Metal working – Filing
Patent
1975-12-17
1976-11-09
Vlachos, Leonidas
Metal working
Filing
29 80, 76101SM, B23D 7104
Patent
active
039901343
ABSTRACT:
This invention relates to sheet metal files of the type having a large number of discrete cutting edges projecting from the surface of an elongated strip of thin sheet metal forming the base of the file. In such a file, the depth of the cut by each individual cutting edge is very small and accordingly, the pressure on each cutting edge is small and the base of the file need only have sufficient strength and rigidity to support the edge and apply the necessary small cutting pressure. The cutting edges are formed by partially shearing tabs or teeth from the solid strip forming the base and bending them out of the plane of the base at an acute angle. The ends of the teeth are sharpened and hardened to form the discrete cutting edges having the desired rake and clearance angle. The tabs or teeth are generally disposed in parallel rows which extend laterally and non-perpendicularly with respect to the longitudinal axis of the file with the cutting edges in adjacent rows being laterally offset with respect to each other.
REFERENCES:
patent: 643717 (1900-02-01), Ingalsbe
patent: 1831590 (1931-11-01), Ferguson
patent: 3531841 (1970-10-01), McCord
patent: 3583107 (1971-06-01), Benis et al.
patent: 3815190 (1974-06-01), Russell et al.
The Stanley Works
Vlachos Leonidas
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