The hinges were attached to the arms of the futon frames with two bolts and two nuts. While this design was OK the hinges themselves would fail when too much weight was applied to one side or the other. These would also bend out rendering them useless in the operation of the futon. Most specialty futon retailers pay little to no attention to black metal futon frames. Retailers Ive spoken to have said that the black metal futon frame is the number one service headache when it came to futons with over 95% of service issues being the failure of a black metal frame component.
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.
But if space is at a premium and you will only occasionally sleep on your futon best, than the tri-fold will certainly suffice. The best futon bed mattress is the one that best suits your requirements. Consider the space you have available, and what will be the main function of the futon bed mattress. If the futon is going to be used regularly for sleeping on, then most consumer reviews of futon beds tend to favour the bi-fold futon frame and mattress.
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