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US 6,279,235 B1Granted
Filament trimmer head
AssigneeThe Tord Company
InventorsDonald M. White, III, Chris A. Wadzinski
Life of this patent
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AssigneeThe Tord Company
InventorsDonald M. White, III, Chris A. Wadzinski
Estimating the term…
A filament trimmer has an improved trimmer head. The trimmer head includes a spool having crush ribs on its core to prevent contraction of the filament line from warping or otherwise damaging the spool. A slot shaped exit aperture is provided in the head which can be opened up when the head is disassembled to allow the filament line to be more easily placed therein, but which will be closed when the head is fully assembled and will constrain the line against excessive vertical movement. The head includes a line indexing system for feeding out additional line in which one of the groups of the conventional teeth in such system are vertically spaced away from the spool flanges and are placed on a spool core extension. A dirt seal is provided to help prevent from passing around the ground engaging member of the indexing system. Finally, the head includes a self threading drive shaft that forms the attachment threads for the head into the head when the head is threaded onto the drive shaft.
An improved filament trimmer of the type having means for retaining a supply of filament line with a free end of the line extending radially outwardly from the filament retention means to form a cutting length of line, the filament retention means having a core on which the filament line is wound to form the supply thereof, and drive means for rotating the filament retention means about an axis to cause the cutting length of line to be spun in a cutting plane to sever vegetation, wherein the improvement relates to the filament retention means and comprises:
An improved filament trimmer of the type having means for retaining a supply of filament line with a free end of the line extending radially outwardly from the filament retention means to form a cutting length of line, the filament retention means having a core on which the filament line is wound to form the supply thereof, wherein the filament retention means comprises a spool having parallel upper and lower spool flanges that are secured to the core at spaced apart locations and extend generally perpendicularly outwardly from the core, the filament line supply being wound around the core and being contained between the upper and lower flanges of the spool, and drive means for rotating the filament retention means about an axis to cause the cutting length of line to be spun in a cutting plane to sever vegetation, wherein the improvement relates to the filament retention means and comprises:
Dependencies are inferred from the claim text.