Cutting – Tool or tool with support – Pointed perforators
Patent
1994-09-08
1996-07-23
Jones, Eugenia
Cutting
Tool or tool with support
Pointed perforators
83695, 83697, B26F 114
Patent
active
055379052
ABSTRACT:
A perforating rule for perforating paper and plastic including a shank portion having substantially planar side surfaces parallel to a central plane therebetween, a cutting portion having a V-shaped cross-section with the narrower end of the V providing a cutting edge, the cutting portion having portions separated by a plurality of notches extending inwardly from the cutting edge toward the shank portion, and an intermediate portion interconnecting the shank and cutting portions having opposite side surfaces extending from the shank portion to the cutting portion. The thickness of the rule at about 0.024 inch from the cutting edge is about 0.014 inches, the notches have a width in the direction of the length of the rule of about 0.007 inches and a depth of about 0.025 inches, and the portions of the cutting portion have a width in the direction of the length of the rule greater than the width of the notches. The tooth shape and spacing of the perforating rule reduces the stresses placed on the material or stock during cutting, thereby preventing premature rupture of ties along a line of weakness.
REFERENCES:
patent: 2361288 (1944-10-01), Hardy, Jr.
patent: 2401310 (1946-06-01), Mayhew
patent: 2731902 (1955-07-01), Biss
patent: 3411208 (1968-11-01), Malm
patent: 3824887 (1974-07-01), Marchard
patent: 4829854 (1989-05-01), Kammerling-Essmann
patent: 5117721 (1992-06-01), Montrose
patent: 5240755 (1993-08-01), Zimmer
Ulvila Richard M.
Zimmer Gregory
Jones Eugenia
Zimmer Industries, Inc.
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