Removable knives for punching cardboard slots

Details Removable knives for punching cardboard slots Removable knives for punching cardboard slots

1988-03-25

1989-04-11

Schran, Donald R.

Cutting

Tool or tool with support

Rotatable type

83668, 493376, B31B 122, B26D 314

Patent

active

048195340

ABSTRACT:
A knife assembly for punching slots on cardboard sheets to allow the subsequent forming of boxes and containers. The knife assembly is substantially a flat arc section with an outer and an inner edge. The outer edge is substantially flat to permit sharp punched edges of the slot. The arc section has two ends and adjacent to one of the ends there is a sharpened section intended to produce a slit termination on the slots punched. The slit can have any desired dimensions including the entire outer edge.

REFERENCES:
patent: Re19059 (1934-01-01), Schillo
patent: 725863 (1903-04-01), McMillin
patent: 1027822 (1912-05-01), Daven
patent: 1263987 (1918-04-01), Wyman
patent: 1493404 (1924-05-01), Schroeder
patent: 3036486 (1962-05-01), Wilcox
patent: 4073207 (1978-02-01), Kirkpatrick

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