Those costco chairs seem pretty nice. I copied the design I mentioned from the monstrans folding chair:
Their variant uses bamboo plywood, I figured it can't hurt to at least spend an hour or two and build a prototype out of 3/4" ply and see what happens when I park my butt on one - I'll use the same ply as the work table surface anyway.
My "seat of pants" feeling is that it might work simply because most of the frame work is in a vertical orientation and pretty strong that way. I could always get them waterjet cut from aluminum plate! ;)
I am planning on utilizing retainer straps on the mattresses. The design is intended to use the ikea malfors mattress and the ikea luroy slatted bed base. The bed base slats will be retained with a strip of metal covering the ends of the slats so they don't fall out of the frame, and allow for flexing.
Part of the folding design is to "encourage" the kids to keep their things neat. I don't want the bunks to become holes to collect kid cruft.
Originally Posted by Vlad
Thanks for more visual explanation. Now it all make sense.
A couple of things to consider:
I do see you have a great idea how to utilize space properly but I see a potential problem. You (or somebody) will have to fold/unfold beds every time somebody wants to sleep/have a nap etc. This will be a fun at the beginning but later.... you know.... So you have to make it almost automatic.
1. I would fasten mattresses to bed's frames (velcro, nails, screws, superglue, etc)
2. I would use bed sheets with elastic bands (like toddlers sheets).
3. I would have a bed cover with elastic bands attached on the inside side of the mattress(the wall side). You will have to pull it toward you and cover the bed in one move, then you can lift the bed.
The other thing is your chairs. I think regular 3/4" plywood won't hold. You will have to reinforce it with some crazy epoxy/fiber mix. We have very nice very strong very compact foldable chairs from Costco:
They don't fold to nothing like yours(3/4") but you have enough room under lower bank bed when it is down and when bed is up you will need chairs anyways. This will also give some head room and you won't need to lift chairs up and attach them every time.....