By 16aaygh. Futon. At Friday, August 10th 2018, 04:15:28 AM.
The first problem with black metal frames is the round metal bars that make up the seat and back sections of these frames. Where as wood futon frames are using flat slats, black metal frames have hollow round bars. Thinner mattresses would slide through the gaps between the round bars. On wood futons this was never a problem. 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.
Traditionally, a futon is a wooden frame that can be transformed into a couch or a bed. This piece of furniture has been altered by manufactures so that the word can be defined as a piece of furniture that serves more than one purpose.
The first futons were referred to as tri-fold. Tri-fold means that three sections make up the frame of the futon and as such the futon operates using these three sections to create the sleep surface and seating. Early models required locking pins but more modern designs were developed that did away with this by incorporating an improved design that folded up under itself. The only thing not going for these frames is that they would sit very low to the ground making them a great choice only for those who get in and out of them easily. Today you'll find these frames offered in more specialty futon stores as they are typically made from pine and are left unfinished. Tri-fold futons are still sold today and usually offered at much lower price points.