I'm looking for a style of joinery to attach the mattress boxes in a bunk bed to the supporting posts. I tried inventing my own here and was correctly dissuaded.
The basic bed structure is from Ana White's Modern Bunk Beds and other online designs. The main difference is I want to build the mattress boxes as permanent units and be able to knock this down by removing them from the posts by unscrewing bolts.
Here's what I'm almost certain I want to keep:
- Material is pine.
- Posts are 4x4, mattress box sides are 2x6, cleats are 2x2, slats are 1x4, everything else is 2x4.
- Mattress boxes should be permanent (i.e. 78x38 boxes with glued sides, cleats, and probably glued slats).
- One side will have a ladder so guard rails can't be counted on to hold the posts apart or together.
- No cuts more complicated than a half lap or dado. I also think I need to use bolts or screws rather than tusk tenons or the like.
- Boxes are attached to posts by bolts.
This is the rough structure and the joint in question:
It seems entirely possible that the posts will attach (at least partially) inside the frames. Or maybe they should be turned into a pair of 2x4 in an L arrangement.
I've looked at many online designs but I haven't found any that both do this and (given the importance of this joint) I trust.
What would you use?
Edit: added explicit mentions of bolts