Elastic force adjusting device and seat

Abstract

The elastic force adjusting device comprises a first component, a second component, a basic elastic force piece and at least one additional elastic force piece, the elastic force pieces are arranged in the same direction, and a sliding block is arranged between the basic elastic force piece and the additional elastic force piece; when the first component and the second component move relatively, the sliding block can be selectively static or move, so that the basic elastic piece deforms independently or together with the additional elastic piece, and elastic force adjustment is achieved. The elastic force is changed by controlling the state of the sliding block and utilizing whether the elastic pieces are connected in series or not, adjustment is easy and fast, and modular design is high in adaptability; when applied to a seat, the device is arranged between a seat part and a bottom shell, a first part is connected with the seat part, and a second part is connected with the bottom shell; the chair back tilts to drive the seat part to slide, the device provides buffering and resetting elastic force and can be quickly adjusted according to the weight of a user to adapt to different seats, and the use experience is improved.

Description

Technical Field

[0001] The present invention relates to the field of furniture, and in particular to an elastic force adjustment device and a seat. Background Art

[0002] With the improvement of living standards, people's requirements for furniture are gradually increasing. The mobility of modern furniture is valued, and the adjustment scheme of movable parts is the key point that many manufacturers focus on in design. There is inevitably a part that requires elastic adjustment. Mastering more effective and reasonable elastic adjustment technology will also help us to control a larger market accordingly.

[0003] Taking seats as an example, in existing seats, seat back reclining has almost become a necessary function and one of the core elements to improve user comfort; and the elastic adjustment performance during the reclining process directly affects the operating experience and safety feeling 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.

[0004] In addition to providing cushioning elastic force when the chair back is tilted back and auxiliary reset elastic force when the chair 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. However, in the existing technology, most seats use a spring structure with fixed elastic force, or mostly rely on a knob-type mechanical adjustment structure, and the spring preload is changed by manually rotating the knob. The adjustment requires multiple rotations, which takes a long time, and the adjustment accuracy is low, and it cannot quickly match the user's weight requirements. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides an elastic force adjustment device, including a first component, a second component, a basic elastic member and at least one additional elastic member. The elastic members are arranged in the same direction with a slider between the two. When the first and second components move relative to each other, the slider can selectively be stationary or move, so that the basic elastic member deforms alone or together with the additional elastic member to achieve elastic force adjustment. It changes the elastic force by controlling the state of the slider and whether the elastic members are connected in series. The adjustment is simple and quick, and the modular design has strong adaptability.

[0006] A chair is further provided, in which a device is arranged between the seat and the bottom shell, the first component is connected to the seat, and the second component is connected to the bottom shell; the tilting of the chair back drives the seat to slide, and the device provides buffering and reset elasticity, which can be quickly adjusted according to the user's weight, adapting to different seats to enhance the user experience.

[0007] The technical solution of the present invention is achieved as follows: A spring adjustment device includes a first component, a second component, a basic spring piece and at least one additional spring piece, the basic spring piece and the additional spring piece are arranged in the same direction, and the first component and the second component are arranged to move relative to each other; a slider is provided between the basic spring piece and the additional spring piece, the basic spring piece is located between the first component and the slider, and the additional spring piece is located between the slider and the second component, and the slider is configured to selectively move or remain stationary relative to the second component; when the slider and the second component are relatively stationary, only the basic spring piece is deformed in response to the movement of the first component and the second component; when the slider and the second component move relative to each other, both the basic spring piece and the additional spring piece can be deformed in response to the movement of the first component and the second component.

[0008] First, the basic elastic member 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 can switch between a working state and a static state under the action of the slider, that is, when the slider and the second component move relative to each other, the two elastic members are in a linkage state, and the additional elastic member can be deformed together with the basic elastic member, and at this time, the elastic force that the device can provide is smaller; when the slider and the second component are relatively stationary, the additional elastic member and the basic elastic member are separated by the slider, the additional elastic member is stationary and no longer provides elastic force, and the elastic force is only provided by the basic elastic member, and at this time, the elastic force provided by the basic elastic member is greater.

[0009] In addition, in this solution, the elastic force adjustment device is modularized so that the first component and the second component are respectively connected to the movable component and the fixed component that need to be adjusted of the furniture, providing elastic force when the movable component moves, and can perform rapid elastic force adjustment, with better functional adaptability.

[0010] 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 between the first part and the second part) and the elastic coefficient are the same, the elastic force provided by only the basic elastic part will be twice that when the basic elastic part and the additional elastic part 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 can be selected according to actual conditions. When only the basic elastic part 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 is in a series state is determined by whether the slider moves. When adjusting, you only need to control the state of the slider, so that the elastic force adjustment is simple and quick.

[0011] 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 and the second component 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.

[0012] When the elastic member works, it can be compressed or extended.

[0013] As preferably, basic elastic member and additional elastic member are springs.Except common telescopic spring, curved spring plate can also be used as elastic member.

[0014] Preferably, annular grooves are provided on both end surfaces of the slider for accommodating the ends of the springs. When the elastic member is compressed and in operation, the ends of the basic elastic member and the ends of the additional elastic member are both disposed in the annular grooves and abut against the slider. When the elastic member is extended and in operation, the ends of the elastic member must remain retained in the annular grooves and prevent them from disengaging.

[0015] Preferably, the basic elastic member and the additional elastic member are coaxially arranged. Coaxial arrangement is a series arrangement method that saves volume.

[0016] Preferably, a blocking member is provided on the side of the slider along the direction of movement of the first and second components. When the blocking member slides between the slider and the second component, the blocking member blocks the slider, causing the slider and the second component to remain stationary relative to each other. When the blocking member slides away from the slider and the second component, the blocking member releases the slider, causing the slider to move relative to the second component. Controlling the movement and stationary state of the slider using the blocking member is simple and quick to operate. When the slider moves, the series connection of the additional elastic member and the basic elastic member takes effect. When the slider is stationary, the series connection of the additional elastic member and the basic elastic member fails, and the additional elastic member ceases to function.

[0017] Preferably, the second component is a sleeve, and the slider, additional elastic member, and blocking member are all disposed within the sleeve. The slider and additional elastic member are arranged axially along the sleeve, and the blocking member is arranged to slide radially along the sleeve. The sleeve has a housing function, allowing the additional elastic member, slider, blocking member, etc. to be stably installed.

[0018] Preferably, the sleeve is provided with a slot, which is arranged radially along the sleeve and extends into the interior of the sleeve, wherein the blocking member is slidably disposed in the slot; the end of the slider is located beside the slot. The blocking member enters or exits the interior of the sleeve through the slot to block or avoid the slider.

[0019] Preferably, the blocking member is provided with an escape groove for evading the additional elastic member. The existence of the escape groove can prevent the blocking member from affecting the elastic member, and the blocking member may be U-shaped.

[0020] Preferably, the end of the slider near the blocking member is provided with a plurality of stepped portions, and the blocking member abuts against any of the stepped portions to block the slider. When the blocking member blocks the slider, the position of the slider may deviate. Without the stepped portions, the blocking member would be unable to block the slider if the slider deviates. The stepped portions provide multiple compensations, so that even when the slider has different deviations, the blocking member can still abut against different stepped portions to block the slider.

[0021] Preferably, the second component is provided with a resilient transmission member configured to control the sliding movement of the blocking member. The transmission member is resilient and adapts to the stepped portion, facilitating the blocking member's engagement. The stepped portion may protrude to varying degrees toward the blocking member, and the blocking member may not fully enter the second component when abutting the stepped portion. Therefore, the resilient transmission member is required to adapt to the protrusion of the stepped portion, so that the travel of the transmission member controlling the sliding movement of the blocking member is not fixed, thereby preventing interference when the blocking member enters.

[0022] Preferably, there are two additional elastic members, namely a first additional elastic member and a second additional elastic member, the second additional elastic member is closer to the second component than the first additional elastic member; the slider between the basic elastic member and the first additional elastic member is the first slider, and a second slider is provided between the first additional elastic member and the second additional elastic member, a first sliding block is provided next to the first slider, and a second sliding block is provided next to the second slider, the first block is located between the first slider and the second slider, and the second block is located between the second slider and the second component; a sliding control member is provided on the second component, and the control member is transmission-connected with the first transmission member and the second transmission member, the first transmission member is transmission-connected with the first block, and the second transmission member is transmission-connected with the second block; when the control member slides to switch the first slider and the second slider to stationary relative to the second component, the first block gives priority to blocking the second slider; when the control member slides to switch the first slider and the second slider to move relative to the second component, the first block gives priority to avoiding the first slider. The more the number of additional elastic members, the more gears formed by the device. However, when there are more than two additional elastic members, the order of switching the slider states needs to be considered. In this solution, the basic elastic member, the first additional elastic member, and the second additional elastic member are arranged in this order. The basic elastic member is always in a working state. Only when it is in a 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 and the second additional elastic member adjacent to it are in a working state, it is the second gear. When all three are in a working state, it is the third gear. Therefore, by controlling The state switching order of the sliders realized by the first transmission member, the second transmission member and the second transmission member should be as follows: when the elastic force is gradually reduced, the first transmission member releases the first slider first, and then the second transmission member releases the second slider; conversely, when the elastic force is gradually increased, the second transmission member blocks the second slider first, and then the first transmission member blocks the first slider; in summary, when the elastic force is to be reduced, the order of releasing the sliders should start from the base elastic member and gradually unlock the sliders farther away; when the elastic force is to be increased, the order of blocking the sliders should start from the base elastic member and gradually lock the sliders closer.

[0023] Preferably, a first control groove and a second control groove are respectively provided on the control member, the first transmission member is arranged in the first control groove, and the second transmission member is arranged in the second control groove, and the first control groove and the second control groove are configured to control the movement sequence of the first transmission member and the second transmission member.

[0024] Preferably, the first and second transmission members are rotatably mounted on the second component. The first control slot has a first stationary segment aligned with the movement direction of the first and second components, and a first active segment inclined relative to the first stationary segment. Correspondingly, the second control slot has a second stationary segment and a second active segment. The first stationary segment is closer to the first component relative to the first active end, while the second stationary segment is farther away from the first component relative to the second active segment. This structural design achieves a predetermined motion sequence, thereby achieving a controlled sequence for the slider. The structure is simple and ingenious.

[0025] Preferably, the control member is connected to a pull wire configured to drive the control member to move; an elastic return member is further provided between the control member and the second member, the elastic return member configured to impart an elastic return force to the control member in a direction opposite to the direction in which the pull wire drives the control member to move. In this embodiment, the pull wire also has three gears, corresponding to locking both the first and second sliders, unlocking the first slider, locking the second slider, and unlocking both the first and second sliders.

[0026] Preferably, a guide shaft is provided between the first and second components, the guide shaft being arranged along the direction of movement of the first and second components, and a slider being slidably disposed on the guide shaft; the guide shaft is inserted into the first component, and when the first and second components move, the first component slides on the guide shaft. The presence of the guide shaft can increase the stability of the device during movement. The first component is provided with a through socket, and the guide shaft is disposed in the socket. When the first component moves toward the second component, the guide shaft selectively extends out of the first component.

[0027] A chair comprises a backrest, a seat, a bottom shell and the elastic adjustment device as described above, wherein the backrest is rotatably arranged on the bottom shell, the seat is slidably arranged on the bottom shell and is linked to the backrest, and the elastic adjustment device is arranged between the seat and the bottom shell in the front-to-back direction; the first component is connected to the seat, and the second component is connected to the bottom shell; when the backrest tilts backward, the seat slides forward on the bottom shell and causes the first component to move closer to the second component.

[0028] The device is applied to a seat to provide a buffering elastic force when the chair back tilts backward, and to provide an auxiliary restoring force when the chair back rotates forward to restore the upright position. 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 tilts backward, the seat moves forward and the elastic member is compressed to provide elastic force. When the chair back restores to an upright position, although the elastic member extends, it also assists the seat to move backward and the chair back to restore to an upright position by compressing the stored elastic force.

[0029] Preferably, a circular shaft is provided on the bottom shell, a circular groove is provided at the front end of the second component, and the circular shaft abuts against the circular groove. The device can adapt to rotation while performing telescopic movement to prevent interference.

[0030] Preferably, an elastic force regulating device is provided on the left and right sides of the seat and the bottom shell. If there is only one elastic force regulating device, it can be provided in the middle. Elastic force regulating devices are provided on both the left and right sides to maintain uniform and stable force.

[0031] Preferably, the left and right ends of the bottom shell have upwardly extending protrusions, and the seat back is rotatably connected to the protrusions; the seat portion has an upwardly extending extension, and the seat back is rotatably connected to the extension.

[0032] The design starting point, concept and beneficial effects of the present invention using the above technical solution are: First, the basic elastic member 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 can switch between a working state and a static state under the action of the slider, that is, when the slider and the second component move relative to each other, the two elastic members are in a linkage state, and the additional elastic member can be deformed together with the basic elastic member, and at this time, the elastic force that the device can provide is smaller; when the slider and the second component are relatively stationary, the additional elastic member and the basic elastic member are separated by the slider, the additional elastic member is stationary and no longer provides elastic force, and the elastic force is only provided by the basic elastic member, and at this time, the elastic force provided by the basic elastic member is greater.

[0033] In addition, in this solution, the elastic force adjustment device is modularized so that the first component and the second component are respectively connected to the movable component and the fixed component that need to be adjusted of the furniture, providing elastic force when the movable component moves, and can perform rapid elastic force adjustment, with better functional adaptability.

[0034] 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 between the first part and the second part) and the elastic coefficient are the same, the elastic force provided by only the basic elastic part will be twice that when the basic elastic part and the additional elastic part 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 can be selected according to actual conditions. When only the basic elastic part 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 is in a series state is determined by whether the slider moves. When adjusting, you only need to control the state of the slider, so that the elastic force adjustment is simple and quick.

[0035] 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 and the second component 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the three-dimensional structure of a seat using an elastic adjustment device in an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of a seat using an elastic adjustment device in an embodiment of the present invention Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the elastic force adjustment device disposed between the seat and the bottom shell in an embodiment of the present invention; Figure 4 This 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 slider 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 the sliders are all blocked by the blocking members in the 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 This is a schematic diagram of the three-dimensional structure in which the control member and the blocking member are connected via a transmission member in an embodiment of the present invention.

[0037] The reference numerals of the drawings are as follows: elastic force adjustment 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; slider 5; first slider 5a; second slider 5b; annular groove 8; stepped portion 9; blocking member 6; first blocking member 6a; second blocking member 6b; avoidance groove 15; first transmission member 16; second transmission member Movable 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; elastic return member 28; 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

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The specific implementation of the present invention is as follows: like Figure 3 、 4 As shown in Figures 14 and 15, the present invention provides an elastic force adjustment device 100, comprising 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 arranged to move relative to each other; a slider 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 slider 5, and the additional elastic member 4 is located between the slider 5 and the second component 2, and the slider 5 is configured to selectively move or remain stationary relative to the second component 2; when the slider 5 and the second component 2 are relatively stationary, only the basic elastic member 3 is deformed in response to the movement of the first component 1 and the second component 2; when the slider 5 and the second component 2 are relatively moving, both the basic elastic member 3 and the additional elastic member 4 can be deformed in response to the movement of the first component 1 and the second component 2.

[0042] 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 slider 5, that is, when the slider 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 slider 5 and the second component 2 are relatively stationary, the additional elastic member 4 and the basic elastic member 3 are separated by the slider 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.

[0043] In addition, in this solution, the elastic force adjustment 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 of the furniture, providing elastic force when the movable component moves, and being able to perform rapid elastic force adjustment, with better functional adaptability.

[0044] In this solution, the magnitude of the elastic force is not determined by the superposition of the elastic members, but by whether the elastic members are in a series state. The elastic force provided by the elastic members 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 member 3 will be twice that when the basic elastic member 3 and the additional elastic member 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 members 4 can be selected according to actual conditions. When only the basic elastic member 3 is working, it is the largest elastic force gear. When two elastic members are working in series, it is the second largest elastic force gear. When three elastic members are working in series, it is the third largest elastic force gear, and so on. Whether the additional elastic member 4 is in a series state is determined by whether the slider 5 moves. When adjusting, it is only necessary to control the state of the slider 5, making the elastic force adjustment simple and quick.

[0045] 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.

[0046] 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 elastic adjustment 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 elastic adjustment 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 moves the first component 1 close to the second component 2.

[0047] 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.

[0048] 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 elastic adjustment 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.

[0049] 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 provided at the front of the bottom shell 400 and is arranged along the left and right directions. The circular shaft 402 abuts against the circular groove 21. While the device is telescoping, it is given adaptive rotation to prevent interference; an elastic adjustment device 100 is provided on each of the left and right sides of the seat 300 and the bottom shell 400; if there is only one elastic adjustment device 100, it can be set in the middle. In this embodiment, elastic adjustment devices 100 are provided on both the left and right sides to maintain uniform and stable force.

[0050] 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 sliders 5, namely the first slider 5a and the second slider 5b. The sliders 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 sliders 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 slider 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, slider 5, blocking member 6, etc. can be stably installed; the blocking member is perpendicular to the sliding direction of the slider.

[0051] The second component 2 is provided with two slots 22 spaced apart from each other 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 the interior of the second component 2. The blocking member 6 is slidably arranged in the slots 22. The end of the slider 5 is located beside the slots 22. The blocking member 6 is arranged beside the slider 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 slider 5. When the blocking member 6 slides between the slider 5 and the second component 2, the blocking member 6 blocks the slider 5, and the slider 5 and the second component 2 are relatively stationary. When the member 6 slides to leave between the slider 5 and the second member 2, the blocking member 6 releases the slider 5, and the slider 5 moves relative to the second member 2; the movement and stillness of the slider 5 are controlled by the blocking member 6, and the operation is simple and fast; when the slider 5 moves, the series connection of the additional elastic member 4 and the basic elastic member 3 takes effect, and when the slider 5 is stationary, the series connection of the additional elastic member 4 and the basic elastic member 3 fails, and the additional elastic member 4 no longer works; an avoidance groove 15 for avoiding the additional elastic member 4 is provided on the blocking member 6; the existence of the avoidance groove 15 can prevent the blocking member 6 from affecting the elastic member, and the shape of the blocking member 6 can be U-shaped.

[0052] 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 that saves volume; the second additional elastic member 4b is closer to the second component 2 than the first additional elastic member 4a; the slider 5 between the basic elastic member 3 and the first additional elastic member 4a is the first slider 5a, and the slider 5 between the first additional elastic member 4a and the second additional elastic member 4b is the second slider 5b. The first slider 5a is provided with the first blocking member 6a, and the second slider 5b is provided with the second blocking member 6b, the first blocking member 6a is located between the first slider 5a and the second slider 5b, and the second blocking member 6b is located between the second slider 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 slider 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 slider 5. In addition, when the elastic member is extended and works, the end of the elastic member needs to be clamped 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 slider 5a and abuts against the first slider 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 slider 5a and abuts against the first slider 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 slider 5b and abuts against the second slider 5b. The rear end of the second additional elastic member 4b is located in the annular groove 8 of the rear end surface of the first slider 5b and abuts against the second slider 5b. The front end faces of the second sliders 5b are in the annular groove 8 and abut against the second slider 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 end to end, and can selectively realize the series connection of the springs; further, the two slots 22 are respectively located in front of the first slider 5a and in front of the second slider 5b, that is, the first blocking member 6a is located in front of the first slider 5a, and the second blocking member 6b is located in front of the first slider 5a.

[0053] 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 slider 5a and the second slider 5b are both slidably mounted on the guide shaft 25. The basic elastic member 3, the first additional elastic member 4a, and the second additional elastic member 4b are all mounted outside the guide shaft 25. In addition, the outer surfaces of the first slider 5a and the second slider 5b are also slidably matched 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 presence 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.

[0054] like Figure 11 、 12 As shown, although the slider 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 slider 5 close to the blocking member 6, and the blocking member 6 abuts against any stepped portion 9 to block the slider 5; when the blocking member 6 blocks the slider 5, the position of the slider 5 may have deviations. If there were no stepped portion 9, the blocking member 6 would not be able to block the slider 5 when the position of the slider 5 deviates. The stepped portion 9 can provide multiple compensations, so that when the slider 5 has different deviations, the blocking member 6 can still abut against different stepped portions 9 to block the slider 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.

[0055] 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 slider 5a and the second slider 5b to be stationary relative to the second component 2, the first blocking member 6a gives priority to blocking the second slider 5b; when the control member 19 slides to switch the first slider 5a and the second slider 5b to be moving relative to the second component 2, the first blocking member 6a gives priority to avoiding the first slider 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 sliders 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 4b is arranged in this way, and 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 first gear can provide the largest elastic force. Then, when the basic elastic member 3 and the second additional elastic member 4b adjacent to it are in the working state, it is in the second gear, and when all three are in the working state, it is the third gear. Therefore, the state switching sequence of the slider 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 releases the first slider 5a first, and then the second transmission member 17 releases the second slider 5b. Conversely, when the elastic force is gradually increased, the second transmission member 17 blocks the second slider 5b first, and then the first transmission member 16 blocks the first slider 5a. In summary, when the elastic force is to be reduced, the order of releasing the sliders 5 should start from approaching the basic elastic member 3 and gradually unlocking the sliders 5 farther away. When the elastic force is to be increased, the order of blocking the sliders 5 should start from moving away from the basic elastic member 3 and gradually locking the sliders 5 closer.

[0056] In this example, the control member 19 is arranged on the lower surface of the second component 2 for sliding back and forth, and a ridge 27 is protruding downward from the lower surface of the second component 2. The control member 19 is in the shape of a plate, and a corresponding long groove 24 is opened on it. 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; a first control groove 20 and a second control groove 23 are respectively provided on the control member 19, the first transmission member 16 is arranged in the first control groove 20, and 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 231 and the second acting section 232; the first stationary section 201 is close to the first component 1 relative to the first acting end, and the second stationary section 231 is away from the first component 1 relative to the second acting section 232; in this example, the first control groove 20 is located behind the second control groove 23, the first stationary section 201 is arranged in the front-to-back direction and is located behind the first acting section 202, and the first acting section 202 is inclined inward from back to front; the second stationary section 231 is located in front of the second acting section 232, and the second acting section 232 is also inclined inward from back to front, and the first stationary section 201 and the second stationary section 231 are different in position in the left-right direction, the second stationary section 231 is located on the inner side of the first stationary section 201 in the left-right direction, and the first acting section 202 and the second acting section 232 are almost the same; when the control member 19 slides, the transmission member located in the stationary section remains stationary, and the transmission member located in the acting section will rotate, thereby controlling the corresponding blocking member 6 to slide; the preset movement sequence is achieved through structural design, that is, the sequence of controlling the slider 5 is achieved, and the structure is simple and ingenious.

[0057] like Figure 3-14 As shown in Figures 1 and 2, the control member 19 is connected to a pull wire 26, which is configured to drive the control member 19 to move; an elastic reset member 28 is also provided between the control member 19 and the second member 2, and the elastic reset member 28 is configured to give the control member an elastic reset force that is opposite to the direction in which the pull wire drives the control member to move. The elastic reset member 28 in this embodiment is a tension spring; in this solution, the pull wire 26 also has three gears, which correspond to the first slider 5a and the second slider 5b being locked, the first slider 5a being unlocked, the second slider 5b being locked, and the first slider 5a and the second slider 5b being unlocked.

[0058] More specifically, 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 is inserted in the control slot to respond to the sliding of the control member 19 and generate rotation; 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 at 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, the first blocking member 6a and the second blocking member 6b do not block the first slider 5a and the second slider 5b, and the first additional elastic member 4a and the second additional elastic member 4b are both in working condition. , the three elastic members are connected in series, the elastic force is the smallest, and this is the first gear of the pull wire 26; when the pull wire 26 drives the control member 19 to slide backward, the arm 18 of the first transmission member 16 moves in the first static section 201, the first transmission member 16 remains stationary, the arm 18 of the second transmission member 17 moves in the second action section 232 and the second transmission member 17 rotates due to the tilt, and the second transmission member 17 pushes the second blocking member 6b inward; when the arm 18 of the first transmission member 16 is located at the front end of the first static section 201 and the rear end of the first action section 202, and the arm 18 of the second transmission member 17 is located at the front end of the second action section 232 and the rear end of the second static section 231, the second blocking member 6b is located at the second component 2 20, and the second blocking member 6a is moved inwards, while the first blocking member 6a is moved inwards, and the second blocking member 6b is kept blocking the second slider 5b. When the control member 19 slides to the rearmost end, the arm 18 of the first transmission member 16 is at the front end of the first action section 202, and the arm 18 of the second transmission member 17 is at the front end of the second static section 211, the first blocking member 6a and the second blocking member 6b are both located in the second component 2 Inside, the first blocking member 6a blocks the first slider 5a, so that the first additional elastic member 4a is also switched to the static state. Only the basic elastic member 3 is in the working state with the maximum elastic force. This is the third gear of the pull wire 24.

[0059] Another advantage of using a torsion spring as the transmission member is that it can achieve delayed locking. When the slider 5 is affected by the elastic members on both sides, causing its position in the second component 2 to block the slot 22, the blocking member 6 cannot enter the second component 2, and the support arm 18 connected to it cannot move. However, the control member 19 can still drive the support arm 18 in the control groove to move, causing the transmission member to accumulate elastic force. When the slider 5 slides to no longer block the slot 22, the transmission member releases the elastic force to drive the blocking member 6 to enter the second component 2 and block the slider 5.

[0060] 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 spring force adjustment device, characterized in that: The invention comprises a first component, a second component, a basic elastic component and at least one additional elastic component, the basic elastic component and the additional elastic component are arranged in the same direction, and the first component and the second component are arranged to move relative to each other; a slider is provided between the basic elastic component and the additional elastic component, the basic elastic component is located between the first component and the slider, and the additional elastic component is located between the slider and the second component, and the slider is configured to selectively move or remain stationary relative to the second component; when the slider and the second component are relatively stationary, only the basic elastic component extends and retracts in response to the movement of the first component and the second component; when the slider and the second component move relative to each other, both the basic elastic component and the additional elastic component can extend and retract in response to the movement of the first component and the second component.

2. The elastic force adjustment device according to claim 1, characterized in that: The basic elastic member and the additional elastic member are both springs.

3. The elastic force adjustment device according to claim 2, characterized in that: Both end surfaces of the slider are provided with annular grooves for accommodating the ends of the springs.

4. The elastic force adjustment device according to claim 1 or 2, characterized in that: The basic elastic member and the additional elastic member are coaxially arranged.

5. The elastic force adjustment device according to claim 1, characterized in that: Along the movement direction of the first component and the second component, a slidable blocking member is provided on the side of the slider. When the blocking member slides between the slider and the second component, the blocking member blocks the slider, and the slider and the second component are relatively stationary; when the blocking member slides to leave between the slider and the second component, the blocking member releases the slider, and the slider moves relative to the second component.

6. The elastic force adjustment device according to claim 5, characterized in that: The second component is a sleeve, and the slider, additional elastic member and blocking member are all arranged in the sleeve. The slider and the additional elastic member are arranged along the axial direction of the sleeve, and the blocking member is arranged to slide along the radial direction of the sleeve.

7. The elastic force adjustment device according to claim 6, characterized in that: A slot is provided on the sleeve, the slot is arranged along the radial direction of the sleeve and penetrates into the interior of the sleeve, the blocking member is slidably arranged in the slot; the end of the slider is located beside the slot.

8. The elastic force adjustment device according to claim 5, characterized in that: The blocking member is provided with an avoidance groove for avoiding the additional elastic member.

9. The elastic force adjustment device according to claim 5, characterized in that: The end of the sliding block close to the blocking member is provided with a plurality of stepped portions, and the blocking member abuts against any stepped portion to block the sliding block.

10. The elastic force adjustment device according to claim 9, characterized in that: The second component is provided with an elastic transmission member, which is configured to control the sliding of the blocking member.

11. The elastic force adjustment device according to claim 1, characterized in that: There are two additional elastic parts, namely the first additional elastic part and the second additional elastic part, the second additional elastic part is closer to the second part than the first additional elastic part; the slider between the basic elastic part and the first additional elastic part is the first slider, and a second slider is provided between the first additional elastic part and the second additional elastic part, a first sliding block is provided next to the first slider, and a second sliding block is provided next to the second slider, the first block is located between the first slider and the second slider, and the second block is located between the second slider and the second part; a sliding control part is provided on the second part, and the control part is transmission-connected with the first transmission part and the second transmission part, the first transmission part is transmission-connected with the first block, and the second transmission part is transmission-connected with the second block; when the control part slides to switch the first slider and the second slider to stationary relative to the second part, the first block gives priority to blocking the second slider; when the control part slides to switch the first slider and the second slider to move relative to the second part, the first block gives priority to avoiding the first slider.

12. The elastic force adjustment device according to claim 11, characterized in that: The control member is provided with a first control groove and a second control groove respectively. The first transmission member is arranged in the first control groove, and the second transmission member is arranged in the second control groove. The first control groove and the second control groove are configured to control the movement sequence of the first transmission member and the second transmission member.

13. The elastic force adjustment device according to claim 12, characterized in that: The first transmission member and the second transmission member are respectively rotatably arranged on the second member; the first control groove has a first stationary section with the same movement direction as the first member and the second member and a first action section inclined relative to the first stationary section. Correspondingly, the second control groove has a second stationary section and a second action section; the first stationary section is close to the first member relative to the first action end, and the second stationary section is away from the first member relative to the second action section.

14. The elastic force adjustment device according to claim 13, characterized in that: The control member is connected to a pull wire configured to drive the control member to move; an elastic reset member is also provided between the control member and the second member, and the elastic reset member is configured to give the control member an elastic reset force opposite to the direction of the pull wire driving the control member to move.

15. The elastic force adjustment device according to claim 1, characterized in that: A guide shaft is provided between the first component and the second component, the guide shaft is arranged along the movement direction of the first component and the second component, and the slider is slidably arranged on the guide shaft; the guide shaft is inserted into the first component, and when the first component and the second component move, the first component slides on the guide shaft.

16. A chair, characterized in that: It includes a chair back, a seat, a bottom shell and an elastic adjustment device as described in any one of claims 1 to 15, the chair back is rotatably arranged on the bottom shell, the seat is slidably arranged on the bottom shell and is linked with the chair back, and the elastic adjustment device is arranged between the seat and the bottom shell along the front-to-back direction; the first component is connected to the seat, and the second component is connected to the bottom shell; when the chair back is tilted backward, the seat slides forward on the bottom shell and causes the first component to move close to the second component.

17. The seat according to claim 16, characterized in that: A circular shaft is provided on the bottom shell, a circular groove is provided at the front end of the second component, and the circular shaft abuts against the circular groove.

18. The seat according to claim 16, characterized in that: An elastic force adjustment device is respectively provided on the left and right sides of the seat and the bottom shell.

19. The seat according to claim 16, characterized in that: The left and right ends of the bottom shell are provided with convex seats extending upward, and the chair back is rotatably connected to the convex seats; the seat part is provided with an extension part extending upward, and the chair back is rotatably connected to the extension part.

Images