ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,546, issued on June 3, was assigned to TADANO LTD. (Kagawa, Japan).
"Telescopic boom" was invented by Kenji Shimizu (Kagawa, Japan) and Kazuhiro Kobayashi (Kagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lightweight and high-rigidity telescopic boom in which strain during manufacturing is suppressed is disclosed. In a telescopic boom, a plurality of booms forms a telescope structure, and the telescopic boom includes a boom fixing mechanism that fixes a top boom disposed relatively inside at a predetermined position with respect to a first intermediate boom disposed relatively outside. The boom fixing mechanism includes a boom fixing pi...