Locking mechanism and lifting screen

Abstract

The locking mechanism comprises a rotating piece, a base, a switch and a locking piece, the base serves as a main body support, the rotating piece is arranged in the base and can rotate, the switch is arranged on the base, the locking piece is arranged in a floating mode and abuts against the switch, and a locking part of the locking piece can be selectively locked with the rotating piece; when the switch rotates upwards on the base, the locking piece is lifted up and is unlocked from the rotating piece; when the switch rotates downwards, the locking piece falls down to realize locking of the switch and the locking piece; the lifting screen comprises a main body piece, a cross beam and the locking mechanism, the main body piece is arranged on the cross beam in a lifting mode, rotation of the rotating piece is in linkage with lifting of the main body piece, and locking of the locking mechanism on the rotating piece is locking of the main body piece; according to the mechanism, locking and unlocking can be controlled through simple switch rotation operation, and the use convenience is greatly improved; the unique floating abutting design of the locking piece can effectively prevent downward sliding caused by gravity, and the stability of the equipment is ensured.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a locking mechanism and a lifting screen. Background Technology

[0002] In modern office settings, desktop partitions are commonly used as devices for dividing desktop space, protecting privacy, and providing visual buffers. The practicality and convenience of their height adjustment function are crucial. However, traditional desktop partitions generally have functional defects in height adjustment, making it difficult to meet diverse office needs.

[0003] Most existing desktop partitions are designed with a fixed height, which cannot be dynamically adjusted according to the user's height, work environment, or collaboration needs. Taller users may find their desktop activities disturbed by others' view due to a partition that is too low, resulting in insufficient privacy protection. Shorter users may find their visual oppression due to a partition that is too high, affecting natural communication with colleagues. When temporary collaboration or group discussions are needed, fixed-height partitions cannot be quickly lowered to create an open atmosphere. However, when focusing on work, they cannot be raised to enhance privacy, resulting in a "one-size-fits-all" user experience.

[0004] Some desktop screens that attempt to achieve height adjustment still have various defects, among which the inability to achieve stable self-locking is one of the most critical issues. Traditional height adjustment solutions mostly rely on mechanical structures such as gear racks, lead screws and nuts, which often depend on the self-locking ability of the mechanism itself. In cases where the screen slides down due to gravity or load, it affects the height at which the screen stays, resulting in a poor user experience. Therefore, there is an urgent need for a suitable locking mechanism to structurally lock the screen. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a locking mechanism, comprising a rotating component, a base, a switch, and a locking component. The base serves as the main support, the rotating component is rotatable within the base, the switch is mounted on the base, and the locking component is floating and abuts against the switch. Its locking part can selectively lock with the rotating component. When the switch is rotated upwards on the base, the locking component lifts, unlocking the rotating component; when the switch is rotated downwards, the locking component falls, locking the two components. This mechanism allows for locking and unlocking through a simple switch rotation operation, greatly improving ease of use. The unique floating abutment design of the locking component effectively prevents slippage due to gravity, ensuring equipment stability. Furthermore, the mechanism, with the base as its core, has a compact structure, eliminating the need for complex drive components, thus reducing costs and improving product reliability.

[0006] Furthermore, a lifting screen is provided, including a main body, a crossbeam, and the aforementioned locking mechanism. The main body is lifted and lowered on the crossbeam, and the rotation of the rotating component is linked to the lifting and lowering of the main body. The locking mechanism locks the rotating component, which in turn locks the main body.

[0007] The technical solution of this utility model is implemented as follows:

[0008] A locking mechanism includes a rotating member, a base, a switch, and a locking member. The base is configured as the main support of the locking mechanism. The rotating member is rotatably disposed in the base, the switch is rotatably disposed on the base, and the locking member is floatingly disposed on the base and abuts against the switch. The locking member includes a locking part, which is slidably disposed in the base and selectively locks with the rotating member. When the switch is rotated upward on the base, the locking member is lifted and the locking member is unlocked from the rotating member. When the switch is rotated downward on the base, the locking member falls and locks with the rotating member.

[0009] The locking and unlocking of the screen is controlled by rotating a switch on the base. The operation is simple and intuitive. Compared with the traditional complex locking operation, users can quickly switch between raising and lowering the screen and locking it by simply turning the switch, which greatly improves the ease of use. The locking component is floating and abuts against the switch. When the switch is turned downwards, the locking component falls down, and the locking part locks with the rotating component. This structural design can effectively avoid the problem of sliding and sinking caused by the self-locking ability of traditional mechanisms. It can ensure that the desktop screen can stay stably at any height, which significantly improves the user experience. In addition, the locking mechanism is mainly supported by the base, with a compact and simple structure. It does not require complex hydraulic, pneumatic or large motor components, which reduces production costs, reduces the probability of failure, and improves product reliability.

[0010] Preferably, the end of the rotating component is located in the base and is provided with a locking component, which rotates synchronously with the rotating component. When the locking component is locked, the rotating component is also locked synchronously.

[0011] Preferably, both the locked part and the locking part are provided with engaging teeth, which are arranged circumferentially on the locking part and the locked part. Locking by the engagement of the engaging teeth increases the probability of locking, and the user does not need to raise the main body to a certain height to lock, making the locking operation more convenient.

[0012] Preferably, the switch includes a horizontally arranged handle and rotating parts located on both sides of the handle, the rotating parts being rotatably connected to the base, and the handle being configured for the user to operate the switch to rotate.

[0013] Preferably, the rotating part has a limiting part and an abutting part. A limiting protrusion corresponding to the limiting part is provided on the base. The limiting protrusion is located below the switch. When the limiting part abuts against the limiting protrusion downwards, the locking member locks the rotating part. The abutting part is located above the limiting part and is configured to always abut against the locking member. The relationship between the switch and the locking member is simple; they only need to abut against each other, eliminating the need for installation. This simplifies the structure and production assembly steps, making production more efficient.

[0014] Preferably, the limiting protrusion is inclined in the front-to-back direction.

[0015] Preferably, the locking element also includes a follower portion that protrudes horizontally from the locking element and is located above the switch, and the follower portion is configured to always abut against the switch.

[0016] Preferably, the locking part is provided with several sliding protrusions, which slide in contact with the inner wall of the base. This reduces friction and facilitates the sliding of the locking part.

[0017] A retractable screen includes a main body, a crossbeam, and a locking mechanism. The main body is raised and lowered on the crossbeam, the locking mechanism is mounted on the main body, a rotating component is raised and lowered synchronously with the main body, and a base is fixedly mounted on the main body. The locking mechanism is configured such that when the switch is turned upwards, the main body can move up and down relative to the crossbeam; when the switch is turned downwards, the main body remains relatively stationary with respect to the crossbeam. The locking mechanism can lock the raising and lowering of the main body; the raising and lowering of the main body is linked to the rotating component, and locking the rotating component effectively locks the main body.

[0018] Preferably, a compression spring is provided between the main body and the locking member, and the compression spring is configured to always provide a downward sliding force to the locking member. This ensures that the rotating member is effectively locked without operating the switch.

[0019] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0020] The locking and unlocking of the screen is controlled by rotating a switch on the base. The operation is simple and intuitive. Compared with the traditional complex locking operation, users can quickly switch between raising and lowering the screen and locking it by simply turning the switch, which greatly improves the ease of use. The locking component is floating and abuts against the switch. When the switch is turned downwards, the locking component falls down, and the locking part locks with the rotating component. This structural design can effectively avoid the problem of sliding and sinking caused by the self-locking ability of traditional mechanisms. It can ensure that the desktop screen can stay stably at any height, which significantly improves the user experience. In addition, the locking mechanism is mainly supported by the base, with a compact and simple structure. It does not require complex hydraulic, pneumatic or large motor components, which reduces production costs, reduces the probability of failure, and improves product reliability. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the lifting table when the screen device is in a high position in an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the lifting table when the screen device is in a high position in an embodiment of the present invention. Figure 2 ;

[0023] Figure 3 This is a side view of the lifting table when the screen device is in a high position in an embodiment of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the lifting table when the screen device is in a low position in an embodiment of the present invention. Figure 1 ;

[0025] Figure 5 This is a three-dimensional structural diagram of the lifting table when the screen device is in a low position in an embodiment of the present invention. Figure 2 ;

[0026] Figure 6 This is a three-dimensional structural diagram of the movable screen device in an embodiment of the present invention. Figure 1 ;

[0027] Figure 7 This is a three-dimensional structural diagram of the movable screen device in an embodiment of the present invention. Figure 2 ;

[0028] Figure 8 This is a cross-sectional view of the movable screen device in an embodiment of the present invention;

[0029] Figure 9 This is a three-dimensional structural diagram of the lifting housing in an embodiment of the present invention;

[0030] Figure 10 This is a three-dimensional structural diagram of the lifting mechanism and locking mechanism in the embodiment of the present invention, showing that they are arranged in the lifting housing.

[0031] Figure 11 The explosion of the locking mechanism in the embodiment of this utility model Figure 1 ;

[0032] Figure 12 The explosion of the locking mechanism in the embodiment of this utility model Figure 2 ;

[0033] Figure 13 This is a three-dimensional structural diagram of the assist mechanism in the embodiments of this utility model;

[0034] Figure 14 This is a three-dimensional structural diagram of the flexible connector extending from the crossbeam in an embodiment of the present invention;

[0035] Figure 15 This is a three-dimensional structural diagram of the base in an embodiment of the present invention;

[0036] Figure 16 This is a three-dimensional structural diagram of the locking element and the switch abutting in an embodiment of the present invention.

[0037] The attached figures are labeled as follows: Tabletop 1; Table frame 2; Lifting table leg 3; Main body 4; Screen panel 41; Lifting housing 42; Outer housing 421; Connecting plate 4210; Inner housing 422; Baffle 4220; Lifting groove 423; Window 424; Enclosing component 43; Slide groove 44; Shelf 5; Vertical plate 51; Notch 510; Connecting piece 6; Crossbeam 7; Mounting component 71; Guide component 72; Wheel seat 73; Pulley 74; Clearance hole 75; 76. Slider; 77. Adjustment groove; 8. Rotating component; 9. Fixing component; 10. Bearing; 11. Base; 111. Limiting protrusion; 12. Switch; 121. Handle; 122. Rotating part; 1221. Limiting part; 1222. Abutting part; 13. Locking component; 131. Sliding protrusion; 1311. Follower part; 132. Locked component; 14. Engaging tooth; 15. Assisting elastic component; 16. Flexible connecting component; 17. Hidden section; 171. Exposed section; 172. Detailed Implementation

[0038] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0040] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] The specific embodiments of this utility model are as follows:

[0042] like Figure 1-8As shown, this utility model provides a locking mechanism for a lifting screen device, which is applied to a lifting table. The lifting table includes a tabletop 1, a table frame 2, lifting table legs 3, and a movable screen device. The movable screen device includes a main body 4 and a crossbeam 7. The crossbeam 7 is arranged horizontally in the left-right direction and serves as the main support for the movable screen device. The main body 4 is slidably mounted on the crossbeam 7 and acts as the main body of the screen, i.e., to block the view. The tabletop 1 is located above the table frame 2, and the lifting table legs 3 are located below the table frame 2. Each of the left and right ends of the crossbeam 7 has a forward-extending mounting piece 71, which is fixedly connected to the table frame 2 by screws, thereby realizing the installation of the movable screen device with the tabletop 1 or the lifting table legs 3 fixing tube. The main body 4 is located behind the tabletop 1, and the crossbeam 7 is located behind the main body 4.

[0043] The movable screen device also includes a lifting mechanism, a locking mechanism, and an assist mechanism. The movable screen device is a device in which the main body 4 can be raised and lowered, so a lifting mechanism is needed to realize its raising and lowering. After the main body 4 has completed raising and lowering, a locking mechanism is needed to lock it to maintain the height of the main body 4 at this time. The main body 4 of the movable screen device is manually controlled, so an assist mechanism is also needed to realize labor-saving operation.

[0044] Specifically:

[0045] like Figure 6-10 As shown, the main component 4 includes a screen panel 41 and a lifting housing 42. The lifting housing 42 is vertically arranged in the middle of the screen panel 41 in the left-right direction. The lifting housing 42 is provided with a lifting groove 423 for avoiding the crossbeam 7. The crossbeam 7, the lifting mechanism, and the locking mechanism are all located in the lifting housing 42. The crossbeam 7 is a hollow structure that is open in the front and closed in the back. The lifting mechanism, the locking mechanism, and the assist mechanism are basically located inside the lifting housing 42 and the crossbeam 7. The lifting housing 42 includes an outer shell 421 and an inner shell 422. The inner shell 422 is fixedly connected to the screen panel 41, and the outer shell 421 is fixedly connected to the inner shell 422. The left and right ends of the inner shell 422 extend towards the outer shell 421 with baffles 4220. The upper and lower ends of the outer shell 421 both extend towards the outer shell 421 with connecting plates 4210. The connecting plates 4210 are located outside the baffles 4220.

[0046] The outer edge of the screen panel 41 is provided with a surrounding member 43 that follows its contour, which protects the screen panel 41. Slide grooves 44 are provided on the left and right sides of the surrounding member 43, and a guide member 72 is provided on the crossbeam 7. The guide member 72 is located on the side of the screen panel 41 and is disposed in the slide groove 44, with the guide member 72 slidingly engaging with the slide groove 44. The engagement between the guide member 72 and the slide groove 44 provides lifting and guiding, which is beneficial to the lifting stability of the main body 4. The guide member 72 is specifically disposed on the forward-extending mounting member 71. The surrounding member 43 is harder; generally, the screen panel 41 is made of wood, plastic, or glass, while the surrounding member 43 is made of metal or hard plastic to protect the screen panel 41 and prevent it from being damaged during transportation.

[0047] The lifting mechanism includes a rotating component 8 and a fixed component 9. The rotating component 8 is rotatably mounted on the main body 4 and moves up and down synchronously with the main body 4. The fixed component 9 is fixedly mounted on the crossbeam 7 and located between the baffles 4220. The rotating component 8 and the fixed component 9 are connected by a transmission. When the main body 4 moves up and down, the rotating component 8 rotates under the action of the fixed component 9. The lifting mechanism is a screw and nut assembly, with the rotating component 8 being the screw and the fixed component 9 being the nut. The rotating component 8 is vertically mounted in the lifting housing 42 of the main body 4, and the rotating component 8 and the fixed component 9 are connected by a threaded transmission.

[0048] like Figure 10-12 As shown in Figures 15 and 16, the locking mechanism is mounted on the main body 4 and has a locked state and an unlocked state. In the unlocked state, the main body 4 moves up and down. In the locked state, the movement of the main body 4 is locked by the rotation of the locking rotating member 8. The locking mechanism includes a base 11, a switch 12, a locking member 13, and a locked member 14. The base 11 is fixedly mounted on the inner shell 422 and located between two baffles 4220. A bearing 10 is provided inside the base 11. One end of the rotating member 8 is located in the bearing 10. The locked member 14 is synchronously rotated and mounted on that end of the rotating member 8 and located in the base 11. The locked member 14 is located above the bearing 10 and closer to the locking member 13 relative to the bearing 10. The switch 12 is rotatably mounted on the base 11 about an axis in the left-right direction. Switch 12 is movably positioned relative to the main body 4, and is configured to control the state of the locking mechanism. Locking member 13 is floatingly positioned on the base 11 and abuts against switch 12. Locking member 13 selectively locks with locked member 14. Locking member 13 is locked when it moves downward toward locked member 14, and unlocked when it moves upward away from locked member 14. Switch 12 has a tendency to move downward and keep the locking mechanism in the locked state. This tendency can be caused by the weight of switch 12 and locking member 13. In the locked state, the locking mechanism holds rotating member 8 and keeps the main body 4 and crossbeam 7 relatively stationary. When switch 12 moves upward and lifts up, the locking mechanism is in the unlocked state, and rotating member 8 can rotate so that the main body 4 can slide up and down relative to crossbeam 7.

[0049] Furthermore, the locking member 13 includes a locking part 131 and a follower part 132 that are fixed to each other. The locking part 131 is slidably disposed in the base 11, and the follower part 132 protrudes horizontally from the locking part 131 and is located above the switch 12. The follower part 132 is always in contact with the switch 12 and moves with the rotation of the switch 12. When the switch 12 is rotated downward, the locking member 13 slides downward accordingly, and the locking member 13 falls down and locks the locking part 131 with the locked member 14, and the locking mechanism is in the locked state. When the switch 12 is rotated upward, the locking member 13 slides upward accordingly, and the locking member 13 is lifted up and disengages the locking part 131 from the locked member 14, and the locking mechanism is in the unlocked state. Both the locking part 131 and the locked member 14 are provided with meshing teeth 15, which are arranged circumferentially on the locking part 131 and the locked member 14.

[0050] The switch 12 includes a horizontally arranged handle 121 and rotating parts 122 located on both sides of the handle 121. The rotating parts 122 are rotatably connected to the base 11. The handle 121 is configured for the user to operate the switch 12 to rotate. The rotating part 122 has a limiting part 1221 and an abutting part 1222. The base 11 is provided with a limiting protrusion 111 corresponding to the limiting part 1221. The limiting protrusion 111 is located below the switch 12. When the limiting part 1221 abuts against the limiting protrusion 111 downwards, the locking member 13 locks against the rotating member 8. The abutting part 1222 is located above the limiting part 1221 and is configured to always abut against the locking member 13. The limiting protrusion 111 is inclined in the front-back direction, and the rotating part 122 is also inclined. When locked, the two abut against each other. When unlocked, the handle 121 is horizontal, which makes it easy for the user to move the main body 4 directly up or down. A window 424 is also provided on the lifting housing 42 to expose the switch 12.

[0051] A downward pressure spring (not shown) is provided on the upper end surface of the follower part 132. The downward pressure spring abuts against the inner shell 422. The downward pressure spring is configured to always provide a spring force to the locking member 13 to slide downward, that is, to provide a spring force to the switch 12 to rotate downward.

[0052] The locking part 131 is provided with a plurality of sliding protrusions 1311. The sliding protrusions 1311 slide in cooperation with the inner wall of the base 11, which can reduce friction and facilitate the sliding of the locking part 13.

[0053] like Figure 10 , 13As shown in Figure 14, the assist mechanism is installed on the main body 4 and the crossbeam 7. The assist mechanism is configured to always provide an upward elastic force to the main body 4. An assist mechanism is provided on each side of the lifting housing 42 to maintain the balance of the auxiliary lifting force. The assist mechanism includes an assist elastic element 16 whose elastic force varies with its length and a flexible connector 17 whose length remains constant. One end of the assist elastic element 16 is fixedly connected to the crossbeam 7, and the other end of the assist elastic element 16 is connected to one end of the flexible connector 17. The other end of the flexible connector 17 is connected to the main body 4. The assist elastic element 16 provides an upward elastic force to the main body 4 through the flexible connector 17. When the main body 4 slides downward relative to the crossbeam 7, the elastic force of the assist elastic element 16 increases. When the main body 4 slides upward relative to the crossbeam 7, the elastic force of the assist elastic element 16 decreases. The assist mechanism provides assistance when the main body 4 rises and provides cushioning when the main body 4 falls.

[0054] The flexible connector 17 is disposed at the lower end of the main body 4. The flexible connector 17 includes a hidden section 171 located in the crossbeam 7 and an exposed section 172 exposed in the crossbeam 7. The length of the flexible connector 17 remains unchanged. The assisting elastic member 16 and the hidden section 171 are both arranged in the left-right direction. The sum of the lengths of the hidden section 171 and the assisting elastic member 16 remains unchanged. When the main body 4 slides downward relative to the crossbeam 7, the length of the exposed section 172 increases, the length of the hidden section 171 decreases, and the assisting elastic member 16 becomes longer and its elasticity increases.

[0055] The assisting elastic element 16 is a tension spring, and the flexible connector 17 is a pull rope. The assisting elastic element 16 is installed inside the crossbeam 7. A wheel seat 73 is fixedly installed inside the crossbeam 7. A pulley 74 is rotatably installed on the wheel seat 73. The flexible connector 17 abuts against the pulley 74 and is bent and turned by the pulley 74. The crossbeam 7 is provided with a clearance hole 75. After the flexible connector 17 is bent and turned, it extends out of the crossbeam 7 through the clearance hole 75.

[0056] A slider 76 is provided inside the crossbeam 7. The assisting elastic element 16 is connected to the slider 76. The slider 76 is slidably disposed in the crossbeam 7 in the left and right direction. An adjustment structure is provided between the crossbeam 7 and the slider 76. The position of the slider 76 in the left and right direction is locked by the adjustment structure. The slider 76 is used to adjust the elastic force of the assisting elastic element 16. The adjustment structure includes an adjustment groove 77 and an adjustment bolt. The adjustment groove 77 is arranged on the crossbeam 7 in the left and right direction. The adjustment bolt is locked on the slider 76 through the adjustment groove 77.

[0057] The upper part of the main body 4 is provided with a table for placing items. Specifically, the upper part of the main body 4 is fixedly provided with a shelf 5, and the length of the shelf 5 in the front-to-back direction is greater than the thickness of the main body 4 in the front-to-back direction. The upper part of the main body 4 is provided with an L-shaped connecting piece 6, which is fixedly connected to the main body 4 and the shelf 5 respectively.

[0058] The locking mechanism is located at the upper end of the lifting housing 42 and near the upper edge of the main body 4. A vertical plate 51 is provided behind the shelf 5 to prevent items from falling. A notch 510 is provided on the vertical plate 51 above the lifting housing 42 or the locking mechanism. The distance between the lower end of the notch 510 and the switch 12 is configured to allow the user to cover it with one hand. The switch 12 is exposed from the window 424. During operation, the user only needs to place one hand in both the window 424 and the notch 510 at the same time, and flip the switch 12 upward and pinch the main body 4 to move it up and down to complete the lifting adjustment.

Claims

1. A locking mechanism, characterized in that: The device includes a rotating component, a base, a switch, and a locking component. The base serves as the main support for the locking mechanism. The rotating component is rotatably mounted in the base, the switch is rotatably mounted on the base, and the locking component is floatingly mounted on the base and abuts against the switch. The locking component includes a locking part that is slidably mounted in the base and selectively locks against the rotating component. When the switch is rotated upwards on the base, the locking component is lifted and unlocked from the rotating component. When the switch is rotated downwards on the base, the locking component falls and locks against the rotating component.

2. The locking mechanism according to claim 1, characterized in that: The end of the rotating component is located in the base and is provided with a locking component, which is set to rotate synchronously with the rotating component.

3. The locking mechanism according to claim 2, characterized in that: Both the locked part and the locking part are provided with meshing teeth, which are arranged circumferentially on the locking part and the locked part.

4. The locking mechanism according to claim 1, characterized in that: The switch includes a horizontally arranged handle and rotating parts located on both sides of the handle. The rotating parts are rotatably connected to the base, and the handle is configured for the user to operate the switch.

5. The locking mechanism according to claim 4, characterized in that: The rotating part has a limiting part and an abutting part. The base is provided with a limiting protrusion corresponding to the limiting part. The limiting protrusion is located below the switch. When the limiting part abuts against the limiting protrusion downwards, the locking member locks the rotating part. The abutting part is located above the limiting part and is configured to always abut against the locking member.

6. The locking mechanism according to claim 5, characterized in that: The limiting protrusion is inclined in the front-to-back direction.

7. The locking mechanism according to claim 1, characterized in that: The locking element also includes a follower part that protrudes horizontally from the locking element and is located above the switch. The follower part is configured to always abut against the switch.

8. The locking mechanism according to claim 1, characterized in that: The locking part is provided with several sliding protrusions, which slide in contact with the inner wall of the base.

9. A retractable screen, characterized in that: The device includes a main body, a crossbeam, and a locking mechanism as described in any one of claims 1-8. The main body is raised and lowered on the crossbeam, the locking mechanism is mounted on the main body, the rotating part is raised and lowered synchronously with the main body, and the base is fixedly mounted on the main body. The locking mechanism is configured such that when the switch is turned upward, the main body can move up and down relative to the crossbeam, and when the switch is turned downward, the main body and the crossbeam remain relatively stationary.

10. The locking mechanism according to claim 9, characterized in that: A downward pressure spring is provided between the main body and the locking part, and the downward pressure spring is configured to always provide a spring force to the locking part to slide downward.

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