US Patent Issued to Koki Holdings on Oct. 6 for "Work machine" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,752,408, issued on Oct. 6, was assigned to Koki Holdings Co. Ltd. (Tokyo).

"Work machine" was invented by Toshinori Yasutomi (Ibaraki, Japan) and Takashi Kawamata (Ibaraki, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A nailer includes a case part with hollow shape and a piston part. The case part includes a cylinder. The piston part defines a pressure chamber inside the case part and strikes a fastener by moving to a lower side due to a pressure of a gas in the pressure chamber. The piston part includes: a base member including a sidewall; an X-ring attached to the base member to be interposed between the sidewall and the cylinder; and an O-ring...