The other issue with the hollow bars is that if enough weight was placed on a spot they would begin to bend. The issue became so bad that a 90 day warranty was put in place by most manufacturers of these frames. Another issue the black metal frames suffered from were bending stretcher bars or rails. Again the hollow nature of these strecther rails presented issues with breakage and bending.
Secondly, it should be borne in mind that it isnt the futon frame that provides the comfort when either sitting or sleeping on a futon: it is the futon mattress that provides the comfort. A futon bed mattress made for a tri-fold futon frame is not as thick as that for a bi-fold futon bed frame. Therefore, if you intend to sleep on your futon regularly you might be best to buy a bi-fold futon bed mattress: a thicker mattress tends to provide more support.
Some click-clack beds have traditional arms that are removed, while others are designed so the head and foot of the bed bend up to create armrests when it is in a couch form. Some types of furniture are incorrectly called futons. Often, manufacturers call a platform bed a futon. These types of futons are sold for pets as well as humans. Futon mattresses are mattresses stuffed with a cotton blend.
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