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A pop-up trundle bed is a type of bed that consists of two separate mattress platforms—one main bed and one trundle bed—that can be conveniently stored beneath the main bed when not in use. Here's how a pop-up trundle bed typically works:

1. Storage Position: In its storage position, the trundle bed is tucked underneath the main bed. It is usually on wheels or casters, allowing for easy mobility and access.

2. Pop-Up Mechanism: When you need an additional sleeping surface, you can pull the trundle bed out from beneath the main bed. The pop-up mechanism comes into play here. On most pop-up trundle beds, the trundle bed is attached to a metal frame with a hinged mechanism.

3. Unfolding: To unfold the trundle bed, you typically need to lift the mattress platform slightly and release a locking mechanism. This action allows the trundle bed to be lifted and unfolded, usually to the same height as the main bed.

4. Locking in Place: Once the trundle bed is fully unfolded, it usually locks securely into place, creating a stable and comfortable sleeping surface. The locking mechanism ensures that the trundle bed remains in an elevated position and does not sink back down when weight is applied.

5. Mattress Placement: With the trundle bed in its fully extended and locked position, you can place a mattress on top of it. The mattress used for the trundle bed is typically thinner than the one used for the main bed since it needs to fit beneath it when stored.

6. Dual Sleeping Surfaces: Once the mattresses are in place, you have two separate sleeping surfaces—a main bed and a trundle bed—allowing for two people to sleep comfortably.

7. Retraction and Storage: When you no longer need the extra sleeping space, you can simply remove the mattress from the trundle bed, unlock the mechanism, and fold the trundle bed back into its stored position beneath the main bed.

It's important to note that the specific operation and design of pop-up trundle beds may vary depending on the manufacturer and model. Always refer to the manufacturer's instructions and guidelines for the particular pop-up trundle bed you own or are considering purchasing.