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.
Futon frames and mattresses can go just about anywhere, I havent seen a space that they dont accommodate. Ive seen the frames I sell go into third story rooms in those gorgeous 1800s New England Colonials. While they are beautiful homes, they are quite a chore to move anything into or out of. I have sold many Futon Frames and Mattresses to customers in New York City, where space is at such a premium, that Ive lost count.
Early designs involved a steel tooth design that would fit into pocket welds on the arms. These would snap off over use. The alternative design was to run a bolt through the arms and into the rails. While better it still did not address the issue of bending stretcher rails. Bent hinges also added another issue that would happen from use over time. While not as common as the other problems this issue still led to the failure of many black metal frames.
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