ALEXANDRIA, Va., Feb. 5 -- United States Patent no. 12,213,403, issued on Feb. 4, was assigned to MILWAUKEE ELECTRIC TOOL Corp. (Brookfield, Wis.).
"String trimmer head and spool" was invented by Beth E. Cholst (Wauwatosa, Wis.) and Troy C. Thorson (Cedarburg, Wis.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A spool and a trimmer head. The trimmer head includes a housing defining a cavity and rotatable about an axis. A spool is supported in the cavity and operable to support line to be dispensed. The spool is movable along the axis relative to the housing, and the spool and the housing define cooperating conical surfaces to center the spool during movement of the spool toward and in a position relative to...