Up and down movement of a monitor

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Various mechanical mechanisms can be employed for the up and down movement of a monitor within a table slot, particularly for training or conference rooms. Options discussed include counterweights, pulleys, and lever systems that allow for manual operation without powered components. The design should prioritize simplicity and ease of use, enabling the monitor to retract smoothly when not in use and rise easily when needed. Servomechanisms are mentioned as a potential solution, but the focus remains on purely mechanical systems. Overall, the goal is to create an efficient and user-friendly mechanism for monitor mobility.
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I want to know the various mechanisms for up and down movement of a monitor inside the slot of a table. This is used in the training or conference rooms wherein when the monitor has to go down when not in use inside the slot to the bottom of the table and come up by pushing or actuating with any mechanism for the usage.

No powered mechanisms.
 

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I think, it can be made easily by servomechanism.
 
but no powered movement. Has to be purely mechanical and simple
 
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