Adjustable height-adjustable writing board

Abstract

We offer a writing board that allows for easy adjustment of height and angle. [Solution] The device includes a writing board 101, a bottom horizontal frame 102 symmetrically positioned below the writing board, and self-locking swivel casters 103 symmetrically positioned on the bottom surface of the bottom horizontal frame. A vertical sleeve 105 is fixed to the upper surface of the bottom horizontal frame, a bottom connecting frame 104 is fixedly connected between the bottom horizontal frames, a support plate 106 is provided below the writing board, a sliding tube 201 is provided inside the vertical sleeve, a first outer tube and a first inner tube are provided inside the sliding tube, a foldable telescopic tube is provided below the first outer tube, a connecting horizontal tube 202 is provided between the two sliding tubes, an adjustment block is provided inside the connecting horizontal tube, multiple passages are provided inside the adjustment block, a rotatable receiving box is fixedly connected to the top of the sliding tube, and an incomplete internal tooth ring and a toothed block are provided inside the rotatable receiving box.

Description

Technical Field

[0001] The present invention relates to the technical field of learning tools, and particularly to an adjustable lifting writing board.

Background Art

[0002] A writing board is usually a flat board that can be repeatedly written and erased and is used in scenes such as teaching and training. From a traditional perspective, teaching writing boards are not limited to blackboards and include various types of writing tools and materials.

[0003] The application of a writing board is usually divided into a writing stage and a display stage. In the writing stage, the most comfortable area for the writer to write is the area near the middle. When writing in a high or low area, the writer needs to bend down or stretch their arm, and will get tired after writing for a long time. Conventional writing boards need to be fixed to maintain their height and angle after adjustment, and the writer cannot easily adjust the height of the writing board when holding a pen, resulting in the defect that they cannot maintain a comfortable writing posture.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technical problem to be solved by the present invention is to provide an adjustable lifting writing board, which adjusts the height of the writing board by simultaneously adjusting the relative positions of a first outer tube and a first inner tube arranged in two vertical sleeves, and uses a knob arranged near the user's hand to lift, adjust the angle, and lock the device.

Means for Solving the Problems

[0005] To solve the above technical problems, the present invention adopts the following technical means.

[0006] An adjustable height-adjustable writing board, A writing board and A bottom horizontal frame symmetrically positioned below the aforementioned writing board, The bottom horizontal frame includes self-locking swivel casters arranged symmetrically on the bottom surface, A vertical sleeve is fixed to the upper surface of the bottom horizontal frame. A bottom connecting frame is fixedly connected between the aforementioned bottom horizontal frames. A support plate is provided below the aforementioned writing board, and further includes the following: A sliding tube is provided inside the vertical sleeve. The sliding tube body is provided with a first outer tube and a first inner tube inside. The first inner tube and the first outer tube are slidably connected and sealed. The two sets of the first outer tube and the first inner tube extend and retract simultaneously to raise and lower the lighting board. A foldable telescopic tube is provided below the first outer tube. The aforementioned foldable telescopic tube folds and extends to change the pressure of the liquid inside the first outer tube and the first inner tube, thereby causing the liquid inside the first outer tube and the first inner tube to flow. Furthermore, expansion and contraction occur between the first outer tube and the first inner tube, A connecting horizontal pipe is provided between the two aforementioned sliding pipe bodies. An adjustment block is provided inside the aforementioned connecting horizontal pipe. Multiple passages for allowing liquid to flow are provided inside the aforementioned adjustment block. Adjustment plugs are symmetrically arranged inside the adjustment block. A check valve for controlling the direction of liquid flow is attached to the surface of the adjustment plug. A rotatable receiving box is fixedly connected to the top of the aforementioned sliding tube. An incomplete internal tooth ring and a toothed block are provided inside the rotatable receiving box for adjusting the tilt angle of the lighting board.

[0007] Furthermore, a fixing sheet is fixedly connected inside the vertical sleeve. A first outer tube is fixedly connected to a first circular groove formed on the surface of the aforementioned fixing sheet. A sealed plug is sealed and slidably connected inside the first outer tube. The bottom of the first inner tube is fixedly connected to the upper surface of the sealing plug. The second inner tube is fixedly connected inside the second round groove opened on the upper surface of the first inner tube. The bottom of the second inner tube is located in a through-groove formed on the surface of the sealing plug. The second inner tube is fixedly connected to the sealed plug. Multiple water-conducting holes are uniformly provided on the surface of the first inner tube near the sealing plug. A support damping block is fixedly connected to the surface of the first outer tube. The support damping block is slidably connected to the sliding pipe, A filling support block is fixedly connected inside the sliding pipe body. The first inner tube is fixedly connected to a seventh circular groove opened in the bottom surface of the filling support block. Multiple fluid passage channels are provided inside the aforementioned filling support block.

[0008] Furthermore, an adjustment block is fixedly connected inside the connecting horizontal pipe. A symmetrical adjustment chamber is provided inside the aforementioned adjustment block. The adjustment plug is rotatably connected inside the adjustment chamber. Four first water channel grooves are symmetrically provided on the surface of the adjustment block. The two first water channels located on the same side communicate with the interior of the corresponding adjustment chamber. The check valve is fixedly connected to a third circular groove formed on the surface of the adjustment plug. One of the first water conduits located on the same side communicates with the interior of the corresponding first inner pipe via piping. The other first water conduit is connected to the interior of the corresponding second inner pipe via a pipe.

[0009] Furthermore, a connecting sheet is fixedly connected to the bottom surface of the fixed sheet, a bottom connecting sheet is provided below the connecting sheet, the folding telescopic tube is located between the connecting sheet and the bottom connecting sheet, the connecting sheet and the bottom connecting sheet are respectively fixedly connected into two openings of the folding telescopic tube, a fourth round groove communicating with the inside of the folding telescopic tube and the fixed sheet is opened on the surface of the connecting sheet, a plurality of spring rods are provided on the upper surface of the bottom connecting sheet, both ends of the spring rod are respectively fixedly connected to the connecting sheet and the bottom connecting sheet.

[0010] Furthermore, a restraint block is symmetrically and fixedly connected inside the bottom connecting frame, a rotating rod is rotatably connected into a restraint groove opened on the surfaces of the two restraint blocks, a foot pedal is fixedly connected to the surface of the rotating rod, the foot pedal is located in a movable groove opened on the surface of the bottom connecting frame, pressing blocks are respectively fixedly connected to both ends of the rotating rod, the pressing blocks are located inside the bottom horizontal frame.

[0011] Furthermore, an adjustment cavity is opened inside the adjustment block, the adjustment cavity communicates with the inside of the adjustment chamber, annular grooves are symmetrically opened inside the adjustment cavity, the adjustment chamber is respectively located inside the corresponding annular groove, sealing plugs are symmetrically arranged inside the adjustment cavity, the sealing plugs are rotatably connected into a first bearing and the corresponding annular groove through movable sealing rings, the sealing plugs are respectively fixedly connected to the corresponding adjustment plugs, a first gear is fixedly connected to the surface of the sealing plug, A second gear is meshed and connected between the two first gears. A connecting column is fixedly connected to the surface of the second gear. The connecting column is rotatably connected via a second bearing to a fifth circular groove formed on the surface of the connecting horizontal tube.

[0012] Furthermore, a knob is fixedly attached to the end of the connecting column. Multiple positioning tubes are fixed in an annular manner to the surface of the connecting horizontal tube. A third spring is placed inside the positioning tube. A positioning ball is slidably connected inside the positioning tube. Both ends of the third spring are fixedly connected to the third spring and the positioning ball, On the side of the knob closest to the connecting horizontal tube, a positioning groove is provided, the number of which corresponds to the positioning balls.

[0013] Furthermore, a position limiting sleeve is fixedly connected to the surface of the connecting horizontal pipe. A second spring is provided inside the position limiting sleeve. A position limiting slider is slidably connected inside the positioning sleeve. Both ends of the second spring are fixedly connected to the positioning sleeve and the position limiting slider, respectively. A restraining and pressing block is fixedly connected to the end of the second spring.

[0014] Furthermore, the incomplete internal tooth ring is rotatably connected inside the rotatable receiving box, Arc-shaped sliding grooves are provided on the surface of the rotatable receiving box. An arc-shaped slider is provided inside the aforementioned arc-shaped sliding groove. The arc-shaped slider is fixedly connected to the incomplete internal tooth ring. The arc-shaped slider is slidably connected to the rotatable receiving box via the arc-shaped sliding groove, A second connecting pipe is fixedly connected to the surface of the arc-shaped slider. The lighting board is rotatably connected to two of the second connecting tubes via two second bearings, The toothed block is connected to the incomplete internal tooth ring by engaging with it.

[0015] Furthermore, a rectangular sleeve is fixedly connected to the bottom surface of the toothed block. A sealed slider is slidably connected inside the rectangular sleeve. A first spring is provided inside the rectangular sleeve. Both ends of the first spring are fixedly connected to the sealed slider and the rectangular sleeve, respectively. Two second water channel grooves are provided on the surface of the adjustment block. The second water channel is connected via piping to the sealed slider located on the same side, The sealed slider is fixedly connected to an eighth through groove formed inside the rotatable receiving box. [Effects of the Invention]

[0016] The above technical solution of the present invention has the following advantageous effects.

[0017] The above technical solution of the present invention achieves height adjustment of the writing board by simultaneously adjusting the relative positions of a first outer tube and a first inner tube arranged in two vertical sleeves. The user can adjust the height while writing using an adjustment foot pedal located near the user's feet, and the device can be raised, the angle adjusted, and the device locked using a knob located near the user's hand. This allows the user to adjust the device while writing and maintain a relatively comfortable writing posture. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic diagram of the overall structure of the present invention. [Figure 2] This is a schematic diagram of the connecting horizontal pipe of the present invention. [Figure 3] This is a schematic diagram of the rotatable receiving box of the present invention. [Figure 4] This is a schematic diagram of the foot pedal of the present invention. [Figure 5] This is a schematic diagram of the toothed block of the present invention. [Figure 6] This is a schematic diagram of the adjustment plug of the present invention. [Figure 7] This is a schematic diagram showing the location of the first water channel of the present invention. [Figure 8] This is a schematic diagram of the sealed plug of the present invention. [Figure 9] This is an enlarged view of part A in Figure 2 of the present invention. [Figure 10] This is an enlarged view of part B in Figure 2 of the present invention. [Figure 11] This is an enlarged view of section C in Figure 3 of the present invention. [Figure 12] This is an enlarged view of section D in Figure 3 of the present invention. [Figure 13] This is an enlarged view of part E in Figure 4 of the present invention. [Figure 14] This is an enlarged view of section F in Figure 4 of the present invention. [Figure 15] This is an enlarged view of section G in Figure 4 of the present invention. [Modes for carrying out the invention]

[0019] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the drawings show exemplary embodiments of the present invention, the present invention can be realized in various forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to enable a more complete understanding of the present invention and to fully convey its scope to those skilled in the art.

[0020] As shown in Figure 1, an embodiment of the present invention provides an adjustable height-adjustable lighting board, comprising a lighting board 101, a bottom horizontal frame 102 symmetrically positioned below the lighting board 101, and self-locking swivel casters 103 symmetrically positioned on the bottom surface of the bottom horizontal frame 102, with a vertical sleeve 105 fixed to the upper surface of the bottom horizontal frame 102, a bottom connecting frame 104 fixedly connected between the bottom horizontal frames 102, and a support plate 106 provided below the lighting board 101.

[0021] As shown in Figures 1 to 15, the following is further included: a sliding tube 201 is provided inside the vertical sleeve 105; a first outer tube 213 and a first inner tube 212 are provided inside the sliding tube 201; the first inner tube 212 and the first outer tube 213 are slidably connected and sealed; and the lighting board 101 is raised and lowered by the simultaneous expansion and contraction of the two sets of first outer tubes 213 and first inner tubes 212.

[0022] A foldable telescopic tube 219 is provided below the first outer tube 213. The foldable telescopic tube 219 folds and expands to change the pressure of the internal liquid in the first outer tube 213 and the first inner tube 212, thereby causing the liquid inside the first outer tube 213 and the first inner tube 212 to flow, and also causing expansion and contraction between the first outer tube 213 and the first inner tube 212.

[0023] A connecting horizontal pipe 202 is provided between the two sliding pipe bodies 201, and an adjustment block 301 is provided inside the connecting horizontal pipe 202. Multiple passages for allowing liquid to flow are provided inside the adjustment block 301, and adjustment plugs 305 are symmetrically arranged inside the adjustment block 301. A check valve 306 for controlling the direction of liquid flow is attached to the surface of the adjustment plugs 305.

[0024] A rotatable receiving box 203 is fixedly connected to the top of the sliding tube 201, and an incomplete internal tooth ring 204 and a toothed block 208 are provided inside the rotatable receiving box 203 for adjusting the tilt angle of the lighting board 101.

[0025] In this embodiment, when adjusting the height of the lighting board 101, the first inner tube 212 and the first outer tube 213 are filled with liquid, and the first inner tube 212 inside the two sets of first outer tubes 213 is slid simultaneously by changing the pressure strength of the liquid inside both, thereby changing the height of the lighting board 101, changing the direction of the outlet end of the check valve 306 by rotating the adjustment plug 305, and further controlling the flow direction of the liquid in the two first water conduit grooves 302 located on the same side so that a change in extension or shortening occurs between the first inner tube 212 and the first outer tube 213, thereby controlling the inclination angle of the lighting board 101 by controlling the engagement and disengagement of the incomplete internal tooth ring 204 and the toothed block 208.

[0026] As shown in Figures 4, 11, 13, 14, and 15, a fixing sheet 217 is fixedly connected inside the vertical sleeve 105, a first outer tube 213 is fixedly connected inside a first round groove opened on the surface of the fixing sheet 217, a sealing plug 216 is sealed and slidably connected inside the first outer tube 213, the bottom of the first inner tube 212 is fixedly connected to the top surface of the sealing plug 216, a second inner tube 215 is fixedly connected inside a second round groove opened on the top surface of the first inner tube 212, and the bottom of the second inner tube 215 is inside a through round groove opened on the surface of the sealing plug 216 The second inner tube 215 is fixedly connected to a sealed plug 216, multiple water guide holes 222 are uniformly formed on the surface of the first inner tube 212 near the sealed plug 216, a support damping block 214 is fixedly connected to the surface of the first outer tube 213, the support damping block 214 is slidably connected to a sliding tube body 201, a filling support block 211 is fixedly connected inside the sliding tube body 201, the first inner tube 212 is fixedly connected to a seventh circular groove formed on the bottom surface of the filling support block 211, and multiple fluid passage grooves are formed inside the filling support block 211.

[0027] In this embodiment, when liquid flows from inside the second inner tube 215 to between the second inner tube 215 and the first inner tube 212 under the action of pressure, and also flows into the space between the first inner tube 212 and the first outer tube 213 through the water intake hole 222, the sealing plug 216 moves the first inner tube 212 downward relative to the first outer tube 213 due to the large upward liquid pressure. When the liquid flows in the reverse direction, the first inner tube 212 moves upward relative to the first outer tube 213, and as the first inner tube 212 moves, the filling support block 211, which is fixedly connected to the first inner tube 212 and the sliding tube body 201, simultaneously moves the sliding tube body 201 inside the vertical sleeve 105.

[0028] As shown in Figures 3, 6, 7, 8, 13 and 15, an adjustment block 301 is fixedly connected inside the connecting horizontal pipe 202, an adjustment chamber 303 is symmetrically opened inside the adjustment block 301, an adjustment plug 305 is rotatably connected inside the adjustment chamber 303, four first water conduit grooves 302 are symmetrically opened on the surface of the adjustment block 301, two first water conduit grooves 302 located on the same side communicate with the interior of the corresponding adjustment chamber 303, a check valve 306 is fixedly connected to a third round groove opened on the surface of the adjustment plug 305, one of the first water conduit grooves 302 located on the same side communicates with the interior of the corresponding first inner pipe 212 via piping, and the other first water conduit groove 302 communicates with the interior of the corresponding second inner pipe 215 via piping.

[0029] In this embodiment, when the adjustment plug 305 inside the adjustment chamber 303 is rotated and the adjustment plug 305 blocks the two corresponding first water channels 302, the liquid inside the second inner tube 215 and the liquid inside the first inner tube 212 no longer flow to each other, and the amount of liquid deformation due to pressure can be ignored. At this time, the relative position of the first outer tube 213 and the first inner tube 212 does not change easily, that is, the height of the lighting board 101 can be maintained. When the adjustment plug 305 is turned until the corresponding two first water channels 302 are not blocked, and the flow direction of the check valve 306 is such that the liquid flows from between the first inner pipe 212 and the second inner pipe 215 through the piping to the inlet end of the check valve 306, then flows to the outlet end of the check valve 306, and flows from the outlet end through the piping into the inside of the second inner pipe 215, the liquid between the first outer pipe 213 and the first inner pipe 212 located above the sealing plug 216 is reduced, and the sealing plug 216 pushes the second inner pipe 215 upward. At this time, if the adjustment plug 305 is turned 180°, the liquid flows in the opposite direction, and the sealing plug 216 pushes the second inner pipe 215 downward.

[0030] As shown in Figures 4 and 12, a connecting sheet 218 is fixedly connected to the bottom surface of the fixed sheet 217, a bottom connecting sheet 220 is provided below the connecting sheet 218, a foldable telescopic tube 219 is located between the connecting sheet 218 and the bottom connecting sheet 220, and the connecting sheet 218 and the bottom connecting sheet 220 are fixedly connected to the two openings of the foldable telescopic tube 219, a fourth circular groove is provided on the surface of the connecting sheet 218 that communicates with the inside of the foldable telescopic tube 219 and the fixed sheet 217, and a plurality of spring bars 221 are symmetrically provided on the upper surface of the bottom connecting sheet 220, with both ends of the spring bars 221 fixedly connected to the connecting sheet 218 and the bottom connecting sheet 220, respectively.

[0031] In this embodiment, the folding telescopic tube 219 is folded and contracted by pushing the bottom connecting sheet 220 upward, and the liquid stored inside the folding telescopic tube 219 is pushed into the first outer tube 213 through the fourth round groove on the surface of the connecting sheet 218. When the liquid in the second inner tube 215 flows between the first inner tube 212 and the first outer tube 213 due to the direction of the outlet end of the check valve 306, the liquid pushed into the first outer tube 213 from the folding telescopic tube 219 is sealed. The liquid enters the second inner pipe 215 through the through-groove at the bottom of the plug 216, and then enters the side of the check valve 306 in the adjustment chamber 303 located at the water inlet end via the piping, passes through the side of the check valve 306 inside the adjustment chamber 303 located at the water outlet end, then enters the space between the first inner pipe 212 and the second inner pipe 215 via the piping, and then enters the space between the first inner pipe 212 and the first outer pipe 213 through the water inlet hole 222, causing the liquid level between the first inner pipe 212 and the first outer pipe 213 to increase. As a result, the sealing plug 216 pushes the first inner tube 212, moving it downward inside the first outer tube 213, and as the liquid flows from between the first inner tube 212 and the first outer tube 213 into the second inner tube 215 due to the direction of the outlet end of the check valve 306, the sealing plug 216 pushes the first inner tube 212, moving it upward inside the first outer tube 213, and as the pressing of the folding telescopic tube 219 ends, the elastic potential energy of the spring bar 221 moves the bottom connecting sheet 220 away from the connecting sheet 218, and at this time the check valve When the liquid in the second inner pipe 215 flows between the first inner pipe 212 and the first outer pipe 213 due to the direction of the outlet end of the valve 306, the sealing plug 216 continues to move downward inside the first outer pipe 213 due to the return water absorption of the foldable telescopic pipe 219 until the foldable telescopic pipe 219 returns to its original position. When the liquid flows from between the first inner pipe 212 and the first outer pipe 213 into the second inner pipe 215 due to the direction of the outlet end of the check valve 306, the sealing plug 216 continues to move upward inside the first outer pipe 213 due to the return water absorption of the foldable telescopic pipe 219.

[0032] As shown in Figure 4, restraint blocks 501 are symmetrically fixed inside the bottom connecting frame 104, a rotating rod 502 is rotatably connected to restraint grooves opened on the surfaces of the two restraint blocks 501, a foot pedal 503 is fixedly connected to the surface of the rotating rod 502, the foot pedal 503 is located in an action groove opened on the surface of the bottom connecting frame 104, and a pressing block 504 is fixedly connected to each end of the rotating rod 502, the pressing block 504 is located inside the bottom horizontal frame 102.

[0033] In this embodiment, when compressing the foldable telescopic tube 219, pressing the foot pedal 503 rotates the rotating rod 502 by a certain angle inside the restraining block 501, thereby pushing the bottom connecting sheet 220 in the direction of compressing the foldable telescopic tube 219 as the pressing block 504 rotates following the rotating rod 502. When the foot is released from the foot pedal 503, the bottom connecting sheet 220 pushes the pressing block 504 downward due to the elastic potential energy of the spring bar 221, causing the pressing block 504 to move the rotating rod 502 back to its original position, that is, to release the foot pedal 503. By periodically pressing the foot pedal 503, the foldable telescopic tube 219 can be periodically extended and retracted, making it easy to adjust the height of the writing board 101.

[0034] As shown in Figures 6, 7, 8 and 10, an adjustment cavity 308 is provided inside the adjustment block 301, the adjustment cavity 308 communicates with the inside of the adjustment chamber 303, annular grooves are provided symmetrically inside the adjustment cavity 308, the adjustment chamber 303 is located inside the corresponding annular groove, a sealing plug 307 is symmetrically arranged inside the adjustment cavity 308, the sealing plug 307 is rotatably connected to the first bearing and the corresponding annular groove via a movable seal ring, the sealing plug 307 is fixedly connected to the corresponding adjustment plug 305, a first gear 309 is fixedly connected to the surface of the sealing plug 307, a second gear 310 is meshed and connected between the two first gears 309, a connecting column 311 is fixedly connected to the surface of the second gear 310, and the connecting column 311 is rotatably connected to a fifth round groove provided on the surface of the connecting horizontal tube 202 via a second bearing.

[0035] A knob 405 is fixedly connected to the end of the connecting column 311, multiple positioning tubes 408 are fixed in an annular manner to the surface of the connecting horizontal tube 202, a third spring 409 is placed inside the positioning tube 408, a positioning ball 406 is slidably connected inside the positioning tube 408, both ends of the third spring 409 are fixedly connected to the third spring 409 and the positioning ball 406 respectively, and positioning grooves 407 are provided on the side of the knob 405 closest to the connecting horizontal tube 202, the number of which corresponds to the positioning ball 406.

[0036] In this embodiment, turning the knob 405 moves the connecting column 311 by a certain angle by the second gear 310, and the transmission of the two first gears 309 moves the corresponding sealing plug 307 by a certain angle by the adjustment plug 305, thereby adjusting the positional relationship between the adjustment plug 305 and the first water channel 302 and the direction of the outlet end of the check valve 306, making it easy to adjust the positional relationship between the first inner pipe 212 and the first outer pipe 213, and further allowing the height of the lighting board 101 to be adjusted. When the knob 405 is turned, the elastic potential energy of the third spring 409 causes the positioning ball 406 inside the positioning pipe 408 to slide out from inside the positioning groove 407, generating rotational resistance of the knob 405, allowing the worker to easily detect the rotation of the knob 405 and position it, and further reflecting the direction of the check valve 306.

[0037] As shown in Figures 2 and 9, a position limiting sleeve 401 is fixedly connected to the surface of the connecting horizontal tube 202, a second spring 402 is provided inside the position limiting sleeve 401, a position limiting slider 403 is slidably connected inside the positioning sleeve 401, both ends of the second spring 402 are fixedly connected to the positioning sleeve 401 and the position limiting slider 403 respectively, and a restraining pressing block 404 is fixedly connected to the end of the second spring 402.

[0038] In this embodiment, when the lighting board 101 is rotated so that its bottom edge is in the groove on the surface of the restraint pressing block 404, the bottom edge of the lighting board 101 first slides toward the groove along one of the slopes of the restraint pressing block 404, moving the restraint pressing block 404 and the position limiting slider 403 in the direction of compressing the second spring 402 until the bottom edge of the lighting board 101 is embedded in the groove of the restraint pressing block 404. At this time, the lighting board 101 is fixed by the elastic potential energy of the second spring 402. When the lighting board 101 is reversed, it continues to rotate, overcoming the elastic potential energy of the second spring 402 and sliding out of the groove along the groove surface of the restraint pressing block 404, and sliding along the other slope of the restraint pressing block 404 until the top edge of the lighting board 101 is rotated within the groove.

[0039] As shown in Figures 4, 5, 7, 8 and 13, the incomplete internal tooth ring 204 is rotatably connected inside the rotatable receiving box 203, an arc-shaped sliding groove 205 is provided on the surface of the rotatable receiving box 203, an arc-shaped slider 206 is provided inside the arc-shaped sliding groove 205, the arc-shaped slider 206 is fixedly connected to the incomplete internal tooth ring 204, the arc-shaped slider 206 is slidably connected to the rotatable receiving box 203 via the arc-shaped sliding groove 205, a second connecting pipe 207 is fixedly connected to the surface of the arc-shaped slider 206, the lighting board 101 is rotatably connected to the two second connecting pipes 207 via two second bearings, and the toothed block 208 is connected to the incomplete internal tooth ring 204 by meshing with it.

[0040] A rectangular sleeve 209 is fixedly connected to the bottom surface of the toothed block 208, a sealed slider 210 is slidably connected inside the rectangular sleeve 209, a first spring 223 is provided inside the rectangular sleeve 209, both ends of the first spring 223 are fixedly connected to the sealed slider 210 and the rectangular sleeve 209, respectively, two second water conduit grooves 304 are provided on the surface of the adjustment block 301, the second water conduit grooves 304 communicate with the sealed slider 210 located on the same side via piping, and the sealed slider 210 is fixedly connected in an eighth through groove provided inside the rotation receiving box 203.

[0041] In this embodiment, when the two adjustment plugs 305 rotate simultaneously until the second water channel 304 is blocked, the liquid inside the sealed slider 210 and rectangular sleeve 209 cannot flow into the adjustment chamber 303, and relative movement between the rectangular sleeve 209 and the sealed slider 210 becomes less likely. That is, the toothed block 208 remains engaged with the incomplete internal tooth ring 204 throughout, and at this time, the second connecting pipe 207, which is fixedly connected to the incomplete internal tooth ring 204 via the arc-shaped slider 206, cannot rotate around the central axis of the incomplete internal tooth ring 204, meaning that the lighting board 101 cannot be reversed. When the adjustment plugs 305 do not block the second water channel 304, the surface of the teeth of the toothed block 208 pushes the second connecting pipe 207 with an external force until it slides relative to the teeth of the incomplete internal tooth ring 204, causing the incomplete internal tooth ring 204 to tend to rotate inside the rotation receiving box 203. As a result, relative motion occurs between the rectangular sleeve 209 and the sealed slider 210 in a direction that compresses the first spring 223, causing the liquid inside the rectangular sleeve 209 and sealed slider 210 to flow through the piping into the corresponding adjustment chamber 303. When the toothed block 208 re-engages with the teeth of the incomplete internal tooth ring 204, the elastic potential energy of the first spring 223 causes the rectangular sleeve 209 and sealed slider 210 to return to their original position, recirculating the liquid inside the corresponding adjustment chamber 303 through the second water channel 304 and the piping into the rectangular sleeve 209 and sealed slider 210.

[0042] Operating principle: When using, rotate the knob 405 to rotate the adjustment plug 305 until it does not block the first water guide groove 302, and press the foot pedal 503 to adjust the writing board 101 to the appropriate position. After writing in an area that is comfortable for the user, press the foot pedal 503 to raise or lower the writing board 101 to a certain height, so that you can always write in an area that is comfortable for writing. After writing is finished, when displaying the contents on the writing board 101, rotate the adjustment plug 305 until it does not block the second water guide groove 304. At this time, the second connecting tube 207 rotates around the rotation receiving box 203 at an appropriate angle, and the bottom edge of the writing board 101 remains within the groove of the restraining pressure block 404 at all times. The elastic potential energy of the second spring 402 maintains that the relative position between the writing board 101 and the second connecting tube 207 does not change, and when the first connecting tube 207 rotates, the light The lighting board 110 rotates in accordance with the rotation of the second connecting pipe 207. After rotating the lighting board 110 to the appropriate position, turning the knob 405 to block the second water channel 304 via the adjustment plug 305 allows the lighting board 101 to be held in place and fixed. If the contents written on the lighting board 101 are to be displayed for a long period of time, the adjustment plug 305 can be rotated until both the first water channel 302 and the adjustment plug 305 are blocked simultaneously, thereby maintaining the lighting board 101 in a fixed state for an extended period.

[0043] Furthermore, the bottom horizontal frame 102, bottom connecting frame 104, vertical sleeve 105, and connecting horizontal pipe 202 are all tubular, making it convenient to install parts inside them. Due to the frictional force between the support damping block 214 and the sliding pipe body 201, the influence of the sliding pipe body 201 and its applied gravity on the liquid pressure inside the first outer pipe 213 is small, and when the adjustment plug 305 is not blocking the first water guide groove 302, a relative static state is maintained between the second connecting pipe 207 and the vertical sleeve 105, making it easy to adjust the height and angle of the lighting board 101. Changes in the total liquid volume inside the rectangular sleeve 209 and the sealed slider 210 can be balanced by giving the sealed plug 216 a certain deformation capacity, without affecting its sealing performance, thereby balancing the increase or decrease in liquid inside the rectangular sleeve 209, the sealed slider 210, and the adjustment block 301. The angle between the second connecting pipe 207 and the vertical is 30° or less, thereby allowing the restraining pressure block 404 to effectively restrict the lighting board 101. The surface of the rotating rod 502 has a convex ring, which sandwiches the two restraining blocks 501, preventing the rotating rod 502 and the restraining blocks 501 from moving upward along the axial direction of the rotating rod 502. Regarding the use of the piping in this device, connections are made using the attached screw grooves, or the pipe openings are fixed in pre-prepared grooves. If it is necessary to penetrate the surface of a component, penetration is achieved by creating a pre-groove, and the liquid inside the piping can be sealed using sealant. The method of using the piping is prior art and will not be explained further here. When the piping penetrates the pre-groove inside the filling support block 211, it is fixedly connected to the filling support block 211, and the filling support block 211 provides support for the piping. The vertical sleeve 105 communicates with the inside of the bottom horizontal frame 102, thereby pressing the pressure block 504 against the bottom connecting sheet 220. The sliding pipe 201 is slidably connected to the vertical sleeve 105, thereby allowing the lighting board 101 to be raised and lowered stably.

[0044] The above is a preferred embodiment of the present invention, and those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also covered by the present invention. [Explanation of symbols]

[0045] 101: Lighting board, 102: Bottom horizontal frame, 103: Self-locking swivel caster, 104: Bottom connecting frame, 105: Vertical sleeve, 106: Support plate, 201: Sliding tube body, 202: Connecting horizontal tube, 203: Rotatable receiving box, 204: Incomplete internal tooth ring, 205: Arc-shaped sliding groove, 206: Arc-shaped slider, 207: Second connecting tube, 208: Toothed block, 209: Rectangular sleeve, 210: Sealed slider, 211: Filled support block, 212: First inner tube, 213: First outer tube, 214: Support damping block, 215: Second inner tube, 216: Sealed plug, 217: Fixing sheet, 218: Connecting sheet, 219: Foldable telescopic tube, 22 0: Bottom connecting sheet, 221: Spring bar, 222: Water guide hole, 223: First spring, 301: Adjustment block, 302: First water guide groove, 303: Adjustment chamber, 304: Second water guide groove, 305: Adjustment plug, 306: Check valve, 307: Sealing plug, 308: Adjustment cavity, 309: First gear, 310: Second gear, 311: Connecting column, 401: Position limiting sleeve, 402: Second spring, 403: Position limiting slider, 404: Restraining pressure block, 405: Knob, 406: Positioning ball, 407: Positioning groove, 408: Positioning tube, 409: Third spring, 501: Restraining block, 502: Rotating rod, 503: Foot pedal, 504: Pressure block

Claims

1. An adjustable height-adjustable writing board, Writing board (101), A bottom horizontal frame (102) is symmetrically positioned below the writing board (101), The bottom horizontal frame (102) includes a self-locking swivel caster (103) symmetrically arranged on the bottom surface, A vertical sleeve (105) is fixed to the upper surface of the bottom horizontal frame (102). A bottom connecting frame (104) is fixedly connected between the bottom horizontal frames (102). A support plate (106) is provided below the lighting board (101), and further includes the following: A sliding tube (201) is provided inside the vertical sleeve (105). Inside the sliding tube body (201) are provided a first outer tube (213) and a first inner tube (212). The first inner tube (212) and the first outer tube (213) are slidably connected and sealed. The two sets of the first outer tubes (213) and the first inner tubes (212) extend and retract simultaneously, thereby raising and lowering the lighting board (101). A foldable telescopic tube (219) is provided below the first outer tube (213). The aforementioned foldable telescopic tube (219) folds and extends to change the pressure strength of the internal liquid in the first outer tube (213) and the first inner tube (212), This causes the liquid inside the first outer tube (213) and the first inner tube (212) to flow, Furthermore, expansion and contraction occur between the first outer tube (213) and the first inner tube (212), A connecting horizontal pipe (202) is provided between the two sliding pipe bodies (201). An adjustment block (301) is provided inside the connecting horizontal pipe (202). Multiple passages for allowing liquid to flow are provided inside the adjustment block (301). Inside the adjustment block (301), adjustment plugs (305) are arranged symmetrically. A check valve (306) for controlling the direction of liquid flow is attached to the surface of the adjustment plug (305). A rotatable receiving box (203) is fixedly connected to the top of the sliding pipe body (201). An adjustable height-adjustable lighting board, wherein an incomplete internal tooth ring (204) and a toothed block (208) for adjusting the tilt angle of the lighting board (101) are provided inside the rotatable receiving box (203).

2. A fixing sheet (217) is fixedly connected inside the vertical sleeve (105). A first outer tube (213) is fixedly connected to a first circular groove formed on the surface of the aforementioned fixing sheet (217). A sealed plug (216) is sealed and slidably connected inside the first outer tube (213). The bottom of the first inner tube (212) is fixedly connected to the upper surface of the sealing plug (216), A second inner tube (215) is fixedly connected inside a second circular groove opened on the upper surface of the first inner tube (212). The bottom of the second inner tube (215) is located in a through-groove formed on the surface of the sealing plug (216), The second inner tube (215) is fixedly connected to the sealed plug (216), Multiple water-conducting holes (222) are uniformly provided on the surface of the first inner pipe (212) near the sealing plug (216). A support damping block (214) is fixedly connected to the surface of the first outer tube (213). The support damping block (214) is slidably connected to the sliding pipe (201), A filling support block (211) is fixedly connected inside the sliding pipe body (201). The first inner tube (212) is fixedly connected to a seventh circular groove opened in the bottom surface of the filling support block (211). The adjustable liftable lighting board according to claim 1, wherein a plurality of liquid passage grooves are provided inside the filling support block (211).

3. An adjustment block (301) is fixedly connected inside the aforementioned connecting horizontal pipe (202). Adjustment chambers (303) are symmetrically arranged inside the adjustment block (301). The adjustment plug (305) is rotatably connected inside the adjustment chamber (303), Four first water channel grooves (302) are symmetrically provided on the surface of the adjustment block (301). The two first water channels (302) located on the same side communicate with the interior of the corresponding adjustment chamber (303), The check valve (306) is fixedly connected to a third circular groove formed on the surface of the adjustment plug (305). One of the first water conduits (302) located on the same side is connected to the interior of the corresponding first inner pipe (212) via piping. The adjustable lifting lighting board according to claim 2, wherein the other first water channel (302) communicates with the interior of the corresponding second inner pipe (215) via piping.

4. A connecting sheet (218) is fixedly connected to the bottom surface of the fixed sheet (217). A bottom connecting sheet (220) is provided below the aforementioned connecting sheet (218). The aforementioned foldable telescopic tube (219) is located between the connecting sheet (218) and the bottom connecting sheet (220). The connecting sheet (218) and the bottom connecting sheet (220) are fixedly connected within the two openings of the foldable telescopic tube (219), A fourth circular groove is provided on the surface of the connecting sheet (218) that communicates with the inside of the foldable telescopic tube (219) and the fixing sheet (217). Multiple spring bars (221) are symmetrically provided on the upper surface of the bottom connecting sheet (220). The adjustable height-adjustable lighting board according to claim 3, wherein both ends of the spring bar (221) are fixedly connected to the connecting sheet (218) and the bottom connecting sheet (220), respectively.

5. The restraining blocks (501) are symmetrically fixed and connected inside the bottom connecting frame (104). A rotating rod (502) is rotatably connected to a restraining groove formed on the surface of the two restraining blocks (501). A foot pedal (503) is fixedly connected to the surface of the rotating rod (502). The foot pedal (503) is located in an activity groove provided on the surface of the bottom connecting frame (104). Pressing blocks (504) are fixedly connected to both ends of the rotating rod (502). The adjustable height-adjustable lighting board according to claim 4, wherein the pressing block (504) is located inside the bottom horizontal frame (102).

6. An adjustment cavity (308) is provided inside the adjustment block (301). The adjustment cavity (308) communicates with the inside of the adjustment chamber (303), An annular groove is symmetrically formed inside the adjustment cavity (308). Each of the adjustment chambers (303) is located inside the corresponding annular groove. A sealed plug (307) is symmetrically arranged inside the adjustment cavity (308). The sealed plug (307) is rotatably connected to the first bearing and in a corresponding annular groove via a movable seal ring. Each of the sealed plugs (307) is fixedly connected to a corresponding adjustment plug (305). A first gear (309) is fixedly connected to the surface of the sealed plug (307). A second gear (310) is meshed and connected between the two first gears (309). A connecting column (311) is fixedly connected to the surface of the second gear (310). The adjustable height-adjustable lighting board according to claim 5, wherein the connecting column (311) is rotatably connected via a second bearing to a fifth circular groove formed on the surface of the connecting horizontal tube (202).

7. A knob (405) is fixedly connected to the end of the connecting column (311). Multiple positioning tubes (408) are fixed in an annular manner to the surface of the connecting horizontal tube (202). A third spring (409) is placed inside the positioning tube (408). A positioning ball (406) is slidably connected inside the positioning tube (408). Both ends of the third spring (409) are fixedly connected to the third spring (409) and the positioning ball (406), An adjustable height-adjustable lighting board according to claim 6, wherein a positioning groove (407) is provided on the side of the knob (405) closest to the connecting horizontal tube (202), the number of which corresponds to the positioning ball (406).

8. A position limiting sleeve (401) is fixedly connected to the surface of the connecting horizontal pipe (202). A second spring (402) is provided inside the position limiting sleeve (401). A position limiting slider (403) is slidably connected inside the positioning sleeve (401), and both ends of the second spring (402) are fixedly connected to the positioning sleeve (401) and the position limiting slider (403), respectively. An adjustable height-adjustable lighting board according to claim 7, wherein a restraining pressure block (404) is fixedly connected to the end of the second spring (402).

9. The incomplete internal tooth ring (204) is rotatably connected inside the rotatable receiving box (203), An arc-shaped sliding groove (205) is provided on the surface of the rotatable receiving box (203). An arc-shaped slider (206) is provided inside the arc-shaped sliding groove (205). The arc-shaped slider (206) is fixedly connected to the incomplete internal tooth ring (204), The arc-shaped slider (206) is slidably connected to the rotatable receiving box (203) via the arc-shaped sliding groove (205), A second connecting pipe (207) is fixedly connected to the surface of the arc-shaped slider (206). The lighting board (101) is rotatably connected to two of the second connecting tubes (207) via two second bearings. The toothed block (208) is connected to the incomplete internal tooth ring (204) by interlocking, the adjustable height-adjustable writing board according to claim 8.

10. A rectangular sleeve (209) is fixedly connected to the bottom surface of the toothed block (208). A sealed slider (210) is slidably connected inside the rectangular sleeve (209). A first spring (223) is provided inside the rectangular sleeve (209). Both ends of the first spring (223) are fixedly connected to the sealed slider (210) and the rectangular sleeve (209), respectively. Two second water channel grooves (304) are provided on the surface of the adjustment block (301). The second water channel (304) is connected via piping to the sealed slider (210) located on the same side, The adjustable height-adjustable lighting board according to claim 9, wherein the sealed slider (210) is fixedly connected to an eighth through groove formed inside the rotatable receiving box (203).

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