A student desk with stepless height adjustment

Abstract

This utility model provides a student desk with stepless height adjustment. The bottom of the panel is connected to a fixed frame and a storage drawer. Two lifting connecting tubes are symmetrically arranged on both sides of the bottom of the panel. The upper end of each lifting connecting tube is connected to the fixed frame, and the lower end extends downwards vertically. Two fixed lower leg tubes are also included, with their lower ends connected to fixed base frames. The upper end of each fixed lower leg tube extends upwards, and the lower end of the lifting connecting tube is slidably connected to the fixed lower leg tube. The stepless height adjustment mechanism includes a linear adjustment cylinder disposed between the lifting connecting tube and the fixed lower leg tube. The extension and retraction of the linear adjustment cylinder drives the lifting connecting tube to slide vertically relative to the fixed lower leg tube, thereby adjusting the height of the panel. Through a fully sealed transmission mechanism and one-button operation design, convenient and quick adjustment without tools is achieved, making it convenient for students to use.

Description

Technical Field

[0001] This utility model relates to the field of teaching furniture technology, specifically to a student desk and chair based on a hydraulic and pneumatic lifting structure. Background Technology

[0002] Students spend long hours using desks in the classroom, and the appropriate height of the desk panel is crucial to their learning state and physical health. Traditional height-adjustable desks generally use a threaded adjustment structure, which relies on threaded fasteners and requires special tools for operation, making it difficult for students to adjust them independently. Long-term use can lead to problems such as stripped threads and metal corrosion, causing the adjustment function to fail. The adjustment process is also time-consuming and laborious, making it impossible to achieve a quick height adaptation. Utility Model Content

[0003] Based on this, the present invention provides a student desk with stepless height adjustment, so as to realize tool-free and quick adjustment of the panel height, and solve the technical problems of difficult adjustment and easy damage of traditional height-adjustable desks.

[0004] To achieve the above objectives, this utility model provides a student desk with stepless height adjustment, including a panel, a lifting connecting upper tube, a fixed lower leg tube, and a stepless height adjustment mechanism. A fixed frame and a storage drawer are connected to the bottom of the panel; two lifting connecting upper tubes are symmetrically arranged on both sides of the bottom of the panel, with the upper end of each upper tube connected to the fixed frame and the lower end extending downwards vertically; two fixed lower leg tubes are also included, with their lower ends connected to a fixed base frame, and the upper end of each fixed lower leg tube extending upwards. The lower end of the lifting connecting upper tube is slidably connected to the fixed lower leg tube; and the stepless height adjustment mechanism includes a linear adjustment cylinder disposed between the lifting connecting upper tube and the fixed lower leg tube. The cylinder body of the linear adjustment cylinder is connected to the fixed lower leg tube, and the movable rod of the linear adjustment cylinder extends upwards and is connected to the lifting connecting upper tube, so that the extension and retraction of the linear adjustment cylinder drives the lifting connecting upper tube to slide vertically relative to the fixed lower leg tube, thereby adjusting the height of the panel.

[0005] Furthermore, the linear regulating cylinder is a hydraulic-pneumatic cylinder, with the cylinder body connected to the fixed lower foot tube and the movable rod connected to the lifting upper tube.

[0006] Furthermore, the cylinder body of the hydraulic pneumatic cylinder is installed inside the fixed lower foot tube, and the movable rod passes through the lifting connecting upper tube and extends out of the upper end of the lifting connecting upper tube.

[0007] Furthermore, a control switch is provided at the top of the movable rod of the hydraulic pneumatic cylinder. The top of the control switch has a spherical structure, and the lifting and lowering of the hydraulic pneumatic cylinder is controlled by the control switch.

[0008] Furthermore, a control lever is provided at the bottom of the panel. The control lever is rotatably connected to the bottom of the panel and arranged opposite to the control switch. By pressing the control switch with the control lever, the lifting and lowering control of the hydraulic pneumatic cylinder is performed.

[0009] Furthermore, the hydraulic pneumatic cylinder includes two cylinders, which are respectively disposed on both sides of the bottom of the panel. The cylinder body of each hydraulic pneumatic cylinder is connected to the fixed lower foot tube on the corresponding side, and the movable rod is connected to the lifting connecting upper tube.

[0010] Furthermore, the control lever is a linkage control lever, the linkage switch has a U-shaped structure, the middle of the linkage control lever is horizontally arranged and rotatably connected to the bottom of the panel, and the two sides of the linkage control lever are respectively driven connected to the control switches on the corresponding sides.

[0011] Furthermore, the fixed base extends along the width of the panel, and plastic protective sleeves are fitted at both ends of the fixed base.

[0012] The main technical advantages of the height-adjustable stepless student desk provided by this utility model are:

[0013] A vertically sliding upper lifting connecting tube and a fixed lower leg tube are installed between the panel and the fixed base frame. A stepless lifting adjustment mechanism including a linear adjustment cylinder is also provided. The extension and retraction of the linear adjustment cylinder drives the upper lifting connecting tube to slide vertically relative to the fixed lower leg tube, thereby adjusting the panel height. This forms a fully sealed transmission mechanism and a one-button operation design, solving the technical problems of difficult adjustment and easy damage of traditional height-adjustable desks. It enables tool-free and quick adjustment, making it convenient for students to use. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the height-adjustable stepless student desk provided by this utility model;

[0016] Figure 2 This is a schematic diagram of the distributed structure of the student desk with stepless height adjustment provided;

[0017] Figure 3 This is a schematic diagram of the structure of a single hydraulic-pneumatic cylinder provided.

[0018] Figure 4 This is a schematic diagram of the provided hydraulic pneumatic cylinder in its retracted state;

[0019] Figure 5This is a schematic diagram of the provided hydraulic pneumatic cylinder in the extended state;

[0020] Figure 6 This is a schematic diagram of the structure of two hydraulic and pneumatic cylinders linked together.

[0021] Figure 7 This is a diagram showing the student desk with stepless height adjustment in its lowest position.

[0022] Figure 8 This is a schematic diagram of the height-adjustable student desk after it has been raised.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 1-Panel;

[0025] 2-Fixed frame;

[0026] 3- Interlocking rotary control switch;

[0027] 4-Storage drawers;

[0028] 5- Lifting connection upper pipe;

[0029] 6-Hydraulic pneumatic cylinder, 61-Cylinder body, 62-Modular rod, 63-Control switch;

[0030] 7-Fix the lower leg tube;

[0031] 8-Fixed base frame;

[0032] 9-Plastic protective cover for tripod. Detailed Implementation

[0033] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. It should be noted that the following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use.

[0034] In view of the technical problems of commonly used threaded adjustment structure in height-adjustable desks, which require tools such as wrenches for adjustment, making operation inconvenient and prone to rusting after long-term use, this utility model provides a student desk with stepless height adjustment.

[0035] like Figures 1 to 8As shown, the student desk with stepless height adjustment provided by this utility model includes a panel 1, a lifting connecting upper tube 5, a fixed lower leg tube 7, and a stepless height adjustment mechanism. The panel 1 has a fixed frame 2 and a storage drawer 4 connected to its bottom. Two lifting connecting upper tubes 5 are symmetrically arranged on both sides of the bottom of the panel 1, with the upper end of each tube connected to the fixed frame 2 and the lower end extending downwards vertically. Two fixed lower leg tubes 7 are also included, with their lower ends connected to fixed base brackets 8 respectively, and the upper end of each tube extending upwards. The lower end of each lifting connecting upper tube 5 is slidably connected to the fixed lower leg tube 7. The stepless height adjustment mechanism includes a linear adjustment cylinder disposed between the lifting connecting upper tube 5 and the fixed lower leg tube 7. The cylinder body 61 of the linear adjustment cylinder is connected to the fixed lower leg tube 7, and the movable rod 62 of the linear adjustment cylinder extends upwards and is connected to the lifting connecting upper tube 5. The extension and retraction of the linear adjustment cylinder drives the lifting connecting upper tube 5 to slide vertically relative to the fixed lower leg tube 7, thereby adjusting the height of the panel 1.

[0036] The linear regulating cylinder is a hydraulic-pneumatic cylinder 6. The cylinder body 61 of the hydraulic-pneumatic cylinder 6 is connected to the fixed lower tube 7, and the movable rod 62 is connected to the lifting connecting upper tube 5. The cylinder body 61 of the hydraulic-pneumatic cylinder 6 is set inside the fixed lower tube 7, and the movable rod 62 passes through the lifting connecting upper tube 5 and extends out of the upper end of the lifting connecting upper tube 5. A control switch 63 is provided on the top of the movable rod 62 of the hydraulic-pneumatic cylinder 6. The top of the control switch 63 has a spherical structure, and the lifting and lowering of the hydraulic-pneumatic cylinder 6 is controlled by the control switch 63.

[0037] During implementation, the lifting mechanism is divided into two parts: the upper part is the movable lifting section, and the lower part is the fixed section. The movable lifting section mainly consists of a panel 1, a fixed frame 2, a linkage rotary control switch 3, a storage drawer 4, a lifting connecting pipe 5, and a movable rod 6 of a hydraulic pneumatic cylinder. The fixed section consists of a cylinder body 6, a fixed lower foot tube 7, a fixed base 8, and a plastic protective cover for the base 9.

[0038] During implementation, the fixed base extends along the width of the panel 1, and the two ends of the fixed base are fitted with plastic protective sleeves 9 to achieve anti-slip and stable support effects.

[0039] During implementation, a control lever is provided at the bottom of the panel. The control lever is rotatably connected to the bottom of the panel and arranged opposite to the control switch 63. By pressing the control switch 63 with the control lever, the lifting and lowering control of the hydraulic pneumatic cylinder 6 is performed.

[0040] Furthermore, the hydraulic pneumatic cylinder 6 includes two cylinders, each disposed on one side of the bottom of the panel 1. The cylinder body 61 of each hydraulic pneumatic cylinder 6 is connected to the fixed lower foot tube 7 on the corresponding side, and the movable rod 62 is connected to the lifting connecting upper tube 5. The corresponding control lever is a linkage control lever 3, and the linkage switch has a U-shaped structure. The linkage control lever 3 is horizontally positioned in the middle and rotatably connected to the bottom of the panel 1. The two sides of the linkage control lever 3 are respectively driven connected to the control switch 63 on the corresponding side.

[0041] In the implementation process, hydraulic pneumatic cylinders are a mature and commonly used product, widely used in height-adjustable swivel chairs. The core structure consists of a cylinder, piston rod, high-pressure nitrogen, and control valve. The working principle is based on fluid mechanics and gas pressure. The cylinder is filled with high-pressure nitrogen (1-2 atmospheres) with a purity of >90%, and provides elastic support force through gas compressibility.

[0042] During operation, rotating the 3-linkage rotary control switch triggers the control switch of the movable rod, causing relative displacement between the movable rod and the cylinder. This creates relative displacement between the fixed and movable lifting parts of the desk, allowing for easy height adjustment. The process is as follows: Without pressure applied to the panel: Air pressure > seat weight, air pressure pushes the piston rod upward. When pressure is applied to the panel, the combined weight of the user and the seat > air pressure, causing the piston rod to descend at a constant speed until a new equilibrium position is reached. Releasing the control switch resets the valve plate, cutting off the channel. The locking force can reach over 10000N, achieving fixation at any position. Effortless and convenient lifting, one-button operation, no additional tools required.

[0043] The provided height-adjustable student desk features a stepless height adjustment mechanism, including a linear adjustment cylinder, between the panel 1 and the fixed base frame 8. The extension and retraction of the linear adjustment cylinder drives the upper lifting connecting tube to slide vertically relative to the fixed lower base tube, thereby adjusting the height of the panel. This forms a fully sealed transmission mechanism and a one-button operation design, solving the technical problems of difficult adjustment and easy damage of traditional height-adjustable desks. It enables tool-free and quick adjustment, making it convenient for students to use.

[0044] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A student desk with stepless height adjustment, characterized in that, include: The panel (1) has a fixed frame (2) and a storage drawer (4) connected to the bottom. The lifting connecting tube (5) includes two tubes symmetrically arranged on both sides of the bottom of the panel (1). The upper end of each lifting connecting tube (5) is connected to the fixed frame (2), and the lower end extends vertically downward. The fixed lower leg tube (7) includes two tubes, and the lower ends of the tubes are respectively connected to the fixed base frame (8). The upper end of each fixed lower leg tube (7) extends upward. The lower end of the lifting connecting upper tube (5) is slidably connected to the fixed lower leg tube (7). as well as The stepless lifting adjustment mechanism includes a linear adjustment cylinder disposed between the lifting connecting upper tube (5) and the fixed lower tube (7). The cylinder body (61) of the linear adjustment cylinder is connected to the fixed lower tube (7). The movable rod (62) of the linear adjustment cylinder extends upward and is connected to the lifting connecting upper tube (5) so that the lifting connecting upper tube (5) can be driven to slide vertically relative to the fixed lower tube (7) by the extension and retraction of the linear adjustment cylinder, thereby driving the panel (1) to lift and adjust.

2. The height-adjustable stepless student desk according to claim 1, characterized in that, The linear regulating cylinder is a hydraulic pneumatic cylinder (6). The cylinder body (61) of the hydraulic pneumatic cylinder (6) is connected to the fixed lower foot tube (7), and the movable rod (62) is connected to the lifting connecting upper tube (5).

3. The height-adjustable stepless student desk according to claim 2, characterized in that, The cylinder body (61) of the hydraulic pneumatic cylinder (6) is set inside the fixed lower foot tube (7), and the movable rod (62) passes through the lifting connection upper tube (5) and extends out of the upper end of the lifting connection upper tube (5).

4. The height-adjustable stepless student desk according to claim 3, characterized in that, The top of the movable rod (62) of the hydraulic pneumatic cylinder (6) is provided with a control switch (63). The top of the control switch (63) is spherical. The hydraulic pneumatic cylinder (6) is raised and lowered by the control switch (63).

5. The height-adjustable stepless student desk according to claim 1, characterized in that, The bottom of the panel is provided with a control lever, which is rotatably connected to the bottom of the panel and arranged opposite to the control switch (63). By pressing the control switch (63) with the control lever, the lifting and lowering control of the hydraulic pneumatic cylinder (6) is performed.

6. The height-adjustable stepless student desk according to claim 5, characterized in that, The hydraulic pneumatic cylinder (6) includes two cylinders, which are respectively located on the bottom sides of the panel (1). The cylinder body (61) of each hydraulic pneumatic cylinder (6) is connected to the fixed lower foot tube (7) on the corresponding side, and the movable rod (62) is connected to the lifting connecting upper tube (5).

7. The height-adjustable stepless student desk according to claim 5, characterized in that, The control lever is a linkage control lever (3), which has a U-shaped structure. The middle of the linkage control lever (3) is horizontally arranged and rotatably connected to the bottom of the panel (1). The two sides of the linkage control lever (3) are respectively driven and connected to the corresponding control switches (63).

8. The height-adjustable stepless student desk according to claim 1, characterized in that, The fixed base extends along the width of the panel (1), and the two ends of the fixed base are fitted with plastic protective sleeves (9).

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