US Patent 12115407 Dumbbell having a threaded connection for adding weight plates

A dumbbell having a threaded connection for adding weight plates. The dumbbell is a resistance training device. The dumbbell is configured for use in resistance exercise. The dumbbell comprises a center shaft, a plurality weight plates, a plurality of collar plates, and a plurality of end caps. The plurality weight plates, the plurality of collar plates, and the plurality of end caps attach to the center shaft. The plurality of collar plates and the plurality of end caps secure the plurality weight plates into a fixed position on the center shaft. The center shaft, the plurality weight plates, the plurality of collar plates, and the plurality of end caps are interconnected using threaded connections.