ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,079, issued on May 13, was assigned to Otis Elevator Co. (Farmington, Conn.).
"Roller speed sensor with magnets and sensors" was invented by Yu Pu (Farmington, Conn.) and Justin Billard (Amston, Conn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A roller speed sensor for detecting a speed of an elevator car of an elevator system including: a first roller configured to rotate along a guide rail of the elevator system when the elevator car moves up or down an elevator shaft, the first roller including: one or more magnets; and a first sensor pair located proximate the first roller, the first sensor pair being configured to detect a rotational speed ...