Adjustable positioning and lifting support for installing displayer

By designing adjustable mounting and adjustment components, combined with universal wheels and balance components, the problem that the existing positioning and lifting bracket cannot be adjusted is solved, and stable fixation and angle adjustment of display screens of different sizes and heights is achieved, improving the Adaptability and stability.

CN222278005UActive Publication Date: 2024-12-31SUZHOU YIKELONG ELECTRONIC INSTR CO LTD
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Patent Information

Application Number
CN202421176949.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-28
Publication Date
2024-12-31
Estimated Expiration
2034-05-28

AI Technical Summary

Technical Problem

The existing positioning and lifting brackets used for mounting monitors are fixed structures and cannot be adjusted according to display screens of different sizes and different usage needs, and are less adaptable.

Method used

An adjustable positioning support bracket including a display screen body, an installation assembly, a first adjustment assembly, a second adjustment assembly, a balance assembly and a universal wheel are designed, and the display screen is realized through the adjustable installation assembly and an adjustment assembly. Fixed and height-adjusted, universal wheels are used for angle adjustment, and balanced components maintain stability.

Benefits of technology

It realizes stable fixation and angle adjustment of display screens of different sizes and heights, enhances adaptability, ensuring the stability and convenient installation of the display screen.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of display brackets, in particular to an adjustable positioning and lifting bracket for mounting a display. The technical problems that an existing positioning and lifting support for installing the displayer is usually of a fixed structure, corresponding adjustment is not convenient to carry out according to display screens of different sizes and different use requirements, and adaptability is low are solved, and compared with a traditional positioning and lifting support for installing the displayer, the existing positioning and lifting support for installing the displayer is not convenient to adjust. Comprising a display screen body, mounting assemblies, a first adjusting assembly, a second adjusting assembly, a balance assembly, a supporting seat and universal wheels, the adjustable mounting assemblies can be used for mounting and fixing display screens of different sizes, and the first adjusting assembly can be used for adjusting the distance between the two mounting assemblies; the height of the display screen body can be adjusted according to different use requirements by arranging the second adjusting assembly, the display screen body can be conveniently moved and the angle of the display screen body can be conveniently adjusted by arranging the universal wheels, and the stability of the display screen body can be kept by arranging the balance assembly.
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Description

Technical Field

[0001] The utility model relates to the field of display brackets, in particular to an adjustable positioning and lifting bracket for installing a display. Background Art

[0002] The monitor is an output device of the computer, used to display the processing process and results of the computer. It can display electronic files on the screen through a specific transmission device. The positioning and lifting bracket for installing the monitor, usually called a monitor bracket or a computer bracket, is a device that can fix products such as monitors, notebooks or tablets. Its main function is to fix and support the monitor, and is used to help solve various technical problems encountered when operating a computer at home or in a commercial office. The existing positioning and lifting bracket for installing the monitor is usually a fixed structure setting, which is not convenient for corresponding adjustment according to different sizes of display screens and different usage requirements, and has low adaptability. Utility Model Content

[0003] In order to overcome the existing positioning and lifting brackets for installing monitors, they are usually set as fixed structures, which are not convenient for corresponding adjustment according to different sizes of display screens and different usage requirements, and have low adaptability.

[0004] The technical solution of the utility model is: an adjustable positioning and lifting bracket for installing a display, comprising a display screen body, a mounting component, a first adjustment component, a second adjustment component, a balancing component, a support seat and universal wheels, the rear end of the display screen body is symmetrically and detachably mounted with two groups of mounting components for mounting and fixing the display screen body, the lower ends of the two groups of mounting components are fixedly connected with first adjustment components for adjusting the spacing between the two groups of mounting components, the lower ends of the first adjustment components are symmetrically and fixedly connected with two groups of second adjustment components for adjusting the height of the display screen body, the lower end of the second adjustment component is fixedly mounted with a support seat for support, the left and right ends of the support seat are fixedly connected with balancing components for maintaining the stability of the support seat, and the lower end of the support seat is symmetrically provided with two groups of universal wheels for moving the display screen body and adjusting its angle.

[0005] Preferably, an adjustable mounting component can be used to install and fix display screens of different sizes, a first adjusting component can be used to adjust the distance between two groups of mounting components, a second adjusting component can be used to adjust the height of the display screen body according to different usage requirements, universal wheels can be used to facilitate both moving the display screen body and adjusting the angle of the display screen body, and a balancing component can be used to maintain the stability of the display screen body.

[0006] Preferably, the mounting assembly includes a clamping block, a first telescopic sleeve, a first adjusting bolt, a limit block, a second adjusting bolt, an anti-slip pad and a protective layer. The clamping blocks are symmetrically arranged in two groups, and the two groups of clamping blocks are connected by adjustment through the first telescopic sleeve. A plurality of first limit holes for adjusting the length of the first telescopic sleeve are evenly distributed from top to bottom on the outside of the first telescopic sleeve. A first adjusting bolt for fixing the first telescopic sleeve is arranged on the outside of the first telescopic sleeve. The first adjusting bolt adjusts the length of the first telescopic sleeve by connecting with different first limit holes.

[0007] Preferably, a limit block is provided on the inner side of the clamp block for cooperating with the clamp block to clamp and fix the display screen body, and a second adjusting bolt is provided at the front end of the clamp block for adjusting the position of the limit block. The second adjusting bolt passes through the outer side of the clamp block and extends to the inner side to control the movement of the limit block. An anti-slip pad is provided on the end of the limit block away from the second adjusting bolt for protecting the display screen body and increasing friction, and a protective layer is provided on the inner side of the clamp block for protecting the display screen body. By providing the anti-slip pad and the protective layer, the display screen body can be protected so that it is not easily damaged by clamping, and the friction can be increased to make the clamping more stable.

[0008] Preferably, the first adjustment component includes a support plate, a bidirectional threaded rod, a slider and a drive motor. The upper end of the support plate is provided with a slide groove for sliding the slider, and a bidirectional threaded rod for rotation is installed inside the slide groove.

[0009] Preferably, two groups of sliding sliders are symmetrically sleeved on the outer side of the bidirectional threaded rod, and an output shaft is provided on the driving motor. The output shaft of the driving motor passes through the outer side of the support plate and extends to the inner side to drive the bidirectional threaded rod to rotate. The driving motor drives the bidirectional threaded rod to rotate so that the bidirectional threaded rod can drive the two groups of sliders to move relative to each other along their surfaces during the rotation process to adjust the distance between the two groups of mounting components.

[0010] Preferably, the second adjustment component includes a second telescopic sleeve and a third adjusting bolt. A plurality of second limiting holes for adjusting the length of the second telescopic sleeve are evenly distributed on the outer side of the second telescopic sleeve from top to bottom. A third adjusting bolt for fixing and adjusting the length of the second telescopic sleeve is provided on the outer side of the second telescopic sleeve. The third adjusting bolt adjusts the length of the second telescopic sleeve by connecting to different second limiting holes. The length of the second telescopic sleeve can be adjusted by fixing the third adjusting bolt in different second limiting holes, so that the height of the display screen body can be adjusted by changing the length of the second telescopic sleeve.

[0011] Preferably, the balancing assembly includes a support block, a fourth adjusting bolt and a suction cup. A suction cup for sucking the ground is provided under the support block. The suction cup is adjustably connected to the support block through the fourth adjusting bolt. The fourth adjusting bolt passes through the upper end of the support block and extends to the lower end to control the up and down movement of the suction cup. The suction cup can be controlled to move up and down by turning the fourth adjusting bolt, so that when the display screen body is working, the stability of the support base can be maintained by adjusting the suction cup to tightly suck the ground.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the traditional positioning and lifting bracket for installing the display, which is usually set as a fixed structure, it is not convenient to adjust according to the display screens of different sizes and different usage requirements, and the adaptability is low. By setting an adjustable mounting component, it can be used to install and fix display screens of different sizes. By setting two sets of mounting components to fix the display screen body symmetrically, the stability can be increased. By setting clamping blocks that are relatively arranged up and down on each set of mounting components, the upper and lower ends of the display screen body can be clamped, and by setting a limit block on the inner side of the clamping block, the front and rear ends of the upper and lower frames of the display screen body can be clamped in cooperation with the clamping block, so that the display screen body is not easy to shake or deviate. By setting a second adjusting bolt to control the movement of the limit block, it can be used to fix display screen bodies of different thicknesses. The two groups of clamping blocks are connected by a first telescopic sleeve column with adjustable length, so that the first telescopic sleeve column can be adjusted to different lengths by connecting and fixing the first adjusting bolt on the first telescopic sleeve column with different first limiting holes, thereby adjusting the spacing between the two groups of clamping blocks by changing the length of the first telescopic sleeve column, so that the clamping blocks can be used to clamp and fix display screen bodies of different heights, and the spacing between the two groups of mounting components can be adjusted by setting the first adjusting component, and the bidirectional threaded rod can be driven to rotate by setting a driving motor, so that the bidirectional threaded rod can drive the two groups of sliders to move relative to each other along their surfaces during the rotation process to adjust the distance between the two groups of mounting components, so that the mounting component can be used to install and fix display screen bodies of different lengths, and the mounting component that can be adjusted to be suitable for display screen bodies of different sizes is more convenient and practical.

[0014] 2. By setting a second adjusting component, the height of the display screen body can be adjusted according to different usage requirements. By setting an adjustable second telescopic sleeve to support the display screen body, the length of the second telescopic sleeve can be adjusted by connecting and fixing the third adjusting bolt on the second telescopic sleeve to different second limiting holes, thereby adjusting the height of the display screen body by changing the length of the second telescopic sleeve. By setting a universal wheel at the lower end of the support base, it is convenient to move the display screen body to a corresponding position and to adjust the angle of the display screen body by pushing the display screen body to adjust the sliding direction of the universal wheel. By setting a balancing component, the stability of the display screen body can be maintained during its operation. By turning the fourth adjusting bolt, the suction cup can be controlled to move up and down, so that when the display screen body is working, the stability of the support base can be maintained by adjusting the suction cup to tightly suck the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is an overall schematic diagram of an adjustable positioning and lifting bracket for mounting a display according to the utility model;

[0016] Figure 2 Shown is another angle schematic diagram of the adjustable positioning and lifting bracket for mounting a display of the utility model;

[0017] Figure 3 Shown is a schematic diagram of the installation components in the adjustable positioning and lifting bracket for installing a display of the utility model;

[0018] Figure 4 Shown is a schematic diagram of a first adjustment component in an adjustable positioning and lifting bracket for mounting a display according to the present invention;

[0019] Figure 5 Shown is a schematic diagram of the second adjustment component in the adjustable positioning and lifting bracket for mounting a display of the present invention.

[0020] Explanation of the accompanying drawings: 1. display screen body; 2. mounting assembly; 3. first adjustment assembly; 4. second adjustment assembly; 5. balancing assembly; 6. support seat; 7. universal wheel; 201. clamping block; 202. first telescopic sleeve; 203. first limiting hole; 204. first adjusting bolt; 205. limiting block; 206. second adjusting bolt; 207. anti-slip pad; 208. protective layer; 301. support plate; 302. slide groove; 303. bidirectional threaded rod; 304. slider; 305. drive motor; 401. second telescopic sleeve; 402. second limiting hole; 403. third adjusting bolt; 501. support block; 502. fourth adjusting bolt; 503. suction cup. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1-2 The utility model provides an embodiment: an adjustable positioning and lifting bracket for installing a display, comprising a display body 1, a mounting assembly 2, a first adjustment assembly 3, a second adjustment assembly 4, a balancing assembly 5, a support seat 6 and a universal wheel 7. The rear end of the display body 1 is symmetrically and detachably mounted with two groups of mounting assemblies 2 for mounting and fixing the display body 1. The lower ends of the two groups of mounting assemblies 2 are fixedly connected with the first adjustment assembly 3 for adjusting the spacing between the two groups of mounting assemblies 2. The lower ends of the first adjustment assembly 3 are symmetrically and fixedly connected with two groups of second adjustment assemblies 4 for adjusting the height of the display body 1. The lower end of the second adjustment assembly 4 is fixedly mounted with a support seat 6 for support. The left and right ends of the support seat 6 are both fixedly connected with a balancing assembly 5 for maintaining the stability of the support seat 6. The lower end of the support seat 6 is symmetrically provided with two groups of universal wheels 7 for moving the display body 1 and adjusting its angle.

[0023] See also Figure 3 In this embodiment, the mounting assembly 2 includes a clamping block 201, a first telescopic sleeve 202, a first adjusting bolt 204, a limiting block 205, a second adjusting bolt 206, an anti-slip pad 207 and a protective layer 208. The clamping block 201 is symmetrically arranged in two groups, and the two groups of clamping blocks 201 are adjusted and connected through the first telescopic sleeve 202. The outer side of the first telescopic sleeve 202 is evenly distributed from top to bottom to open a plurality of groups of first limiting holes 203 for adjusting the length of the first telescopic sleeve 202. The outer side of the first telescopic sleeve 202 is provided with a first adjusting bolt 204 for fixing the first telescopic sleeve 202. The first adjusting bolt 204 is connected with different first limiting holes 203 to adjust the length of the first telescopic sleeve 202. The clamp block 201 is short, and a limit block 205 is provided on the inner side of the clamp block 201 for clamping and fixing the display screen body 1 in cooperation with the clamp block 201. A second adjusting bolt 206 is provided at the front end of the clamp block 201 for adjusting the position of the limit block 205. The second adjusting bolt 206 passes through the outer side of the clamp block 201 and extends to the inner side to control the movement of the limit block 205. An anti-skid pad 207 is provided at one end of the limit block 205 away from the second adjusting bolt 206 for protecting the display screen body 1 and increasing friction. A protective layer 208 is provided on the inner side of the clamp block 201 for protecting the display screen body 1. By arranging the anti-skid pad 207 and the protective layer 208, the display screen body 1 can be protected from being easily damaged by clamping, and the friction can be increased to make the clamping more stable.

[0024] See also Figure 4In this embodiment, the first adjustment component 3 includes a support plate 301, a bidirectional threaded rod 303, a slider 304 and a driving motor 305. The upper end of the support plate 301 is provided with a slide groove 302 for the slider 304 to slide. The inside of the slide groove 302 is provided with a bidirectional threaded rod 303 for rotation. The outer side of the bidirectional threaded rod 303 is symmetrically sleeved with two groups of sliders 304 for sliding. An output shaft is provided on the driving motor 305. The output shaft of the driving motor 305 passes through the outer side of the support plate 301 and extends to the inner side to drive the bidirectional threaded rod 303 to rotate. The driving motor 305 drives the bidirectional threaded rod 303 to rotate so that the bidirectional threaded rod 303 can drive the two groups of sliders 304 to move relative to each other along its surface during the rotation to adjust the distance between the two groups of mounting components 2.

[0025] See also Figure 5 In this embodiment, the second adjustment component 4 includes a second telescopic sleeve 401 and a third adjustment bolt 403. A plurality of second limiting holes 402 for adjusting the length of the second telescopic sleeve 401 are evenly arranged on the outer side of the second telescopic sleeve 401 from top to bottom. A third adjustment bolt 403 for fixing and adjusting the length of the second telescopic sleeve 401 is provided on the outer side of the second telescopic sleeve 401. The third adjustment bolt 403 is connected with different second limiting holes 402 to adjust the length of the second telescopic sleeve 401. The length of the second telescopic sleeve 401 can be adjusted by fixing the third adjustment bolt 403 in different second limiting holes 402, so that the length of the second telescopic sleeve 401 can be adjusted. The height of the display screen body 1 is adjusted by changing the length of the second telescopic sleeve 401. The balancing assembly 5 includes a support block 501, a fourth adjusting bolt 502 and a suction cup 503. A suction cup 503 for sucking the ground is provided under the support block 501. The suction cup 503 is adjustably connected to the support block 501 through the fourth adjusting bolt 502. The fourth adjusting bolt 502 passes through the upper end of the support block 501 and extends to the lower end to control the up and down movement of the suction cup 503. The suction cup 503 can be controlled to move up and down by turning the fourth adjusting bolt 502, so that when the display screen body 1 is working, the stability of the support base 6 can be maintained by adjusting the suction cup 503 to tightly suck the ground.

[0026] When working, firstly, the distance between the two groups of mounting components 2 is adjusted to a suitable size according to the size of the display screen body 1 to be installed, and the bidirectional threaded rod 303 is driven to rotate by the driving motor 305, so that the bidirectional threaded rod 303 drives the two groups of sliders 304 to move relatively along the surface thereof during the rotation process to adjust the distance between the two groups of mounting components 2;

[0027] Then, the display screen body 1 is placed between four groups of clamping blocks 201 that are symmetrical in the upper and lower directions, and the first adjusting bolts 204 are fixed in the first limiting holes 203 at the corresponding positions so that the two groups of clamping blocks 201 that are arranged opposite to each other tightly clamp the upper and lower ends of the display screen body 1;

[0028] Then, by screwing the second adjusting bolt 206, the limiting block 205 cooperates with the clamping block 201 to clamp the front and rear ends of the frame of the display screen body 1;

[0029] Then, the display screen body 1 is adjusted to a suitable height by using the second adjustment component 4, and the length of the second telescopic sleeve 401 is adjusted by connecting and fixing the third adjustment bolt 403 on the second telescopic sleeve 401 with different second limiting holes 402 to change the height of the display screen body 1;

[0030] Then push the display screen body 1 to the corresponding position, and push it to a suitable angle through the universal wheel 7;

[0031] Finally, the support base 6 is supported and fixed by the balancing assembly 5, and the suction cup 503 is controlled to move downward by turning the fourth adjusting bolt 502 until the suction cup 503 is tightly attached to the ground.

[0032] Through the above steps, the staff first adjusts the spacing between the two groups of mounting components 2 to a suitable size according to the size of the display screen body 1 to be installed, and drives the bidirectional threaded rod 303 to rotate by driving the motor 305, so that the bidirectional threaded rod 303 drives the two groups of sliders 304 to move relatively along its surface during the rotation to adjust the distance between the two groups of mounting components 2, and then places the display screen body 1 between the four groups of clamping blocks 201 that are symmetrical up and down, and fixes the first adjusting bolt 204 in the first limiting hole 203 at the corresponding position so that the two groups of relatively arranged clamping blocks 201 tightly clamp the upper and lower ends of the display screen body 1, and then by screwing the second adjusting bolt 206, the limiting block 205 cooperates with the clamping block 201 to clamp the front and rear ends of the display screen body 1 frame, and by setting an adjustable mounting component 2, it can be used to install and fix display screens of different sizes, and then the second adjusting component 4 is used to adjust the display screen body 1 to a suitable height, and by tightening the third adjusting bolt 403 on the second telescopic sleeve 401 with different The second limiting holes 402 are connected and fixed to adjust the length of the second telescopic sleeve 401 to change the height of the display screen body 1. The height can be adjusted by setting the second adjusting component 4 to meet different usage requirements. Then, the display screen body 1 is pushed to the corresponding position, and the universal wheel 7 is used to push and adjust it to a suitable angle. Finally, the support base 6 is supported and fixed by the balancing component 5. The suction cup 503 is controlled to move downward by screwing the fourth adjusting bolt 502 until the suction cup 503 is tightly attached to the ground. By setting the universal wheel 7 at the lower end of the support base 6, it is convenient to move the display screen body 1 to the corresponding position, and it is also convenient to adjust the angle of the display screen body 1 by pushing the display screen body 1 so that the universal wheel 7 adjusts the sliding direction. By setting the balancing component 5, the stability of the display screen body 1 can be maintained during its operation. The suction cup 503 can be controlled to move up and down by screwing the fourth adjusting bolt 502, so that the stability of the support base 6 can be maintained by adjusting the suction cup 503 to tightly adhere to the ground when the display screen body 1 is working.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An adjustable positioning and lifting bracket for installing a display, comprising a display screen body (1); characterized in that: The invention also comprises a mounting assembly (2), a first adjustment assembly (3), a second adjustment assembly (4), a balancing assembly (5), a support seat (6) and a universal wheel (7); the rear end of the display screen body (1) is symmetrically and detachably mounted with two groups of mounting assemblies (2) for mounting and fixing the display screen body (1); the lower ends of the two groups of mounting assemblies (2) are fixedly connected with first adjustment assemblies (3) for adjusting the spacing between the two groups of mounting assemblies (2); the lower ends of the first adjustment assemblies (3) are symmetrically and fixedly connected with two groups of second adjustment assemblies (4) for adjusting the height of the display screen body (1); the lower ends of the second adjustment assemblies (4) are fixedly mounted with a support seat (6) for supporting; the left and right ends of the support seat (6) are both fixedly connected with balancing assemblies (5) for maintaining the stability of the support seat (6); the lower end of the support seat (6) is symmetrically and provided with two groups of universal wheels (7) for facilitating the movement of the display screen body (1) and the adjustment of its angle.

2. The adjustable positioning and lifting bracket for mounting a display according to claim 1, characterized in that: The mounting assembly (2) comprises a clamping block (201), a first telescopic sleeve (202), a first adjusting bolt (204), a limiting block (205), a second adjusting bolt (206), an anti-slip pad (207) and a protective layer (208); the clamping block (201) is provided with two groups symmetrically arranged in an upper and lower manner; the two groups of clamping blocks (201) are connected by adjustment through the first telescopic sleeve (202); a plurality of groups of first limiting holes (203) for adjusting the length of the first telescopic sleeve (202) are evenly arranged on the outer side of the first telescopic sleeve (202) from top to bottom; a first adjusting bolt (204) for fixing the first telescopic sleeve (202) is provided on the outer side of the first telescopic sleeve (202); the first adjusting bolt (204) is connected to different first limiting holes (203) to adjust the length of the first telescopic sleeve (202).

3. The adjustable positioning and lifting bracket for mounting a display according to claim 2, characterized in that: A limit block (205) is provided on the inner side of the clamp block (201) for cooperating with the clamp block (201) to clamp and fix the display screen body (1); a second adjusting bolt (206) is provided at the front end of the clamp block (201) for adjusting the position of the limit block (205); the second adjusting bolt (206) passes through the outer side of the clamp block (201) and extends to the inner side to control the movement of the limit block (205); an anti-skid pad (207) for protecting the display screen body (1) and increasing friction is provided on one end of the limit block (205) away from the second adjusting bolt (206); and a protective layer (208) for protecting the display screen body (1) is provided on the inner side of the clamp block (201).

4. The adjustable positioning and lifting bracket for mounting a display according to claim 1, characterized in that: The first adjustment component (3) comprises a support plate (301), a bidirectional threaded rod (303), a slider (304) and a drive motor (305); a slide groove (302) for the slider (304) to slide is provided at the upper end of the support plate (301); a bidirectional threaded rod (303) for rotation is installed inside the slide groove (302).

5. The adjustable positioning and lifting bracket for installing a display according to claim 4, characterized in that: Two sets of sliding blocks (304) are symmetrically sleeved on the outer side of the bidirectional threaded rod (303), and an output shaft is provided on the driving motor (305). The output shaft of the driving motor (305) passes through the outer side of the supporting plate (301) and extends to the inner side to drive the bidirectional threaded rod (303) to rotate.

6. The adjustable positioning and lifting bracket for mounting a display according to claim 1, characterized in that: The second adjustment assembly (4) comprises a second telescopic sleeve column (401) and a third adjustment bolt (403); a plurality of second limiting holes (402) for adjusting the length of the second telescopic sleeve column (401) are evenly arranged on the outer side of the second telescopic sleeve column (401) from top to bottom; a third adjustment bolt (403) for fixing and adjusting the length of the second telescopic sleeve column (401) is arranged on the outer side of the second telescopic sleeve column (401); the third adjustment bolt (403) is connected to different second limiting holes (402) to adjust the length of the second telescopic sleeve column (401).

7. The adjustable positioning and lifting bracket for installing a display according to claim 1, characterized in that: The balancing assembly (5) comprises a supporting block (501), a fourth adjusting bolt (502) and a suction cup (503). A suction cup (503) for sucking the ground is provided below the supporting block (501). The suction cup (503) is adjustably connected to the supporting block (501) via the fourth adjusting bolt (502). The fourth adjusting bolt (502) passes through the upper end of the supporting block (501) and extends to the lower end to control the suction cup (503) to move up and down.