ALEXANDRIA, Va., March 12 -- United States Patent no. 12,246,428, issued on March 11, was assigned to MAKITA Corp. (Anjo, Japan).
"Striking tool" was invented by Kiyonobu Yoshikane (Anjo, Japan) and Mizuki Yamamoto (Anjo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Two balls can reliably retract for smooth insertion of a tip tool into a tool holder. A hammer drill includes a tool holder, two balls in reception holes in the tool holder, a guide washer urging the balls forward in the reception holes with a coil spring, a pressure ring adjacent to a front of the guide washer, and an operation sleeve allowing the pressure ring to move backward and forward between locked and unlocked positions of the two...