Tri-fold pull-out
The most common pull-out. A steel frame folds in three and sits inside the sofa base under the seat cushions. You lift a strap or handle, pull the frame toward you and unfold the legs.
Because the mattress folds three times into a limited space, it's usually thin: around 11 to 15 cm (4.5 to 6 in). The frame is supported by a deck, which may be a fabric or wire mesh with springs, or wooden or metal slats.
Bi-fold pull-out
The frame and mattress fold only once. This leaves room for a thicker mattress and avoids one of the folds you can feel when lying down. Bi-fold mechanisms need a deeper sofa base, so the seat depth and the closed sofa tend to be larger.
Click-clack
A hinge between back and seat locks in set positions with an audible click. To flatten it, you lift the seat until the hinge releases, then lower it. There is no separate mattress; you sleep on the seat and back upholstery.
The hinge is the part that wears. Look for a metal mechanism with a smooth action and a frame that doesn't flex when you push on one corner.
Pull-forward (roll-out)
The base of the seat rolls forward on castors or runners, and the back cushions drop into the gap to form a level surface. Common in sleeper sectionals and corner sofas.
- Quick to use and no frame to unfold.
- Comfort depends on the cushion foam, since you're sleeping on seat cushions.
- Check that the gap between sections is filled and level.
Lift-up and storage chaise
The seat of a chaise section lifts on gas struts to reveal storage for bedding. It isn't a bed mechanism on its own, but it pairs well with a pull-forward bed and solves the problem of where to keep pillows and duvets.
Decks and supports
| Deck | How it feels | Notes |
|---|---|---|
| Fabric deck on springs | Soft, can sag in the middle over time | Common on older and lower-cost pull-outs |
| Welded wire mesh | Firmer and more even | Reduces the "bar in the back" feeling |
| Wooden or metal slats | Firm, like a normal bed base | Good with thicker mattresses; check slat spacing |
What wears out first
- Hinges and rivets on pull-out frames, especially if the bed is opened by pulling one corner.
- Springs on fabric decks, which stretch and let the middle dip.
- Click-clack hinges, if the sofa is regularly sat on while half-open.
- Seat foam on pull-forward beds, which compresses faster when slept on nightly.
How to test a mechanism in a showroom
- Open and close it yourself, twice, without help from staff. Note anything that sticks.
- Lie down in your usual sleeping position for a few minutes and feel for bars, gaps and folds.
- Sit on the edge of the opened bed. A good frame shouldn't tip or rack.
- Ask what the frame and deck are made of, and whether the mechanism has its own warranty.
Shopping online? Ask for the opened dimensions, mattress thickness and deck type before you order, and check the returns questions.