How the Hula Hoop Works

A 1963 patent for a lightweight, rigid plastic hoop designed to rotate around a human waist through rhythmic body movements.

What it covers

The patent describes a circular hoop made of rigid, hollow plastic tubing. It specifies a diameter of 30 to 40 inches and a weight between 6 and 12 ounces. The core mechanism relies on the hoop being stiff enough to maintain its circular shape while the user moves their body. This rigidity ensures that the side of the hoop opposite the user's body stays far enough away to create the necessary momentum for continuous rotation.

What it doesn't cover

• —Does not cover hoops made of non-rigid or flexible materials like rope or fabric.
• —Does not cover hoops with diameters significantly outside the 30 to 40-inch range.
• —Does not cover weighted hoops designed for exercise that exceed the 12-ounce weight limit.
• —Does not cover collapsible or segmented hoop designs.

The clever bit

The innovation lies in the specific balance of low weight and high rigidity; if the hoop were too heavy, it would be hard to start, and if it were too flexible, it would deform and lose the centrifugal force needed to stay up.

Why it matters

This patent formalized the design of the Hula Hoop, which became one of the most successful toy crazes of the 20th century. By defining the specific ratio of weight to rigidity, it established the physics required for a mass-produced toy to be easily kept in motion by a child or adult.

Real-world examples

• 1.Classic Wham-O Hula Hoops
• 2.Standard plastic toy hoops found in school gym classes