ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,886, issued on Dec. 2, was assigned to SEIKO EPSON Corp. (Tokyo).
"Torque transmission mechanism" was invented by Keitaro Hashizume (Shiojiri, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A torque transmission mechanism includes a first member having a cylindrical shape and configured to be rotatable around a rotation axis, the first member including an outer peripheral surface provided with a first groove having a zigzag shape extending around the rotation axis, a second member having an annular shape surrounding the first member and configured to be rotatable around the rotation axis, the second member including an inner peripheral surface ...