CN220069255U

CN220069255U - Sliding rail-changing mechanism for chair back

Info

Publication number: CN220069255U
Application number: CN202320598309.XU
Authority: CN
Inventors: 王大秋; 周骏
Original assignee: Zhejiang Motostuhl Furniture Technology Co ltd
Current assignee: Zhejiang Motostuhl Furniture Technology Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-11-24
Anticipated expiration: 2033-03-20

Abstract

The utility model discloses a sliding track-changing mechanism for a chair back, which comprises a chair back main body, a back bracket and a track-changing adjusting assembly arranged between the back main body and the back bracket; the track change adjusting assembly comprises a base, a front supporting piece, a lower linkage piece and an upper linkage piece, wherein the base is connected with the back support, the front supporting piece is positioned in front of the base and is connected with the backrest main body, and the lower linkage piece and the upper linkage piece are connected between the base and the front supporting piece; the front end and the rear end of the lower linkage piece are respectively and rotatably connected with the front supporting piece and the base; the upper linkage piece is positioned above the lower linkage piece, and the front end and the rear end of the upper linkage piece are respectively and rotatably connected with the front support piece and the base; a non-parallelogram four-bar mechanism is formed among the base, the lower linkage piece, the upper linkage piece and the front support piece, and the four-bar mechanism deforms to enable the front support piece to move up and down relative to the base; and the length of the lower linkage piece is longer than that of the upper linkage piece, and the front support piece can incline backwards when the front support piece moves downwards in a linkage manner with the backrest main body so as to enable the backrest main body to lean backwards correspondingly.

Description

Sliding rail-changing mechanism for chair back

Technical Field

The utility model relates to the field of seats, in particular to a sliding rail-changing mechanism for a chair back.

Background

As a living tool which is indispensable for the living and working environment, the chair has higher and higher comfort requirements for the living and working environment, and has obvious requirements for improving the comfort and operability of the chair on the premise of working efficiency.

The chair back of the current general chair is of a structure with fixed integral form, and the lower end of the chair back is connected to the seat of the chair or the chassis; for some reclining chairs, the chair back can rotate backwards around the chassis, and when the chair back rotates backwards, the chair back falls backwards; the back of the chair can be moved relative to the back of the user under the condition of unchanged seat position, so that discomfort is caused; so that the back rubbing problem of people appears. In addition, the chair back can only be switched between a supporting state and a backward tilting state, and in a normal supporting state, the chair back is kept in a fixed state, so that a user feels hard when leaning back on the chair back; when a user actually uses the seat, the back of the user is not kept unchanged, and the front and back positions of the back can be correspondingly changed along with the change of the sitting posture; the chair back of the conventional chair can only longitudinally slide to adjust the height of the chair back at most, but the front and back positions of the chair back are not sliding, so that the chair back can not be effectively attached to the back of a user in the actual use process of the chair back.

Disclosure of Invention

The utility model overcomes the defects in the prior art, and provides the sliding track-changing mechanism for the chair back, and the track-changing adjusting component with the four-bar structure is skillfully arranged between the backrest main body and the back support, so that the backrest main body can slide up and down relative to the back support, and the backrest main body moves downwards and simultaneously leans backwards, so that the back of a user can be better attached; improving the comfort of use.

The technical scheme of the utility model is realized as follows:

a sliding track-changing mechanism of a chair back comprises a chair back main body, a back bracket and a track-changing adjusting component arranged between the back main body and the back bracket; the track change adjusting assembly comprises a base, a front supporting piece, a lower linkage piece and an upper linkage piece, wherein the base is connected with the back support, the front supporting piece is positioned in front of the base and is connected with the backrest main body, and the lower linkage piece and the upper linkage piece are connected between the base and the front supporting piece; the front end and the rear end of the lower linkage piece are respectively and rotatably connected with the front supporting piece and the base; the upper linkage piece is positioned above the lower linkage piece, and the front end and the rear end of the upper linkage piece are respectively and rotatably connected with the front support piece and the base; a non-parallelogram four-bar mechanism is formed among the base, the lower linkage piece, the upper linkage piece and the front support piece, and the four-bar mechanism deforms to enable the front support piece to move up and down relative to the base; and the length of the lower linkage piece is longer than that of the upper linkage piece, and the front support piece can incline backwards when the front support piece moves downwards in a linkage manner with the backrest main body so as to enable the backrest main body to lean backwards correspondingly.

Preferably, the front support moves forward as a whole while the front support moves downward. The four-bar mechanism is characterized in that the four-bar mechanism deforms, so that the position of the backrest main body moves forwards, and the gravity center of a person sitting on the chair moves forwards; the stability of the user during reclining is improved.

Preferably, the front end of the upper linkage member is rotatably connected with the front support member and forms a first upper rotation connection point, and the rear end of the upper linkage member is rotatably connected with the side end of the base and forms a second upper rotation connection point; the front end of the lower linkage piece is rotationally connected with the front support piece and forms a first lower rotation connection point, and the rear end of the lower linkage piece is rotationally connected with the side end of the base and forms a second lower rotation connection point; the second lower rotating connecting point is positioned right below the second upper rotating connecting point; the first upper rotational connection point is located rearward and above the first lower rotational connection point. The four-bar mechanism is non-parallelogram, so that the angle of the front support piece can change when the front support piece moves; the length of the lower linkage piece is longer than that of the upper linkage piece, so that the movement distance of the lower end of the front support piece in the front-rear direction is longer than that of the upper end of the front support piece in the front-rear direction, and the front support piece can incline backwards at the same time when the front support piece moves downwards and forwards.

Preferably, when the front support is at the highest height position, the upper linkage member and the lower linkage member incline backward and downward from front to back.

Preferably, the angle of the back rest main body is between 5 and 12 degrees when the back rest main body moves downwards.

Preferably, the backrest main body is of a frame structure in a shape of a Chinese character 'kou', the lower end of the backrest main body is provided with a lower support cross rod, the middle position of the lower support cross rod is provided with a mounting part, and the rear end of the mounting part is concavely provided with a mounting groove; the front support piece is provided with a longitudinal connecting vertical plate which is embedded in the mounting groove and connected with the backrest main body by adopting screws. Thus, when the back elevation angle of the front supporting piece is changed, the back elevation angle of the backrest main body is also changed.

Preferably, the front support piece is of a longitudinally arranged U-shaped structure, and the front support piece further comprises side connecting plates respectively positioned at two sides of the connecting vertical plate; the front end of the upper linkage piece and the front end of the lower linkage piece are respectively connected with the side connecting plates in a rotating way.

Preferably, a limiting mechanism is further arranged between the lower linkage piece and the base, and comprises an arc-shaped limiting groove arranged on one of the lower linkage piece or the base and a limiting protrusion which is correspondingly arranged on the other of the lower linkage piece or the base and is positioned in the limiting groove. The range of up-and-down movement of the front support can be limited, so that the structure is more stable.

Preferably, the locking mechanism comprises a positioning bolt which is arranged on the base and can be horizontally inserted and pulled out, and the upper linkage piece is provided with a first lock hole and a second lock hole which are spaced; the front support piece can be selectively inserted into the first lock hole and the second lock hole in the process of moving up and down relative to the base. Then under these two positions, can all be in order to lock the track change adjusting part through inserting horizontal bolt to make preceding support piece and back main part be in the locked state, realize the locking and the unblock of back main part, it is more convenient to adjust.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

according to the sliding track-changing mechanism for the chair back, the movable adjustment of the backrest main body is realized by arranging the track-changing adjusting component between the backrest main body and the backrest bracket; the track-changing adjusting component is of a four-bar structure and of a non-parallelogram structure; the angle of the front supporting piece can be changed (namely, the front supporting piece is inclined backwards) except downwards and forwards in the process of downwards moving the front supporting piece relative to the base; therefore, in the process that the backrest main body slides downwards relative to the backrest bracket, the backrest main body is simultaneously leaned backwards to increase the backward angle of the backrest main body, and the action that a user leans backwards on the backrest main body can be adapted, so that the backrest main body can be more attached to the back of the user; thereby making the user feel comfortable and increasing the comfort of use.

Drawings

FIG. 1 is a side view of a back body assembled with a back bracket in an embodiment of the present utility model;

FIG. 2 is a side view of the utility model with the back body moved downward relative to the back bracket in an embodiment;

FIG. 3 is a schematic perspective view of the connection of the backrest body, the track change adjusting assembly and the backrest bracket in an embodiment of the utility model;

FIG. 4 is a schematic perspective view of a track change adjusting assembly according to an embodiment of the present utility model;

FIG. 5 is a side view of the rail adjustment assembly with the front support at the highest elevation in an embodiment of the utility model;

fig. 6 is a side view of the variable rail adjustment assembly of the present utility model with the front support moved downward in an embodiment.

The reference numerals are as follows: a backrest main body 1; a lower support rail 101; a back support 2; a track change adjusting assembly 3; a base 4; a front support 5; a connecting vertical plate 501; a side connection plate 502; a lower link 6; an upper link 7; a first upper rotational connection point a; a second upper rotational connection point b; a first lower rotational connection point c; a second lower rotational connection point d; a mounting groove 8; a limit groove 9; a limit protrusion 10; positioning a bolt 11; a first lock hole 12; a second locking hole 13.

Description of the embodiments

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, the term "at least one" refers to one or more, unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific embodiments of the present utility model are as follows:

as shown in fig. 1 to 6, the present utility model provides a sliding track change mechanism for a seatback, which includes a seatback main body 1, a back bracket 2, and a track change adjusting assembly 3 provided therebetween; the track change adjusting assembly 3 comprises a base 4 connected with the back bracket 1, a front supporting piece 5 positioned in front of the base 4 and connected with the backrest main body 1, and a lower linkage piece 6 and an upper linkage piece 7 connected between the base 4 and the front supporting piece 5; and a non-parallelogram four-bar linkage is formed among the base 4, the lower linkage 6, the upper linkage 7 and the front support 5, the deformation of the four-bar linkage enables the front support 5 to slide up and down relative to the base 4, and the front support 5 moves forwards integrally while the front support 5 links the backrest main body 1 downwards, and the front support 5 itself tilts backwards to enable the backrest main body 1 to recline correspondingly. So that when a user leans against the backrest main body 1, the backrest main body 1 can be further acted to move downwards, and the backrest main body 1 can be further leaned backwards by a certain angle to better fit the back of the user; improving the comfort of use.

As shown in fig. 3-6, the backrest main body 1 is of a frame structure in a shape of a Chinese character kou, the lower end of the backrest main body 1 is provided with a lower support cross rod 101, an installation part protruding upwards is arranged at the middle position of the lower support cross rod 101, and an installation groove 8 is concavely arranged at the rear end of the installation part; the front support piece 5 is of a longitudinally arranged U-shaped structure, the front support piece 5 comprises a longitudinal connecting vertical plate 501, and the connecting vertical plate 501 is embedded in the mounting groove 8 and is connected with the mounting part by adopting a screw; so that the backrest main body 1 and the front support 5 keep synchronous movement, and when the back elevation angle of the front support 5 is changed, the back elevation angle of the backrest main body 1 can be correspondingly changed. In addition, the base 4 is longitudinally connected and fixed on the back support 2, and then the track-changing adjusting assembly 3 can effectively realize movable adjustment of the back support main body 1 relative to the back support 2.

As shown in fig. 4-6, the lower linkage member 6 and the upper linkage member 7 are arranged at the left side and the right side of the front support member 5 and the base 4 in a mirror image manner, so that the structure of the track change adjusting assembly 3 is stable; specifically: the front support 5 further comprises side connection plates 502 located at two sides, the front end of the upper linkage 7 is rotatably connected with the side connection plates 502 to form a first upper rotation connection point a, and the rear end of the upper linkage 7 is rotatably connected with the side end of the base 4 to form a second upper rotation connection point b; the lower linkage member 6 is located below the upper linkage member 7, the front end of the lower linkage member 6 is rotatably connected with the side connecting plate 502 to form a first lower rotation connecting point c, and the rear end of the lower linkage member 6 is rotatably connected with the side end of the base 4 to form a second lower rotation connecting point d. As shown in fig. 5, when the front support 5 is at the highest height position, both the upper and lower links 7 and 6 incline downward and rearward from front to rear. And, the length of the lower linkage 6 is longer than that of the upper linkage 7, so that the four-bar linkage is a non-parallelogram structure, and the angle of the front support 5 is changed when it moves; the second lower rotation connection point d is positioned right below the second upper rotation connection point b; the first upper rotating connecting point a is positioned at the rear upper part of the first lower rotating connecting point c; then when the front support 5 moves downwards relative to the base 4, the four-bar mechanism correspondingly deforms, so that the front support 5 moves downwards and forwards; since the length of the lower linkage member 6 is longer than that of the upper linkage member 7, the movement distance of the lower end of the front support member 5 in the front-rear direction is longer than that of the upper end of the front support member 5 in the front-rear direction, and then as shown in fig. 6, the front support member 5 is inclined backward at the same time while the front support member 5 moves downward and forward; thus, as shown in fig. 1-2, in the process of sliding the backrest main body 1 downwards relative to the backrest bracket 2, the backward angle of the backrest main body 1 is increased, so that the action of a user leaning back on the backrest main body 1 can be adapted, and the backrest main body 1 can be more attached to the back of the user; and the angle of the back main body 1 is between 5 and 12 degrees.

In addition, a limiting mechanism is arranged between the lower linkage piece 6 and the base 4, and comprises an arc-shaped limiting groove 9 arranged on the lower linkage piece 6 and a limiting protrusion 10 arranged on the base 4 and positioned in the limiting groove; the limiting protrusion 10 is limited to move in the limiting groove 9, so that the range of up-and-down movement of the front support 5 can be limited, and the structure is more stable. In addition, a positioning bolt 11 capable of being horizontally inserted and pulled out is further arranged on the base 4, and a first lock hole 12 and a second lock hole 13 which are spaced are arranged on the upper linkage piece 7; as shown in fig. 5, when the front supporter 5 is at the highest level, the positioning pin 11 can be inserted into the first locking hole 12; as shown in fig. 6, after the front support 5 slides down relative to the base 4, the positioning pin 11 can be inserted into the second locking hole 13; then under these two positions, can all be through inserting horizontal bolt in order to lock the track change adjusting part 3 to make preceding support piece 5 and back main part 1 be in the locked state, realize the locking and the unblock of back main part 1, it is more convenient to adjust.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. A slip track change mechanism for back of chair, its characterized in that: comprises a backrest main body, a backrest bracket and a track-changing adjusting component arranged between the backrest main body and the backrest bracket; the track change adjusting assembly comprises a base, a front supporting piece, a lower linkage piece and an upper linkage piece, wherein the base is connected with the back support, the front supporting piece is positioned in front of the base and is connected with the backrest main body, and the lower linkage piece and the upper linkage piece are connected between the base and the front supporting piece; the front end and the rear end of the lower linkage piece are respectively and rotatably connected with the front supporting piece and the base; the upper linkage piece is positioned above the lower linkage piece, and the front end and the rear end of the upper linkage piece are respectively and rotatably connected with the front support piece and the base; a non-parallelogram four-bar mechanism is formed among the base, the lower linkage piece, the upper linkage piece and the front support piece, and the four-bar mechanism deforms to enable the front support piece to move up and down relative to the base; and the length of the lower linkage piece is longer than that of the upper linkage piece, and the front support piece can incline backwards when the front support piece moves downwards in a linkage manner with the backrest main body so as to enable the backrest main body to lean backwards correspondingly.

2. The sliding track-change mechanism for a seat back of claim 1, wherein: the front support moves downward while the front support moves forward as a whole.

3. The sliding track-change mechanism for a seat back of claim 1, wherein: the front end of the upper linkage piece is rotationally connected with the front support piece to form a first upper rotation connection point, and the rear end of the upper linkage piece is rotationally connected with the side end of the base to form a second upper rotation connection point; the front end of the lower linkage piece is rotationally connected with the front support piece and forms a first lower rotation connection point, and the rear end of the lower linkage piece is rotationally connected with the side end of the base and forms a second lower rotation connection point; the second lower rotating connecting point is positioned right below the second upper rotating connecting point; the first upper rotational connection point is located rearward and above the first lower rotational connection point.

4. A sliding track-change mechanism for a seat back as in claim 1 or 3, wherein: when the front support piece is at the highest height position, the upper linkage piece and the lower linkage piece incline downwards and backwards.

5. The sliding track-change mechanism for a seat back of claim 1, wherein: in the downward movement process of the backrest main body, the backward tilting angle of the backrest main body is between 5 and 12 degrees.

6. The sliding track-change mechanism for a seat back of claim 1, wherein: the backrest main body is of a square frame structure, the lower end of the backrest main body is provided with a lower support cross rod, the middle position of the lower support cross rod is provided with a mounting part, and the rear end of the mounting part is concavely provided with a mounting groove; the front support piece is provided with a longitudinal connecting vertical plate which is embedded in the mounting groove and connected with the backrest main body by adopting screws.

7. The sliding track-change mechanism for a seat back of claim 6, wherein: the front support piece is of a U-shaped structure which is longitudinally arranged, and the front support piece also comprises side connecting plates which are respectively positioned at two sides of the connecting vertical plate; the front end of the upper linkage piece and the front end of the lower linkage piece are respectively connected with the side connecting plates in a rotating way.

8. The sliding track-change mechanism for a seat back of claim 1, wherein: and a limiting mechanism is further arranged between the lower linkage piece and the base, and comprises an arc-shaped limiting groove arranged on one of the lower linkage piece or the base and a limiting protrusion which is correspondingly arranged on the other one of the lower linkage piece or the base and is positioned in the limiting groove.

9. The sliding track-change mechanism for a seat back of claim 1, wherein: the locking mechanism comprises a positioning bolt which is arranged on the base and can be horizontally inserted and pulled out, and a first lock hole and a second lock hole which are spaced are arranged on the upper linkage piece; the front support piece can be selectively inserted into the first lock hole and the second lock hole in the process of moving up and down relative to the base.