| 主权项 |
1. A trimmer head for use with a rotary powered trimming device for cutting vegetation, said trimmer head comprising:
A housing molded as a single unitary piece having a first upper surface and a second opposed lower surface and having a central opening for operable connection to a powered trimming device; A series of reinforcing ribs molded into at least one of the first surface or the second surface of said housing; A single generally cylindrical shaped recessed cavity located on said first upper surface, the cavity having interior walls comprising a series of molded vertically extending reinforcement members and the cavity having a bottom comprising a ring-shaped ridge extending around the interior perimeter thereof, said ridge having an upper edge; A single pivoting line holder capable of holding a folded strip of trimming line, the line holder having a generally cylindrical housing and a lower flange radially extending from the lower periphery of said line holder housing, said line holder housing and lower flange shaped and sized to fit within said recessed cavity, said lower flange height being less than the height of said ring-shaped ridge; A metal bearing ring having an upper edge and a lower edge, said bearing ring fitting firmly within said recessed cavity reinforcement members, the lower edge of said bearing ring supported by said cavity ridge, the diameter of said bearing ring being smaller than the diameter of said pivoting line holder lower flange; Said pivoting line holder having a central vertical axis about which it spins freely within the recessed cavity; and A weighted mass molded into said housing opposite said recessed cavity to enable said housing to spin at high speed without excessive vibration. |
