|Twin-wheel caster by Caster Concepts|
Fisher, a prolific African-American inventor, developed the furniture caster, a free turning wheel that would allow workers to move heavy objects in furniture factories in a safe and effective manner. Most of the early casters were made of cast iron with leather tires for use on hard wood floors.
Today, heavy-duty industrial casters are still frequently made of cast-iron, but composite plastics are also used. Modern-day casters come in many forms and with a variety of features, such as brakes and direction locks. Casters used in an industrial environment are often shock absorbing and usually custom designed for their specific application. Factors such as noise reduction and worker health and safety also play a big role in the engineering of modern casters. Despite the popular idiom, wheels get reinvented almost every day!