A sofa – bed typically uses a mechanical system to transform between a sofa and a bed. Here’s a general overview of how it works:
Frame and Hinges
The frame of the sofa – bed is specially designed. It usually has a metal or strong wooden structure. There are multiple hinges or pivot points. In the sofa position, the seat and backrest are at a certain angle for sitting comfortably.
When converting to a bed, the backrest can be pushed or pulled (depending on the mechanism design) to flatten out, so that it lies in the same plane as the seat section. For some sofa – beds, the seat may also slide forward slightly to create a more even sleeping surface.
Frame and Hinges
There are support mechanisms such as slats or additional frames that unfold or extend to hold the sleeping surface. Some sofa – beds have a thin mattress that is either attached to the frame or removable. This mattress may be made of foam, spring – loaded materials or a combination of both, depending on the quality and intended use of the sofa – bed.
In some advanced designs, there may be a lever or lock – release system. For example, you pull a lever near the bottom of the sofa – bed, which then allows you to smoothly adjust the position of the different parts to convert it from a sofa to a bed.
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