ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,228, issued on Sept. 30, was assigned to Daifuku Co. Ltd. (Osaka, Japan).
"Frame unit" was invented by Kazuharu Yoshinaga (Hinocho, Japan) and Takashi Akiyama (Hinocho, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A frame unit includes door members that are provided in correspondence with openings and change in orientation between an open orientation in which the openings are open and a closed orientation in which the openings are closed, and a door drive section that drives the door members in order to cause the door members to change in orientation. The door drive section includes a drive source and a transmission mechanism that transmits...