Method for quickly adjusting tipping elasticity of chair back

Abstract

The invention discloses a method for quickly adjusting the tipping elasticity of a chair back, which comprises the following steps of: utilizing a linear motion device arranged along the front-back or up-down direction, linking one end of the linear motion device with the chair back, arranging at least two elastic pieces arranged in the same direction in the linear motion device, arranging a sliding block between the adjacent elastic pieces, and arranging a controllable blocking piece beside the sliding block; the elastic force is adjusted by controlling the blocking piece to be switched between the blocking position and the avoiding position, the sliding block is static during blocking, only the elastic piece between the linkage end and the sliding block works, and the elastic force is increased; during avoiding, the sliding block slides, the elastic pieces on the two sides of the sliding block are connected in series to work, and the elastic force becomes small; according to the method, gears are divided according to body weight, elasticity is determined according to the number of serial elastic pieces, the working gear of a single elastic piece is the maximum, one gear is reduced when one serial elastic piece is added, operation is easy and fast, and the use experience is improved.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a method for quickly adjusting the elastic force of a chair back. Background Art

[0002] In existing seats, seat back reclining has almost become a must-have function and one of the core elements to improve user comfort. The elastic adjustment performance during the reclining process directly affects the operating experience and safety sense of users of different weights. However, the seat back reclining elastic adjustment solutions of existing seats generally have problems with insufficient functional adaptability and poor operational convenience, making it difficult to meet diverse usage needs.

[0003] In addition to providing cushioning force when the seat back is tilted back and auxiliary reset force when the seat back is restored, the elastic device in the seat should also be able to adjust the elastic force according to the weight of different users. Light users may find it difficult to lean back due to excessive elastic force, while heavy users may lose control of their leaning due to insufficient elastic force, which not only affects the smoothness of operation but also poses a safety hazard. In particular, the method of adjusting the elastic force has obvious defects. The most common method is to change the spring preload by manually rotating the knob. The adjustment requires multiple rotations, which takes a long time and cannot quickly match the user's weight requirements. Users often resist the cumbersome adjustment operation and are unwilling to make adjustments. Therefore, a method that can quickly adjust the elastic force is needed. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a method for quickly adjusting the size of the elastic force of the chair back tilt, using a linear motion device arranged in the front-to-back or up-down direction, one end of which is linked to the chair back, and has at least two elastic parts arranged in the same direction, a slider between adjacent elastic parts, and a controllable blocking part next to the slider; the elastic force is adjusted by controlling the blocking part to switch between blocking and avoidance positions: when blocking, the slider is stationary, and only the elastic part between the linkage end and the slider works, and the elastic force becomes larger; when avoiding, the slider slides, and the elastic parts on both sides of the slider work in series, and the elastic force becomes smaller; this method divides gears according to body weight, and determines the elastic force according to the number of elastic parts in series. A single elastic part works at the maximum gear, and each additional elastic part in series reduces one gear. The operation is simple and fast, and the user experience is improved.

[0005] The technical solution of the present invention is achieved as follows: A method to quickly adjust the elastic force of the chair back: A linear motion device providing elastic force is arranged in a front-to-back or up-to-down direction, so that one end of the linear motion device is linked to the chair back, and the linear motion device can move and provide elastic force in response to the backward tilting movement of the chair back; one end of the linear motion device linked to the chair back is a linkage end, and when the chair back rotates to tilt backward, the force is transmitted from the linkage end to the other end; at least two elastic members are arranged in the same direction in the linear motion device, and a floating member is provided between each two elastic members, so that the floating member elastically abuts against the elastic members on both sides; a controllable blocking member is provided next to each floating member, and the blocking member is controlled to switch between a blocking position and an avoidance position by controlling the movement of the blocking member to block or avoid the floating member; when the elastic force of the chair back tilting is increased, the blocking member is switched to the blocking position, so that the floating member is stationary, and only the elastic member between the linkage end and the floating member provides elastic force in response to the force of the chair back tilting backward; when the elastic force of the chair back tilting is reduced, the blocking member is switched to the avoidance position, so that the floating member slides, and the elastic members on both sides of the floating member can provide elastic force in response to the force of the chair back tilting backward.

[0006] In this method, the weight of different users is divided into multiple ranges, and multiple gears are set corresponding to the multiple ranges. Each gear provides different elastic forces, and the size of the elastic force is determined by the number of elastic parts that are in effect. Multiple elastic parts are connected in series or isolated through the relationship between the floating part and the blocking part; when the blocking part is in the blocking position, the elastic parts on both sides of the floating part are isolated from each other, and only the elastic parts between the linkage end and the floating part provide elastic force. The number of elastic parts in series is reduced, but the elastic force is increased; similarly, when the blocking part is in the avoidance position, the elastic parts on both sides of the floating part are connected in series to increase the number of elastic parts in series and reduce the elastic force; during operation, the user only needs to switch the blocking part between the two positions to adjust the size of the elastic force of the chair backrest, which is simple and fast, and the user experience is better.

[0007] In this solution, the size of the elastic force is not determined by the superposition of the elastic parts, but by whether the elastic parts are in a series state. The elastic force provided by the elastic parts in the series state will be smaller; when the compression amount (that is, the relative movement amount between the first part and the second part) and the elastic coefficient are the same, the elastic force provided by only a single elastic part will be twice that of when the two elastic parts work together; accordingly, the gears are divided according to the range of the user's weight, that is, the number of elastic parts can be selected according to actual conditions. When only a single elastic part is working, it is the largest elastic force gear. When two elastic parts work in series, it is the second largest elastic force gear. When three elastic parts work in series, it is the third largest elastic force gear, and so on. Whether the elastic part is in a series state is determined by whether the floating part moves. When adjusting, you only need to control the state of the floating part, so that the elastic force adjustment is simple and quick.

[0008] Preferably, the elastic members in the linear motion device are coaxially and selectively arranged in series, and the number of elastic members in series is changed according to whether the floating member is in a stationary or sliding state; when the floating member is switched to a stationary state, the number of elastic members in series decreases and the elastic force increases, and when the floating member is switched to a sliding state, the number of elastic members in series increases and the elastic force decreases.

[0009] As an advantage, the elastic member between the floating member closest to the linkage end and the linkage end is always able to expand and contract in response to the rotation of the chair back. When the chair back tilts backward, the linear motion device is always in a movable state and can always provide a tilting elastic force.

[0010] Preferably, when the blocking member is in the avoidance position, the floating member is acted upon by the elastic members on both sides thereof to float in the linear motion device. This allows the floating member to move. When the floating member is in the movable position, in response to the force of the chair back tilting backward, the elastic members on both sides of the floating member are compressed, causing the floating member to move.

[0011] Preferably, the floating member is provided with a plurality of steps, with the distance between the end surface of each step and the blocking member varying, with the distance between the step and the blocking member increasing as the step approaches the blocking position. The varying distances between the end surface of the step and the blocking member allow the blocking member to abut against the floating member to prevent it from sliding even when the floating member stops with a deviation.

[0012] Preferably, when multiple floating members are provided, the order in which the floating members are blocked by increasing the seatback reclining elastic force begins with the floating member furthest from the linkage end. When multiple floating members are provided, the order in which the floating members are released by reducing the seatback reclining elastic force begins with the floating member closest to the linkage end. This approach allows the number of elastic members connected in series to increase or decrease sequentially, thereby achieving gear division.

[0013] Preferably, each floating member is connected to a corresponding transmission member, and all the transmission members are connected to a control member, so that each transmission member moves in an orderly manner in response to the movement of the control member and drives the floating members to slide in an orderly manner.

[0014] Preferably, each transmission member is connected to a corresponding control slot, with each control slot spaced apart along the direction of movement of the control member. The control slot has a stationary section and an active section, with the stationary section extending in the same direction as the movement of the control member, and the active section tilted relative to the stationary section. When the control member moves, the transmission member remains stationary if in the stationary section and moves if in the active section. This method is simple and ingenious; simply by providing an active section with an inclined angle in the control slot to drive the transmission member's movement, and by arranging the stationary sections in the control slot according to the sequence of movement, orderly movement of the transmission member can be achieved.

[0015] Preferably, all transmission members are rotatably mounted on the second component of the linear motion device, and the control member is slidably mounted on the second component, so that the sliding direction of the control member is the same as the moving direction of the linear motion device.

[0016] Preferably, a cable is used to drive the movement of the control member.

[0017] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: In this method, the weight of different users is divided into multiple ranges, and multiple gears are set corresponding to the multiple ranges. Each gear provides different elastic forces, and the size of the elastic force is determined by the number of elastic parts that are in effect. Multiple elastic parts are connected in series or isolated through the relationship between the floating part and the blocking part; when the blocking part is in the blocking position, the elastic parts on both sides of the floating part are isolated from each other, and only the elastic parts between the linkage end and the floating part provide elastic force. The number of elastic parts in series is reduced, but the elastic force is increased; similarly, when the blocking part is in the avoidance position, the elastic parts on both sides of the floating part are connected in series to increase the number of elastic parts in series and reduce the elastic force; during operation, the user only needs to switch the blocking part between the two positions to adjust the size of the elastic force of the chair backrest, which is simple and fast, and the user experience is better.

[0018] In this solution, the size of the elastic force is not determined by the superposition of the elastic parts, but by whether the elastic parts are in a series state. The elastic force provided by the elastic parts in the series state will be smaller; when the compression amount (that is, the relative movement amount between the first part and the second part) and the elastic coefficient are the same, the elastic force provided by only a single elastic part will be twice that of when the two elastic parts work together; accordingly, the gears are divided according to the range of the user's weight, that is, the number of elastic parts can be selected according to actual conditions. When only a single elastic part is working, it is the largest elastic force gear. When two elastic parts work in series, it is the second largest elastic force gear. When three elastic parts work in series, it is the third largest elastic force gear, and so on. Whether the elastic part is in a series state is determined by whether the floating part moves. When adjusting, you only need to control the state of the floating part, so that the elastic force adjustment is simple and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of a seat using a linear motion device in an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of a seat using a linear motion device in an embodiment of the present invention Figure 2 ; Figure 3 This is a schematic diagram of a three-dimensional structure in which a linear motion device is disposed between a seat and a bottom shell in an embodiment of the present invention; Figure 4This is a schematic diagram of the three-dimensional structure of the device when the additional elastic members are all in working state in the embodiment of the present invention; Figure 5 This is a cross-sectional view of the device when the additional elastic members in the embodiment of the present invention are all in working state; Figure 6 is a schematic diagram of the three-dimensional structure of the device when only the second attachment is in a stationary state in an embodiment of the present invention; Figure 7 is a cross-sectional view of the device when only the second attachment is in a stationary state in an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the device when only the basic attachment is in a working state in an embodiment of the present invention; Figure 9 is a cross-sectional view of the device when only the basic attachment is in the working state in the embodiment of the present invention; Figure 10 Schematic diagram of the three-dimensional structure of the first component in an embodiment of the present invention; Figure 11 Schematic diagram of the three-dimensional structure of the floating member in an embodiment of the present invention; Figure 12 Schematic diagram of the three-dimensional structure of the blocking member in an embodiment of the present invention; Figure 13 Schematic diagram of the three-dimensional structure of the second component in the embodiment of the present invention; Figure 14 is a schematic diagram of the three-dimensional structure when all floating members are blocked by blocking members in an embodiment of the present invention; Figure 15 A schematic diagram of the coaxial serial arrangement of elastic members in an embodiment of the present invention; Figure 16 Schematic diagram of the structure of the control component in an embodiment of the present invention.

[0020] The reference numerals are as follows: linear motion device 100; first component 1; limiting column 11; extension shaft 12; insertion hole 13; second component 2; circular groove 21; slot 22; basic elastic member 3; additional elastic member 4; first additional elastic member 4a; second additional elastic member 4b; floating member 5; first floating member 5a; second floating member 5b; annular groove 8; stepped portion 9; blocking member 6; first blocking member 6a; second blocking member 6b; avoidance groove 15; first transmission member 1 6; second transmission member 17; support arm 18; control member 19; first control slot 20; first stationary section 201; first active section 202; second control slot 23; second stationary section 231; second active section 232; long slot 24; guide shaft 25; pull wire 26; ridge 27; chair back 200; seat 300; extension portion 301; mounting slot 302; mounting seat 303; limiting slot 304; bottom shell 400; ridge 401; circular shaft 402. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objects, 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, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0022] 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 scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0023] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] The specific implementation of the present invention is as follows: like Figure 4 、 6 As shown in , 8, and 16, the present invention provides a method for quickly adjusting the elastic force of the chair backrest: The linear motion device 100 providing elastic force is arranged in the front-to-back or up-down direction, so that one end of the linear motion device 100 is linked with the chair back 200. The linear motion device 100 can move and provide elastic force in response to the backward tilting movement of the chair back 200. The end of the linear motion device 100 linked with the chair back 200 is a linkage end. When the chair back 200 tilts and rotates backward, the force is transmitted from the linkage end to the other end. At least two elastic members are arranged in the same direction in the linear motion device 100. A floating member 5 is provided between each of the two elastic members so that the floating member 5 elastically contacts the elastic members on both sides. A controllable blocking member 6 is provided beside the floating member 5, and the movement of the blocking member 6 is controlled to switch the blocking member 6 between the blocking position and the avoidance position to block or avoid the floating member 5; when the elastic force of the chair back 200 is increased, the blocking member 6 is switched to the blocking position, so that the floating member 5 is stationary, and only the elastic member between the linkage end and the floating member 5 responds to the force of the chair back 200 tilting backward and provides elastic force; when the elastic force of the chair back 200 is reduced, the blocking member 6 is switched to the avoidance position, so that the floating member 5 slides, and the elastic members on both sides of the floating member 5 can respond to the force of the chair back 200 tilting backward and provide elastic force.

[0025] In this method, the weight of different users is divided into multiple ranges, and multiple gears are set corresponding to the multiple ranges. Each gear provides different elastic forces, and the size of the elastic force is determined by the number of elastic parts that are in effect. Multiple elastic parts are connected in series or isolated through the relationship between the floating part 5 and the blocking part 6; when the blocking part 6 is in the blocking position, the elastic parts on both sides of the floating part 5 are isolated from each other, and only the elastic parts between the linkage end and the floating part 5 provide elastic force. The number of elastic parts in series is reduced, but the elastic force is increased; similarly, when the blocking part 6 is in the avoidance position, the elastic parts on both sides of the floating part 5 are connected in series to increase the number of elastic parts in series and reduce the elastic force; during operation, the user only needs to switch the blocking part 6 between the two positions to adjust the size of the elastic force of the chair back 200 degrees. It is simple and fast, and the user experience is better.

[0026] Furthermore, the elastic members in the linear motion device 100 are coaxially and selectively arranged in series, and the number of elastic members in series is changed according to whether the floating member 5 is in a stationary or sliding state; when the floating member 5 is switched to a stationary state, the number of elastic members in series is reduced and the elastic force is increased, and when the floating member 5 is switched to a sliding state, the number of elastic members in series is increased and the elastic force is reduced; so that the elastic members between the floating member 5 closest to the linkage end and the linkage end can always be extended and retracted in response to the rotation of the chair back 200; when the chair back 200 tilts backward, the linear motion device 100 is always in a movable state and can always provide a tilting elastic force; when the blocking member 6 is in the avoidance position, the floating member 5 is floated in the linear motion device 100 under the action of the elastic members on both sides, so that the floating member 5 has the ability to move, and when the floating member 5 is in a movable state, in response to the force of the chair back 200 tilting backward, the elastic members on both sides of the floating member 5 will be compressed, causing the floating member 5 to move.

[0027] Regarding the control sequence: when there are multiple floating parts 5, the order of increasing the tilting elastic force of the seat back 200 and blocking the floating parts 5 is from the floating part 5 farthest from the linkage end; when there are multiple floating parts 5, the order of reducing the tilting elastic force of the seat back 200 and releasing the floating parts 5 is from the floating part 5 closest to the linkage end; only by the above method can the number of elastic parts connected in series be increased or decreased in sequence, thereby realizing the division of gears; further, each floating part 5 is respectively connected to a corresponding transmission part, and all the transmission parts are connected to a control part 19, so that each transmission part responds to the movement of the control part 19 and moves in an orderly manner and drives the floating parts 5 to slide in an orderly manner; each transmission part is respectively connected to a corresponding control groove, and each control groove is arranged on the control part 19 at intervals along the movement direction of the control part 19; the control groove has a static section and an action section, so that the extension direction of the static section is the same as the movement direction of the control part 19, and the action section is tilted relative to the static section; when the control part 19 moves, if the transmission part is in the static section, it remains static, and if it is in the action section, it moves. This method is simple and clever. It only requires setting an action segment with an inclined angle in the control groove to drive the transmission part to move, and arranging the position of the static segment in the control groove according to the movement sequence to achieve orderly movement of the transmission part.

[0028] Describe it specifically in terms of structure, such as Figure 3 、 4 As shown in Figures 14 and 15, the linear motion device 100 includes a first component 1, a second component 2, a basic elastic member 3, and at least one additional elastic member 4. The basic elastic member 3 and the additional elastic member 4 are arranged in the same direction, and the first component 1 and the second component 2 are configured to move relative to each other. A floating member 5 is provided between the basic elastic member 3 and the additional elastic member 4. The basic elastic member 3 is located between the first component 1 and the floating member 5, and the additional elastic member 4 is located between the floating member 5 and the second component 2. The floating member 5 is configured to selectively move or remain stationary relative to the second component 2. When the floating member 5 and the second component 2 are stationary relative to each other, only the basic elastic member 3 deforms in response to the movement of the first component 1 and the second component 2. When the floating member 5 and the second component 2 move relative to each other, both the basic elastic member 3 and the additional elastic member 4 can deform in response to the movement of the first component 1 and the second component 2. In this embodiment, the floating member 5 is a slider.

[0029] First, the basic elastic member 3 is always in a working state in the device, that is, the elastic basis of the device, ensuring that the device can always provide elastic force; the additional elastic member 4 can switch between a working state and a static state under the action of the floating member 5, that is, when the floating member 5 and the second component 2 move relative to each other, the two elastic members are in a linkage state, and the additional elastic member 4 can be deformed together with the basic elastic member 3, and at this time, the elastic force that the device can provide is smaller; when the floating member 5 and the second component 2 are relatively stationary, the additional elastic member 4 and the basic elastic member 3 are separated by the floating member 5, the additional elastic member 4 is stationary and no longer provides elastic force, and the elastic force is only provided by the basic elastic member 3, and at this time, the elastic force provided by the basic elastic member 3 is greater.

[0030] In addition, in this solution, the linear motion device 100 is modularized so that the first component 1 and the second component 2 are respectively connected to the movable component and the fixed component that need to be adjusted for the furniture, providing elastic force when the movable component moves, and being able to perform rapid elastic force adjustment, with better functional adaptability.

[0031] In this solution, the size of the elastic force is not determined by the superposition of the elastic parts, but by whether the elastic parts are in a series state. The elastic force provided by the elastic parts in the series state will be smaller; when the compression amount (i.e. the relative movement amount of the first component 1 and the second component 2) and the elastic coefficient are the same, the elastic force provided by only the basic elastic part 3 will be twice that when the basic elastic part 3 and the additional elastic part 4 work together; accordingly, the gears are divided according to the adaptability range (such as the user's weight range), that is, the number of additional elastic parts 4 can be selected according to actual conditions. When only the basic elastic part 3 is working, it is the largest elastic force gear. When two elastic parts are working in series, it is the second largest elastic force gear. When three elastic parts are working in series, it is the third largest elastic force gear, and so on. Whether the additional elastic part 4 is in a series state is determined by whether the floating part 5 moves. When adjusting, it is only necessary to control the state of the floating part 5, so that the elastic force adjustment is simple and quick.

[0032] To achieve the above effect and connect the elastic parts in series, the elastic parts need to be arranged in the same direction rather than arranged side by side at intervals. For example, when the relative movement direction of the first component 1 and the second component 2 is the front-to-back direction, the elastic parts are all arranged in the front-to-back direction rather than arranged left-to-right at intervals.

[0033] like Figure 1-3As shown, the device is applied to a chair, which includes a chair back 200, a seat 300, a bottom shell 400 and the linear motion device 100 as described above, the chair back 200 is rotatably set on the bottom shell 400, the seat 300 is slidably set on the bottom shell 400 and is linked with the chair back 200, and the linear motion device 100 is set between the seat 300 and the bottom shell 400 along the front and rear directions; the first component 1 is connected to the seat 300, and the second component 2 is connected to the bottom shell 400; when the chair back 200 tilts backward, the seat 300 slides forward on the bottom shell 400 and causes the first component 1 to move close to the second component 2.

[0034] The device is applied to a seat to provide a buffering elastic force when the chair back 200 tilts backward, and to provide an auxiliary restoring force when the chair back 200 rotates forward to restore the upright position, and the device can quickly adjust the elastic force according to the weight of the user; the device is modular and can be applied to different seats; when the elastic member works, it can be compressed or extended. In this solution, when the chair back 200 tilts backward, the seat 300 moves forward, and the elastic member is compressed to provide elastic force; in the process of the chair back 200 restoring the upright position, although the elastic member is extended, the elastic member also assists the seat 300 to move backward and the chair back 200 to restore the upright position by compressing the stored elastic force.

[0035] Specifically, if Figure 4 、 5 As shown in Figures 10-13, the left and right ends of the bottom shell 400 have upwardly extending protrusions 401, and the chair back 200 is rotatably connected to the protrusions 401; the seat portion 300 has an upwardly extending extension portion 301, and the chair back 200 is rotatably connected to the extension portion 301, so that when the chair back 200 tilts backward, the seat portion 300 is driven to slide forward on the bottom shell 400, and when the chair back 200 tilts forward, the seat portion 300 is driven to slide backward on the bottom shell 400; the seat portion 300 is provided with rectangular mounting grooves 302 arranged front and back, and the linear motion device 100 is installed into the installation groove 302 and arranged along the front-to-back direction; a concave installation seat 303 is provided at the rear end of the installation groove 302, and a limiting groove 304 is opened on the installation seat 303. The first component 1 is block-shaped, and the left and right end faces of the first component 1 are provided with limiting columns 11. When the device is installed in the installation groove 302, the limiting columns 11 enter the limiting groove 304; the upper part of the limiting groove 304 extends vertically from top to bottom, and the lower part thereof is inclined backward from top to bottom. Under the action of the elastic force of the device itself, the limiting column 11 is located at the lower end of the limiting groove 304 and is not easy to detach therefrom.

[0036] The second component 2 is a sleeve, and a circular groove 21 is provided at the front end of the second component 2. A circular shaft 402 is arranged in the left and right directions at the front of the bottom shell 400. The circular shaft 402 abuts against the circular groove 21. During the telescopic movement, the device is adaptively rotated to prevent interference. A linear motion device 100 is provided on each of the left and right sides of the seat 300 and the bottom shell 400. If only one linear motion device 100 is provided, it can be set in the middle. In this embodiment, linear motion devices 100 are provided on both the left and right sides to maintain uniform and stable force.

[0037] Furthermore, there are two additional elastic members 4, namely the first additional elastic member 4a and the second additional elastic member 4b. The elastic members are all springs. In addition to the common telescopic springs, curved spring plates can also be used as elastic members; the two additional elastic members 4 are both arranged in the second component 2, and there are also two corresponding floating members 5, namely the first floating member 5a and the second floating member 5b. The floating members 5 are both arranged in the second component 2, and the basic elastic member 3 is exposed outside the second component 2 and is located between the first component 1 and the second component 2; corresponding to the two floating members 5, two blocking members 6 are also provided in the second component 2, namely the first blocking member 6a and the second blocking member 6b. The floating member 5 and the additional elastic member 4 are both arranged along the axial direction of the second component 2, and the blocking member 6 is arranged to slide radially along the sleeve; the second component 2 is a sleeve, which has an accommodating function, so that the additional elastic member 4, the floating member 5, the blocking member 6, etc. can be stably installed; the blocking member is perpendicular to the sliding direction of the floating member.

[0038] The second component 2 is provided with two slots 22 spaced apart in front and back corresponding to the two blocking members 6. The two slots 22 are arranged radially along the second component 2 and pass through to the interior of the second component 2. The blocking member 6 is slidably arranged in the slots 22. When the blocking member 6 is only located in the slots 22, the blocking member 6 is in an avoidance position. When the blocking member 6 enters the second component 2, it is in a blocking position. The end of the floating member 5 is located beside the slots 22. The blocking member 6 is arranged beside the floating member 5 along the movement direction of the first component 1 and the second component 2. The blocking member 6 enters or leaves the interior of the sleeve through the slots 22 to block or avoid the floating member 5. When the blocking member 6 slides between the floating member 5 and the second component 2, the blocking member 6 will float. The moving part 5 blocks, and the floating part 5 and the second part 2 are relatively stationary; when the blocking part 6 slides to leave between the floating part 5 and the second part 2, the blocking part 6 releases the floating part 5, and the floating part 5 moves relative to the second part 2; the movement and stillness of the floating part 5 are controlled by the blocking part 6, and the operation is simple and fast; when the floating part 5 moves, the series connection of the additional elastic part 4 and the basic elastic part 3 takes effect, and when the floating part 5 is stationary, the series connection of the additional elastic part 4 and the basic elastic part 3 fails, and the additional elastic part 4 no longer works; an avoidance groove 15 for avoiding the additional elastic part 4 is provided on the blocking part 6; the existence of the avoidance groove 15 can prevent the blocking part 6 from affecting the elastic part, and the shape of the blocking part 6 can be U-shaped.

[0039] like Figure 14 、 15As shown, the basic elastic member 3 and the additional elastic member 4 are coaxially arranged; the coaxial arrangement is a series arrangement method that saves volume; the second additional elastic member 4b is closer to the second component 2 than the first additional elastic member 4a; the floating member 5 between the basic elastic member 3 and the first additional elastic member 4a is the first floating member 5a, and the floating member 5 between the first additional elastic member 4a and the second additional elastic member 4b is the second floating member 5b. The first floating member 5a is provided with the first blocking member 6a, and the second floating member 5b is provided with the second blocking member Part 6b, the first blocking member 6a is located between the first floating member 5a and the second floating member 5b, and the second blocking member 6b is located between the second floating member 5b and the second component 2; an annular groove 8 for accommodating the end of the spring is provided on both end surfaces of the floating member 5; in this embodiment, the elastic member works by compression, and the end of the basic elastic member 3 and the end of the additional elastic member 4 are both arranged in the annular groove 8 and abut against the floating member 5. In addition, when the elastic member is extended and works, the end of the elastic member needs to be stuck in the annular groove 8 and not separated; the first component 1 is also opened An annular groove 8 is provided. Specifically, the front end of the basic elastic member 3 is located in the annular groove 8 of the rear end surface of the first floating member 5a and abuts against the first floating member 5a. The rear end of the basic elastic member 3 is located in the annular groove 8 of the first component 1 and abuts against the first component 1. The rear end of the first additional elastic member 4a is located in the annular groove 8 of the front end surface of the first floating member 5a and abuts against the first floating member 5a. The front end of the first additional elastic member 4a is located in the annular groove 8 of the rear end surface of the second floating member 5b and abuts against the second floating member 5b. The rear end of the second additional elastic member 4b is located in the annular groove 8 of the front end surface of the first floating member 5a and abuts against the second floating member 5b. The front end surface of the second floating member 5b is in the annular groove 8 and abuts against the second floating member 5b, and the front end of the second additional elastic member 4b abuts against the second component 2; therefore, the basic elastic member 3, the first additional elastic member 4a, and the second additional elastic member 4b are coaxially arranged adjacent to each other, and can selectively realize the series connection of the springs; further, the two slots 22 are respectively located in front of the first floating member 5a and in front of the second floating member 5b, that is, the first blocking member 6a is located in front of the first floating member 5a, and the second blocking member 6b is located in front of the first floating member 5a.

[0040] A guide shaft 25 is provided between the first component 1 and the second component 2. The guide shaft 25 is arranged along the movement direction of the first component 1 and the second component 2, that is, along the front-to-back direction. The first floating component 5a and the second floating component 5b are both slidably mounted on the guide shaft 25. The basic elastic component 3, the first additional elastic component 4a, and the second additional elastic component 4b are all mounted outside the guide shaft 25. In addition, the outer surfaces of the first floating component 5a and the second floating component 5b also slide with the inner surface of the second component 2; the guide shaft 25 is inserted into the first component 1. When the first component 1 and the second component 2 move, the first component 1 slides on the guide shaft 25; the existence of the guide shaft 25 can increase the stability of the device during movement; further, the first component 1 is provided with a hollow extension shaft 12 extending forward from the center of its annular groove 8, and the extension shaft 12 is provided with a through socket 13. The guide shaft 25 is set in the socket 13. When the first component 1 moves close to the second component 2, the guide shaft 25 selectively extends out of the first component 1 through the socket 13.

[0041] like Figure 11 、 12 As shown, although the floating member 5 can roughly maintain a stable position under the action of the front and rear elastic members, there may still be deviations; therefore, a plurality of stepped portions 9 are provided at the end of the floating member 5 close to the blocking member 6, and the blocking member 6 abuts against any stepped portion 9 to block the floating member 5; when the blocking member 6 blocks the floating member 5, the position of the floating member 5 may have deviations. If there were no stepped portions 9, the blocking member 6 would not be able to block the floating member 5 when the position of the floating member 5 deviates. The stepped portions 9 can provide multiple compensations, so that when the floating member 5 has different deviations, the blocking member 6 can still abut against different stepped portions 9 to achieve blocking of the floating member 5. Part 5; at the same time, two elastic transmission members are rotatably provided on the second component 2, namely the first transmission member 16 and the second transmission member 17, which are respectively used to control the sliding of the first blocking member 6a and the second blocking member 6b; the transmission member is elastic and adapts to the step portion 9, which facilitates the blocking member 6 to be snapped into contact; the degree of protrusion of the step portion 9 toward the blocking member 6 is different, and the blocking member 6 may not be able to completely enter the second component 2 when it abuts the step portion 9, so it is necessary to have an elastic transmission member that can adapt to the protrusion of the step portion 9, so that the stroke of the transmission member controlling the sliding of the blocking member 6 is not fixed, so as to prevent interference when the blocking member 6 enters.

[0042] Since the number of additional elastic members 4 is more than two, there is a sequence requirement for switching the additional elastic members 4 between the working state and the static state in order to achieve changes between multiple elastic gears: a sliding control member 19 is provided on the second component 2, and the control member 19 is transmission-connected to the first transmission member 16 and the second transmission member 17, the first transmission member 16 is transmission-connected to the first blocking member 6a, and the second transmission member 17 is transmission-connected to the second blocking member 6b; when the control member 19 slides to switch the first floating member 5a and the second floating member 5b to static relative to the second component 2, the first blocking member 6a gives priority to blocking the second floating member 5b; when the control member 19 slides to switch the first floating member 5a and the second floating member 5b to move relative to the second component 2, the first blocking member 6a gives priority to avoiding the first floating member 5a; the more the number of additional elastic members 4, the more gears formed by the device, but when there are more than two additional elastic members 4, the order of switching the states of the floating member 5 needs to be additionally considered; in this solution, the basic elastic member 3, the first additional elastic member 4a, the second additional elastic member 4a, the first additional elastic member 4b and the second additional elastic member 4b are connected. The two additional elastic members 4b are arranged in this way. The basic elastic member 3 is always in the working state. Only when it is in the working state is it in the first gear, and the elastic force that can be provided by the first gear is the largest. Then, when the basic elastic member 3 and the second additional elastic member 4b adjacent to it are in the working state, it is the second gear. When all three are in the working state, it is the third gear. Therefore, the state switching order of the floating member 5 achieved by the control member 19, the first transmission member 16, and the second transmission member 17 should be that when the elastic force is gradually reduced, the first transmission member 16 is released first. The first floating member 5a is released, and then the second floating member 5b is released by the second transmission member 17. Conversely, when the elastic force is gradually increased, the second floating member 5b is first blocked by the second transmission member 17, and then the first floating member 5a is blocked by the first transmission member 16. In summary, when the elastic force is to be reduced, the order of releasing the floating members 5 should start from the base elastic member 3 and gradually unlock the floating members 5 farther away. When the elastic force is to be increased, the order of blocking the floating members 5 should start from the base elastic member 3 and gradually lock the floating members 5 closer.

[0043] In this example, the control member 19 is arranged on the lower surface of the second component 2 for sliding back and forth. A ridge 27 is provided on the lower surface of the second component 2 downwardly. The control member 19 is in the shape of a plate and has a corresponding long groove 24. The control member 19 is set on the second component 2 by screws and gaskets so that the ridge 27 is located in the long groove 24. When the control member 19 slides, the position of the ridge 27 in the long groove 24 changes. The control member 19 is respectively provided with a first control groove 20 and a second control groove 23. The first transmission member 16 is arranged in the first control groove 20, and the second transmission member 16 is arranged in the second control groove 24. The second transmission member 17 is arranged in the second control groove 23. The first control groove 20 and the second control groove 23 are configured to control the movement sequence of the first transmission member 16 and the second transmission member 17. Specifically, the first transmission member 16 and the second transmission member 17 are respectively rotatably arranged on the second component 2. The first control groove 20 has a first stationary section 201 with the same movement direction as the first component 1 and the second component 2, and a first action section 202 inclined relative to the first stationary section 201. Correspondingly, the second control groove 23 has a second stationary section 201. 31 and the second action section 232; the first static section 201 is close to the first component 1 relative to the first action end, and the second static section 231 is away from the first component 1 relative to the second action section 232; in this example, the first control groove 20 is located behind the second control groove 23, and the first static section 201 is arranged along the front-to-back direction and is located behind the first action section 202, and the first action section 202 is inclined inward from back to front; the second static section 231 is located in front of the second action section 232, and the second action section 232 is also inclined inward from back to front, and the first static section 201 and the second static section 231 have different positions in the left-right direction, and the second static section 231 is located on the inner side of the first static section 201 in the left-right direction, while the first action section 202 and the second action section 232 are almost the same; when the control member 19 slides, the transmission member located in the static section remains stationary, and the transmission member located in the action section will rotate, thereby controlling the corresponding blocking member 6 to slide; the preset motion sequence is achieved through structural design, that is, the sequence of controlling the floating member 5 is achieved, and the structure is simple and ingenious.

[0044] like Figure 3-14As shown, the control member 19 is connected to a pull wire 26, and the pull wire 26 is configured to drive the control member 19 to move; in this embodiment, the pull wire 26 also has three gears, corresponding to the first floating member 5a and the second floating member 5b being locked, the first floating member 5a being unlocked, the second floating member 5b being locked, and the first floating member 5a and the second floating member 5b being unlocked; to be more specific, the transmission member is a torsion spring, having two arms 18, one of which is inserted in the blocking member 6 to control the sliding of the blocking member 6, and the other arm 18 is inserted in the control groove to rotate in response to the sliding of the control member 19; when the control member 19 is at the front, the arms 18 of the first transmission member 16 and the second transmission member 17 are in the same position in the left and right directions, the arm 18 of the first transmission member 16 is located at the rear end of the first stationary section 201, and the arm 18 of the second transmission member 17 is located at the rear end of the second action section 232. At this time, 2 and 3. When the pull wire 26 is in the first position, the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6a and the second stopper 6b are in the second position, and the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6a and the second stopper 6b are in the first position, and the first stopper 6b and the second stopper 6b are in the second position, and the first stopper 6b and the second stopper 6b are in the second position, and the first stopper 6b and the second stopper 6b are in the first position, and the first stopper 6b and the second stopper 6b are in the second position, and the first stopper 6b and the second stopper 6b are in the second position, and the first stopper 6b and the second stopper 6b are in the second position, and the first stopper 6b and the second stopper 6b are in the second position, and the second ... Located inside the second component 2 and blocking the second floating member 5b, the first blocking member 6a still does not block the first floating member 5a. At this time, the second additional elastic member 4b switches to a stationary state, and only the basic elastic member 3 and the first additional elastic member 4a are connected in series. The elastic force increases, and this is the second gear position of the pull wire 24. When the pull wire 24 drives the control member 19 to slide further backward, the support arm 18 of the first transmission member 16 moves in the first action section 202, causing the first transmission member 16 to rotate and drive the first blocking member 6a to slide inward, while the support arm 18 of the second transmission member 17 moves in the second stationary section 211, keeping the second blocking member 6b blocking the second floating member 5b.When the control member 19 slides to its rearmost end, the arm 18 of the first transmission member 16 is at the front end of the first active section 202, and the arm 18 of the second transmission member 17 is at the front end of the second stationary section 211. Both the first and second blocking members 6a and 6b are located within the second component 2. The first blocking member 6a blocks the first floating member 5a, causing the first additional elastic member 4a to also switch to a stationary state. Only the basic elastic member 3 is in an active state, with maximum elastic force. This is the third gear position of the cable 24.

[0045] Even if there are more additional elastic members 4, the working state and the static state of each additional elastic member 4 can be switched in sequence through the adaptive design of the control slot. For example, the control slots of the front and rear gears are only two-stage, namely the action stage and the static stage, while the control slots of the middle gears are three-stage, namely static, action and static again. The only difference is the position of the action stage, and the control sequence can be determined according to the position of the action stage.

Claims

1. A method for quickly adjusting the elastic force of a chair backrest, characterized by: A linear motion device providing elastic force is arranged in a front-to-back or up-to-down direction, so that one end of the linear motion device is linked to the chair back, and the linear motion device can move and provide elastic force in response to the backward tilting movement of the chair back; one end of the linear motion device linked to the chair back is a linkage end, and when the chair back rotates to tilt backward, the force is transmitted from the linkage end to the other end; at least two elastic members are arranged in the same direction in the linear motion device, and a floating member is provided between each two elastic members, so that the floating member elastically abuts against the elastic members on both sides; a controllable blocking member is provided next to each floating member, and the blocking member is controlled to switch between a blocking position and an avoidance position by controlling the movement of the blocking member to block or avoid the floating member; when the elastic force of the chair back tilting is increased, the blocking member is switched to the blocking position, so that the floating member is stationary, and only the elastic member between the linkage end and the floating member provides elastic force in response to the force of the chair back tilting backward; when the elastic force of the chair back tilting is reduced, the blocking member is switched to the avoidance position, so that the floating member slides, and the elastic members on both sides of the floating member can provide elastic force in response to the force of the chair back tilting backward.

2. The method for quickly adjusting the seat back tilt elastic force according to claim 1, characterized in that: The elastic members in the linear motion device are coaxially and selectively arranged in series, and the number of elastic members in series is changed according to whether the floating member is in a stationary or sliding state; when the floating member is switched to a stationary state, the number of elastic members in series is reduced and the elastic force is increased; when the floating member is switched to a sliding state, the number of elastic members in series is increased and the elastic force is reduced.

3. The method for quickly adjusting the seat back reclining force according to claim 1, characterized in that: The elastic member located between the floating member closest to the linkage end and the linkage end can always expand and contract in response to the rotation of the chair back.

4. The method for quickly adjusting the seat back tilt elastic force according to claim 1, characterized in that: When the blocking member is located at the avoidance position, the floating member is floated in the linear motion device under the action of the elastic members on both sides.

5. The method for quickly adjusting the seat back tilt elastic force according to claim 4, characterized in that: A plurality of stepped portions are provided on the floating member, so that the distance between the end surface of each stepped portion and the blocking member is different, and the distance between the stepped portion closer to the blocking position and the blocking member is larger.

6. The method for quickly adjusting the seat back reclining elastic force according to claim 1, characterized in that: When there are multiple floating parts, the order of blocking the floating parts to increase the seat back tilting elastic force is starting from the floating part farthest from the linkage end; when there are multiple floating parts, the order of releasing the floating parts to reduce the seat back tilting elastic force is starting from the floating part closest to the linkage end.

7. The method for quickly adjusting the seat back reclining elastic force according to claim 6, characterized in that: Each floating member is connected to a corresponding transmission member, and all the transmission members are connected to a control member, so that each transmission member moves in an orderly manner in response to the movement of the control member and drives the floating member to slide in an orderly manner.

8. The method for quickly adjusting the seat back reclining elastic force according to claim 7, characterized in that: Each transmission member is connected to a corresponding control slot, and each control slot is arranged on the control member at intervals along the direction of movement of the control member; the control slot has a static section and an active section, so that the extension direction of the static section is the same as the direction of movement of the control member, and the active section is tilted relative to the static section; when the control member moves, the transmission member remains static if it is in the static section, and moves if it is in the active section.

9. The method for quickly adjusting the seat back reclining elastic force according to claim 7, characterized in that: All transmission parts are rotatably arranged on the second part of the linear motion device, and the control part is slidably arranged on the second part, so that the sliding direction of the control part is the same as the moving direction of the linear motion device.

10. The method for quickly adjusting the seat back reclining elastic force according to claim 6, characterized in that: Use cables to drive the movement of the control element.

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