Filament vegetation trimmer

摘要

An automatic development reel type cutter head for a filament trimmer comprises a circular base member having a circular array of post-like upstanding members and a filament coil disposed about selected of the post-like upstanding members and inside of the remaining post like members. The filament coil has a free end portion which is automatically deployed outwardly from the coil as the cutter head is rotated by a drive shaft upon which the cutter head is mounted against one of the post-like members so as to project radially outwardly therefrom. As one free end portion wears and breaks off as a result of frictional contact with the post-like member from which it projects, another free end portion is automatically deployed outwardly from another post-like member. In one embodiment of the invention a filament retainer plate is disposed over only those post-like members about which the filament is to be wound. After the filament is wound about the post-like members covered by the retainer plate, a cover plate is positioned over all of the post-like members. In another embodiment of the invention, the cutter head comprises a quick change cartridge having a core upon which the filament is wound which is detachably assembled with respect to the circular base member with the coiled filament positioned outside of certain of the post-like members and inside of others. In one embodiment the quick change cartridge has a smooth core while in another embodiment the quick change cartridge has a core with plural parallel grooves in which the filament is wound, and a switch over gap across the grooves for switching the filament between grooves. In some forms of the inventions a low grade bonding material coats the filament winding to hold the windings together.