Chair with multiple adjustable usage states

Abstract

A chair with multiple adjustable usage states. The chair is provided with two adjustable chair backrests (11, 12) and two adjustable armrests (21, 22), wherein the first chair backrest (11) is adjustable in height; an included angle between the second chair backrest (12) and a seat surface of a chair seat (3) is adjustable, such that the second chair backrest has multiple functions such as a chair backrest or a workbench; and the two armrests (21, 22) can be individually adjusted to enable inner side faces of the armrests (21, 22) to be at several adjustment angles, ranging from an acute angle to a reflex angle, with respect to the seat surface of the chair seat (3), such that a user can adjust the armrests (21, 22) according to preferences and sits upright, lies sideways, sits sideways and sits backwards on the chair, without the armrests (21, 22) restricting changes in sitting postures. The entire chair is easy to adjust and offers various adjustment methods, so that different adjustment requirements of users can be met.

Description

A seat adjustable to multiple usage states Technical Field

[0001] The utility model relates to the field of seats, in particular to a seat which can be adjusted to multiple usage states. Background Art

[0002] Office chairs are usually only suitable for sitting, but as people's working hours continue to increase, sitting for long periods of time often puts a burden on their physical health. People usually want to constantly change their sitting posture when working to reduce the burden on their body. Therefore, the demand for chairs with high adjustment freedom is increasing. For example, Chinese patent CN112890486A discloses a new multifunctional chair with adjustable armrests and backrests, allowing users to sit upright, lie flat, or lie on their side, with flexible adjustment options. Similarly, U.S. Patent US20220125205A1 discloses a multi-seat chair with adjustable armrests and backrests, which can be folded flat to form a workbench. However, these products suffer from cumbersome adjustment procedures. Both the backrest and armrests have locking mechanisms that require pressing down to adjust. Furthermore, after the backrest is adjusted, the armrests cannot be lowered to the chair legs. Therefore, when users want to sit backwards, either the armrests are placed upright or flat, significantly hindering them from shifting positions. Furthermore, after the backrest is adjusted to function as a workbench, users must adjust the backrest back to its original position to sit upright, otherwise their backs will be unsupported. This requires simultaneous adjustment of the seat, which is inconvenient and compromises the chair's freedom of movement. Therefore, a more user-friendly multi-position chair is needed. Technical issues

[0003] In view of the problem that the adjustable seats in the above-mentioned technology are not convenient to use, the utility model provides a seat that can be adjusted to multiple usage states. Technical Solutions

[0004] To achieve the above-mentioned object, the present invention provides a seat that can be adjusted to multiple usage states, including:

[0005] chair seats and legs;

[0006] Two armrests, the two armrests are symmetrically arranged on both sides of the seat;

[0007] A first chair back and a connecting mechanism, wherein the first chair back is connected to the seat via the connecting mechanism; one end of the first chair back is connected to the connecting mechanism; a connection between the first chair back and the connecting mechanism extends in a direction away from the connecting mechanism and smoothly expands in a direction perpendicular to the central axis of the connecting mechanism to form a support portion; the connecting mechanism also includes a chair back lifting device for driving the first chair back to be adjusted upward and lowered and reset;

[0008] a first angle adjustment mechanism;

[0009] The second chair back is connected to the first chair back through the first angle adjustment mechanism, one end of the first angle adjustment mechanism is set on the support part, and the other end is set on the second chair back; the first angle adjustment mechanism is used to adjust the angle between the backrest surface of the second chair back and the seat surface of the seat, so that the angle between the backrest surface of the second chair back and the seat surface of the seat is a certain angle between an acute angle and a superior angle.

[0010] As an improvement of the present application, it also includes a second angle adjustment mechanism and a third angle adjustment mechanism, one end of the second angle adjustment mechanism and the third angle adjustment mechanism are symmetrically arranged on both sides of the seat; the two armrests are connected to the seat through the second angle adjustment mechanism and the third angle adjustment mechanism respectively; the second angle adjustment mechanism and the third angle adjustment mechanism are used to adjust the angle between the inner side surface of the armrest and the seat surface of the seat, so that the angle between the inner side surface of the armrest and the seat surface of the seat is a certain angle between an acute angle and a superior angle; the two armrests are adjusted independently.

[0011] As an improvement of the present application, the armrest is further provided with an armrest support and an armrest support adjustment device, one end of the armrest support adjustment device is connected to the armrest support, and the other end is fixed inside the armrest, for adjusting the height of the armrest support; the armrest support adjustment device includes a lifting rod, a lifting sleeve with a lifting positioning slot, and a positioning rod, the lifting rod is provided with a through hole for the positioning rod to pass through, and the positioning rod is placed in the through hole; when adjusting the height, the positioning rod slides on the lifting positioning slot; after the adjustment is completed, the positioning rod is fixed in the lifting positioning slot.

[0012] As an improvement of the present application, the second angle adjustment mechanism and the third angle adjustment mechanism both include a first rotating arm, a second rotating arm, and a reset spring. The reset spring is fixed on the first rotating arm to increase the damping during reset and ensure that the second rotating arm is reset to its initial state.

[0013] As an improvement of the present application, a convex strip is provided on one end of the second chair back away from the chair seat.

[0014] As an improvement of the present application, a seat depth adjustment mechanism is provided at the connection between the connecting mechanism and the seat, and the seat depth adjustment mechanism includes adjusting the first chair back to several adjustment positions with different front-to-back distances from the seat.

[0015] As an improvement of the present application, a gas rod for adjusting the height and rotation direction of the seat is provided in the chair leg.

[0016] As an improvement of the present application, the seat includes a cushion structure, both ends of the cushion structure protrude from the seat and cover both ends of the seat. Beneficial effects

[0017] Compared with the prior art, the present invention provides a chair that can be adjusted to multiple usage states. It has two adjustable backrests. The first backrest serves as a basic backrest to provide back support for the user. The second backrest can be adjusted to a deflection angle with the first backrest. When not adjusted, one end of the second backrest is smoothly connected to one end of the first backrest, and together they serve as a backrest to provide support for the user. When the user wants to sit on the chair backward to work, the second backrest can be folded 90 degrees away from the seat. At this time, the second backrest is parallel to the seat, and the user can place laptops, books and other items on the second backrest and use it as a workbench. The second backrest can also be folded back to fit with the first backrest, forming a 270-degree angle with the front of the seat. At this time, the user can sit on the chair backward and work at a desk or workbench. The connecting side of the first backrest and the second backrest is a support portion that can provide support for the user's hands. The narrowed portion where the first backrest connects to the seat provides space for the user's thighs when sitting backward, thereby maximizing the freedom of use and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] FIG2 is a schematic diagram of one of the usage states of the present invention;

[0020] FIG3 is a schematic diagram of one of the usage states of the present invention;

[0021] FIG4 is a schematic diagram of an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of a handrail of the present invention;

[0023] FIG6 is an exploded view of the handrail of the present invention;

[0024] FIG7 is a schematic diagram of a second angle adjustment mechanism of the present invention;

[0025] Figure 8 is an exploded view of the second angle adjustment mechanism of the utility model;

[0026] Figure 9 is a schematic diagram of the connection mechanism of the present invention;

[0027] FIG10 is an exploded view of the connection mechanism of the present invention.

[0028] The main component symbols are described as follows:

[0029] 11. First backrest; 12. Second backrest; 13. Connecting mechanism; 14. First angle adjustment mechanism; 15. Raised strip; 131. Backrest lifting mechanism; 132. Seat depth adjustment mechanism; 1321. Rotating handle; 1322. Adjustment slot; 1323. Limiting slot; 21. First armrest; 22. Second armrest; 23. Second angle adjustment mechanism; 231. First rotating arm; 232. Second rotating arm; 233. Return spring ; 2311, fixed block; 2312, fixed spring piece; 2321, tooth groove; 24, third angle adjustment mechanism; 25, armrest support; 26, armrest support adjustment device; 261, lifting rod; 262, lifting sleeve with lifting positioning slot; 263, positioning rod; 264, adjustment switch; 265, lifting rod inner sleeve; 266, armrest support outer shell; 267, through slot; 268, rotating shaft; 3, chair seat; 4, chair leg; 41, gas rod. Best Mode for Carrying Out the Invention

[0030] The utility model is a chair that can be adjusted to multiple states, including two armrests, namely a first seat back 11 and a second seat back 12, a seat 3, and a chair leg 4. The seat 3 is connected to the seat leg 4, and the seat leg 4 is provided with a gas rod 41 for adjusting the seat height; the first seat back 11 is connected to the seat 3 through a connecting mechanism 13, and the second seat back 12 is connected to the first seat back 11 through a first angle adjustment mechanism 14; the connecting mechanism 13 also includes a seat back lifting device 131, and the seat back lifting device has its own adjustment gear. When adjusting, lifting the seat back can drive the seat back lifting device to change gears. After adjusting to the appropriate height, the seat back lifting device is automatically fixed without locking, simplifying the operation steps; when it is necessary to lower the seat back, lift the seat back to the highest gear, and the seat back can be lifted and lowered. The device can be lowered and reset, and then the chair back can be lifted up for adjustment; a gas rod 41 is provided inside the chair leg for adjusting the seat height and rotation direction; the first angle adjustment mechanism 14 can adjust the relative position of the second chair back 12 and the first chair back 11. Under normal conditions, the angles between the back of the first backrest and the back of the second backrest and the seat surface are consistent, providing back support when the user is sitting on the chair; the second chair back can be folded 90 degrees away from the seat through the first angle adjustment mechanism. At this time, the second chair back is parallel to the seat, and the second chair back can be used as a workbench or a small table. The second chair back can hold notebooks, books, tablets and other items. The user can enjoy a lightweight office experience by sitting on the chair backwards; through the first angle adjustment mechanism The degree adjustment mechanism folds the second chair back 180 degrees away from the seat. At this time, the second chair back is close to the first chair back. The user can sit on the chair with his back to use the desk or do other operations, and the second chair back will not interfere with the use. If the second chair back cannot be adjusted to be close to the first chair back, the second chair back may be against the desk, making it difficult for the user to work at the desk, causing inconvenience. Multiple adjustment methods increase the freedom of use and can meet the user's needs for changing postures. The connection between the first chair back 11 and the connecting mechanism 13 is narrow, and the connection extends away from the seat and smoothly expands to form a support portion. The backrest surface of the first chair back presents a structure similar to an inverted triangle. The first chair back and the connecting mechanism The connection is tightened inward compared to the support part, which can provide space for the thighs, so that the thighs can stretch freely when sitting backward, ensuring a certain degree of comfort; the transition between the support part and the connection is relatively smooth, which can protect the user from bumps when switching to a backward sitting position; the function of the first backrest is that when the user folds the second backrest as a workbench and wants to change posture, he can directly switch to another posture without adjusting the second backrest at the same time. When sitting upright, the first backrest can still provide back support, which can reduce the tediousness of changing postures to a certain extent; the advantage of two backrests is that the seat can meet not only sitting but also sleeping positions. The backrest is large enough to support the head when the user lies down, which provides a good user experience;During transportation, the second backrest can be folded to fit snugly against the first backrest, making transportation easier, saving significant transportation costs, and reducing the difficulty of transporting the seat. Modes for Carrying Out the Invention

[0031] Furthermore, it also includes a first armrest 21 and a second armrest 22. The first armrest 21 is connected to the seat 3 through a second angle adjustment mechanism 23, and the second armrest 22 is connected to the seat 3 through a third angle adjustment mechanism 24. The second angle adjustment mechanism and the third angle adjustment mechanism are symmetrically arranged on both sides of the seat and are respectively connected to the first armrest and the second armrest. The above two angle adjustment mechanisms can adjust the two armrests to a number of angles between an acute angle and a superior angle (greater than 180°) between the inner side surface of the armrest close to the seat and the seat surface, and The two armrests are independently adjustable; by adjusting either armrest to be flush with the seat, the user can sit sideways on the seat and use the upright armrest as a backrest. At this time, the second backrest can be adjusted to be parallel to the seat and used as a workbench; by adjusting both armrests to be flush with the seat, the user can lie sideways on the seat; the two armrests can also be adjusted to an angle of 270° between the inner side of the armrest and the seat surface. The lowered armrest will not hinder the user from sitting back, and the user can sit astride the seat more conveniently, which greatly optimizes the user experience.

[0032] Furthermore, the second angle adjustment mechanism and the third angle adjustment mechanism each include a first rotating arm 231, a second rotating arm 232, and a return spring 233; the first rotating arm 231 is provided with two L-shaped through grooves for placing a fixed block 2311 and a fixed spring 2312, the fixed spring is placed in the through groove and is not higher than the through groove, and one end of the fixed spring abuts against the fixed block; the fixed block is placed in the through groove and is not lower than the through groove; the second rotating arm includes two rotating disks, which clamp the first rotating arm therebetween, and both rotating disks are provided with tooth grooves 232 1. Both the first rotating arm and the second rotating arm are provided with through holes for the rotating shaft to pass through. Adjustment starts from the initial state where the angle between the inner side of the armrest and the seat surface is the smallest. The first rotating arm and the second rotating arm rotate axially relative to the rotating shaft. One side of the first rotating arm fixing block is stuck between the two tooth grooves, and the other side is stuck between the through grooves. Each tooth groove corresponds to an adjustment gear. When resetting, the second adjustment arm is deflected to a position greater than the maximum adjustment angle. At this time, the fixing block is disengaged from the abutment of the fixed spring piece. The second rotating arm is rotated to the initial position. The fixed spring piece re-engages with the fixed block and returns to the normal adjustment state. The angle of the armrest can be easily adjusted through the second angle adjustment mechanism and the third angle adjustment mechanism. When adjustment is required, only a push is required to adjust the armrest without loosening the locking structure, adjusting, and locking in three steps. The adjustment operation is simple and can greatly improve the convenience of use. The return spring is fixed on the first rotating arm, which can increase the adjustment damping, ensure smooth and gentle adjustment, and avoid the unpleasant experience caused by the armrest deflecting too large an angle when the armrest is gently pushed; the return spring also plays a limiting role. When the armrest is reset to its initial state, the return spring is in a balanced state. When the armrest is deflected toward the seat surface of the chair to a value less than the initial state, the return spring is in a compressed state, so that the armrest will not deflect excessively, causing extrusion and damage to the fixed spring piece.

[0033] Furthermore, an armrest support 25 and an armrest support adjustment device 26 are further provided inside the armrest; the armrest support is fixed to one end of the armrest support adjustment device; the armrest support adjustment device 26 includes a lifting rod 261, a lifting sleeve 262 with a lifting positioning groove, a positioning rod 263, an adjustment switch 264, a lifting rod inner sleeve 265, and an armrest support outer shell 266. The lifting rod 261 and the lifting rod inner sleeve 265 are both provided with a through groove 267 for accommodating the positioning rod, the positioning rod is placed in the through groove 267, and the lifting rod 261 is placed in the lifting rod inner sleeve 265; the lifting sleeve 262 is mounted on the outside of the lifting rod inner sleeve 265, and the positioning rod 261 slides in the lifting positioning groove; the lifting positioning groove includes the following: The armrest supports are equipped with a positioning slot and a sliding slot connected to the positioning slot. The positioning rod can be limited in any positioning slot. The armrest support outer sleeve is set outside the lifting sleeve, and the lifting sleeve is fixed to the inner wall of the armrest support outer sleeve. The armrest support outer sleeve is provided with a through slot for the adjustment switch to pass through, and one end of the adjustment switch is fixed to the lifting rod. When adjustment is required, the adjustment switch is pressed, and the adjustment switch pushes the lifting rod inward. At this time, the positioning rod in the through slot slides from any positioning slot to the sliding slot. At this time, the armrest support can be raised or lowered to adjust the height of the armrest support. After adjustment, the adjustment switch is released, the lifting rod resets, and the through slot squeezes the positioning rod from the sliding slot to the positioning slot. At this time, the height of the armrest support is fixed and the adjustment is complete. Both armrests are equipped with armrest supports and armrest support adjustment devices.

[0034] Furthermore, a rotating shaft 268 is provided at one end of the armrest support adjustment device connected to the armrest support, and the armrest support is connected to the armrest support adjustment device through the rotating shaft; one end of the armrest support can be pushed to make the armrest support rotate axially around the rotating shaft, and the position of the armrest support can be adjusted to make it more convenient for the user to lean on.

[0035] Furthermore, a ridge 15 is provided at the end of the second chair back 12 away from the seat 3. In normal use, that is, when the angles between the back of the first backrest and the back of the second backrest and the seat surface are consistent, the ridge can be used as a headrest to improve the comfort of the chair back and protect the health of the neck to a certain extent; when the second chair back is folded 90° away from the seat and used as a workbench, the ridge can play a certain limiting role, the foot pad of the notebook is close to the ridge, and one end of the notebook is placed on the ridge, making it less likely for the laptop to slip when placed on the second chair back.

[0036] Furthermore, the connecting mechanism 13 also includes a seat depth adjustment mechanism 132 that can adjust the distance between the first chair back 11 and the seat 3. The seat depth adjustment mechanism is adjusted by rotating the handle 1321. By rotating the rotating handle, the position of the tooth connected to the rotating handle in the adjustment slot 1322 can be adjusted. It also includes four limit slots 1323, which are parallel to the adjustment slots 1322 to limit the position and movement direction of the seat, that is, close to or away from the first chair back. Some users hope that their thighs will fall on the seat, with uniform force and the back close to the chair back. Some users hope that part of their thighs will be suspended in the air to speed up heat dissipation, and their usage preferences are inconsistent. Users of different body shapes will also have different experiences when sitting on the seat. Therefore, the seat depth adjustment mechanism can provide more usage options to meet the needs of different users.

[0037] Furthermore, a cushion is provided on the seat, both ends of which protrude from the seat and cover both ends of the seat. Both ends of the seat are covered with soft pads, which makes the contact areas between the user's legs and the two ends of the seat feel soft regardless of sitting upright or sitting backward, providing a good user experience.

[0038] Furthermore, the first chair back, the second chair back, the first armrest and the second armrest are all covered with cushions. Industrial Applicability

[0039] 1) The seat can be adjusted for seat depth, seat height, backrest angle, and armrest angle, offering a high degree of adjustment freedom and simple operation, saving time and effort. This balances adjustment freedom and convenience, unlike other seats on the market that offer free adjustment but compromise ease of use, providing a superior user experience.

[0040] 2) The chair has two segmented backrests. The upper backrest can be folded into a work surface, allowing users to transform the chair into a desk chair anytime, anywhere, with a high degree of freedom of use. The lower backrest is connected to the seat via a connecting mechanism and serves as the base backrest. When the user changes from a reclining sitting position using the folded upper backrest to an upright sitting position, they can still enjoy a certain degree of back support without adjusting the lower backrest. This meets the user's need to adjust their sitting posture at any time and avoids the disadvantage of the cumbersome and uncomfortable experience caused by adjusting the seat at the same time as adjusting the posture.

[0041] 3) The chair has two independently adjustable armrests. One fixed and one flat can be used as a backrest when the user sits sideways; both armrests flattened can be used as a reclining chair; both armrests folded down can facilitate the user to sit in the reverse position on the chair. There are various adjustment methods.

[0042] 4) The chair back and armrests can be easily adjusted through the angle adjustment mechanism without manual locking. The adjustment operation is simple and easy to use.

Claims

1. A chair that can be adjusted to multiple usage states, characterized in that: include: chair seats and legs; Two armrests, the two armrests are symmetrically arranged on both sides of the seat; A first chair back and a connecting mechanism, wherein the first chair back is connected to the seat via the connecting mechanism; the first chair back, one end of which is connected to the connecting mechanism; a connection between the first chair back and the connecting mechanism extends in a direction away from the connecting mechanism and smoothly expands in a direction perpendicular to the central axis of the connecting mechanism to form a support portion; the connecting mechanism includes a chair back lifting device for driving the first chair back to be adjusted upward and lowered and reset; a first angle adjustment mechanism; The second chair back is connected to the first chair back through the first angle adjustment mechanism, one end of the first angle adjustment mechanism is set on the support part, and the other end is set on the second chair back; the first angle adjustment mechanism is used to adjust the angle between the backrest surface of the second chair back and the seat surface of the seat, so that the angle between the backrest surface of the second chair back and the seat surface of the seat is a certain angle between an acute angle and a superior angle.

2. The seat adjustable to multiple usage states according to claim 1, characterized in that: It also includes a second angle adjustment mechanism and a third angle adjustment mechanism, one end of the second angle adjustment mechanism and the third angle adjustment mechanism are symmetrically arranged on both sides of the seat; the two armrests are connected to the seat through the second angle adjustment mechanism and the third angle adjustment mechanism respectively; the second angle adjustment mechanism and the third angle adjustment mechanism are used to adjust the angle between the inner side surface of the armrest and the seat surface of the seat, so that the angle between the inner side surface of the armrest and the seat surface of the seat is a certain angle between an acute angle and a superior angle; the two armrests are adjusted independently.

3. The seat adjustable to multiple usage states according to claim 1, characterized in that: The armrest is also provided with an armrest support and an armrest support adjustment device, one end of the armrest support adjustment device is connected to the armrest support, and the other end is fixed inside the armrest, which is used to adjust the height of the armrest support; the armrest support adjustment device includes a lifting rod, a lifting sleeve with a lifting positioning slot, and a positioning rod, the lifting rod is provided with a through hole for the positioning rod to pass through, and the positioning rod is placed in the through hole; when adjusting the height, the positioning rod slides on the lifting positioning slot; after the adjustment is completed, the positioning rod is fixed in the lifting positioning slot.

4. The seat adjustable to multiple usage states according to claim 2, characterized in that: The second angle adjustment mechanism and the third angle adjustment mechanism both include a first rotating arm, a second rotating arm, and a reset spring. The reset spring is fixed to the first rotating arm to increase the damping during reset and ensure that the second rotating arm is reset to the initial state.

5. The seat adjustable to multiple usage states according to claim 1, characterized in that: A convex strip is provided on one end of the second chair back away from the chair seat.

6. The seat adjustable to multiple usage states according to claim 1, characterized in that: A seat depth adjustment mechanism is provided at the connection between the connecting mechanism and the seat. The seat depth adjustment mechanism includes a plurality of adjustment gears for adjusting the first seat back to different front-to-back distances from the seat.

7. The seat adjustable to multiple usage states according to claim 1, characterized in that: The chair legs are provided with gas rods for adjusting the height and rotation direction of the seat.

8. The seat adjustable to multiple usage states according to claim 1, characterized in that: The seat comprises a cushion structure, both ends of which protrude from the seat and cover the two ends of the seat.

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