I'm stripping the lath and plaster out of an upstairs room* so I can insulate. After one small wall of the dormer I had 4 bags of plaster at about 40kg each, three flights of stairs and a rapidly approaching 50 year old body told me I needed a different solution to carrying the estimated 40 more bags of spoil!
Queue the opportunity to build something. Here's my solution, a couple of 4.2m long 120mmx45mm** long beams, a 25mm galvanized running bar, and couple of shoes in the floor that the contraption slides into so that it can be installed and removed easily, and the window popped back in place. I was just tying the bags on the rope but this was slow and a bit sketchy, so I now have a 1/2 tonne building bag and carabiner.
Load testing was conducted at ground level with a much lower angle and me standing on the end bouncing, 110kg caused some deflection (100mm) but nothing too worrysome and no scary noises. The bar is installed perpendicular to the beams and they are them splayed into the shoes, this puts bunch of force on the bar and stops it moving, but it will slip out easily when not splayed out so the whole contraption can be stored out the way whilst working.
The friction of the running bar works well to limit the effort to lower a sack, and makes it more controllable. I would not want to lift anything on it as with a fully loaded bag it takes all my strength to move it upwards even a fraction.
Fitz
* had to take two showers as it is filthy work!
** is that 6"x2" in old money with some shrinkflation, or is a 5"x2" a thing now?