A single chair with foldable armrests

Abstract

This utility model discloses a single chair with foldable armrests, including a chair body. The chair body includes a first part and a second part. Foldable armrests are installed on both sides of the first part. A depth adjustment mechanism is provided between the first part and the second part. Each of the two foldable armrests has a notch at one end, and a turntable is rotatably connected to the inner wall of the notch. A movable support plate is installed at one end of the turntable, which can contact the top surface of the foldable armrest. A rotating base bracket is provided at the bottom of the foldable armrest, and a support lug is installed at the bottom of the foldable armrest. The foldable armrest achieves dynamic adaptation during arm movement through the rotation of the movable support plate and the elastic support of the compression spring. This not only avoids complete support failure when the arm is raised, but also solves the problem of position misalignment when the arm is lowered through the return spring and the turntable guidance, thus maintaining the continuity and convenience of the armrest support function.

Description

Technical Field

[0001] This utility model relates to the field of single chairs, specifically a single chair with foldable armrests. Background Technology

[0002] As a widely used seating tool in daily home and office settings, single chairs are often equipped with armrests on both sides to improve user comfort and functionality. The core function of these armrests is to provide support for the user's arms, help maintain a stable sitting posture, and thus reduce the burden on the shoulder, neck, and arm muscles. However, most existing single chair armrests use a fixed structure, which has significant drawbacks in actual use: when users need to move their arms up and down to adjust their posture, retrieve nearby items, or engage in natural activities, the fixed armrests cannot adapt synchronously with the arm's movement trajectory. This causes the arm to completely lose contact with the armrest during the lifting process, rendering the armrest's intended support function ineffective. Furthermore, when the arm is lowered again, due to the lack of positional guidance and adaptation, misalignment between the arm and armrest is very likely to occur, affecting not only ease of use but also potentially causing discomfort due to sudden positional deviation. At the same time, the seat support depth of existing single chairs is generally fixed, which cannot be adjusted according to the height, leg length and sitting habits of different users. For users with shorter leg length, the fixed support depth can easily cause pressure on the back of the knee (popliteal fossa) and affect blood circulation; for users with longer leg length, there will be insufficient support for the buttocks and the legs will be unsupported. It is difficult to meet the personalized use needs of users with different body types, resulting in a poor overall user experience.

[0003] Therefore, this utility model provides a single chair with foldable armrests. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a single chair with foldable armrests, thereby solving the problems of fixed armrests failing to adapt synchronously with arm movement and the seat support depth of the single chair not being adjustable.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a single chair with foldable armrests, comprising a chair body, the chair body comprising a first part and a second part, both sides of the first part having foldable armrests, and a depth adjustment mechanism provided between the first part and the second part, wherein each of the two foldable armrests has a notch at one end, a turntable rotatably connected to the inner wall of the notch, a movable support plate being installed at one end of the turntable, the movable support plate being in contact with the top surface of the foldable armrest, a rotating base bracket being provided at the bottom of the foldable armrest, a support ear being installed at the bottom of the foldable armrest, the rotating base bracket being rotatably connected to the inner side of the support ear, a compression spring being installed between the rotating base bracket and the movable support plate, the compression spring being located in the inner space of the corresponding notch, the depth adjustment mechanism comprising a fixed plate and two U-shaped guide plates, the fixed plate being installed inside the first part, the two U-shaped guide plates being installed at the bottom end of the second part, and the fixed plate being slidably connected between the second part and the two U-shaped guide plates.

[0006] Preferably, the top of the movable tray is provided with a support groove to enhance the arm restraint effect.

[0007] Preferably, the bottom of the movable support plate is hinged with a screw, the side wall of the screw is threaded with a threaded ring, the threaded ring is located at the bottom of the rotating base, the screw is slidably connected to the inner wall of the rotating base, and the compression spring is sleeved on the outer side of the corresponding compression spring.

[0008] Preferably, a convex plate is installed at the bottom of the fixed plate, and a clamping plate is installed on both sides of the convex plate. Guide grooves are opened on opposite sides of the two U-shaped guide plates, and the clamping plates are slidably connected to the inner wall of the corresponding guide groove.

[0009] Preferably, the convex plate has an inner sliding groove, and two L-shaped limiting plates are slidably connected to the inner wall of the inner sliding groove. Several slots are opened in the two guide sliding grooves, and the L-shaped limiting plates are inserted into the inner wall of the corresponding slots.

[0010] Preferably, a reset spring and a limiting inner rod are provided between the two L-shaped limiting plates. The reset spring is sleeved on the outside of the limiting inner rod, and the limiting inner rod is slidably connected to the inner wall of the two L-shaped limiting plates.

[0011] Compared with existing technologies, this invention offers the following advantages: The folding armrest of this invention achieves dynamic adaptation during arm movement through the rotation of the movable support plate and the elastic support of the compression spring. This avoids complete support failure when the arm is raised and solves the problem of misalignment when the arm is lowered through the reset spring and turntable guidance, maintaining the continuity and convenience of the armrest's support function. The depth adjustment mechanism of this invention, through the sliding cooperation of the fixed plate and the U-shaped guide plate, allows the seat support depth to be flexibly adjusted according to the user's body shape. This effectively solves the problems of insufficient support and pressure on the popliteal fossa caused by a fixed depth for users with different leg lengths, meeting personalized usage needs and significantly improving the comfort and practicality of the chair. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0014] Figure 3 This is the utility model Figure 2 A magnified view of the structure at point A in the middle;

[0015] Figure 4 This is a schematic diagram of the notch structure in this utility model;

[0016] Figure 5 This is a schematic diagram of the depth adjustment mechanism in this utility model.

[0017] In the diagram: 1. Chair body; 11. First part; 12. Second part; 2. Folding armrest; 21. Notch; 22. Turntable; 23. Movable support plate; 231. Support groove; 24. Rotating base bracket; 25. Compression spring; 26. Screw; 27. Threaded ring; 3. Depth adjustment mechanism; 31. Fixing plate; 32. U-shaped guide plate; 321. Guide groove; 322. Slot; 34. Protruding plate; 341. Inner groove; 35. Locking plate; 36. L-shaped limiting insert plate; 37. Return spring; 38. Limiting inner rod. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5 A single chair with foldable armrests includes a single chair body 1, the single chair body 1 includes a first part 11 and a second part 12, foldable armrests 2 are installed on both sides of the first part 11, and a depth adjustment mechanism 3 is provided between the first part 11 and the second part 12.

[0020] Each of the two folding handrails 2 has a notch 21 at one end. A turntable 22 is rotatably connected to the inner wall of the notch 21. A movable support plate 23 is installed at one end of the turntable 22. The movable support plate 23 can contact the top surface of the folding handrail 2. A rotating base bracket 24 is provided at the bottom of the folding handrail 2. A support ear is installed at the bottom of the folding handrail 2. The rotating base bracket 24 is rotatably connected to the inner side of the support ear. A compression spring 25 is installed between the rotating base bracket 24 and the movable support plate 23. The compression spring 25 is located in the internal space of the corresponding notch 21.

[0021] It should be noted that the folding armrest 2 and the movable support plate 23 described in this embodiment provide elastic support for the arm.

[0022] The depth adjustment mechanism 3 includes a fixed plate 31 and two U-shaped guide plates 32. The fixed plate 31 is installed inside the first part 11, and the two U-shaped guide plates 32 are installed at the bottom of the second part 12. The fixed plate 31 is slidably connected between the second part 12 and the two U-shaped guide plates 32.

[0023] Specifically, the first component 11 consists of a backrest and rear legs, and the second component 12 consists of a seat and front legs. When using this chair, after the user sits down, their arms can naturally rest on the folding armrest 2. At this time, the movable support plate 23, under the elastic action of the compression spring 25, maintains contact with the top surface of the folding armrest 2 through the turntable 22, forming a stable support for the forearm. When the user needs to adjust their arm posture, such as raising their arm to pick up or put down an item, the upward force of the arm will drive the movable support plate 23 to rotate around the turntable 22. At the same time, the compression spring 25 is further compressed, and the rotating base bracket 24 rotates synchronously around the lug with the rotation of the movable support plate 23, providing a stable deformation space for the spring. During this process, the rebound force of the compression spring 25 always acts on the movable support plate 23, allowing the armrest to move with the armrest. The arm maintains elastic contact during the lifting trajectory, avoiding the sudden failure of support in traditional fixed armrests. When the arm is lowered, the elasticity of the compression spring 25 pushes the movable support plate 23 to automatically reset. In conjunction with the rotation guide of the turntable 22, it ensures that the arm can accurately return to the armrest support position, preventing misalignment. For seat depth adjustment, users can push or pull the first part 11 and the second part 12 according to their height and leg length, so that the fixed plate 31 installed on the inner side of the first part 11 slides along the two U-shaped guide plates 32 at the bottom of the second part 12. By changing the relative distance between the back panel and the seat, the support depth can be adjusted. Users with shorter leg lengths can shorten the depth to avoid pressure on the popliteal fossa; users with longer leg lengths can increase the depth to ensure sufficient support for the buttocks and natural leg placement.

[0024] In one embodiment of this utility model, such as Figures 1-5 As shown, the top of the movable support plate 23 is provided with a support groove 231 to increase the arm restraint effect.

[0025] Specifically, the support groove 231 provided at the top of the movable support plate 23 can adapt to the shape of the arm when the arm is placed on the movable support plate 23, and play a limiting role for the arm placed on it. Through this limiting, the arm can be effectively prevented from sliding or shifting left and right or forward and backward on the movable support plate 23, making the arm placed on the movable support plate 23 more stable, further improving the stability of arm support, and allowing users to experience more comfort and reliability when supporting their arms with the folding armrest 2 and the movable support plate 23.

[0026] In one embodiment of this utility model, such as Figures 1-5 As shown, a screw 26 is hinged to the bottom of the movable support plate 23, and a threaded ring 27 is threaded to the side wall of the screw 26. The threaded ring 27 is located at the bottom of the rotating base bracket 24, and the screw 26 is slidably connected to the inner wall of the rotating base bracket 24. A compression spring 25 is sleeved on the outer side of the corresponding compression spring 25.

[0027] Specifically, the screw 26 hinged to the bottom of the movable tray 23 can slide relative to the rotating base bracket 24. The compression spring 25 sleeved on the outside of the screw 26 can provide elastic support for the movable tray 23. When the threaded ring 27 is rotated, since the threaded ring 27 is threadedly connected to the screw 26 and is located at the bottom of the rotating base bracket 24, the threaded ring 27 will move along the axial direction of the screw 26, thereby changing the compression amount of the compression spring 25. The change in the compression amount of the compression spring 25 can adjust its elastic support force on the movable tray 23, thereby adapting to the support strength required when different users place their arms, and improving the comfort and adaptability of arm support.

[0028] In one embodiment of this utility model, such as Figures 1-5 As shown, a protruding plate 34 is installed at the bottom of the fixed plate 31, and a clamping plate 35 is installed on both sides of the protruding plate 34. A guide groove 321 is opened on the opposite side of the two U-shaped guide plates 32, and the clamping plate 35 is slidably connected to the inner wall of the corresponding guide groove 321.

[0029] Specifically, clamping plates 35 are installed on both sides of the protruding plate 34 at the bottom of the fixing plate 31. When adjusting the seat support depth of the single chair and pushing or pulling the first split 11 and the second split 12, the clamping plates 35 will slide on the inner wall of the guide groove 321 on the opposite side of the U-shaped guide plate 32. The guide groove 321 provides directional guidance for the sliding of the clamping plates 35, so that the fixing plate 31 can slide stably and accurately along the U-shaped guide plate 32, thereby ensuring the smoothness and accuracy of the relative position adjustment between the first split 11 and the second split 12, and realizing the smooth adjustment of the seat support depth to adapt to the sitting posture needs of different users.

[0030] In one embodiment of this utility model, such as Figures 1-5As shown, an inner groove 341 is provided in the protruding plate 34, and two L-shaped limiting plates 36 are slidably connected to the inner wall of the inner groove 341. Several slots 322 are provided in the two guide grooves 321, and the L-shaped limiting plates 36 are inserted into the inner wall of the corresponding slots 322.

[0031] Specifically, when adjusting the seat support depth of a single chair via the depth adjustment mechanism, first push the two L-shaped limiting inserts 36 in the inner groove 341 of the protruding plate 34, causing them to slide along the inner wall of the inner groove 341 and disengage from the slot 322 in the guide groove 321 of the U-shaped guide plate 32, thus releasing the restriction on the relative position of the fixing plate 31 and the U-shaped guide plate 32. Then, push or pull the first split 11 and the second split 12, causing the fixing plate 31 to drive the protruding plate 34 and the locking plate 35 to slide along the guide groove 321 until... Once the seat support depth is adjusted to meet the user's needs, the L-shaped limiting plate 36 is released, allowing it to reset along the inner slide groove 341 under its own or external force. It is then re-inserted into the inner wall of the corresponding slot 322. Through the snap-fit ​​between the L-shaped limiting plate 36 and the slot 322, the relative positions of the fixing plate 31 and the U-shaped guide plate 32 are locked, thereby fixing the adjusted seat support depth and preventing positional displacement due to force during use, ensuring the stability and reliability of the seat depth after adjustment.

[0032] In one embodiment of this utility model, such as Figures 1-5 As shown, a reset spring 37 and a limiting inner rod 38 are provided between the two L-shaped limiting plates 36. The reset spring 37 is sleeved on the outside of the limiting inner rod 38, and the limiting inner rod 38 is slidably connected to the inner wall of the two L-shaped limiting plates 36.

[0033] Specifically, when the seat support depth needs to be adjusted, the two L-shaped limiting plates 36 are pressed inwards towards the inside of the convex plate 34. At this time, the L-shaped limiting plates 36 slide along the inner wall of the inner slide groove 341 and move closer to each other, simultaneously compressing the return spring 37 sleeved on the outside of the limiting inner rod 38. The L-shaped limiting plates 36 will disengage from the slots 322 in the guide slide groove 321, releasing the locking of the relative position of the fixing plate 31 and the U-shaped guide plate 32. Subsequently, the first split 11 and the second split 12 can be pushed or pulled to achieve seat depth adjustment. Once the depth is adjusted to the target position, release the pressure on the L-shaped limiting insert 36. The compressed reset spring 37 releases its elasticity, pushing the two L-shaped limiting inserts 36 to slide back along the inner slide groove 341. At the same time, the L-shaped limiting inserts 36 slide along the inner wall of the limiting inner rod 38. The limiting inner rod 38 provides directional guidance for the sliding of the L-shaped limiting inserts 36, preventing them from deviating. Finally, the L-shaped limiting inserts 36 are accurately inserted into the corresponding slots 322, re-locking the seat depth and ensuring stable position during use.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] Working principle: After the user sits down, the arm is naturally placed on the movable support plate (23) of the folding armrest (2). The support groove (231) at the top of the support plate is adapted to the shape of the arm and limits its movement to prevent the arm from sliding. Under the elastic action of the compression spring (25), the movable support plate (23) contacts the top surface of the armrest through the turntable (22) to form a stable support. When the arm is raised, the movable support plate (23) rotates around the turntable (22), the compression spring (25) is further compressed, and the rotating base bracket (24) rotates around the support lugs in sync. The spring rebound force always keeps the support plate in contact with the arm to avoid support failure. When the arm is lowered, the spring pushes the support plate to reset, and the turntable (22) guides the arm back precisely. When the screw is turned down, the threaded ring (27) can move along the screw (26) axially, changing the compression amount of the compression spring (25) and adjusting the support force to suit different users. When adjusting the seat depth, press the L-shaped limiting insert (36) inward to compress the reset spring (37) and disengage it from the slot (322). Push or pull the first part (11) and the second part (12). The fixing plate (31) drives the convex plate (34) and the card plate (35) to slide along the guide groove (321). After the adjustment is in place, release the insert, and the reset spring (37) pushes the insert along the limiting inner rod (38) to reset and insert into the corresponding slot (322) to lock the seat depth and suit the needs of users with different heights and leg lengths.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single chair with foldable armrests, comprising a chair body (1), said chair body (1) comprising a first part (11) and a second part (12), characterized in that, Folding armrests (2) are installed on both sides of the first segment (11), and a depth adjustment mechanism (3) is provided between the first segment (11) and the second segment (12). Two folding armrests (2) each have a notch (21) at one end. A turntable (22) is rotatably connected to the inner wall of the notch (21). A movable support plate (23) is installed at one end of the turntable (22). The movable support plate (23) can contact the top surface of the folding armrest (2). A rotating base bracket (24) is provided at the bottom of the folding armrest (2). A support ear is installed at the bottom of the folding armrest (2). The rotating base bracket (24) is rotatably connected to the inside of the support ear. A compression spring (25) is installed between the rotating base bracket (24) and the movable support plate (23). The compression spring (25) is located in the internal space of the corresponding notch (21). The depth adjustment mechanism (3) includes a fixed plate (31) and two U-shaped guide plates (32). The fixed plate (31) is installed inside the first split (11), and the two U-shaped guide plates (32) are installed at the bottom of the second split (12). The fixed plate (31) is slidably connected between the second split (12) and the two U-shaped guide plates (32).

2. A single chair with foldable armrests according to claim 1, characterized in that, The top of the movable tray (23) is provided with a support groove (231) to increase the arm restraint effect.

3. A single chair with foldable armrests according to claim 1, characterized in that, The bottom of the movable tray (23) is hinged with a screw (26), and the side wall of the screw (26) is threaded with a threaded ring (27). The threaded ring (27) is located at the bottom of the rotating base bracket (24). The screw (26) is slidably connected to the inner wall of the rotating base bracket (24), and the compression spring (25) is sleeved on the outside of the corresponding compression spring (25).

4. A single chair with foldable armrests according to claim 1, characterized in that, The bottom of the fixed plate (31) is equipped with a convex plate (34), and a clamping plate (35) is installed on both sides of the convex plate (34). The two U-shaped guide plates (32) are provided with guide grooves (321) on opposite sides, and the clamping plate (35) is slidably connected to the inner wall of the corresponding guide groove (321).

5. A single chair with foldable armrests according to claim 4, characterized in that, The convex plate (34) has an inner groove (341) inside, and two L-shaped limiting plates (36) are slidably connected to the inner wall of the inner groove (341). Several slots (322) are opened in the two guide grooves (321), and the L-shaped limiting plates (36) are inserted into the inner wall of the corresponding slots (322).

6. A single chair with foldable armrests according to claim 5, characterized in that, A reset spring (37) and a limiting inner rod (38) are provided between the two L-shaped limiting plates (36). The reset spring (37) is sleeved on the outside of the limiting inner rod (38), and the limiting inner rod (38) is slidably connected to the inner wall of the two L-shaped limiting plates (36).

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