CN218571801U - Chair and waist rest assembly thereof - Google Patents

Abstract

The utility model discloses a chair and subassembly is leaned on to waist thereof, lean on the mounting including the waist, back of the chair mounting, flexible subassembly and energizing mechanism, flexible subassembly includes two pairs of link mechanism, link mechanism includes first connecting rod, the second connecting rod, third connecting rod and fourth connecting rod, the upper end of back of the chair mounting is articulated with the upper end of first connecting rod, first connecting rod lower extreme is articulated with the rear end of second connecting rod, the front end of second connecting rod is articulated with the lower extreme that the mounting was leaned on to the waist, the lower extreme of back of the chair mounting is articulated with the rear end of fourth connecting rod, the front end of fourth connecting rod is articulated with the lower extreme of third connecting rod, the upper end of third connecting rod is articulated with the upper end that the mounting was leaned on to the waist, the middle part of first connecting rod is articulated with the middle part of fourth connecting rod. The first connecting rod of this scheme leans on the mounting articulated through the second connecting rod with the waist, and the third connecting rod passes through the fourth connecting rod and back of the chair mounting articulated to when making link mechanism flexible, the waist is by reciprocating around can, and the user adjusts the waist according to self demand and leans on the angle.

Description

Chair and waist rest assembly thereof

Technical Field

The utility model relates to a chair field especially relates to a chair and waist leans on subassembly thereof.

Background

The chair is a tool for supporting the buttocks of a human body when people are at home for leisure, work or reading, and a common chair is provided with a backrest, so that the back of the human body can lean on the backrest. However, when a person leans against the backrest of the chair, the waist of the person is often unsupported, resulting in a tendency for soreness of the waist during sedentary use.

At present, a plurality of chairs exist in the market, a waist rest assembly is arranged at the waist position of a chair backrest, and when people sit on the chair, the waist rest is used for generating a waist supporting effect at the waist position of the people to support the waist of a human body.

CN203814987U discloses an improved waist support structure of a seat, comprising a seat, a waist support mechanism and a waist support cushion body, wherein the waist support mechanism is connected with the waist support cushion body group and arranged in a seat back groove of the seat, the waist support cushion body and the groove are connected by two connecting rod groups, wherein the two connecting rod groups comprise a first connecting rod and a second connecting rod which are in cross pivot joint, and a third connecting rod and a fourth connecting rod which are in cross pivot joint, CN215686105U discloses an infinite locking by-wire adjusting mechanism of the seat waist support, a connecting rod shaft connecting a hinge plate two is enabled to slide up and down in a sliding groove in an adjusting limit side plate by pulling a protecting pipe sleeve on a by-wire rope, a short shaft on the hinge plate is driven to slide up and down in a sliding groove in a waist support mounting plate under the supporting action of a middle shaft, and finally the waist support mounting plate is pushed to perform the adjustment process of the seat waist support, and the two prior art adopt a cross telescopic connecting rod mechanism to enable the waist support to move back and forth in the horizontal direction, thereby adjusting the waist support; CN213962559 discloses an electronic lumbar support adjusts structure, adopts four-bar linkage to make the waist lean on the back-and-forth movement in the horizontal direction, wherein, flexible subassembly includes that left front extension pole, right front extension pole, left back extension pole and right back extension pole extend, and left front extension pole, right front extension pole, left back extension pole and right back extension pole enclose synthetic rhombus, left front extension pole with the front end of right front extension pole all with preceding support piece is articulated, left back extension pole with the rear end of right back extension pole all with back support piece is articulated, left front extension pole rear end with the front end of left back extension pole is articulated, the rear end of right front extension pole with the front end of right back extension pole is articulated. However, the link mechanism in the prior art cannot adjust the angle of the waist rest along with the change of the sitting posture of the user, which easily causes discomfort for the user to lean on for a long time; moreover, the linkage mechanism is prone to jamming when extended to the limit, thereby causing the lumbar support assembly to fail.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, the present invention provides a chair and a lumbar support assembly thereof, which can adjust the lumbar support angle along with the change of the sitting posture of the user.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a waist leans on subassembly for connect the waist and lean on and the back of the chair, lean on mounting, back of the chair mounting, be used for connecting the waist and lean on the flexible subassembly of mounting and back of the chair mounting and be used for driving flexible subassembly flexible enabling mechanism including the waist, flexible subassembly includes two pairs of relative link mechanism that sets up about, link mechanism includes first connecting rod, second connecting rod, third connecting rod and fourth connecting rod, the upper end of back of the chair mounting forms first hookup location with the upper end of first connecting rod is articulated, and the rear end of first connecting rod lower extreme and second connecting rod is articulated to form the second hookup location, and the front end of second connecting rod and the lower extreme of waist lean on the mounting articulate to form the third hookup location, the lower extreme of back of the chair mounting and the rear end of fourth connecting rod articulate to form the fourth hookup location, and the front end of fourth connecting rod and the lower extreme of third connecting rod articulate to form the fifth hookup location, and the upper end of waist by the third connecting rod articulate to form the sixth hookup location, the middle part of first connecting rod articulates with the middle part of third connecting rod forms the seventh hookup location. Like this, through setting up first connecting rod, second connecting rod, third connecting rod and fourth connecting rod, make first connecting rod lean on the mounting articulated with the waist through the second connecting rod, make the third connecting rod articulated with back of the chair mounting through the fourth connecting rod to when making link mechanism flexible, the waist is by reciprocating around can, thereby according to the angle that the appropriate regulation waist of user's demand was leaned on.

Preferably, the energizing mechanism is a spring assembly, the spring assembly comprises a first connecting shaft, a spring, a second connecting shaft and a telescopic rod, the left end and the right end of the first connecting shaft are respectively connected with the two first connecting rods to form an eighth connecting position, and the eighth connecting position is located between the first connecting position and the seventh connecting position; the lower extreme of back of the chair mounting is articulated through the second connecting axle with the rear end of fourth connecting rod, the both ends of telescopic link respectively with first connecting axle and second connecting axle fixed connection, the spring housing is established on the telescopic link, two link mechanism symmetries set up the left and right sides at the spring. Energizing the second connecting shaft through the spring, driving the fourth connecting rod to rotate through the expansion and contraction of the telescopic rod, so as to drive the expansion and contraction of the connecting rod mechanisms, reset the telescopic rod through the spring, ensure that the position applied by the spring elasticity is always in the middle of the first connecting shaft and the middle of the second connecting shaft, and ensure that the stress of the two connecting rod mechanisms is balanced.

As preferred, spring unit still includes gear board and gear, the upper end of gear board articulates on first connecting axle, and the middle part of gear board is from last to having a plurality of gear hole down, the guiding hole that has a bar is opened to the lower part of gear board, the second connecting axle is worn to establish in the guiding hole and can be followed the guiding hole and removed, the gear is installed on the back of the chair mounting, and the gear is used for inserting the gear of gear board downthehole. When user's flexible link mechanism made the waist lean on reaching comfortable supported position, the gear piece inserted the gear hole of gear board to compress spring unit at fixed gear, in addition, owing to there are second connecting rod and fourth connecting rod, thereby the user can lean on carrying out certain rotation at this fixed gear to the waist and make the waist lean on user's lumbar support position of laminating more.

Preferably, the spring assembly further comprises a third connecting shaft and a fixing piece, the upper end of the chair back fixing piece is hinged to the upper end of the first connecting rod through the third connecting shaft, the fixing piece is fixedly arranged between the two first connecting rods, and the fixing piece is located between the first connecting shaft and the third connecting shaft. Make two first connecting rods synchronous motion about through the mounting to shield spring unit, prevent that the foreign matter from getting into spring unit department.

Preferably, the left side and the right side of the waist rest fixing part are respectively provided with a first limiting shaft for preventing the link mechanism from being blocked, and when the link mechanism is completely compressed, the front side of the third link abuts against the first limiting shaft. This prevents the linkage mechanism from over-compressing and causing it to jam.

Preferably, the energizing mechanism is a gas spring assembly, the front end of the gas spring assembly is hinged to the waist rest, and the rear end of the gas spring assembly is hinged to the chair back. Through setting up the gas spring unit in back of the chair lower part directly to the waist leans on and energized to drive link mechanism's flexible, make the waist lean on can reciprocate from beginning to end, thereby can be according to the angle that the user demand was appropriate adjusts the waist and leans on.

Preferably, the left side and the right side of the chair back fixing part are respectively provided with a second limiting shaft for preventing the connecting rod mechanism from being blocked, and when the connecting rod mechanism is completely compressed, the rear side of the first connecting rod is abutted against the second limiting shaft; this prevents the linkage mechanism from over-compressing and causing it to jam. A third limiting shaft is arranged on the fourth connecting rod; the lower extreme of back of the chair mounting is equipped with a spacing notch with the spacing axle adaptation of third, and when link mechanism was prolonged completely, the fourth connecting rod upwards rotated, and the upper end of the spacing axle of third offsets with the spacing notch on the back of the chair mounting to prevent that gas spring assembly from excessively extending.

Preferably, the energizing mechanism is a gas spring assembly, the waist rest assembly further comprises a third connecting seat and a fourth connecting seat, one end of the third connecting seat is hinged to the lower end of the gas spring assembly, and the other end of the third connecting seat is fixedly connected to the seat back fixing piece; one end of the fourth connecting seat is hinged with the upper end of the gas spring assembly, and the other end of the fourth connecting seat is fixedly connected to the waist rest fixing piece. Thus, the waist support fixing piece, the chair back fixing piece, the gas spring assembly and the telescopic assembly in the waist support assembly can be pre-assembled into a whole, and the installation is more convenient.

Preferably, the waist support fixing part comprises a waist support fixing plate and two first connecting pieces positioned at the left side and the right side of the rear part of the waist support fixing plate, the waist support fixing plate and the first connecting pieces are arranged at a right angle, the upper end of the third connecting rod is hinged with the upper end of the first connecting piece to form a sixth connecting position, and the front end of the second connecting rod is hinged with the lower end of the first connecting piece to form a third connecting position; the chair back fixing part comprises a chair back fixing plate and second connecting pieces positioned on the left side and the right side of the front part of the chair back fixing plate, the chair back fixing plate and the second connecting pieces are arranged in a right angle, the upper end of each second connecting piece is hinged with the upper end of the corresponding first connecting rod to form a first connecting position, and the lower end of each second connecting piece is hinged with the rear end of the corresponding fourth connecting rod to form a fourth connecting position; the waist rest fixing plate is composed of one plate or two independent plates on the left and the right; the chair back fixing plate is composed of one plate or two independent plates on the left and the right.

A chair comprising a lumbar support assembly as described above.

The utility model discloses owing to adopted above technical scheme, have following benefit:

1. the utility model adopts the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod as the connecting rod mechanism, so that the first connecting rod is hinged with the waist rest fixing piece through the second connecting rod, and the third connecting rod is hinged with the chair back fixing piece through the fourth connecting rod, so that when the connecting rod mechanism is stretched, the waist rest can move up and down, and the angle of the waist rest can be properly adjusted according to the requirements of users;

2. the utility model discloses a set up gear board and gear, when the flexible link mechanism of user makes the waist lean on to reach comfortable support position, the gear passes the fixed orifices of back of the chair mounting and inserts in the gear hole of gear board to compress the spring unit at fixed gear, and owing to there are second connecting rod and fourth connecting rod, the user can carry out certain rotation to the waist at this fixed gear and make the waist lean on the waist support position of laminating the user more;

3. the utility model discloses a set up the waist and lean on the left and right sides of mounting or back of the chair mounting to set up spacing axle, when link mechanism compresses completely, thereby can prevent that link mechanism excessively compresses and lead to its card to die.

Drawings

FIG. 1 is a schematic view of the connection structure of the lumbar support, the seat back and the lumbar support assembly of example 1;

FIG. 2 is a schematic view of the lumbar assembly of FIG. 1;

FIG. 3 is a partial exploded view of FIG. 2;

FIG. 4 is a schematic view of the structure of FIG. 2 at another angle;

FIG. 5 is a schematic view of the lumbar support mount and back mount of FIG. 4 with the lumbar mount and back mount removed;

FIG. 6 is a schematic view of the lumbar assembly of FIG. 2 in a compressed configuration;

FIG. 7 is a schematic view of the structure of FIG. 6 at another angle;

FIG. 8 is a schematic view of the arrangement of FIG. 7 with lumbar mounts and back mounts removed;

FIG. 9 is a schematic view of the connection structure of the lumbar support, seat back and lumbar support assembly of embodiment 2;

FIG. 10 is a schematic view of the lumbar support assembly of FIG. 9 (without the gas spring assembly);

figure 11 is a schematic view of the lumbar assembly of figure 10 after compression (without the gas spring assembly);

FIG. 12 is a schematic view of the construction of the chair back of FIG. 9;

figure 13 is a schematic view of the lumbar support of figure 9;

figure 14 is a schematic view of the compressed lumbar assembly of example 3 (without lumbar mounts).

Reference numerals:

1. a waist support; 11. a first connecting seat;

2. a chair back; 21. a second connecting seat;

3. a lumbar support fixing member; 31. a waist support fixing plate; 32. a first connecting member; 33. a first limit shaft;

4. a chair back fixing piece; 41. a chair back fixing plate; 42. a second connecting member; 421. a fixing hole; 43. a second limit shaft;

5. a link mechanism; 51. a first link; 52. a second link; 53. a third link; 54. a fourth link; 541. a third limiting shaft; 55. a first connection location; 56. a second attachment location; 57. a third connection location; 58. a fourth connection location; 59. A fifth connection location; 510. a sixth attachment location; 511. a seventh connection location;

6. a spring assembly; 61. a first connecting shaft; 62. a spring; 63. a second connecting shaft; 64. a telescopic rod; 65. a gear plate; 651. A gear hole; 652. a guide hole; 66. a gear member; 67. a third connecting shaft; 68. a fixing member;

7. a gas spring assembly; 71. a gas spring; 72. a first support; 721. a first rotating shaft; 73. a second support member; 731. a second rotating shaft;

8. a third connecting seat;

9. and a fourth connecting seat.

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 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 exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present 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 or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed 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," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. 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.

For clarity, the side of the lumbar support is the front side, and the other side is the back side.

The utility model discloses a chair, lean on 1, the back of the chair 2 and as follows a lumbar support subassembly, the lumbar support subassembly is used for connecting lumbar support 1 and the back of the chair 2.

Example 1:

as shown in fig. 1 to 8, the lumbar support assembly includes a lumbar support fixing member 3, a chair back fixing member 4, a telescopic assembly for connecting the lumbar support fixing member 3 and the chair back fixing member 4, and an energizing mechanism for driving the telescopic assembly to extend and retract, the telescopic assembly includes two pairs of link mechanisms 5 disposed opposite to each other in the left-right direction, the link mechanisms 5 include a first link 51, a second link 52, a third link 53, and a fourth link 54, the upper end of the chair back fixing member 4 is hinged to the upper end of the first link 51 to form a first connection position 55, the lower end of the first link 51 is hinged to the rear end of the second link 52 to form a second connection position 56, the front end of the second link 52 is hinged to the lower end of the lumbar support fixing member 3 to form a third connection position 57, the lower end of the chair back fixing member 4 is hinged to the rear end of the fourth link 54 to form a fourth connection position 58, the front end of the fourth link 54 is hinged to the lower end of the third link 53 to form a fifth connection position 59, the upper end of the third link 53 is hinged to the upper end of the lumbar support fixing member 3 to form a sixth connection position 511, and the middle of the first link 51 is hinged to form a seventh connection position 511. Like this, through setting up first connecting rod 51, second connecting rod 52, third connecting rod 53 and fourth connecting rod 54, make first connecting rod 51 articulated with waist through second connecting rod 52 and lean on mounting 3, make third connecting rod 53 articulated with back of the chair mounting 4 through fourth connecting rod 54, thereby when driving link mechanism 5 through enabling, waist leans on 1 and can reciprocate from beginning to end, can both support user's waist in different sitting depths, can also be according to the angle that the suitable regulation waist of user's position of sitting demand was leaned on.

In the present invention, the lumbar support fixing member 3 includes a lumbar support fixing plate 31 and two first connecting members 32 located at the left and right sides of the rear portion of the lumbar support fixing plate 31, the lumbar support fixing plate 31 and the first connecting members 32 are arranged at a right angle, the lumbar support fixing plate 31 and the first connecting members 32 are welded and fixed or integrally bent, the upper end of the third connecting rod 53 is hinged to the upper end of the first connecting members 32 to form a sixth connecting position 510, and the front end of the second connecting rod 52 is hinged to the lower end of the first connecting members 32 to form a third connecting position 57; back of the chair mounting 4 includes back of the chair fixed plate 41 and is located the second connecting piece 42 of the anterior left and right sides of back of the chair fixed plate 41, back of the chair fixed plate 41 is the right angle setting with second connecting piece 42, back of the chair fixed plate 41 and second connecting piece 42 welded fastening or integrative the buckling becomes, the upper end of second connecting piece 42 and the articulated first hookup location 55 that forms in upper end of first connecting rod 51, the lower extreme of second connecting piece 42 and the articulated fourth hookup location 58 that forms in rear end of fourth connecting rod 54. In one embodiment, the lumbar support fixing plate 31 is formed of one plate such that the first connecting members 32 are disposed at both left and right sides of the lumbar support fixing plate 31, and in another embodiment, the lumbar support fixing plate 31 is formed of two separate plates at left and right sides and fixed to the lumbar support 1, respectively, such that the two first connecting members 32 are disposed at both the lumbar support fixing plates 31, respectively. In one embodiment, the back fixing plate 41 is formed of one plate such that the second link members 42 are disposed at both left and right sides of the back fixing plate 41, and in another embodiment, the back fixing plate 41 is formed of two separate plates at left and right sides and fixed to the back 2, respectively, such that the two second link members 42 are disposed at the two back fixing plates 41, respectively.

In the present embodiment, the energizing mechanism is a spring assembly 6, the spring assembly includes a first connecting shaft 61, a spring 62, a second connecting shaft 63 and a telescopic rod 64, the left and right ends of the first connecting shaft 61 are respectively connected with the two first connecting rods 51 to form an eighth connecting position 512, and the eighth connecting position 512 is located between the first connecting position 55 and the seventh connecting position 511; the lower extreme of back of the chair mounting 4 and the rear end of fourth connecting rod 54 pass through second connecting axle 63 and articulate, the both ends of telescopic link 64 respectively with first connecting axle 61 and second connecting axle 63 fixed connection, the spring 62 cover is established on telescopic link 64, two link mechanism 5 symmetries set up the left and right sides at spring 62. Energizing the second connecting shaft 63 through the spring 62, driving the fourth connecting rod 54 to rotate through the expansion and contraction of the telescopic rod 64, thereby driving the expansion and contraction of the link mechanism 5, resetting the telescopic rod 64 through the spring 62, ensuring that the elastic force of the spring 62 is always applied in the middle of the first connecting shaft 61 and the middle of the second connecting shaft 63, and ensuring the stress balance of the two link mechanisms 5.

In this embodiment, the upper end of the telescopic rod 64 is fixed on the first connecting shaft 61 in a limiting manner, or the telescopic rod 64 is sleeved on the first connecting shaft 61; the lower end of the telescopic rod 64 is fixed on the second connecting shaft 62, or the lower end of the telescopic rod 64 is sleeved on the second connecting shaft 62.

Usually the user has fixed seat depth on same chair, and it is very inconvenient that the user all adjusts waist and lean on 1 when sitting down at every turn, therefore, in this embodiment, spring assembly still includes gear board 65 and gear piece 66, the upper end of gear board 65 articulates on first connecting axle 61, and the middle part of gear board 65 has opened a plurality of gear hole 651 from last to down, the guiding hole 652 of a bar is opened to the lower part of gear board 65, second connecting axle 63 wears to establish in guiding hole 652 and can follow guiding hole 652 and remove, gear piece 66 installs on back of the chair mounting 4, and gear piece 66 is used for inserting in gear hole 651 of gear board 65. When the user telescopic link mechanism 5, the gear plate 65 moves up and down and limits the up-and-down movement stroke of the gear plate 65 through the guide hole 652, when the lumbar support 1 reaches a comfortable supporting position, the gear piece 66 installed on the chair back fixing piece 4 is inserted into the gear hole 651 of the gear plate 65, thereby compressing the spring assembly 6 at a fixed gear, when the user leaves the seat, the lumbar support 1 cannot automatically reset, the position of the lumbar support 1 does not need to be adjusted every time, besides, because of the existence of the second connecting rod 52 and the fourth connecting rod 54, the user can carry out certain rotation on the lumbar support 1 at the fixed gear, thereby enabling the lumbar support 1 to be more fit with the lumbar supporting position of the user.

Preferably, the spring assembly further includes a third connecting shaft 67 and a fixing member 68, the upper end of the seat back fixing member 4 is hinged to the upper end of the first connecting rod 51 through the third connecting shaft 67, the fixing member 68 is fixedly disposed between the two first connecting rods 51 through screws, and the fixing member 68 is disposed between the first connecting shaft 61 and the third connecting shaft 67. Thus, the left and right first links 51 are moved synchronously by the fixing member 68, and the spring assembly 6 is shielded to prevent foreign matters from entering the spring assembly 6.

In order to prevent link mechanism 5 card when stretching out and drawing back to the limit extremely die the utility model discloses in, the waist is equipped with one respectively by the left and right sides of mounting 3 and is used for preventing link mechanism 5 card dead first spacing axle 33, and when link mechanism 5 compressed completely, the front side and the first spacing axle 33 of third connecting rod 53 offset.

In this embodiment, the rear end of the second link 52 is matched with the front end of the third link, and the front side of the second link 42 of the seat back fixing member 4 is provided with a recess having a shape similar to that of the screw for fixing the fixing member 68 of the first link 51, so that the positions of the respective members are prevented from being interfered with each other when the link mechanism 5 is compressed, and thus the seat back fixing member cannot be completely compressed.

Example 2:

unlike the embodiment 1 in which the energizing mechanism is spring assembly 6, in this embodiment, as shown in fig. 9 to 13, the energizing mechanism is a gas spring assembly 7, the front end of gas spring assembly 7 is hinged to lumbar support 1, and the rear end of gas spring assembly 7 is hinged to seat back 2. Through setting up the gas spring unit 6 in 2 lower parts of the back of the chair directly to the waist leans on 1 and give way to drive link mechanism 5 flexible, make the waist lean on 1 can reciprocate from beginning to end, thereby the user can be according to the appropriate angle of adjusting the waist and leaning on 1 of self demand.

In this embodiment, a first connecting seat 11 is fixedly disposed in the middle of the lumbar support 1, and the front end of the gas spring assembly 7 is hinged to the first connecting seat 11; the lower part of the chair back 2 is fixedly provided with a second connecting seat 21, and the front end of the gas spring assembly 7 is hinged with the second connecting seat 21.

In this embodiment, the left and right sides of the seat back fixing member 4 are respectively provided with a second limiting shaft 43 for preventing the link mechanism 5 from being locked, and when the link mechanism 5 is completely compressed, the rear side of the first link 51 abuts against the second limiting shaft 43.

In this embodiment, a third limiting shaft 541 is disposed on the fourth connecting rod 54; the lower end of the second connecting member 42 is provided with a limit notch matched with the third limit shaft 541, when the link mechanism 5 is fully extended, the fourth connecting rod 54 rotates upwards, and the upper end of the third limit shaft 541 abuts against the limit notch on the second connecting member 54, so that the gas spring assembly 71 is prevented from being excessively extended.

In this embodiment, a pull rod or a pull rope is mounted on the gas spring assembly 7 for controlling the expansion and contraction of the gas spring assembly 7.

Example 3:

unlike the lumbar support 1 directly driven by the gas spring assembly 7 in embodiment 2, in this embodiment, the lumbar support assembly further includes a third connecting seat 8 and a fourth connecting seat 9, one end of the third connecting seat 8 is hinged to the lower end of the gas spring assembly 7, and the other end of the third connecting seat 8 is fixedly connected to the seat back fixing member 4; one end of the fourth connecting seat 9 is hinged with the upper end of the gas spring assembly 7, and the other end of the fourth connecting seat 9 is fixedly connected to the waist rest fixing piece 3. Thus, the gas spring assembly 7 drives the lumbar support fixing member 3 to drive the link mechanism 5 to extend and retract, so that the lumbar support assembly can be assembled together in advance when being assembled, and when the lumbar support 1 and the chair back 2 are connected, only the chair back fixing member 4 in the lumbar support assembly needs to be installed on the chair back 2, and the lumbar support 1 is installed on the lumbar support fixing member 3.

In this embodiment, a pull rod or a pull rope is mounted on the gas spring assembly 7 for controlling the expansion and contraction of the gas spring assembly 7.

All features described in the description, the appended claims and the drawings, either individually or in any combination thereof, are essential features of the invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "one implementation," "a specific implementation," "other implementations," "examples," "specific examples," 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, implementation, 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 above may also be combined in any suitable manner in any one or more of the embodiments, examples, or examples. The present disclosure also includes any one or more of the particular features, structures, materials, or characteristics described above, either individually or in combination.

Although the embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions, variations, deletion of partial features, addition of features or re-combination of features without departing from the spirit and scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the innovative principles of the present invention are all within the scope of the present invention.

Claims (10)

1. A lumbar support assembly is used for connecting a lumbar support (1) and a chair back (2), and comprises a lumbar support fixing member (3), a chair back fixing member (4), a telescopic assembly used for connecting the lumbar support fixing member (3) and the chair back fixing member (4) and an energizing mechanism used for driving the telescopic assembly to stretch, and is characterized in that the telescopic assembly comprises two pairs of link mechanisms (5) which are oppositely arranged left and right, each link mechanism (5) comprises a first connecting rod (51), a second connecting rod (52), a third connecting rod (53) and a fourth connecting rod (54), the upper end of the chair back fixing member (4) is hinged with the upper end of the first connecting rod (51) to form a first connecting position (55), articulated second hookup location (56) that forms of the rear end of first connecting rod (51) lower extreme and second connecting rod (52), the front end of second connecting rod (52) and the articulated third hookup location (57) that forms of lower extreme that leans on mounting (3) of waist, the articulated fourth hookup location (58) that forms of the lower extreme of back of the chair mounting (4) and the rear end of fourth connecting rod (54), the articulated fifth hookup location (59) that forms of the front end of fourth connecting rod (54) and the lower extreme of third connecting rod (53), the articulated sixth hookup location (510) that forms of the upper end that leans on mounting (3) of third connecting rod (53) and waist, the articulated seventh hookup location (511) that forms in middle part and the middle part of third connecting rod (53) of first connecting rod (51) ).

2. A lumbar support assembly according to claim 1, characterized in that said energizing means is a spring assembly (6) comprising a first connecting shaft (61), a spring (62), a second connecting shaft (63) and a telescopic rod (64), said first connecting shaft (61) being connected at its left and right ends to two first connecting rods (51) respectively forming an eighth connecting position (512), said eighth connecting position (512) being located between the first connecting position (55) and the seventh connecting position (511); the lower extreme of back of the chair mounting (4) is articulated through second connecting axle (63) with the rear end of fourth connecting rod (54), the both ends of telescopic link (64) respectively with first connecting axle (61) and second connecting axle (63) fixed connection, spring (62) cover is established on telescopic link (64), two link mechanism (5) symmetry sets up the left and right sides at spring (62).

3. The lumbar support assembly according to claim 2, wherein the spring assembly further comprises a shift plate (65) and a shift member (66), the upper end of the shift plate (65) is hinged to the first connecting shaft (61), the middle of the shift plate (65) is provided with a plurality of shift holes (651) from top to bottom, the lower portion of the shift plate (65) is provided with a strip-shaped guide hole (652), the second connecting shaft (63) penetrates through the guide hole (652) and can move along the guide hole (652), the shift member (66) is mounted on the chair back fixing member (4), and the shift member (66) is used for being inserted into the shift holes (651) of the shift plate (65).

4. A lumbar support assembly according to claim 3, characterized in that said spring assembly further comprises a third connecting shaft (67) and a fixing member (68), the upper end of said seat back fixing member (4) is hinged to the upper end of the first connecting rod (51) through the third connecting shaft (67), said fixing member (68) is fixedly arranged between the two first connecting rods (51), said fixing member (68) is located between the first connecting shaft (61) and the third connecting shaft (67).

5. A lumbar support assembly according to claim 2, characterized in that the left and right sides of the lumbar support fixture (3) are respectively provided with a first limiting shaft (33) for preventing the link mechanism (5) from being locked, and when the link mechanism (5) is completely compressed, the front side of the third link (53) abuts against the first limiting shaft (33).

6. A lumbar support assembly according to claim 1, characterized in that said energizing means are gas spring assemblies (7), the front ends of said gas spring assemblies (7) being hinged to the lumbar support (1) and the rear ends of the gas spring assemblies (7) being hinged to the seat back (2).

7. A lumbar support assembly according to claim 6, characterized in that a second limiting shaft (43) for preventing the link mechanism (5) from being locked is respectively arranged at the left side and the right side of the seat back fixing member (4), and when the link mechanism (5) is completely compressed, the rear side of the first link (51) is abutted against the second limiting shaft (43); a third limiting shaft (541) is arranged on the fourth connecting rod (54); the lower end of the chair back fixing piece (4) is provided with a limiting notch matched with the third limiting shaft (541), and when the connecting rod mechanism (5) is completely extended, the upper end of the third limiting shaft (541) is abutted to the limiting notch on the chair back fixing piece (4).

8. A lumbar support assembly according to claim 1, characterized in that said energizing means is a gas spring assembly (7), said lumbar support assembly further comprising a third connecting seat (8) and a fourth connecting seat (9), one end of said third connecting seat (8) being hinged to the lower end of the gas spring assembly (7), the other end of the third connecting seat (8) being fixedly connected to the seat back fixing member (4); one end of the fourth connecting seat (9) is hinged with the upper end of the gas spring assembly (7), and the other end of the fourth connecting seat (9) is fixedly connected to the waist rest fixing piece (3).

9. A lumbar support assembly according to claim 1, characterized in that the lumbar support fixing member (3) comprises a lumbar support fixing plate (31) and two first connecting members (32) arranged at the left and right sides of the rear part of the lumbar support fixing plate (31), the lumbar support fixing plate (31) is arranged at right angle to the first connecting members (32), the upper end of the third connecting rod (53) is hinged to the upper end of the first connecting member (32) to form a sixth connecting position (510), and the front end of the second connecting rod (52) is hinged to the lower end of the first connecting member (32) to form a third connecting position (57); the chair back fixing piece (4) comprises a chair back fixing plate (41) and second connecting pieces (42) positioned on the left side and the right side of the front part of the chair back fixing plate (41), the chair back fixing plate (41) and the second connecting pieces (42) are arranged in a right angle mode, the upper ends of the second connecting pieces (42) are hinged to the upper end of a first connecting rod (51) to form a first connecting position (55), and the lower ends of the second connecting pieces (42) are hinged to the rear end of a fourth connecting rod (54) to form a fourth connecting position (58); the waist rest fixing plate (31) is composed of one plate or two independent plates at left and right; the chair back fixing plate (41) is composed of one plate or two independent plates at left and right.

10. A chair comprising a lumbar support assembly as claimed in any of claims 1-9.

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