A rotating adjustable armrest and a seat using the same.

Abstract

This invention relates to the field of handrail technology, and more particularly to an adjustable rotatable handrail structure, comprising: a mounting base with a first connecting shaft on it; a second connecting shaft with a ratchet structure on it; a handrail body with a rotating connecting part sequentially sleeved and connected to the second connecting shaft and the first connecting shaft; and a gear adjustment structure including a pawl and a reset member. When the handrail body rotates counterclockwise, it synchronously drives the pawl to move along the trajectory of the ratchet structure to achieve gear adjustment. When the reset member moves to its limit position, the pawl abuts against the side wall of the reset member, and the handrail body rotates clockwise to its initial position, synchronously driving the pawl and the reset member to reset. This invention achieves multi-gear rotation adjustment and reset functions of the handrail through fewer components and a simpler structure for manual operation. It is labor-saving, stable, and reliable, solving the problems of traditional handrail angle reset requiring external control components, complex operation, and high cost.

Description

Technical Field

[0001] This invention relates to the field of armrest technology, and more particularly to a rotary adjustable armrest and a seat using the same. Background Technology

[0002] Armrests are essential components of common home and office furniture, providing support for the upper limbs and effectively relieving fatigue from prolonged sitting, desk work, or resting. However, most existing chair armrests are fixed assembly structures, using rigid connections such as screws, adhesives, or welding to the chair frame. Once assembled, the armrest's position and angle cannot be adjusted, only providing basic support and offering poor adaptability, making it difficult to accommodate different users' sitting postures and placement needs.

[0003] Patent CN220966872U discloses an adjustable rotating armrest. It is designed with a seat connecting piece and a backrest connecting piece that are rotatably connected. It also includes a connecting shaft and a knob that rotate synchronously with the backrest connecting piece. The rotation of the knob allows for adjustment of the backrest angle. At the same time, the knob and the seat bracket clamp the armrest bracket, thus achieving the effect of clamping and supporting the armrest bracket at the angle after the angle of the armrest bracket is adjusted.

[0004] However, this technical solution requires the use of an external control knob to reset the handrail, which is complicated to operate and lacks convenience, failing to achieve a convenient and automatic reset effect. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an adjustable and rotatable handrail structure. This structure allows for manual operation of multiple rotation adjustment and reset functions of the handrail with fewer components and a simpler structure. The operation is labor-saving, stable, and reliable, solving the problems of traditional handrail angle reset requiring external control components, complex operation, and high cost.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A rotating adjustable handrail, comprising: A mounting base is provided on which a first connecting shaft is provided, and a first arc-shaped groove is provided on the first connecting shaft; The second connecting shaft is coaxially connected to the first connecting shaft and has a ratchet structure thereon. The handrail body includes a rotatable connecting portion, which is sequentially sleeved and connected to the second connecting shaft and the first connecting shaft; and The gear adjustment structure includes a pawl and a reset member. The pawl is elastically installed in the rotating connection part and engages with the ratchet structure. The reset member moves within the first arc-shaped groove. The handrail body rotates counterclockwise, which synchronously drives the pawl to move along the set trajectory of the ratchet structure to achieve gear adjustment. When the reset component moves to the limit position, the pawl abuts against the side wall of the reset component, and the handrail body rotates clockwise to the initial position, which synchronously drives the pawl and the reset component to complete the reset.

[0007] Preferably, the rotating connection part is provided with an end cover, which is placed on the second connecting shaft. The second connecting shaft is connected to the first connecting shaft by fasteners, and the gear adjustment structure is axially positioned between the mounting seat and the rotating connection part.

[0008] Preferably, when adjusting the gear, the pawl can synchronously drive the reset member to move counterclockwise, that is, the reset member moves on the left side of the pawl as the pawl moves counterclockwise.

[0009] Preferably, the second connecting shaft has a second arc-shaped groove with the same diameter as the first arc-shaped groove on its side wall. The ratchet structure is located on one side of the second arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are arranged side by side and communicate with each other along the axial direction of the first connecting shaft. The reset member is placed in the first arc-shaped groove and the second arc-shaped groove. The arc length of the second arc-shaped groove is greater than the arc length of the first arc-shaped groove. The two are aligned on the side away from the ratchet structure.

[0010] Preferably, the tooth grooves on the ratchet structure are arranged obliquely, and the pawl is provided with a first stop tooth and a second stop tooth along its length direction. The first stop tooth and the second stop tooth are simultaneously engaged in two adjacent tooth grooves on the ratchet structure.

[0011] Preferably, the outer side wall of the first stop tooth is provided with a first guide portion and a second guide portion from bottom to top; the end face of the reset member adjacent to the pawl is provided with an inclined portion.

[0012] When the reset component moves to its limit position and remains stationary, the pawl can quickly pass over the reset component and abut against its side wall. During reset, the pawl can smoothly pass over the reset component and engage with the ratchet structure, ensuring smooth operation without jamming.

[0013] Preferably, the rotating connection part is provided with a mounting groove adapted to the pawl, and an elastic element is provided in the mounting groove. The pawl is connected to the elastic element and is linearly movable in the mounting groove.

[0014] Preferably, the mounting groove is a straight groove, which makes the pawl move more smoothly, the linear movement accuracy is higher, and the operational reliability is improved.

[0015] Preferably, the elastic element is a spring, preferably a linear spring, which, combined with the guidance and positioning of the mounting groove, enables the pawl to move linearly, resulting in simple operation, fast response, and a long service life for the elastic element.

[0016] Preferably, the mounting groove is inclined so that the tips of the first and second stop teeth of the ratchet are engaged as deeply as possible in the groove of the ratchet structure, thereby achieving a stable and reliable gear lock.

[0017] Preferably, the rotating connection part is provided with a mounting hole, and an annular boss is provided inside the mounting hole. A mounting groove is formed on the outer end face of the annular boss, and the end cap is installed on the outside of the mounting groove and fits against the annular boss. Preferably, a first stop and a second stop are provided on the outer side of the first connecting shaft for limiting the rotation position of the handrail body. The inner side of the annular boss is provided with two arc-shaped rotating grooves, and the first stop and the second stop are respectively placed in the corresponding arc-shaped rotating grooves. The first connecting shaft, the second connecting shaft, and the reset member are sleeved in the annular boss.

[0018] To improve ease of reset, when resetting the handrail, the user can rotate the handrail body counterclockwise to the left limit position and then rotate it back to the right limit position to complete the quick reset of the handrail. At the same time, the rotation stroke of the handrail is limited by the second stop and the first stop respectively, which not only allows the user to quickly judge the operation stroke and operation status, but also effectively improves the accuracy and reliability of the handrail reset operation.

[0019] Preferably, the first connecting shaft has a groove at its center; the second connecting shaft also has a protruding mounting part that is fitted and connected to the groove.

[0020] Preferably, the mounting base is further provided with a sealing element, and the first connecting shaft is provided on the sealing element, which is in a tight fit with the inner end of the rotating connection and is adapted in shape.

[0021] Preferably, a hand rest is installed at the upper end of the handrail body.

[0022] Preferably, the handrail body is a height-adjustable structure.

[0023] The present invention also provides a seat using the above-mentioned armrests, including a seat body, wherein the above-mentioned rotary adjustable armrests are respectively installed on the left and right sides of the seat body, and the mounting bases are connected to the seat body by fasteners, and the armrests are adjustable by rotating back and forth relative to the seat body.

[0024] The beneficial effects of this invention are as follows: (1) The present invention has a simple and compact overall structure with high precision and flexible and convenient operation. It can achieve the multi-position rotation adjustment and reset function of the handrail by manually rotating the handrail body without external control components. It can also achieve synchronous reset of the pawl and the reset component, which can not only improve the user experience, but also be more practical and can meet the needs of different users.

[0025] (2) The present invention connects the pawl through the elastic element in the mounting groove, so that the pawl can perform linear reciprocating motion. The elastic element continuously applies force to the pawl, so that it always abuts against the ratchet structure or the reset element. The structure has a simple force form and is easy to assemble. At the same time, it can ensure the stable cooperation of the pawl and the reliable gear switching and reset action.

[0026] In summary, this invention has the advantages of simple assembly, convenient and labor-saving adjustment, simple and reliable reset without jamming, and low cost, and is suitable for use in home furnishings such as sofas and chairs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the mounting base, the first connecting shaft, and the second connecting shaft of the present invention; Figure 4 This is a schematic diagram of the mounting base, the first connecting shaft, and the second connecting shaft of the present invention; Figure 5 This is one of the schematic diagrams of the rotating connection part of the present invention; Figure 6 This is a second schematic diagram of the rotating connection part of the present invention; Figure 7 This is a schematic diagram of the overall structure of the pawl of the present invention; Figure 8 This is a schematic diagram of the initial position of the present invention; Figure 9 A schematic diagram of the manual gear adjustment state in this invention; Figure 10 One of the schematic diagrams of the handrail reset process of the present invention; Figure 11 The second schematic diagram of the handrail reset process of the present invention.

[0028] Figure Labels 1. Mounting base; 11. Seal; 2. First connecting shaft; 21. First arc-shaped groove; 22. First stop; 23. Second stop; 24. Groove; 3. Second connecting shaft; 31. Second arc-shaped groove; 32. Racket structure; 321. Tooth groove; 33. Mounting part; 4. Handrail body; 41. Rotating connection part; 411. Mounting groove; 412. Mounting hole; 4121. Annular boss; 4122. Arc-shaped rotating groove; 4123. Limiting part; 413. Elastic element; 5. End cap; 51. Pawl; 511. First stop tooth; 5111. First guide part; 5112. Second guide part; 512. Second stop tooth; 52. Reset part; 521. Inclined part; 6. End cap; 7. Decorative cover. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] Example 1 like Figures 1-11 As shown, this embodiment provides a rotary adjustable handrail, including: Mounting base 1, on which a first connecting shaft 2 is provided, and the first connecting shaft 2 is provided with a first arc-shaped groove 21; The second connecting shaft 3 is coaxially connected to the first connecting shaft 2 and is provided with a ratchet structure 32. The handrail body 4 is provided with a rotating connecting part 41, which is sequentially sleeved and connected to the second connecting shaft 3 and the first connecting shaft 2. The rotating connecting part 41 is provided with an end cover 6, which is placed on the second connecting shaft 3 and the second connecting shaft 3 is connected to the first connecting shaft 2 by fasteners. Preferably, the first connecting shaft 2 and the second connecting shaft 3 are axially limited between the handrail body and the mounting base.

[0032] The gear adjustment structure 5 includes a pawl 51 and a reset member 52. The pawl 51 is elastically installed in the rotating connection part 41 and is engaged with the ratchet structure 32. The reset member 52 is preferably disposed between the rotating connection part 41 and the first connecting shaft 2 and moves within the first arc-shaped groove 21. The armrest body 4 rotates counterclockwise, which synchronously drives the pawl 51 to move along the set trajectory of the ratchet structure 32 to achieve gear adjustment. At least when the reset member 52 moves to the limit position, the pawl 51 abuts against the side wall of the reset member 52, and the armrest body 4 rotates clockwise to the initial position, which synchronously drives the pawl 51 and the reset member 52 to complete synchronous reset.

[0033] Preferably, when adjusting the gear, the pawl 51 synchronously drives the reset member 52 to move counterclockwise, that is, the reset member 52 moves to the left of the pawl 51 as the pawl 51 moves counterclockwise.

[0034] Preferably, the pawl 51 and the ratchet structure 32 mesh with each other to achieve gear adjustment; Preferably, the first connecting shaft 2 and the second connecting shaft 3 have the same diameter. The side wall of the second connecting shaft 3 is provided with a second arc-shaped groove 31 with the same diameter as the first arc-shaped groove 21. The ratchet structure 32 is located on one side inside the second arc-shaped groove 31. The first arc-shaped groove 21 and the second arc-shaped groove 31 are arranged side by side and communicate with each other along the axial direction of the first connecting shaft 2. The arc length of the second arc-shaped groove 31 is greater than the arc length of the first arc-shaped groove 21. The two are aligned on the side away from the ratchet structure 32. The reset member 52 is placed inside the first arc-shaped groove 21 and the second arc-shaped groove 31. Specifically, the side of the second arc-shaped groove 31 close to the ratchet structure 32, that is, the outer end of the ratchet structure 32 is outside the first arc-shaped groove 21, so that when resetting, the pawl 51 moves to engage with the front end of the ratchet structure 32, and the reset member 52 is set close to the pawl 51.

[0035] For ease of processing and installation, the first arc-shaped groove 21 and the second arc-shaped groove 31 are respectively arranged to penetrate the radial direction of the corresponding connecting shaft. Of course, it can be designed as a structure where the sidewalls do not penetrate, such as opening an arc-shaped groove in the axial direction on the end face of the connecting shaft, and the reset member 52 moves in the groove.

[0036] The width of the reset member 52 is at least greater than the width of the first arc-shaped groove 21, so that the movement of the pawl 51 drives the reset member 52 to move synchronously, and the movable end of the pawl 51 can abut against the side wall of the reset member 52 during the reset operation. Preferably, the width of the reset member 52 is not less than the sum of the widths of the first arc-shaped groove 21 and the pawl 51, so that the pawl 51 can smoothly drive the reset member 52 to reset.

[0037] The thickness of the reset component 52 is adapted to the groove depth of the first arc groove 21 and the second arc groove 31 to prevent loosening or jamming, which would make the reset process unsuccessful.

[0038] Preferably, the tooth grooves 321 on the ratchet structure 32 are obliquely arranged, and the pawl 51 has a first stop tooth 511 and a second stop tooth 512 along its length direction. The first stop tooth 511 and the second stop tooth 512 simultaneously engage in two adjacent tooth grooves 321 on the ratchet structure 32. Specifically, when the armrest body 4 moves the pawl 51 to adjust the gear on the ratchet structure 32, a "click" sound will be emitted during the adjustment process, and there will be a clear sense of the gear position.

[0039] Preferably, the outer sidewall of the first stop tooth 511 is provided with a first guide portion 5111 and a second guide portion 5112 transitioning from bottom to top; the end face of the reset member 52 adjacent to the pawl 51 is provided with an inclined portion 521. Specifically, when adjusting the gear, when the reset member 52 moves to its limit position and remains stationary, it facilitates the pawl 51 to pass over the reset member 52 and abut against its sidewall; when resetting, it facilitates the pawl 51 to smoothly pass over the reset member 52 and engage with the ratchet structure 32.

[0040] Preferably, the rotating connection part 41 is provided with a mounting groove 411 that is adapted to the pawl 51, and an elastic element 413 is provided in the mounting groove 411. The pawl 51 is connected to the elastic element and is linearly movable in the mounting groove 411.

[0041] Preferably, the mounting groove 411 is a straight groove, which makes the pawl 51 move more smoothly, has higher linear movement accuracy, and improves operational reliability.

[0042] Preferably, the elastic element 413 is a spring, preferably a linear spring, which, combined with the guidance and positioning of the mounting groove 411, allows the pawl 51 to move linearly, making the action simple, the response fast, and the elastic element to have a long service life.

[0043] Preferably, the mounting groove 411 is inclined so that when the handrail body 4 loses control, the pawl 51 can automatically engage with the ratchet structure 32 under the force of the elastic element 413. At the same time, the tooth tips of the first stop tooth 511 and the second stop tooth 512 of the pawl 51 are engaged as deeply as possible in the tooth groove 321 on the ratchet structure 32, so as to achieve a stable and reliable gear lock.

[0044] The two ends of the elastic element 413 are respectively connected to the pawl 51 and the rotating connection part 41. The linear elastic force provided by the elastic element ensures that the pawl 51 always abuts against the ratchet structure 32 or the reset element 52. This structure has a simple force form and is easy to assemble. At the same time, it can ensure stable pawl engagement and reliable gear switching and reset actions. During the manual rotation of the handrail body 4, the operation is more labor-saving.

[0045] Preferably, the rotating connection part 41 is provided with a mounting hole 412, and an annular boss 4121 is provided inside the mounting hole 412. The mounting groove 411 is opened on the outer end face of the annular boss 4121 and extends into the inside of the handrail body 4. The end cover 6 is installed on the outside of the mounting groove 411 and fits against the annular boss 4121.

[0046] Preferably, the outer side of the first connecting shaft 2 is provided with a first stop 22 and a second stop 23 for limiting the rotation position of the handrail body 4. The inner side of the annular boss 4121 is provided with two arc-shaped rotation grooves 4122. The first stop 22 and the second stop 23 are respectively placed in the corresponding arc-shaped rotation grooves 4122. The first connecting shaft 2, the second connecting shaft 3 and the reset member 52 are sleeved in the annular boss 4121.

[0047] The first stop 22 and the second stop 23 limit the rotational limit position of the handrail body 4. The inner side of the annular boss 4121 is provided with two limiting parts 4123 at intervals, and two symmetrically arranged arc-shaped rotation grooves 4122 are formed between the two limiting parts 4123.

[0048] Preferably, the first connecting shaft 2 has a groove 24 at its center; the second connecting shaft 3 also has a mounting part 33 that is sleeved and connected to the groove 24. The groove 24 and the mounting part 33 are preferably processed into irregular shapes, such as the square structure shown in the figure, to achieve stable assembly between the first connecting shaft 2 and the second connecting shaft 3.

[0049] Preferably, the groove 24, the mounting part 33, and the end cover 6 are provided with two positioning holes, and the first connecting shaft 2, the second connecting shaft 3, and the end cover 6 are assembled and positioned by means of a matching fastener, so as to ensure that the above components do not rotate relative to each other, making the adjustment process of the handrail safer and more reliable.

[0050] Specifically, fasteners are sequentially inserted through the end cap 6, the groove 24 and the mounting part 33 to seal the gear adjustment structure between the rotating connection part 41 of the handrail body 4 and the mounting seat 1, and to limit the axial movement.

[0051] Preferably, the mounting base 1 is further provided with a sealing element 11, and the first connecting shaft 2 is provided on the sealing element 11, which is in a tight fit with the inner end of the rotating connecting part 41 and is adapted in shape.

[0052] The specific operation for rotating and resetting the armrest body 4 is as follows: When in the initial position, the gear adjustment mechanism is as follows: Figure 8 As shown, specifically, at this time, the first stop tooth 511 and the second stop tooth 512 of the pawl 51 along its length direction are engaged with the two tooth grooves at the front end of the ratchet structure. At this time, the reset member 52 is located on the left side of the pawl 51 and is movably placed in the first arc-shaped groove 21.

[0053] When adjusting the gear, such as Figure 8-9 As shown, specifically, during the counterclockwise rotation of the armrest body 4, the first stop tooth 511 and the second stop tooth 512 of the pawl 51 can engage with two adjacent tooth grooves 321 at different positions on the ratchet structure 32. The armrest body 4 can stop at different rotation positions, giving the armrest multiple adjustment levels and a clear sense of each level. During this process, the reset member 52 can also move along with the pawl 51. like Figures 10-11 As shown, when the reset member 52 moves to its limit position and stops, that is, when it moves to the leftmost side of the first arc groove 21, the operating armrest body 4 drives the pawl 51 to pass over the reset member 52. The pawl 51 is subjected to force by the elastic member 413 so that it abuts against the reset member 52. At this time, the operating armrest body 4 can be rotated to synchronously drive the pawl 51 and the reset member 52 to rotate back to the initial position. Since the reset member 52 is restricted by the right end of the first arc groove 21, it stops to reset. The pawl 51 passes over the right end of the reset member 52 and continues to rotate until its first stop tooth 511 and second stop tooth 512 are engaged by the elastic member 413 with the pressure of the two tooth grooves 321 at the front end of the ratchet structure to complete the reset.

[0054] Preferably, to improve the ease of reset, when resetting the handrail, the user can operate the handrail body 4 to rotate counterclockwise to the left limit position and then rotate it back to the right limit position to complete the quick reset of the handrail; at the same time, the rotation stroke of the handrail is limited by the second stop 23 and the first stop 22 respectively, which can not only allow the user to quickly judge the operation stroke and operation status, but also effectively improve the accuracy and reliability of the handrail reset operation.

[0055] Specifically, when the armrest body 4 rotates to the point where it is blocked by the second stop 23, the pawl 51 is pushed to the farthest end of the reset member 52, and then rotates clockwise to reset the pawl 51. Figure 10 As shown; the pawl 51 can also abut against the nearest end of the reset member 52, thereby driving the pawl 51 to reset clockwise to the initial position, as shown. Figure 11 As shown, it can adapt to the needs of different users.

[0056] Preferably, a handrest is installed at the upper end of the handrail body, which is a conventional design and will not be described in detail.

[0057] Preferably, the handrail body can be a lifting structure, which is a conventional design choice and will not be described in detail.

[0058] Preferably, the rotating connection part 41 is also provided with a decorative cover 7, which not only achieves sealing and waterproofing, but also hides the end cover 6, connecting shaft, and gear adjustment structure 5 between the decorative cover 7 and the mounting base 1, thus improving the aesthetics.

[0059] Example 2 This embodiment provides a seating fixture, including a seating body. A type of rotatable adjustable armrest, as described in the above embodiment, is installed on the left and right sides of the seating body. The mounting base 1 is connected to the seating body by fasteners, and the armrests can be rotated and adjusted relative to the seating body.

[0060] The seating includes sofas, chairs, etc., which are adapted to install rotating and adjustable armrests. When in use, users can flexibly adjust the armrests according to their arm placement needs. The adjustment operation is simple and effortless, the user experience is comfortable, and the design is more user-friendly.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary adjustable handrail, characterized in that, include: A mounting base is provided with a first connecting shaft, and the first connecting shaft is provided with a first arc-shaped groove. The second connecting shaft is coaxially connected to the first connecting shaft and has a ratchet structure thereon. The handrail body includes a rotating connecting portion that is sequentially sleeved and connected to a second connecting shaft and a first connecting shaft. An end cap is provided inside the rotating connecting portion and is fitted onto the second connecting shaft. Fasteners are used to connect the first connecting shaft and the second connecting shaft. The gear adjustment structure includes a pawl and a reset member. The pawl is elastically installed in the rotating connection part and engages with the ratchet structure. The reset member moves within the first arc-shaped groove. The handrail body rotates counterclockwise, which synchronously drives the pawl to move along the set trajectory of the ratchet structure to achieve gear adjustment. When the reset component moves to the limit position, the pawl abuts against the side wall of the reset component, and the handrail body rotates clockwise to the initial position, which synchronously drives the pawl and the reset component to complete the reset.

2. The rotary adjustable handrail according to claim 1, characterized in that, The second connecting shaft has a second arc-shaped groove with the same diameter as the first arc-shaped groove on its side wall. The ratchet structure is located on one side of the second arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are arranged side by side and communicate with each other along the axial direction of the first connecting shaft. The reset member is placed in the first arc-shaped groove and the second arc-shaped groove. The arc length of the second arc-shaped groove is greater than the arc length of the first arc-shaped groove. The two are aligned on the side away from the ratchet structure.

3. A rotary adjustable handrail according to claim 2, characterized in that, The tooth grooves on the ratchet structure are arranged obliquely, and the pawl is provided with a first stop tooth and a second stop tooth along its length direction. The first stop tooth and the second stop tooth are simultaneously engaged in two adjacent tooth grooves on the ratchet structure.

4. A rotary adjustable handrail according to claim 3, characterized in that, The outer side wall of the first stop tooth is provided with a first guide portion and a second guide portion from bottom to top; the end face of the reset member adjacent to the pawl is provided with an inclined portion.

5. A rotary adjustable handrail according to any one of claims 1-4, characterized in that, The rotating connection part is provided with a mounting groove that matches the pawl. An elastic element is provided in the mounting groove. The pawl is connected to the elastic element and is linearly movable in the mounting groove.

6. A rotary adjustable handrail according to claim 5, characterized in that, The rotating connection part is provided with a mounting hole, and an annular boss is provided inside the mounting hole. A mounting groove is opened on the outer end face of the annular boss. The end cap is installed on the outside of the mounting groove and fits against the annular boss.

7. A rotary adjustable handrail according to claim 6, characterized in that, The outer side of the first connecting shaft is provided with a first stop and a second stop for limiting the rotation position of the handrail body. The inner side of the annular boss is provided with two arc-shaped rotation grooves. The first stop and the second stop are respectively placed in the corresponding arc-shaped rotation grooves. The first connecting shaft, the second connecting shaft and the reset member are sleeved in the annular boss.

8. A rotary adjustable handrail according to any one of claims 1-4, characterized in that, The first connecting shaft has a groove at its center; the second connecting shaft also has a protruding mounting part that is fitted and connected to the groove.

9. A rotary adjustable handrail according to any one of claims 1-4, characterized in that, The mounting base is also provided with a sealing element, and the first connecting shaft is provided on the sealing element, which is in a tight fit with the inner end of the rotating connection part and is adapted in shape.

10. A seating arrangement, comprising a seating body, characterized in that, The left and right sides of the seat body are respectively equipped with a rotary adjustable armrest as described in any one of claims 1-9. The mounting base is connected to the seat body by fasteners, and the armrest can be rotated and adjusted relative to the seat body.

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