Method and apparatus for sharpening end of filament in vegetation filament-trimmer
OwnerCharles B. Pittinger, Sr.inventor
Life of this patent
Estimating the term…
Abstract
An abrasive or other filament-working member is mounted at the sweep circle of a vegetation trimmer filament for progressively sharpening the end of the filament and removing excess filament during operation of the vegetation filament-trimmer; the filament working member may include means causing the filament to heat.
Claims10
In the combination of a vegetation filament-trimmer having a filament with an inner end and an outer end, a drive connection with the inner end for sweeping the outer end in an intended path, and means on the filament trimmer for working the sweep of said outer end to said intended path on operation of the drive, the improvement comprising:
- the means for working including means for progressively shaping under centrifugal force on sucessively shorter radii the filament outer end to a predeterminable squared-off end shape, and means for holding the means for progressively shaping proximate said intended path.
In the combination of a powered vegetation trimmer having a filament and a drive for swinging a terminal portion thereof in an intended orbit during operation, and means for working the terminal portion during operation, the improvement comprising:
- the working means including a member having a forward extension outwardly curved for receiving and directing inwardly said terminal portion, and means for holding said member proximate at least a portion of the intended orbit during operation.
A process for sharpening the free end of a filament having one end connected to the drive of a vegetation filament-trimmer, comprising the steps:
- a. orbiting the free end of the filament by operating the drive, and
- b. during said operating progressively shortening the free end of the filament, by causing same to contact on progressively shorter radii successive portions of a filament working member, thereby sharpening said free end, during said contact.
Dependencies are inferred from the claim text.