CN211608824U

CN211608824U - Folding chair with adjustable backrest

Info

Publication number: CN211608824U
Application number: CN201922238267.5U
Authority: CN
Inventors: 杨宝庆; 李刚; 李昕; 纳文斌; 贾德广; 郑皓仁
Original assignee: Zhejiang Hengfeng Top Leisure Co Ltd
Current assignee: Zhejiang Lexin Outdoor Products Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-10-02
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a folding chair with adjustable backrest, include: the angle adjusting mechanism is hinged to the support body through a plurality of connecting pipes, two ends of the angle adjusting mechanism are connected to the two connecting pipes in the support body respectively, so that the angle adjusting mechanism and the two connecting pipes in the support body form a variable triangle, and the backrest angle of the folding chair can be adjusted by adjusting the triangle. Compared with the prior art, the utility model provides an adjustable folding chair of back can realize the infinitely variable control that the folding chair backed the angle to the in-process of regulation only needs to adjust angle adjustment mechanism, makes the accommodation process operation simplify.

Description

Folding chair with adjustable backrest

Technical Field

The utility model relates to a folding chair technical field, more specifically say, relate to an adjustable folding chair of back.

Background

The folding chairs on the market are divided into two types of adjustable backrest angles and non-adjustable backrest angles, and the adjustment of the backrest angles is realized through an angle adjuster between the backrest and the seat tube or is realized by changing the gear of the armrest relative to the front foot tube.

In the prior art, the scheme of adjusting the angle of the backrest through the angle adjuster is generally complicated to operate and inconvenient to operate when a user sits on a chair; the general gear position is limited through handrail gear adjustment, leads to the back and can only adjust limited several angles, can not satisfy user's demand.

In summary, how to provide a folding chair with an adjustable backrest, which is convenient for adjustment, is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a folding chair with adjustable backrest, which can realize the rapid adjustment of the backrest of the folding chair and make the adjustment process convenient to operate.

In order to achieve the above object, the present invention provides the following technical solutions:

a folding chair with adjustable backrest, comprising: a bracket body, a rear supporting leg, a front supporting leg and an angle adjusting mechanism which are hinged by a plurality of connecting pipes,

the two ends of the angle adjusting mechanism are respectively connected with the two connecting pipes in the bracket body, so that the angle adjusting mechanism and the two connecting pipes in the bracket body form a variable triangle, and the backrest angle of the folding chair can be adjusted by adjusting the triangle.

Preferably, the bracket body comprises a backrest pipe and a seat pipe hinged with the backrest pipe;

one end of the angle adjusting mechanism is connected with the back rest pipe, and the other end of the angle adjusting mechanism is connected with the seat pipe, so that the angle adjusting mechanism, the back rest pipe and the seat pipe form a triangle with adjustable angles.

Preferably, one of the backrest pipe and the seat pipe is hinged with one end of the angle adjusting mechanism, and the other one of the backrest pipe and the seat pipe is connected with the other end of the angle adjusting mechanism in a sliding manner;

and adjusting the position of the angle adjusting mechanism relative to the back rest pipe or the seat pipe so as to enable the back rest pipe to rotate relative to the seat pipe.

Preferably, the angle adjusting mechanism is a telescopic structure, one end of the angle adjusting mechanism is connected to the back rest pipe, the other end of the angle adjusting mechanism is connected to the seat pipe, and the telescopic structure is extended or shortened to enable the back rest pipe to rotate relative to the seat pipe.

Preferably, the support body comprises a back rest pipe, a seat pipe, an armrest pipe and an armrest supporting pipe, wherein one end of the seat pipe is hinged with the back rest pipe, and the other end of the seat pipe is hinged with the armrest supporting pipe; one end of the handrail tube is hinged with the backrest tube, and the other end of the handrail tube is hinged with the handrail supporting tube;

one end of the angle adjusting mechanism is connected with one of the armrest tube, the armrest supporting tube, the backrest tube and the sitting tube, and the other end of the angle adjusting mechanism is connected with the other of the armrest tube, the armrest supporting tube, the backrest tube and the sitting tube, so that a changeable triangle is arranged in a parallelogram formed by the armrest tube, the armrest supporting tube, the backrest tube and the sitting tube, and the backrest tube rotates relative to the sitting tube by adjusting the triangle.

Preferably, one end of the angle adjusting mechanism is slidably connected to the armrest tube, the other end of the angle adjusting mechanism is hinged to the backrest tube or the seat tube, and the position of the angle adjusting mechanism relative to the armrest tube is adjusted, so that the backrest tube rotates relative to the seat tube.

Preferably, the angle adjusting mechanism is a telescopic structure, one end of the angle adjusting mechanism is connected to the armrest tube, the other end of the angle adjusting mechanism is hinged to the backrest tube or the seat tube, and the telescopic structure extends or shortens to enable the backrest tube to rotate relative to the seat tube.

Preferably, the angle adjusting mechanism is slidably and fixedly arranged relative to the handrail tube.

Preferably, the telescopic structure comprises an outer telescopic tube, an inner telescopic tube and a telescopic locking structure for fixing or moving the inner telescopic tube relative to the outer telescopic tube;

one end of the outer telescopic pipe is connected with one connecting pipe in the support body in a sliding mode, the other end of the outer telescopic pipe is sleeved on the periphery of the inner telescopic pipe, and the inner telescopic pipe is hinged to the other connecting pipe in the support body.

Preferably, the handle comprises a handle tube and an outer telescopic tube, wherein the handle tube is provided with a cylindrical connecting part and a sliding connecting part; the outer telescopic pipe is connected in the cylindrical connecting part.

Preferably, the telescopic locking structure is a one-way locking structure to prevent the backrest pipe from rotating backwards relative to the seat pipe.

Preferably, the telescopic locking structure is provided with a trigger for controlling the relative locking or releasing of the inner telescopic pipe and the outer telescopic pipe.

Preferably, a buffer device is arranged in the telescopic locking structure and used for providing resilience when the backrest pipe rotates forwards relative to the seat pipe or providing buffer when the backrest pipe rotates backwards relative to the seat pipe.

Preferably, the damping device is a spring.

Preferably, the number of the handrail tube, the sitting tube, the handrail supporting tube and the telescopic structure is two, and the handrail tube, the sitting tube, the handrail supporting tube and the telescopic structure are symmetrically arranged at the left side and the right side of the backrest tube.

Preferably, the end parts of the rear supporting leg and the front supporting leg are provided with ground feet, and the rear supporting leg and the front supporting leg are rotatably connected with the ground feet.

The utility model provides an adjustable folding chair of back, include: a bracket body, a rear supporting leg, a front supporting leg and an angle adjusting mechanism which are hinged by a plurality of connecting pipes,

In the using process, the rear supporting leg and the front supporting leg are rotated to be in contact with the ground, so that the support body is supported and is in a stable state; the angle or side length of a triangle formed by the angle adjusting mechanism and two connecting pipes in the bracket body is adjusted, so that the backrest angle of the folding chair is changed.

Compared with the prior art, the utility model provides an adjustable folding chair of back can realize the infinitely variable control of back angle to the in-process of regulation only needs control angle adjustment mechanism, makes the accommodation process operation simplify.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is an isometric view of a first embodiment of a folding chair with an adjustable backrest according to the present invention;

FIG. 2 is an isometric view of an alternative viewing angle of the adjustable back rest deckchair of FIG. 1;

FIG. 3 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a first angle;

FIG. 4 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a second angle;

FIG. 5 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a third angle;

FIG. 6 is a side view of the adjustable back rest folding chair of FIG. 1 in a folded position;

FIG. 7 is a side view of a second embodiment of the folding chair with adjustable backrest according to the present invention;

FIG. 8 is a side view of the back tube of the adjustable back rest folding chair of FIG. 9 at another angle;

fig. 9 is a side view of a third embodiment of the folding chair with an adjustable backrest provided by the present invention;

fig. 10 is a side view of a fourth embodiment of the folding chair with adjustable backrest provided by the present invention;

fig. 11 is a side view of a fifth embodiment of the folding chair with adjustable backrest provided by the present invention;

FIG. 12 is a schematic structural view of a telescopic locking structure;

fig. 13 is a schematic structural diagram of a limiting block.

In FIGS. 1-13:

01 is an angle adjusting mechanism, 1 is a back rest pipe, 2 is a handrail pipe, 3 is an outward extension pipe, 4 is a telescopic locking structure, 5 is an inward extension pipe, 6 is a connecting piece, 7 is a seat pipe, 8 is a limiting block, 9 is a handrail supporting pipe, 10 is a rear supporting leg, and 11 is a front supporting leg.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a folding chair with adjustable backrest, which can realize the stepless adjustment of the rotation angle of the backrest and the adjustment process is simple and convenient.

Referring to fig. 1-10, fig. 1 is an isometric view of a first embodiment of a folding chair with an adjustable backrest, according to the present invention; FIG. 2 is an isometric view of an alternative viewing angle of the adjustable back rest deckchair of FIG. 1; FIG. 3 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a first angle; FIG. 4 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a second angle; FIG. 5 is a side view of the back tube of the adjustable back rest deckchair of FIG. 1 at a third angle; FIG. 6 is a side view of the adjustable back rest folding chair of FIG. 1 in a folded position; FIG. 7 is a side view of a second embodiment of the folding chair with adjustable backrest according to the present invention; FIG. 8 is a side view of the back tube of the adjustable back rest folding chair of FIG. 9 at another angle; fig. 9 is a side view of a third embodiment of the folding chair with an adjustable backrest provided by the present invention; fig. 10 is a side view of a fourth embodiment of the folding chair with adjustable backrest provided by the present invention; fig. 11 is a side view of a fifth embodiment of the folding chair with adjustable backrest provided by the present invention; FIG. 12 is a schematic structural view of a telescopic locking structure; fig. 13 is a schematic structural diagram of a limiting block.

This embodiment provides a folding chair with adjustable backrest, includes: the bracket comprises a bracket body, a rear supporting leg 10, a front supporting leg 11 and an angle adjusting mechanism 01 which are hinged by a plurality of connecting pipes;

two ends of the angle adjusting mechanism 01 are respectively connected with the two connecting pipes in the bracket body, so that the angle adjusting mechanism 01 and the two connecting pipes in the bracket body form a variable triangle, and the backrest angle of the folding chair can be adjusted by adjusting the triangle.

In the using process, the rear supporting leg 10 and the front supporting leg 11 are rotated to be in contact with the ground, so that the support body is supported and is in a stable state; the angle or side length of the triangle formed by the angle adjusting mechanism 01 and the two connecting pipes in the bracket body is adjusted, so that the backrest angle of the folding chair is changed.

It should be noted that the bracket body mentioned in this embodiment is a part located at the upper portions of the front support leg 11 and the rear support leg 10, and may only include the back rest tube 1 and the seat tube 7, or may include the back rest tube 1, the seat tube 7, the armrest tube 2, and the armrest support tube 9, or may further include other structures, which is determined specifically according to actual situations and is not described herein.

Compared with the prior art, the utility model provides an adjustable folding chair of back can realize the infinitely variable control of back angle to the in-process of regulation only needs control angle adjustment mechanism 01, makes the accommodation process operation simplify.

On the basis of the above embodiment, in order to make the structure of the folding chair simpler, the bracket body can comprise a backrest tube 1 and a seat tube 7 which is hinged with the backrest tube 1;

one end of the angle adjusting mechanism 01 is connected to the back rest pipe 1, and the other end is connected to the seat pipe 7, so that the angle adjusting mechanism 01, the back rest pipe 1 and the seat pipe 7 form a triangle with adjustable angle.

The triangle with adjustable angle referred to herein means that the angle of each inner corner and the side length of each side of the triangle formed by the back rest pipe 1, the seat pipe 7, and the angle adjusting mechanism 01 can be changed.

On the basis of the above embodiment, one of the backrest tube 1 and the seat tube 7 can be hinged with one end of the angle adjusting mechanism 01, and the other can be connected with the other end of the angle adjusting mechanism 01 in a sliding manner;

the position of the angle adjusting mechanism 01 relative to the back rest pipe 1 or the seat pipe 7 is adjusted to rotate the back rest pipe 1 relative to the seat pipe 7.

Here, the slidable installation of the angle adjustment mechanism 01 in one of the back rest pipe 1 and the seat pipe 7 means that the angle adjustment mechanism 01 is slidably and fixedly installed in one of the back rest pipe 1 and the seat pipe 7.

Preferably, the angle adjusting mechanism 01 may be provided with an associated adjusting component, when in an unlocked state, the angle adjusting mechanism 01 may slide relative to the backrest tube 1 or the seat tube 7, and when in a locked state, the angle adjusting mechanism 01 may be fixedly locked relative to the backrest tube 1 or the seat tube 7.

In addition to the above embodiment, the angle adjusting mechanism 01 may be a telescopic structure, one end of the angle adjusting mechanism 01 is connected to the backrest pipe 1, and the other end is connected to the seat pipe 7, and the telescopic structure is extended or shortened to rotate the backrest pipe 1 relative to the seat pipe 7.

It should be noted that, when the angle adjusting mechanism 01 is a telescopic structure, two ends of the angle adjusting mechanism 01 may be respectively hinged to the backrest pipe 1 and the seat pipe 7, and one end of the angle adjusting mechanism 01 may also be hinged to one of the backrest pipe 1 or the seat pipe 7, and the other end of the angle adjusting mechanism 01 is slidably connected to the other of the backrest pipe 1 or the seat pipe 7, which is determined according to actual conditions and is not described herein.

This embodiment provides a folding chair with adjustable backrest, includes: the chair comprises a backrest pipe 1, a sitting pipe 7, an armrest pipe 2, an armrest supporting pipe 9, a rear supporting leg 10, a front supporting leg 11 and an angle adjusting mechanism 01, wherein one end of the sitting pipe 7 is hinged with the backrest pipe 1, and the other end of the sitting pipe is hinged with the armrest supporting pipe 9; one end of the handrail tube 2 is hinged with the backrest tube 1, and the other end is hinged with the handrail supporting tube 9; one end of the angle adjusting mechanism 01 is connected to one of the handrail tube 2, the handrail supporting tube 9, the back rest tube 1 and the sitting tube 7, and the other end is connected to the other of the handrail tube 2, the handrail supporting tube 9, the back rest tube 1 and the sitting tube 7, so that a variable triangle exists in a parallelogram formed by the handrail tube 2, the handrail supporting tube 9, the back rest tube 1 and the sitting tube 7, and the back rest tube 1 rotates relative to the sitting tube 7 by adjusting the triangle.

It should be noted that the angle adjusting mechanism 01 may be a rod-shaped structure, and in the setting process, two ends of the angle adjusting mechanism 01 may be connected to any two of the armrest tube 2, the armrest supporting tube 9, the back rest tube 1, and the seat tube 7, only a variable triangle may exist in a quadrangle formed by the armrest tube 2, the armrest supporting tube 9, the back rest tube 1, and the seat tube 7. For example: the angle adjusting mechanism 01 may have one end connected to the seat pipe 7 and the other end connected to the handrail pipe 2, or the angle adjusting mechanism 01 may have one end connected to the back rest pipe 1 and the other end connected to the handrail pipe support pipe 9.

In the using process, the rear supporting leg 10 and the front supporting leg 11 are rotated to be in contact with the ground, so as to support the sitting pipe 7 and enable the sitting pipe 7 to be in a stable state; the backrest pipe 1, the armrest pipe 2 and the angle adjusting mechanism 01 are adjusted to enable a variable triangular structure to exist in a parallelogram structure formed by the backrest pipe 1, the armrest pipe 2, the armrest supporting pipe 9 and the sitting pipe 7, when the backrest pipe 1 needs to rotate forwards or backwards relative to the sitting pipe 7, the angle adjusting mechanism 01 needs to be adjusted to enable the backrest pipe 1 to rotate relative to the sitting pipe 7, after the backrest pipe 1 rotates to a proper position, the angle adjusting mechanism 01 enables the triangle to be in a stable state, so that the backrest pipe 1 is fixed to the proper position relative to the sitting pipe 7, and the folding chair is in a stable state.

Compared with the prior art, the utility model provides an adjustable folding chair of back can realize the back pipe 1 for sitting the 7 turned angle's of pipe infinitely variable control to the in-process of regulation only needs control angle adjustment mechanism 01, makes the accommodation process operation simplify.

On the basis of the above embodiment, one end of the angle adjusting mechanism 01 can be slidably connected to the armrest tube 2, the other end is hinged to the backrest tube 1 or the seat tube 7, and the position of the angle adjusting mechanism 01 relative to the armrest tube 2 can be adjusted to rotate the backrest tube 1 relative to the seat tube 7.

The angle adjusting mechanism 01 is connected to the handrail tube 2 in a sliding mode, so that adjustment is convenient, and interference of other parts is avoided.

In the using process, the rear supporting leg 10 and the front supporting leg 11 are rotated to be in contact with the ground, so as to support the sitting pipe 7 and enable the sitting pipe 7 to be in a stable state; the adjustment is backed the pipe 1, the handrail pipe 2, extending structure, make and lean against pipe 1, the handrail pipe 2, angle adjustment mechanism 01 forms changeable triangle-shaped structure, lean against pipe 1, the handrail pipe 2, handrail stay tube 9, sit the parallelogram structure that pipe 7 constitutes, when needs will be backed against pipe 1 and rotate forward or backward for sitting pipe 7, can make angle adjustment mechanism 01 slide for handrail pipe 2, so that lean against pipe 1 and rotate for sitting pipe 7, after backing against pipe 1 and rotating to suitable position, make angle adjustment mechanism 01 fixed for handrail pipe 2, so that it sets up to make to lean against pipe 1 firm.

On the basis of the above embodiment, the angle adjusting mechanism 01 can be a telescopic structure, one end of the angle adjusting mechanism 01 is connected to the armrest tube, the other end is hinged to the backrest tube or the seat tube, and the telescopic structure is extended or shortened to enable the backrest tube to rotate relative to the seat tube.

In the using process, the rear supporting leg 10 and the front supporting leg 11 are rotated to be in contact with the ground, so as to support the sitting pipe 7 and enable the sitting pipe 7 to be in a stable state; the backrest tube 1, the armrest tube 2 and the telescopic structure are adjusted to enable the backrest tube 1, the armrest tube 2 and the angle adjusting mechanism 01 to form a variable triangular structure, and the parallelogram structure formed by the backrest tube 1, the armrest tube 2, the armrest supporting tube 9 and the sitting tube 7 needs to adjust the angle adjusting mechanism 01 to enable the length of the angle adjusting mechanism 01 to be shortened when the backrest needs to rotate backwards relative to the sitting tube 7, at the moment, the backrest tube 1 and the armrest supporting tube 9 in the parallelogram formed by the backrest tube 1, the armrest tube 2, the armrest supporting tube 9 and the sitting tube 7 rotate backwards relative to the sitting tube 7, and after the backrest tube 1, the armrest supporting tube 9 and the sitting tube 7 rotate to a required angle, shortening of the angle adjusting mechanism 01 is stopped, and the folding chair is in a stable state; when the backrest needs to rotate forwards relative to the seat tube 7, the telescopic structure needs to be adjusted, the length of the angle adjusting mechanism 01 is extended, at the moment, the backrest tube 1 and the armrest supporting tube 9 rotate forwards relative to the seat tube 7 in a parallelogram formed by the backrest tube 1, the armrest tube 2, the armrest supporting tube 9 and the seat tube 7, and after the backrest rotates to a required angle, the extension of the angle adjusting mechanism 01 is stopped, so that the folding chair is in a stable state.

In addition to the above-described embodiments, the angle adjusting mechanism 01 may be provided slidably and fixedly with respect to the handle pipe so that the folding chair can be folded.

It should be noted that, in the process of adjusting the rotation angle of the backrest pipe 1 relative to the seat pipe 7, the telescopic structure may move in the direction approaching the backrest pipe 1 relative to the armrest pipe 2, or in the direction approaching the armrest support pipe 9 relative to the armrest pipe 2, which is determined according to the actual situation.

Compared with the prior art, the utility model provides an adjustable folding chair of back can realize the back pipe 1 for sitting the 7 turned angle's of pipe infinitely variable control to the in-process of regulation only needs control extending structure's flexible, makes the accommodation process operation simplify.

Preferably, a connecting piece 6 is arranged at one end of the sitting tube 7 close to the backrest tube 1, and the backrest tube 1 is rotatably connected to the connecting piece 6.

On the basis of the above embodiment, the telescopic structure may include the outer telescopic tube 3, the inner telescopic tube 5, and the telescopic locking structure 4 for fixing or moving the inner telescopic tube 5 with respect to the outer telescopic tube 3; one end of the outer telescopic pipe 3 is connected with one connecting pipe in the support body in a sliding mode, the other end of the outer telescopic pipe is sleeved on the periphery of the inner telescopic pipe 5, and the inner telescopic pipe 5 is hinged to the other connecting pipe in the support body.

The inner telescopic pipe 5 can be hinged to the end part of the back rest pipe 1 or the seat pipe 7, or can be hinged to the non-end part of the back rest pipe 1 or the seat pipe 7, and is determined according to actual conditions.

In the using process, when the telescopic locking structure 4 enables the inner telescopic pipe 5 and the outer telescopic pipe 3 to be in a locking state, the relative positions of the two are fixed, and when the telescopic locking structure 4 enables the inner telescopic pipe 5 and the outer telescopic pipe 3 to be in an unlocking state, the inner telescopic pipe 5 can move relative to the outer telescopic pipe 3.

In order to facilitate installation, the handrail device can further comprise a limiting block 8 connected with the outer telescopic pipe 3, and the limiting block 8 is provided with a cylindrical connecting part used for being connected with the outer telescopic pipe 3 and a sliding connecting part used for being in sliding connection with the handrail pipe 2; the outer telescopic tube 3 is connected inside the cylindrical connection portion.

As shown in fig. 8, the cylindrical connecting portion of the stopper 8 is fitted around the outer peripheral portion of the outer telescopic tube 3, and the sliding connecting portion of the stopper tube is slidably connected to the grab rail 2.

On the basis of the embodiment, in order to avoid controlling the telescopic locking structure 4 to be in the unlocking state all the time in the process that the backrest pipe 1 rotates relative to the seat pipe 7, the telescopic locking structure 4 can be set into a one-way locking structure, only in the process that the backrest pipe 1 rotates backwards relative to the seat pipe 7, the telescopic locking structure 4 needs to be set into the unlocking state, when the backrest pipe 1 rotates forwards relative to the seat pipe 7, no matter the telescopic locking structure 4 is in the locking state or the unlocking state, the backrest pipe 1 can rotate forwards relative to the seat pipe 7, and only friction force between the inner telescopic pipe 5 and the outer telescopic pipe 3 needs to be overcome.

As shown in fig. 7, the telescopic locking structure 4 is provided with a trigger for controlling the relative locking or unlocking of the inner telescopic tube 5 and the outer telescopic tube 3, and in the using process, the trigger is triggered to be in an unlocking state, the telescopic locking structure 4 is triggered to be in a locking state, and the telescopic locking structure 4 is triggered to be in a locking state.

On the basis of the above-described embodiment, in order to avoid that the speed of the backward rotation of the back rest pipe 1 with respect to the seat pipe 7 is too fast during the adjustment, a buffer means for providing a resilient force when the back rest pipe 1 is rotated forward with respect to the seat pipe 7 or providing a buffer when the back rest pipe 1 is rotated backward with respect to the seat pipe 7 may be provided in the telescopic locking structure 4.

Preferably, the damping means is a spring.

In the using process, when a person sits on the chair and backwards adjusts the backrest pipe 1, the backrest pipe 1 needs to overcome the elasticity of the spring, so that the danger caused by the rapid rotation of the backrest pipe 1 is avoided; the spring may provide a pulling force to move when the back tube 1 is adjusted forward, helping to overcome the friction between the inner telescopic tube 5 and the outer telescopic tube 3.

On the basis of the above embodiment, the number of the handrail tube 2, the seat tube 7, the handrail support tube 9 and the telescopic structure can be two, and the handrail tube 2, the seat tube 7, the handrail support tube 9 and the telescopic structure are symmetrically arranged on the left side and the right side of the backrest tube 1.

Preferably, the backrest tube 1 is an inverted U-shaped structure, and both ends of the U-shaped structure are hinged with the seat tube 7.

On the basis of the above-mentioned embodiment, in order to make the utility model provides an adjustable folding chair of back is more firm, can all set up the lower margin at the tip of back supporting leg 10 and preceding supporting leg 11, and back supporting leg 10 and preceding supporting leg 11 all are connected with the lower margin rotation.

Preferably, the rear support leg 10 and the front support leg 11 are both adjustable in length.

Preferably, the backrest pipe 1, the seat pipe 7, the armrest pipe 2, the armrest support pipe 9, the inner telescopic pipe 5, the outer telescopic pipe 3, the rear support leg 10 and the front support leg 11 mentioned in the present document are all hollow circular pipe structures.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

The folding chair with adjustable backrest provided by the utility model is described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A folding chair with adjustable backrest, comprising: a bracket body, a rear supporting leg (10), a front supporting leg (11) and an angle adjusting mechanism (01) which are hinged by a plurality of connecting pipes,

two ends of the angle adjusting mechanism (01) are respectively connected with the two connecting pipes in the bracket body, so that the angle adjusting mechanism (01) and the two connecting pipes in the bracket body form a variable triangle, and the backrest angle of the folding chair can be adjusted by adjusting the triangle.

2. The back-adjustable folding chair according to claim 1, characterized in that the bracket body comprises a back-rest tube (1) and a seat tube (7) hingedly connected to the back-rest tube (1);

one end of the angle adjusting mechanism (01) is connected with the backrest pipe (1), and the other end of the angle adjusting mechanism is connected with the seat pipe (7), so that the angle adjusting mechanism (01), the backrest pipe (1) and the seat pipe (7) form a triangle with adjustable angle.

3. The back-adjustable folding chair according to claim 2, characterized in that one of the back-rest tube (1) and the seat tube (7) is hinged with one end of the angle adjusting mechanism (01) and the other is slidingly connected with the other end of the angle adjusting mechanism (01);

adjusting the position of the angle adjustment mechanism (01) relative to the backrest tube (1) or the seat tube (7) to rotate the backrest tube (1) relative to the seat tube (7).

4. The folding chair with adjustable backrest as claimed in claim 2, characterized in that the angle adjusting mechanism (01) is a telescopic structure, and one end of the angle adjusting mechanism (01) is connected to the backrest tube (1) and the other end is connected to the seat tube (7), and the telescopic structure is extended or shortened to rotate the backrest tube (1) relative to the seat tube (7).

5. The folding chair with the adjustable backrest as claimed in claim 1, wherein the bracket body comprises a backrest tube (1), a sitting tube (7), an armrest tube (2) and an armrest support tube (9), one end of the sitting tube (7) is hinged with the backrest tube (1), and the other end is hinged with the armrest support tube (9); one end of the handrail tube (2) is hinged with the backrest tube (1), and the other end is hinged with the handrail supporting tube (9);

the one end of angle adjustment mechanism (01) connect in handrail pipe (2) handrail stay tube (9) lean back pipe (1) with sit one in pipe (7), the other end connect in handrail pipe (2) handrail stay tube (9) lean back pipe (1) with sit another in pipe (7), so that handrail pipe (2) handrail stay tube (9) lean back pipe (1) with there is changeable triangle-shaped in the parallelogram that pipe (7) are constituteed, through adjusting triangle-shaped makes lean back pipe (1) for sit pipe (7) and rotate.

6. The folding chair with adjustable backrest as claimed in claim 5, characterized in that one end of the angle adjusting mechanism (01) is slidably connected to the armrest tube (2) and the other end is hingedly connected to the backrest tube (1) or the seat tube (7), and the position of the angle adjusting mechanism (01) relative to the armrest tube (2) is adjusted to rotate the backrest tube (1) relative to the seat tube (7).

7. The folding chair with adjustable backrest as claimed in claim 5, wherein the angle adjusting mechanism (01) is a telescopic structure, one end of the angle adjusting mechanism (01) is connected to the armrest tube (2), and the other end is connected to the backrest tube (1) or the seat tube (7), and the telescopic structure is extended or shortened to enable the backrest tube (1) to rotate relative to the seat tube (7).

8. The back-adjustable folding chair according to claim 7, characterized in that the angle adjustment mechanism (01) is slidably and fixedly arranged relative to the armrest tube (2).

9. The back adjustable folding chair according to any one of claims 7 or 8, wherein the telescopic structure comprises an outer telescopic tube (3), an inner telescopic tube (5) and a telescopic locking structure (4) for fixing or moving the inner telescopic tube (5) relative to the outer telescopic tube (3);

one end of the outer telescopic pipe (3) is connected with one connecting pipe in the support body in a sliding mode, the other end of the outer telescopic pipe is sleeved on the periphery of the inner telescopic pipe (5), and the inner telescopic pipe (5) is hinged to the other connecting pipe in the support body.

10. The folding chair with the adjustable backrest as claimed in claim 9, further comprising a limiting block (8) connected with the outer telescopic tube (3), wherein the limiting block (8) is provided with a cylindrical connecting part for connecting with the outer telescopic tube (3) and a sliding connecting part for sliding connecting with the armrest tube (2); the outer telescopic pipe (3) is connected in the cylindrical connecting part.

11. The back-adjustable folding chair according to claim 9, characterized in that the telescopic locking structure (4) is a one-way locking structure to prevent the back-rest tube (1) from rotating backwards relative to the seat tube (7).

12. The folding chair with adjustable backrest as claimed in claim 11, wherein the telescopic locking structure (4) is provided with a trigger for controlling the relative locking or unlocking of the inner telescopic tube (5) and the outer telescopic tube (3).

13. The back-adjustable folding chair according to claim 9, characterized in that a damping device is provided in the telescopic locking structure (4) for providing a resilient force when the back tube (1) is rotated forward relative to the seat tube (7) or a damping when the back tube (1) is rotated backward relative to the seat tube (7).

14. The back adjustable folding chair of claim 13 wherein the cushioning device is a spring.

15. The folding chair with adjustable backrest according to claim 9, wherein the number of the armrest tube (2), the sitting tube (7), the armrest support tube (9) and the telescopic structure is two, and the armrest tube (2), the sitting tube (7), the armrest support tube (9) and the telescopic structure are symmetrically arranged on the left side and the right side of the backrest tube (1).

16. The folding chair with adjustable backrest according to any of claims 1-3 or 5-6, characterized in that the ends of the rear support leg (10) and the front support leg (11) are each provided with a foot, to which the rear support leg (10) and the front support leg (11) are each rotatably connected.