ALEXANDRIA, Va., June 17 -- United States Patent no. 12,311,518, issued on May 27, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"Impact drill" was invented by Wei Lu (Nanjing, China) and Changwei Zuo (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An impact drill includes a lock pin, a biasing element, a function conversion member and an operation member. The lock pin is connected to the locking ring. The biasing element is connected to the lock pin and provides a biasing force that causes the lock pin to press against the locking ring. The function conversion member includes a stop portion configured to stop the movement of the lock pin along the first axis and a releas...