“Sofa bed mechanism” gets used for a few different things, and that’s exactly why sourcing goes wrong — someone orders a hinge when the sofa actually needs a pull-out track, or vice versa. Let me show you the two main types we deal with and how to tell them apart.
The two types people actually mean
Pull-out sofa bed mechanism
This is the system that slides the bed out from inside the sofa — usually on wheels or a track. We list three:
– 301 — dual wheel
– 302 — single wheel
– 303 — drawer type
The “dual wheel / single wheel / drawer” in the name tells you the variant. It does not tell you wheel diameter, load, or track length — confirm those separately if they matter.
Sofa bed hinge
This is the pivoting hardware that folds the bed section. Our range:
– 304 — Sofa Bed Hinge (large)
– 305 — Sofa Hinge (plate)
– 306 — Spring Hinge (small)
– 307 — Spring Hinge (medium)
– 309 — Spring Hinge (split spring)
A hinge folds; a pull-out mechanism slides. Different motion, different hardware, different catalog models.
How to tell which one your sofa needs
- Does the bed slide out on a track? → pull-out mechanism (301–303).
- Does the back or seat fold on a pivot? → hinge (304–309).
- Not sure? Send photos of the existing hardware from a few angles. The motion tells the story.
One more trap: “large / small / medium” in our model names are official labels, not dimensions. A “large” hinge and a “medium” one differ in size, but the word alone isn’t the measurement — confirm the actual numbers.
Don’t confuse these with ratchet hinges
Ratchet sofa hinges are a separate family (adjustable, multi-position). If your hardware tilts and holds at angles, it may be a ratchet hinge, not a sofa-bed hinge. Keeping the categories separate is how you avoid ordering the wrong thing.
FAQ
What is the difference between a pull-out mechanism and a sofa bed hinge?
A pull-out mechanism slides the bed out on a track (301–303); a hinge folds the bed section on a pivot (304–309). Different hardware, different models.
Which Xiongfa models are pull-out mechanisms?
301, 302, 303 — dual wheel, single wheel and drawer variants.
Which are the spring hinges?
306 (small), 307 (medium), 309 (split spring). All iron, galvanization or black.
Are sofa bed hinges the same as ratchet hinges?
No — ratchet hinges are a separate, adjustable category. Don’t use “adjustable sofa hinge” if you actually need a pull-out mechanism or a spring hinge.
For the full type list with catalog details, the Sofa Bed Mechanism Types guide is the source page. For replacement parts, the sofa bed hardware & parts page covers kits and spares.
[…] Sofa Bed Mechanism Types: pull-out vs hinge, explained […]