CN217137290U - Chair and leg rest plate adjusting mechanism thereof - Google Patents

Abstract

The utility model discloses a chair and put leg board adjustment mechanism thereof, including the seat frame, put leg board and electric putter, put the leg board and articulate in seat frame one end, the fifth connecting seat, sixth connecting seat and seventh connecting seat, the fifth connecting seat is articulated with the seat frame, electric putter is connected and can drive the swing of fifth connecting seat with the fifth connecting seat, the one end of sixth connecting seat is articulated through eighth articulated shaft and fifth connecting seat, the other end of sixth connecting seat is articulated through ninth articulated shaft and seventh connecting seat, the seventh connecting seat is articulated through tenth articulated shaft and leg board, interval between eighth articulated shaft and the ninth articulated shaft is greater than the interval between ninth articulated shaft and the tenth articulated shaft. Like this, even when electric putter's adjusting position is greater than the extreme position of putting the leg board, can both take place to rotate between fifth connecting seat and the sixth connecting seat to offset the unnecessary stroke of electric putter, and then guarantee the steady operation of mechanism, and can realize putting the quick lifting of leg board.

Description

Chair and leg rest plate adjusting mechanism thereof

Technical Field

The utility model relates to a house field especially relates to a chair and put leg board adjustment mechanism thereof.

Background

At present, the variety and the quantity of chairs are various in the market, and because function and subassembly are more, the general size of chair after the equipment shaping is on the large side, and is transporting, the process of installation all comparatively inconvenient.

Patent document No. CN202020038767.4 discloses a chair with footrest, which includes feet, a fixed seat, a back frame, a seat frame, a footrest assembly, a first linkage frame and a second linkage frame, wherein the fixed seat is fixedly connected with the feet, and the first linkage frame is fixedly connected with the bottom end of the back frame or is integrally formed and rotatably mounted 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 footrest component is rotatably arranged on the second linkage frame or the chair seat frame and also comprises a second driving mechanism which is used for driving the footrest component to rotate so as to lift and put down the footrest component, and the footrest component extends in the lifting process of the footrest component and shortens in the putting process of the footrest component. The second driving mechanism comprises a second electric push rod, a second linkage rod, a third link mechanism, a linkage assembly and a left set and a right set of second link mechanisms, the second link mechanisms are arranged on the second linkage frame and the footrest assembly, the third link mechanism is arranged on the footrest assembly, the linkage assembly is rotatably arranged on the chair seat frame and is connected with the third link mechanism, the second linkage rod is fixedly connected with the second link mechanism or integrally formed with the second link mechanism, the rear end of the second electric push rod is hinged with the second linkage frame, the front end of the second electric push rod is hinged with the second linkage rod, and when the second electric push rod extends, the footrest assembly is lifted up through the second link mechanism, and in the process of lifting the footrest assembly, the third link mechanism is simultaneously driven by the linkage assembly to operate so as to extend the footrest assembly; when the second electric push rod shortens, make the footrest subassembly put down through second link mechanism to in-process that the footrest subassembly was put down drives the operation of third link mechanism simultaneously through the linkage subassembly and so that the footrest subassembly shortens.

In the prior art, the swing of the footrest is generally completed by driving a link mechanism through an electric push rod or the electric push rod is directly hinged with the footrest, but the speed of the swing of the footrest is slower.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the leg placing plate is lifted slowly, the utility model aims to provide a chair and leg placing plate adjustment mechanism thereof makes the leg placing plate lift fast through adjusting the interval between each connecting seat tie point in the leg placing plate adjusting part, improves user's use and experiences.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a leg placing plate adjusting mechanism comprises a seat frame, a leg placing plate and an electric push rod, wherein the leg placing plate is hinged to one end of the seat frame, a fifth connecting seat, a sixth connecting seat and a seventh connecting seat are hinged to the seat frame, the electric push rod is connected with the fifth connecting seat and can drive the fifth connecting seat to swing, one end of the sixth connecting seat is hinged to the fifth connecting seat through an eighth hinge shaft, the other end of the sixth connecting seat is hinged to the seventh connecting seat through a ninth hinge shaft, the seventh connecting seat is hinged to the leg placing plate through a tenth hinge shaft, and the distance between the eighth hinge shaft and the ninth hinge shaft is larger than the distance between the ninth hinge shaft and the tenth hinge shaft; the leg placing plate is connected with the seventh connecting seat through a connecting rod, and the other end of the leg placing plate is connected with the seventh connecting seat. Like this, even when electric putter's adjusting position was greater than the extreme position of putting the leg board, can both take place to rotate between fifth connecting seat and the sixth connecting seat to offset the unnecessary journey of electric putter, and then guarantee the steady operation of mechanism, and can realize putting the quick lifting of leg board.

Preferably, the electric push rod mechanism further comprises a linkage piece, the linkage piece is hinged to the seat frame, one end of the electric push rod is hinged to the seat frame, the other end of the electric push rod is hinged to the linkage piece, the electric push rod drives the fifth connecting seat to swing through the linkage piece, and the electric push rod and the fifth connecting seat are arranged side by side in the left-right direction. So set up for the structure is compacter.

Preferably, the connecting device further comprises a fourth connecting seat, the linkage part is connected with the fifth connecting seat through the fourth connecting seat, one end of the fourth connecting seat is hinged to the linkage part, the other end of the fourth connecting seat is hinged to the fifth connecting seat through a sixth hinged shaft, the fifth connecting seat is hinged to the seat frame through a seventh hinged shaft, and the fifth connecting seat is hinged to the sixth connecting seat through an eighth hinged shaft. Like this, be convenient for drive fifth connecting seat for adjustment mechanism's operation is more stable.

Preferably, a distance from the seventh hinge shaft to the sixth hinge shaft is less than a distance from the seventh hinge shaft to the eighth hinge shaft. Thus, the swing range of the leg rest can be enlarged.

Preferably, the tension spring is always in a tension state. Like this, can guarantee to offset all the time between seventh connecting seat and the leg rest board for the action scope of leg rest board is bigger.

Preferably, the leg rest plate is hinged to the seat frame through a second hinge shaft, the seventh connecting seat is hinged to the leg rest plate through a tenth hinge shaft, and the height of the second hinge shaft is higher than that of the tenth hinge shaft. Thus, the stability of the operation of the mechanism is ensured.

Preferably, the leg placing plate is hinged to the front end of the seat frame through a mounting plate and is fixedly connected with the mounting plate; the mounting panel includes two first connecting portions and two second connecting portions of backward bending type, and the second connecting portion are located between first connecting portion, and first connecting portion are articulated with the seat frame, and the second connecting portion are articulated with seventh connecting seat, and the other end of extension spring is connected on the mounting panel.

A chair comprises the leg rest plate adjusting mechanism.

The technical scheme of the utility model beneficial effect does: 1. a sixth connecting seat is additionally arranged between the fifth connecting seat and the leg placing plate, and even if the adjusting position of the electric push rod is larger than the limit position of the leg placing plate, the fifth connecting seat and the sixth connecting seat can rotate, so that redundant stroke of the electric push rod is offset, and stable operation of the mechanism is further ensured; 2. a tension spring is additionally arranged between the seventh connecting seat and the leg placing plate, so that the adjusting process of the mechanism is more flexible; 3. the structure is more compact when the swing range of the leg placing plate is enlarged by changing the connecting positions of the fourth connecting seat and the sixth connecting seat on the fifth connecting seat; 3. through making the interval between eighth articulated shaft and the ninth articulated shaft be greater than the interval between ninth articulated shaft and the tenth articulated shaft, realize putting the quick lifting of leg board, improve user's use and experience.

Drawings

FIG. 1 is a first schematic view of a chair (with an outer covering installed);

FIG. 2 is a second schematic structural view of a chair;

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

FIG. 4 is a first structural view of the seat frame, the back frame, the leg rest and the adjusting mechanism;

FIG. 5 is a second schematic structural view of the seat frame, the back frame, the leg rest and the adjusting mechanism;

FIG. 6 is a schematic view showing a connection structure of the seat frame, the leg rest and the adjustment mechanism;

FIG. 7 is a schematic view of a connecting structure of the link member and the leg rest adjusting assembly;

fig. 8 is a schematic view of a connection structure of the seat frame and the base.

Reference numerals:

1. a back frame; 11. a rail frame; 12. a massage machine core; 13. a first limit plate; 14. a first limit post;

2. a seat frame; 21. a base plate; 22. a seat plate; 23. a support plate; 231. a bayonet;

3. a leg rest plate; 31. mounting a plate; 311. a guide portion;

4. a base; 41. supporting legs; 42. a gas lever; 44. a limiting sleeve; 45. a second limit post;

5. a back frame adjustment assembly; 51. a first connecting seat; 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. a leg rest plate 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. a linkage 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 to implicitly indicate 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. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the embodiment of the method, the first step,

as shown in fig. 1 to 3, a chair comprises a seat frame 2, a back frame 1, a base 4, a leg placing plate 3 and an adjusting mechanism for adjusting the leg placing plate and the back frame, wherein the seat frame 2 is installed 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 placing plate 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 placing plate adjusting component 6, the linkage piece is hinged and installed on the seat frame 2, one end of the electric push rod 71 is hinged and installed 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 and connected with the linkage piece.

As shown in fig. 2 to 6, in the present embodiment, the linkage member includes a linkage plate 72 and a plurality of connection lugs, the connection lugs are respectively and fixedly installed on the seat frame 2, and the connection lugs installed on the seat frame 2 correspond to and are hinged to part of the connection lugs installed on the linkage plate 72. Thus, the assembly of the chair is facilitated.

In this embodiment, the adjusting mechanism includes a back frame adjusting assembly 5, the back frame adjusting assembly 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 turn 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, a 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; like this, in the normal folding in-process of accomodating of back of the body frame 1, electric putter 71 drives first connecting seat 51 swing through drive linkage plate 72, and first connecting seat 51 pushes away second connecting seat 53 through third articulated shaft 52, and second connecting seat 53 pushes up third connecting seat 55 through fourth articulated shaft 54, and third connecting seat 55 pushes away back of the body frame 1 for back of the body frame 1 rotates around first articulated shaft department. The torsion spring 56 is arranged to ensure the smooth operation of the mechanism, and under normal conditions, when the first connecting seat 51 swings backwards, the top of the back frame 1 is driven to tilt forwards through the second connecting seat 53 and the third connecting seat 55 so as to realize folding; because the seat frame 2 has limited space, the first connecting seat 51 and the third connecting seat 55 have similar height in a narrow space, which results in the similar height of the third hinge shaft 52 and the fourth hinge shaft 54, when the force required by the rotation of the back frame 1 is larger due to the conditions of assembly or long-term use and the like, the second connecting seat 53 cannot push the third connecting seat 55 backwards, which causes the positions of the third hinge shaft 52 and the second connecting seat 53 to move downwards, which results in the second connecting seat 53 pulling the bottom of the back frame 1 forwards through the fourth hinge shaft 54, so that the back frame 1 is further unfolded, which 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 second connecting seat 53, so as to ensure the correct movement direction of the back frame 1.

In this embodiment, the adjusting mechanism comprises a leg rest adjusting assembly 6 comprising 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) and the seventh connecting seat (69) to close, 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 to one end of the sixth connecting seat 67 through an eighth hinge shaft 66, the other end of the sixth connecting seat 67 is hinged to a seventh connecting seat 69 through a ninth hinge shaft 68, the seventh connecting seat 69 is hinged to the leg rest plate 3 through a tenth hinge 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 chair can be folded and unfolded. Further, the interval between the eighth hinge shaft 66 and the ninth hinge shaft 68 is greater than the interval 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. When the chair is in a folded state, the top of the back frame 1 tilts forwards, the bottom of the back frame 1 tilts backwards, and the bottom of the leg placing plate 3 tilts backwards. This scheme can provide certain support for carrying on the back frame 1 through torsional spring 601's setting on the one hand, and on the other hand is when carrying on the back frame 1 and seat frame 2's angle fixation back, and when carrying on the back frame 1 received too big external force, torsional spring 56 can provide certain buffering, and first connecting seat 51 and second connecting seat 53 can take place the swing of small amplitude, avoid the rigidity collision between each part. The difference with in the traditional scheme push away or pull leg rest board reset between the connecting rod, in this embodiment, through the setting of extension spring 601, change the atress position of leg rest board when reseing, and then can make the expansion and the reseing of leg rest board more smooth.

In this embodiment, the height of the connection position of the third connecting 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 portion of the electric push rod 71 is hinged to the first connecting seat 51. Thus, the entire structure of the chair can be simplified.

In this embodiment, the tension spring 601 is always in a state of being stretched and stressed. Thus, the maximum folding angle of the leg rest board 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 plate 3 is hinged to the front end of the seat frame 2 through the mounting plate 31, the mounting plate 31 is fixedly mounted on the rear side of the leg rest plate 3, the mounting plate includes two first connecting portions and two second connecting portions bent backward, the second connecting portions are located between the first connecting portions, the seventh connecting seat 69 is hinged to the second connecting portions through the tenth hinge shaft 60, and the two first connecting portions are hinged to the left and right ends of the seat frame 2 through second hinge shafts respectively; the mounting plate 31 further comprises a guide part 311 extending downwards, and one end of the 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; a second through hole is formed in the guide part 311 and is positioned on 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; the bottom of the seventh connecting seat 69 is provided with a first through hole, 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 the massage movement 12 and the rail frame 11, the massage movement 12 is mounted on the rail frame 11, and the massage movement 12 reciprocates along the rail frame 11. Therefore, the massage device can perform massage activities during resting, so that the human body is more relaxed.

As shown in fig. 7, in the present embodiment, the seat frame 2 includes a bottom plate 21, a seat plate 22, two support plates 23 and a plurality of connecting 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 connecting plates 1, 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 connecting plates, and the two support plates 23 are both fixedly connected with the seat plate 22; linkage, back of the body frame adjusting part 5 and put leg board adjusting part 6 and all be connected with bottom plate 21, two backup pads 23 all with back of the body frame 1 with put leg board 3 articulated, backup pad 23 is used for connecting and supports back of the body frame 1, five connecting seats 64 and bottom plate 21 pass through seventh articulated shaft 65 articulated. 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 placing plate 3 are all coated with an external covering piece for isolating the human body; the outer cover may be a soft bag, bandage, or the like. In this way, a more comfortable experience may be provided to the user.

In this embodiment, the left side and the right side of the back frame 1 are fixedly provided with a first limiting plate 13, the first limiting plate 13 is fixedly provided with a first limiting column 14, the top of the supporting plate 23 is provided with two bayonets 231, the back frame 7 is provided with the first limiting column 14, and when the back frame 1 tilts forwards to the maximum angle, the first limiting column 14 can enter the bayonets 14 and mutually abut against each other; when the top of back of the body frame 1 swung forward, back of the body frame 1 drove first spacing post 14 through first limiting plate 13 and swung forward, and first spacing post 14 swung forward gets into in bayonet 231 gradually until offseting with the bayonet 231 inside wall. Like this, can restrict 1 swing range of back frame on the one hand, on the other hand provides more supports for back frame 1 under folding state, can effectually prevent fatigue. Further, the first stopper plate 133 and the support plate 23 adjacent thereto are hinged by a first hinge shaft, which is located below the rear side of the bayonet 231.

In this embodiment, the base 4 includes supporting legs 41, gas pole 42, spacing post 45 of second and stop collar 44, and gas pole 43 bottom fixed mounting is on supporting legs 41, and the piston rod of gas pole 42 links to each other with the bottom plate 21 of seat frame 2, and the stop collar 44 cover is established on the cylinder of gas pole 42 and both fixed connection, and the spacing groove has been seted up at the stop collar 44 top, and spacing post 45 fixed mounting of second is on the bottom plate 21 of seat frame 2 bottom, and spacing post 45 of second downwardly extending to the spacing inslot. The rotation range of the limited chair that so can relax guarantees safe in utilizationly, can provide more use for the user and experience. Further, the supporting legs 41 are four-star legs, five-star legs or discs.

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 turn 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, so that 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 turns backwards gradually, and the bottom of the back frame 1 turns forwards gradually; 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 plate 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 this process, the seventh connecting seat 69 is always abutted against the leg rest 3.

The folding process of the 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, so that the back frame 1 rotates around the first hinge shaft, the top of the back frame 1 gradually turns forwards in the rotating process of the back frame 1, 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 hinge shaft 62, the fourth connecting seat 61 pulls 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 front to back, the fifth connecting seat 64 pulls the sixth connecting seat 67 backwards through the eighth hinge shaft 66, the sixth connecting seat 67 pulls the seventh connecting seat 69 backwards through the ninth hinge shaft 68, the seventh connecting seat 69 rotates around the tenth hinge shaft 60, the bottom of the seventh connecting seat 69 rotates from front to back, at this time, the seventh connecting seat 69 is not abutted against the leg rest plate 3, the length of the tension spring 3 is changed, the tension spring 3 pulls the bottom of the leg rest plate 3 to rotate around the second hinge shaft until the leg rest plate 3 is abutted against the seventh connecting seat 69; when the leg rest plate 3 and the back frame 1 are folded to a proper angle, the electric push rod 71 stops working, and the folding of the chair is completed.

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, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (8)

1. The utility model provides a put leg board adjustment mechanism, includes seat frame (2), puts leg board (3) and electric putter (71), puts leg board (3) and articulates in seat frame (2) one end, its characterized in that: the fifth connecting seat (64), the sixth connecting seat (67) and the seventh connecting seat (69), the fifth connecting seat (64) is hinged to the seat frame (2), the electric push rod (71) is connected with the fifth connecting seat (64) and can drive the fifth connecting seat (64) to swing, one end of the sixth connecting seat (67) is hinged to the fifth connecting seat (64) through an eighth hinge shaft (66), the other end of the sixth connecting seat (67) is hinged to the seventh connecting seat (69) through a ninth hinge shaft (68), the seventh connecting seat (69) is hinged to the leg rest plate (3) through a tenth hinge shaft (60), and the distance between the eighth hinge shaft (66) and the ninth hinge shaft (68) is greater than the distance between the ninth hinge shaft (68) and the tenth hinge shaft (60); the leg rest device is characterized by further comprising a tension spring (601) capable of enabling the seventh connecting seat (69) and the leg rest plate (3) to be close, one end of the tension spring (601) is connected to the seventh connecting seat (69), and the other end of the tension spring (601) is connected to the leg rest plate (3).

2. A leg rest adjustment mechanism as claimed in claim 1, wherein: the electric push rod (71) drives the fifth connecting seat (64) to swing through the linkage piece, and the electric push rod (71) and the fifth connecting seat (64) are arranged side by side in the left-right direction.

3. A leg rest adjustment mechanism as claimed in claim 2, wherein: still include fourth connecting seat (61), the linkage passes through fourth connecting seat (61) and is connected with fifth connecting seat (64), and the one end and the linkage of fourth connecting seat (61) are articulated, and the other end of fourth connecting seat (61) passes through sixth articulated shaft (63) and is articulated with fifth connecting seat (64), and fifth connecting seat (64) are articulated with seat frame (2) through seventh articulated shaft (65).

4. A leg rest adjustment mechanism as claimed in claim 3, wherein: the distance from the seventh hinge axis (65) to the sixth hinge axis (63) is smaller than the distance from the seventh hinge axis (65) to the eighth hinge axis (66).

5. A leg rest adjustment mechanism as claimed in claim 1, wherein: the tension spring (601) is always in a tension and force storage state.

6. A leg rest adjustment mechanism as claimed in claim 1, wherein: the leg placing plate (3) is hinged with the seat frame (2) through a second hinged shaft, and the height of the position of the second hinged shaft is higher than that of the position of a tenth hinged shaft (60).

7. A leg rest adjustment mechanism as claimed in claim 1, wherein: the leg placing plate (3) is hinged to the front end of the seat frame (2) through a mounting plate (31), and the leg placing plate (3) is fixedly connected with the mounting plate (31); mounting panel (31) are including two first connecting portions and two second connecting portions of backward bending type, and the second connecting portion are located between the first connecting portion, and first connecting portion are articulated with seat frame (2), and the second connecting portion is articulated with seventh connecting seat (69), and the other end of extension spring (601) is connected on mounting panel (31).

8. A chair, characterized in that: a leg rest adjustment mechanism comprising a leg rest as claimed in any one of claims 1 to 7, further comprising a base (4), the mounting (2) being rotatably mounted on the base (4).

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