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.
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.
This will also help create the ability to sleep extra guests if necessary. A love seat futon is shorter than a full, by 21 inches, but is still 75 wide. Lounge futons may be the size of a single bed. Futon dimensions for a single lounger are 25 x 75. Chair futons are not long enough for an adult to sleep on, unless it comes with an ottoman. Futon dimensions help people understand the amount of space they need in the designated room, and how many people they can sleep on the furniture.
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