we had a swing made from 2 lengths of rope and a piece of wood, hanging from a beam of the "shanty" (that's what we called it - was an old chicken coop actually) in one of our backyards (we had 3 - first yard was a formal garden, back yard was where grandpa grew veggies and had fruit trees, and the back back yard was where the old trolley line used to pass thru...)
the swing wasn't up very long - as a child, i remember using it once and fell off, scraping my knee - grandpa removed it after that
i should mention we lived in my grandparents (100+ year old) house - my mother grew up there, and she and my aunts used that swing for many years - until along i came, klutz that i was!