A manual rotatable screen lifter

Abstract

The present application relates to a manual rotatable screen lifter, belonging to the technical field of multimedia manual adjustment equipment. It includes a storage box, a multimedia mechanism, a lifting mechanism, and a limiting mechanism. The storage box is hollow, and the multimedia mechanism includes a rotatable screen; the lifting mechanism is arranged in the storage box, the lifting mechanism is connected to the multimedia mechanism, and the lifting mechanism is used to drive the multimedia mechanism to rise and fall; the limiting mechanism includes an upper limit assembly and a lower limit assembly, both of which are arranged in the storage box, the upper limit assembly is arranged above the lower limit assembly, and both the upper limit assembly and the lower limit assembly can be selectively engaged with the lifting mechanism. The upper limit assembly is used to limit the downward movement of the multimedia mechanism after the multimedia mechanism rises, and the lower limit assembly is used to limit the upward movement of the multimedia mechanism after the multimedia mechanism descends. The lifting mechanism and the limiting mechanism are both manually adjustable. The present application can improve the problem of poor adjustment reliability of multimedia equipment.

Description

Technical Field

[0001] The present application relates to the technical field of multimedia manual adjustment equipment, and in particular to a manually rotatable screen lifter. Background Art

[0002] The prevalence of multimedia devices has greatly enriched people's lives and work styles. Whether it's home entertainment or commercial presentations, multimedia technology is indispensable. As society's demand for information interaction grows, the functionality and flexibility of multimedia devices are becoming core factors that users pay attention to.

[0003] At present, most of the screens of multimedia devices are driven by motors to be raised and lowered. Generally, one or more motors are required to adjust the screen height by controlling the motors and hardware components.

[0004] However, the motor-driven method is more prone to failure during use. When a failure occurs, such as damage to the motor or some components, the entire device will become unusable. At this time, the screen height cannot be adjusted, thus affecting the operator's use during meetings.

[0005] The above-mentioned related technologies have the defect of poor reliability in multimedia device adjustment. Summary of the Invention

[0006] In order to improve the problem of poor reliability in adjustment of multimedia devices, the present application provides a manually rotatable screen lifter.

[0007] The manual rotatable screen lifter provided in this application adopts the following technical solutions:

[0008] A manual rotatable screen lifter comprises: a accommodating box, which is hollow; a multimedia mechanism, which includes a rotatable screen; a lifting mechanism, which is arranged in the accommodating box, the lifting mechanism is connected to the multimedia mechanism, and the lifting mechanism is used to drive the multimedia mechanism to rise and fall; a limiting mechanism, the limiting mechanism comprises an upper limit component and a lower limit component, both of which are arranged in the accommodating box, the upper limit component is arranged above the lower limit component, and both of the upper limit component and the lower limit component can be selectively engaged with the lifting mechanism, the upper limit component is used to limit the downward movement of the multimedia mechanism after the multimedia mechanism rises, and the lower limit component is used to limit the upward movement of the multimedia mechanism after the multimedia mechanism descends, and the lifting mechanism and the limiting mechanism are both manually adjusted.

[0009] By adopting the above technical solution, the manual rotatable screen lifter can achieve height adjustment of multimedia equipment and ensure that the equipment is stably fixed at the required height. Specifically, the storage box serves as the basic carrier of the entire structure, and the internal integrated lifting mechanism allows the rotatable screen of the multimedia mechanism to rise or fall flexibly, thereby adapting to the use requirements in different scenarios. At the same time, the upper limit assembly and the lower limit assembly in the limit mechanism respectively lock the multimedia mechanism in both directions during the lifting process to prevent it from accidentally moving, thereby ensuring the safety and stability of the equipment. This design effectively solves the problem that traditional fixed installation methods cannot meet diverse height requirements. At the same time, the method of manually adjusting the mechanical structure also alleviates the problem of poor reliability of motor drive and improves the user experience.

[0010] Optionally, the lifting mechanism includes a guide frame, a vertical sliding member, an upper elastic member and a lower elastic member, the upper and lower ends of the guide frame are connected to the side walls of the storage box, the vertical sliding member is slidably connected to the guide frame, the multimedia mechanism is connected to the vertical sliding member, the upper end of the upper elastic member is connected to the upper end of the guide frame, the lower end of the upper elastic member can abut against the upper end of the vertical sliding member, the lower end of the lower elastic member is connected to the lower end of the guide frame, and the upper end of the lower elastic member can abut against the lower end of the vertical sliding member.

[0011] By adopting the above technical solution, the multimedia mechanism achieves stable vertical lifting and lowering. Specifically, the guide frame provides a stable sliding path for the vertical slide, ensuring that the multimedia mechanism does not deflect during lifting and lowering. The coordinated use of the upper and lower elastic members not only provides support for the vertical and horizontal movement of the multimedia mechanism, but also maintains its position when it stops, preventing position changes caused by external vibrations or other factors.

[0012] The lifting mechanism comprises a lifting mechanism, and the lifting mechanism comprises a lifting mechanism, and the lifting mechanism comprises a lower lifting mechanism, a lower lifting mechanism and a lower lifting mechanism. The lifting mechanism comprises a lifting mechanism, a lower lifting mechanism and a lower lifting mechanism. The lifting mechanism comprises a lifting mechanism, a lower lifting mechanism and a lower lifting mechanism. The lifting mechanism comprises a lifting mechanism, a lower lifting mechanism and a lower lifting mechanism. The lifting mechanism is a bottom end of the lifting mechanism, and the lifting mechanism is a bottom end of the lifting mechanism, and the lifting mechanism is a bottom end of the lifting mechanism.

[0013] By adopting the above technical solution, the design of the upper transverse sliding member and the upper transverse elastic member ensures that the upper limit assembly can stably clamp the lifting mechanism, thereby preventing the multimedia mechanism from accidentally moving downward; at the same time, through the action of the linkage assembly, this clamping state can be easily released, so that the multimedia mechanism can freely adjust the height when needed; the functions of the lower transverse sliding member and the lower transverse elastic member are similar to those above, they ensure the effective operation of the lower limit assembly, that is, after the multimedia mechanism descends to the specified position, it effectively prevents it from rebounding upward, and the restriction can also be released through simple operation using the linkage assembly; the existence of the linkage assembly greatly simplifies the operator's operating process, and only the same action is required to affect the status of the upper limit assembly and the lower limit assembly, thereby improving the convenience and efficiency of equipment use.

[0014] Optionally, the linkage assembly includes a linkage member, a longitudinal fixing member and a longitudinal elastic member, the first end of the linkage member passes through and extends out of the top of the containing box, the second end of the linkage member extends vertically into the containing box, the vertical length of the linkage member is greater than the vertical distance between the upper limit assembly and the lower limit assembly, the longitudinal fixing member is connected to the containing box, the linkage member is slidably connected to the longitudinal fixing member, one end of the longitudinal elastic member is connected to the longitudinal fixing member, and the other end of the longitudinal elastic member is connected to the linkage member, so that the pressure on the first end of the linkage member can be reset and moved upward after the pressure is released, the linkage member is provided with a pushing slot, and the upper push member and the lower push member are both provided with a pushing inclined surface, the upper end surface of the pushing slot abuts the pushing inclined surface, so that the vertical downward movement of the linkage member can drive the upper push member and the lower push member to move horizontally.

[0015] By adopting the above-mentioned technical solution, the manual rotatable screen lifter can achieve precise limiting and rapid release of the multimedia mechanism, optimize the force transmission efficiency during the limiting and unlocking process, and reduce unnecessary energy loss. Specifically, the design of the linkage allows the user to drive the pusher to move horizontally with a simple vertical downward pressure, thereby releasing the engagement state between the upper limit component or the lower limit component and the lifting mechanism, facilitating further manual adjustment of the height of the multimedia mechanism. At the same time, the presence of the longitudinal elastic member ensures the automatic reset function after the pressure is released, improving the convenience of operation. This design not only simplifies the user's operating process, but also improves the stability and reliability of the device.

[0016] Optionally, the vertical sliding member is provided with an upper protruding member and a lower protruding member, and the second end of the upper transverse sliding member is provided with a first inclined surface, the first inclined surface makes the upper end length of the upper transverse sliding member greater than the lower end length, the first inclined surface can slidably cooperate with the upper protruding member, and the upper protruding member can be clamped with the first inclined surface of the upper transverse sliding member, and the second end of the lower transverse sliding member is provided with a second inclined surface, the second inclined surface makes the upper end length of the lower transverse sliding member less than the lower end length, the second inclined surface can slidably cooperate with the lower protruding member, and the lower protruding member can be clamped with the first inclined surface of the lower transverse sliding member.

[0017] By adopting the above-mentioned technical solution, the upper and lower protrusions on the vertical slide respectively cooperate with the first inclined surface of the upper transverse slide and the second inclined surface of the lower transverse slide, enabling the multimedia mechanism to achieve an automatic locking function during the lifting process. Specifically, when the multimedia mechanism rises, the upper protrusion can push the first inclined surface to move below the upper transverse slide and engage with the first inclined surface of the upper transverse slide, forming an upper limit lock. When the multimedia mechanism descends, the lower protrusion can push the second inclined surface to move above the lower transverse slide and engage with the second inclined surface of the lower transverse slide, forming a lower limit lock. This design not only improves the safety of the device, but also enhances the structural stability and avoids accidental movement due to external vibration or misoperation.

[0018] Optionally, a buffer mechanism is also included, which includes a damper, a bearing, a gear and a rack. The damper is connected to the vertical sliding member, the bearing is sleeved on the damper, the gear is sleeved on the bearing, the rack is connected to the accommodating box, the rack extends vertically, the gear is engaged with the rack, and the damper damps the vertical sliding member when it moves downward relative to the rack.

[0019] By employing this technical solution, the manually rotatable screen lifter effectively cushions the descent of the multimedia mechanism. Specifically, the meshing structure of the gear and rack ensures the precision and reliability of the vertical slider's movement. Furthermore, the damper connected to the gear provides stable resistance during the multimedia mechanism's descent, preventing operational instability or damage caused by excessive descent speeds.

[0020] Optionally, the multimedia mechanism includes a first support member, a second support member, a rotating member, a disc damper and a base plate, the base plate is connected to the vertical sliding member, the lower end of the first support member is rotatably connected to the base plate, the second support member is rotatably connected to the upper end of the first support member, the disc damper is fixedly connected to the rotating member, so that the disc damper is rotatably connected to the second support member through the rotating member, the rotatable screen is connected to the disc damper, so that the rotatable screen can switch between horizontal and vertical states in a vertical plane, and the rotatable screen can move in space through the rotation of the two ends of the first support member, and the rotation between the first support member and the base plate and the rotation between the first support member and the second support both have a damping effect.

[0021] By adopting the above technical solution, the multimedia mechanism can achieve multi-angle adjustment and maintain stability. Specifically, the rotational connection between the first support member and the base plate and the rotational connection between the first support member and the second support member both have a damping effect, which allows the user to easily adjust the rotation angle and spatial position of the rotatable screen and maintain the current position after letting go. At the same time, the disc damping further enhances the stability of the rotatable screen during rotation through the connection between the rotating member and the second support member, avoiding position changes caused by slight external disturbances. This design fully meets the user's needs for angle adjustment of multimedia devices in different scenarios, and improves the convenience and experience of use.

[0022] Optionally, the second support member is provided with an installation groove, the circumferential side wall of the installation groove is provided with a first limiting portion, a second limiting portion and a limiting slide groove, the limiting slide groove connects the first limiting portion and the second limiting portion, and the outer periphery of the rotating member is provided with a plunger, the plunger can slide in the limiting slide groove so that the plunger can be snapped into the first limiting portion or the second limiting portion.

[0023] By adopting this technical solution, precise positioning and switching of the rotatable screen angle in a multimedia mechanism is achieved. Specifically, the limited slide design within the mounting slot allows the plunger to slide smoothly within the slide and accurately engage with the first or second limiter, effectively limiting and fixing the rotation angle of the rotating member. This structure not only improves operational convenience but also enhances the stability of the device, ensuring optimal positioning of the rotatable screen in different application scenarios.

[0024] Optionally, a sliding groove is provided on the circumferential side wall of the mounting groove, and a protrusion is provided on the outer periphery of the rotating member, and the protrusion is slidably engaged with the sliding groove.

[0025] By adopting the above technical solution, the rotating member can rotate in the installation groove, and the cooperation between the protrusion and the sliding groove further improves the limiting effect of the rotatable screen during rotation, thereby improving the reliability of the structure.

[0026] Optionally, it also includes a guiding mechanism, which is provided with two groups. The two groups of guiding mechanisms are respectively provided on both sides of the multimedia mechanism, and the guiding mechanism includes a guiding bracket, a guiding elastic member and a guiding block. The guiding bracket is connected to the receiving box, and the guide block is slidably connected to the guide bracket. One end of the guiding elastic member is connected to the guide bracket, and the other end of the guiding elastic member is connected to the guide block, so that the guide block can be horizontally extended and retracted. A limiting groove is provided at the end of the guide block away from the guide bracket, and the side of the multimedia mechanism can slide with the limiting groove.

[0027] By employing the above-mentioned technical solution, the guide mechanism effectively improves the stability of the multimedia mechanism during lifting. Specifically, two sets of guide mechanisms are located on either side of the multimedia mechanism to ensure balanced force distribution. The guide bracket is connected to the storage box, providing a stable foundation for the entire guide mechanism. The guide block is horizontally retracted via a guide elastic member, allowing the sides of the multimedia mechanism to slide within the retaining grooves, thus preventing the multimedia mechanism from shaking or shifting during lifting.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The lifting mechanism and the limit mechanism work together to effectively limit unexpected movement of the multimedia mechanism through the selective engagement of the upper and lower limit components, thereby improving the stability and safety of the multimedia mechanism during the lifting process;

[0030] 2. Manual operation is simple and convenient. The limit can be released by pressing a button, realizing rapid lifting and lowering adjustment of the multimedia mechanism. At the same time, the limit state is automatically restored after releasing the button, which significantly improves reliability and user operating experience.

[0031] 3. The structural design is compact and reasonable, and the various components in the container work together, which not only meets the flexible adjustment requirements of the equipment height and angle, but also avoids the safety hazards caused by the complex external structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a manually rotatable screen lifter according to an embodiment of the present application.

[0033] Figure 2 It is a front schematic diagram of the interior of the manual rotatable screen lifter according to an embodiment of the present application.

[0034] Figure 3 This is a schematic diagram of the back of the interior of the manual rotatable screen lifter according to an embodiment of the present application.

[0035] Figure 4 It is a schematic diagram of the second support member of an embodiment of the present application.

[0036] Figure 5 It is a schematic diagram of the assembly of the first support member and the second support member of an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1. Storage box;

[0039] 2. Multimedia mechanism; 21. First support member; 22. Second support member; 221. Mounting slot; 2211. First limiting portion; 2212. Second limiting portion; 2213. Limiting slide; 2214. Sliding slot; 23. Rotating member; 231. Plunger; 232. Protrusion; 24. Disc damper; 25. Bottom plate; 26. Rotatable screen;

[0040] 3. Lifting mechanism; 31. Guide frame; 32. Vertical sliding member; 321. Upper protruding member; 322. Lower protruding member; 33. Upper elastic member; 34. Lower elastic member;

[0041] 41. Upper limit assembly; 411. Upper transverse fixing member; 412. Upper transverse sliding member; 4121. First inclined surface; 413. Upper support member; 414. Upper push member;

[0042] 42. Lower limit assembly; 421. Lower transverse fixing member; 422. Lower transverse sliding member; 4221. Second inclined surface; 423. Lower transverse elastic member; 424. Lower pushing member; 425. Lower supporting member;

[0043] 43. Linkage assembly; 431. Linkage member; 4311. Push slot; 432. Longitudinal fixing member; 433. Longitudinal elastic member; 434. Button;

[0044] 5. Buffer mechanism; 51. Damper; 52. Bearing; 53. Gear; 54. Rack;

[0045] 6. Guide mechanism; 61. Guide bracket; 62. Guide elastic member; 63. Guide block; 631. Abutment slope;

[0046] 7. Writing pen mechanism; 71. Pen holder; 72. Movable sleeve; 73. Spring press;

[0047] 8. Microphone. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1 -Attached Figure 5 The present application is further described in detail. In this embodiment, unless otherwise specified, the terms "connected", "connected" and "fixed" are understood in a broad sense, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection and interaction between two elements, and can be understood based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Moreover, in the description of this embodiment, the terms "above", "below", "left", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, orientation words such as "inside" and "outside" used in this application refer to the outlines of the corresponding components themselves.

[0050] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present application discloses a manually rotatable screen lifter (hereinafter referred to as "lifter"), which includes a receiving box 1, a multimedia mechanism 2, a lifting mechanism 3 and a limiting mechanism.

[0051] The storage box 1 is hollow, and the multimedia mechanism 2 includes a rotatable screen 26. The storage box 1 serves as the basic carrier of the entire structure, and the internally integrated lifting mechanism 3 allows the rotatable screen 26 of the multimedia mechanism 2 to be flexibly raised or lowered, thereby adapting to the usage requirements in different scenarios. The lifting mechanism 3 is arranged in the storage box 1, and the lifting mechanism 3 is connected to the multimedia mechanism 2, and the lifting mechanism 3 is used to drive the multimedia mechanism 2 to rise and fall. A bar-shaped through hole is provided on the top of the storage box 1, so that the multimedia mechanism 2 can enter the storage box 1 through the bar-shaped through hole or move out to the top of the storage box 1. A flip cover is rotatably connected to one side of the bar-shaped through hole, which is used to close the bar-shaped through hole when the multimedia mechanism 2 is moved into the storage box 1, thereby reducing the impact of dust on the multimedia mechanism 2 when it is idle.

[0052] like Figure 1 、 Figure 2 and Figure 3 As shown, the limiting mechanism includes an upper limiting assembly 41 and a lower limiting assembly 42. Both the upper limiting assembly 41 and the lower limiting assembly 42 are disposed within the container 1, with the upper limiting assembly 41 disposed above the lower limiting assembly 42. Both the upper limiting assembly 41 and the lower limiting assembly 42 are selectively engageable with the lifting mechanism 3. The upper limiting assembly 41 is used to limit the downward movement of the multimedia mechanism 2 after it is raised; the lower limiting assembly 42 is used to limit the upward movement of the multimedia mechanism 2 after it is lowered.

[0053] The lifter can adjust the height of the multimedia mechanism 2 and ensure that the multimedia mechanism 2 is stably fixed at the required height. At the same time, the upper limit component 41 and the lower limit component 42 in the limit mechanism respectively prevent the multimedia mechanism 2 from moving accidentally during the lifting process by bidirectionally locking it, thereby ensuring safety and stability in use. This design effectively solves the problem that traditional fixed installation methods cannot meet diverse height requirements and improves the user experience. When the height needs to be adjusted, the clamping state between the upper limit component 41 and the lower limit component 42 and the lifting mechanism 3 is released. At this time, the multimedia mechanism 2 can be moved up and down with the lifting mechanism 3 through manual operation. The lifting mechanism 3 and the limit mechanism are both manually adjusted. The manual operation method is used to adjust the mechanical structure, which is more reliable, can reduce the failure rate, and reduce costs.

[0054] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the lifting mechanism 3 includes a guide frame 31, a vertical slide 32, an upper elastic member 33, and a lower elastic member 34. The upper and lower ends of the guide frame 31 are connected to the side walls of the storage box 1, the vertical slide 32 is slidably connected to the guide frame 31, and the multimedia mechanism 2 is connected to the vertical slide 32. The upper end of the upper elastic member 33 is connected to the upper end of the guide frame 31, and the lower end of the upper elastic member 33 can abut the upper end of the vertical slide 32. The lower end of the lower elastic member 34 is connected to the lower end of the guide frame 31, and the upper end of the lower elastic member 34 can abut the lower end of the vertical slide 32. In this embodiment, the guide frame 31 is a frame structure, which includes two transverse rods and two longitudinal guide rods, supported by the upper and lower rods, and two parallel and spaced guide rods are provided between the two rods. Both guide rods are slidably connected to the vertical slide 32 to improve the sliding reliability of the vertical slide 32.

[0055] The guide frame 31 provides a stable sliding path for the vertical slide 32, ensuring that the multimedia mechanism 2 does not deviate during the lifting process. The upper and lower elastic members 33 and 34 work together to support the vertical and horizontal movement of the multimedia mechanism 2 and maintain its position when it stops, preventing positional shifts caused by external vibrations or other factors. This ensures stable vertical lifting of the multimedia mechanism 2. To adjust the height of the multimedia mechanism 2, the operator can apply external force to release the upper elastic member 33 to allow the multimedia mechanism 2 to move downward, or release the lower elastic member 34 to allow the multimedia mechanism 2 to move upward. When lifting the multimedia mechanism 2 upward, the vertical slide 32 compresses the upper elastic member 33; when lowering the multimedia mechanism 2 downward, the lower elastic member 34 is compressed. The resulting restoring force slows the descent, preventing damage or shock caused by a sudden, rapid drop due to gravity. This design not only ensures smooth lifting of the multimedia mechanism 2 but also effectively enhances its ease of use and safety.

[0056] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the lifter further includes a buffer mechanism 5, which includes a damper 51, a bearing 52, a gear 53 and a rack 54. The damper 51 is connected to the vertical sliding member 32, the bearing 52 is sleeved on the damper 51, and the gear 53 is sleeved on the bearing 52, so that the gear 53 and the damper 51 rotate synchronously. The rack 54 is connected to the accommodating box 1, the rack 54 extends vertically, the gear 53 is engaged with the rack 54, and the damper 51 damps the vertical sliding member 32 when it moves downward relative to the rack 54. The damper 51 can select a suitable existing structure as needed, and it is necessary to achieve a one-way damping effect, such as a one-way buffering rotary damper to reduce the resistance effect when the multimedia mechanism 2 moves upward.

[0057] The meshing structure of the gear 53 and the rack 54 ensures the accuracy and reliability of the movement of the vertical slide 32. At the same time, the damper 51 is connected to the gear 53, which can provide stable resistance during the descent of the multimedia mechanism 2, avoiding the risk of unstable operation or damage caused by excessive descent speed, and effectively buffering the descent of the multimedia mechanism 2. When the vertical slide 32 moves downward relative to the rack 54 in the storage box 1, the gear 53 and the rack 54 remain in a meshing state. Since the damper 51 is connected to the vertical slide 32, it will exert resistance on it, making the descent of the multimedia mechanism 2 smoother and more controllable. This design not only effectively avoids the safety hazards caused by the rapid descent of the multimedia mechanism 2 due to improper operation, but also improves the user experience.

[0058] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the limiting mechanism includes a linkage assembly 43, and the linkage assembly 43 can drive the upper limiting assembly 41 and the lower limiting assembly 42 to move to engage or release the lifting mechanism 3.

[0059] The upper limit assembly 41 includes an upper transverse fixing member 411, an upper transverse sliding member 412, an upper transverse elastic member, and an upper pusher 414. The upper transverse fixing member 411 is connected to the side wall of the storage box 1, and the upper transverse sliding member 412 is slidably connected to the upper transverse fixing member 411, allowing the upper transverse sliding member 412 to slide laterally. The upper pusher 414 is disposed at the first end of the upper transverse sliding member 412 and is located on one side of the guide frame 31. The upper pusher 414 cooperates with the linkage assembly 43, so that the vertical movement of the linkage assembly 43 drives the upper pusher 414 away from the longitudinal centerline of the storage box 1, thereby releasing the engagement with the lifting mechanism 3. One end of the upper transverse elastic member is connected to the upper transverse fixing member 411, and the other end is connected to the upper transverse sliding member 412. The upper transverse elastic member is used to drive the upper transverse sliding member 412 to move in the opposite direction and reset. In this embodiment, an upper support member 413 is also provided, which slidably cooperates with the upper transverse sliding member 412 to enhance sliding stability.

[0060] like Figure 1 、 Figure 2 and Figure 3 As shown, the lower limit assembly 42 has a similar structure to the upper limit assembly 41 and includes a lower transverse fixing member 421, a lower transverse sliding member 422, a lower transverse elastic member 423, and a lower pusher 424. The lower transverse fixing member 421 is connected to the side wall of the storage box 1, and the lower transverse sliding member 422 is slidably connected to the lower transverse fixing member 421, allowing the lower transverse sliding member 422 to slide laterally. The lower pusher 424 is disposed at a first end of the lower transverse sliding member 422 and is located on one side of the guide frame 31. The lower pusher 424 cooperates with the linkage assembly 43, so that the vertical movement of the linkage assembly 43 drives the lower pusher 424 away from the longitudinal centerline of the storage box 1, thereby releasing the engagement with the lifting mechanism 3. One end of the lower transverse elastic member 423 is connected to the lower transverse fixing member 421, and the other end is connected to the lower transverse sliding member 422. The lower transverse elastic member 423 is used to drive the lower transverse sliding member 422 to move in the opposite direction and reset. In this embodiment, a lower support member 425 is further provided, which is slidably matched with the lower transverse sliding member 422 to improve the sliding stability.

[0061] The design of the upper transverse sliding member 412 and the upper transverse elastic member ensures that the upper limit assembly 41 can stably clamp the lifting mechanism 3, thereby preventing the multimedia mechanism 2 from accidentally moving downward; at the same time, through the action of the linkage assembly 43, this clamping state can be easily released, so that the multimedia mechanism 2 can freely adjust its height when needed; the functions of the lower transverse sliding member 422 and the lower transverse elastic member 423 are similar to those described above. They ensure the effective operation of the lower limit assembly 42, that is, after the multimedia mechanism 2 descends to the specified position, it effectively prevents it from rebounding upward. The restriction can also be released by a simple operation using the linkage assembly 43. The existence of the linkage assembly 43 greatly simplifies the operator's operating process. Only one action is required to affect the status of the upper limit assembly 41 and the lower limit assembly 42, thereby improving the convenience and efficiency of equipment use.

[0062] like Figure 1 、 Figure 2 and Figure 3 As shown, when the height of the multimedia mechanism 2 needs to be adjusted, the linkage assembly 43 is first operated to move vertically. This causes the linkage assembly 43 to move both the upper pusher 414 and the lower pusher 424 away from the longitudinal centerline of the container 1, thereby releasing the engagement between the upper limit assembly 41 and the lifting mechanism 3, and between the lower limit assembly 42 and the lifting mechanism 3. Subsequently, the lifting mechanism 3 can smoothly raise and lower the multimedia mechanism 2 under the guidance of the guide frame 31. When the linkage assembly 43 is released, the upper and lower transverse slides 412 and 422 move in opposite directions and reset under the restoring forces of the upper and lower transverse elastic members 423. After the multimedia mechanism 2 is raised, the upper limit assembly 41 can reengage with the lifting mechanism 3 to restrict the downward movement of the multimedia mechanism 2. After the multimedia mechanism 2 is lowered, the lower limit assembly 42 can reengage with the lifting mechanism 3 to restrict the upward movement of the multimedia mechanism 2, ultimately effectively locking the height of the multimedia mechanism 2. This design not only enables users to quickly and accurately adjust the position of multimedia devices, but also ensures the stability and safety of the devices at different heights.

[0063] like Figure 1 、 Figure 2 and Figure 3As shown, the linkage assembly 43 optionally includes a linkage member 431, a longitudinal fixing member 432, and a longitudinal elastic member 433. The first end of the linkage member 431 extends through and out of the top of the container 1, while the second end of the linkage member 431 extends vertically into the container 1. The vertical length of the linkage member 431 is greater than the vertical distance between the upper limit assembly 41 and the lower limit assembly 42. The longitudinal fixing member 432 is connected to the container 1, and the linkage member 431 is slidably connected to the longitudinal fixing member 432. One end of the longitudinal elastic member 433 is connected to the longitudinal fixing member 432, and the other end of the longitudinal elastic member 433 is connected to the linkage member 431, allowing the linkage member 431 to return to its original position and move upward after the pressure on the first end is released. The linkage member 431 is provided with a push slot 4311. The upper and lower push members 414, 424 are both provided with push slopes. The upper end surfaces of the push slot 4311 abut the push slopes, so that the vertical downward movement of the linkage member 431 drives the upper and lower push members 414, 424 to move laterally. The linkage assembly 43 may further be provided with a supporting structure, the supporting structure being connected to the containing box 1 and enabling the supporting structure to be slidably connected to the linkage member 431 , thereby improving the stability of the vertical movement of the linkage member 431 .

[0064] The lifter can achieve precise limiting and quick release of the multimedia mechanism 2, optimize the force transmission efficiency during the limiting and unlocking process, and reduce unnecessary energy loss. Specifically, the design of the linkage member 431 allows the user to drive the upper push member 414 and the lower push member 424 to move laterally through a simple vertical downward pressure action, thereby releasing the engagement state between the upper limit assembly 41 and the lower limit assembly 42 and the lifting mechanism 3, making it easier to manually adjust the height of the multimedia mechanism 2. At the same time, the presence of the longitudinal elastic member 433 ensures the automatic reset function after the pressure is released, thereby improving the convenience of operation. This design not only simplifies the user's operating process, but also improves the stability and reliability of the device. It is understandable that the engagement between the lifting mechanism 3 and the limiting mechanism requires manual application of force, applying an upward force when the engagement is increased and a downward force when the engagement is decreased.

[0065] like Figure 1 、 Figure 2 and Figure 3As shown, the linkage member 431 has two push slots 4311, corresponding to the upper push member 414 and the lower push member 424, respectively. To adjust the height of the multimedia mechanism 2, the operator can press the first end of the linkage member 431, causing it to move downward, overcoming the force of the longitudinal elastic member 433. During this process, the two push slots 4311 on the linkage member 431 contact the push ramps on the upper push member 414 and the lower push member 424, respectively, and drive the upper push member 414 and the lower push member 424 to move laterally away from the longitudinal centerline of the storage box 1, thereby releasing the engagement between the upper limit assembly 41 or the lower limit assembly 42 and the lifting mechanism 3. At this point, the lifting mechanism 3 can freely rise and fall within the storage box 1, thereby driving the multimedia mechanism 2 to complete height adjustment. When it is necessary to raise the multimedia mechanism 2, the lower elastic member 34 acts to protrude above the top of the storage box 1, facilitating manual removal. Once the first end of the linkage member 431 is released, the restoring force of the longitudinal elastic member 433 automatically resets the linkage member 431 upward, and the upper and lower push members 414 and 424 return to their original positions, enabling reengagement. Applying a vertical force to the multimedia mechanism 2 allows for reengagement, ensuring the stability of the multimedia mechanism 2 and preventing unintended movement. This design not only facilitates operation but also effectively ensures that the multimedia mechanism 2 remains stable and immobile when not in an adjusted state, improving ease of use and reliability.

[0066] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the linkage assembly 43 includes a button 434, which is provided at the first end of the linkage member 431. The button 434 is used to press the linkage member 431 downward, causing the linkage member 431 to move vertically downward. The provision of the button 434 enables the user to conveniently control the vertical downward movement of the linkage member 431 by pressing the button 434. When the button 434 is pressed, the linkage member 431 moves downward, thereby driving the upper limit assembly 41 and the lower limit assembly 42 to release the engagement with the lifting mechanism 3, thereby achieving height adjustment of the multimedia mechanism 2. This manual triggering method does not require reliance on an external power supply, has a simple and reliable structure, and is low in cost, while ensuring stable operation of the device in various environments.

[0067] like Figure 1 、 Figure 2 and Figure 3As shown, the vertical sliding member 32 optionally includes an upper protrusion 321 and a lower protrusion 322, with the upper protrusion 321 being located above the lower protrusion 322. A first inclined surface 4121 is provided at the second end of the upper transverse sliding member 412. The first inclined surface 4121 causes the upper end of the upper transverse sliding member 412 to be longer than the lower end. The first inclined surface 4121 can slidably cooperate with the upper protrusion 321 to push the upper transverse sliding member 412 to move horizontally. Upon application of a sufficiently large force, the upper protrusion 321 can move below the upper transverse sliding member 412 and engage with the first inclined surface 4121. A second inclined surface 4221 is provided at the second end of the lower transverse sliding member 422. The second inclined surface 4221 causes the upper end of the lower transverse sliding member 422 to be shorter than the lower end. The second inclined surface 4221 can slide with the lower protruding piece 322 to push the lower horizontal sliding piece 422 to move horizontally. After applying a sufficiently large force, the lower protruding piece 322 can move above the lower horizontal sliding piece 422 and engage with the first inclined surface 4121.

[0068] The upper protrusion 321 and the lower protrusion 322 on the vertical slide 32 respectively cooperate with the first inclined surface 4121 of the upper transverse slide 412 and the second inclined surface 4221 of the lower transverse slide 422, enabling the multimedia mechanism 2 to automatically lock during the raising and lowering process. Specifically, when the multimedia mechanism 2 is raised, the upper protrusion 321 can push the first inclined surface 4121 to move below the upper transverse slide 412 and engage with the first inclined surface 4121 of the upper transverse slide 412, forming an upper limit lock to prevent it from sliding down. When the multimedia mechanism 2 is lowered, the lower protrusion 322 can push the second inclined surface 4221 to move above the lower transverse slide 422 and engage with the second inclined surface 4221 of the lower transverse slide 422, forming a lower limit lock to prevent it from moving up.

[0069] like Figure 1 、 Figure 2 and Figure 3 As shown, when the vertical slide 32 drives the multimedia mechanism 2 to rise or fall, the upper protrusion 321 and the lower protrusion 322 move accordingly. During the ascending process, the upper protrusion 321 contacts and slides relative to the first inclined surface 4121 of the upper transverse slide 412 until the two engage, thereby preventing the multimedia mechanism 2 from sliding downward. Simultaneously, the lower protrusion 322 separates from the lower transverse slide 422, ensuring that normal lifting and lowering operations are not affected. During the descending process, the lower protrusion 322 contacts and slides with the second inclined surface 4221 of the lower transverse slide 422, ultimately achieving an engagement and preventing the multimedia mechanism 2 from moving upward. At this point, the upper protrusion 321 disengages from the upper transverse slide 412.

[0070] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the lifter also includes a guide mechanism 6, which can effectively improve the stability of the multimedia mechanism 2 during the lifting process. The guide mechanism 6 is provided with two groups, and the two groups of guide mechanisms 6 are respectively provided on both sides of the multimedia mechanism 2 to ensure balanced force. The guide mechanism 6 includes a guide bracket 61, a guide elastic member 62 and a guide block 63. The guide bracket 61 is connected to the storage box 1, providing a stable foundation for the entire guide mechanism 6, and the guide block 63 is slidably connected to the guide bracket 61. One end of the guide elastic member 62 is connected to the guide bracket 61, and the other end of the guide elastic member 62 is connected to the guide block 63, so that the guide block 63 can be horizontally extended and retracted. A limiting groove is provided at the end of the guide block 63 away from the guide bracket 61, and the side of the multimedia mechanism 2 can slide with the limiting groove, thereby reducing the phenomenon of shaking or offset of the multimedia mechanism 2 during the lifting process.

[0071] As the multimedia mechanism 2 moves up and down with the lifting mechanism 3, the guide blocks 63 on either side of the mechanism 2 slide against the sides, guiding and limiting its motion and preventing deviation or shaking. Furthermore, thanks to the guide elastic members 62, the guide blocks 63 can expand and contract horizontally. Even if the multimedia mechanism 2 is disturbed, the restoring force of the guide elastic members 62 automatically adjusts the position, ensuring a constant close fit against the sides of the multimedia mechanism 2. This design not only improves the reliability of the device but also enhances the durability of the overall structure and the user experience.

[0072] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the guide block 63 is provided with abutment slopes 631 on both the upper and lower sides of the end away from the guide bracket 61. The bottom plate 25 can abut and push the abutment slopes 631, thereby pushing the guide block 63 to move horizontally through the bottom plate 25. This design ensures that the guide block 63 can avoid the multimedia mechanism 2 during the lifting process, reducing movement resistance and improving the stability and reliability of the lifter operation.

[0073] As the multimedia mechanism 2 is raised or lowered, the base plate 25 gradually approaches the guide block 63. Because the guide block 63 is provided with abutment slopes 631 on the upper and lower sides of the end facing away from the guide bracket 61 and protrudes horizontally from the guide bracket 61, the base plate 25 can smoothly contact the abutment slopes 631 and use its own movement to push the guide block 63. During this process, the guide block 63 slides within the guide bracket 61, compressing the guide elastic member 62. This design not only ensures smooth lifting and lowering of the multimedia mechanism 2, but also effectively prevents equipment damage caused by direct collisions, thereby improving the stability and service life of the entire lifter.

[0074] like Figure 2 、 Figure 4 and Figure 5 As shown, optionally, the multimedia mechanism 2 includes a first support member 21, a second support member 22, a rotating member 23, a disc damper 24 and a base plate 25. The base plate 25 is connected to the vertical sliding member 32, the lower end of the first support member 21 is rotatably connected to the base plate 25, and the second support member 22 is rotatably connected to the upper end of the first support member 21. The disc damper 24 is fixedly connected to the rotating member 23, so that the disc damper 24 is rotatably connected to the second support member 22 through the rotating member 23, and the rotatable screen 26 is connected to the disc damper 24. The rotation between the first support member 21 and the base plate 25 and the rotation between the first support member 21 and the second support member 22 both have a damping effect, so that the multimedia mechanism 2 can achieve multi-angle adjustment and maintain stability. The damping effect can be achieved by selecting a damping shaft as needed, or by setting a suitable type of damping structure. In view of the existing related structures, they will not be described here. The rotational connections between the first support member 21 and the base plate 25, as well as the rotational connections between the first support member 21 and the second support member 22, both provide damping, allowing the user to easily adjust the angle of the rotatable screen 26 and maintain the current position after releasing the grip. Furthermore, the connection between the disc damper 24 and the second support member 22 further enhances the stability of the rotatable screen 26 during rotation, preventing position changes caused by minor external disturbances. This design fully meets the user's need for angle adjustment of multimedia devices in different scenarios, enhancing convenience and user experience.

[0075] The coordination of the second support member 22, the rotating member 23, and the disc damper 24 enables the rotatable screen 26 to rotate vertically, allowing it to rotate to a portrait position for easy storage in the storage box 1, or to a landscape position for easy viewing from the side of the storage box 1. The coordination of the base plate 25, the first support member 21, the second support member 22, and the rotating member 23 allows the rotatable screen 26 to be adjusted in position, allowing it to be moved closer to or further away from the operator on the side of the storage box 1, facilitating operator operation. To adjust the angle of the rotatable screen 26, the user simply applies an external force against the damping force. Once released, the damping force ensures that the rotatable screen 26 remains in its set position, preventing it from shifting due to accidental touch. This structure not only enhances user flexibility but also strengthens the stability of the device, fully meeting user needs in a variety of scenarios.

[0076] like Figure 2 、 Figure 4 and Figure 5As shown, optionally, the second support member 22 is provided with a mounting groove 221, and the circumferential side wall of the mounting groove 221 is provided with a first limiting portion 2211, a second limiting portion 2212 and a limiting slide 2213, which are used to achieve precise positioning and switching of the angle of the rotatable screen 26. The limiting slide 2213 connects the first limiting portion 2211 and the second limiting portion 2212. The outer periphery of the rotating member 23 is provided with a plunger 231, which can slide in the limiting slide 2213 so that the plunger 231 can be snapped into the first limiting portion 2211 or the second limiting portion 2212. The limiting slide 2213 in the mounting groove 221 allows the plunger 231 to slide smoothly in the slide and accurately snap into the first limiting portion 2211 or the second limiting portion 2212, thereby effectively limiting and fixing the rotation angle of the rotating member 23. This structure not only improves the convenience of operation, but also enhances the stability of device use, ensuring the optimal posture adjustment of the rotatable screen 26 in different application scenarios.

[0077] When the angle of the rotatable screen 26 needs to be adjusted, external force is applied to cause the plunger 231 to slide along the limiting groove 2213. After overcoming the resistance, the plunger 231 reaches the position of the first limiting portion 2211 or the second limiting portion 2212. The plunger then automatically engages with the corresponding limiting portion through its own elastic properties to complete the positioning. This design not only allows for flexible adjustment of the angle of the rotatable screen 26, but also ensures stability after adjustment, thus meeting the user's needs in different scenarios.

[0078] like Figure 2 、 Figure 4 and Figure 5 As shown, optionally, the plunger 231 is retractable, and the depth of the first limiting portion 2211 and the depth of the second limiting portion 2212 are both greater than the depth of the limiting groove 2213, so as to reduce the risk of swinging back after rotation and improve stability. The retractable design of the plunger 231 enables the plunger 231 to slide flexibly in the limiting groove 2213 and to achieve stable engagement in the first limiting portion 2211 or the second limiting portion 2212. Since the depths of the first limiting portion 2211 and the second limiting portion 2212 are both greater than the depths of the limiting groove 2213, this structure can effectively prevent the plunger 231 from accidentally detaching from the limiting portion in the non-operating state, thereby ensuring the stability of the rotatable screen 26 after the angle is adjusted. At the same time, this design simplifies the operating process of adjusting the angle of the rotatable screen 26 and improves the user experience.

[0079] The plunger 231 is able to move flexibly within the limiting groove 2213 and automatically extend upon reaching the first limiting portion 2211 or the second limiting portion 2212, thereby achieving stable snap-in positioning. Due to the deeper design of the first limiting portion 2211 and the second limiting portion 2212, the plunger 231 is effectively prevented from accidentally disengaging due to external vibrations and other factors, ensuring that the rotatable screen 26 switches between the portrait and landscape positions more reliably. Furthermore, the retractable nature of the plunger 231 allows it to retract during the sliding process, thereby overcoming the resistance of the limiting groove 2213 and ensuring a smooth and seamless rotation process, thus improving the user experience.

[0080] like Figure 2 、 Figure 4 and Figure 5 As shown, optionally, a sliding groove 2214 is provided on the circumferential sidewall of the mounting groove 221, and a protrusion 232 is provided on the outer periphery of the rotating member 23, which slides in cooperation with the sliding groove 2214. The rotating member 23 can rotate within the mounting groove 221, and the cooperation between the protrusion 232 and the sliding groove 2214 further improves the limiting effect of the rotation of the rotatable screen 26, thereby improving the reliability of the structure.

[0081] During the rotation of rotating member 23, protrusion 232 slides along sliding groove 2214, ensuring that the motion trajectory of rotating member 23 is precisely guided, thereby preventing the rotating member 23 from deflecting or getting stuck. This design not only improves the smooth rotation of rotating member 23 but also enhances the reliability of the overall structure, allowing the rotatable screen 26 to adjust its angle more smoothly and accurately. Furthermore, the restraining effect of sliding groove 2214 on protrusion 232 effectively prevents unintended rotation caused by external vibration or impact, further enhancing the user experience.

[0082] like Figure 2 、 Figure 4 and Figure 5 As shown, optionally, the center of the rotating member 23 is the rotation center, the straight line between the first limit portion 2211 and the rotation center is a first connecting line, and the line between the second limit portion 2212 and the rotation center is a second connecting line, with the first connecting line and the second connecting line being perpendicular. With the rotation center as the center, the sliding slot 2214 spans a quarter of a circle, allowing the rotatable screen 26 to transition between a longitudinal position for storage and a lateral position for viewing, meeting the user's viewing needs in different scenarios while preventing structural damage or display anomalies caused by excessive rotation. It is understood that rotation of the rotatable screen 26 is achieved manually to improve operational reliability and reduce the risk of motor failure.

[0083] When the position of the rotatable screen 26 needs to be adjusted, the rotating member 23 can be rotated about the rotation center. Because the lines formed by the first limiter 2211 and the rotation center are perpendicular to each other, and the sliding slot 2214 is designed to span a quarter arc, the rotating member 23 can be precisely constrained between its two extreme positions during rotation. This structure not only enables the rotatable screen 26 to flexibly switch between portrait and landscape modes, but also ensures the accuracy and stability of each positioning, greatly improving the user experience and the convenience of device use.

[0084] like Figure 1 、 Figure 2 and Figure 3 As shown, optionally, the lifter also includes a writing pen mechanism 7. The writing pen mechanism 7 includes a pen barrel 71, a movable sleeve 72 and a spring 73. The pen barrel 71 is connected to the outside of the storage box 1, and the movable sleeve 72 is arranged below the pen barrel 71. The movable sleeve 72 is slidably connected to the storage box 1, so that the writing pen can pass through the pen barrel 71 and abut against the movable sleeve 72. The lower end of the movable sleeve 72 is connected to the spring 73. Pressing the writing pen downward can push the movable sleeve 72 to move vertically, so that the movable sleeve 72 presses the spring 73, thereby popping out the writing pen for use, realizing stable storage and convenient access to the writing pen. This structure not only improves the functional integration of the lifter, but also optimizes the user experience, ensuring that the writing pen can be quickly obtained when it is needed, while avoiding the risk of losing the writing pen. In addition, the restoring force provided by the spring 73 allows the writing pen to be easily taken out, and the operation is simple and reliable. The spring press 73 is also called a rebounder or a cabinet door rebounder. In view of the existing related technologies for the spring press 73, its specific structure and implementation principle will not be described here in detail. You can choose a suitable type of spring press 73 according to your needs.

[0085] like Figure 1 、 Figure 2 and Figure 3 As shown, the lifter optionally also includes a microphone 8, which is located on one side of the storage box 1. The addition of a microphone function to the manually rotatable screen lifter allows users to simultaneously capture and amplify sound when using multimedia devices for presentations or explanations, enhancing the device's integration and practicality. This design eliminates the need for a separate microphone device, simplifies the operation process, and adapts to the needs of various application scenarios. Furthermore, integrating the microphone 8 into the side of the storage box 1 helps maintain the overall compactness and aesthetics of the structure.

[0086] It is understood that the upper elastic member 33, lower elastic member 34, upper transverse elastic member, lower transverse elastic member 423, longitudinal elastic member 433, and guide elastic member 62 in this embodiment may all be springs. The lifter also includes necessary structures for connection, support, driving, positioning, limiting, and power supply functions to ensure the normal operation of the lifter. The shape, size, material, and number of each component of the lifter can be determined as needed to achieve the corresponding function.

[0087] The implementation principle of a manually rotatable screen lifter in the embodiment of the present application is as follows: the container 1 serves as the basic carrier of the entire structure, and the internally integrated lifting mechanism 3 allows the multimedia mechanism 2 to be flexibly raised or lowered to adapt to the usage requirements in different scenarios. At the same time, the upper limit component 41 and the lower limit component 42 in the limit mechanism bidirectionally lock the multimedia mechanism 2 during the lifting process to prevent it from accidentally moving, thereby ensuring the safety and stability of the device. This design effectively solves the problem that traditional fixed installation methods cannot meet the diverse angle and height requirements. At the same time, the method of manually adjusting the mechanical structure also alleviates the problem of poor reliability of the motor drive, thereby improving the user experience.

[0088] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A manual rotatable screen lifter, characterized in that: include: A containing box (1), wherein the containing box (1) is hollow; A multimedia mechanism (2), the multimedia mechanism (2) comprising a rotatable screen (26); A lifting mechanism (3), the lifting mechanism (3) is arranged in the containing box (1), the lifting mechanism (3) is connected to the multimedia mechanism (2), and the lifting mechanism (3) is used to drive the multimedia mechanism (2) to rise and fall; A limiting mechanism, the limiting mechanism comprises an upper limit assembly (41) and a lower limit assembly (42), the upper limit assembly (41) and the lower limit assembly (42) are both arranged in the accommodating box (1), the upper limit assembly (41) is arranged above the lower limit assembly (42), the upper limit assembly (41) and the lower limit assembly (42) can be selectively engaged with the lifting mechanism (3), the upper limit assembly (41) is used to limit the downward movement of the multimedia mechanism (2) after the multimedia mechanism (2) rises, and the lower limit assembly (42) is used to limit the upward movement of the multimedia mechanism (2) after the multimedia mechanism (2) falls, and the lifting mechanism (3) and the limiting mechanism are both manually adjusted; The limiting mechanism includes a linkage assembly (43), and the linkage assembly (43) can drive the upper limit assembly (41) and the lower limit assembly (42) to move so as to engage or disengage the lifting mechanism (3).

2. The manual rotatable screen lifter according to claim 1, characterized in that: The lifting mechanism (3) includes a guide frame (31), a vertical sliding member (32), an upper elastic member (33) and a lower elastic member (34); the upper and lower ends of the guide frame (31) are connected to the side walls of the storage box (1); the vertical sliding member (32) is slidably connected to the guide frame (31); the multimedia mechanism (2) is connected to the vertical sliding member (32); the upper end of the upper elastic member (33) is connected to the upper end of the guide frame (31); the lower end of the upper elastic member (33) can abut against the upper end of the vertical sliding member (32); the lower end of the lower elastic member (34) is connected to the lower end of the guide frame (31); the upper end of the lower elastic member (34) can abut against the lower end of the vertical sliding member (32).

3. The manual rotatable screen lifter according to claim 2, characterized in that: The upper limit assembly (41) includes an upper transverse fixing member (411), an upper transverse sliding member (412), an upper transverse elastic member and an upper pushing member (414); the upper transverse fixing member (411) is connected to the side wall of the storage box (1); the upper transverse sliding member (412) is slidably connected to the upper transverse fixing member (411) so that the upper transverse sliding member (412) slides transversely; one end of the upper transverse elastic member is connected to the upper transverse fixing member (411), and the other end of the upper transverse elastic member is connected to the upper transverse sliding member (412) The upper push member (414) is provided at the first end of the upper transverse sliding member (412), and the upper push member (414) is located on one side of the guide frame (31). The upper push member (414) can cooperate with the linkage assembly (43), so that the vertical movement of the linkage assembly (43) can drive the upper push member (414) to move in a direction away from the longitudinal center line of the storage box (1) to release the engagement with the lifting mechanism (3). The upper transverse elastic member is used to drive the upper transverse sliding member (412) to move in the reverse direction and reset. The lower limit assembly (42) includes a lower transverse fixing member (421), a lower transverse sliding member (422), a lower transverse elastic member (423) and a lower pushing member (424); the lower transverse fixing member (421) is connected to the side wall of the accommodating box (1); the lower transverse sliding member (422) is slidably connected to the lower transverse fixing member (421) so that the lower transverse sliding member (422) slides transversely; one end of the lower transverse elastic member (423) is connected to the lower transverse fixing member (421); the other end of the lower transverse elastic member (423) is connected to the lower transverse sliding member (422), the lower pushing member (424) is provided at the first end of the lower transverse sliding member (422), and the lower pushing member (424) is located on one side of the guide frame (31), the lower pushing member (424) can cooperate with the linkage assembly (43), so that the vertical movement of the linkage assembly (43) can drive the lower pushing member (424) to move in a direction away from the longitudinal center line of the storage box (1) to release the engagement with the lifting mechanism (3), and the lower transverse elastic member (423) is used to drive the lower transverse sliding member (422) to move in the reverse direction and reset.

4. The manual rotatable screen lifter according to claim 3, characterized in that: The linkage assembly (43) includes a linkage member (431), a longitudinal fixing member (432) and a longitudinal elastic member (433). The first end of the linkage member (431) passes through and extends out of the top of the accommodating box (1). The second end of the linkage member (431) vertically extends into the accommodating box (1). The vertical length of the linkage member (431) is greater than the vertical distance between the upper limit assembly (41) and the lower limit assembly (42). The longitudinal fixing member (432) is connected to the accommodating box (1). The linkage member (431) is slidably connected to the longitudinal fixing member (432). The longitudinal elastic member (433) is connected to the accommodating box (1). One end of the elastic member (433) is connected to the longitudinal fixing member (432), and the other end of the longitudinal elastic member (433) is connected to the linkage member (431), so that the pressure on the first end of the linkage member (431) can be reset and moved upward after the pressure is released. The linkage member (431) is provided with a pushing groove (4311), and the upper pushing member (414) and the lower pushing member (424) are both provided with a pushing inclined surface. The upper end surface of the pushing groove (4311) abuts against the pushing inclined surface, so that the vertical downward movement of the linkage member (431) can drive the upper pushing member (414) and the lower pushing member (424) to move horizontally.

5. The manual rotatable screen lifter according to claim 3, characterized in that: The vertical sliding member (32) is provided with an upper protruding member (321) and a lower protruding member (322). The second end of the upper transverse sliding member (412) is provided with a first inclined surface (4121). The first inclined surface (4121) makes the upper end length of the upper transverse sliding member (412) greater than the lower end length. The first inclined surface (4121) can slide with the upper protruding member (321). The upper protruding member (321) can slide with the upper transverse sliding member (412). 2), the second end of the lower transverse sliding member (422) is provided with a second inclined surface (4221), the second inclined surface (4221) makes the upper end length of the lower transverse sliding member (422) smaller than the lower end length, the second inclined surface (4221) can be slidably matched with the lower protruding member (322), and the lower protruding member (322) can be engaged with the first inclined surface (4121) of the lower transverse sliding member (422).

6. The manual rotatable screen lifter according to claim 2, characterized in that: The invention also includes a buffer mechanism (5), which includes a damper (51), a bearing (52), a gear (53) and a rack (54). The damper (51) is connected to the vertical sliding member (32), the bearing (52) is sleeved on the damper (51), the gear (53) is sleeved on the bearing (52), the rack (54) is connected to the accommodating box (1), the rack (54) extends vertically, the gear (53) is engaged with the rack (54), and the damper (51) damps the vertical sliding member (32) when it moves downward relative to the rack (54).

7. The manual rotatable screen lifter according to claim 2, characterized in that: The multimedia mechanism (2) comprises a first support member (21), a second support member (22), a rotating member (23), a disc damper (24) and a bottom plate (25), wherein the bottom plate (25) is connected to the vertical sliding member (32), the lower end of the first support member (21) is rotatably connected to the bottom plate (25), the second support member (22) is rotatably connected to the upper end of the first support member (21), and the disc damper (24) is fixedly connected to the rotating member (23), so that the disc damper (24) passes through the rotating member (23) is rotatably connected to the second support member (22), and the rotatable screen (26) is connected to the disc damper (24), so that the rotatable screen (26) can switch between the horizontal and vertical states in the vertical plane, and the rotatable screen (26) can move in space by rotating the two ends of the first support member (21), and the rotation between the first support member (21) and the bottom plate (25) and the rotation between the first support member (21) and the second support member (22) both have a damping effect.

8. The manual rotatable screen lifter according to claim 7, characterized in that: The second support member (22) is provided with a mounting groove (221), and the circumferential side wall of the mounting groove (221) is provided with a first limiting portion (2211), a second limiting portion (2212) and a limiting slide groove (2213), and the limiting slide groove (2213) is connected to the first limiting portion (2211) and the second limiting portion (2212). The outer periphery of the rotating member (23) is provided with a plunger (231), and the plunger (231) can slide in the limiting slide groove (2213) so that the plunger (231) can be snapped into the first limiting portion (2211) or the second limiting portion (2212).

9. The manual rotatable screen lifter according to claim 8, characterized in that: A sliding groove (2214) is provided on the circumferential side wall of the installation groove (221), and a protrusion (232) is provided on the outer periphery of the rotating member (23), and the protrusion (232) is slidably matched with the sliding groove (2214).

10. The manual rotatable screen lifter according to claim 1, wherein: The multimedia mechanism (2) further comprises a guide mechanism (6), wherein the guide mechanism (6) is provided with two groups, and the two groups of the guide mechanisms (6) are respectively provided on both sides of the multimedia mechanism (2), and the guide mechanism (6) comprises a guide bracket (61), a guide elastic member (62) and a guide block (63), wherein the guide bracket (61) is connected to the storage box (1), and the guide block (63) is slidably connected to the guide bracket (61), one end of the guide elastic member (62) is connected to the guide bracket (61), and the other end of the guide elastic member (62) is connected to the guide block (63), so that the guide block (63) can be horizontally extended and retracted, and a limiting groove is provided at one end of the guide block (63) away from the guide bracket (61), and the side of the multimedia mechanism (2) can be slidably matched with the limiting groove.

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