In 1925, the US patent office granted Chomin Harry of Canada a patent for a skate frame that gave each wheel axle dual purposes: 1) interlocking with the inner race of double ball bearings, as an axle, and 2) being threaded into one sidewall of the wheel frame, as a bolt. This enabled easy wheel replacement, and allowed an ice blade to be attached in place of the wheels.
In 1925, the US patent office granted Chomin Harry of Canada a patent for a skate frame that gave each wheel axle dual purposes: 1) interlocking with the inner race of double ball bearings, as an axle, and 2) being threaded into one sidewall of the wheel frame, as a bolt. This enabled easy wheel replacement, and allowed an ice blade to be attached in place of the wheels.