Armrest box height adjusting device and armrest box

Abstract

The utility model discloses an armrest box height adjusting device and an armrest box, and belongs to the technical field of vehicles, the armrest box height adjusting device comprises a support, a connecting shaft, a limiting plate and a locking assembly; a strip-shaped hole used for height adjustment and a positioning groove used for height locking are formed in the support. A connecting shaft is mounted in the strip-shaped hole, one end of the connecting shaft is connected with the armrest box, and the height of the connecting shaft is adjusted by moving along the strip-shaped hole, so that the height of the armrest box is adjusted; a limiting plate is installed on the connecting shaft, a positioning clamping jaw is formed on the limiting plate, and the connecting shaft is limited by the positioning clamping jaw in the mode that the positioning clamping jaw is connected into the positioning groove of the support in an embedded mode; a locking assembly is installed on the connecting shaft so that the connecting shaft and the limiting plate can be locked on the support. The height adjusting device is designed for the vehicle armrest box, the problem that operation and use experience of a driver are affected due to the fact that the height of the armrest box is fixed and cannot be adjusted is solved, and the height adjusting device is simple in structure, small in operation space and wide in application range.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology, and relates to the armrest box in a vehicle. Specifically, it relates to a height adjustment device for the armrest box of a vehicle. Background Technology

[0002] In a car cab, a handrail is usually located next to the driver's seat to provide arm support and storage. However, for certain excavator models, such as... Figure 1 As shown, sometimes an armrest box 10 is provided on the left and right sides of the driver's seat 20, and an operating handle 11 is provided on the armrest box 10 so that the driver can operate the excavator more flexibly.

[0003] In existing vehicles, the height of the armrest box is generally fixed and not adjustable, but the height of the driver's seat can be adjusted automatically or manually according to the driver's height and build. This is... Figure 1 In the case of the excavator shown, when the height of the driver's seat 20 is adjusted, the operating handle 11 on the armrest box 10 may no longer be easily accessible to the driver in certain situations, which can seriously affect the driver's normal operation. Furthermore, for armrest boxes that only provide arm support and storage, when the driver's seat height is adjusted, the height difference between the seat and the armrest box changes, making it potentially uncomfortable for the driver to support their arms on the armrest box, thus affecting the driver's user experience. Summary of the Invention

[0004] This invention addresses the problem that the fixed height of the armrest box in existing vehicles may affect the driver's operation and user experience. It proposes an armrest box height adjustment device that allows the armrest box height to be adjusted according to actual usage needs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] In one aspect, this utility model proposes a height adjustment device for an armrest box, comprising:

[0007] The bracket has strip holes and positioning grooves formed on it;

[0008] A connecting shaft is installed in the slotted hole of the bracket and one end is connected to the armrest box. The height of the armrest box is adjusted by moving the connecting shaft along the slotted hole.

[0009] A limiting plate is mounted on the connecting shaft and has a positioning claw formed thereon. The positioning claw limits the connecting shaft by engaging with the positioning groove of the bracket.

[0010] A locking assembly, which is mounted on the connecting shaft, is used to lock the connecting shaft and the limiting plate onto the bracket.

[0011] In some embodiments of this application, the bracket may be configured to include a mounting portion and a vertical plate; wherein, the mounting portion is used to install the armrest height adjustment device to other components, such as to the bottom support of the driver's seat, to achieve positioning and fixed assembly of the armrest height adjustment device; the strip hole and positioning groove may be formed on the vertical plate, wherein the strip hole may extend vertically or extend vertically at an angle on the vertical plate; the positioning groove may be formed along the vertical direction and form multiple slots at different heights, and the slots are configured to match the shape of the positioning claws to fit together, so as to achieve reliable assembly of the limiting plate on the bracket.

[0012] In some embodiments of this application, in order to ensure that the connecting shaft is reliably locked at the adjusted height, two sets of positioning grooves can be provided, which are placed on opposite sides of the width direction of the strip hole; at the same time, two positioning claws are formed on the limiting plate, which are respectively embedded in two slots of the same height as the positioning grooves, thereby improving the stability of the height positioning of the connecting shaft through two-point positioning.

[0013] In some embodiments of this application, one of the two sets of positioning grooves may be configured to be formed on one of the vertical sidewalls of the vertical plate to form an open groove, so as to apply force to the limiting plate and remove the limiting plate from the bracket to release the locking of the connecting shaft, after which the height of the connecting shaft can be adjusted.

[0014] In some embodiments of this application, to facilitate the removal of the limiting plate from the bracket, an extension can be formed on the limiting plate. The extension is configured to be located outside one of the positioning claws and extend away from the bracket. The positioning claw adjacent to the extension can be a positioning claw that is fitted into the opening slot. In this way, the extension can be completely located outside the bracket and does not affect the original assembly between the limiting plate and the bracket. At the same time, to facilitate the driver's grip, a handle can be further installed on the extension for the driver to hold and operate the limiting plate.

[0015] In some embodiments of this application, to improve the stability of the assembly between the limiting plate and the connecting shaft, an assembly hole can be opened on the limiting plate; the connecting shaft is designed to include a head and a rod, the head of the connecting shaft is pressed against the bracket, and its size should be larger than the width of the strip hole opened on the bracket; the rod of the connecting shaft passes through the strip hole and the assembly hole on the limiting plate and extends away from the head; the locking assembly is installed on the rod of the connecting shaft and pressed against the limiting plate, thereby clamping the bracket between the head of the connecting shaft and the limiting plate, thus fixing the limiting plate and the connecting shaft on the bracket.

[0016] In some embodiments of this application, in order to meet the assembly requirements between the limiting plate and the connecting shaft when the height of the connecting shaft is adjusted along the vertically inclined strip hole, the assembly hole on the limiting plate can be designed as an oval shape, that is, forming two straight edges to accommodate the displacement of the connecting shaft in the horizontal direction; at the same time, the rod part of the connecting shaft is designed as a cylinder, and the top and bottom surfaces of the end connecting to the head are formed as assembly surfaces. The assembly surfaces are designed as planes to press against the two straight edges of the assembly hole on the limiting plate. By changing the point contact to surface contact, the rotation of the connecting shaft can be prevented, thereby improving the stability of the assembly between the connecting shaft and the limiting plate. At the same time, the connecting shaft can be locked in an upright position, which facilitates the stable assembly of the armrest box on the connecting shaft.

[0017] In some embodiments of this application, a washer and a nut may be configured in the locking assembly, wherein the washer may be fitted onto the rod portion of the connecting shaft and pressed against the limiting plate; the nut is threadedly connected to the rod portion of the connecting shaft and pressed against the washer, so as to lock the connecting shaft and the limiting plate to the bracket.

[0018] In another aspect, this utility model also proposes an armrest box equipped with an armrest box height adjustment device; the armrest box height adjustment device includes a bracket, a connecting shaft, a limiting plate, and a locking assembly; wherein, the bracket has a strip-shaped hole and a positioning groove; the connecting shaft is installed in the strip-shaped hole of the bracket and one end is connected to the armrest box, the connecting shaft adjusts its height by moving along the strip-shaped hole, thereby adjusting the height of the armrest box; the limiting plate is installed on the connecting shaft and has a positioning claw formed thereon, the positioning claw limiting the connecting shaft by engaging with the positioning groove of the bracket; the locking assembly is installed on the connecting shaft and is used to lock the connecting shaft and the limiting plate on the bracket.

[0019] In some embodiments of this application, the rear side of the armrest box can be fixed and the front side can be installed to the connecting shaft. In this case, the strip hole should be opened vertically at an angle, and the angle of the strip hole should be adapted to the movement trajectory when the front side of the armrest box is adjusted, so as to realize the flexible adjustment of the front side height of the armrest box and thus meet the actual use needs of different drivers.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are mainly reflected in:

[0021] 1. The height adjustment device of this utility model achieves multi-level height adjustment of the connecting shaft by opening a strip hole for height adjustment and a positioning groove for height locking on the bracket, together with a limiting plate. The locking assembly securely assembles the connecting shaft and the limiting plate on the bracket. By installing the armrest box in the vehicle cab onto the connecting shaft, the height of the armrest box can be freely adjusted to meet the actual usage needs of different drivers.

[0022] 2. The armrest height adjustment device of this utility model is suitable for different types of vehicles. When applied to engineering vehicles such as excavators, adjusting the height of the armrest makes it easier for the driver to access the operating handles, facilitating flexible operation of the excavator. Applying this armrest height adjustment device to ordinary vehicles, by adjusting the height of the armrest and changing the height difference between the armrest and the seat, allows the driver to feel more comfortable when supporting their arms on the armrest, thus improving the user experience.

[0023] 3. The armrest box height adjustment device of this utility model has a simple structure, low processing cost, and small operating space. It is applicable even to vehicles with limited interior space, and has a wide range of applications and strong applicability.

[0024] Other features and advantages of this utility model will become clearer after reading the specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0026] Figure 1 This is a structural diagram illustrating one embodiment of the positional relationship between the driver's seat and the armrest box;

[0027] Figure 2 This is a schematic diagram of the overall structure of one embodiment of the armrest box height adjustment device proposed in this utility model;

[0028] Figure 3 yes Figure 2 A schematic diagram of the armrest height adjustment device from another perspective;

[0029] Figure 4 yes Figure 2 The diagram shown is an exploded view of the armrest height adjustment device.

[0030] Figure 5 yes Figure 4 A schematic diagram of one embodiment of the support structure;

[0031] Figure 6 yes Figure 4 A schematic diagram of the structure of one embodiment of the connecting shaft in the diagram;

[0032] Figure 7 yes Figure 4 A schematic diagram of one embodiment of the limiting plate in the middle;

[0033] Figure 8 This is a schematic diagram of a structural embodiment of the assembly relationship between the connecting shaft and the limiting plate;

[0034] Figure 9 It is Figure 2 The diagram shows an assembly relationship of one embodiment where the armrest height adjustment device is installed on the armrest box.

[0035] In the diagram, 10 is the armrest box; 11 is the operating handle; 20 is the seat; 21 is the bottom support base; 30 is the seat armrest; 31 is the support column; 32 is the telescopic part; 100 is the bracket; 110 is the horizontal plate; 120 is the vertical plate; 121 is the vertical side wall; 130 is the strip hole; 140 is the positioning groove; 141 is the slot; 142 is the slot; 143 is the slot; 150 is the opening groove; 151 is the slot; 152 is the slot; 153 is the slot; 200 is the connecting shaft; 210 is the head; 220 is the rod; 221 is the assembly surface; 222 is the mounting hole; 300 is the limit plate; 310 is the assembly hole; 320 is the positioning claw; 330 is the positioning claw; 340 is the extension; 400 is the locking assembly; 410 is the washer; 420 is the nut; 500 is the handle; 510 is the nut. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front", "rear", 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 or operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral molding, or an internal connection of components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0039] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] Combination Figures 2 to 4 As shown, this embodiment designs a height adjustment device for the armrest box on a vehicle, which mainly includes key components such as a bracket 100, a connecting shaft 200, a limiting plate 300, and a locking assembly 400.

[0041] The bracket 100 is used to connect related components of other equipment to achieve fixed assembly of the height adjustment device with other equipment. At the same time, the bracket 100 also serves as a carrier to support other components in the height adjustment device.

[0042] In some embodiments, such as Figure 5 As shown, the bracket 100 can be designed as an L-shaped plate structure, including a horizontal plate 110 and a vertical plate 120. The horizontal plate 110 serves as a mounting part for assembly and fixation with related components of other equipment. The vertical plate 120 can have a strip hole 130 for height adjustment and a positioning groove 140 for height locking.

[0043] In some embodiments, the strip-shaped hole 130 can be designed as an oval shape, that is, the two ends of the strip-shaped hole 130 in the length direction are arc-shaped, and the two sides in the width direction are straight edges. For an armrest box that can be height-adjusted as a whole, the strip-shaped hole 130 can be vertically opened on the vertical plate 120. For an armrest box that is fixed at one end and height-adjustable at the other end, the strip-shaped hole 130 can be vertically inclined on the vertical plate 120, for example... Figure 5The diagram shows the slot 130 tilted to the upper left. Of course, the slot 130 can also be tilted to the upper right, as long as it can adapt to the movement trajectory of the height-adjustable end of the armrest box during the height adjustment process.

[0044] The positioning groove 140 can be opened vertically on the vertical plate 120, and multiple slots 141, 142, and 143 can be formed at different height positions. In some embodiments, the positioning groove 140 is preferably opened in two sets, and is opened on opposite sides of the width direction of the strip hole 130, so as to improve the stability of the assembly of the bracket 100 and the limiting plate 300.

[0045] In some embodiments, one set of positioning grooves 140 may be formed on one of the vertical sidewalls 121 of the vertical plate 120, that is, forming an opening groove 150, so as to arrange the handle 500 on the limiting plate 300.

[0046] The connecting shaft 200, used to connect the armrest box and control its height adjustment, is inserted into the slot 130 of the bracket 100. Figure 2 , Figure 3 As shown, the connecting shaft 200 can move along the length of the strip hole 130, thereby changing the height of the connecting shaft 200. By changing the height of the connecting shaft 200, the height of the armrest box can be adjusted.

[0047] In some embodiments, the connecting shaft 200 may be designed as a screw, including a head 210 and a rod 220, such as... Figure 6 As shown. The head 210 can be designed as a disc shape with a diameter larger than the width of the slot 130. The rod 220 can be designed as a cylinder, perpendicular to the head 210 and extending away from it. The diameter of the rod 220 is configured to be smaller than the width of the slot 130 so that the rod 220 can pass through the slot 130, pressing the head 210 against the vertical plate 120 of the bracket 100. A limiting plate 300 is installed on the rod 220, and the limiting plate 300 and the head 210 are positioned on opposite sides of the vertical plate 120. The limiting plate 300 is installed in the positioning groove 140 to limit the connecting shaft 200 at the adjusted height.

[0048] In some embodiments, to improve the stability of the assembly between the connecting shaft 200 and the limiting plate 300, an assembly surface 221 can be formed at one end of the connecting head 210 of the rod 220. The assembly surface 221 can be a plane, formed on the top and bottom surfaces of the rod 220 respectively, so that the connecting shaft 200 and the limiting plate 300 are assembled by surface contact rather than point contact.

[0049] In addition, a mounting hole 222 can be provided at the end of the rod 220 away from the head 210. When the armrest box is installed on the connecting shaft 200, the mounting hole 222 can be used for positioning or assembly.

[0050] In this embodiment, the limiting plate 300 is used to cooperate with the positioning groove 140 on the bracket 100 to lock the height of the connecting shaft 200.

[0051] Specifically, such as Figure 7 As shown, an assembly hole 310 can be made on the limiting plate 300 for assembly with the connecting shaft 200. At the same time, positioning claws 320 and 330 are formed on the limiting plate 300 for assembly with the positioning groove 140 on the bracket 100.

[0052] In some embodiments, to accommodate the cylindrical rod portion 220 in the connecting shaft 200, the mounting hole 310 can be designed as an oval shape, including two straight sides at the top and bottom and rounded sides at the left and right ends. The rod portion 220 of the connecting shaft 200 passes through the mounting hole 310 on the limiting plate 300, as follows: Figure 8 As shown, the upper and lower straight edges of the mounting hole 310 are respectively pressed against the two mounting surfaces 221 formed on the top and bottom surfaces of the connecting shaft 220. This not only improves the stability of the assembly between the connecting shaft 200 and the limiting plate 300, but also restricts the rotation of the connecting shaft 200, and simultaneously locks the connecting shaft 200 in a supporting state, that is, as shown. Figure 2 The state shown is to facilitate the assembly of the connecting shaft 200 with the armrest box.

[0053] In the case where two sets of positioning grooves 140 are provided on the bracket 100, two positioning claws 320 and 330 can be formed on the limiting plate 300 and placed on the left and right sides of the assembly hole 310 respectively. The distance between the two positioning claws 320 and 330 is adapted to the distance between the two sets of positioning grooves 140 on the bracket 100; the shape and size of each positioning claw 320 and 330 are adapted to the shape and size of the slots 141, 142 and 143 in the positioning groove 140 respectively, so as to fit together.

[0054] Because the positioning claws 320 and 330 and the positioning groove 140 restrict the installation position of the limiting plate 300 on the bracket 100, when the connecting shaft 200 moves in an inclined upward or downward direction along the strip hole 130 on the bracket 100, the connecting shaft 200 will be displaced in the horizontal direction relative to the limiting plate 300. In this embodiment, the mounting hole 310 on the limiting plate 300 is designed to be oval, which can provide adaptation space for the horizontal displacement of the connecting shaft 200.

[0055] To facilitate the removal of the limiting plate 300 from the bracket 100, in some embodiments, an extension 340 may be formed on the limiting plate 300, such as... Figure 7 As shown. The extension 340 is preferably disposed on the outside of the positioning claw 330, which is fitted to the opening slot 150 on the bracket 100. That is, the positioning claw 330 is on the side away from the mounting hole 310, and the extension 340 is disposed parallel to the length direction of the mounting hole 310 and extends away from the mounting hole 310. In this way, after the limiting plate 300 is installed on the bracket 100, the extension 340 is completely located on the outside of the vertical side wall 121 of the bracket 100 and extends away from the bracket 100. This not only does not obstruct the assembly of the limiting plate 300 on the bracket 100, but also makes it convenient for a person to grip and apply force to easily remove the limiting plate 300 from the bracket 100.

[0056] To improve the comfort of hand gripping, in some embodiments, a handle 500 may be further installed on the extension 340, such as... Figure 4 As shown. In a specific embodiment, an external thread can be formed on the extension 340, and a nut 510 can be installed on the handle 500, so that the handle 500 can be detachably assembled on the extension 340 by means of a threaded connection.

[0057] To ensure that the connecting shaft 200 and the limiting plate 300 can be reliably assembled on the bracket 100, this embodiment installs a locking assembly 400 on the connecting shaft 200, such as... Figure 2 As shown, it is used to lock the connecting shaft 200 and the limiting plate 300 onto the bracket 100.

[0058] In some embodiments, the locking assembly 400 may include a washer 410 and a nut 420, such as Figure 4 As shown. The washer 410 is fitted onto the rod portion 220 of the connecting shaft 200 and pressed against the limiting plate 300; the nut 420 is threaded onto the rod portion 220 of the connecting shaft 200 and pressed against the washer 410. The fastening force between the nut 420 and the head 210 of the connecting shaft 200 is used to achieve a stable assembly of the connecting shaft 200 and the limiting plate 300 on the bracket 100.

[0059] Industrial applicability

[0060] The height adjustment device of this embodiment is applied to the handrail box in the excavator cab, so that the handrail box has a height adjustment function.

[0061] The specific installation method and height adjustment process are as follows:

[0062] Combination Figure 1 , Figure 9As shown, in some existing excavators, a handrail box 10 is provided on the left and right sides of the driver's seat 20, and some operating handles 11 are provided on the handrail box 10 to facilitate the driver's operation of the excavator.

[0063] To address this issue, a height adjustment device according to this embodiment can be installed on each armrest box 10, so that both armrest boxes 10 can be adjusted to a suitable height according to the driver's actual usage needs.

[0064] When installing the height adjustment device, the bracket 100 of the height adjustment device can first be installed onto the driver's seat 20. As a specific embodiment, the horizontal plate 110 of the bracket 100 can be installed onto the bottom support 21 of the driver's seat 20, such as... Figure 9 As shown. The bottom support 21 is a fixed component and will not rise or fall with the driver's seat 20, so that the whole can remain in a fixed state after the height adjustment device is installed.

[0065] In some embodiments, the specific mounting position of the height adjustment device on the bottom support 21 of the driver's seat 20 may correspond to the front side of the armrest box 10, and the handle 500 may face the front of the driver's seat 20.

[0066] The front side of the armrest box 10 is mounted on the connecting shaft 200 in the height adjustment device, and sufficient space is left between the armrest box 10 and the vertical plate 120 of the bracket 100 to facilitate the operation of the locking assembly 400 and the limiting plate 300 during height adjustment.

[0067] The rear side of the armrest box 10 is fixed, for example, the rear side of the armrest box 10 can be pivotally fixed to the support column 31 of the seat armrest 30, such as... Figure 9 As shown. The support column 31 can be a non-adjustable fixed column or a fixed part of a telescopic rod. If it is a fixed part of a telescopic rod, the seat armrest 30 can be installed to the telescopic part 32 of the telescopic rod to achieve height adjustment of the seat armrest 30.

[0068] If the height of the armrest box 10 is not suitable after the driver adjusts the height of the seat 20, the driver can first loosen the locking component 400 in the height adjustment device, that is, release the fastening state of the limit plate 300 on the bracket 100. Then, pull the handle 500 to remove the limit plate 300 from the bracket 100.

[0069] Raise or lower the connecting shaft 200 to adjust the height of the armrest box 10 to a suitable position.

[0070] Then, the two positioning claws 320 and 330 on the limiting plate 300 are respectively installed into the two sets of positioning grooves 140 and 150 on the bracket 100, specifically embedded in two slots of the same height in the two sets of positioning grooves 140 and 150, such as slots 141 and 151, or slots 142 and 152, or slots 143 and 153, thereby locking the connecting shaft 200 at the adjusted height.

[0071] Then, tighten the locking assembly 400 to fix the limiting plate 300 and the connecting shaft 200 on the bracket 100, thus completing the adjustment and locking of the height of the armrest box 10.

[0072] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A height adjustment device for an armrest box, characterized in that, include: The bracket has strip holes and positioning grooves formed on it; A connecting shaft is installed in the slotted hole of the bracket and one end is connected to the armrest box. The height of the armrest box is adjusted by moving the connecting shaft along the slotted hole. A limiting plate is mounted on the connecting shaft and has a positioning claw formed thereon. The positioning claw limits the connecting shaft by engaging with the positioning groove of the bracket. A locking assembly, which is mounted on the connecting shaft, is used to lock the connecting shaft and the limiting plate onto the bracket.

2. The armrest height adjustment device according to claim 1, characterized in that, The support includes: The mounting section is used to install the armrest box height adjustment device to other components; A vertical plate has the aforementioned strip-shaped hole and positioning groove; wherein, the strip-shaped hole extends vertically or extends vertically at an angle on the vertical plate; the positioning groove is opened along the vertical direction and forms multiple slots at different heights, the slots matching the shape of the positioning claws to fit together.

3. The armrest height adjustment device according to claim 2, characterized in that, The positioning groove includes two sets, which are respectively placed on opposite sides in the width direction of the strip hole; Two positioning claws are formed on the limiting plate, which are respectively embedded in two slots of the same height as the positioning groove.

4. The armrest height adjustment device according to claim 3, characterized in that, In the two sets of positioning grooves, one set of positioning grooves is formed on one of the vertical sidewalls of the vertical plate, forming an open groove.

5. The armrest height adjustment device according to claim 4, characterized in that, An extension is formed on the limiting plate. The extension is located outside one of the positioning claws and extends away from the bracket. The positioning claw adjacent to the extension is engaged in the opening groove. A handle is mounted on the extension for hand operation of the limiting plate.

6. The armrest height adjustment device according to any one of claims 1 to 5, characterized in that, Assembly holes are provided on the limiting plate; The connecting shaft includes a head and a rod. The head presses against the bracket and its size is larger than the width of the strip hole on the bracket. The rod extends away from the head through the strip hole and the mounting hole on the limiting plate. The locking assembly is installed on the rod portion of the connecting shaft and presses against the limiting plate to clamp the bracket between the head of the connecting shaft and the limiting plate.

7. The armrest height adjustment device according to claim 6, characterized in that, The mounting hole on the limiting plate is oval-shaped and has two straight sides, upper and lower. The rod portion of the connecting shaft is cylindrical, and its top and bottom surfaces, which connect to one end of the head, form an assembly surface. The assembly surface is a plane and is pressed against the upper and lower straight edges of the assembly hole on the limiting plate.

8. The armrest height adjustment device according to claim 6, characterized in that, The locking assembly includes: Washers are fitted onto the rod portion of the connecting shaft and pressed against the limiting plate; A nut, which is threaded to the rod portion of the connecting shaft and pressed against the washer.

9. An armrest box, characterized in that, It is equipped with a height adjustment device for the armrest box as described in any one of claims 1 to 8.

10. The armrest box according to claim 9, characterized in that, The armrest box is fixedly assembled at the rear and installed to the connecting shaft at the front. The strip hole is vertically inclined and the inclination direction is adapted to the movement trajectory when the front of the armrest box is adjusted in height.

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