Device and chassis for adjusting leaning and pitching angle and force of chair back

Abstract

According to the device and the chassis for adjusting the leaning angle and the leaning force of the chair back, the telescopic assembly of the device acts on the chair back and is shortened along with backward leaning of the chair back, the multiple springs are arranged on the multiple working positions of the telescopic assembly, the springs of different numbers act on leaning of the chair back through the first adjusting piece, and the leaning angle and the leaning force of the chair back are adjusted. The leaning and leaning force adjustment of the chair back is realized, so that people with different weights can feel more comfortable and reasonable force feedback of leaning and leaning of the chair back; the second adjusting piece is used for adjusting the telescopic stroke of the telescopic assembly, so that the inclination angle of the chair back is adjusted, and the inclination of the chair back can adapt to different application scenes; according to the chassis, linkage of the seat and the back is achieved, the chair seat can slide along with leaning of the chair back, the telescopic assembly is located in the bottom shell and the seat connecting piece, the seat connecting piece moves along with movement of the chair seat, so that the telescopic assembly is driven to stretch out and draw back, more diversified changes are brought to leaning and leaning movement of the chair back, and therefore the chassis adapts to and meets various requirements of various crowds; the adaptability and the use feeling of the seat are improved.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a device and a chassis for adjusting the tilt angle and strength of a chair back. Background Art

[0002] As people's living standards improve, users have higher and higher requirements for furniture. As one of the most common furniture, the comfort and functionality of seats are particularly valued. Designers and engineers are constantly making improvements to enhance the market competitiveness of seats. However, seemingly simple seats have many aspects worthy of in-depth research, and often need to consider factors such as cost, appearance, ergonomics, and mechanical movement. There is a lot to be said about just the movement of the chair back tilting back.

[0003] In existing office chairs and leisure chairs, it is a common technology to tilt the back of the chair to allow the user to lie back on the chair. With the development of the market, people have not only become accustomed to it, but have also begun to be dissatisfied with the user experience. Nowadays, simple tilting can no longer meet people's requirements, because the simple backrest tilting technology is difficult to adapt to different groups of people, and cannot meet the different needs of different groups of people. First, when the backrest is tilted, users of different weights feel the same feedback, while people with light weight will feel that the feedback of the backrest tilt is too large, that is, the reaction force is too large, and it is difficult to lie down completely, while people with heavy weight will feel that the feedback of the backrest tilt is small, and they will fall down directly without control if they lean back a little, let alone keep themselves at a certain tilted but not completely lying angle, which lacks many usage scenarios, such as playing with mobile phones while half lying down.

[0004] Therefore, there is an urgent need for a device to provide more diverse changes in the chair back tilting movement to adapt to and meet the various needs of various groups of people and improve adaptability and user experience. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a device for adjusting the reclining angle and force of a chair back, wherein a telescopic component acts on the chair back and shortens as the chair back tilts backward. The telescopic component is provided with multiple springs on its multiple working positions, and the first spring in the first working position always acts when the telescopic component is extended and retracted, so as to serve as the most basic force feedback spring for the reclining of the chair back, and the second spring in the second working position switches between a working state and a dormant state under the action of the first adjusting member to adjust different force feedbacks for the reclining of the chair back, thereby realizing the force adjustment of the reclining of the chair back, so that people of different weights can feel a more comfortable and reasonable force feedback for the reclining of the chair back; the second adjusting member on the telescopic component can switch the blocking part and the abutting part of different depths to align when sliding, and the abutting part can prevent the telescopic component from further shortening when abutting against the blocking part, thereby realizing the adjustment of the telescopic stroke of the telescopic component, and then realizing the adjustment of the reclining angle of the chair back, so that the reclining of the chair back can adapt to different application scenarios; thereby adapting to and meeting the various needs of various people, and improving the adaptability and use experience of the seat.

[0006] Furthermore, a chassis is provided to realize the linkage of the seat back, and the seat can slide as the seat back tilts. The telescopic component is located between the bottom shell and the seat connecting part. The seat connecting part moves with the movement of the seat, thereby driving the telescopic component to extend and retract, so that the above-mentioned device can act on the tilt adjustment of the seat back, bringing more diverse changes to the tilt movement of the seat back, thereby adapting to and meeting the various needs of various people and improving the adaptability and usage experience of the seat.

[0007] The technical solution of the present invention is achieved in this way: A device and chassis for adjusting the tilt angle and strength of a chair back, comprising a telescopic component, the telescopic component acting on the chair back, the telescopic component shortening when the chair back tilts backward; The telescopic assembly has a first working position and at least one second working position, the first working position and the second working position are arranged side by side and extend along the telescopic direction of the telescopic assembly; A first spring is provided in the first working position, and a second spring is provided in the second working position, wherein the first spring is configured so that when the telescopic assembly is shortened, the first spring is always compressed; The length occupied by the second spring in the second working position is smaller than the length of the second working position, and the unoccupied part of the second working position is the margin space; a first adjusting member is provided on the telescopic assembly, the first adjusting member is slidably arranged on the telescopic assembly and the first adjusting member is located near the margin space end of the second spring, and the first adjusting member selectively enters or leaves the margin space when sliding; when the first adjusting member enters the margin space, the second spring is in a working state, and when the telescopic assembly is shortened, the second spring is compressed together with the first spring; when the first adjusting member leaves the margin space, the second spring is in a dormant state, and when the telescopic assembly is shortened, only the first spring is compressed; The telescopic assembly is also provided with a second adjusting member, which is slidably arranged on the telescopic assembly in a direction perpendicular to the telescopic direction of the telescopic assembly; a plurality of blocking parts are provided on the second adjusting member, which are arranged along the sliding direction of the second adjusting member; in the telescopic direction of the telescopic assembly, different blocking parts are located at different depths; the telescopic assembly includes an abutting part, and when the telescopic assembly is shortened, the abutting part moves toward the second adjusting member; when the second adjusting member slides, different blocking parts are aligned with the abutting part, and when the abutting part abuts against the blocking part, the telescopic assembly is prevented from further shortening.

[0008] The telescopic component acts on the chair back. When the chair back tilts backward, the telescopic component shortens. When the chair back is restored to an upright position and rotates forward, the telescopic component lengthens. Therefore, the telescopic component can adjust the tilt of the chair back. First, the telescopic component has multiple working positions, each of which is provided with a spring. The first working position is provided with a first spring. The first spring is always compressed as the telescopic component shortens. Therefore, it always acts on the tilting movement of the chair back to give feedback to the user. The springs provided in other working positions do not always act on the chair back. Only when the first adjustment member enters the working position to close the margin space, the springs in the working position The spring can be compressed as the chair back tilts, while also giving the user more feedback; this is the force adjustment of the chair back tilt. When only a single spring is working and the other springs are in a dormant state, it is the lightest gear, which is suitable for people with lighter weight and allows them to lie back easily; when the first adjustment piece closes the margin space to shorten the length of the second working position, the second spring works together with the first spring. This is the heavier gear, which can adapt to people with heavier weight and allow them to lie back while feeling a comfortable feedback force; according to demand, the number of second springs can be appropriately increased to accommodate people with heavier weight.

[0009] The different blocking parts on the second adjustment part can determine the telescopic stroke of the telescopic assembly. When the blocking part closer to the abutting part is aligned with the abutting part, the telescopic stroke of the telescopic assembly is shorter, which leads to a smaller reclining angle of the chair back. When the blocking part farther away is aligned with the abutting part, the telescopic stroke of the telescopic assembly is longer and the reclining angle of the chair back is larger, thereby realizing the adjustment of the reclining angle of the chair back, allowing the user to choose the reclining angle of the chair back in different scenarios, choose a larger reclining angle for better comfort when resting, and choose a smaller reclining angle to take into account both support and comfort when entertaining, such as playing with a mobile phone in a semi-reclining state.

[0010] Therefore, the device brings more diverse changes to the chair back tilting movement, thereby adapting to and meeting the various needs of various groups of people and improving the adaptability and usage experience of the seat.

[0011] Preferably, the telescopic assembly includes a base and a moving part which are sleeved with each other. When the telescopic assembly is extended or retracted, the base and the moving part slide relative to each other. The first working position and the second working position are formed between the base and the moving part. The moving part has a first mounting rod group and a second mounting rod group which is the same in number as the second working position. The base has a first sleeve and a second sleeve which is the same in number as the second working position. The first mounting rod group is arranged in the first sleeve, and the second mounting rod group is arranged in the second sleeve. The first spring is sleeved on the first mounting rod group and located in the first sleeve, and the second spring is sleeved on the second mounting rod group and located in the second sleeve. The base and the moving part are sleeved with each other and slide relative to each other, and the telescopic assembly is extended or retracted when the two slide relative to each other. The spring is sleeved on the mounting rod group and located in the sleeve, so that the spring can be stably in its respective working position.

[0012] Preferably, the moving part has a connection portion away from the base, the first mounting rod group and the second mounting rod group are arranged on the connection portion, the connection portion is arranged along a direction perpendicular to the telescopic direction of the telescopic assembly, and the first mounting rod group and the second mounting rod group are both arranged along the telescopic direction of the telescopic assembly. The connection portion is used to integrate the mounting rod group, making it more convenient to install the moving part and the base.

[0013] Preferably, the first mounting rod group includes a first fixed rod fixedly connected to the connecting portion and a first telescopic rod telescopically arranged with the first fixed rod, a first stopper is provided at one end of the first telescopic rod away from the connecting portion, and two ends of the first spring respectively abut against the connecting portion and the first stopper; the first stopper is located at the end of the first sleeve away from the connecting portion and abuts against the first sleeve, and when the first sleeve moves relative to the connecting portion, the first telescopic rod and the first fixed rod are telescoped, and the first stopper moves to drive the first spring to telescope. When the telescopic assembly is telescoped, the first telescopic rod and the first fixed rod are telescoped under the push of the sleeve, and the first stopper can drive the first spring to telescope; with this structure, the first spring can be more stably maintained on the first mounting rod group, and the first sleeve can make the connection between the moving part and the base more stable, thereby ensuring the stability of the operation of the telescopic assembly.

[0014] Preferably, the second mounting rod group includes a second fixed rod and a second stopper slidably arranged with the second fixed rod, and the two ends of the second spring are respectively abutted against the connecting portion and the second stopper; the first adjustment member is arranged on the base, and the margin space is formed in the second sleeve; when the first adjustment member leaves the margin space and the moving member and the base are telescoped, the second mounting rod group and the second spring move together with the connecting portion; when the first adjustment member enters the margin space and the moving member and the base are telescoped, the second stopper abuts against the second adjustment member, and the second stopper slides relative to the second fixed rod and drives the second spring to telescope. Generally speaking, the length of the second spring is shorter than the length of the first spring, so the length of the second mounting rod group is shorter, and the use of the telescopic rod solution may result in a limited telescopic stroke. In this solution, the second stopper and the second fixed rod are slidably arranged to prevent the telescopic stroke from being limited, and ensure that the telescopic stroke of the telescopic assembly is only related to the adjustment of the second adjustment member.

[0015] Preferably, a sliding seat is provided on the second sleeve, which is perpendicular to the telescopic direction of the telescopic assembly and outwardly protrudes. A sliding groove is provided on the sliding seat, which is connected to the inside of the second sleeve, and the first adjustment member is slidably arranged in the sliding groove. The first adjustment member is arranged in the sliding seat of the second sleeve and can leave and enter the margin space when sliding, so that the second spring can switch between the dormant state and the working state.

[0016] Preferably, the first adjusting member is plate-shaped and is provided with an escape groove for avoiding the second fixing rod. Since the second stopper is slidably arranged with the second fixing rod, when the second stopper slides to a position beyond the end of the second fixing rod, the escape groove can avoid the portion of the second fixing rod that exceeds the second stopper.

[0017] Preferably, the second stopper is provided with an enclosing portion, which encloses the end of the second spring, so that the second spring is more stably held on the second mounting rod set.

[0018] Preferably, the second adjustment member is arranged on the first sleeve of the base, and the second adjustment member includes an action portion for setting the blocking portion, and the blocking portions are all arranged on the action portion; a window is arranged on the first sleeve, and the action portion is slidably arranged in the window; the moving member also includes a sleeve, and the sleeve is inserted in the first sleeve, and the abutment portion is formed at the end of the sleeve; the blocking portion is aligned with the abutment portion in the first sleeve through the window. The second adjustment member is directly arranged on the first sleeve of the base, and acts on the abutment portion on the sleeve through the window opened thereon. When the second adjustment member slides, the position of the action portion in the window changes, and different blocking portions abut against the abutment portion; the sleeve is a part of the moving member, which makes the installation of the moving member and the base more convenient, and the sleeve can be directly inserted into the first sleeve; in addition, the sleeve is sleeved outside the first mounting rod group, and the first spring can also be directly set in the sleeve.

[0019] Preferably, the second adjusting member is U-shaped, and further comprises a vertical mounting portion and a horizontal sliding portion, the action portion is horizontal, and the action portion and the sliding portion are respectively located at the upper and lower ends of the mounting portion; an escape space for escaping the first sleeve is formed between the mounting portion, the sliding portion and the action portion, so as to facilitate the installation of the second adjusting member.

[0020] Preferably, a convex seat extends outward from the first sleeve, and the mounting portion is sleeved on the convex seat; the convex seat is perpendicular to the telescopic direction of the telescopic assembly, so that the second adjustment member can be stably slidably arranged on the first sleeve.

[0021] Preferably, the first sleeve and the second sleeve are integrally formed, which further facilitates the assembly of the telescopic assembly.

[0022] Preferably, the plurality of blocking parts include a first blocking part, a second blocking part, a third blocking part and a fourth blocking part which are located from far to near the abutting part, so that the reclining angle of the chair back can be adjusted to multiple gears, providing more choices for users and adapting to more usage scenarios.

[0023] A chassis includes a bottom shell, an armrest, a seat connecting piece and the above-mentioned device for adjusting the tilt angle and force of a chair back. The armrest is fixedly connected to the bottom shell, and the seat connecting piece is slidably arranged on the bottom shell. The telescopic component is arranged between the bottom shell and the seat connecting piece, and the telescopic component is rotatably connected to the bottom shell and the seat connecting piece. The seat connecting piece is configured to be used for installing a seat and to be linked with a chair back. When the chair back is tilted, the seat connecting piece slides on the bottom shell, and the telescopic component is telescoped accordingly.

[0024] Such a chassis makes the chair back tilt flexible and adaptable, able to adapt to people of different weights and different usage scenarios. It is more adaptable and functional and more competitive in the market.

[0025] Preferably, the first adjusting member and the second adjusting member are controlled by two sets of wire pulling mechanisms respectively.

[0026] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: The telescopic component acts on the chair back. When the chair back tilts backward, the telescopic component shortens. When the chair back is restored to an upright position and rotates forward, the telescopic component lengthens. Therefore, the telescopic component can adjust the tilt of the chair back. First, the telescopic component has multiple working positions, each of which is provided with a spring. The first working position is provided with a first spring. The first spring is always compressed as the telescopic component shortens. Therefore, it always acts on the tilting movement of the chair back to give feedback to the user. The springs provided in other working positions do not always act on the chair back. Only when the first adjustment member enters the working position to close the margin space, the springs in the working position The spring can be compressed as the chair back tilts, while also giving the user more feedback; this is the force adjustment of the chair back tilt. When only a single spring is working and the other springs are in a dormant state, it is the lightest gear, which is suitable for people with lighter weight and allows them to lie back easily; when the first adjustment piece closes the margin space to shorten the length of the second working position, the second spring works together with the first spring. This is the heavier gear, which can adapt to people with heavier weight and allow them to lie back while feeling a comfortable feedback force; according to demand, the number of second springs can be appropriately increased to accommodate people with heavier weight.

[0027] The different blocking parts on the second adjustment part can determine the telescopic stroke of the telescopic assembly. When the blocking part closer to the abutting part is aligned with the abutting part, the telescopic stroke of the telescopic assembly is shorter, which leads to a smaller reclining angle of the chair back. When the blocking part farther away is aligned with the abutting part, the telescopic stroke of the telescopic assembly is longer and the reclining angle of the chair back is larger, thereby realizing the adjustment of the reclining angle of the chair back, allowing the user to choose the reclining angle of the chair back in different scenarios, choose a larger reclining angle for better comfort when resting, and choose a smaller reclining angle to take into account both support and comfort when entertaining, such as playing with a mobile phone in a semi-reclining state.

[0028] Therefore, the device brings more diverse changes to the chair back tilting movement, thereby adapting to and meeting the various needs of various groups of people and improving the adaptability and usage experience of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the three-dimensional structure of the telescopic component in the embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the telescopic component in the embodiment of the present invention Figure 2 ; Figure 3 is a cross-sectional view of a telescopic assembly in an embodiment of the present invention; Figure 4 The three-dimensional structure of the chassis in the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 5 The three-dimensional structure of the chassis in the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 6 It is a schematic diagram of a three-dimensional structure in which a spring is arranged on a mounting rod assembly in an embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the integrally formed connecting portion, the first fixing rod, the second fixing rod and the sleeve in the embodiment of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure in which the second adjustment member is located on the base, the first telescopic rod is located in the first sleeve, and the second stopper is located in the second sleeve in an embodiment of the present invention; Fig. 9 The three-dimensional structure of the base in the embodiment of the present invention is shown in FIG. Figure 1 ; Fig.10 The three-dimensional structure of the base in the embodiment of the present invention is shown in FIG. Figure 2 ; Fig.11 is a schematic diagram of the three-dimensional structure of the first adjusting member in an embodiment of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the second adjusting member in an embodiment of the present invention.

[0030] The figures are marked as follows: telescopic assembly 1; first working position 101; second working position 102; margin space 1021; first spring 2; second spring 3; first adjusting member 4; avoidance groove 41; second adjusting member 5; action portion 51; mounting portion 52; sliding portion 53; blocking portion 6; abutment portion 7; bottom shell 8; armrest 9; seat connector 10; backrest connector 11; base 12; first sleeve 121; second sleeve 122; moving member 13; connecting portion 131; sleeve 132; first mounting rod group 14; first fixed rod 141; first telescopic rod 142; first stopper 143; second mounting rod group 15; second fixed rod 151; second stopper 152; surrounding portion 1521; extension rod 153; rotating groove 16; rotating portion 17; rotating shaft 18; sliding seat 19; sliding groove 20; window 21; protrusion 22; sliding groove 23. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of the present invention, the terms “first”, “second”, “third”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0034] The specific implementation of the present invention is as follows: like Figure 1-3 As shown, the present invention provides a device for adjusting the tilt angle and strength of a chair back, comprising a telescopic component 1, the telescopic component 1 acts on the chair back, and the telescopic component 1 is shortened when the chair back tilts backward; The telescopic assembly 1 has a first working position 101 and at least one second working position 102, the first working position 101 and the second working position 102 are arranged side by side and extend along the telescopic direction of the telescopic assembly 1; A first spring 2 is provided in the first working position 101, and a second spring 3 is provided in the second working position 102. The first spring 2 is configured so that when the telescopic assembly 1 is shortened, the first spring 2 is always compressed; The length occupied by the second spring 3 in the second working position 102 is smaller than the length of the second working position 102, and the unoccupied part of the second working position 102 is a margin space 1021; a first adjusting member 4 is provided on the telescopic assembly 1, and the first adjusting member 4 is slidably arranged on the telescopic assembly 1 and is located near the end of the margin space 1021 of the second spring 3, and the first adjusting member 4 selectively enters or leaves the margin space 1021 when sliding; when the first adjusting member 4 enters the margin space 1021, the second spring 3 is in a working state, and when the telescopic assembly 1 is shortened, the second spring 3 is compressed together with the first spring 2; when the first adjusting member 4 leaves the margin space 1021, the second spring 3 is in a dormant state, and when the telescopic assembly 1 is shortened, only the first spring 2 is compressed; The telescopic assembly 1 is also provided with a second adjusting member 5, which is slidably arranged on the telescopic assembly 1 in a direction perpendicular to the telescopic direction of the telescopic assembly 1; a plurality of blocking portions 6 are provided on the second adjusting member 5, and the plurality of blocking portions 6 are arranged along the sliding direction of the second adjusting member 5; in the telescopic direction of the telescopic assembly 1, different blocking portions 6 are located at different depths; the telescopic assembly 1 includes an abutting portion 7, and when the telescopic assembly 1 is shortened, the abutting portion 7 moves toward the second adjusting member 5; when the second adjusting member 5 slides, different blocking portions 6 are aligned with the abutting portion 7, and when the abutting portion 7 abuts against the blocking portion 6, the telescopic assembly 1 is prevented from further shortening.

[0035] The telescopic component 1 acts on the chair back. When the chair back tilts backward, the telescopic component 1 shortens. When the chair back is restored to an upright position and rotates forward, the telescopic component 1 lengthens. Therefore, the telescopic component 1 can adjust the tilt of the chair back. First, the telescopic component 1 has a plurality of working positions, each of which is provided with a spring. A first spring 2 is provided in the first working position 101. The first spring 2 is always compressed as the telescopic component 1 shortens. Therefore, it always acts on the tilting movement of the chair back to give feedback to the user. The springs provided in other working positions do not always act on the chair back. Only when the first adjustment member 4 enters the working position to close the margin space 1021, the working position The spring in the backrest can be compressed as the chair back is tilted, and at the same time, it also gives the user more feedback; this is the force adjustment of the chair back tilt. When only a single spring is in effect and the other springs are in a dormant state, it is the lightest gear, which is suitable for people with lighter weight and allows them to lie back easily; when the first adjustment member 4 closes the margin space 1021 to shorten the length of the second working position 102, the second spring 3 works together with the first spring 2. At this time, it is a heavier gear, which can adapt to people with heavier weight, allowing them to lie back while feeling a comfortable feedback force; according to needs, the number of second springs 3 can be appropriately increased to adapt to people with heavier weight.

[0036] The different blocking parts 6 on the second adjustment member 5 can determine the telescopic stroke of the telescopic component 1. When the blocking part 6 that is closer to the abutting part 7 is aligned with the abutting part 7, the telescopic stroke of the telescopic component 1 is shorter, which leads to a smaller reclining angle of the chair back. When the blocking part 6 that is farther away is aligned with the abutting part 7, the telescopic stroke of the telescopic component 1 is longer, and the reclining angle of the chair back is also larger, thereby realizing the adjustment of the reclining angle of the chair back, allowing the user to choose the reclining angle of the chair back in different scenarios, choose a larger reclining angle for better comfort when resting, and choose a smaller reclining angle to take into account both support and comfort when entertaining, such as playing with a mobile phone in a semi-reclining state.

[0037] Therefore, the device brings more diverse changes to the chair back tilting movement, thereby adapting to and meeting the various needs of various groups of people and improving the adaptability and usage experience of the seat.

[0038] Specifically, if Figure 4 , 5As shown, the device is applied to a chassis, including a bottom shell 8, an armrest 9, a seat connector 10 and the above-mentioned device, the armrest 9 is fixedly connected to the bottom shell 8, the seat connector 10 is slidably arranged on the bottom shell 8, the telescopic component 1 is arranged between the bottom shell 8 and the seat connector 10, and the telescopic component 1 is rotatably connected to the bottom shell 8 and the seat connector 10; the seat connector 10 is configured to be used for installing the seat and is linked with the chair back, when the chair back is tilted, the seat connector 10 slides on the bottom shell 8, and the telescopic component 1 is telescoped accordingly; such a chassis makes the chair back tilt flexible and changeable, can adapt to people of different weights and different usage scenarios, has stronger adaptability and functionality, and is more competitive in the market. The chassis also includes a backrest connector 11, which is rotatably connected to the armrest 9. At the same time, the backrest connector 11 is also rotatably connected to the seat connector 10 to achieve the linkage between the seat and the backrest. When the backrest tilts backward, the backrest connector 11 rotates forward, driving the seat connector 10 and the seat to slide forward on the bottom shell 8.

[0039] like Figure 1-3 As shown in 6-10, the telescopic assembly 1 includes a base 12 and a moving part 13 which are sleeved with each other. When the telescopic assembly 1 is extended or retracted, the base 12 and the moving part 13 slide relative to each other; a first working position 101 and a second working position 102 are formed between the base 12 and the moving part 13; the moving part 13 has a first mounting rod group 14 and a second mounting rod group 15 which is the same in number as the second working position 102; the base 12 has a first sleeve 121 and a second sleeve 122 which is the same in number as the second working position 102; the first mounting rod group 14 is arranged in the first sleeve 121, and the second mounting rod group 15 is arranged in the second sleeve 122; the first spring 2 is sleeved on the first mounting rod group 14 and located in the first sleeve 121, and the second spring 3 is sleeved on the second mounting rod group 15 and located in the second sleeve 122; in this embodiment, there is only one second working position 102, so there is only one second mounting rod group 15, the second sleeve 122 and the second spring 3, and only the state switching of the single second spring 3 can adapt to most weight groups, the setting is reasonable and saves unnecessary costs; the base 12 and the moving part 13 are sleeved and slid on each other, and the telescopic assembly 1 is telescoped when the two slide relative to each other. The spring is sleeved on the mounting rod group and located in the sleeve, so that the spring can be stably in its respective working position.

[0040] The moving part 13 also has a connecting portion 131 away from the base 12, and the first mounting rod group 14 and the second mounting rod group 15 are arranged on the connecting portion 131. The connecting portion 131 is arranged along a direction perpendicular to the telescopic direction of the telescopic component 1, and the first mounting rod group 14 and the second mounting rod group 15 are both arranged along the telescopic direction of the telescopic component 1; the connecting portion 131 is used to integrate the mounting rod group, so that the moving part 13 and the base 12 are more convenient to install; in this embodiment, the telescopic direction of the telescopic component 1 is the front-to-back direction, and the connecting portion 131 is arranged along the left-to-right direction. The base 12 is a shell, in which the first sleeve 121 and the second sleeve 122 are integrally formed, further simplifying the assembly of the telescopic component 1; the connecting portion 131 is located at the rear of the base 12, and the bottom shell 8 is an upwardly open shell. The moving part 13 and the base 12 are arranged in the bottom shell 8. An arc-shaped rotation groove 16 is opened at the rear end of the connecting portion 131 and faces the rear, and an arc-shaped rotation groove 16 is also opened at the front end of the base 12 and faces the front. A rotating portion 17 for rotating cooperation is provided on the seat connecting member, and the rotating portion 17 is arranged in the rotation groove 16 of the connecting portion 131 facing the front. A rotating shaft 18 is provided at the front end of the bottom shell 8, and the rotating shaft 18 is arranged in the rotation groove 16 of the base 12, thereby realizing the rotation connection between the telescopic component 1 and the seat connecting member 10 and the bottom shell 8. Driven by the chair back connecting member 11, the seat connecting member 10 will not only slide back and forth on the bottom shell 8 but also rotate, thereby realizing the smooth movement of the telescopic component 1.

[0041] like Figure 3 , 6 , 7, further, the first mounting rod group 14 includes a first fixed rod 141 fixedly connected to the connecting portion 131 and a first telescopic rod 142 telescopically arranged with the first fixed rod 141, the first fixed rod 141 and the connecting portion 131 are integrally formed, and are further back than the first telescopic rod 142, the first telescopic rod 142 is sleeved on the first fixed rod 141, and the two realize telescopic movement; a first stopper 143 is provided at one end of the first telescopic rod 142 away from the connecting portion 131, the first spring 2 is sleeved on the first fixed rod 141 and the first telescopic rod 142, and the two ends of the first spring 2 are respectively abutted on the connecting portion 131 and the first stopper 143; the first stopper 143 is located at the first telescopic rod The front end of 142, that is, the end of the first sleeve 121 away from the connecting portion 131, is in contact with the first sleeve 121, which can prevent the first telescopic rod 142 from being disengaged from the first fixed rod 141 under the action of the first spring 2; when the telescopic assembly 1 is telescoped and the first sleeve 121 moves relative to the connecting portion 131, the first telescopic rod 142 and the first fixed rod 141 are telescoped and extended under the push of the first sleeve 121, and the first stopper 143 moves to drive the first spring 2 to telescope; with this structure, the first spring 2 can be more stably maintained on the first mounting rod group 14, and the first sleeve 121 can make the connection between the moving part 13 and the base 12 more stable, thereby ensuring the stability of the operation of the telescopic assembly 1.

[0042] The structure of the second mounting rod group 15 is different from that of the first mounting rod group 14; the second mounting rod group 15 includes a second fixing rod 151 and a second stopper 152 slidably arranged with the second fixing rod 151, and the two ends of the second spring 3 are respectively abutted against the connecting portion 131 and the second stopper 152; further, the second fixing rod 151 is also fixedly provided with an extension rod 153, and the extension rod 153 is fixedly connected with the second fixing rod 151 by threads, and the second stopper 152 is specifically arranged on the extension rod 153, and the second spring 3 is sleeved on the second fixing rod 151, the extension rod 153 and the second stopper 152; the second stopper 152 is also provided with an enclosing portion 1521, and the enclosing portion 1521 encloses the end of the second spring 3, so that the second spring 3 is more stably maintained on the second mounting rod group 15. The first mounting rod group 14 and the second mounting rod group 15 are arranged side by side.

[0043] like Figure 3 , 8 -12, further, the first adjustment member 4 is arranged on the base 12, and the margin space 1021 is formed in the second sleeve 122, and the margin space 1021 is from the front end of the second stopper 152 to the front end of the second sleeve 122; when the first adjustment member 4 leaves the margin space 1021 and the moving member 13 and the base 12 are extended and retracted, the second mounting rod group 15 and the second spring 3 move together with the connecting portion 131, but the second spring 3 does not work; when the first adjustment member 4 enters the margin space 1021 and the moving member 13 and the base 1 When the second spring 3 is extended or retracted, the second stopper 152 abuts against the second adjusting member 5, and the second stopper 152 slides relative to the second fixing rod 151 and drives the second spring 3 to extend or retract. Generally speaking, the length of the second spring 3 is shorter than the length of the first spring 2, so the length of the second mounting rod group 15 is shorter. The use of the telescopic rod solution may result in a limited telescopic stroke. In this solution, the sliding arrangement of the second stopper 152 and the second fixing rod 151 is used to prevent the telescopic stroke from being limited, thereby ensuring that the telescopic stroke of the telescopic assembly 1 is only related to the adjustment of the second adjusting member 5.

[0044] Specifically, on the second sleeve 122, a sliding seat 19 is protruded outwardly perpendicular to the telescopic direction of the telescopic assembly 1. The sliding seat 19 is specifically protruded to the side of the second sleeve 122. A sliding groove 20 is opened on the sliding seat 19. The sliding groove 20 is connected with the inside of the second sleeve 122. The first adjustment member 4 is slidably arranged in the sliding groove 20. When sliding, it can leave and enter the margin space 1021, so that the second spring 3 can switch between the dormant state and the working state; when the first adjustment member 4 leaves the margin space 1021, it stays in the sliding groove 20; the first adjustment member 4 is plate-shaped, The first adjusting member 4 is provided with an avoidance groove 41 for avoiding the second fixing rod 151 and the extension rod 153. Since the second stopper 152 is slidably arranged with the second fixing rod 151 and the extension rod 153, when the second stopper 152 slides to a position beyond the end of the extension rod 153, the avoidance groove 41 can avoid the portion of the second fixing rod 151 and the extension rod 153 that exceeds the second stopper 152, that is, when the second spring 3 is compressed, the positions of the second stopper 152 and the first adjusting member 4 on the extension rod 153 will move forward relatively, and at this time the avoidance groove 41 can avoid the extension rod 153.

[0045] Furthermore, the second adjusting member 5 is arranged on the first sleeve 121 of the base 12, and the second adjusting member 5 includes an acting portion 51 for setting the blocking portion 6, and the blocking portions 6 are all arranged on the acting portion 51; the plurality of blocking portions 6 include a first blocking portion, a second blocking portion, a third blocking portion and a fourth blocking portion which are located from far to near the abutting portion 7, so that the angle adjustment of the chair back tilting forms multiple gears, and the user has more choices and adapts to more usage scenarios; the second adjusting member 5 is U-shaped, and the second adjusting member 5 also includes a vertical mounting portion 52 and a horizontal sliding portion 53, and the acting portion 51 is horizontal, and the acting portion 51 and the sliding portion 53 are respectively located at the upper and lower ends of the mounting portion 52; an avoidance space for avoiding the first sleeve 121 is formed between the mounting portion 52, the sliding portion 53 and the acting portion 51, so as to facilitate the installation of the second adjusting member 5; the acting portion 51 is arranged on the upper part of the first sleeve 121, and the sliding portion 53 is arranged on the lower part of the first sleeve 121.

[0046] The first sleeve 121 is provided with a window 21, which is located at the upper part of the first sleeve 121 and is open upward, and the action portion 51 is slidably arranged in the window 21; the moving member 13 also includes a sleeve 132, which is integrally formed with the connecting portion 131, and the sleeve 132 is located outside the first mounting rod group 14; the sleeve 132 is inserted into the first sleeve 121, and the abutment portion 7 is formed at the front end of the sleeve 132; the blocking portion 6 is aligned with the abutment portion 7 in the first sleeve 121 through the window 21; the second adjusting member 5 is directly arranged on the first sleeve 121 of the base 12, and the window 21 opened thereon acts on the abutment portion 7 on the sleeve 132, and the second adjusting member 5 is moved when sliding , the position of the action portion 51 in the window 21 is changed, and a different blocking portion 6 abuts against the abutting portion 7; the sleeve 132 is a part of the moving part 13, which makes the installation of the moving part 13 and the base 12 more convenient, and the sleeve 132 can be directly inserted into the first sleeve 121; in addition, the sleeve 132 is sleeved outside the first mounting rod group 14, and the first spring 2 can also be directly set in the sleeve 132; a boss 22 extends outward from the first sleeve 121, specifically, the boss 22 extends toward the side of the first sleeve 121, and the mounting portion 52 is sleeved on the boss 22; the boss 22 is perpendicular to the telescopic direction of the telescopic assembly 1, so that the second adjustment member 5 can be stably slidably set on the first sleeve 121. The sliding portion 53 is also provided with a blocking portion 6, so a downwardly open window 21 is also provided at the lower portion of the first sleeve 121; in addition, a sliding groove 23 for the sliding portion 53 to slide is also provided at the lower portion of the first sleeve 121, and the sliding portion 53 is arranged in the sliding groove 23.

[0047] Furthermore, the first adjusting member 4 and the second adjusting member 5 are respectively controlled by two sets of wire-pulling mechanisms; one set of the wire-pulling mechanisms has only two gears, and it is only necessary to control the first adjusting member 4 to enter or leave the margin space 1021. Specifically, a groove is opened on the sliding seat 19, and a hole is opened on the first adjusting member 4. A torsion spring is rotatably provided on the base 12 next to the sliding seat 19. One of the torsion spring arms of the torsion spring is connected to the wire-pulling mechanism, and the other torsion spring arm is inserted into the first adjusting member 4 through the sliding seat 19. The wire-pulling mechanism controls the rotation of the torsion spring to drive the first adjusting member 4 to slide.

[0048] Another set of wire pulling mechanisms has at least four gears and is directly connected to the sliding portion 53 of the second adjusting member 5 to control the sliding of the second adjusting member 5. One of the first blocking portion, the second blocking portion, the third blocking portion, and the fourth blocking portion can be selected to align with the abutment portion 7.

Claims

1. A device for adjusting the tilt angle and strength of a chair back, characterized in that: It includes a telescopic component, which acts on the seat back and shortens when the seat back is tilted backward; The telescopic assembly has a first working position and at least one second working position, the first working position and the second working position are arranged side by side and extend along the telescopic direction of the telescopic assembly; A first spring is provided in the first working position, and a second spring is provided in the second working position, wherein the first spring is configured so that when the telescopic assembly is shortened, the first spring is always compressed; The length occupied by the second spring in the second working position is smaller than the length of the second working position, and the unoccupied part of the second working position is the margin space; a first adjusting member is provided on the telescopic assembly, the first adjusting member is slidably arranged on the telescopic assembly and the first adjusting member is located near the margin space end of the second spring, and the first adjusting member selectively enters or leaves the margin space when sliding; when the first adjusting member enters the margin space, the second spring is in a working state, and when the telescopic assembly is shortened, the second spring is compressed together with the first spring; when the first adjusting member leaves the margin space, the second spring is in a dormant state, and when the telescopic assembly is shortened, only the first spring is compressed; The telescopic assembly is also provided with a second adjusting member, which is slidably arranged on the telescopic assembly in a direction perpendicular to the telescopic direction of the telescopic assembly; a plurality of blocking parts are provided on the second adjusting member, which are arranged along the sliding direction of the second adjusting member; in the telescopic direction of the telescopic assembly, different blocking parts are located at different depths; the telescopic assembly includes an abutting part, and when the telescopic assembly is shortened, the abutting part moves toward the second adjusting member; when the second adjusting member slides, different blocking parts are aligned with the abutting part, and when the abutting part abuts against the blocking part, the telescopic assembly is prevented from further shortening.

2. The device for adjusting the reclining angle and strength of a chair back according to claim 1, characterized in that: The telescopic component includes a base and a moving part which are sleeved with each other. When the telescopic component is telescoped, the base and the moving part slide relative to each other; the first working position and the second working position are formed between the base and the moving part; the moving part has a first mounting rod group and a second mounting rod group with the same number as the second working position, the base has a first sleeve and a second sleeve with the same number as the second working position, the first mounting rod group is arranged in the first sleeve, and the second mounting rod group is arranged in the second sleeve; the first spring is sleeved on the first mounting rod group and is located in the first sleeve, and the second spring is sleeved on the second mounting rod group and is located in the second sleeve.

3. The device for adjusting the reclining angle and strength of a chair back according to claim 2, characterized in that: The moving part has a connecting portion away from the base, the first mounting rod group and the second mounting rod group are arranged on the connecting portion, the connecting portion is arranged along a direction perpendicular to the telescopic direction of the telescopic assembly, and the first mounting rod group and the second mounting rod group are both arranged along the telescopic direction of the telescopic assembly.

4. The device for adjusting the reclining angle and strength of a chair back according to claim 3, characterized in that: The first mounting rod group includes a first fixed rod fixedly connected to the connecting part and a first telescopic rod telescopically arranged with the first fixed rod. A first stopper is provided at one end of the first telescopic rod away from the connecting part, and two ends of the first spring respectively abut against the connecting part and the first stopper; the first stopper is located at the end of the first sleeve away from the connecting part and abuts against the first sleeve. When the first sleeve moves relative to the connecting part, the first telescopic rod and the first fixed rod are telescoped, and the first stopper moves to drive the first spring to telescope.

5. The device for adjusting the reclining angle and strength of a chair back according to claim 3, characterized in that: The second mounting rod group includes a second fixed rod and a second stop block slidably arranged with the second fixed rod, and the two ends of the second spring respectively abut against the connecting part and the second stop block; the first adjusting member is arranged on the base, and the margin space is formed in the second sleeve; when the first adjusting member leaves the margin space and the moving member and the base are telescoped, the second mounting rod group and the second spring move together with the connecting part; when the first adjusting member enters the margin space and the moving member and the base are telescoped, the second stop block abuts against the second adjusting member, and the second stop block slides relative to the second fixed rod and drives the second spring to telescope.

6. The device for adjusting the reclining angle and strength of a chair back according to claim 5, characterized in that: On the second sleeve, a sliding seat is protruded outwardly perpendicular to the telescopic direction of the telescopic assembly. The sliding seat is provided with a sliding groove, which is connected to the inside of the second sleeve. The first adjustment member is slidably arranged in the sliding groove.

7. The device for adjusting the reclining angle and strength of a chair back according to claim 5, characterized in that: The first adjusting member is in a plate shape and is provided with an avoidance groove for avoiding the second fixing rod.

8. The device for adjusting the reclining angle and strength of a chair back according to claim 5, characterized in that: The second stopper is provided with an enclosing portion, which encloses the end of the second spring.

9. The device for adjusting the reclining angle and strength of a chair back according to claim 2, characterized in that: The second adjusting member is arranged on the first sleeve of the base, and the second adjusting member includes an acting part for setting the blocking part, and the blocking part is arranged on the acting part; a window is arranged on the first sleeve, and the acting part is slidably arranged in the window; the moving member also includes a sleeve, and the sleeve is inserted in the first sleeve, and the abutment part is formed at the end of the sleeve; the blocking part is aligned with the abutment part in the first sleeve through the window.

10. The device for adjusting the reclining angle and strength of a chair back according to claim 9, characterized in that: The second adjustment member is U-shaped, and also includes a vertical mounting portion and a horizontal sliding portion. The action portion is horizontal, and the action portion and the sliding portion are respectively located at the upper and lower ends of the mounting portion; an avoidance space for avoiding the first sleeve is formed between the mounting portion, the sliding portion and the action portion.

11. The device for adjusting the reclining angle and strength of a chair back according to claim 10, characterized in that: A convex seat is extended outwardly from the first sleeve, and the mounting portion is sleeved on the convex seat; the convex seat is perpendicular to the telescopic direction of the telescopic assembly.

12. The device for adjusting the reclining angle and strength of a chair back according to claim 2, characterized in that: The first sleeve and the second sleeve are integrally formed.

13. The device for adjusting the reclining angle and strength of a chair back according to claim 1, characterized in that: The plurality of blocking parts include a first blocking part, a second blocking part, a third blocking part and a fourth blocking part which are located from far to near the abutting part.

14. A chassis, characterized in that: It includes a bottom shell, an armrest, a seat connector and a device for adjusting the tilt angle and force of the chair back as described in any one of claims 1-13, the armrest is fixedly connected to the bottom shell, the seat connector is slidably arranged on the bottom shell, the telescopic component is arranged between the bottom shell and the seat connector, and the telescopic component is rotatably connected to the bottom shell and the seat connector; the seat connector is configured to be used for installing the seat and to be linked with the chair back, when the chair back is tilted, the seat connector slides on the bottom shell, and the telescopic component is telescoped accordingly.

15. The chassis according to claim 14, characterized in that: The first adjusting member and the second adjusting member are respectively controlled by two sets of wire pulling mechanisms.

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