Angle adjuster and seat having the same

Abstract

The utility model relates to the field of seat accessory, provide an angle regulator and the seat with the angle regulator of having, angle regulator includes the hinge's adjusting arm and reference arm, and there is arc tooth section in adjusting arm inboard, and the reference arm has the stopper, and its tooth part elastically engages arc tooth section, still contain coaxial cam plate, and its protruding part is more than arc tooth section, and adjusting arm is equipped with first, second lever. When the stopper tooth part engages, adjusting arm unidirectional rotation, first lever pushes cam plate and makes protruding part resist pressure tooth part, and adjusting arm bidirectional rotation, second lever pushes cam plate, and tooth part reengages. The scheme can be two -way adjustment with one hand, and the structure is compact with the unlocking and the adjustment linkage, and the adjustment range is big.

Description

Technical Field

[0001] This utility model relates to the field of seat accessories technology, and in particular to an angle adjuster and a seat having the angle adjuster. Background Technology

[0002] Traditional chair armrests have significant functional limitations, primarily in the mechanical means of angle adjustment. Fixed armrests or simple height-adjustable structures struggle to meet the multifunctional needs of modern users, especially in scenarios such as home relaxation and office rest, where users frequently require quick adjustments to the armrest angle based on the situation. For example, a stable back support is needed when lying on one's side, an expanded platform area is needed for temporary storage, and a suitable contact surface is required when interacting with pets.

[0003] Existing adjustment mechanisms using gear locking or bolt fastening have three core drawbacks: First, mechanical operation is cumbersome, requiring users to use both hands to complete the entire process of unlocking, adjusting, and relocking, making instant switching with one hand impossible. Second, the structural design results in limited functionality, with a typical angle adjustment range not exceeding 30 degrees, failing to achieve omnidirectional adjustment from vertical support to horizontal expansion. Third, movement is restricted, with most mechanisms only allowing unidirectional gradual adjustment, requiring reverse operation of the entire mechanism for resetting, severely impacting usability. These shortcomings make it difficult for existing seats to simultaneously meet the complex functional requirements of rapid adjustment, a large angle range, and bidirectional free movement, limiting the potential for improvement in ergonomics and scenario adaptability.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an angle adjuster and a seat equipped with the angle adjuster, which has the advantages of enabling bidirectional free adjustment with one-handed operation, coordinated unlocking and adjustment actions, a large angle adjustment range, and a compact structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This application provides an angle adjuster, the technical solution of which is as follows: The angle adjuster includes an adjusting arm and a reference arm hinged together. The adjusting arm has an arc-shaped toothed segment inside the hinge axis, and a stop block is rotatably mounted on the reference arm. The teeth on the stop block elastically engage with the arc-shaped toothed segment. The feature is that it further includes a cam plate, which is coaxially mounted on the hinge axis of the adjusting arm and the reference arm. The outer edge of the protrusion of the cam plate extends radially beyond the arc-shaped toothed segment. The adjusting arm has a first lever and a second lever along the rotation path of the cam plate. When the teeth of the stop block engage with the arc-shaped tooth segment, the adjusting arm can only rotate in one direction relative to the reference arm. When the adjusting arm rotates relative to the reference arm and drives the first lever to rotate the cam plate to the radial position where the protrusion is radially opposite to the teeth, the protrusion presses against the teeth of the stop block, causing it to disengage from the arc-shaped tooth segment, and the adjusting arm can rotate in both directions relative to the reference arm. When the adjusting arm rotates relative to the reference arm and drives the second lever to rotate the cam plate to the radial position where the protrusion moves out of the radial position relative to the teeth, the teeth of the stop block re-engage with the arc-shaped tooth segment under the action of elasticity.

[0008] Furthermore, this application also proposes that an arc-shaped notch is provided on the cam plate; a first lever and a second lever are provided on the adjusting arm and extend into the arc-shaped notch; during the process of the adjusting arm rotating clockwise or counterclockwise relative to the reference arm, the first lever or the second lever acts on the side wall of the arc-shaped notch to rotate the cam plate.

[0009] Furthermore, this application also proposes that a tension spring be provided on the reference arm, with one end of the tension spring fixed to the reference arm and the other end connected to the other end of the stop block opposite to the tooth.

[0010] Furthermore, this application also proposes that the reference arm includes two parallel and spaced reference side plates, which are connected by a first rotating shaft and a second rotating shaft; an adjusting arm and a cam plate are rotatably mounted on the first rotating shaft and located between the two reference side plates; and a stop block is rotatably mounted on the second rotating shaft and located between the two reference side plates.

[0011] Furthermore, the adjusting arm includes two parallel and spaced adjusting side plates, which are connected by a first rotating shaft, and the cam plate is located between the two adjusting side plates.

[0012] Furthermore, this application also proposes that a first connecting plate be provided on the outer end of the reference arm away from the hinge axis; and a second connecting plate be provided on the outer end of the adjusting arm away from the hinge axis.

[0013] Furthermore, this application also proposes a seat, including the aforementioned angle adjuster.

[0014] Furthermore, this application also proposes that the seat includes a seat, a backrest disposed at the rear of the seat, legs disposed below the seat, and armrest side panels hinged to both sides of the seat; the armrest side panels are connected to the side of the seat via an angle adjuster, wherein the reference arm of the angle adjuster is connected to the seat, and the adjusting arm is connected to the armrest side panel.

[0015] As can be seen from the above, the angle adjuster and seat provided in this application, through the linkage design of the cam plate and the lever, automatically trigger the engagement and disengagement of the stop block during the rotation of the adjusting arm, so that the unlocking and bidirectional adjustment actions can be completed with one hand. It has the advantages of compact structure, convenient operation and 180-degree range adjustment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the leveling state of an angle adjuster provided in this application.

[0017] Figure 2 This is a schematic diagram of the angle adjustment state of an angle adjuster provided in this application.

[0018] Figure 3 This is a schematic diagram of the angle adjuster in one-way adjustment mode.

[0019] Figure 4 This is a schematic diagram showing the state where the teeth on the angle adjuster are disengaged from the arc-shaped tooth segment.

[0020] Figure 5 This is a schematic diagram showing how the second lever on the angle adjuster pushes the cam plate to rotate in the opposite direction.

[0021] Figure 6 This is a schematic diagram showing the re-engagement state of the teeth on the angle adjuster with the arc-shaped tooth segment.

[0022] Figure 7 This is a schematic diagram of the seat described in Example 2. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The following description, with reference to the accompanying drawings, further details the embodiments.

[0024] The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Example 1:

[0030] like Figure 1-6As shown, this embodiment relates to an angle adjuster, which includes an adjusting arm 1 and a reference arm 2 hinged together. An arc-shaped toothed segment 11 is provided on the inner side of the hinge axis of the adjusting arm 1. A stop block 3 with teeth 31 is rotatably mounted on the reference arm 2, and the teeth 31 elastically engage with the arc-shaped toothed segment 11. A cam plate 4 is coaxially mounted on the hinge axis, and the outer edge of its protrusion 41 radially extends beyond the arc-shaped toothed segment 11. A first lever 12 and a second lever 13 are provided on the adjusting arm 1 along the rotation path of the cam plate 4. When the teeth 31 engage with the arc-shaped toothed segment 11, the adjusting arm 1 can only rotate in one direction; when the adjusting arm 1 rotates, it drives the first lever 12 to move the cam plate 4, causing the protrusion 41 to press against the teeth 31 and disengage, allowing the adjusting arm 1 to rotate in both directions; when the second lever 13 moves the cam plate 4, causing the protrusion 41 to move out, the teeth 31 re-engage.

[0031] Among them, the arc-shaped tooth segment 11 refers to the arc-shaped tooth structure distributed along the inner side of the hinge axis of the adjusting arm 1. Specifically, it can be implemented using an involute tooth shape or a rectangular tooth shape. Its tooth pitch matches the tooth portion 31 of the stop block 3, and is used to limit the adjusting arm 1 in the meshing state.

[0032] Unidirectional rotation. The toothed portion 31 of the stop block 3 refers to the protruding structure provided on the rotatable stop block 3. Specifically, it can adopt a tooth profile design complementary to the arc toothed segment 11, and maintain the meshing pressure with the arc toothed segment 11 through an elastic element. The protruding portion 41 of the cam plate 4 refers to the protruding area extending outward from the main body of the cam plate 4. Specifically, it can adopt an eccentric arc or wedge structure, and its outer diameter is larger than the distribution radius of the arc toothed segment 11. It is used to squeeze the stop block 3 when rotated to a specific angle. The first lever 12 and the second lever 13 refer to rigid protrusions fixed on the adjusting arm 1. Specifically, they can adopt a cylindrical pin or a plate structure. Their positions correspond to the start and end points of the rotation path of the cam plate 4, respectively, and transmit rotational driving force by contacting the side wall of the notch of the cam plate 4.

[0033] Specifically, such as Figure 3 As shown, in the initial state, the teeth 31 of the stop block 3 mesh with the arc-shaped tooth segment 11 of the adjusting arm 1, restricting the adjusting arm 1 to rotate only in one direction. When the user pushes the adjusting arm 1 to the extended position in one direction, as... Figure 4 The first lever 12, as shown, contacts the side wall of the notch in the cam plate 4 and drives it to rotate, causing the protrusion 41 to rotate to a position radially opposite to the tooth 31. At this time, the outer edge of the protrusion 41 presses against the tooth 31 of the stop block 3, overcoming the elastic force and disengaging it from the meshing state, thus releasing the unidirectional rotation restriction. In this state, the adjusting arm 1 can rotate freely in both directions to meet the return requirement. When a reset is required, such as... Figure 5 As shown, rotating the adjusting arm 1 in the opposite direction drives the second lever 13 to push the cam plate 4 to rotate in the opposite direction, as... Figure 6 The protrusion 41 is moved out of its radial relative position. The stop block 3 is reset under the action of the elastic element, and the tooth 31 re-engages with the arc tooth segment 11, restoring the one-way locking function.

[0034] Compared to existing technologies, traditional solutions require manual operation of an independent unlocking mechanism to switch the locking state. This solution, however, automatically triggers the rotation of the cam plate 4 by rotating the adjusting arm 1, achieving a mechanical linkage switch between the locking and unlocking states. Existing technologies require complex multi-stage gear sets for bidirectional adjustment; this solution utilizes a single cam plate 4 structure in conjunction with an elastic stop block 3, achieving bidirectional free adjustment while maintaining structural compactness. Furthermore, traditional planar unfolding mechanisms require an additional unfolding locking device; this solution, through automatic switching between unidirectional locking and bidirectional free states, allows the armrest to be used directly as a continuous plane after unfolding. Through the above technical solutions, this application achieves single-handed operation for switching between armrest angle adjustment and planar unfolding. When unfolded into a planar state, the user only needs to push the adjusting arm 1 to the working position in one direction; the mechanism automatically releases the lock and allows for bidirectional fine-tuning of the planar angle. To reset, simply rotate the adjusting arm 1 in the opposite direction to automatically restore the locking state, requiring no additional steps. This design allows the seat armrest to be quickly converted into a reclining support platform or a temporary storage surface, while maintaining structural stability and smooth operation.

[0035] In a further embodiment, the cam plate 4 is provided with an arc-shaped notch 42; the first lever 12 and the second lever 13 are disposed on the adjusting arm 1 and extend into the arc-shaped notch 42. During the clockwise or counterclockwise rotation of the adjusting arm 1 relative to the reference arm 2, the first lever 12 or the second lever 13 acts on the side wall of the arc-shaped notch 42 to rotate the cam plate 4. The arc-shaped notch 42 refers to a groove structure with a specific curvature opened on the edge of the cam plate 4, which can be formed by stamping or milling. Its curvature matches the rotation angle of the cam plate 4, used to limit the movement trajectory of the lever and provide a contact surface. The first lever 12 and the second lever 13 are rigid protrusion structures fixed to the adjusting arm 1, which can be installed by welding or riveting. Their ends extend into the arc-shaped notch 42 to push the side wall of the notch when the adjusting arm 1 rotates. When the adjusting arm 1 rotates clockwise relative to the reference arm 2, the first lever 12 contacts the first side wall of the arc-shaped notch 42 and pushes the cam plate 4 along the first direction.

[0036] The adjustment arm 1 rotates counterclockwise, causing the protrusion 41 to be radially opposite to the tooth 31. When the adjustment arm 1 rotates counterclockwise, the second lever 13 contacts the second sidewall of the arc-shaped notch 42 and pushes the cam plate 4 to rotate in the second direction, causing the protrusion 41 to move out of its radially opposite position. The sidewall of the arc-shaped notch 42 and the contact surface of the lever form a sliding fit. The rotation angle of the cam plate 4 is controlled by the tilt angle of the sidewall, and the length of the notch limits the stroke of the lever, ensuring that the cam plate 4 rotates within a predetermined angle range.

[0037] In a specific implementation, a tension spring 5 is provided on the reference arm 2. One end of the tension spring 5 is fixed to the reference arm 2, and the other end is connected to the other end of the stop block 3 opposite to the tooth 31. The tension spring 5 is a mechanical element used to provide elastic restoring force, which can be implemented as a helical tension spring. Its two ends are fixedly connected to the reference arm 2 and the stop block 3, respectively. The tension spring 5 is stretched and stores elastic potential energy when the stop block 3 disengages from the arc tooth segment 11. After the cam plate 4 releases its pressure, it releases the potential energy to drive the stop block 3 to reset. The other end of the stop block 3 opposite to the tooth 31 refers to the area of ​​the stop block 3 away from the tooth 31. This can be achieved by providing a connecting hole or hook structure at the tail of the stop block 3. This area is connected to the tension spring 5 to form a lever arm, so that the torque generated by the tension of the tension spring 5 can overcome the meshing resistance of the tooth 31. When the cam plate 4 rotates to the point where the protrusion 41 presses against the stop block 3, the stop block 3 rotates around the second pivot 23, causing the tooth 31 to disengage from the arc-shaped tooth segment 11. At this time, the tension spring 5 is stretched and generates a reverse torque. When the cam plate 4 moves out of the pressing position with the adjustment arm 1, the contraction force of the tension spring 5 drives the stop block 3 to rotate in the opposite direction, forcing the tooth 31 to re-engage with the arc-shaped tooth segment 11. During this process, the elastic restoring force of the tension spring 5 always acts on the non-toothed end of the stop block 3, forming a balancing torque opposite to the meshing torque of the tooth 31, ensuring that the stop block 3 automatically resets after the external force is released.

[0038] like Figure 1 and 2 As shown, the reference arm 2 includes two parallel and spaced reference side plates 21, which are connected by a first rotating shaft 22 and a second rotating shaft 23. The adjusting arm 1 and the cam plate 4 are rotatably mounted on the first rotating shaft 22 and located between the two reference side plates 21. The stop block 3 is rotatably mounted on the second rotating shaft 23 and located between the two reference side plates 21. Specifically, the adjusting arm 1 includes two parallel and spaced adjusting side plates 10, which are connected by a first rotating shaft 22, and the cam plate 4 is located between the two adjusting side plates 10.

[0039] The parallel, spaced reference side plate 21 and adjusting side plate 10 are two plate-shaped components with the same shape and a fixed spacing. Specifically, they can be formed by welding or riveting stamped metal sheets to create a frame structure, forming a stable support surface through the double-plate structure. The first rotating shaft 22 and the second rotating shaft 23 are two parallel cylindrical rods. Specifically, they can be cold-drawn steel bars passing through both ends of the reference side plate 21 and fixed with nuts, used to separate the movement areas of the adjusting arm 1 and the stop block 3. The adjusting arm 1 and the cam plate 4 are mounted on the first rotating shaft 22, meaning they both have shaft holes matching the shaft and rotate coaxially. Specifically, they can be bushings with self-lubricating bearings manufactured using powder metallurgy to ensure smooth rotation. The stop block 3 is mounted on the second rotating shaft 23, meaning it has a rotation fulcrum independent of the first rotating shaft 22. Specifically, it can be a plastic part with shaft holes manufactured using injection molding to avoid friction with the adjusting arm 1.

[0040] Specifically, the two reference side plates 21 form a rigid frame, and two independent kinematic pairs are formed by the first rotating shaft 22 and the second rotating shaft 23. The adjusting arm 1 and the cam plate 4 are restricted to rotating within the region of the first rotating shaft 22 between the reference side plates 21.

[0041] The wall provides axial restraint to the adjusting arm 1, preventing lateral displacement during rotation. The stop block 3 is constrained to swing within the region of the second rotating shaft 23 between the reference side plates 21. The spacing between the side plates limits its swing amplitude, ensuring a constant engagement depth between the tooth 31 and the arc-shaped tooth segment 11. The separate arrangement of the first rotating shaft 22 and the second rotating shaft 23 spatially isolates the rotational motion of the adjusting arm 1 from the swinging motion of the stop block 3, avoiding motion interference. The enclosed space formed by the reference side plates 21 provides dust protection for the internal components, reducing the entry of external impurities into the meshing area. Through the above technical solution, this application achieves physical isolation of the motion trajectories of the adjusting arm 1 and the stop block 3, eliminating frictional losses between rotating components. The double-side plate structure improves overall rigidity, ensuring a constant shaft spacing and maintaining the meshing accuracy of the tooth 31. The enclosed frame simplifies the assembly process; all moving parts are integrated between the reference side plates 21, ensuring assembly coaxiality without additional positioning fixtures. The dual-shaft design makes the adjusting arm 1 and the stop block 3 form an independent motion pair, avoiding motion interference during linkage operation.

[0042] Furthermore, a first connecting plate 24 is provided at the outer end of the reference arm 2 away from the hinge axis, and a second connecting plate 14 is provided at the outer end of the adjusting arm 1 away from the hinge axis. The first connecting plate 24 is a plate-like structure fixedly connected to the outer end of the reference arm 2, which can be achieved by welding or bolting, and can be used to form a rigid connection between the reference arm 2 and the seat body. The second connecting plate 14 is a plate-like structure fixedly connected to the outer end of the adjusting arm 1, which can be manufactured by stamping or casting, and can be used to form a detachable connection with external expansion components. Specifically, the first connecting plate 24 is fixed to the side of the seat 100 by bolts to form the mounting base of the reference arm 2; the second connecting plate 14 is connected to the armrest side plate 400 or the expansion platform by a snap-fit ​​structure to realize the linkage between the adjusting arm 1 and the external components. When the adjusting arm 1 rotates around the hinge axis, the second connecting plate 14 drives the external components to rotate synchronously, forming a planar unfolding or angle adjustment action. The first connecting plate 24 and the second connecting plate 14 are respectively provided with independent connecting interfaces, so that the angle adjuster, the seat body and the external expansion parts form a modular assembly relationship, and quick disassembly and assembly can be achieved without modifying the seat body structure.

[0043] Example 2:

[0044] like Figure 7 As shown, this embodiment relates to a seat, including the angle adjuster described in Embodiment 1. Specifically, the seat includes a seat 100, a backrest 200 disposed at the rear of the seat 100, a leg 300 disposed below the seat 100, and armrest side panels 400 hinged to both sides of the seat 100; the armrest side panels 400 are connected to the side of the seat 100 via the angle adjuster, wherein the reference arm 2 of the angle adjuster is connected to the seat 100, and the adjusting arm 1 is connected to the armrest side panel 400.

[0045] The angle adjuster is a mechanical device that achieves bidirectional rotation control through a hinged structure. Specifically, it can be implemented using a linkage mechanism between a cam plate 4 and a lever. When the cam plate 4 rotates, its protrusion 41 presses against the stop block 3, disengaging it from the gear 31 and thus releasing the one-way locking. The armrest side plate 400 is a support component that can rotate around the side of the seat 100. It can be made of stamped metal sheet, with its hinged end connected to the seat 100 via a pivot, and its free end linked to the angle adjuster via the adjusting arm 1. The connection between the reference arm 2 and the seat 100 means rigidly combining the fixed part of the angle adjuster with the seat body. Specifically, it can be fixed to the side wall of the seat 100 using bolts or welding, ensuring that the reference arm 2 remains stationary during adjustment.

[0046] Specifically, the seat 100, backrest 200, and legs 300 form a basic support frame, and the armrest side panels 400 are hinged to...

[0047] The seat 100 is designed for mobility on both sides. A reference arm 2 is fixed to the side of the seat 100, and an adjusting arm 1 is connected to the armrest side plate 400. When the armrest side plate 400 rotates around its hinge point, the adjusting arm 1 activates the internal mechanism of the angle adjuster. In the normal support state, the teeth 31 of the stop block 3 engage with the arc-shaped tooth segment 11, restricting the armrest side plate 400 to rotate only in one direction. When it needs to be unfolded into a flat surface, the armrest only needs to be rotated outward in one direction. When reverse adjustment is required, the armrest needs to be adjusted outward to a flat surface. This continues to act on the armrest side plate 400, triggering the first lever 12 to rotate the cam plate 4. The protrusion 41 pushes the stop block 3 away from the teeth 31, allowing the armrest side plate 400 to rotate freely in both directions to a vertical position and reset. After resetting, the second lever 13 pushes the cam plate 4 to rotate in the opposite direction, and the stop block 3, under elastic action, re-engages the teeth 31, restoring the one-way locking. Through the above technical solution, this application solves the problem of cumbersome adjustment of traditional seat armrests. The locking state can be triggered by pushing the armrest side panel 400 with one hand. The function of the armrest is expanded, which can be used as a vertical support structure or unfolded into a horizontal storage platform. It breaks through the limitation of unidirectional adjustment and realizes bidirectional free rotation in the unlocked state to meet the needs of multiple usage scenarios.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An angle adjuster, comprising an adjusting arm (1) and a reference arm (2) hinged together, wherein the adjusting arm (1) is provided with an arc tooth segment (11) on the inner side of the hinge axis, and a stop block (3) is rotatably provided on the reference arm (2), wherein the teeth (31) on the stop block (3) elastically engage with the arc tooth segment (11); Its features are: It also includes a cam plate (4), which is coaxially disposed on the hinge axis of the adjusting arm (1) and the reference arm (2), and the outer edge of the protrusion (41) of the cam plate (4) extends radially beyond the arc tooth segment (11); The adjusting arm (1) is provided with a first lever (12) and a second lever (13) on the rotation path of the cam plate (4); in, When the teeth (31) of the stop block (3) mesh with the arc tooth segment (11), the adjusting arm (1) can only rotate in one direction relative to the reference arm (2); When the adjusting arm (1) rotates relative to the reference arm (2) and drives the first lever (12) to rotate the cam plate (4) to the point where the protrusion (41) is radially opposite to the tooth (31), the protrusion (41) presses against the tooth (31) of the stop block (3) to disengage it from the arc tooth segment (11), and the adjusting arm (1) can rotate bidirectionally relative to the reference arm (2); When the adjusting arm (1) rotates relative to the reference arm (2) and drives the second lever (13) to rotate the cam plate (4) to the radial relative position of the protrusion (41) moving out of the tooth (31), the tooth (31) of the stop block (3) re-engages with the arc tooth segment (11) under the elastic action.

2. The angle adjuster according to claim 1, characterized in that: The cam plate (4) is provided with an arc-shaped notch (42); the first lever (12) and the second lever (13) are provided on the adjusting arm (1) and extend into the arc-shaped notch (42); during the process of the adjusting arm (1) rotating clockwise or counterclockwise relative to the reference arm (2), the first lever (12) or the second lever (13) acts on the side wall of the arc-shaped notch (42) to rotate the cam plate (4).

3. Angle adjuster according to claim 1 or 2, characterized in that: A tension spring (5) is provided on the reference arm (2). One end of the tension spring (5) is fixed on the reference arm (2), and the other end is connected to the other end of the stop block (3) opposite to the tooth (31).

4. Angle adjuster according to any one of claims 1 to 3, characterized in that: The reference arm (2) includes two parallel and spaced reference side plates (21), which are connected by a first rotating shaft (22) and a second rotating shaft (23). The adjusting arm (1) and the cam plate (4) are rotatably mounted on the first rotating shaft (22) and located between the two reference side plates (21). The stop block (3) is rotatably mounted on the second rotating shaft (23) and located between the two reference side plates (21).

5. The angle adjuster of claim 4, wherein: The reference arm (2) is provided with a first connecting plate (24) on its outer end away from the hinge axis; the adjusting arm (1) is provided with a second connecting plate (14) on its outer end away from the hinge axis.

6. The angle adjuster of claim 4, wherein: The adjusting arm (1) includes two parallel and spaced adjusting side plates (10), which are connected by a first rotating shaft (22), and the cam plate (4) is located between the two adjusting side plates (10).

7. A seat, characterized by: Includes the angle adjuster as described in any one of claims 1 to 6.

8. The seat of claim 7, wherein: The chair includes a seat (100), a backrest (200) located at the rear of the seat (100), chair legs (300) located below the seat (100), and armrest side panels (400) hinged to both sides of the seat (100). The armrest side panels (400) are connected to the side of the seat (100) via an angle adjuster, wherein the reference arm (2) of the angle adjuster is connected to the seat (100), and the adjusting arm (1) is connected to the armrest side panels (400).

Images