Metal rod blade and trimmer head utilizing same

A rotating trimmer head device comprising:

• a trimmer head having an inverted cup main section made out of plastic and consisting of a horizontal disk top section and a vertical annular wall section;
• said vertical annular wall section being structured to have a plurality of receptacles so as to accept metal or ceramic inserts;
• said inserts being structured to be inserted in the receptacles of said plastic inverted cup receptacles and having a cylindrical shape and to have a single internal spherical or conical socket opening starting on the inner concave side of the insert and traversing the vertical annular wall section toward the outside and creating a predominantly circular opening on the outer convex side of said insert;
• said predominantly circular opening on the outer convex side of said insert having further removed material on the outer convex side of said insert, on the trailing edge and trailing upper side, as defined by the rotational direction of the head when the insert is placed and assembled permanently or in a replaceable manner in a conventional manner in a receptacle on said plastic inverted cup;
• a plurality of spring-loaded retainers, each of said retainers having a spring section and a retaining section, being positioned according to an associated one of said internal spherical or conical socket openings on insert, such that the retaining section of each retainer is located directly behind said internal spherical or conical socket openings, and such that the distance between the retaining section surface is at a smaller distance than the sphere created by said internal spherical socket opening, or the inscribed sphere created by said internal conical socket opening;
• a plurality of metal rod trimmer blade assemblies, each trimmer blade having a length of a single solid rod and a sphere attached to one end of said solid metal rod, of slightly smaller diameter than the diameter of the sphere, or the inscribed sphere;
• defining said internal spherical or conical socket openings on the inserts of said trimmer head and traversing the vertical annular wall section toward the outside, where said metal rod trimmer blade assemblies enter rod first in said openings from the inside out and extend radially out of the rotating trimmer head device and snap into place at the spherical or conical opening of the cavities and retained into place by the spring loaded retaining section of said retainers.