ALEXANDRIA, Va., June 6 -- United States Patent no. 12,280,473, issued on April 22.
"Power tool and main shaft thereof" was invented by Jeff Liu (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A main shaft of a power tool is sequentially divided into an impact section, a penetrative section and an output section, wherein the impact section is formed with an impact portion and has a curved recess defined therein, and the penetrative section is adapted to extend through a front portion of the power tool. The main shaft has a linear tunnel defined therein and extending therethrough. The linear tunnel has two opposite ends respectively defined as an inlet and an outlet, wherein the inlet is situ...