US Patent Issued to Kone on Sept. 23 for "Method and a door drive unit for defining tension of a belt of an automatic door" (Finnish Inventors)

ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,083, issued on Sept. 23, was assigned to Kone Corp. (Helsinki).

"Method and a door drive unit for defining tension of a belt of an automatic door" was invented by Matti Mustonen (Helsinki) and Markku Jokinen (Helsinki).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for defining a tension of a belt of an automatic door includes exciting a resonant frequency of the belt to cause a vibration of the belt, obtaining motion data representing motion of an electric motor that moves the belt, defining vibration information representing the vibration of the belt based on the obtained motion data, and defining the tension of the belt based on the defi...