CN219645366U

CN219645366U - Ergonomic chair capable of automatically adjusting backrest

Info

Publication number: CN219645366U
Application number: CN202320439813.5U
Authority: CN
Inventors: 肖明; 姚依然
Original assignee: Yibai Zhengzhou Medical Technology Co ltd
Current assignee: Yibai Zhengzhou Medical Technology Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-09-08
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses an ergonomic chair capable of automatically adjusting a backrest, which comprises a lifting base, an adjusting mechanism, a cushion support piece and a backrest support piece; the adjusting mechanism comprises a first swing arm, a second swing arm, a third swing arm and a first telescopic cylinder; the first swing arm, the second swing arm, the third swing arm and the cushion support piece are sequentially hinged to form a hinged four-bar mechanism, wherein the first swing arm and the second swing arm are both positioned below the cushion support piece, the upper end of the third swing arm extends upwards, and the extension part is connected with the backrest support piece; the first swing arm fixed connection is in the upper end of lifting base, the upper end and the lower extreme of first flexible jar articulate respectively between cushion support piece and first swing arm, through pushing down cushion support piece, and then make articulated four-bar linkage and the corresponding forward slope of first flexible jar and back support piece. The utility model increases the self-adaptive adjusting function of the backrest and the flexibility of the armrests, and improves the protection of lumbar vertebra parts of human bodies.

Description

Ergonomic chair capable of automatically adjusting backrest

Technical Field

The utility model relates to the field of seats, in particular to an ergonomic chair capable of automatically adjusting a backrest.

Background

The backrest of the ergonomic chair in the market at present adopts manual adjustment, and every time the weight changes, the inclination of the backrest needs to be manually readjusted, namely the inclination of the backrest can not be adaptively adjusted according to the weight. Therefore, the existing ergonomic chairs are inconvenient to use for people who often need to replace sitting postures or different weights, for example, doctors need to adjust the height of the chairs, the inclination angle of the backrest, the height and the angle of armrests and other complicated operations before performing operation, on one hand, time is wasted, on the other hand, the backrest of the chairs cannot change the inclination angle to support the waist and the back of the doctors after the sitting postures of the doctors are changed, if the chairs are not readjusted, the discomfort of the waist is obviously aggravated after long-time use, and lumbar injuries are caused by daily accumulation and month accumulation. In addition, the handrail of the existing ergonomic chair has limited flexibility, so that the use of users is limited to a certain extent, and the use is more inconvenient.

Disclosure of Invention

Aiming at the defects in the prior art, the self-adaptive adjusting function of the backrest and the flexibility of the armrests are increased, and the protection of lumbar vertebra parts of human bodies is improved. The utility model provides an ergonomic chair capable of automatically adjusting a backrest, which comprises a lifting base, an adjusting mechanism, a cushion support piece and a backrest support piece; the adjusting mechanism comprises a first swing arm, a second swing arm, a third swing arm and a first telescopic cylinder; the first swing arm, the second swing arm, the third swing arm and the cushion support piece are sequentially hinged to form a hinged four-bar mechanism, wherein the first swing arm and the second swing arm are both positioned below the cushion support piece, the upper end of the third swing arm extends upwards, and the extension part is connected with the backrest support piece;

the first swing arm fixed connection is in the upper end of lifting base, the upper end and the lower extreme of first flexible jar articulate respectively between cushion support piece and first swing arm, through pushing down cushion support piece, and then make articulated four-bar linkage and the corresponding forward slope of first flexible jar and back support piece.

The utility model has the beneficial effects that: the inclination angle of the backrest support piece is adaptively adjusted through the weight of the human body sitting on the cushion support piece, so that the backrest support piece always supports the waist of the human body. The sitting posture-keeping device is particularly suitable for doctors keeping sitting postures for a long time, even if the doctors change the pressure on the cushion support piece according to the sitting postures at will, the back support piece can also support the waist of the doctors, so that the compression on thigh blood vessels of the doctors caused by sitting on the seat for a long time is reduced, the protection on the waist, thigh and other parts of the human body is improved, meanwhile, the trouble of manual adjustment is omitted, a large amount of precious time is saved, and the use is more convenient.

Preferably, two first telescopic cylinders are arranged, and the two first telescopic cylinders are hinged between the cushion support piece and the first swing arm in parallel. The lower ends of the two first telescopic cylinders are connected with a sliding block positioned at the inner side of the first swing arm, and the sliding block is provided with a rotatable first screw knob; the first swing arm is provided with a strip-shaped chute extending along the vertical direction, and the screw rod of the first screw rod knob penetrates out of the strip-shaped chute, so that the knob of the first screw rod knob is positioned at the outer side of the first swing arm. A knob for rotating the first screw knob,

the screw rod of the first screw rod knob is extended, and the sliding block is upwards slid along the strip-shaped sliding groove to reduce the reaction force of the adjusting structure, namely the supporting force of the backrest supporting piece; the downward sliding slide block increases the reaction force of the adjusting structure, namely the supporting force of the backrest supporting piece. The user can adjust the supporting force according to self needs, and the adaptability of back support piece is stronger.

Preferably, a limiting piece for limiting the lowest point of the cushion support piece is arranged on the inner side of the first swing arm; the limiting piece comprises a vertical supporting plate and an inclined supporting plate, the lower end of the vertical supporting plate is fixedly connected with the first swing arm, the lower face of the inclined supporting plate is fixedly connected with the upper end of the vertical supporting plate, and the upper face of the inclined supporting plate is provided with a contact area increasing abutting piece. After the compression amount of the first telescopic cylinder reaches the maximum value, the abutting piece abuts against the lower surface of the cushion supporting piece, pressure is transmitted to the lifting base through the inclined supporting plate, the vertical supporting plate and the first swing arm, and the first telescopic cylinder is protected.

Preferably, the lifting base comprises a universal roller bracket and a second telescopic cylinder, the lower end of the second telescopic cylinder is fixedly connected with the universal roller bracket, the upper end of the second telescopic cylinder is fixedly connected with the first swing arm, and a switch bolt at the upper end of the second telescopic cylinder penetrates through the first swing arm to stretch into the inner side of the first swing arm. The middle part of the vertical supporting plate is hinged with a lever; one end of the lever is positioned above the switch bolt, and the other end of the lever extends out of the first swing arm and a handle is arranged at the extending end. The handle is lifted upwards, the switch bolt is pressed down through the lever, unlocking of the second telescopic cylinder is achieved, the telescopic quantity of the second telescopic cylinder is convenient to adjust, and the second telescopic cylinder is identical to a telescopic cylinder of an existing seat.

Preferably, the cushion support and the backrest support are each provided with a cushion pad.

Preferably, the telescopic shaft of the second telescopic cylinder is provided with a left armrest support and a right armrest support which are symmetrically distributed on two sides of the cushion support; the left handrail support and the right handrail support have the same structure and comprise a horizontal telescopic assembly, a vertical telescopic assembly, a handrail telescopic assembly and an arm support; the telescopic cylinder of the horizontal telescopic component is fixedly connected with the telescopic shaft of the second telescopic cylinder, the telescopic rod of the horizontal telescopic component is fixedly connected with the telescopic cylinder of the vertical telescopic component, the telescopic rod of the vertical telescopic component is fixedly connected with the telescopic rod of the armrest telescopic component, and the arm support is rotatably connected to the upper surface of the telescopic cylinder of the armrest telescopic component; the telescopic cylinder of the armrest telescopic assembly is in sliding connection with the telescopic rod through the sliding rail assembly; the telescopic cylinder of the horizontal telescopic component, the telescopic cylinder of the vertical telescopic component and the telescopic cylinder of the handrail telescopic component are respectively provided with a positioning bolt for controlling the corresponding telescopic rod. The horizontal telescopic component adopts a square pipe, and after the positioning bolt of the horizontal telescopic component is screwed up, the telescopic rod of the horizontal telescopic component cannot be telescopic. The vertical telescopic component and the armrest telescopic component are round pipes, and after the positioning bolts of the vertical telescopic component are screwed up, the telescopic rod of the vertical telescopic component cannot rotate and cannot stretch. If the telescopic rod of the vertical telescopic assembly is required to be rotatable but not lifted, a sleeve bolt needs to be added on the telescopic rod of the vertical telescopic assembly, the sleeve bolt is screwed down, and the positioning bolt of the vertical telescopic assembly is loosened, so that the telescopic rod of the vertical telescopic assembly cannot be lowered but can be rotated. After the positioning bolt of the armrest telescopic assembly is locked, the telescopic cylinder of the armrest telescopic assembly cannot be telescopic, the arm support is kept upwards all the time, but the arm support can rotate in any direction in a horizontal plane through the pin shaft, and the vertical telescopic assembly can rotate in the horizontal plane in a combined mode, so that the left armrest support and the right armrest support are very convenient to adjust.

Preferably, the backrest support is connected with the extension part through a sliding plate and a telescopic plate, and the sliding plate is connected with the telescopic plate in a sliding way; the expansion plate is hinged with the extension part, and is provided with a rotatable second screw knob, and the screw rod of the second screw knob is abutted against the lower surface of the extension part, so that the included angle between the sliding plate and the extension part is adjusted. The telescopic plate is provided with a rotatable third screw knob, the sliding plate is provided with a bar-shaped limiting hole extending along the long side direction of the sliding plate, a screw rod of the third screw knob penetrates through the bar-shaped limiting hole, the sliding plate is clamped through the knob of the third screw knob, and then the sliding plate is fixed with the telescopic plate. The second screw knob and the third screw knob are used for adjusting the inclination angle and the height of the backrest support respectively.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a cross-sectional view of A-A of FIG. 1;

FIG. 3 is a perspective view of FIG. 1;

fig. 4 is a schematic structural view of the armrest telescopic assembly in the present embodiment.

In the drawings, a cushion support 1, a backrest support 2, a first swing arm 3, a second swing arm 4, a third swing arm 5, a first telescopic cylinder 6, an extension 7, a universal roller bracket 8, a second telescopic cylinder 9, a switch bolt 10, a left armrest bracket 11, a right armrest bracket 12, a horizontal telescopic assembly 13, a vertical telescopic assembly 14, an armrest telescopic assembly 15, an arm rest 16, a slide rail assembly 17, a telescopic cylinder 18, a telescopic rod 19, a positioning bolt 20, a sleeve bolt 21, a slide block 22, a first screw knob 23, a bar-shaped slide groove 24, a vertical support plate 25, a tilting support plate 26, a tightening piece 27, a slide plate 28, a telescopic plate 29, a second screw knob 30, a third screw knob 31, a bar-shaped limiting hole 32, a lever 33, a handle 34, a cushion 35 and a pin 36.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs.

As shown in fig. 1 and 2, the present embodiment provides an ergonomic chair with an automatically adjustable backrest, which comprises a lifting base, an adjusting mechanism, a cushion support 1 and a backrest support 2. The adjusting mechanism comprises a first swing arm 3, a second swing arm 4, a third swing arm 5 and a first telescopic cylinder 6; the first swing arm 3, the second swing arm 4, the third swing arm 5 and the cushion support 1 are hinged in sequence and form a hinged four-bar mechanism, wherein the first swing arm 3 and the second swing arm 4 are both positioned below the cushion support 1, and the upper end of the third swing arm 5 extends upwards and the extension part 7 is connected with the backrest support 2. The first swing arm 3 is fixedly connected to the upper end of the lifting base, and the specific structure of the lifting base is as follows:

as shown in fig. 1, 3 and 4, the lifting base comprises a universal roller bracket 8 and a second telescopic cylinder 9, the lower end of the second telescopic cylinder 9 is fixedly connected with the universal roller bracket 8, the upper end of the second telescopic cylinder 9 is fixedly connected with the first swing arm 3, and a switch bolt 10 at the upper end of the second telescopic cylinder 9 penetrates through the first swing arm 3 and stretches into the inner side of the first swing arm 3. Further, the telescopic shaft of the second telescopic cylinder 9 is provided with a left armrest bracket 11 and a right armrest bracket 12 which are symmetrically distributed on two sides of the cushion support piece 1; the left handrail support 11 and the right handrail support 12 have the same structure and comprise a horizontal telescopic assembly 13, a vertical telescopic assembly 14, a handrail telescopic assembly 15 and an arm support 16; the telescopic cylinder 18 of the horizontal telescopic assembly 13 is fixedly connected with the telescopic shaft of the second telescopic cylinder 9, the telescopic rod 19 of the horizontal telescopic assembly 13 is fixedly connected with the telescopic cylinder 18 of the vertical telescopic assembly 14, the telescopic rod 19 of the vertical telescopic assembly 14 is fixedly connected with the telescopic rod 19 of the armrest telescopic assembly 15, and the arm support 16 is rotatably connected to the upper surface of the telescopic cylinder 18 of the armrest telescopic assembly 15. Wherein the telescopic rod 19 of the vertical telescopic assembly 14 is fixedly connected with the telescopic rod 19 of the armrest telescopic assembly 15, thereby forming a T-shaped rod. The telescopic cylinder 18 of the armrest telescopic assembly 15 is in sliding connection with the telescopic rod 19 through the sliding rail assembly 17; the telescopic cylinder 18 of the horizontal telescopic assembly 13, the telescopic cylinder 18 of the vertical telescopic assembly 14 and the telescopic cylinder 18 of the armrest telescopic assembly 15 are respectively provided with a positioning bolt 20 for controlling a corresponding telescopic rod 19. The horizontal telescopic assembly 13 adopts a square pipe, and after the positioning bolts 20 of the horizontal telescopic assembly 13 are screwed, the telescopic rods 19 cannot be telescopic. The vertical telescopic assembly 14 and the armrest telescopic assembly 15 are all round pipes, wherein after the positioning bolts 20 of the vertical telescopic assembly 14 are screwed down, the telescopic rods 19 cannot rotate and cannot be telescopic. If the telescopic rod 19 of the vertical telescopic assembly 14 is to be rotatable but not to be lifted, a sleeve bolt 21 needs to be added to the telescopic rod 19 of the vertical telescopic assembly 14, the sleeve bolt 21 is screwed down, and the positioning bolt 20 of the vertical telescopic assembly 14 is loosened, the telescopic rod 19 of the vertical telescopic assembly 14 cannot be lowered but can be rotated. After the positioning bolt 20 of the armrest telescopic assembly 15 is locked, the telescopic cylinder 18 of the armrest telescopic assembly 15 stretches and keeps the arm support 16 upwards all the time, but the arm support 16 can rotate in any direction in a horizontal plane through the pin shaft 36, and the vertical telescopic assembly 14 can rotate in the horizontal plane, so that the left armrest support 11 and the right armrest support 12 are convenient to adjust.

As shown in fig. 2 and 3, the upper end and the lower end of the first telescopic cylinder 6 are respectively hinged between the cushion support 1 and the first swing arm 3, and by pressing down the cushion support 1, the hinged four-bar mechanism is linked with the first telescopic cylinder 6 and the backrest support 2 is correspondingly inclined forwards. Specifically, two first telescopic cylinders 6 are provided, and the two first telescopic cylinders 6 are hinged in parallel between the cushion support 1 and the first swing arm 3. The lower ends of the two first telescopic cylinders 6 are connected with a sliding block 22 positioned at the inner side of the first swing arm 3, and the sliding block 22 is provided with a rotatable first screw knob 23; the first swing arm 3 is provided with a bar-shaped chute 24 extending along the vertical direction, and the screw of the first screw knob 23 penetrates out of the bar-shaped chute 24, so that the knob of the first screw knob 23 is positioned outside the first swing arm 3. Rotating the knob of the first screw knob 23 to extend the screw of the first screw knob 23, and sliding the slider 22 upwards along the bar-shaped chute 24 to reduce the reaction force of the adjusting structure, namely the supporting force of the backrest support 2; the downward sliding of the slider 22 increases the reaction force of the adjustment structure, i.e. increases the supporting force of the back support 2. The user can adjust the supporting force according to own needs, and the adaptability of the backrest support 2 is stronger. In addition, a limiting piece for limiting the lowest point of the cushion support piece 1 is arranged on the inner side of the first swing arm 3; the limiting piece comprises a vertical supporting plate 25 and an inclined supporting plate 26, the lower end of the vertical supporting plate 25 is fixedly connected with the first swing arm 3, the lower surface of the inclined supporting plate 26 is fixedly connected with the upper end of the vertical supporting plate 25, and a contact area increasing abutting piece 27 is arranged on the upper surface of the inclined supporting plate 26. When the compression amount of the first telescopic cylinder 6 reaches the maximum value, the abutting piece 27 abuts against the lower surface of the cushion support piece 1, and pressure is transmitted to the lifting base through the inclined support plate 26, the vertical support plate 25 and the first swing arm 3, so that the first telescopic cylinder 6 is protected. Further, the backrest support 2 is connected with the extension part 7 through a sliding plate 28 and a telescopic plate 29, and the sliding plate 28 is in sliding connection with the telescopic plate 29; the expansion plate 29 is hinged with the extension part 7, and the expansion plate 29 is provided with a rotatable second screw knob 30, and the screw rod of the second screw knob 30 is abutted against the lower surface of the extension part 7, so that the included angle between the sliding plate 28 and the extension part 7 is adjusted. The telescopic plate 29 is provided with a rotatable third screw knob 31, the sliding plate 28 is provided with a bar-shaped limiting hole 32 extending along the long side direction of the sliding plate 28, the screw rod of the third screw knob 31 penetrates through the bar-shaped limiting hole 32, the sliding plate 28 is clamped through the knob of the third screw knob 31, and then the sliding plate 28 is fixed with the telescopic plate 29. The second screw knob 30 and the third screw knob 31 are used to adjust the inclination angle and the height of the back support 2, respectively. In addition, the middle part of the vertical support plate 25 is hinged with a lever 33; one end of the lever 33 is located above the switch bolt 10, and the other end of the lever 33 extends out of the first swing arm 3 and the extending end is provided with a handle 34. Lifting the handle 34 upwards, pressing the switch bolt 10 through the lever 33 to unlock the second telescopic cylinder 9, and conveniently adjusting the telescopic quantity of the second telescopic cylinder 9, which is the same as that of the telescopic cylinder of the existing seat.

In this embodiment, cushion support 1 and back support 2 all are equipped with blotter 35, after the human body sits on blotter 35 of cushion support 1, use first swing arm 3 as the strong point, whole first swing arm 3 is motionless, and the contained angle between first swing arm 3 and the second swing arm 4 grow, contained angle between second swing arm 4 and the third swing arm 5 diminishes, thereby make cushion support 1 backward lower direction slope, simultaneously third swing arm 5 drives back support 2 and moves forward in order to laminate at human back, whole adjustment mechanism has realized the inclination of back support 2 is adjusted to human weight self-adaptation. In addition, the two first telescopic cylinders 6 are synchronously compressed along with the descending of the cushion support piece 1, so that the cushion support piece has the functions of supporting and buffering, and the elastic force is provided for the adjusting mechanism to restore the initial position, and meanwhile, the elastic force of the first telescopic cylinders 6 is also the key point of adaptive weight.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.

Claims

1. An ergonomic chair with automatically adjustable backrest, characterized in that: comprises a lifting base, an adjusting mechanism, a cushion support piece and a backrest support piece; the adjusting mechanism comprises a first swing arm, a second swing arm, a third swing arm and a first telescopic cylinder; the first swing arm, the second swing arm, the third swing arm and the cushion support piece are sequentially hinged to form a hinged four-bar mechanism, wherein the first swing arm and the second swing arm are both positioned below the cushion support piece, the upper end of the third swing arm extends upwards, and the extension part is connected with the backrest support piece;

2. An ergonomic chair with automatically adjustable backrest as in claim 1 wherein: the two first telescopic cylinders are hinged between the cushion support piece and the first swing arm in parallel.

3. An ergonomic chair with automatically adjustable backrest as in claim 2 wherein: the lower ends of the two first telescopic cylinders are connected with a sliding block positioned at the inner side of the first swing arm, and the sliding block is provided with a rotatable first screw knob; the first swing arm is provided with a strip-shaped chute extending along the vertical direction, and the screw rod of the first screw rod knob penetrates out of the strip-shaped chute, so that the knob of the first screw rod knob is positioned at the outer side of the first swing arm.

4. An ergonomic chair with automatically adjustable backrest as in claim 1 wherein: a limiting piece for limiting the lowest point of the cushion support piece is arranged on the inner side of the first swing arm; the limiting piece comprises a vertical supporting plate and an inclined supporting plate, the lower end of the vertical supporting plate is fixedly connected with the first swing arm, the lower face of the inclined supporting plate is fixedly connected with the upper end of the vertical supporting plate, and the upper face of the inclined supporting plate is provided with a contact area increasing abutting piece.

5. An ergonomic chair with automatically adjustable backrest as in claim 4 wherein: the lifting base comprises a universal roller bracket and a second telescopic cylinder, the lower end of the second telescopic cylinder is fixedly connected with the universal roller bracket, the upper end of the second telescopic cylinder is fixedly connected with the first swing arm, and a switch bolt at the upper end of the second telescopic cylinder penetrates through the first swing arm to stretch into the inner side of the first swing arm.

6. An ergonomic chair with automatically adjustable backrest as in claim 5 wherein: the middle part of the vertical supporting plate is hinged with a lever; one end of the lever is positioned above the switch bolt, and the other end of the lever extends out of the first swing arm and a handle is arranged at the extending end.

7. An ergonomic chair with automatically adjustable backrest as in claim 1 wherein: cushion support and back support all are equipped with the blotter.

8. An ergonomic chair with automatically adjustable backrest as in claim 5 wherein: the telescopic shaft of the second telescopic cylinder is provided with a left armrest support and a right armrest support which are symmetrically distributed on two sides of the cushion support piece; the left handrail support and the right handrail support have the same structure and comprise a horizontal telescopic assembly, a vertical telescopic assembly, a handrail telescopic assembly and an arm support;

the telescopic cylinder of the horizontal telescopic component is fixedly connected with the telescopic shaft of the second telescopic cylinder, the telescopic rod of the horizontal telescopic component is fixedly connected with the telescopic cylinder of the vertical telescopic component, the telescopic rod of the vertical telescopic component is fixedly connected with the telescopic rod of the armrest telescopic component, and the arm support is rotatably connected to the upper surface of the telescopic cylinder of the armrest telescopic component; the telescopic cylinder of the armrest telescopic assembly is in sliding connection with the telescopic rod through the sliding rail assembly;

the telescopic cylinder of the horizontal telescopic component, the telescopic cylinder of the vertical telescopic component and the telescopic cylinder of the handrail telescopic component are respectively provided with a positioning bolt for controlling the corresponding telescopic rod.

9. An ergonomic chair with automatically adjustable backrest as in claim 1 wherein: the backrest support piece is connected with the extension part through a sliding plate and a telescopic plate, and the sliding plate is connected with the telescopic plate in a sliding way; the expansion plate is hinged with the extension part, and is provided with a rotatable second screw knob, and the screw rod of the second screw knob is abutted against the lower surface of the extension part, so that the included angle between the sliding plate and the extension part is adjusted.

10. An ergonomic chair with automatically adjustable backrest as in claim 9 wherein: the telescopic plate is provided with a rotatable third screw knob, the sliding plate is provided with a bar-shaped limiting hole extending along the long side direction of the sliding plate, a screw rod of the third screw knob penetrates through the bar-shaped limiting hole, the sliding plate is clamped through the knob of the third screw knob, and then the sliding plate is fixed with the telescopic plate.