I have a TV here which weighs around 15 kg. It fits perfectly into the alcove next to my chimney breast, but that's not a convenient viewing angle. So what I want to do is build an arm which attaches to the wall and can swing out and let me use it, and also swing right back in to allow the TV screen to tuck back out of the way.
So I designed this thing here. It's essentially two frames inside eachother. The inner frame is designed to transfer the weight of the TV to the left-hand side, which is attached by hinges to the outermost frame. That's why the bottom-most part of the innermost frame is at that angle. I believe that will transfer the weight in the expected direction.
Then the outer frame is the same, but in reverse. It transfers the weight from the left-hand side to the right-hand side, where it will attach in the same way, by hinges, to a post that's firmly bolted to the wall.
I put half dovetailed lap joints in all corners except the one with an acute angle. That's because that joint will experience more of a compressive force, so a bridle joint will probably fit okay there. And I think they're easier to cut so that's why I chose it. And the halfdovetaillapjoints are for joints which I think will be more pulled apart at, than pushed together by the weight of the TV. The idea is to glue and clamp these joints. I possibly will not need to use screws.
The whole thing will be made from 1.5"x1.5" pine.
Is this design going to work as I think it will? That is, will the weight be transferred in the manner that I expect?