| 摘要 |
A rotary cutting device primarily used for the cutting of vegetation and which includes an outer housing having a motor mounted within the housing. A bobbin assembly which stores a selected amount of a filament permits dispensing of the filament through a hollow drive shaft which is rotated by the motor. The lower end of the filament serves as a rotating cutting element. The bobbin assembly is capable of being shifted axially with respect to the drive shaft in order to dispense a selected amount of the filament when shifted to a lower position and which also prevents locking action of the filament against unauthorized withdrawal when the bobbin assembly is normally biased to its upper position. The rotary cutting device also includes an outwardly flaring lower skirt section which is provided with a recess having a balancing element such as a liquid or semi-liquid material contained therein for balance against both static and dynamic imbalance created by the rotary action.
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