ALEXANDRIA, Va., March 17 -- United States Patent no. RE50,828, issued on March 17, was assigned to Kanzaki Kokyukoki Mfg. Co. LTD. (Amagasaki, Japan).
"Driving-side pulley" was invented by Michio Tsukamoto (Amagasaki, Japan) and Takaya Inaoka (Amagasaki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A driving-side pulley includes a cam mechanism that presses a movable sleeve in a first direction by utilizing a relative rotation of the movable sleeve in the normal direction with respect to an axis-line-direction fixed member, the first direction being a direction that has a pressing surface pressed against a corresponding side surface of a belt."
The patent was filed on Oct. 8, 2021, under Applicatio...