1976-12-29
1978-12-12
Coan, James F.
93 1G, 93 583, B26D 308, B31F 100
Patent
active
041290658
ABSTRACT:
A method of grooving sheet material along a line about which the material is subsequently to be folded comprises the step of forming, along said line, an impression. The impression forms a groove on one side of the material, the groove being intended to form the outer face of the edge of the fold when the material has been folded. The impression also forms, on the other side of the material, a corresponding bead which is intended to be located on the inside of the fold. Two parallel and opposite lines of elongate depressions are formed in the bead during the formation of the impression, the lines of depressions being formed one on each side of the central longitudinal axis of the bead. Each depression is constituted a portion of material which is of reduced thickness and which creates a localized zone of reduced strength.
REFERENCES:
patent: 1187144 (1916-06-01), Hawkins
patent: 1340558 (1920-05-01), Plummer
patent: 2781095 (1957-02-01), Spinner
patent: 2949827 (1960-08-01), Kempen et al.
Coan James F.
Machines Chambon
Nissen J. Harold
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