ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,864, issued on May 27.
"Connecting rod stabilizing structure for herringbone ladder" was invented by Qiulan Hu (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to the technical field of ladders, and in particular to a connecting rod stabilizing structure for a herringbone ladder. The connecting rod stabilizing structure for a herringbone ladder includes a transverse tube and two connecting rod structures. The connecting rod structure includes a first connecting rod and a second connecting rod. One end of the first connecting rod is fixedly sleeved with a connecting sleeve. A latch stick is slidably connec...