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US 4,285,169 AGranted
Method of using vacuum lifted blade sharpener for rotary mowers
OwnerReginald T. Franklininventor
Life of this patent
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Abstract
Method and apparatus are disclosed for sharpening the blade of a rotary mower. Sharpening is accomplished by utilizing the upward vacuuming action created by the rotation of the blade. At present blades having downwardly turned cutting edges and upwardly turned trailing edges have been found to create the requisite vacuum for the operation of the sharpening apparatus.
Claims4
A method of sharpening a blade of a rotary mower, comprising the steps of:
- (a) placing a sharpening device on a level surface;
- (b) positioning the rotary mower over the sharpening device;
- (c) operating the mower at a sufficient speed to raise the sharpening device by vacuum force to sharpen the blade;
- and
- (d) decreasing the speed of the mower to lower the sharpening device.
2 more elements
Dependencies are inferred from the claim text.