Dirt Devil is a brand name of household vacuum cleaners and floor care.
The company was founded 1905 in Cleveland, Ohio, USA. In 1955 they built the first household vacuum with a patented Cyclone system. Since then over 25 million have been sold. Originally the company was called "Royal Manufacturing" and made vacuum cleaners with metal cases. In the 1980s they began selling the mass-market "Dirt Devil" line with plastic cases; originally the packaging said "Royal Dirt Devil" but over the years the name "Royal" appeared in smaller and smaller type until it vanished entirely from the package. Today the brand is "Dirt Devil", though they still manufacture the "Royal" line, though it is much more expensive and of a higher quality than Dirt Devil, and the corporate legal name is the rather anonymous "TTI Floor Care North America". TTI stands for Techtronic Industries, a Hong Kong-based firm and the makers of Hoover, Vax, and other vacuum cleaners.