Metal working – Filing
Patent
1974-11-18
1976-04-20
Vlachos, Leonidas
Metal working
Filing
B23D 7104
Patent
active
039508323
ABSTRACT:
An elongate multi-sided file in which the file defining serrated surfaces extend substantially the length thereof, with the surfaces intersecting to define a number of longitudinally extending edges. The longitudinal edges have a number of spaced teeth formed thereon. When a saw requires sharpening it is due to the edges of the teeth having become dull and of round configuration. The angular relationship between two adjoining file surfaces on the invention is that which existed in the V-shaped space between adjacent edges of teeth on a saw when the edges were in a sharpened condition. When the file is reciprocated in one of such spaces on a dull file, the teeth on one of the longitudinal edges of the file cut into the inner apex defined at the junction of the edges of two adjacently disposed teeth, as material is concurrently removed from these edges by abrating contact with two of the serrated surfaces. The above described operation is performed sequentially on all of the teeth of a saw to provide the teeth of the saw with sharp cutting edges. The use of the file of the structure above described has been found from experience to increase the number of saws that may be sharpened by four to five per hour.
REFERENCES:
patent: 114824 (1871-05-01), Hyland
patent: 138256 (1873-04-01), Johnson
patent: 1066340 (1913-07-01), Thomas
patent: 1379779 (1921-05-01), Pritz
patent: 1751034 (1930-03-01), Erb
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