Looks, to me, as if the two rails are notched so they slide into one another and lock , then, the two tails of those rails lock into the post that contains the 3 fingers. Nothing can pull out horizontally, only vertically.It will be obvious once it's explained but I'm wondering how this is done.
I would imagine it could be used for an apron although, I suspect that, over time, that joint would loosen a little bit. The picture the OP shows looks like a bed frame although I would think the same thing applies, over time that joint would loosen just a bit and cause some wobble. I could be wrong. I've never made that joint. Out of a hardwood would probably be better than what appears to be fir in the picture.What would a joint like this be used for? Could this be used for a table apron and legs?
Of course, you're right, Frank. That would make it a very strong joint. It just would no longer be a Japanese joint. That said, if I was going to use it, I would probably do just as you say.It would be a very strong permanent joint glued and pinned. As a knockdown joint it would likely be wobbly over time.
You could be right about that. I could not find this particular joint exploded anywhere, so I was merely guessing..Knowing how intricate the japanese joints usually are, I'd hazard a guess and say that while the two runners are notched to accept each other, they are probably also notched to lock onto the leg/post. Like an F.
But that's just conjecture.