Wheels and castors
Manual forklifts

Wheels (figures 1 and 2 ) are obviously one of the most important components of a cart, as without them the load-carrying element would be no more than a stretcher or a sledge.

First of all, you need to know that a roulette wheel is not a small wheel, but a wheel mounted inside a clevis.

The wheel, invented 3,000 years BC by the Sumerians, is arguably the greatest invention of all time, and it's not without reason that there's a popular saying that "everything runs like clockwork" when things are going well.