ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,221, issued on April 14.
"Ladder that facilitates the contraction of handrails" was invented by Miaoren Chen (Jinhua, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A ladder that facilitates a contraction of handrails is provided. The ladder includes a front tube and a rear tube hinged to each other; an armrest frame sleeved on the front tube, a vertical rod of the armrest frame is inserted into the front tube and slides in cooperation with it; an elastic locking member that cooperates with the vertical rod, the elastic locking member can expand contract elastically in a radial direction of the vertical rod, thereby achieving fixation or unlo...