the seat frame moves downwards forwards, the distance between the bottom of the back frame and the rear part of the seat frame is kept unchanged in the process of rising the back frame, and therefore 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.

2) The lift of chair seat frame is controlled through fourth connecting rod and second spacing groove, make the first half of chair seat frame along the spacing slot hole reciprocating motion of second at the lift in-process, operate steadily reliably, and the seat support frame is at the little or even not rotation of lift in-process turned angle, when the back of the chair frame is in great angle of bending back like this, the contained angle of chair seat frame and horizontal plane is still little with initial condition phase difference, the chair is still concentrated with human buttock to the holding power of human body like this, accord with the atress condition when the human body normally lies down, make the human body be in comfortable state, and reduced the distance that chair and human focus moved backward, and then improved the stability of chair.

3) In the invention, the air rod is used for locking the rotation of the chair back frame and the lifting of the chair seat frame, so that the chair back frame can stay at any angle in a rotatable range and the chair seat frame stays at any height in a lifting range.

4) In the invention, the spring is used for assisting people to get up from a lying state, and when the locking of the air rod is unlocked, the restoring force of the spring enables the chair back frame to rotate upwards so as to help people to get up.

Drawings

Fig. 1 is a schematic structural view of a chair according to an embodiment of the present invention, in which a footrest assembly is in a lowered state;

FIG. 2 is a schematic structural view of a chair according to an embodiment of the present invention (the footrest assembly is in a lowered state and the feet and the backrest frame are omitted);

FIG. 3 is a schematic structural view of a chair according to an embodiment of the present invention (the footrest assembly is in a lowered state and the feet and the backrest frame are omitted);

FIG. 4 is a schematic structural view of a chair according to an embodiment of the present invention, showing a footrest assembly in a raised state;

FIG. 5 is a schematic structural view of a chair according to an embodiment of the present invention, showing the footrest assembly in a raised state;

FIG. 6 is an enlarged view of a portion of FIG. 5 of the present invention;

FIG. 7 is an exploded view of a linkage assembly mounting structure according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a third chair according to the embodiment of the present invention 1;

fig. 9 is a schematic structural diagram of a third chair according to an embodiment of the present invention (the feet and the backrest frame are omitted) shown in fig. 2.

Description of reference numerals: 11. footing; 12. a fixed seat; 13. a back of chair frame; 14. a chair seat frame; 15. a footrest assembly; 16. a first linkage frame; 17. a second linkage frame; 18. a first electric push rod; 19. a first linkage rod; 20. a second electric push rod; 21. a second linkage rod; 22. a first link mechanism; 23. a fourth link mechanism; 24. a third link mechanism; 25. a linkage assembly; 26. a second link mechanism; 27. a first limit long hole; 221. a first link; 222. a second link; 223. a third link; 28. a first mounting plate; 29. a fifth mounting plate; 30. a sixth mounting plate; 31. a second limit long hole; 32. a third link lever; 231. a fourth link; 261. a fifth link; 262. a sixth link; 33. a third mounting plate; 34. a fourth mounting plate; 151. a first footrest; 152. a second footrest; 241. an eighth link; 242. a ninth link; 35. a first rotating shaft; 36. a third rotating shaft; 37. a second rotating shaft; 38. a first sphere; 39. a second sphere; 251. a connecting rod; 252. a linkage member; 40. a spring.

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. 1-5, a chair includes a bottom 11, a fixed seat 12, a back frame 13, a seat frame 14, a footrest assembly 15, a first linkage frame 16 and a second linkage frame 17, wherein the fixed seat 12 is fixedly connected with the bottom 11, and the first linkage frame 16 is fixedly connected with the bottom end of the back frame 13 or integrally formed and rotatably mounted on the fixed seat 12; the second linkage frame 17 is fixedly connected with the bottom surface of the seat frame 14 or integrally formed and movably arranged on the fixed seat 12; the footrest assembly 15 is rotatably mounted on the second linkage frame 17 or the seat frame 14, and further includes:

a first driving mechanism, including a first electric push rod 18, a first linkage rod 19, a left set of first link mechanism 22 and a right set of first link mechanism 22, and a left set of fourth link mechanism 23 and a right set of fourth link mechanism 23, the first link mechanism 22 is installed on the fixed seat 12, the first linkage frame 16 and the second linkage frame 17, the fourth link mechanism 23 is installed on the second linkage frame 17 and the fixed seat 12, two ends of the first linkage rod 19 are fixedly connected with or integrally formed with the rear half section of the first link mechanism 22, the front end of the first electric push rod 18 is hinged with the fixed seat 12, the rear end of the first electric push rod 18 is hinged with the first linkage rod 19, and further when the first electric push rod 18 extends, the first link mechanism 22 and the fourth link mechanism 23 drive the backrest frame 13 to rotate upwards and drive the seat frame 14 to move forwards and downwards, and when the first electric push rod 18 shortens, the first link mechanism 22 and the fourth link mechanism 23 drive the backrest frame 13 to rotate downwards and drive the seat frame 14 to move backwards and upwards (ii) a

The second driving mechanism comprises a second electric push rod 20, a second linkage rod 21, a third link mechanism 24, a linkage assembly 25 and a left set and a right set of second link mechanisms 26, the second link mechanisms 26 are arranged on the second linkage frame 17 and the footrest assembly 15, the third link mechanism 24 is arranged on the footrest assembly 15, the linkage assembly 25 is rotatably arranged on the chair seat frame 14 and is connected with the third link mechanism 24, the second linkage rod 21 is fixedly connected with the second link mechanism 26 or is integrally formed, the rear end of the second electric push rod 20 is hinged with the second linkage frame 17, the front end of the second electric push rod 20 is hinged with the second linkage rod 21, when the second electric push rod 20 is extended, the footrest assembly 15 is lifted by the second link mechanism 26, and during the process of lifting the footrest assembly 15, the linkage assembly 25 simultaneously drives the third link mechanism 24 to operate so as to extend the footrest assembly 15; when the second electric push rod 20 is shortened, the footrest assembly 15 is lowered through the second link mechanism 26, and in the process of lowering the footrest assembly 15, the linkage assembly 25 simultaneously drives the third link mechanism 24 to operate so as to shorten the footrest assembly 15.

In the embodiment of the application, a left concave first limiting long hole 27 and a right concave first limiting long hole 27 are further arranged, the first limiting long holes 27 can be positioned on the side surface of the fixed seat 12 and also can be positioned on the side surface of the second linkage frame 17, two sides of the first linkage frame 16 are hinged with the fixed seat 12, so that the back frame 13 rotates by taking a straight line passing through two hinged points of the first linkage frame 16 and the fixed seat 12 as a rotation central axis, and the rotatable angle range of the back frame 13 is 0-60 degrees through the first limiting long holes 27; further preferably, the back frame 13 is rotatable at an angle ranging from 0 degree to 45 degrees.

As shown in fig. 2 and 3, the first link mechanism 22 includes a first link 221, a second link 222 and a third link 223 hinged in sequence, the top end of the first link 221 is rotatably mounted on the first linkage frame 16, the second link 222 is in an inverted V shape and rotatably mounted on the side surface of the fixed base 12 with the corner as a rotation center, and the top end of the third link 223 is rotatably mounted on the side surface of the second linkage frame 17; two ends of the first linkage rod 19 are fixedly connected with the left first connecting rod 221 and the right first connecting rod 221 or integrally formed; further preferably, a left first mounting plate 28 and a right first mounting plate 28 which are parallel and vertical are further arranged, a rectangular notch is formed in the top end of each first mounting plate 28, the top end of each first mounting plate 28 is fixedly connected with the lower surface and the front side surface of the second linkage frame 17 through the rectangular notch, the first mounting plates are generally fixed through welding, and the bottom ends of the first mounting plates 28 are hinged to the top ends of the first connecting rods 221; with such an arrangement, the backrest frame 13 can be rotatably and stably mounted on the fixing base 12 within a certain range through the portion of the second link 222 connected to the first link 221, the first limit groove, and the first linking frame 16; the power for ascending or descending the seat frame 14 is given by the portion of the second link 222 connected to the third link 223 and the third link 223, and no restriction is made to the moving locus of the seat frame 14.

In the embodiment of the present application, the main body of the first link 221 is L-shaped, the horizontal section of the first link 221 extends forward and downward to form a first extension portion, the outer end of the first extension portion is hinged to the second link 222, the top end of the vertical section of the second link 222 is hinged to the first mounting plate 28, and two ends of the first linkage rod 19 are fixedly connected to or integrally formed with the corners of the horizontal section and the vertical section of the first link 221; so as to set; the structure is simple and reasonable, and the transmission of the motion relation between the chair back frame 13 and the chair seat frame 14 is facilitated.

In the embodiment of the application, a horizontal first square tube is fixed at the front end of the fixed seat 12, the first linkage rod 19 is a square tube, and two parallel vertical fifth mounting plates 29 and two parallel vertical sixth mounting plates 30 are further arranged, the bottom end of each fifth mounting plate 29 is fixedly connected with the first square tube, the top end of each fifth mounting plate is hinged to the front end of the first electric push rod 18, the top end of each sixth mounting plate 30 is fixedly connected with the first linkage rod 19, the bottom end of each sixth mounting plate is hinged to the rear end of the first electric push rod 18, and the first electric push rod 18 is rotatably mounted on the chair frame; preferably, a first rectangular notch is formed in the bottom end of the fifth mounting plate 29 and is welded to the front side (rear side) and the upper surface of the first square tube, a second rectangular notch is formed in the top end of the sixth mounting plate 30 and is welded to the rear side (front side), the upper surface and the lower surface of the second square tube, and the first electric push rod 18 is rotatably mounted on the chair frame under the combined action of the first square tube, the fifth mounting plate 29, the second square tube, the sixth mounting plate 30 and the first electric push rod 18; and the structure is stable, and the installation and the disassembly are convenient.

The left and right second limiting long holes 31 are further arranged, and the top ends of the second limiting long holes 31 are positioned behind the bottom ends of the second limiting long holes 31; the device is further provided with at least one third linkage rod 32 which is horizontally arranged, the third linkage rod 32 is inserted into the second limiting long holes 31 and is in clearance fit with the second limiting long holes 31, when only one third linkage rod 32 is arranged, the two second limiting long holes 31 are symmetrically arranged on two side faces of the fixed seat 12 respectively, two ends of the third linkage rod 32 are fixedly connected with two side faces of the second linkage frame 17 respectively, or the two second limiting long holes 31 are symmetrically arranged on two side faces of the second linkage frame 17 respectively, and two ends of the third linkage rod 32 are fixedly connected with two side faces of the fixed seat 12 respectively; considering that the third link 32 touches the first electric push rod 18, the second electric push rod 20 or the first link mechanism 22 during the movement, the middle section of the third link 32 can be cut off to form two separated third links 32.

In the embodiment of the present application, the second long limiting hole 31 is linear, and the top end of the second long limiting hole 31 faces rearward; the included angle range between the second limiting long hole 31 and the horizontal plane is 30-60 degrees, and further preferably, the included angle range between the second limiting long hole 31 and the horizontal plane is 40-50 degrees.

It should be noted that the second limiting long hole 31 may also be an arc line, and the top end of the second limiting long hole 31 is located behind the bottom end of the second limiting long hole 31; and the included angle between the straight line passing through the top end of the second limit long hole 31 and the bottom end of the second limit long hole 31 and the horizontal plane ranges from 30 degrees to 60 degrees, and further preferably, the included angle between the straight line and the horizontal plane ranges from 40 degrees to 50 degrees.

The main function of the fourth link mechanism 23 is to limit the movement of the front end of the second link frame 17, and in the embodiment of the present application, the fourth link mechanism 23 only includes the fourth link 231, the rear end of the fourth link 231 is hinged to the side of the fixed seat 12, and the front end of the fourth link 231 is hinged to the side of the second link frame 17.

When the fourth link 231 rotates upward with the rear end thereof as the rotation center to be parallel to the second long limiting hole 31 and the required rotation angle is not higher than 90 degrees, the movement process of the seat frame 14 is as follows: in the process that the back-seat frame 13 rotates upwards to drive the seat-seat frame 14 to move forwards and downwards, the front end of the seat-seat frame 14 rotates upwards, and in the process that the back-seat frame 13 rotates downwards to drive the seat-seat frame 14 to move backwards and upwards, the front end of the seat-seat frame 14 rotates downwards;

when the fourth link 231 rotates upward with the rear end thereof as the rotation center to be parallel to the second long limiting hole 31 and the required rotation angle is higher than 90 degrees, the first motion process of the seat frame 14 is: in the process that the back-seat frame 13 rotates upwards to drive the seat-seat frame 14 to move forwards and downwards, the front end of the seat-seat frame 14 rotates downwards and then rotates upwards, and in the process that the back-seat frame 13 rotates downwards to drive the seat-seat frame 14 to move backwards and upwards, the front end of the seat-seat frame 14 rotates upwards and then rotates downwards;

the second motion process of seat frame 14 is: in the process that the back-seat frame 13 rotates upwards to drive the seat-seat frame 14 to move forwards and downwards, the front end of the seat-seat frame 14 rotates downwards, and in the process that the back-seat frame 13 rotates downwards to drive the seat-seat frame 14 to move backwards and upwards, the front end of the seat-seat frame 14 rotates upwards;

therefore, in the embodiment of the present application, by adjusting the relevant parameters of the second limiting long hole 31 and the fourth link 231, the seat frame 14 can only rotate a small angle or even not rotate when the seat back frame 13 rotates from the highest position to the lowest position.

In the embodiment of the present application, the second linkage 26 includes a fifth link 261 and a sixth link 262, the fifth link 261 is rotatably installed on the side of the second linkage frame 17, one end of the fifth link 261 is hinged with one end of the sixth link 262, and the other end of the sixth link 262 is rotatably installed on the side of the footrest assembly 15; both ends of the second linkage rod 21 are fixedly connected with the left and right fifth links 261 or integrally formed.

Preferably, the electric power tool is further provided with two parallel vertical third mounting plates 33 and two parallel vertical fourth mounting plates 34, the second linkage rod 21 is a square tube, the bottom end of the third mounting plate 33 is fixedly connected with the second linkage rod 21, such as welded, and the top end of the third mounting plate is hinged to the front end of the second electric push rod 20, the top end of the fourth mounting plate 34 is fixedly connected with the second linkage frame 17, such as welded, and the bottom end of the fourth mounting plate is hinged to the rear end of the second electric push rod 20; the third mounting plate 33 is mounted on the second linkage rod 21 and the fourth mounting plate 34 is mounted on the second linkage frame 17 by the cooperation of the third mounting plate 33, the fourth mounting plate 34 and the second electric putter 20.

As shown in fig. 4, 5, 6 and 7, in the present embodiment, the footrest assembly 15 includes a first footrest 151 and a second footrest 152, the first footrest 151 is rotatably mounted on the seat frame 14, and the second footrest 152 is slidably mounted on the first footrest 151; more preferably, the first footrest 151 is mounted on the seat frame 14 through two second rotating shafts 37 which are bilaterally symmetrical and horizontally disposed, and rotates with the second rotating shafts 37 as a rotating center shaft, and the second rotating shafts 37 are fixedly connected with the second linkage frame 17;

more preferably, a concave arc-shaped bending part is arranged on the part of the sixth connecting rod 262 close to the footrest assembly 15; this is provided to enhance the structural strength of the sixth link 262 and to prevent the sixth link 262 from touching the second rotation shaft 37 during the rotation.

The third link mechanism 24 includes an eighth link 241 and a ninth link 242, the eighth link 241 is rotatably mounted on the first footrest 151, a rear end of the eighth link 241 is in transmission connection with the B end of the linkage assembly 25, a front end of the eighth link 241 is hinged to a rear end of the ninth link 242, a front end of the ninth link 242 is rotatably mounted on the second footrest 152, and further preferably, a distance between the front end of the eighth link 241 and a rotation center of the eighth link 241 is greater than a distance between the rear end of the eighth link 241 and the rotation center of the eighth link 241; this arrangement amplifies the sliding travel of the second footrest 152.

In the embodiment of the present application, a first rotating shaft 35 and a vertical third rotating shaft 36 are further provided, the first rotating shaft 35 is fixedly connected with the second linkage frame 17, and an included angle with the horizontal plane is not more than 30 degrees, the rear end of the eighth connecting rod 241 is installed on the third rotating shaft 36, the end a of the linkage assembly 25 of the third rotating shaft 36 is rotatably installed on the first rotating shaft 35, and the end a of the linkage assembly 25 is always located behind the second rotating shaft 37 in the rotating process; the end B of the linkage assembly 25 is rotatably mounted on the third rotating shaft 36; with this arrangement, the eighth link 241 is pulled to rotate by the distance difference generated by the eccentric rotation, and the second footrest 152 is slid forward by the ninth link 242.

More preferably, the first rotating shaft 35 and the second rotating shaft 37 are parallel to each other and are located behind the second rotating shaft 37.

Further preferably, a first ball 38 and a second ball 39 are further provided, wherein the first ball 38 is rotatably mounted on the first rotating shaft 35, the second ball 39 is rotatably mounted on the third rotating shaft 36, the a end of the linkage assembly 25 is rotatably mounted on the outer surface of the first ball 38, and the B end of the linkage assembly 25 is rotatably mounted on the outer surface of the second ball 39; this is provided to alleviate a difference in displacement in the up-down direction between the a end of the link assembly 25 and the B end of the link assembly 25.

Further preferably, the linkage assembly 25 includes a connecting rod 251 and two linkage members 252 rotatably sleeved at two ends of the connecting rod 251, the linkage members 252 include a ring body and a cylinder body which are integrally formed or fixedly connected, the cylinder body is provided with a connecting hole for the connecting rod 251 to be inserted, and the ring bodies of the two linkage members 252 are respectively rotatably sleeved on the first ball body 38 and the second ball body 39; this is provided to alleviate the angular difference generated by the two link members 252 rotating by different angles around the axis of the connecting rod 251.

Example two:

the difference between this embodiment and the first embodiment is: the first electric push rod is not arranged any more.

In the embodiment of the application, an air rod and a left spring and a right spring are arranged, wherein the installation mode of the air rod is the same as that and the installation structure of the first electric push rod in the first embodiment, the air rod and the first electric push rod are rotatably installed on a first linkage frame and a fixed seat, the front end of the spring is installed on the fixed seat, and the rear end of the spring is installed on a first connecting rod or the first linkage frame; further preferably, the spring is not in tension;

it is worth to be noted that, if the fixed seat is large enough, the rear end of the spring can be installed on the fixed seat, and the front end of the spring is installed on the first connecting rod or the first linkage frame; further preferably, the spring is not in a compressed state;

the arrangement is that the chair back frame can stay at any angle within a rotatable range and the chair seat frame can stay at any height within a liftable range through the air rod; the falling chair back frame is pushed to rotate upwards by the elasticity of the spring so as to help people get up.

Example three:

as shown in fig. 8 and 9, the present embodiment is different from the second embodiment in that: in the embodiment of the application, the second driving mechanism and the footrest assembly are not provided.

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 (10)

1. A chair comprises feet (11), a fixed seat (12), a chair back frame (13), a chair seat frame (14), a first linkage frame (16) and a second linkage frame (17), wherein the fixed seat (12) is installed on the feet (11), and the first linkage frame (16) and the bottom end of the chair back frame (13) are fixedly connected or integrally formed and rotatably installed on the fixed seat (12); the second linkage frame (17) is fixedly connected with the bottom surface of the chair seat frame (14) or integrally formed and movably arranged on the fixed seat (12); it is characterized by also comprising:

the left and right sets of first link mechanisms (22), the first link mechanisms (22) are arranged on the fixed seat (12), the first linkage frame (16) and the second linkage frame (17) and comprise a first connecting rod (221), a second connecting rod (222) and a third connecting rod (223) which are sequentially hinged, the top end of the first connecting rod (221) is rotatably arranged on the first linkage frame (16), the second connecting rod (222) is inverted V-shaped and is rotatably arranged on the side surface of the fixed seat (12) by taking a corner as a rotating circle center, and the top end of the third connecting rod (223) is rotatably arranged on the side surface of the second linkage frame (17);

the rear ends of the left and right fourth connecting rods (231) are hinged with the side surface of the fixed seat (12), and the front ends of the fourth connecting rods (231) are hinged with the side surface of the second linkage frame (17);

the top ends of the second limiting long holes (31) are positioned behind the bottom ends of the second limiting long holes (31);

the third linkage rod (32) is inserted into the second limiting long hole (31) and is in clearance fit with the second limiting long hole (31);

the telescopic device is used for driving the chair back frame (13) to tilt backwards and simultaneously driving the chair seat frame (14) to move backwards and upwards; and the driving device is used for driving the chair back frame (13) to rotate forwards and simultaneously driving the chair seat frame (14) to move forwards and downwards.

2. A chair as claimed in claim 1, wherein said telescopic means comprise a gas lever and at least one spring (40), the spring (40) being mounted at one end on the fixed base (12) and at the other end on the first connecting rod (221) or the first linkage (16); one end of the air rod is rotatably arranged on the fixed seat (12), and the other end of the air rod is rotatably arranged on the first linkage frame (16), the seat frame (14), the backrest frame (13) or the second linkage frame (17).

3. A chair according to claim 2, wherein when the front end of the spring (40) is mounted on the fixed base (12) and the rear end of the spring (40) is mounted on the first link (221) or the first linkage (16), the spring (40) is not in tension;

when the rear end of the spring (40) is arranged on the fixed seat (12), the front end of the spring (40) is arranged on the first connecting rod (221) or the first linkage frame (16), and the spring (40) is not in a compressed state.

4. A chair in accordance with claim 1, characterized in that the telescopic means is a first electric push rod (18).

5. The chair according to claim 1, wherein a left concave first limiting long hole (27) and a right concave first limiting long hole (27) are further provided, the first limiting long hole (27) is positioned on the side surface of the fixed seat (12) or the side surface of the second linkage frame (17), two sides of the first linkage frame (16) are hinged with the fixed seat (12), and the back frame (13) rotates by taking a straight line passing through two hinged points of the first linkage frame (16) and the fixed seat (12) as a rotating central shaft.

6. A chair according to claim 1, wherein the second restriction long hole (31) is linear, and the tip of the second restriction long hole (31) faces rearward.

7. A chair according to claim 1, wherein the second long restriction hole (31) is arc-shaped, and the top end of the second long restriction hole (31) is located behind the bottom end of the second long restriction hole (31).

8. A chair according to claim 1, characterized in that if two second limiting long holes (31) are respectively symmetrically arranged on two side surfaces of the fixed seat (12), the third linkage rod (32) is fixedly connected with the second linkage frame (17);

if two second limit long holes (31) are respectively and symmetrically arranged on two side faces of the second linkage frame (17), the third linkage rod (32) is fixedly connected with the fixed seat (12).

9. A chair in accordance with claim 1, wherein when the fourth link (231) is rotated upward with the rear end thereof as a rotation center to be parallel to a straight line passing through the top end of the second restriction long hole (31) and the bottom end of the second restriction long hole (31), the desired rotation angle is more than 90 degrees.

10. The chair as claimed in claim 1, wherein the body of the first connecting rod (221) is L-shaped, the horizontal section of the first connecting rod (221) extends forwards and downwards to form a first extending portion, the outer end of the first extending portion is hinged to the second connecting rod (222), the top end of the vertical section of the second connecting rod (222) is hinged to the first mounting plate (28), and the two ends of the first linkage rod (19) are fixedly connected to or integrally formed with the corners of the horizontal section and the vertical section of the first connecting rod (221).

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