CN213128727U

CN213128727U - Seat with three-back structure

Info

Publication number: CN213128727U
Application number: CN202022480210.9U
Authority: CN
Inventors: 朱月新
Original assignee: Zhejiang Kemi Bear Technology Co ltd
Current assignee: Zhejiang Kemi Bear Technology Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-05-07
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a chair with a three-back structure, which comprises a base, a chair column and a chair back component connected with the chair column; the chair back component comprises a bracket, an upper chair back and a lower chair back which are connected with the bracket and are separated up and down; the support is provided with a supporting longitudinal rod and two supporting transverse rods which are oppositely arranged; the upper chair back is connected to the vertical supporting rod in a sliding manner, and the upper chair back slides up and down along the vertical supporting rod to adjust the height of the upper chair back; the lower chair backs are respectively connected to the two supporting cross rods in a sliding manner, and the two lower chair backs slide left and right along the respectively connected supporting cross rods so as to adjust the width of the chair back assembly; a lifting adjusting device is arranged between the bracket and the chair column, the lifting adjusting device comprises a supporting piece which is sleeved on the chair column in a sliding manner, and the rear end of the bracket is fixedly connected with the supporting piece; the bracket slides up and down along the chair column to adjust the height of the upper chair back and the lower chair back simultaneously. The lower chair back and the upper chair back of the chair independently support the waist and the back of a human body, and the chair is more in line with human engineering.

Description

Seat with three-back structure

Technical Field

The utility model relates to a thing to sit on field, in particular to seat of three back structures.

Background

The chair is a necessity for life and work of people, is widely used in places such as families, offices, meeting rooms, libraries, schools, hotels and the like, and provides a convenient and comfortable seat for life, work, study, accommodation and the like of people. The chairs on the market either have no adjusting function or only have the function of adjusting the height; however, the chair which can only adjust the height can not play a good role in protecting the spine of the human body; in the back structure of a human body, the back and the waist are generally in an inverted triangle shape, the width of the back is larger than that of the waist, and the upper part of the triangle is heavier than the lower part, so that pressure is felt to downwards reach the lumbar of the human body; because the backrest of the chair in the market is fixed and cannot effectively support the direct downward pressure of the lumbar of a human body, the chair can cause certain damage to the spine of the body after long-term use; since the seats on the market can not be properly adjusted according to users, the sitting posture of the users can be incorrect, and adverse effects can be brought to the bodies of the users; the main manifestations are as follows: 1) due to the fact that the desktop is too low, a user needs to lie on the desktop to cause myopia; 2) Long-term bending over to cause excessive strain on the neck; 3) the spine is pressed due to the improper body of the table and the chair, so that the stoop and humpback are formed; 4) the unsmooth blood flow and insufficient oxygen supply to the brain caused by hanging two feet in the air lead to low work and study efficiency.

In order to overcome the above-mentioned drawbacks of the chair back, various double-back chair seats have been designed in the prior art; the double-back chair seat is characterized in that the chair back comprises two oval back plates, the two back plates are connected by an arc bent pipe, a certain gap is formed between the two back plates, the connecting parts of the back plates and the bent pipe are made of elastic materials, therefore, when the two back plates are extruded by external force, the back plates can rotate at a certain angle clockwise or anticlockwise by taking a supporting point as a circle center, inwards or outwards, and the two back plates just like two doors which can be opened inside and outside simultaneously. The double-chair back chair designed in the way is more in line with the principle of human engineering, because when a person sitting on the chair leans backwards on the chair back, the two back plates respectively rotate clockwise and anticlockwise, the part close to the spine of the person faces backwards, and the other two sides face forwards, so that the whole chair back is in an encircling shape, and the pressure on the spine is reduced; compared with the traditional single-backrest chair, the back of a human body can be supported in a larger area, the back pressure is reduced, and the chair is also more fit with the back when being used. However, although the double-back chair can support the back of a human body in a larger area than a single-back chair, since a person sitting on the chair mainly depends on the upper part of the chair backs, the two chair backs are required to be designed to be longer, and the cost is higher; the double-back seat also has limited lumbar support to the human body, and a large distance is left between the lumbar of the human body and the chair back without obtaining support; therefore, the weight of the upper body cannot be completely dispersed, and the long-time sitting of the patient can cause soreness and backache of the waist and even lateral bending of the spine.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a chair with a three-back structure, the chair back assembly of the chair has an upper chair back and a lower chair back which are separated up and down; when the chair is used, the two lower back chairs support the waist of a human body independently, and the upper back chair supports the back of the human body; the waist support effect on the human body is better, the chair better accords with human engineering mechanics, and the human body is more comfortable to use; the upper chair back and the lower chair back can be adjusted to lift along with the bracket at the same time, the upper chair back can be independently adjusted to lift, and the two lower chair backs can be adjusted to move left and right; can adapt to different user groups, and is more humanized in use

The technical scheme of the utility model is realized like this:

a chair with a three-back structure comprises a base, a chair column and a chair back component connected to the chair column; the chair back component comprises a bracket, an upper chair back and a lower chair back which are connected to the bracket and are separated from each other up and down; the support is provided with a supporting longitudinal rod and two supporting transverse rods which are oppositely arranged; the upper chair back is connected to the supporting longitudinal rod in a sliding mode, and the upper chair back slides up and down along the supporting longitudinal rod to adjust the height of the upper chair back; the two lower chair backs are separately arranged and are respectively connected to the two supporting cross rods in a sliding manner, and the two lower chair backs slide left and right along the respectively connected supporting cross rods so as to adjust the width of the chair back assembly; a lifting adjusting device is arranged between the bracket and the chair column, the lifting adjusting device comprises a supporting piece which is sleeved on the chair column in a sliding manner, and the rear end of the bracket is fixedly connected with the supporting piece; the bracket slides up and down along the chair column to adjust the height of the upper chair back and the lower chair back simultaneously.

Preferably, after the upper chair back and the lower chair back are connected with the bracket, the upper chair back and the lower chair back are both in an inclined state, and the lower chair back protrudes forward compared with the upper chair back. The lower chair back protrudes forwards from the upper chair back, so that the chair back component is more attached to the S-shaped spine of a human body, and the supporting effect is better.

Preferably, the support is of a 'soil' -shaped structure, and the two supporting transverse rods are arranged on the left side and the right side of the lower end of the supporting longitudinal rod; connecting rods extend out of the two sides of the supporting longitudinal rod respectively, and the connecting rods are fixedly connected with the supporting piece; the connecting rod is positioned above the supporting cross rod.

Preferably, a lifting mechanism is arranged between the upper chair back and the supporting longitudinal rod, and the lifting mechanism comprises a sliding supporting block arranged on one of the supporting longitudinal rod or the upper chair back and a first sliding groove arranged on the other of the supporting longitudinal rod or the upper chair back; the upper chair back and the supporting longitudinal rod are in front-back butt joint so that the sliding supporting block is in sliding fit with the first sliding groove.

Preferably, the sliding support block is arranged on the support longitudinal rod, and the first sliding groove is correspondingly arranged on the back surface of the upper chair back; a gear adjusting mechanism is also arranged between the upper chair back and the supporting longitudinal rod, and comprises elastic glass beads arranged on the supporting longitudinal rod and positioning grooves longitudinally distributed on the back of the upper chair back; the upper chair back slides relative to the supporting longitudinal rod, and the elastic glass beads are clamped and matched with the positioning grooves to realize the gear lifting adjustment of the upper chair back.

Preferably, the back of the lower chair back is provided with a sliding block, the supporting cross rod is correspondingly provided with a transverse second sliding groove, and the sliding block is in sliding fit with the second sliding groove; a cam wrench is connected to the sliding block to limit the sliding block to be separated from the second sliding chute; the cam on the cam spanner is hinged with the sliding block; the cam wrench is rotated to realize the sliding locking and unlocking between the lower chair back and the support cross rod.

Preferably, in a locking state, the cam wrench is buckled on the supporting cross rod, a cam on the cam wrench is in press fit with the bracket, and the bracket and the chair back are kept relatively fixed; under the unblock state, rotate the cam spanner so that the cam no longer extrudees and acts on the support, the cam spanner outwards overturns and opens, and the back of the chair can be followed and supported horizontal pole horizontal slip.

Preferably, the lifting adjusting device further comprises an inserting column, a slot and a control switch, wherein the inserting column, the slot and the control switch are matched in an inserting mode; the inserting columns are arranged in the supporting piece in a bilateral symmetry mode, and the inserting grooves are correspondingly and longitudinally arranged on the chair columns; the control switch can move relative to the support piece, the moving direction of the control switch is perpendicular to the moving direction of the inserting column, and the inserting column is withdrawn from or inserted into the slot in response to the action of the control switch.

Preferably, the ends, close to each other, of the two insertion columns are respectively provided with a guide block, and a spring is connected between the two guide blocks; the control switch is provided with a guide groove with an upward opening, and two symmetrical bevel edges are arranged in the guide groove; the lower ends of the two guide blocks are positioned in the guide grooves, and the two guide blocks are respectively abutted against the two oblique edges; the lower end of the control switch is exposed out of the supporting piece, the control switch moves relative to the supporting piece, and the two guide blocks are close to each other and drive the two inserting columns to leave the inserting grooves.

Preferably, two bilaterally symmetrical chair columns are arranged on the base; the support piece is in a dumbbell shape and comprises a connecting part which is transversely arranged and sliding parts which are respectively positioned at two ends of the connecting part; the inserted column is transversely arranged in the connecting part; the sliding part is sleeved on the chair column in a sliding mode, and the front end of the sliding part is provided with a connecting arm connected and fixed through a connecting rod.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

1, the chair back component is arranged into an upper chair back and a lower chair back which are separated from each other up and down, so that when a user depends on the chair, the upper chair back is used for supporting the back of a human body, and the two lower chair backs support the waist of the human body, so that the overall supporting effect of the chair is better; the lower chair back protrudes forwards and the upper chair back, so that the lower chair back conforms to the S-shaped spine of a human body; the lumbar support has a good supporting effect on the waist of a human body, and the pressure of the spine is relieved; can correct the sitting posture of the human body and is more in accordance with the human engineering mechanics.

2, the upper chair back and the lower chair back are both connected to a bracket, and the bracket can slide up and down along the chair column for adjustment; the upper chair back is connected with the supporting longitudinal rod on the bracket in a sliding manner, and the upper chair back can slide up and down to adjust the height of the chair back component; the two lower chair backs can slide left and right to adjust the width of the chair back component; the chair can be suitable for people with different heights and body types; the application is more humanized.

3, the connecting structures between the upper chair back and the supporting longitudinal rods and between the lower chair back and the supporting transverse rods are simple, so that the chair cost can be effectively reduced; the upper chair back and the supporting longitudinal rod are attached front and back, and the connecting structure is shielded between the upper chair back and the supporting longitudinal rod; the lower chair back is connected with the supporting cross rod, and the cam wrench covers the supporting cross rod; the whole seat is simple and beautiful, and the modern aesthetic requirement is better met.

4, when the upper chair back is adjusted, the upper chair back can be adjusted in a gear way only by applying force to the upper chair back in the vertical direction and contracting the elastic glass beads; when the lower chair back is adjusted, only the cam wrench needs to be rotated; the support can be adjusted to lift only by installing a control switch; the operation of the seat is very convenient and simple, and the use is more rapid and convenient.

Drawings

Fig. 1 is a schematic perspective view of a seat according to an embodiment of the present invention;

fig. 2 is a side view of a seat in an embodiment of the invention;

FIG. 3 is a side view of a chair back assembly in an embodiment of the present invention;

FIG. 4 is a rear view of a chair back assembly in an embodiment of the present invention;

fig. 5 is a schematic perspective view of the connection between the upper chair back and the bracket according to the embodiment of the present invention;

fig. 6 is a schematic perspective view of the back frame and the supporting vertical rods according to the embodiment of the present invention;

fig. 7 is a schematic perspective view of a bracket according to an embodiment of the present invention;

fig. 8 is a rear view of an upper chair back in an embodiment of the present invention;

fig. 9 is a schematic perspective view of the lower back and the support rail according to the embodiment of the present invention;

fig. 10 is a schematic perspective view of the connection between the lower backrest and the support rail according to the embodiment of the present invention;

fig. 11 is a schematic perspective view of the embodiment of the present invention showing the engagement between the slider and the cam wrench;

fig. 12 is a schematic perspective view of the back of the bracket according to the embodiment of the present invention;

FIG. 13 is a schematic perspective view of the connection between the support and the seat pillar in the embodiment of the present invention;

fig. 14 is a schematic perspective view of an embodiment of the lifting adjusting device of the present invention;

fig. 15 is a schematic perspective view of the embodiment of the present invention showing the cooperation between the insertion post and the control switch.

The figures are numbered: a base A; a chair column B; a seatback assembly C; a bracket 1; an upper chair back 2; a lower chair back 3; a supporting longitudinal rod 4; a support rail 5; a connecting rod 6; a front and back frame 7; a back frame 8; a slide connection base 9; a sliding support block 10; a first chute 11; a connecting plate 12; an elastic glass bead 13; a connecting column 13 a; a bead head 13 b; a positioning groove 14; a connecting hole 15; a slider 16; a second chute 17; a mounting groove 18; a connecting seat 19; a cam wrench 20; a cam 21; a barrier strip 38; the mounting groove 22 is rotated; a first through hole 23; a second through hole 24; a perforation 25; a support 26; a connecting portion 26 a; a sliding portion 26 b; a connecting arm 27; the insert post 28; a slot 29; a control switch 30; a stopper portion 301; a guide block 31; a mounting seat 32; a spring 33; the guide groove 34; a beveled edge 35; a lower cover 36; avoiding the groove 37.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

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

In the description of the present invention, the term "at least one" means 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 present embodiment is described with reference to the orientation of the components, such as front, rear, etc., in a state where the user normally uses the seat after sitting.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-15, the utility model provides a chair with a three-back structure, which comprises a base a, a chair column B and a chair back component C connected with the chair column B; the chair column B is longitudinally arranged and is fixedly connected to the base A; the chair back component C comprises a bracket 1, an upper chair back 2 and a lower chair back 3 which are vertically separated, and the two lower chair backs 3 are separately arranged; the upper chair back 2 and the lower chair back 3 are both connected to the bracket 1; the bracket 1 is connected to the chair column B in a sliding manner, and then the bracket 1 can slide along the chair column B to adjust the heights of the upper chair back 2 and the lower chair back 3 simultaneously; the upper chair back 2 is connected to the bracket 1 in a sliding manner, so that the upper chair back 2 can be independently lifted and lowered to adapt to users with different heights; the lower chair backs 2 are connected to the left side and the right side of the lower end of the support 1, the lower chair backs 2 can slide left and right along the support 1, and the two lower chair backs 2 are adjusted to adjust the width of the chair back component C, so that the chair back component C is suitable for users with different body types and is more humanized in use; the lower chair backs 2 and the upper chair backs 3 are vertically separated, so that the two lower chair backs 2 independently support the waist of a user, and the protection effect on the waist of a human body is better; therefore, the chair with the three-back structure is more in accordance with human engineering mechanics and more humanized in use.

As shown in fig. 1-4, the support 1 is a frame structure in a shape of a Chinese character 'tu', the support 1 is provided with a longitudinally arranged supporting longitudinal rod 4, and the lower end of the supporting longitudinal rod 4 is symmetrically provided with supporting cross rods 5 towards the left and right sides; a connecting rod 6 connected with the chair column B extends above the supporting cross rod 5 along the left and right sides of the supporting longitudinal rod 4; and the length of the connecting rod 6 is shorter than that of the supporting cross rod 5; the upper chair back 2 is connected on the supporting longitudinal rods 4 in a sliding mode, and the two lower chair backs 3 are respectively connected on the two supporting transverse rods 5 in a sliding mode.

As shown in fig. 5 to 8, the upper chair back 2 and the vertical supporting rod 4 are connected in the following manner: the upper chair back 2 comprises a front back frame 7 and a back frame 8, the front back frame 7 and the back frame 8 are fixedly connected through screws, and during installation, the back frame 8 is in sliding fit with the supporting longitudinal rod 4, and then the front back frame 7 is fixedly connected with the back frame 8; specifically, the method comprises the following steps: the upper end of the supporting longitudinal rod 4 is provided with a sliding connecting seat 9; the sliding connection seat 9 is positioned above the connecting rod 6, two ends of the sliding connection seat 9 are respectively provided with a sliding support block 10, and the sliding support blocks 10 protrude forwards from the bracket 2; two first sliding grooves 11 are correspondingly and longitudinally arranged on the back frame 8, the two first sliding grooves 11 are arranged in bilateral symmetry, and the distance between the two first sliding grooves 11 is equal to the distance between the two sliding support blocks 10; then, when the seat assembly 1 is connected with the bracket 2, the back frame 8 is in front-back butt joint with the bracket 2, so that the two sliding support blocks 10 are respectively positioned in the two first sliding grooves 11; after the sliding support block 10 is in sliding fit with the first chute 11, a connecting plate 12 connected with the sliding support block 10 is arranged between the back frame 8 and the front back frame 7; the connecting plate 12 is fixedly connected with the sliding support block 10 through screws; the sliding support block 10 is connected with the connecting plate 12 to effectively limit the sliding support block 10 to be separated from the first chute 11; the connection between the upper chair back 2 and the supporting vertical rod 4 is more stable, and then the upper chair back 3 can independently slide up and down along the supporting vertical rod 4.

A gear adjusting mechanism is also arranged between the upper chair back 3 and the supporting longitudinal rod 4, and comprises elastic glass beads 13 arranged on the sliding connection seat 9 and positioning grooves 14 longitudinally distributed on the back frame 8; specifically, the method comprises the following steps: a connecting hole 15 is further formed in the middle of the sliding connecting seat 9, and the elastic glass bead 13 comprises a connecting column 13a and a bead head 13b positioned at the end part of the connecting column; the elastic glass beads 13 are arranged in the connecting holes 15, the connecting columns 13a on the elastic glass beads 13 are inserted into the connecting holes 15, and springs are arranged between the connecting columns 13a and the hole bottoms of the connecting holes 15, so that the bead heads 13b can elastically stretch out and draw back; the bead head 13b is exposed out of the sliding connection seat 9, and the bead head 5 is extruded to be contracted in the connection hole 15; the positioning grooves 14 are located in the middle of the two first sliding chutes 11, and the positioning grooves 14 are arranged in close proximity in the longitudinal direction; then, after the back frame 8 is in sliding fit with the supporting longitudinal rod 4, the elastic glass beads 13 are clamped between the back frame 8 and the support 2, and the bead heads 5 are just clamped with the positioning grooves 14; at the moment, the back frame 8 and the supporting longitudinal rod 4 are in sliding fit, and then the front back frame 7 and the back frame 8 are connected and fixed through screws.

In addition, when a user leans on the upper chair back 2, the back of the human body exerts backward pressure on the upper chair back 2, so that the back frame 8 and the supporting longitudinal rod 4 are mutually extruded, and friction force is generated between the back frame and the supporting longitudinal rod; the bead head 13b of the elastic glass bead 13 is clamped in the positioning groove 14; so that the connection between the back frame 8 and the supporting longitudinal rod 4 is tight; the upper chair back 2 can not be loosened from the supporting longitudinal rod 4 in the using process; the upper chair back 2 can be fixed and stopped at a set position; when the height of the chair back is adjusted, a user leaves the upper chair back 2 and applies force to the upper chair back 2 in the vertical direction, so that the elastic glass beads 13 elastically contract, and then the upper chair back 2 can slide along the supporting longitudinal rods 4; the structural design is more reasonable. The upper chair back 2 and the supporting longitudinal rod 4 adopt the connecting structure, the upper chair back 2 can be independently adjusted to be lifted relative to the bracket 2 through the matching of the sliding supporting block 10 and the first sliding groove 11, the lifting adjusting device can adapt to people with different body lifting, the structure is simple and effective, and the cost is effectively saved; through the cooperation between elasticity glass bead 13 and the constant head tank 14 for go up back of the chair 2 in the lift adjustment in-process, the gear sense is very obvious, has a plurality of gears to adjust, adjusts and feels, and the location is accurate.

As shown in fig. 9-12, the lower back 3 and the support bar 5 are connected as follows: a sliding block 16 is arranged on the back of the lower chair back 3, a transverse second sliding groove 17 is correspondingly arranged on the supporting cross rod 5, and the second sliding groove 17 is arranged along the length direction of the supporting cross rod 5; after the sliding block 16 is in sliding fit in the second sliding groove 17; a cam wrench 20 is connected to the sliding block 16 to limit the sliding block 16 to be separated from the second sliding groove 17, and the locking and unlocking between the lower chair back 3 and the support cross rod 5 can be controlled through the cam wrench 20; specifically, the method comprises the following steps: the back of the lower chair back 3 is provided with an installation groove 18, and a connecting seat 19 is fixedly connected in the installation groove 18 through a screw; the slide block 16 is arranged on the rear end face of the connecting seat 19, and the slide block 16 protrudes backwards out of the connecting seat 19; the second sliding groove 17 penetrates through the support cross rod 5 from front to back; as shown in fig. 10 and 12, the aperture of the end of the second sliding groove 17 close to the lower chair back 3 is smaller than the aperture of the end of the second sliding groove 17 far from the chair back, so that an upper barrier strip 38 and a lower barrier strip 38 are formed on one side of the second sliding groove 17 close to the lower chair back 3; when the lower chair back 3 is connected with the support cross rod 5, the sliding block 16 is inserted into the second sliding groove 17, the upper end and the lower end of the sliding block 16 are respectively abutted to the two barrier strips 38, and then the sliding block 16 can stably slide along the barrier strips 38 and cannot shake.

A rotating installation groove 22 matched with the sliding block 16 is arranged on a cam 21 of the cam wrench 20; after the lower chair back 3 is connected with the support cross rod 5, the sliding block 16 is positioned in the second sliding groove 17; then the cam 21 is hinged with the slider 16, and the specific hinge mode is as follows: a first through hole 23 penetrates through the cam 21 from top to bottom, and a second through hole 24 penetrates through the slider 16 from top to bottom; connecting the cam 21 with the slider 16 to enable the slider 16 to be positioned in the rotating mounting groove 22 and enable the hole positions of the first through hole 23 and the third through hole 24 to be aligned up and down; as shown in fig. 12, a through hole 25 is correspondingly formed at the lower end of the support cross bar 5, and the through hole 25 penetrates through the second sliding chute 17; when the device is installed, the through hole 25 is vertically aligned with the hole positions of the first through hole 23 and the second through hole 24, then a rotating shaft penetrates through the through hole 25 from the lower end of the supporting cross rod 5 and then is continuously arranged in the first through hole 23 and the second through hole 24 in a penetrating manner, and then the sliding block 16 is hinged with the cam 21 on the cam wrench 20; after the rotating shafts are connected, the rotating shafts are all positioned in the cam 21 and the sliding block 16 and are not connected with the supporting cross rod 5; after the sliding block 16 is hinged to the cam wrench 20, the cam 21 abuts against the barrier strip 38 to limit the sliding block 16 to be separated from the second sliding groove 17, so that the lower chair back 3 is always connected to the supporting cross rod 5.

By this connection structure, the cam wrench 20 is then caused to have the locked state and the unlocked state; in a locked state, the lower chair back 3 and the support cross rod 5 are kept relatively fixed, so that the cam wrench 20 covers the support cross rod 5, at the moment, the inclined plane of the cam 21 acts on the barrier strip 38 and extrudes the barrier strip 38, the connecting seat 19 and the support cross rod 5 are in clamping fit, and friction force is generated between the connecting seat 19 and the support cross rod 5, so that the sliding block 16 cannot slide along the second sliding groove 17; under the unblock state, rotate cam spanner 20 and make it outwards overturn and open, the inclined plane of cam 21 no longer extrudees and acts on blend stop 38 this moment, makes to be in the state of relaxing between connecting seat 19 and the support horizontal pole 5 then, and slider 16 can slide along second spout 17 promptly to lower back of the chair 3 can support horizontal pole 5 relatively and carry out left right slip regulation. The locking and sliding adjustment of the lower chair back 3 can be effectively controlled by rotating the cam wrench 20, the operation is very convenient, the structure is simple, and the cost can be effectively reduced.

As shown in fig. 13-15, a lifting adjusting device is arranged between the support 1 and the chair columns B, the base a is connected with the two chair columns B, the lifting adjusting device comprises a support 26 sleeved on the two chair columns B by a sliding sleeve, and the support 1 is fixedly connected with the support 26; specifically, the method comprises the following steps: the supporting piece 26 is in a dumbbell shape, and comprises a connecting part 26a arranged transversely and sliding parts 26b positioned at two ends of the connecting part 26a, wherein the sliding parts 26b are in a sleeve structure penetrating through the connecting part 26a up and down; the sliding parts 26B at the two ends of the supporting piece are respectively sleeved on the two chair columns B and are in sliding fit with the chair columns B; and a connecting arm 27 protruding forward is provided at the front end of the sliding portion 26B, and the connecting arm 27 is screwed to the connecting rod 6 of the stand, so that the stand 1 can slide up and down along the seat post B through the support 26.

The connecting part 26a is of an internal hollow structure, and the lifting adjusting device further comprises a pair of transversely arranged inserting columns 28 arranged in the connecting part 26a, inserting slots 29 longitudinally arranged at intervals at the inner sides of the two chair columns B, and a control switch 30 for controlling the transverse movement of the two inserting columns 28; as shown in fig. 14 and 15, the adjacent ends of the two insertion posts 28 are provided with guide blocks 31, and the two guide blocks 31 are connected together through springs 33; a mounting seat 32 is arranged at the middle position of the connecting part 26 a; during installation, the two inserting columns 28 are transversely arranged in the connecting part 26a, the end parts of the two inserting columns 28 are respectively inserted into the slots 28 on the two chair columns B, and the two guide blocks 31 are simultaneously placed in the installation seat 32, so that the guide blocks 31 can only transversely move in the installation seat 32, and at the moment, the springs 33 are in a compressed state and can prevent the inserting columns 28 from being separated from the slots 28; then, the control switch 30 is matched with the guide block 31 from the lower part of the mounting seat 32, specifically: as shown in fig. 15, the control switch 30 includes a guide slot 33 with an upward opening, two symmetrical inclined sides 35 are provided in the guide slot 33, and from top to bottom, the inclined sides 35 are inclined toward the middle of the control switch 30. After the control switch 30 is matched with the guide blocks 31, the two guide blocks 31 are embedded in the guide grooves 33, and the two guide blocks 31 are respectively abutted against the two bevel edges 35; and the length of the guide groove 33 corresponds to the length of the mounting seat 32. The lower end of the connecting part 26a is provided with a lower cover 36 for opening the interior of the connecting part, and finally, after the guide block 31 is matched between the mounting seat 32 and the control switch 30, the lower cover 36 is connected on the connecting part 26a through screws; an avoiding groove 37 for exposing the control switch 30 is formed in the lower cover 36, and after the lower cover 26 is connected, the lower end of the control switch 30 is exposed downwards from the avoiding groove 16, so that the hand can press the control switch conveniently; a stopper 301 is provided at the upper end of the control switch 30, and the stopper 301 can abut against the lower cover 36 to restrict the control switch 30 from being separated from the support 26.

The specific operation mode is as follows: when the height of the bracket 1 needs to be adjusted, the control switch 30 is pressed upwards, so that the control switch 30 moves upwards relative to the bracket 1; the inclined edge 35 acts on the guide blocks 31, so that the two guide blocks 31 move towards the center of the spring 10 respectively, the two guide blocks 31 approach each other, and the spring 33 is compressed; when the control switch 30 moves to a certain distance, the two insertion posts 28 are separated from the insertion slots 29; at the moment, the bracket 1 can slide up and down relative to the chair column B, and then the bracket 11 is moved to adjust the height of the bracket; after the adjustment is finished, the control switch 30 is loosened, the guide block 31 moves under the action of the reset elasticity of the spring 33 and is inserted into the slot 29 again, and the bracket 11 and the chair column B are fixed relatively again; through the adjusting mechanism, the locking and unlocking between the bracket 13 and the chair column B can be effectively and quickly realized, the operation is convenient, and the structure is simple and effective; therefore, the upper chair back 2 and the lower chair back 3 can be simultaneously driven to be upgraded and adjusted together by adjusting the height of the bracket 1.

Then, the chair with the three-back structure of the utility model is provided with the upper chair back 2 and the lower chair back 3 which are separated from each other up and down, so that when a human body uses the chair, the upper chair back 2 supports the back of the human body, the lower chair back 3 supports the waist of the human body, the two lower chair backs 3 independently support the waist, and the lower chair backs 3 protrude forwards from the upper chair back 2, so that the supporting effect of the waist is better, the aching pain of the waist when the chair is used for a long time is prevented, the sitting posture of the human body can be corrected, and the chair is more in line; in addition, the heights of the upper chair back 2 and the lower chair back 3 can be adjusted in a large range at the same time through the adjusting bracket 1; then the upper chair back 2 can independently lift and slide to adjust the height of the chair back component C, so that the chair back component C is suitable for users with different heights; the two lower chair backs 3 can also slide left and right to adjust the width of the chair back component C, so that the chair is suitable for users with different body types, and the use of the chair is more humanized; the sliding and lifting structures on the seat are simple, so that the cost can be saved; and the connecting structure is hidden inside, so that the whole seat is simpler and more attractive.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions for the specific embodiments described herein will be apparent to those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A seat with a three-back structure is characterized in that: comprises a base, a chair column and a chair back component connected with the chair column; the chair back component comprises a bracket, an upper chair back and a lower chair back which are connected to the bracket and are separated from each other up and down; the support is provided with a supporting longitudinal rod and two supporting transverse rods which are oppositely arranged; the upper chair back is connected to the supporting longitudinal rod in a sliding mode, and the upper chair back slides up and down along the supporting longitudinal rod to adjust the height of the upper chair back; the two lower chair backs are separately arranged and are respectively connected to the two supporting cross rods in a sliding manner, and the two lower chair backs slide left and right along the respectively connected supporting cross rods so as to adjust the width of the chair back assembly; a lifting adjusting device is arranged between the bracket and the chair column, the lifting adjusting device comprises a supporting piece which is sleeved on the chair column in a sliding manner, and the rear end of the bracket is fixedly connected with the supporting piece; the bracket slides up and down along the chair column to adjust the height of the upper chair back and the lower chair back simultaneously.

2. A seat of triple back construction according to claim 1, wherein: after the upper chair back and the lower chair back are connected with the bracket, the upper chair back and the lower chair back are both in an inclined state, and the lower chair back is more forwards protruded than the upper chair back.

3. A seat of triple back construction according to claim 1, wherein: the support is of a 'soil' -shaped structure, and the two supporting transverse rods are arranged on the left side and the right side of the lower end of the supporting longitudinal rod; connecting rods extend out of the two sides of the supporting longitudinal rod respectively, and the connecting rods are fixedly connected with the supporting piece; the connecting rod is positioned above the supporting cross rod.

4. A seat of triple back construction according to claim 1, wherein: a lifting mechanism is arranged between the upper chair back and the supporting longitudinal rod, and comprises a sliding supporting block arranged on one of the supporting longitudinal rod or the upper chair back and a first chute arranged on the other of the supporting longitudinal rod or the upper chair back; the upper chair back and the supporting longitudinal rod are in front-back butt joint so that the sliding supporting block is in sliding fit with the first sliding groove.

5. The triple-back structure seat according to claim 4, wherein: the sliding support block is arranged on the support longitudinal rod, and the first sliding groove is correspondingly arranged on the back of the upper chair back; a gear adjusting mechanism is also arranged between the upper chair back and the supporting longitudinal rod, and comprises elastic glass beads arranged on the supporting longitudinal rod and positioning grooves longitudinally distributed on the back of the upper chair back; the upper chair back slides relative to the supporting longitudinal rod, and the elastic glass beads are clamped and matched with the positioning grooves to realize the gear lifting adjustment of the upper chair back.

6. A seat of triple back construction according to claim 1, wherein: the back of the lower chair back is provided with a sliding block, a transverse second sliding groove is correspondingly arranged on the supporting cross rod, and the sliding block is in sliding fit with the second sliding groove; a cam wrench is connected to the sliding block to limit the sliding block to be separated from the second sliding chute; the cam on the cam spanner is hinged with the sliding block; the cam wrench is rotated to realize the sliding locking and unlocking between the lower chair back and the support cross rod.

7. The triple-back structure seat according to claim 6, wherein: in a locking state, the cam wrench is buckled on the supporting cross rod, a cam on the cam wrench is in press fit with the bracket, and the bracket and the chair back are kept relatively fixed; under the unblock state, rotate the cam spanner so that the cam no longer extrudees and acts on the support, the cam spanner outwards overturns and opens, and the back of the chair can be followed and supported horizontal pole horizontal slip.

8. A seat of triple back construction according to claim 3, wherein: the lifting adjusting device also comprises an inserting column, an inserting slot and a control switch, wherein the inserting column, the inserting slot and the control switch are matched in an inserting manner; the inserting columns are arranged in the supporting piece in a bilateral symmetry mode, and the inserting grooves are correspondingly and longitudinally arranged on the chair columns; the control switch can move relative to the support piece, the moving direction of the control switch is perpendicular to the moving direction of the inserting column, and the inserting column is withdrawn from or inserted into the slot in response to the action of the control switch.

9. The triple-back structure seat according to claim 8, wherein: the ends, close to each other, of the two inserting columns are respectively provided with a guide block, and a spring is connected between the two guide blocks; the control switch is provided with a guide groove with an upward opening, and two symmetrical bevel edges are arranged in the guide groove; the lower ends of the two guide blocks are positioned in the guide grooves, and the two guide blocks are respectively abutted against the two oblique edges; the lower end of the control switch is exposed out of the supporting piece, the control switch moves relative to the supporting piece, and the two guide blocks are close to each other and drive the two inserting columns to leave the inserting grooves.

10. The triple-back structure seat according to claim 8, wherein: two bilaterally symmetrical chair columns are arranged on the base; the support piece is in a dumbbell shape and comprises a connecting part which is transversely arranged and sliding parts which are respectively positioned at two ends of the connecting part; the inserted column is transversely arranged in the connecting part; the sliding part is sleeved on the chair column in a sliding mode, and a connecting arm fixedly connected with the connecting rod is arranged at the front end of the sliding part.