Cutlery – Cutting tools – Plural cooperating blades
Patent
1975-06-27
1977-02-08
Yost, Frank T.
Cutlery
Cutting tools
Plural cooperating blades
83639, 83917, B23D 2700
Patent
active
040065278
ABSTRACT:
Large metallic structures such as vessels, railroad cars or the like are salvaged by disintegrating the structures into small, readily handled pieces of scrap metal for shipment of the pieces to a steel mill or the like. A portable shear is provided which comprises a tubular female shear member having a first arcuate cutting edge and a cylindrical male shear element which defines a second, cooperating cutting edge and which reciprocates within the tubular member. With the cutting edges in their spaced-apart positions the shear is placed over an edge of the structure and power means is actuated to move the cutting edges against each other and to thereby sever a relatively small piece of scrap metal from the structure. Thereafter, the cutting edges are retracted, the shear is relocated to another, e.g. adjacent portion of the structure and another piece of scrap metal is severed. The cutting edges are angularly inclined with respect to each other so that each piece is sequentially severed from the structure to thereby reduce the force that must be exerted to effect the shearing operation. Means is further provided to limit the maximum size of the severed piece to less than an interior opening of the tubular member so that the severed piece is readily removed therefrom without the exertion of a mechanical removal force.
REFERENCES:
patent: 2217393 (1940-10-01), Webb
patent: 2542103 (1951-02-01), Adel
patent: 3025600 (1962-03-01), Leibinger
patent: 3235963 (1966-02-01), Hall
patent: 3446105 (1969-05-01), Herzog
patent: 3465633 (1969-09-01), Reynolds et al.
patent: 3622067 (1971-11-01), Bucy et al.
patent: 3861037 (1975-01-01), Smith et al.
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