With a background in toolmaking, the 37-year-old football fan watched people taking home-made tin horns to games in the 1990s and decided to try producing his own in plastic.
Van Schalkwyk initially named his horn the boogie-blaster, but fans dubbed it the vuvuzela -- which means 'pump' or 'lift up' -- and the fad was born. Today, the vuvuzela industry is worth 50 million rand ($6.45 million) in South Africa and Europe, he estimates. He declined to say how much he had made from his invention.
"The vuvuzela is a symbol of the way we can celebrate and how we would like the rest of the world to enjoy their celebrations as well."
The fact it has been much copied does not irk him, he says. "We were never under the illusion we'd have a monopoly on the product and we couldn't patent the design. When we started out we were told a horn is a horn and it has been around for centuries!"
Horns have always played a part in South African culture, from the earliest kudu horns, traditionally used to announce a ceremony or a major event.