ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,765, issued on May 27, was assigned to Joy Global Surface Mining Inc (Milwaukee).
"Dipper door and dipper door trip assembly" was invented by Matthew L. Gross (West Allis, Wis.), Joseph J. Colwell (Hubertus, Wis.) and Richard Nicoson (Hartford, Wis.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A mining machine includes a boom, a handle coupled to the boom, a dipper coupled to the handle, and a dipper door pivotally coupled to the dipper. The mining shovel also includes a dipper door trip assembly including a trip motor coupled to the boom, a trip drum coupled to the handle, a linkage assembly coupled to the dipper door, a first actuation element e...