Armrest assembly with built-in limiting mechanism

Abstract

The present disclosure relates to an armrest assembly with a built-in limiting mechanism, comprising: an armrest bracket formed or fixed on a seat assembly, the armrest bracket comprising two hinge portions spaced apart from each other, wherein a shaft member is fixed to each hinge portion; an armrest frame located between the two hinge portions, wherein the two opposite sides of the armrest frame are respectively rotatably connected to the corresponding shaft members, and at least one side is rotatably connected to the corresponding shaft member by means of an angle adjuster; and a limiting mechanism, provided on at least one side of the armrest frame, and comprising a fixed blocking member fixed to a corresponding shaft member and a movable blocking member fixed to the armrest frame, wherein when the armrest frame rotates to a designed opening position, the movable blocking member is in contact with the fixed blocking member and is blocked and limited by the fixed blocking member. In the present disclosure, by arranging the limiting mechanism between an armrest outer cover and the armrest frame, the external space of the hinge portions is not occupied, so that the requirement for the thickness of the armrest outer cover can be greatly reduced, and the present disclosure is suitable for occasions having a high requirement for the size of the armrest assembly.

Description

A handrail assembly with a built-in limiting mechanism Technical Field

[0001] This disclosure relates to the field of automotive seat technology, and in particular to an armrest assembly with a built-in limiting mechanism. Background Technology

[0002] Currently, there are two main types of armrests for rear seats: The first is the 20% armrest 2, as shown in Figure 1(a). This 20% armrest 2 is completely independent of the two rear seats 1. When opened, the backrests of the two rear seats 1 are completely separated, and both rear seats 1 and the 20% armrest 2 can move independently. This design allows the 20% armrest 2 to have sufficient thickness to accommodate an adjuster for self-locking. The second type is the 46-point armrest 20, as shown in Figure 2. When opened, the 46-point armrest 20 is connected to the backrest frame 11 between the two rear seats 1. This design limits the thickness of the 46-point armrest 20, so it is usually impossible to accommodate an adjuster and it lacks a self-locking function. When the 46-point armrest 20 is flipped to its designed open position, it is supported by the headrest at the top. However, in the event of a collision, the 46-point armrest 20, lacking a self-locking function, may accidentally open. Therefore, more and more customers are requesting that the 46-point armrest 20 also have a self-locking function.

[0003] Armrests with adjustable angle mechanisms are usually also equipped with limiting mechanisms. The adjustable angle mechanism allows the armrest to rotate relative to the seat, while the limiting mechanism prevents the armrest from rotating further when it reaches the designed open position, thus limiting the armrest's movement.

[0004] As shown in Figures 1(b) and 1(c), the current limiting mechanism includes a movable limiting member 21 and a fixed limiting member 22. The movable limiting member 21 is usually set on the armrest frame, while the fixed limiting member 22 is set on the armrest bracket fixedly connected to the seat assembly. When the armrest frame rotates relative to the armrest bracket, the movable limiting member 21 rotates with the armrest frame. When the armrest frame rotates to the designed open position, the movable limiting member 21 contacts the fixed limiting member 22 and is blocked and limited by the fixed limiting member 22, thereby limiting the armrest frame. For aesthetic purposes, the armrest bracket cover 23 should cover the fixed limiting member 22 on the armrest bracket. According to the requirements of relevant standards, the armrest cover 24 (usually composed of an armrest plastic shell, foam, and cover) should not only cover the movable limiting member 21 on the armrest frame, but also cover the armrest bracket cover 23 so that the armrest bracket part can be completely covered when viewed from the side. Therefore, for a limiting mechanism where the fixed limiting member 22 is mounted on the handrail bracket, a larger handrail bracket cover 23 is required, which in turn requires an even larger handrail cover 24. This makes it impossible to install the existing external limiting mechanism on a 46-point handrail with an angle adjuster.

[0005] Public content

[0006] To address the aforementioned issues, this disclosure provides a handrail assembly with a built-in limiting mechanism. By placing the limiting mechanism between the handrail cover and the handrail frame, it eliminates the need to occupy the external space of the hinge, thereby significantly reducing the thickness requirements of the handrail cover. This makes it suitable for applications with stringent size requirements for the handrail assembly.

[0007] This disclosure is achieved through the following solution: a handrail assembly with a built-in limiting mechanism, comprising:

[0008] An armrest bracket formed on or fixed to a seat assembly, the armrest bracket including two spaced-apart hinges, each hinge having a fixed shaft;

[0009] An armrest frame is located between two hinged portions, and the opposite sides of the armrest frame are rotatably connected to the corresponding shafts. At least one side of the opposite sides of the armrest frame is rotatably connected to the corresponding shaft via an angle adjuster to drive the armrest frame to rotate about the shaft relative to the armrest support.

[0010] A limiting mechanism is provided on at least one side of the handrail frame and includes a fixed stop fixed to the corresponding side shaft and a movable stop fixed to the handrail frame. When the handrail frame rotates relative to the handrail bracket to the designed open position, the movable stop contacts the fixed stop and is blocked and limited by the fixed stop.

[0011] A further improvement of the handrail assembly with built-in limiting mechanism disclosed herein is that one side of the handrail frame is rotatably connected to the shaft on one side via an angle adjuster, and the other side of the handrail frame is rotatably connected to the shaft on the other side via an adapter sleeve fixedly connected to the handrail frame.

[0012] A further improvement of the handrail assembly with built-in limiting mechanism disclosed herein is that the number of limiting mechanisms is one, and it is disposed on the same side of the handrail frame as the angle adjuster.

[0013] A further improvement of the handrail assembly with built-in limiting mechanism disclosed herein is that the number of limiting mechanisms is one, and it is disposed on the same side of the handrail frame as the adapter sleeve.

[0014] A further improvement of the handrail assembly with built-in limiting mechanisms disclosed herein is that the number of limiting mechanisms is two, and they are respectively arranged on the same side of the handrail frame as the angle adjuster and the adapter sleeve.

[0015] A further improvement of the handrail assembly with built-in limiting mechanism disclosed herein is that the opposite sides of the handrail frame are rotatably connected to the corresponding shaft via an angle adjuster.

[0016] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the number of the limiting mechanism is one, and it is disposed on the same side of the armrest frame as the angle adjuster on either side.

[0017] A further improvement of the handrail assembly with built-in limiting mechanisms disclosed herein is that the number of limiting mechanisms is two, and they are respectively arranged on the same side of the handrail frame as the angle adjusters on both sides.

[0018] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the angle adjuster includes a fixed plate fixed to the shaft on the corresponding side, and a rotating plate rotatably connected to the fixed plate. The rotating plate is fixed to the corresponding side of the armrest frame. The fixed stop of the limiting mechanism, which is provided on the same side as the angle adjuster, is fixed to the shaft on the corresponding side or to the fixed plate, and the movable stop is fixed to the rotating plate or to the armrest frame.

[0019] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that a lotus root slice for fixing to the fixed plate is fixed on the shaft, the lotus root slice is adapted to the shape of the fixed plate, and the fixed stop is formed at the edge of the lotus root slice and extends to the rotation path of the movable stop.

[0020] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the shaft is provided with an irregularly shaped end that is adapted to the irregularly shaped hole on the hinge portion and / or the lotus root slice.

[0021] A further improvement of the handrail assembly with built-in limiting mechanism disclosed herein is that one end of the movable stop is fixed to the handrail frame at a position around the rotating disk, and the other end extends beyond the surface of the lotus root slice in a direction away from the handrail frame.

[0022] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the movable stop is an arc-shaped piece.

[0023] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the fixed stop of the limiting mechanism, which is provided on the same side as the adapter sleeve, includes a fixed protrusion, which is fixed on the shaft on the corresponding side and extends outward along the radial direction of the shaft. The movable stop includes a movable protrusion, which is fixed on the inner circumferential surface of the adapter sleeve and extends inward along the radial direction of the adapter sleeve.

[0024] A further improvement of the armrest assembly with built-in limiting mechanism disclosed herein is that the number of fixed protrusions is two and they are arranged opposite each other in the radial direction of the shaft, and the number of movable protrusions is two and they are arranged opposite each other in the radial direction of the adapter sleeve.

[0025] This disclosure, by placing the limiting mechanism between the handrail cover and the handrail frame, eliminates the need to occupy the external space of the hinge, significantly reducing the thickness requirement of the handrail cover. This makes it suitable for applications with strict requirements on the overall handrail dimensions, such as 46-point handrails. Furthermore, this disclosure provides two types of limiting mechanisms: one that can be located on the angle adjuster side, and the other that can be located on the non-angle adjuster side, providing limiting functionality for different handrail structures. Attached Figure Description

[0026] Figure 1(a) shows a schematic diagram of the open and closed state of the 20% armrest on the rear seat.

[0027] Figure 1(b) shows a schematic diagram of the layout of movable and fixed limiting components in an existing limiting mechanism.

[0028] Figure 1(c) shows a schematic diagram of the thickness dimensions of the armrest cover with the limiting mechanism shown in Figure 1(b).

[0029] Figure 2 shows a schematic diagram of the open and closed state of the 46-point armrest on the rear seat.

[0030] Figure 3 shows an exploded view of the handrail frame, limiting mechanism, and handrail support in the first embodiment of this disclosure.

[0031] Figure 4 shows an assembly diagram of the handrail frame, limiting mechanism and handrail bracket in the first embodiment of this disclosure.

[0032] Figure 5 shows an exploded view of the armrest frame and limiting mechanism in the first embodiment of this disclosure.

[0033] Figure 6 shows an assembly diagram of the handrail frame and the limiting mechanism in the first embodiment of this disclosure.

[0034] Figure 7 shows an exploded view of the angle adjuster and corresponding limiting mechanism of this disclosure.

[0035] Figure 8 shows a schematic diagram of the working principle of the limit mechanism in the closed state according to the first embodiment of this disclosure.

[0036] Figure 9 shows a schematic diagram of the working principle of the limiting mechanism in the partially open state according to the first embodiment of this disclosure.

[0037] Figure 10 shows a schematic diagram of the working principle of the limit mechanism in the fully open state according to the first embodiment of this disclosure.

[0038] Figure 11 shows an exploded view of the armrest frame and limiting mechanism in the second embodiment of this disclosure.

[0039] Figure 12 shows an exploded view of the armrest frame and limiting mechanism in the third embodiment of this disclosure.

[0040] Figure 13 shows an exploded view of the armrest frame and limiting mechanism in the fourth embodiment of this disclosure.

[0041] Figure 14 shows an exploded view of the armrest frame and limiting mechanism in the fifth embodiment of this disclosure.

[0042] Figure 15 shows an exploded view of the armrest frame and limiting mechanism in the sixth embodiment of this disclosure.

[0043] Figure 16 shows an exploded view of the armrest frame and limiting mechanism in the seventh embodiment of this disclosure.

[0044] Figure 17 shows a schematic diagram of the thickness dimensions of the handrail cover of this disclosure.

[0045] In the diagram: 1. Seat; 11. Backrest frame; 2. 20% armrest; 20. 46-point armrest; 21. Movable limiter; 22. Fixed limiter; 23. Armrest bracket cover; 24. Armrest cover; 31. First hinge; 311. First shaft hole; 32. Second hinge; 321. Second shaft hole; 33. First shaft; 331. First irregular end; 332. Third irregular end; 34. Second shaft; 341. Second irregular end; 35. Lotus root slice; 351. Third shaft hole; 4. Armrest frame; 4 1. First side plate; 411. First mounting hole; 42. Second side plate; 421. Second mounting hole; 43. Slot; 5. Angle adjuster; 51. Fixed plate; 52. Rotating plate; 6. Adapter sleeve; 61. Bushing; 7. First limiting mechanism; 71. First fixed stop; 72. First movable stop; 8. Second limiting mechanism; 81. Second fixed stop; 81a. First fixed protrusion; 81b. Second fixed protrusion; 82. Second movable stop; 82a. First movable protrusion; 82b. Second movable protrusion. Detailed Implementation

[0046] Traditional limiting mechanisms occupy a large amount of space, making them unsuitable for applications with strict requirements on the dimensions of the handrail assembly. Therefore, this disclosure provides a handrail assembly with a built-in limiting mechanism. By placing the limiting mechanism between the handrail cover and the handrail frame, it eliminates the need to occupy external space at the hinge, significantly reducing the thickness requirements of the handrail cover and making it suitable for applications with strict requirements on the dimensions of the handrail assembly. The following detailed description, in conjunction with the accompanying drawings, further illustrates this handrail assembly with a built-in limiting mechanism.

[0047] Referring to Figures 3 to 7, an armrest assembly with a built-in limiting mechanism includes an armrest bracket, an armrest frame 4, and a limiting mechanism. The armrest bracket is formed on or fixed to the seat assembly. The armrest bracket includes a first hinge portion 31 and a second hinge portion 32 spaced apart. A first shaft member 33 and a second shaft member 34 are respectively fixed to the first hinge portion 31 and the second hinge portion 32. The first shaft member 33 and the second shaft member 34 extend inwardly relative to each other along the same axis L. The first hinge portion 31 has a first shaft hole 311 for inserting and fixing the first shaft member 33, and the second hinge portion 32 has a second shaft hole 321 for inserting and fixing the second shaft member 34. It is understood that the first shaft member 33 can also be pre-integrated with the first hinge portion 31 as a single unit, and the second shaft member 34 can also be pre-integrated with the second hinge portion 32 as a single unit. Preferably, in order to ensure reliable fixation between the shaft and the hinge, the end of the first shaft 33 that is fixed to the first hinge 31 is formed as a first irregular end 331, and correspondingly, the first shaft hole 311 is an irregular hole adapted to the first irregular end 331. The end of the second shaft 34 that is fixed to the second hinge 32 is formed as a second irregular end 341, and correspondingly, the second shaft hole 321 is an irregular hole adapted to the second irregular end 341.

[0048] The handrail frame 4 is located between the first hinge portion 31 and the second hinge portion 32. The handrail frame 4 includes a first side plate 41 and a second side plate 42. The first side plate 41 is rotatably connected to the first shaft member 33, and the second side plate 42 is rotatably connected to the second shaft member 34. An angle adjuster 5 (see Figures 12 and 13) is installed on the first side plate 41 and / or the second side plate 42. The angle adjuster 5 is rotatably connected to the first shaft member 33 and / or the second shaft member 34 to drive the handrail frame 4 to rotate about the axis L relative to the handrail bracket 3.

[0049] The limiting mechanism is located between the first side plate 41 and the first hinge portion 31, and / or between the second side plate 42 and the second hinge portion 32. It includes a fixed stop fixed to the first shaft 33 and / or the second shaft 34, and a movable stop fixed to the first side plate 41 and / or the second side plate 42. When the handrail frame 4 rotates relative to the handrail bracket to the designed open position (i.e., the state shown in the right figure in Figures 1 and 2), the movable stop contacts the fixed stop and is blocked and limited by the fixed stop.

[0050] The setting of this limiting mechanism is illustrated through the following examples:

[0051] In the first embodiment, as shown in Figures 3 to 7, an angle adjuster 5 is installed on the first side plate 41, and the first side plate 41 and the first shaft member 33 are rotatably connected through the angle adjuster 5. Specifically, as shown in Figure 7, the angle adjuster 5 includes a fixed disk 51 and a rotating disk 52 rotatably connected to the fixed disk 51. The rotating disk 52 is fixed on the first side plate 41. A lotus root slice 35 adapted to the shape of the fixed disk 51 is fixed on the first shaft member 33. The lotus root slice 35 is mated and fixed to the fixed disk 51, thereby realizing the fixed connection between the fixed disk 51 and the first shaft member 33. The lotus root slice 35 has a third shaft hole 351 for the first shaft member 33 to be inserted and fixed. By setting the lotus root slice 35, the fixing area between the first shaft member 33 and the fixed disk 51 is increased, so that the two can be reliably fixed. Preferably, one end of the first shaft member 33 inserted into the third shaft hole 351 is formed as a third irregular end 332, and correspondingly, the third shaft hole 351 is an irregular hole adapted to the third irregular end 332. Through the above connection structure, the first side plate 41 and the first shaft member 33 are rotatably connected, and the rotation of the rotating disk 52 in the angle adjuster 5 relative to the fixed disk 51 can drive the rotation of the handrail frame 4 relative to the handrail bracket. The second side plate 42 is fixed with an adapter sleeve 6, and the second shaft member 34 is rotatably inserted into the adapter sleeve 6. When the angle adjuster 5 drives the handrail frame 4 to rotate relative to each other, the second side plate 42 rotates relative to the second shaft member 34.

[0052] In this embodiment, there are two limiting mechanisms, including a first limiting mechanism 7 disposed on the same side as the angle adjuster 5 and a second limiting mechanism 8 disposed on the same side as the adapter sleeve 6. In this specification, "disposed on the same side" is understood to mean disposed on the same side of the handrail frame 4 in the direction of axis L. As shown in Figures 3 to 7, the first limiting mechanism 7 includes a first fixed stop 71 and a first movable stop 72. The first movable stop 72 is fixed on the first side plate 41. A slot 43 is provided on the first side plate 41 at the periphery of the rotating disk 52. The first movable stop 72 is an arc-shaped piece, with one end inserted into and fixed in the slot 43, and the other end extending away from the first side plate 41 and extending beyond the surface of the lotus root slice 35 in the direction of axis L. When the handrail frame 4 rotates, the first movable stop 72 will rotate around the periphery of the fixed disk 51 and the lotus root slice 35 around axis L. The first fixed stop 71 is formed at the edge of the lotus root slice 35 and extends radially perpendicular to the axis L to the rotation path of the first movable stop 72. It is conceivable that the first fixed stop 71 can also be arranged on the fixed plate 51 of the angle adjuster 5, or the first movable stop 72 can also be arranged on the rotating plate 52 of the angle adjuster 5.

[0053] As shown in Figures 3 to 5, the second limiting mechanism 8 includes a second fixed stop 81 and a second movable stop 82. The second fixed stop 81 includes a fixed protrusion fixed to the outer circumferential surface of the second shaft 34 and extending radially outward. The second movable stop 82 includes a movable protrusion fixed to the inner circumferential surface of the adapter sleeve 6 and extending radially inward. In this embodiment, there are two fixed protrusions, which are fixed at intervals to the outer circumferential surface of the second shaft 34 and preferably arranged opposite to each other in the radial direction of the second shaft 34. The positions of the two fixed protrusions determine the closed position and the designed open position of the armrest frame. There are also two movable protrusions, which are fixed at intervals to the inner circumferential surface of the adapter sleeve 6 and preferably arranged opposite to each other in the radial direction of the adapter sleeve 6. It is conceivable that the number of movable protrusions could also be one.

[0054] The working principles of the first limiting mechanism 7 and the second limiting mechanism 8 are shown in Figures 8 to 10:

[0055] When the armrest frame 4 is in the closed state, as shown in Figure 8(a), the angle adjuster 5 is in a self-locking state. At this time, the state of the first limiting mechanism 7 is shown in Figure 8(b), with the first fixed stop 71 on top and the first movable stop 72 on the bottom, and the first fixed stop 71 and the first movable stop 72 are in a distanced state. The state of the second limiting mechanism 8 is shown in Figure 8(c), with the two fixed protrusions in the second fixed stop 81 being the first fixed protrusion 81a and the second fixed protrusion 81b, and the two movable protrusions in the second movable stop 82 being the first movable protrusion 82a and the second movable protrusion 82b. When the armrest frame 4 is in the closed state, the first fixed protrusion 81a is on top and the second fixed protrusion 81b is on the bottom, the first movable protrusion 82a is on top and the second movable protrusion 82b is on the bottom. Furthermore, the front side of the first fixed protrusion 81a in the clockwise direction contacts the rear side of the first movable protrusion 82a, and the front side of the second fixed protrusion 81b in the clockwise direction contacts the rear side of the second movable protrusion 82b.

[0056] When the angle adjuster 5 is unlocked, the first side plate 41 will rotate clockwise relative to the first hinge 31 along with the rotating disk 52 of the angle adjuster 5 (as shown in Figure 7). That is, the armrest frame 4 begins to rotate clockwise relative to the armrest support. Since the fixed stop is fixed relative to the armrest support and the movable stop is fixed relative to the armrest frame 4, the fixed stop remains stationary while the movable stop rotates with the armrest frame 4. Specifically, as shown in Figure 9(a), when the armrest frame 4 rotates to the partially open state, the state of the first limiting mechanism 7 is shown in Figure 9(b). The first fixed stop 71 remains on top, while the first movable stop 72 swings clockwise at a certain angle, and the distance between it and the first fixed stop 71 is reduced. The state of the second limiting mechanism 8 is shown in Figure 9(c). The first fixed protrusion 81a remains on top, the second fixed protrusion 81b remains on the bottom, and the first movable protrusion 82a and the second movable protrusion 82b have rotated clockwise by a certain angle. The first movable protrusion 82a and the second movable protrusion 82b are respectively located between the two sides of the first fixed protrusion 81a and the second fixed protrusion 82b.

[0057] When the armrest frame 4 is rotated to the fully open state, as shown in Figure 10(a), the state of the first limiting mechanism 7 is as shown in Figure 10(b). The first fixed stop 71 remains on top, while the first movable stop 72 continues to rotate clockwise by a certain angle and comes into contact with the first fixed stop 71, thus being blocked and limited by the first fixed stop 71 to prevent the first side plate 41 from continuing to rotate. The state of the second limiting mechanism 8 is as shown in Figure 10(c). The first fixed protrusion 81a remains on top, the second fixed protrusion 81b remains on the bottom, while the first movable protrusion 82a and the second movable protrusion 82b continue to rotate clockwise by a certain angle. The front side of the first movable protrusion 82a in the clockwise direction comes into contact with the rear side of the second fixed protrusion 81b, thus being blocked and limited by the second fixed protrusion 81b. Simultaneously, the front side of the second movable protrusion 82b, moving clockwise, contacts the rear side of the first fixed protrusion 81a and is blocked and limited by the first fixed protrusion 81a. By blocking and limiting the second movable stop 82 by the second fixed stop 81, the second side plate 42 can be prevented from continuing to rotate.

[0058] The first limiting mechanism 7 and the second limiting mechanism 8 work together to limit the handrail frame 4, ensuring that the handrail frame 4 can stop smoothly in the fully open state. Moreover, the double protruding limiting structure in the second limiting mechanism 8 can achieve two limiting functions: on the one hand, it can prevent the handrail frame 4 from tipping backward when it is in the closed state; on the other hand, it can prevent the handrail frame 4 from tilting forward when it is in the fully open state.

[0059] The second embodiment, as shown in Figure 11, differs from the first embodiment in that it includes only one limiting mechanism, which is located on the same side as the angle adjuster 5, i.e., only the aforementioned first limiting mechanism 7. The specific structure and working principle of this first limiting mechanism 7 are the same as in the first embodiment and will not be elaborated upon here.

[0060] The third embodiment, as shown in Figure 12, differs from the first embodiment in that it includes only one limiting mechanism, which is located on the same side as the adapter sleeve 6, i.e., only the aforementioned second limiting mechanism 8. The specific structure and working principle of this second limiting mechanism 8 are the same as in the first embodiment and will not be elaborated upon here.

[0061] The fourth embodiment, as shown in Figure 13, differs from the first embodiment in that both the first side plate 41 and the second side plate 42 are equipped with angle adjusters 5, which respectively enable the rotatable connection between the first side plate 41 and the first shaft member 33, and the rotatable connection between the second side plate 42 and the first shaft member 33. Two limiting mechanisms are used, and each limiting mechanism is located on the same side as the angle adjusters 5 on both sides. The structure and working principle of the two limiting mechanisms are the same as the first limiting mechanism 7 in the first embodiment, and will not be described in detail here.

[0062] The fifth embodiment, as shown in Figure 14, differs from the fourth embodiment in that only one limiting mechanism is used, and it is positioned on the same side as the angle adjuster 5 on either side, achieving only unilateral limiting. The installation of the two angle adjusters 5 is the same as in the fourth embodiment, and the structure and working principle of this unilateral limiting mechanism are the same as the first limiting mechanism 7 in the fourth embodiment, which will not be described in detail here.

[0063] The sixth and seventh embodiments are shown in Figures 15 and 16, respectively. As can be seen from the figures, the first limiting mechanism 7 and the second limiting mechanism 8 described above can cooperate with handrail frames 4 of different structural forms. The handrail frame 4 only needs to have a first mounting hole 411 for installing the angle adjuster 5 and a second mounting hole 421 for installing the adapter sleeve 6. Of course, the sixth and seventh embodiments can also be modified based on the second to fifth embodiments.

[0064] This disclosure, by placing the limiting mechanism between the handrail cover and the handrail frame, eliminates the need to occupy the space of the hinge, significantly reducing the thickness requirement of the handrail cover. This makes it suitable for applications with high requirements for the size of the handrail assembly, such as 46-point handrails. Specifically, compare Figures 1(c) and 17. Figure 1(c) shows a 20% handrail with the limiting mechanism shown in Figure 1(b), and Figure 17 shows the handrail assembly with the built-in limiting mechanism of this disclosure. As can be seen from Figure 1(c), when the handrail is in the closed position, the distance from the outer contour of the handrail support cover 23 to the rotation center O of the handrail is H2, and the thickness of the handrail cover 24 is L2. In this design, the fixed limiting member 22 (as shown in Figures 1(b) and 4) located on the handrail support in the 20% handrail is moved inward (e.g., via a lotus root piece 35) to between the handrail cover 24 and the handrail frame 4. Compared to the external limiting mechanism design in Figure 1(b), the handrail bracket in this scheme only needs to be connected to the shaft. Therefore, the distance H1 from the outer contour of the handrail bracket cover 23 to the rotation center O of the handrail is smaller, and the thickness L1 of the handrail cover can also be reduced accordingly. That is, H2>H1, L2>L1. Therefore, the design of the built-in limiting mechanism in this scheme can meet the limitation of the relatively small thickness of the 46-point handrail. In addition, this disclosure provides two types of limiting mechanisms, which can be selectively set as needed, making it flexible and widely applicable.

[0065] The present disclosure has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present disclosure based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present disclosure, and the scope of the present disclosure shall be defined by the appended claims.

Claims

1. A handrail assembly with a built-in limiting mechanism, characterized in that, include: An armrest bracket formed or fixed to a seat assembly, the armrest bracket including two spaced-apart hinges, each hinge having a fixed shaft; An armrest frame is located between two hinged portions, and the opposite sides of the armrest frame are rotatably connected to the corresponding shafts. At least one side of the opposite sides of the armrest frame is rotatably connected to the corresponding shaft via an angle adjuster to drive the armrest frame to rotate about the shaft relative to the armrest support. A limiting mechanism is provided on at least one side of the handrail frame and includes a fixed stop fixed to the shaft on the corresponding side and a movable stop fixed to the handrail frame. When the handrail frame rotates relative to the handrail bracket to the designed open position, the movable stop contacts the fixed stop and is blocked and limited by the fixed stop.

2. The handrail assembly with a built-in limiting mechanism as described in claim 1, characterized in that, One side of the handrail frame is rotatably connected to the shaft on one side via an angle adjuster, and the other side of the handrail frame is rotatably connected to the shaft on the other side via an adapter sleeve fixedly connected to the handrail frame.

3. The handrail assembly with a built-in limiting mechanism as described in claim 2, characterized in that, The limiting mechanism is one in number and is located on the same side of the handrail frame as the angle adjuster.

4. The handrail assembly with a built-in limiting mechanism as described in claim 2, characterized in that, The limiting mechanism is one in number and is located on the same side of the handrail frame as the adapter sleeve.

5. The handrail assembly with a built-in limiting mechanism as described in claim 2, characterized in that, The number of limiting mechanisms is two, and they are respectively arranged on the same side of the handrail frame as the angle adjuster and the adapter sleeve.

6. The handrail assembly with a built-in limiting mechanism as described in claim 1, characterized in that, The opposite sides of the armrest frame are rotatably connected to the corresponding shafts via an angle adjuster.

7. The handrail assembly with a built-in limiting mechanism as described in claim 6, characterized in that, The limiting mechanism is one in number, and it is located on the same side of the handrail frame as the angle adjuster on any side.

8. The handrail assembly with a built-in limiting mechanism as described in claim 6, characterized in that, The number of limiting mechanisms is two, and they are respectively arranged on the same side of the handrail frame as the angle adjusters on both sides.

9. The armrest assembly with a built-in limiting mechanism as described in any one of claims 3, 5, 7, and 8, characterized in that, The angle adjuster includes a fixed plate fixed to the shaft on the corresponding side, and a rotating plate rotatably connected to the fixed plate. The rotating plate is fixed to the corresponding side of the armrest frame. The fixed stop of the limiting mechanism, which is provided on the same side as the angle adjuster, is fixed to the shaft on the corresponding side or to the fixed plate. The movable stop is fixed to the rotating plate or to the armrest frame.

10. The handrail assembly with a built-in limiting mechanism as described in claim 9, characterized in that, The shaft is fixed with a lotus root slice for fixing to the fixed plate. The shape of the lotus root slice is adapted to the fixed plate. The fixed stop is formed at the edge of the lotus root slice and extends to the rotation path of the movable stop.

11. The armrest assembly with a built-in limiting mechanism as described in claim 10, characterized in that, The shaft is provided with an irregularly shaped end that is adapted to the hinge portion and / or the irregularly shaped hole on the lotus root slice.

12. The handrail assembly with a built-in limiting mechanism as described in claim 10, characterized in that, One end of the movable stop is fixed to the handrail frame at the periphery of the rotating disk, and the other end extends beyond the surface of the lotus root slice in a direction away from the handrail frame.

13. The handrail assembly with a built-in limiting mechanism as described in claim 12, characterized in that, The movable stop is an arc-shaped piece.

14. The handrail assembly with a built-in limiting mechanism as described in claim 4 or 5, characterized in that, The fixing stop of the limiting mechanism, which is provided on the same side as the adapter sleeve, includes a fixing protrusion. The fixing protrusion is fixed on the shaft on the corresponding side and extends outward along the radial direction of the shaft. The movable stop includes a movable protrusion. The movable protrusion is fixed on the inner circumferential surface of the adapter sleeve and extends inward along the radial direction of the adapter sleeve.

15. The handrail assembly with a built-in limiting mechanism as described in claim 14, characterized in that, The number of fixed protrusions is two and they are arranged opposite each other along the radial direction of the shaft. The number of movable protrusions is two and they are arranged opposite each other along the radial direction of the adapter sleeve.

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