I designed a set of convertible floor cushions that turn into a footrest!
They can be buttoned together in a stack (footrest mode), buttoned together in a square (big floor cushion mode), or used individually (cushions mode).
I started off with this big 1-metre square foam floor cushion, which I liked but was hard to store when not in use.
I wanted to keep the option of a big floor cushion without it having to just lurk behind the sofa. At the same time, I wanted an extra footrest. So I decided to find a way to make the cushion convertible in some way.
For a while I toyed with having it fold up like a monopoly board. But I couldn't come up with a way to construct and secure the cover without bulky zips everywhere.
So then I considered just making four separate cushions that could be secured together in different configurations. For a while my best idea was to have something like a belt or strap, which could either go around the circumference of the 2x2 floor layout, or around the stack. But I didn't like the idea of having to deal with that band as a loose separate item.
@cassolotl had the genius idea to use loops to chain up the sides to keep the cushions together in a stack. I was doubtful at first because it didn't solve the problem of attaching them together in the floor layout. But then I figured out that adding buttons in the right place relative to the loops would make it possible to secure all three configurations. Which I'll demonstrate at the end of the post!
So the first step was cutting the big cushion down into four equal pieces. Well, the first-first step was trimming it down to clean up the section that was destroyed by my rabbit, who liked to burrow against the cushion and somehow managed to shred the foam *through* the cover.
I cut the foam with a hand saw, which was quite easy and satisfying.
Then making the cushion covers. I made strips of straight-cut binding and tucked loops into the corners while I sewed together the side pieces of the cover.
I decided to add piping to the top for aesthetics and structure. I've never done piping before but it wasn't too bad to get the hang of.
Because I dislike both zips and buttons (not specifically sewing with them, but just generally coming into contact with them in life) I decided not to bother making any closure on the underside of the cushions. Instead I just made the bottom piece of the cover in two triangles with a diagonal opening across the middle. A bit of strategic reinforcement stitching at the corners got the balance between making it possible to insert the cushions without the flaps flapping around too much.
Now for the details of the loop/button system. Each loop is positioned halfway up the height of the cover, at the corner. Each cover has two loops, at diagonally opposite corners. The loops extend 10cm, which is the exact thickness of the cushion foam.
Exactly 10cm to the right of each loop, I sewed on a big wooden button, also halfway up the height of the cushion.
For separate cushions mode, each loop is simply wrapped over its own neighbouring button to keep it from waving around or catching on things.
For big floor cushion mode, the cushions are butted together with their loop-corners touching each other around the perimeter of the square.
At each connection point, the loops from *both* cushions are wrapped around the button exposed on the perimeter. This holds all of the cushions together around the outside, and friction keeps them from slipping around in the middle.
For footrest mode, the loops are chained up through each other - the bottom cushion's loop is wrapped around the second cushion's loop, which wraps around the third cushion's loop, which wraps around the top loop.
Then, the top loop wraps around its own button to secure the chain.
I'm seriously SO proud of this system. It's so versatile and all three modes work perfectly!!!
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