CN114451716B - Chair - Google Patents

Abstract

The utility model discloses a chair, which comprises a seat frame, a leg rest plate, a back frame, an electric push rod, a linkage piece, a back frame adjusting piece and a leg rest plate adjusting piece, wherein the leg rest plate and the back frame are respectively hinged at two ends of the seat frame, the linkage piece is hinged on the seat frame, the electric push rod is used for driving the linkage piece to swing, the linkage piece respectively completes the linkage of the back frame and the leg rest plate through the back frame adjusting piece and the leg rest plate adjusting piece, and the back frame adjusting piece and the leg rest plate adjusting piece are respectively provided with a plurality of connecting seats which are sequentially hinged end to end, so that when the linkage piece drives the back frame adjusting piece and the leg rest plate adjusting piece to move, each connecting seat can swing in a small range, and can be regarded as an arc-shaped structure.

Description

Chair

Technical Field

The utility model relates to the field of home furnishing, in particular to a chair.

Background

At present, chairs in the market are various in variety and number, and because of more functions and components, the chairs after assembly and molding are generally large in size, and the processes of transportation and installation are inconvenient.

Patent document with publication number CN201420549191.2 discloses a linkage seat, which comprises a base, a support frame arranged on the base, a seat support, a chair back and foot pads, wherein the seat support is fixed on the support frame, the foot pads are hinged at the front end of the seat support, and the left side and the right side of the chair back are hinged on the support frame; the chair back is connected with the foot pad through a linkage mechanism, the linkage mechanism comprises a driving air rod, a first link rod, a second link rod and a third link rod, the front end part of the third link rod is hinged to the foot pad, the rear end part of the third link rod is hinged to the front end part of the second link rod, the rear end part of the second link rod is hinged to the support frame, the front end part of the first link rod is hinged to the second link rod, and the rear end part of the first link rod is hinged to the lower end of the chair back; the driving air rod is hinged on the supporting frame, and an output shaft of the driving air rod is coaxially hinged with the rear end part of the third link rod and the front end part of the second link rod.

In the prior art, the chair back and the foot pad are linked through the driving air rod, the first link rod, the second link rod and the third link rod, but the linkage mechanism, however, in the using process, the force born by the chair back is basically transferred to the second link rod through the first link rod, the force born by the second link rod part is born by the chair back, and the force born by the foot pad and the pneumatic push rod is born by the second link rod part, so that the requirements on high strength and position accuracy of the first link rod, the second link rod and the third link rod are met; the swing range of the back frame and the foot pad is completely dependent on the length of the connecting rod, so that the space required by the adjusting mechanism for realizing linkage between the chair back and the leg rest plate is larger, the size of the support frame is larger, the space utilization rate in the support frame is lower, the structure is looser, and the strength of the support frame is required to be higher.

Disclosure of Invention

In order to solve the problem that the space required by the adjusting mechanism for realizing linkage between the chair back and the leg rest in the prior art is large, the utility model aims to provide a chair, and the linkage part can drive the back frame and the leg rest respectively through two groups of connecting rod structures by installing the linkage part capable of swinging on the seat frame of the chair, and each group of connecting rod mechanisms consists of a plurality of connecting rods which are connected end to end in sequence, so that each connecting rod can rotate when the back frame and the leg rest are driven to adjust the angle, the space required by the adjusting mechanism for adjusting the angle of the leg rest and the leg rest is reduced through the structure, and the structure of the chair is more compact while the linkage of the back frame and the leg rest is completed.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the chair comprises a back frame, a seat frame, a leg rest plate, a base and an electric push rod, wherein the seat frame is arranged on the base, the back frame is hinged to one end of the seat frame, the leg rest plate is hinged to the other end of the seat frame, the chair also comprises a linkage piece, a back frame adjusting component and a leg rest plate adjusting component, the linkage piece is hinged to the seat frame, the electric push rod can drive the linkage piece to act, one end of the electric push rod is hinged to the seat frame, and the other end of the electric push rod is connected with the linkage piece; the back frame adjusting component comprises a first connecting seat, a second connecting seat and a third connecting seat, wherein the first connecting seat is fixedly connected with the linkage piece or integrally formed; the leg rest adjusting component comprises a fourth connecting seat, a fifth connecting seat, a sixth connecting seat and a seventh connecting seat, wherein two ends of the fourth connecting seat are respectively hinged with the linkage piece and the fifth connecting seat, the fifth connecting seat is also hinged with the seat frame, two ends of the sixth connecting seat are respectively hinged with the fifth connecting seat and the seventh connecting seat, and the seventh connecting seat is connected with the leg rest. The device is arranged in such a way that the linkage of the back frame and the leg rest is completed through the linkage piece, the back frame adjusting component and the leg rest adjusting component; the back frame adjusting assembly and the leg rest adjusting assembly are respectively provided with a plurality of connecting seats which are sequentially hinged end to end, so that when the linkage piece drives the back frame adjusting assembly and the leg rest adjusting assembly to move, each connecting seat can swing in a small range, and can be regarded as an arc-shaped structure, and the back frame adjusting assembly and the leg rest adjusting assembly are different from a single connecting rod for driving; the second connecting seat is additionally arranged between the first connecting seat and the back frame, and the sixth connecting seat is additionally arranged between the fifth connecting seat and the leg rest, so that when transition adjustment occurs on the back frame or the leg rest, the second connecting seat can continuously rotate relative to the back frame, the sixth connecting seat can continuously rotate relative to the leg rest, and the problem that the operation of the chair is stable when the electric push rod is in transition adjustment is avoided; a stable four-bar mechanism is formed among the fifth connecting seat, the fourth connecting seat, the linkage piece and the seat frame, so that the movement process is more stable.

Preferably, the electric push rod and the leg rest plate adjusting assembly are arranged side by side. In this way, the chair mechanism can be made more compact.

Preferably, one end of the electric push rod is hinged with the seat frame, and the other end of the electric push rod is hinged with the first connecting seat. In this way, the structure in the seat frame is more compact.

Preferably, the first connecting seat and the second connecting seat are connected through a third hinge shaft, a torsion spring for enabling the second connecting seat to overturn upwards is sleeved on the third hinge shaft, one supporting leg of the torsion spring is abutted against the first connecting seat, and the other supporting leg of the torsion spring is abutted against the second connecting seat. So set up, because two stabilizer blades of torsional spring offset with the bottom of first connecting seat and second connecting seat respectively for the user is behind the angle of confirming back of the body frame, and the back of the body frame still can take place the swing of small circle, can improve user's use like this and experience.

Preferably, the fourth connecting seat is hinged with the fifth connecting seat through a sixth hinge shaft, the fifth connecting seat is hinged with the seat frame through a seventh hinge shaft, the fifth connecting seat is hinged with the sixth connecting seat through an eighth hinge shaft, and the distance from the seventh hinge shaft to the sixth hinge shaft is smaller than the distance from the seventh hinge shaft to the eighth hinge shaft. By this arrangement, the swing range of the leg rest can be increased by the distance between the respective hinge shafts.

Preferably, the leg rest comprises a tension spring which can promote the leg rest to be close to the seventh connecting seat, one end of the tension spring is connected with the seventh connecting seat, and the other end of the tension spring is connected with the leg rest. So set up, make leg rest board adjust more nimble.

Preferably, the seat frame comprises a bottom plate, a seat plate, two support plates and a plurality of connecting plates, wherein the two support plates are symmetrically arranged in the left-right direction and are fixedly connected through the plurality of connecting plates, the seat plate and the bottom plate are both positioned between the two support plates, the seat plate is positioned above the bottom plate, the bottom plate is fixed on the connecting plates, and the two support plates are both fixedly connected with the seat plate; the fifth connecting seat is hinged with the bottom plate, the two supporting plates are hinged with the back frame and the leg rest plate, and the supporting plates are used for connecting and supporting the back frame. Thus, the chair is convenient to manufacture and install.

Preferably, two bayonets are formed in the top of the supporting plate, a first limiting column is mounted on the back frame, and when the back frame tilts forward to the maximum angle, the first limiting column can enter the bayonets and is propped against the bayonets. Thus, when the back frame is tilted forwards to the maximum angle, the back frame can be used for supporting the back frame, the burden of the back frame adjusting assembly and the joint of the back frame and the seat frame is reduced, and the service life of the chair is prolonged.

Preferably, the back frame comprises a track frame and a massage machine core arranged on the track frame, the track frame is hinged with the seat frame, and the massage machine core can reciprocate along the track frame to massage the back of the user. In this way, a better experience can be provided for the user.

The technical scheme of the utility model has the beneficial effects that: 1. in the scheme, the linkage of the back frame and the leg rest plate is completed through the linkage piece, the back frame adjusting assembly and the leg rest plate adjusting assembly; the back frame adjusting assembly and the leg rest adjusting assembly are respectively provided with a plurality of connecting seats which are sequentially hinged end to end, so that when the linkage piece drives the back frame adjusting assembly and the leg rest adjusting assembly to move, each connecting seat can swing in a small range, and can be regarded as an arc-shaped structure, and the back frame adjusting assembly and the leg rest adjusting assembly are different from a single connecting rod for driving; 2. the second connecting seat is additionally arranged between the first connecting seat and the back frame, and the sixth connecting seat is additionally arranged between the fifth connecting seat and the leg rest, so that when transition adjustment occurs on the back frame or the leg rest, the second connecting seat can continuously rotate relative to the back frame, and the sixth connecting seat can continuously rotate relative to the leg rest, thereby ensuring the stable operation of the chair; 3. because the two support legs of the torsion spring are respectively propped against the bottoms of the first connecting seat and the second connecting seat, the back frame can still swing in a small range after a user determines the angle of the back frame, so that the use experience of the user can be improved; 4. the structural design of the seat frame not only adopts the scheme of manufacturing and assembling, but also provides support for the back frame, thereby reducing the fatigue of the back frame connecting piece and the joint of the back frame and the seat frame and prolonging the service life of the chair; 5. in the scheme, the distance from the seventh hinge shaft to the sixth hinge shaft is smaller than the distance from the seventh hinge shaft to the eighth hinge shaft, so that the swing range of the leg rest plate is increased while the compact structure is ensured, and the requirements of the chair for storage, transportation and the like are met; 6. the leg rest plate and the seventh connecting seat are attached through the tension springs, so that the installation and the manufacture are convenient, the flexibility of adjusting the leg rest plate is improved, and the stability of the chair is improved.

Drawings

FIG. 1 is a schematic view of a chair with an outer cover attached;

FIG. 2 is a schematic diagram of a chair;

FIG. 3 is a schematic view of a chair with a seat plate removed;

FIG. 4 is a schematic view of the seat frame, back frame, leg rest and adjustment mechanism;

FIG. 5 is a schematic diagram II of the structure of the seat frame, back frame, leg rest and adjustment mechanism;

FIG. 6 is a schematic structural view of a linkage, leg rest adjustment assembly, and back frame adjustment assembly;

fig. 7 is a schematic view of the connection structure of the seat frame and the base.

Reference numerals:

1. a back frame; 11. a track frame; 12. massage movement; 13. a first limiting plate; 14. a first limit post;

2. a mounting; 21. a bottom plate; 22. a seat plate; 23. a support plate; 231. a bayonet;

3. leg rest board; 31. a mounting plate; 311. a guide part;

4. a base; 41. supporting feet; 42. an air bar; 44. a limit sleeve; 45. the second limit column;

5. a back frame adjusting assembly; 51. a first connection base; 52. a third hinge shaft; 53. a second connecting seat; 54. a fourth hinge shaft;

55. a third connecting seat; 56. a torsion spring;

6. leg rest adjustment assembly; 61. a fourth connecting seat; 62. a fifth hinge shaft; 63. a sixth hinge shaft; 64. a fifth connecting seat;

65. a seventh hinge shaft; 66. an eighth hinge shaft; 67. a sixth connecting seat; 68. a ninth hinge shaft; 69. a seventh connecting seat;

60. a tenth hinge shaft; 601. a tension spring;

71. an electric push rod; 72. and a linkage plate.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

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

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In an embodiment of the present utility model,

as shown in fig. 1 to 3, a chair comprises a seat frame 2, a back frame 1, a base 4, a leg rest 3 and an adjusting mechanism for adjusting the leg rest and the back frame, wherein the seat frame 2 is arranged on the base 4, the back frame 1 is hinged with the rear end of the seat frame 2 through a first hinge shaft, the leg rest 3 is hinged with the front end of the seat frame 2 through a second hinge shaft, the adjusting mechanism comprises an electric push rod 71, a linkage piece, a back frame adjusting component 5 and a leg rest adjusting component 6, the linkage piece is hinged on the seat frame 2, one end of the electric push rod 71 is hinged on the seat frame 2, the electric push rod 71 comprises a driving part for driving the adjusting mechanism to move, and the driving part of the electric push rod 71 is hinged with the linkage piece.

As shown in fig. 2 to 6, in the present embodiment, the link member includes a link plate 72 and a plurality of connection lugs fixedly mounted on the mount 2, respectively, the connection lugs mounted on the mount 2 corresponding to and hinge with part of the connection lugs mounted on the link plate 72. Thus, the chair is convenient to assemble.

In this embodiment, the adjusting mechanism includes a back frame adjusting component 5, the back frame adjusting component 5 includes a first connecting seat 51, a second connecting seat 53 and a third connecting seat 55, the first connecting seat 51 is fixedly connected with or integrally formed with a linkage plate 72, the first connecting seat 51 is hinged with the second connecting seat 53 through a third hinge shaft 52, the second connecting seat 53 is hinged with the third connecting seat 55 through a fourth hinge shaft 54, the third connecting seat 55 is fixedly connected with or integrally formed with the back frame 1, a torsion spring 56 for urging the second connecting seat 53 to overturn upwards is sleeved on the third hinge shaft 52, one leg of the torsion spring 56 abuts against the first connecting seat 51, the other leg of the torsion spring 56 abuts against the second connecting seat 53, the driving end of the electric push rod 71 is hinged with the first connecting seat 51, and the electric push rod 71 is hinged with the seat frame 2; thus, in the normal folding and storage process of the back frame 1, the electric push rod 71 drives the first connecting seat 51 to swing through the driving linkage plate 72, the first connecting seat 51 pushes the second connecting seat 53 through the third hinge shaft 52, the second connecting seat 53 pushes the third connecting seat 55 through the fourth hinge shaft 54, and the third connecting seat 55 pushes the back frame 1, so that the back frame 1 rotates around the first hinge shaft. The torsion spring 56 is configured to ensure smooth operation of the mechanism, and normally, when the first connecting seat 51 swings backwards, the top of the back frame 1 is driven to topple forwards by the second connecting seat 53 and the third connecting seat 55 so as to realize folding; because the space of the seat frame 2 is limited, in a narrow space, the heights of the first connecting seat 51 and the third connecting seat 55 are similar, which results in that the heights of the third hinging shaft 52 and the fourth hinging shaft 54 are similar, when the force required by the back frame 1 to rotate is large due to the conditions of assembly or long-term use, etc., the second connecting seat 53 cannot push the third connecting seat 55 backwards, which results in that the positions of the third hinging shaft 52 and the second connecting seat 53 move downwards, which results in that the second connecting seat 53 pulls the bottom of the back frame 1 forwards through the fourth hinging shaft 54, so that the back frame 1 is further unfolded, and the method is contrary to the original scheme; the torsion spring 56 is arranged to counteract the force of the first hinge shaft 52 pressing down the torsion spring and the second connecting seat 53, so as to ensure the correct movement direction of the back frame 1.

In this embodiment, the adjusting mechanism includes a leg rest adjusting assembly 6 including a fourth connecting seat 61, a fifth connecting seat 64, a sixth connecting seat 67, a seventh connecting seat 69, and a tension spring 601 capable of urging the leg rest (3) to close to the seventh connecting seat (69), the bottom of the fifth connecting seat 64 is hinged to the seat frame 2 through a seventh hinge shaft 65, one end of the fourth connecting seat 61 is hinged to the linkage plate 72 through a fifth hinge shaft 62, and the other end of the fourth connecting seat 61 is hinged to the fifth connecting seat 64 through a sixth hinge shaft 63; the fifth connecting seat 64 is hinged with one end of the sixth connecting seat 67 through the eighth hinging shaft 66, the other end of the sixth connecting seat 67 is hinged with the seventh connecting seat 69 through the ninth hinging shaft 68, the seventh connecting seat 69 is hinged with the leg rest plate 3 through the tenth hinging shaft 60, one end of the tension spring 601 is hooked on the seventh connecting seat 69, and the other end of the tension spring 601 is hooked on the leg rest plate 3. Thus, according to the scheme, the leg rest plate 3 and the chair back 1 can be linked, and the folding and unfolding of the chair can be realized. Further, the spacing between the eighth hinge shaft 66 and the ninth hinge shaft 68 is greater than the spacing between the ninth hinge shaft 68 and the tenth hinge shaft 60. So set up, can realize the quick lifting of leg rest board.

In this embodiment, the position where the third connecting seat 55 is connected to the back frame 1 is lower than the position where the first hinge shaft is located, and the ninth hinge shaft 68 and the tenth hinge shaft 60 are located below the second hinge shaft. In the folded state of the chair, the top of the back frame 1 is tilted forwards, the bottom of the back frame 1 is tilted backwards, and the bottom of the leg rest plate 3 is tilted backwards. According to the scheme, through the arrangement of the torsion spring 601, certain support can be provided for the back frame 1 on one hand, and on the other hand, when the back frame 1 and the seat frame 2 are fixed in angle and the back frame 1 receives excessive external force, the torsion spring 56 can provide certain buffer, the first connecting seat 51 and the second connecting seat 53 can swing in a small amplitude, and rigid collision among all parts is avoided. The difference is that the leg rest is reset by pushing or pulling the leg rest between the connecting rods in the traditional scheme, in the embodiment, the stress position of the leg rest is changed during reset through the arrangement of the tension springs 601, so that the leg rest can be unfolded and reset more smoothly.

In this embodiment, the height of the connection position between the third connection seat 55 and the back frame 1 is lower than the height of the position of the first hinge shaft.

In this embodiment, the driving part of the electric push rod 71 is hinged to the first connection seat 51. In this way, the overall structure of the chair can be simplified.

In this embodiment, the tension spring 601 is always in a state of tensile stress. Thus, the maximum folding angle of the leg rest plate can be ensured,

in the present embodiment, the distance from the seventh hinge shaft 65 to the sixth hinge shaft 63 is smaller than the distance from the seventh hinge shaft 65 to the eighth hinge shaft 66. Therefore, the whole structure and the size are simplified, and the back frame can be overturned more smoothly.

In this embodiment, the leg rest 3 is hinged to the front end of the seat frame 2 through a mounting plate 31, the mounting plate 31 is fixedly mounted on the rear side of the leg rest 3, the mounting plate comprises two first connecting parts and two second connecting parts, the two first connecting parts are formed by bending backwards, the second connecting parts are located between the first connecting parts, the seventh connecting seat 69 is hinged to the second connecting parts through a tenth hinge shaft 60, and the two first connecting parts are respectively hinged to the left end and the right end of the seat frame 2 through second hinge shafts; the mounting plate 31 further comprises a guide part 311 extending downwards, and one end of a tension spring 601 is hooked on the guide part 311 of the mounting plate 31; the guide part 311 is provided with a containing groove, and the tension spring 601 can freely enter and exit the containing groove; the guide part 311 is provided with a second through hole, the second through hole is positioned at the lower side of the accommodating groove, and the other end of the tension spring 301 is hooked on the guide part 311 through the second through hole; a first through hole is formed in the bottom of the seventh connecting seat 69, and one end of the tension spring 601 is hooked on the seventh connecting seat 69 through the first through hole.

In this embodiment, the back frame 1 is provided with a massage machine core 12 and a rail frame 11, the massage machine core 12 is arranged on the rail frame 11 and the massage machine core 12 reciprocates along the rail frame 11. Thus, the massage can be carried out during rest, so that the human body is more relaxed.

As shown in fig. 7, in this embodiment, the seat frame 2 includes a bottom plate 21, a seat plate 22, two support plates 23 and a plurality of connection plates, the two support plates 23 are symmetrically arranged in the left-right direction, the two support plates 23 are fixedly connected through the plurality of connection plates, the seat plate 22 and the bottom plate 21 are both located between the two support plates 23, the seat plate 22 is located above the bottom plate 21, the bottom plate 21 is fixed on the connection plates, and the two support plates 23 are both fixedly connected with the seat plate 22; the linkage, the back frame adjusting component 5 and the leg rest adjusting component 6 are all connected with the bottom plate 21, the two supporting plates 23 are all hinged with the back frame 1 and the leg rest 3, the supporting plates 23 are used for connecting and supporting the back frame 1, and the five connecting seats 64 are hinged with the bottom plate 21 through seventh hinge shafts 65. Thus, the overall weight of the chair can be reduced, and the chair can be manufactured and manufactured separately. Further, the back frame 1, the seat frame 2 and the leg rest plate 3 are all covered with outer covering pieces for isolating the human body; the outer cover may be a soft pack, a bandage, or the like. In this way, a more comfortable experience may be provided for the user.

In this embodiment, the left and right sides of the back frame 1 are fixedly provided with first limiting plates 13, the first limiting plates 13 are fixedly provided with first limiting columns 14, the top of the supporting plate 23 is provided with two bayonets 231, the back frame 7 is provided with first limiting columns 14, and when the back frame 1 tilts forward to the maximum angle, the first limiting columns 14 can enter the bayonets 14 and mutually collide with each other; when the top of the back frame 1 swings forwards, the back frame 1 drives the first limiting post 14 to swing forwards through the first limiting plate 13, and the first limiting post 14 swings forwards gradually to enter the bayonet 231 until abutting against the inner side wall of the bayonet 231. In this way, on the one hand, the range of the swing of the back frame 1 can be limited, and on the other hand, more support is provided for the back frame 1 in the folded state, so that fatigue can be effectively prevented. Further, the first limiting plate 133 is hinged to the adjacent supporting plate 23 through a first hinge shaft, and the first hinge shaft is located below the rear side of the bayonet 231.

In this embodiment, the base 4 includes a supporting leg 41, an air rod 42, a second limiting post 45 and a limiting sleeve 44, the bottom of the air rod 43 is fixedly mounted on the supporting leg 41, a piston rod of the air rod 42 is connected with the bottom plate 21 of the seat frame 2, the limiting sleeve 44 is sleeved on a cylinder barrel of the air rod 42 and is fixedly connected with the cylinder barrel, a limiting groove is formed in the top of the limiting sleeve 44, the second limiting post 45 is fixedly mounted on the bottom plate 21 at the bottom of the seat frame 2, and the second limiting post 45 extends downwards into the limiting groove. Therefore, the rotation range of the chair can be easily limited, the use safety is ensured, and more use experience can be provided for users. Further, the supporting legs 41 are four-star legs, five-star legs, discs or the like.

The unfolding process of the chair comprises the following steps: the electric push rod 71 is started and pulls the first connecting seat 51 forwards, the first connecting seat 51 drives the linkage plate 72 to overturn forwards, the first connecting seat 51 pulls the second connecting seat 53 forwards through the third hinge shaft 52, the second connecting seat 53 pulls the third connecting seat 55 forwards through the fourth hinge shaft 54, the third connecting seat 55 pulls the bottom of the back frame 1 forwards, the back frame 1 rotates around the first hinge shaft, in the process of rotating the back frame 1, the top of the back frame 1 gradually overturns backwards, and the bottom of the back frame 1 gradually overturns forwards; the linkage plate 72 pushes the fourth connecting seat 61 forward through the fifth hinge shaft 62, the fourth connecting seat 61 pushes the fifth connecting seat 64 to rotate around the seventh hinge shaft 65 through the sixth hinge shaft 63, the fifth connecting seat 64 turns over from back to front, the fifth connecting seat 64 pushes the sixth connecting seat 67 forward through the eighth hinge shaft 66, the sixth connecting seat 67 pushes the seventh connecting seat 69 forward through the ninth hinge shaft 68, the seventh connecting seat 69 pushes the leg rest plate 3, and the seventh connecting seat 69 pushes the leg rest plate 3 to rotate around the second hinge shaft because the ninth hinge shaft 68 is lower than the second hinge shaft; when the leg rest 3 and the back frame 1 are adjusted to a proper angle, the electric push rod 71 stops working, and the unfolding of the chair is completed. In the process, the seventh connecting seat 69 is always abutted against the leg rest 3.

A folding process of a chair comprises the following steps: the electric push rod 71 is started and pushes the first connecting seat 51 backwards, the first connecting seat 51 drives the linkage plate 72 to turn backwards, the first connecting seat 51 pushes the second connecting seat 53 backwards through the third hinge shaft 52, the second connecting seat 53 pushes the third connecting seat 55 backwards through the fourth hinge shaft 54, the third connecting seat 55 pushes the bottom of the back frame 1 backwards, the back frame 1 rotates around the first hinge shaft, in the process of rotating the back frame 1, the top of the back frame 1 gradually turns forwards, and the bottom of the back frame 1 gradually turns backwards; the linkage plate 72 pulls the fourth connecting seat 61 backwards through the fifth hinging shaft 62, the fourth connecting seat 61 pulls the fifth connecting seat 64 to rotate around the seventh hinging shaft 65 through the sixth hinging shaft 63, the fifth connecting seat 64 turns over from front to back, the fifth connecting seat 64 pulls the sixth connecting seat 67 backwards through the eighth hinging shaft 66, the sixth connecting seat 67 pulls the seventh connecting seat 69 backwards through the ninth hinging shaft 68, the seventh connecting seat 69 rotates around the tenth hinging shaft 60, the bottom of the seventh connecting seat 69 rotates from front to back, at the moment, the seventh connecting seat 69 is not in contact with the leg rest plate 3 any more, the length of the tension spring 3 changes, the tension spring 3 pulls the bottom of the leg rest plate 3 to rotate around the second hinging shaft until the leg rest plate 3 is in contact with the seventh connecting seat 69; when the leg rest 3 and the back frame 1 are folded to a proper angle, the electric push rod 71 stops working, thereby completing the folding of the chair.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.

Claims (9)

1. The utility model provides a chair, includes back of body frame (1), seat frame (2), leg rest board (3), base (4) and electric putter (71), and seat frame (2) are installed on base (4), and back of body frame (1) are articulated to be installed in seat frame (2) one end, and leg rest board (3) are articulated to be installed at seat frame (2) other end, its characterized in that: the electric leg rest comprises a seat frame (2), and is characterized by further comprising a linkage piece, a back frame adjusting assembly (5) and a leg rest plate adjusting assembly (6), wherein the linkage piece is hinged to the seat frame (2), an electric push rod (71) can drive the linkage piece to act, one end of the electric push rod (71) is hinged to the seat frame (2), and the other end of the electric push rod (71) is hinged to the linkage piece;

the back frame adjusting component (5) comprises a first connecting seat (51), a second connecting seat (53) and a third connecting seat (55), wherein the first connecting seat (51) is fixedly connected with the linkage piece or integrally formed, two ends of the second connecting seat (53) are respectively hinged with the first connecting seat (51) and the third connecting seat (55), and the third connecting seat (55) is fixedly connected with the back frame or integrally formed;

the leg rest adjusting assembly (6) comprises a fourth connecting seat (61), a fifth connecting seat (64), a sixth connecting seat (67) and a seventh connecting seat (69), wherein two ends of the fourth connecting seat (61) are respectively hinged with the linkage piece and the fifth connecting seat (64), the fifth connecting seat (64) is also hinged with the seat frame (2), two ends of the sixth connecting seat (67) are respectively hinged with the fifth connecting seat (64) and the seventh connecting seat (69), and the seventh connecting seat (69) is connected with the leg rest (3).

2. A chair according to claim 1, wherein: the electric push rod (71) and the leg rest plate adjusting component (6) are arranged side by side.

3. A chair according to claim 1, wherein: one end of the electric push rod (71) is hinged with the seat frame (2), and the other end of the electric push rod (71) is hinged with the first connecting seat (51).

4. A chair according to claim 1, wherein: the first connecting seat (51) and the second connecting seat (53) are connected through a third hinge shaft (52), a torsion spring (56) for enabling the second connecting seat (53) to overturn upwards is sleeved on the third hinge shaft (52), one supporting leg of the torsion spring (56) is abutted against the first connecting seat (51), and the other supporting leg of the torsion spring (56) is abutted against the second connecting seat (53).

5. A chair according to claim 1, wherein: the fourth connecting seat (61) is hinged with the fifth connecting seat (64) through a sixth hinging shaft (63), the fifth connecting seat (64) is hinged with the seat frame (2) through a seventh hinging shaft (65), the fifth connecting seat (64) is hinged with the sixth connecting seat (67) through an eighth hinging shaft (66), and the distance from the seventh hinging shaft (65) to the sixth hinging shaft (63) is smaller than the distance from the seventh hinging shaft (65) to the eighth hinging shaft (66).

6. A chair according to claim 1, wherein: the leg rest comprises a leg rest body, a seventh connecting seat (69) and a tension spring (601) capable of promoting the leg rest body (3) to be close to the seventh connecting seat (69), one end of the tension spring (601) is connected with the seventh connecting seat (69), and the other end of the tension spring (601) is connected with the leg rest body (3).

7. A chair according to claim 1, wherein: the seat frame (2) comprises a bottom plate (21), a seat plate (22), two support plates (23) and a plurality of connecting plates, wherein the two support plates (23) are symmetrically arranged in the left-right direction, the two support plates (23) are fixedly connected through the plurality of connecting plates, the seat plate (22) and the bottom plate (21) are both positioned between the two support plates (23), the seat plate (22) is positioned above the bottom plate (21), the bottom plate (21) is fixed on the connecting plates, and the two support plates (23) are both fixedly connected with the seat plate (22); the fifth connecting seat (64) is hinged with the bottom plate (21), the two supporting plates (23) are both hinged with the back frame (1) and the leg rest plate (3), and the supporting plates (23) are used for connecting and supporting the back frame (1).

8. A chair according to claim 7, wherein: two bayonets (231) have been seted up at the top of backup pad (23), install first spacing post (14) on back of the body frame (7), when back of the body frame (1) forward lean to the biggest angle, first spacing post (14) can get into bayonet socket (14) in and both offset.

9. A chair according to claim 1, wherein: the back frame (1) comprises a track frame (11) and a massage machine core (12) arranged on the track frame (11), the track frame (11) is hinged with the seat frame (2), and the massage machine core (12) can reciprocate along the track frame (11) to massage the back of a user.