CN219047868U - Chair back tilting adjusting mechanism and chair - Google Patents

Abstract

The utility model discloses a chair back tilting adjusting mechanism and a chair, wherein the chair back tilting adjusting mechanism comprises a rotating arm, a spring plate group and a fixed block, wherein the lower end of the rotating arm acts on the upper end of the spring plate group, the chair back tilting adjusting mechanism further comprises a first reinforcing piece and a second reinforcing piece, an upward opening slot is formed in the fixed block, the spring plate group is arranged in the slot, the upper end of the spring plate group extends out of the slot, a first groove and a second groove are sequentially formed in the front part of the slot, the lengths of the slot, the first groove and the second groove are sequentially reduced, the first reinforcing piece is embedded in the first groove, the second reinforcing piece is embedded in the second groove, and the second reinforcing piece, the first reinforcing piece and the spring plate group are propped against each other. According to the scheme, the length of the fixed block is increased, the contact area between the elastic sheet group and the fixed block is increased, the acting force of the elastic sheet group to the fixed block is dispersed to the whole fixed block through the first reinforcing sheet and the second reinforcing sheet, so that the stress born by the lower part of the fixed block is reduced, and the structural strength of the fixed block is increased.

Description

Chair back tilting adjusting mechanism and chair

Technical Field

The utility model relates to the field of office furniture, in particular to a chair back tilting adjusting mechanism and a chair.

Background

The existing chairs generally comprise a chair back, a chair seat and chair legs, and in order to adapt to the sitting posture of a user and adjust the visual field of the user, the chair is also generally provided with a chair back tilting adjusting mechanism capable of adjusting the chair back at a small angle. In conference places, a large number of chairs are usually required to be placed at one time, and the whole chair is required to be relatively compact. Patent document with publication number CN212815290U discloses a conference chair and a backrest tilting adjusting device thereof, the backrest tilting adjusting device comprises a backrest joint, a chair leg joint and the like, the backrest joint and the chair leg joint are coaxially pivoted by locking a fixing piece and a locking piece, the backrest joint is reset through a resetting piece, the backrest tilting adjusting device is stable in structure and not easy to damage, but the backrest tilting adjusting device is complex in structure, the backrest joint and the backrest joint are exposed, the conference chair is not attractive in appearance when being arranged in a large number, the backrest of the conference chair cannot be reset automatically, the backrest is required to be adjusted manually after the conference is finished, and the storage is complex.

In order to solve the above-mentioned problem, patent document with publication number CN107048800a discloses a reclining adjusting mechanism of a chair back and a conference chair, the reclining adjusting mechanism of the chair back comprises a rotating arm, a spring plate group and a fixed block, the reclining angle adjustment of the chair back in a smaller angle is realized through bending of the spring plate group, but in the structure, the lower end of the spring plate group is only a small section fixed in the fixed block, the strength of the fixed block is poor, when the back of a user applies force to the chair back to bend the spring plate group, the upper end of the spring plate group is bent forward by forward acting force, because the spring plate group is inserted into a slot, the lower end of the spring plate group applies forward acting force to the lower end of the slot, and the lower part of the fixed block is stressed greatly, thereby damaging the fixed block.

Disclosure of Invention

In order to solve the technical problems, one of the purposes of the utility model is to provide a chair back tilting adjustment mechanism which not only can realize the small-angle tilting adjustment of the chair back, but also has simple structure and high structural strength.

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

the chair back tilting adjusting mechanism comprises a rotating arm, an elastic sheet group and a fixed block, wherein the rotating arm is used for being connected with a chair back, the fixed block is used for being connected with a chair foot rest or a chair seat, the lower end of the rotating arm acts on the upper end of the elastic sheet group and further comprises a first reinforcing sheet and a second reinforcing sheet, an upward slot is formed in the fixed block, the elastic sheet group is arranged in the slot, the upper end of the elastic sheet group extends out of the slot, a first groove and a second groove are sequentially formed in the front portion of the slot, the lengths of the slot, the first groove and the second groove are sequentially reduced, the first reinforcing sheet is embedded in the first groove, the second reinforcing sheet is embedded in the second groove, and the second reinforcing sheet, the first reinforcing sheet and the elastic sheet group are propped against each other. Like this, through increasing the length of fixed block, when the lower extreme effect of rotating arm makes the shell fragment group crooked in the upper end of shell fragment group, increased the contact area of shell fragment group and fixed block, moreover, the effort of shell fragment group for the fixed block is dispersed to whole fixed block through first reinforcement piece and second reinforcement piece to reduce the stress that the fixed block lower part received, and disperse the stress again through the second reinforcement piece, make the structural strength of fixed block increase, be difficult for the damage, increase the life of fixed block.

Preferably, the elastic sheet group comprises a plurality of elastic sheets which are stacked, and the upper ends of the elastic sheet group are connected with the plurality of elastic sheets through fasteners. Because the rigidity of shell fragment group is great, the shell fragment group still can play the effect of supporting the back after the atress is crooked, and after withdrawing the power of exerting on the shell fragment group, the shell fragment group can be restored to drive the back of the chair and restore to the throne, connect a plurality of shell fragments through the fastener, make every shell fragment atress even, make convenient, simple structure.

Preferably, the opening of the slot is in a horn mouth shape, so that the upper end of the elastic sheet group can move, the lower end of the elastic sheet group is in interference fit with the bottom of the slot, the first reinforcing sheet is arranged in the first groove in an interference manner, and the second reinforcing sheet is arranged in the second groove in an interference manner. Through setting the opening of slot to the horn mouth form, make the upper end of shell fragment group can be in the opening of slot activity around, the crooked scope of shell fragment group increases to increase the inclination angle of adjustment of back of the chair, the lower extreme of shell fragment group can be spacing to the lower extreme of shell fragment group with the bottom interference fit of slot, prevent that shell fragment group from deviating from in the slot, first reinforcement piece interference setting is in first recess and second reinforcement piece interference setting is in the second recess, can prevent that first reinforcement piece and second reinforcement piece from deviating from in first recess and the second recess.

Preferably, the bottom of the first groove is flush with the bottom of the slot, and the second groove is located at the middle position of the first groove. The bottom of first recess flushes with the bottom of slot to with the lower extreme of shell fragment group apply the power of slot bottom and disperse to whole fixed block through first reinforcement piece, through setting up the second recess at the middle part of first recess, thereby with the stress that receives at the middle part of first recess through second reinforcement piece redispersion, further increase the life of fixed block.

Preferably, the elastic sheet group and the fixed block are both arranged in the connecting sleeve, the fixed block is fixedly connected with the lower part of the connecting sleeve, and the rotating arm is hinged with the upper part of the connecting sleeve through a pin shaft. When the tilting adjusting mechanism is installed, other components are installed by taking the connecting sleeve as a fixed basis, and the installation structure is simple.

Preferably, the connecting sleeve comprises a left connecting plate part, a right connecting plate part and a front side plate part which are connected into a whole, wherein the outer surfaces of the left connecting plate part and the right connecting plate part of the connecting sleeve are respectively provided with a side sealing plate, the side sealing plates are provided with notches, and the side sealing plates are clamped outside the left connecting plate part or the right connecting plate part through the notches, so that the fixing block and the elastic sheet group are limited in the connecting sleeve. The fixing block, the elastic sheet group and the like can be arranged in the connecting sleeve from the rear side of the connecting sleeve, and the parts are limited in the connecting sleeve through the side sealing plates at the two sides.

Preferably, the lower end of the rotating arm is provided with an abutting part, and the rotating arm abuts against the rear part of the upper end of the elastic sheet group through the abutting part. Therefore, the rotating arm and the upper end of the spring plate group can be in running fit with each other without a connecting structure, namely, the spring plate group can be deformed by applying force to the rotating arm, and the spring plate group is reset after the external force is removed, so that the rotating arm is driven to reset.

A chair comprising two chair back recline adjustment mechanisms as described above.

The utility model provides a chair, still includes chair foot rest, back of the chair and seat support, the chair foot rest includes two pairs of preceding chair feet of cross hinge and back chair foot, be equipped with connecting rod A between two preceding chair feet, be equipped with connecting rod B between two back chair feet, the seat support is fixed to be set up on connecting rod A and connecting rod B, and two preceding chair feet are connected with the back of the chair through back of the chair tilting adjustment mechanism respectively, the upper end and the back of the chair of rotating arm are fixed, and the upper end of preceding chair foot is inserted to the lower extreme of fixed block. The chair back tilt angle can be adjusted by inserting, matching and fixing, and is convenient to install, simple and convenient to adjust.

Preferably, the outer surfaces of the joint of the chair back tilting adjusting mechanism and the chair back and the joint of the chair back tilting adjusting mechanism and the front chair legs are covered with the sheath. Like this, adopt the sheath parcel to lean on the back of the chair and lean on the junction of adjustment mechanism and back of the chair and lean on the outside of the junction of adjustment mechanism and preceding chair foot, can not observe the back of the chair, lean on the specific connection structure between adjustment mechanism and the preceding chair foot of back of the chair from outside, the outward appearance is more pleasing to the eye neat, can also play the guard action to back of the chair lean on adjustment mechanism moreover.

The utility model has the following beneficial effects due to the adoption of the technical scheme:

1. the fixing block is lengthened, so that the contact area between the elastic sheet group and the fixing block is increased, only the upper end of the elastic sheet group extends out of the slot, when the lower end of the rotating arm acts on the upper end of the elastic sheet group to bend the elastic sheet group, the acting force of the elastic sheet group to the fixing block is dispersed to the whole fixing block through the first reinforcing sheet and the second reinforcing sheet, and therefore the stress born by the lower part of the fixing block is reduced, and the stress is dispersed again through the second reinforcing sheet, so that the fixing block is not easy to damage, and the service life of the fixing block is prolonged;

2. the upper end of the spring plate group can move back and forth in the opening of the slot by arranging the opening of the slot into a horn mouth shape, and the bending range of the spring plate group is increased, so that the tilting adjustment angle of the chair back is increased;

3. according to the utility model, the lower end of the elastic sheet group is in interference insertion fit with the bottom of the slot, so that the lower end of the elastic sheet group can be limited, and the elastic sheet group is prevented from falling out of the slot; the first reinforcing sheet is in interference fit with the first groove, and the second reinforcing sheet is in interference fit with the second groove, so that the first reinforcing sheet and the second reinforcing sheet are prevented from being separated from the first groove and the second groove respectively;

4. the chair provided by the utility model can realize the tilting adjustment of the chair back only by adjusting the backward force applied when a user leans against the chair back, is simple to use, can automatically reset when the user does not lean against the chair back, and is simple to store.

Drawings

FIG. 1 is a schematic view of the chair according to the present utility model;

FIG. 2 is a partial cross-sectional view of the chair back, front legs, cover and chair back recline mechanism of the present utility model;

FIG. 3 is a schematic view of the chair back recline adjustment mechanism;

FIG. 4 is a schematic view of the side seal plate of FIG. 3 with the side seal plate removed;

FIG. 5 is a schematic view of the structure of FIG. 4 with the connection sleeve removed;

fig. 6 is a schematic structural view of the fixing block.

Reference numerals:

1. a chair back; 2. a seat; 31. front chair legs; 32. rear chair legs; 33. a connecting rod A; 34. a connecting rod B; 41. a rotating arm; 42. a spring plate group; 43. a fixed block; 431. a slot; 432. a first groove; 433. a second groove; 44. connecting sleeves; 45. a side sealing plate; 46. a fastener; 47. a pin shaft; 48. a sheath; 52. a first reinforcing sheet; 52. and a second reinforcing sheet.

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.

For convenience of description, in the present utility model, the direction in which the user sits is referred to as front, and vice versa.

The chair as shown in fig. 1 to 6 comprises a chair foot rest, a chair back 1, a chair seat 2 and two chair back leaning and leaning regulating mechanisms, wherein the chair foot rest comprises two pairs of front chair legs 31 and rear chair legs 32 which are in cross joint, a connecting rod A33 is arranged between the two front chair legs 31, a connecting rod B34 is arranged between the two rear chair legs 32, the chair seat 2 is fixedly arranged on the connecting rod A33 and the connecting rod B34, the two front chair legs 31 are respectively connected with the chair back 1 through the chair back leaning and leaning regulating mechanisms, and the front chair legs 31 and the rear chair legs 32 can relatively rotate to shrink or expand to a certain extent. The outer surface of the joint between the chair back tilting adjustment mechanism and the chair back 1 and the joint between the chair back tilting adjustment mechanism and the front chair legs 31 is covered with a sheath 48, and as a preferable mode, the sheath 48 is a rubber elastic sheath and is used for protecting and shielding the specific connection structure between the chair back tilting adjustment mechanism, the chair back 1 and the front chair legs 31, so that the appearance of the chair is more attractive, and hands or objects of a user can be prevented from being blocked into the chair back tilting adjustment mechanism.

The chair back tilting adjustment mechanism as shown in fig. 2 to 6 comprises a rotating arm 41 connected with a chair back 1, an elastic sheet group 42 and a fixed block 43 connected with a chair foot rest or a chair seat 2, wherein the upper end of the rotating arm 41 is inserted into a cavity of the chair back 1, generally speaking, the upper end of the rotating arm 41 is fixedly connected with the chair back 1, the lower end of the rotating arm 41 acts on the upper end of the elastic sheet group 42, the chair back tilting adjustment mechanism further comprises a first reinforcing sheet 51 and a second reinforcing sheet 52, the fixed block 43 is provided with an upward opening slot 431, the elastic sheet group 42 is arranged in the slot 431, the upper end of the elastic sheet group 42 extends out of the slot 431, the front part of the slot 431 is sequentially provided with a first slot 432 and a second slot 433, the lengths of the slot 431, the first reinforcing sheet 51 is embedded into the first slot 432, the second reinforcing sheet 52 is embedded into the second slot 433, the second reinforcing sheet 52 is abutted against the second reinforcing sheet 52 and the first reinforcing sheet 52.

Thus, in the present utility model, the length of the fixing block 43 is lengthened, when the lower end of the rotating arm 41 acts on the upper end of the elastic sheet group 42 to bend the elastic sheet group 42, the contact area between the elastic sheet group 42 and the fixing block 43 is increased, and the acting force of the elastic sheet group 42 to the fixing block 43 is dispersed to the whole fixing block 43 through the first reinforcing sheet 52 and the second reinforcing sheet 52, so that the stress applied to the lower part of the fixing block 43 is reduced, and the stress is dispersed again through the second reinforcing sheet 52, so that the fixing block 43 is not easy to be damaged, and the service life of the fixing block is prolonged.

In the present utility model, the fixing block 43, the first reinforcing sheet 52 and the second reinforcing sheet 52 are all made of metal.

The elastic sheet set 42 includes a plurality of elastic sheets stacked together, and the upper ends of the elastic sheet set 42 connect the plurality of elastic sheets through fasteners 46. Because the rigidity of the spring plate group 42 is great, the spring plate group 42 still can play the effect of supporting the back after the atress is crooked, and after the withdrawal of the power of exerting on the spring plate group 42, the spring plate group 42 can recover to drive the back of the chair 1 and restore to the throne, connect a plurality of spring plates through fastener 46, make every spring plate atress even, make conveniently, simple structure.

The opening of the slot 431 is in a horn mouth shape, so that the upper end of the elastic sheet group 42 can move, the lower end of the elastic sheet group 42 is in interference fit with the bottom of the slot 431, the first reinforcing sheet 51 is arranged in the first groove 432 in an interference manner, and the second reinforcing sheet 52 is arranged in the second groove 433 in an interference manner. Through setting the opening of slot 431 to the horn mouth form, make the upper end of group of slices 42 can be in the opening of slot 431 back and forth activity, the crooked scope of group of shrapnel 42 increases to increase the inclination angle of adjustment of back of the chair 1, the lower extreme of group of shrapnel 42 and the bottom interference grafting cooperation of slot 431 can carry out spacingly to the lower extreme of group of shrapnel 431, prevents that group of shrapnel 431 from deviating from in the slot. The first reinforcing sheet 51 is interference fit with the first groove 432, and the second reinforcing sheet 52 is interference fit with the second groove 433, thereby preventing the first reinforcing sheet 51 and the second reinforcing sheet 52 from coming out of the first groove 432 and the second groove 433, respectively.

As shown in fig. 6, the bottom of the first groove 432 is flush with the bottom of the slot 431, and the second groove 433 is located at a middle position of the first groove 432. The bottom of the first groove 432 is flush with the bottom of the slot 431, so that the force applied to the slot 431 by the lower end and the front side of the spring plate group 42 is dispersed to the whole fixing block 43 through the first reinforcing sheet 52, and the stress applied to the middle of the first groove 432 is dispersed again through the second reinforcing sheet 52 by arranging the second groove 433 in the middle of the first groove 432, so that the service life of the fixing block 43 is further prolonged.

As shown in fig. 3 to 5, the elastic sheet group 42 and the fixing block 43 are both disposed in the connecting sleeve 44, the fixing block 43 is fixedly connected with the lower portion of the connecting sleeve 44, the rotating arm 41 is hinged with the upper portion of the connecting sleeve 44 through the pin 47, the lower end of the rotating arm 41 is provided with an abutting portion, and the rotating arm 41 abuts against the rear portion of the upper end of the elastic sheet group 42 through the abutting portion. In this way, the rotating arm 41 and the upper end of the elastic sheet group 42 can be in running fit with the elastic sheet group 42 without a connecting structure, the rotating arm 41 rotates around the pin 47 on the upper end of the rotating arm 41, the lower end of the rotating arm 41 applies force to the rear part of the upper end of the elastic sheet group 42 to enable the elastic sheet group 42 to deform forward to abut against the first reinforcing sheet 52, and the elastic sheet group 42 resets after the external force is removed, so that the rotating arm 41 is driven to reset.

The connecting sleeve 44 comprises a left connecting plate part, a right connecting plate part and a front side plate part which are connected into a whole, the outer surfaces of the left connecting plate part and the right connecting plate part of the connecting sleeve 44 are respectively provided with a side sealing plate 45, the side sealing plates 45 are provided with notches, and the side sealing plates 45 are clamped outside the left connecting plate part or the right connecting plate part through the notches, so that the fixing block 43 and the elastic sheet group 42 are limited in the connecting sleeve 44. Thus, the fixing block 43, the elastic sheet group 42 and the like can be installed into the connecting sleeve 44 from the rear side of the connecting sleeve 44, and the parts are limited in the connecting sleeve 44 through the side sealing plates 45 at the two sides.

The chair provided by the utility model can realize the tilting adjustment of the chair back only by adjusting the backward force applied when a user leans against the chair back, is simple to use, can automatically reset when the user does not lean against the chair back, and is simple to store.

All features described in the description, the appended claims and the drawings, either alone or in any combination, are important features of the present utility model.

In the description of the present specification, the descriptions of the terms "one embodiment," "some embodiments," "one implementation," "a particular implementation," "other implementations," "examples," "particular 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 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 above may be combined in any suitable manner in any one or more embodiments, implementations, or examples. The technical scheme disclosed by the utility model also comprises the technical scheme that any one or more specific features, structures, materials or characteristics are formed singly or in combination.

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, variations, deletions of parts, additions of features, or re-combination of features may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model, all such simple modifications, equivalents, and adaptations of the embodiments as may be made by the principles of the utility model and without departing from the scope of the utility model.

Claims (10)

1. The chair back tilting adjusting mechanism comprises a rotating arm (41) used for being connected with a chair back (1), an elastic sheet group (42) and a fixed block (43) used for being connected with a chair foot rest or a chair seat (2), wherein the lower end of the rotating arm (41) acts on the upper end of the elastic sheet group (42), and the chair back tilting adjusting mechanism is characterized by further comprising a first reinforcing sheet (51) and a second reinforcing sheet (52), an upward slot (431) is arranged on the fixed block (43), the elastic sheet group (42) is arranged in the slot (431), the upper end of the elastic sheet group (42) extends out of the slot (431), the front part of the slot (431) is sequentially provided with a first groove (432) and a second groove (433), the lengths of the slot (431), the first groove (432) and the second groove (433) are sequentially reduced, the first reinforcing sheet (51) is embedded in the first groove (432), and the second reinforcing sheet (52) is embedded in the second groove (433), and the second reinforcing sheet (52), the first reinforcing sheet (51) and the elastic sheet (42) are abutted against the second groove (433).

2. The chair back tilting adjustment mechanism according to claim 1, wherein the spring plate group (42) comprises a plurality of spring plates arranged in a stacked manner, and the upper ends of the spring plate group (42) are connected with the plurality of spring plates through fasteners (46).

3. The chair back tilting adjustment mechanism according to claim 1, wherein the opening of the slot (431) is in a horn shape, so that the upper end of the elastic sheet group (42) can move, the lower end of the elastic sheet group (42) is in interference fit with the bottom of the slot (431), the first reinforcing sheet (51) is arranged in the first groove (432) in an interference manner, and the second reinforcing sheet (52) is arranged in the second groove (433) in an interference manner.

4. The reclining chair back adjustment mechanism according to claim 1, wherein the bottom of the first groove (432) is flush with the bottom of the slot (431), and the second groove (433) is located at a middle position of the first groove (432).

5. The chair back tilting adjustment mechanism according to claim 1, wherein the elastic sheet group (42) and the fixed block (43) are both arranged in the connecting sleeve (44), the fixed block (43) is fixedly connected with the lower part of the connecting sleeve (44), and the rotating arm (41) is hinged with the upper part of the connecting sleeve (44) through a pin shaft (47).

6. The chair back tilting adjustment mechanism according to claim 5, wherein the connecting sleeve (44) comprises a left connecting plate part, a right connecting plate part and a front side plate part which are connected into a whole, wherein side sealing plates (45) are respectively arranged outside the left connecting plate part and the right connecting plate part of the connecting sleeve (44), a notch is arranged on each side sealing plate (45), and each side sealing plate (45) is clamped outside the left connecting plate part or the right connecting plate part through the notch, so that the fixing block (43) and the elastic piece group (42) are limited in the connecting sleeve (44).

7. The reclining chair back adjustment mechanism according to claim 1, wherein the lower end of the rotating arm (41) is provided with an abutment portion, and the rotating arm (41) abuts against the rear portion of the upper end of the elastic sheet group (42) through the abutment portion.

8. A chair comprising two chair back recline adjustment mechanisms according to any one of claims 1 to 7.

9. The chair according to claim 8, further comprising a chair foot rest, a chair back (1) and a chair seat (2), wherein the chair foot rest comprises two pairs of front chair legs (31) and rear chair legs (32) which are hinged in a crossed manner, a connecting rod A (33) is arranged between the two front chair legs (31), a connecting rod B (34) is arranged between the two rear chair legs (32), the chair seat (2) is fixedly arranged on the connecting rod A (33) and the connecting rod B (34), the two front chair legs (31) are respectively connected with the chair back (1) through a chair back leaning adjusting mechanism, the upper ends of the rotating arms (41) are fixed with the chair back (1), and the lower ends of the fixing blocks (43) are inserted into the upper ends of the front chair legs (31).

10. A chair according to claim 9, characterized in that the connection between the back recline mechanism and the back (1) and the connection between the back recline mechanism and the front legs (31) are covered with a sheath (48).

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