CN211186315U - Adjustable desk based on man-machine engineering - Google Patents
Adjustable desk based on man-machine engineering Download PDFInfo
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Abstract
本实用新型公开了一种基于人机工学的可调节课桌,属于课桌领域,一种基于人机工学的可调节课桌,包括支撑框体,支撑框体下端固定连接有一对呈左右对称分布的升降桌腿,支撑框体上端转动连接有桌面板,支撑框体内转动连接有传动轴,传动轴外端固定连接有一对呈左右对称分布的齿轮,传动轴右端贯穿支撑框体并固定连接有旋钮,支撑框体下端固定连接有一对与齿轮啮合连接的弧形齿板,支撑框体左右两内壁均开凿有容纳槽,容纳槽内滑动连接有卡块,可以实现便于青少年学生根据自身需要将桌面板倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。
The utility model discloses an adjustable desk based on ergonomics, which belongs to the field of desks. An adjustable desk based on ergonomics comprises a support frame body. The lower end of the support frame body is fixedly connected with a pair of left-right symmetrical pairs. Distributed lifting table legs, the upper end of the support frame is rotatably connected with the desktop board, the support frame is rotatably connected with a transmission shaft, the outer end of the transmission shaft is fixedly connected with a pair of gears that are symmetrically distributed on the left and right, and the right end of the transmission shaft penetrates the support frame and is fixedly connected There are knobs, the lower end of the support frame is fixedly connected with a pair of arc-shaped tooth plates that are meshed with the gears, the left and right inner walls of the support frame are cut with accommodating grooves, and the accommodating grooves are slidably connected with clips, which can be convenient for young students to meet their own needs. The desktop board is tilted at a certain angle, so that students can obtain a suitable line of sight when writing or reading, and effectively prevent students from leaning forward and bowing their heads for a long time, which will affect their health.
Description
技术领域technical field
本实用新型涉及课桌领域,更具体地说,涉及一种基于人机工学的可调节课桌。The utility model relates to the field of desks, in particular to an adjustable desk based on ergonomics.
背景技术Background technique
课桌是学生在校学习必然会使用的一种学生用具,但目前大多数课桌为固定的制式课桌,其自身高度固定、无法调节,因而对于处在生长阶段、身高情况常常变化的学生而言并不方便,课桌过矮则学生在学习时需要弯腰低头,使得颈椎和脊椎发育不良,课桌过高则学生会因为眼睛离桌面太近,长时间使用容易引发近视。Desks are a kind of student utensils that students will inevitably use in school, but at present most desks are fixed standard desks, and their height is fixed and cannot be adjusted. It is inconvenient. If the desk is too short, students need to bend down and bow their heads when studying, resulting in poor development of the cervical spine and spine. If the desk is too high, students will have their eyes too close to the desktop, which may lead to myopia if they are used for a long time.
为解决课桌高度调节不便这一问题,目前市场上出现了多种基于人机工学设计的可调节课桌,可以通过调节升降桌腿来调节桌面的高度,以适应不同身高的学生,然而这些课桌的桌面一般都是水平固定的,青少年学生在书写或阅读时,身体通常会习惯性向前倾斜,长时间地在水平桌面上书写和阅读容易造成青少年学生的脊柱不正常弯曲,严重的会影响学生的身体健康。In order to solve the problem of inconvenient height adjustment of desks, a variety of adjustable desks based on ergonomic design have appeared on the market. The height of the desk can be adjusted by adjusting the legs of the desk to adapt to students of different heights. However, these The desks of the desks are generally fixed horizontally. When young students write or read, their bodies usually lean forward habitually. Writing and reading on a horizontal desk for a long time will easily cause abnormal curvature of the spine of young students, which may cause serious damage. affect the health of students.
实用新型内容Utility model content
1.要解决的技术问题1. Technical problems to be solved
针对现有技术中存在的问题,本实用新型的目的在于提供一种基于人机工学的可调节课桌,它可以实现便于青少年学生根据自身需要将桌面板倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。Aiming at the problems existing in the prior art, the purpose of this utility model is to provide an adjustable desk based on ergonomics, which can make it easy for young students to tilt the desktop board at a certain angle according to their own needs, so that students can write or write When reading, you can get a suitable sight angle, which can effectively prevent students from leaning forward and bowing their heads for a long time, which will affect their health.
2.技术方案2. Technical solutions
为解决上述问题,本实用新型采用如下的技术方案。In order to solve the above problems, the present invention adopts the following technical solutions.
一种基于人机工学的可调节课桌,包括支撑框体,所述支撑框体下端固定连接有一对呈左右对称分布的升降桌腿,所述支撑框体上端转动连接有桌面板,所述支撑框体内转动连接有传动轴,所述传动轴外端固定连接有一对呈左右对称分布的齿轮,所述传动轴右端贯穿支撑框体并固定连接有旋钮,所述支撑框体下端固定连接有一对与齿轮啮合连接的弧形齿板,所述支撑框体左右两内壁均开凿有容纳槽,所述容纳槽内滑动连接有卡块,所述容纳槽内底部与卡块之间固定连接有压缩弹簧,所述弧形齿板靠近容纳槽的一端开凿有多个与卡块相匹配的卡槽,所述卡块远离弧形齿板的一端固定连接有拉杆,且拉杆贯穿支撑框体并延伸至支撑框体外,所述拉杆远离卡块的一端固定连接有拉帽,可以实现便于青少年学生根据自身需要将桌面板倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。An adjustable desk based on ergonomics, comprising a support frame body, a pair of lifting desk legs symmetrically distributed on the left and right are fixedly connected to the lower end of the support frame body, and a desktop board is rotatably connected to the upper end of the support frame body, and the A transmission shaft is rotatably connected in the support frame, the outer end of the transmission shaft is fixedly connected with a pair of gears symmetrically distributed on the left and right, the right end of the transmission shaft penetrates the support frame and is fixedly connected with a knob, and the lower end of the support frame is fixedly connected with a For the arc-shaped toothed plate meshingly connected with the gears, the left and right inner walls of the support frame are drilled with accommodating grooves, the accommodating grooves are slidably connected with clamping blocks, and the inner bottom of the accommodating grooves and the clamping blocks are fixedly connected. Compression spring, one end of the arc-shaped tooth plate close to the accommodating groove is drilled with a plurality of clamping grooves that match the clamping block, and one end of the clamping block away from the arc-shaped tooth plate is fixedly connected with a pull rod, and the pull rod penetrates the support frame and Extending to the outside of the support frame, a pull cap is fixedly connected to the end of the pull rod away from the clamping block, which can make it easy for young students to tilt the desktop board at a certain angle according to their own needs, so that students can obtain a suitable sight angle when writing or reading, Effectively prevent students from leaning forward and bowing their heads for a long time and affecting their health.
进一步的,所述卡槽的具体数量为6-10对,且卡槽均匀分布于弧形齿板外端,卡块与相应位置的卡槽相结合,可以将弧形齿板卡接固定于不同的高度,从而使桌面板可以倾斜多个不同的角度。Further, the specific number of the card slots is 6-10 pairs, and the card slots are evenly distributed on the outer end of the arc-shaped tooth plate. Different heights, so that the tabletop can be tilted at many different angles.
进一步的,所述支撑框体左右两内壁均固定连接有多个T形滑块,所述弧形齿板靠近T形滑块的一端开凿有多个与T形滑块滑动连接的T形导向槽,T形滑块和T形导向槽之间的相互配合,可以起到限定弧形齿板移动轨迹的作用。Further, a plurality of T-shaped sliders are fixedly connected to the left and right inner walls of the support frame, and a plurality of T-shaped guides that are slidably connected to the T-shaped slider are drilled at one end of the arc-shaped toothed plate close to the T-shaped slider. The mutual cooperation between the groove, the T-shaped slider and the T-shaped guide groove can play the role of defining the moving track of the arc-shaped tooth plate.
进一步的,所述支撑框体上端固定连接有与桌面板相匹配的置物板,且置物板上表面与桌面板上表面相平齐,置物板是水平固定的,不会随桌面板一同倾斜,便于学生摆放未使用的学习用品。Further, the upper end of the support frame body is fixedly connected with a storage board matching the desktop board, and the upper surface of the storage board is flush with the upper surface of the desktop board, the storage board is fixed horizontally, and will not be inclined together with the desktop board. Make it easy for students to put away unused school supplies.
进一步的,所述桌面板上表面固定连接有防滑橡胶垫,所述桌面板上端固定连接有挡板,且挡板左端与桌面板左端相平齐,当桌面板倾斜时,防滑橡胶垫和挡板均可以有效避免桌面板上的物品掉落。Further, a non-slip rubber pad is fixedly connected to the surface of the desktop board, a baffle is fixedly connected to the upper end of the desktop board, and the left end of the baffle is flush with the left end of the desktop board. The board can effectively prevent the items on the desktop board from falling.
进一步的,所述支撑框体上端固定连接有缓冲橡胶垫,且缓冲橡胶垫的厚度为2-5mm,当学生将桌面板复位时,缓冲橡胶垫可以对回落的桌面板起到缓冲减震的作用,有效避免桌面板和支撑框体之间发生碰撞而受损。Further, the upper end of the support frame is fixedly connected with a buffer rubber pad, and the thickness of the buffer rubber pad is 2-5mm. When the student resets the desktop board, the buffer rubber pad can cushion the falling desktop board. It can effectively avoid damage caused by collision between the desktop board and the supporting frame.
3.有益效果3. Beneficial effects
相比于现有技术,本实用新型的优点在于:Compared with the prior art, the advantages of the present utility model are:
(1)本方案可以实现便于青少年学生根据自身需要将桌面板倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。(1) This solution can make it easy for young students to tilt the desktop board at a certain angle according to their own needs, so that students can obtain a suitable sight angle when writing or reading, and effectively avoid students leaning forward and bowing their heads for a long time and affecting their health. .
(2)卡槽的具体数量为6-10对,且卡槽均匀分布于弧形齿板外端,卡块与相应位置的卡槽相结合,可以将弧形齿板卡接固定于不同的高度,从而使桌面板可以倾斜多个不同的角度。(2) The specific number of card slots is 6-10 pairs, and the card slots are evenly distributed on the outer end of the arc-shaped tooth plate. The card block is combined with the corresponding position of the card slot, and the arc-shaped tooth plate can be clamped and fixed to different height, so that the tabletop can be tilted at many different angles.
(3)支撑框体左右两内壁均固定连接有多个T形滑块,弧形齿板靠近T形滑块的一端开凿有多个与T形滑块滑动连接的T形导向槽,T形滑块和T形导向槽之间的相互配合,可以起到限定弧形齿板移动轨迹的作用。(3) A plurality of T-shaped sliders are fixedly connected to the left and right inner walls of the support frame, and a plurality of T-shaped guide grooves for sliding connection with the T-shaped slider are cut out at one end of the arc-shaped tooth plate close to the T-shaped slider. The mutual cooperation between the sliding block and the T-shaped guide groove can play the role of limiting the movement track of the arc-shaped tooth plate.
(4)支撑框体上端固定连接有与桌面板相匹配的置物板,且置物板上表面与桌面板上表面相平齐,置物板是水平固定的,不会随桌面板一同倾斜,便于学生摆放未使用的学习用品。(4) The upper end of the support frame is fixedly connected with a storage board that matches the desktop board, and the upper surface of the storage board is flush with the surface of the desktop board. The storage board is fixed horizontally and will not tilt with the desktop board, which is convenient for students. Put away unused school supplies.
(5)桌面板上表面固定连接有防滑橡胶垫,桌面板上端固定连接有挡板,且挡板左端与桌面板左端相平齐,当桌面板倾斜时,防滑橡胶垫和挡板均可以有效避免桌面板上的物品掉落。(5) The surface of the desktop board is fixedly connected with a non-slip rubber pad, the upper end of the desktop board is fixedly connected with a baffle, and the left end of the baffle is flush with the left end of the desktop board. When the desktop board is tilted, both the anti-skid rubber pad and the baffle can be effective. Avoid dropping items on the tabletop.
(6)支撑框体上端固定连接有缓冲橡胶垫,且缓冲橡胶垫的厚度为2-5mm,当学生将桌面板复位时,缓冲橡胶垫可以对回落的桌面板起到缓冲减震的作用,有效避免桌面板和支撑框体之间发生碰撞而受损。(6) The upper end of the support frame is fixedly connected with a buffer rubber pad, and the thickness of the buffer rubber pad is 2-5mm. When the student resets the desktop board, the buffer rubber pad can play a role of buffering and shock absorption on the falling desktop board. Effectively avoid damage due to collision between the desktop board and the supporting frame.
附图说明Description of drawings
图1为本实用新型的内部结构示意图;Fig. 1 is the internal structure schematic diagram of the present utility model;
图2为本实用新型的右侧面内部结构示意图;2 is a schematic diagram of the internal structure of the right side of the present utility model;
图3为本实用新型的弧形齿板和支撑框体连接处的结构示意图;3 is a schematic structural diagram of the connection between the curved tooth plate and the support frame of the present invention;
图4为图3中A-A处的截面示意图;Figure 4 is a schematic cross-sectional view at A-A in Figure 3;
图5为本实用新型的桌面板倾斜后的结构示意图。FIG. 5 is a schematic structural diagram of the desktop board of the present invention after tilting.
图中标号说明:Description of the labels in the figure:
1支撑框体、2升降桌腿、3桌面板、4传动轴、5齿轮、6旋钮、7弧形齿板、8容纳槽、9卡块、10压缩弹簧、11卡槽、12拉杆、13拉帽、14T形滑块、15置物板、16挡板。1 Supporting frame, 2 Lifting table legs, 3 Desktop board, 4 Drive shaft, 5 Gear, 6 Knob, 7 Arc toothed plate, 8 Receiving slot, 9 Clamping block, 10 Compression spring, 11 Clamping slot, 12 Pull rod, 13 Pull cap, 14T-shaped slider, 15 object board, 16 baffle.
具体实施方式Detailed ways
下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述;显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例,基于本实用新型中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. For example, based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
在本实用新型的描述中,需要说明的是,术语“上”、“下”、“内”、“外”、“顶/底端”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本实用新型和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本实用新型的限制。此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性。In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. is based on the drawings shown in the drawings. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limit. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.
在本实用新型的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“设置有”、“套设/接”、“连接”等,应做广义理解,例如“连接”,可以是固定连接,也可以是可拆卸连接,或一体地连接;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以具体情况理解上述术语在本实用新型中的具体含义。In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "provided with", "sleeve/connection", "connection", etc., should be understood in a broad sense, such as "Connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be two elements Internal connectivity. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.
实施例1:Example 1:
请参阅图1,一种基于人机工学的可调节课桌,包括支撑框体1,支撑框体1下端固定连接有一对呈左右对称分布的升降桌腿2,升降桌腿2为现有技术,在此不再赘述,请参阅图1-2,支撑框体1上端转动连接有桌面板3,桌面板3旋转角度为0°-30°,可以有效避免桌面板3过度倾斜导致书本掉落,支撑框体1内转动连接有传动轴4,传动轴4外端固定连接有一对呈左右对称分布的齿轮5,传动轴4右端贯穿支撑框体1并固定连接有旋钮6,支撑框体1下端固定连接有一对与齿轮5啮合连接的弧形齿板7,请参阅图3,支撑框体1左右两内壁均开凿有容纳槽8,容纳槽8内滑动连接有卡块9,容纳槽8内底部与卡块9之间固定连接有压缩弹簧10,弧形齿板7靠近容纳槽8的一端开凿有多个与卡块9相匹配的卡槽11,卡块9左半部和卡槽11均呈直角三角形,如图4所示,卡块9在压缩弹簧10的作用下会与卡槽11相结合,从而对弧形齿板7起到固定支撑作用,卡块9远离弧形齿板7的一端固定连接有拉杆12,且拉杆12贯穿支撑框体1并延伸至支撑框体1外,拉杆12远离卡块9的一端固定连接有拉帽13,可以实现便于青少年学生根据自身需要将桌面板3倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。Please refer to FIG. 1 , an adjustable desk based on ergonomics, including a
请参阅图4,卡槽11的具体数量为8对,且卡槽11均匀分布于弧形齿板7外端,卡块9与相应位置的卡槽11相结合,可以将弧形齿板7卡接固定于不同的高度,从而使桌面板3可以倾斜多个不同的角度,请参阅图3,支撑框体1左右两内壁均固定连接有多个T形滑块14,弧形齿板7靠近T形滑块14的一端开凿有多个与T形滑块14滑动连接的T形导向槽,T形滑块14和T形导向槽之间的相互配合,可以起到限定弧形齿板7移动轨迹的作用。Please refer to FIG. 4 , the specific number of the
请参阅图2,支撑框体1上端固定连接有与桌面板3相匹配的置物板15,且置物板15上表面与桌面板3上表面相平齐,置物板15是水平固定的,不会随桌面板3一同倾斜,便于学生摆放未使用的学习用品,桌面板3上表面固定连接有防滑橡胶垫,桌面板3上端固定连接有挡板16,且挡板16左端与桌面板3左端相平齐,当桌面板3倾斜时,防滑橡胶垫和挡板16均可以有效避免桌面板3上的物品掉落,请参阅图1,支撑框体1上端固定连接有缓冲橡胶垫,且缓冲橡胶垫的厚度为3mm,当学生将桌面板3复位时,缓冲橡胶垫可以对回落的桌面板3起到缓冲减震的作用,有效避免桌面板3和支撑框体1之间发生碰撞而受损。Please refer to FIG. 2 , the upper end of the
请参阅图1,当青少年学生需要将桌面板3倾斜一定的角度时,可以逆时针旋转旋钮6,旋钮6会通过传动轴4带动齿轮5沿逆时针旋转,请参阅图2,由于齿轮5和弧形齿板7之间是啮合连接的,齿轮5会带动弧形齿板7一同沿逆时针转动,从而使桌面板3出现倾斜,请参阅图4,在弧形齿板7沿逆时针转动过程中,在卡块9和卡槽11两个斜面的相互作用下,卡块9会向容纳槽8内移动,当弧形齿板7上的另一个卡槽11移动至与卡块9对应的位置时,卡块9会在压缩弹簧10的作用下与其相结合,之后重复以上步骤,直至学生将桌面板3调整到合适的倾斜角度,如图5所示,此时学生便可以在桌面板3上进行书写或阅读,并且在卡块9和卡槽11两个直角面的相互作用下,可以对弧形齿板7起到支撑固定作用,使弧形齿板7不会回落,当学生需要将桌面板3恢复原位时,可以拉动拉帽13,拉帽13会通过拉杆12将卡块9拉回容纳槽8内,从而使卡块9和卡槽11相互分离,此时,桌面板3便可以顺时针旋转至原位,可以实现便于青少年学生根据自身需要将桌面板3倾斜一定的角度,使学生在书写或阅读时可以获得合适的视线角度,有效避免学生长时间身体前倾、低头而影响其身体健康。Please refer to Figure 1, when the teenage students need to tilt the
以上所述,仅为本实用新型较佳的具体实施方式;但本实用新型的保护范围并不局限于此。任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内,根据本实用新型的技术方案及其改进构思加以等同替换或改变,都应涵盖在本实用新型的保护范围内。The above descriptions are only preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improvement concept, equivalently replaces or changes, should be covered within the protection scope of the present utility model.
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Cited By (8)
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CN111990801A (en) * | 2020-09-16 | 2020-11-27 | 丘远光 | Body posture correcting integrated campus desk and chair capable of being adjusted in multiple directions |
CN112401492A (en) * | 2020-11-18 | 2021-02-26 | 江西腾科实业有限公司 | Student desk with adjustable height and angle |
CN112545174A (en) * | 2020-12-28 | 2021-03-26 | 惠州市金力智能科技有限公司 | Multifunctional intelligent household learning desk and chair |
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CN113749389A (en) * | 2021-09-06 | 2021-12-07 | 浙江科沃传动机械有限公司 | Manual lifting table with locking function |
CN114197185A (en) * | 2022-01-14 | 2022-03-18 | 张飞 | An ironing device with tensioning structure for garment processing |
CN116019306A (en) * | 2023-02-08 | 2023-04-28 | 江西万橡家具集团有限公司 | Reading desk convenient for adjusting desktop angle |
CN119214425A (en) * | 2024-11-20 | 2024-12-31 | 厦门胜诚鑫科技股份有限公司 | Adjustable lifting writing board |
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2019
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111990801A (en) * | 2020-09-16 | 2020-11-27 | 丘远光 | Body posture correcting integrated campus desk and chair capable of being adjusted in multiple directions |
CN112401492A (en) * | 2020-11-18 | 2021-02-26 | 江西腾科实业有限公司 | Student desk with adjustable height and angle |
CN112401492B (en) * | 2020-11-18 | 2022-12-09 | 广东帝邦家具有限公司 | Student desk with adjustable height and angle |
CN112545174A (en) * | 2020-12-28 | 2021-03-26 | 惠州市金力智能科技有限公司 | Multifunctional intelligent household learning desk and chair |
CN112806728A (en) * | 2021-01-14 | 2021-05-18 | 吴超奕 | Desk with self-adaptive desktop angle |
CN113749389A (en) * | 2021-09-06 | 2021-12-07 | 浙江科沃传动机械有限公司 | Manual lifting table with locking function |
CN113749389B (en) * | 2021-09-06 | 2023-01-31 | 浙江科沃传动机械有限公司 | Manual lifting table with locking function |
CN114197185A (en) * | 2022-01-14 | 2022-03-18 | 张飞 | An ironing device with tensioning structure for garment processing |
CN116019306A (en) * | 2023-02-08 | 2023-04-28 | 江西万橡家具集团有限公司 | Reading desk convenient for adjusting desktop angle |
CN116019306B (en) * | 2023-02-08 | 2025-04-04 | 广东中泰家具集团有限公司 | Reading desk with easy adjustment of tabletop angle |
CN119214425A (en) * | 2024-11-20 | 2024-12-31 | 厦门胜诚鑫科技股份有限公司 | Adjustable lifting writing board |
CN119214425B (en) * | 2024-11-20 | 2025-05-13 | 厦门胜诚鑫科技股份有限公司 | Adjustable lifting writing board |
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