ALEXANDRIA, Va., March 5 -- United States Patent no. 12,240,091, issued on March 4, was assigned to Witman Corp. (Changhua, Taiwan).
"Hammer structure" was invented by Hui-Ni Lin (Changhua, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hammer structure includes a hammer body, at least one hitting block, a compression spring, and a shaft. The hammer body has a radial through hole. The hitting block includes a mounting portion having an accommodating hole. The compression spring is accommodated in the accommodating hole. The shaft is inserted through the compression spring so that it can be elastically extended and retracted via the compression spring. The mounting portion of the hitting block is scr...