Cutlery – Cutting tools – Plural cooperating blades
Patent
1989-07-14
1990-11-27
Watts, Douglas D.
Cutlery
Cutting tools
Plural cooperating blades
30263, 30314, 30297, 30301, B26B 1300
Patent
active
049725858
ABSTRACT:
A rotary blade cutter (10) including a semitubular rotary cutting blade (12) rotatably mounted within a tubular housing (14). The tubular housing 14 includes an entrance slit (22) and a diametrically opposed exit slit (24) for insertion of a web into the cutting device. A first cutting edge (32) is formed along a first side of the entrance slit. The semitubular rotary cutting blade includes a first slit (36) nominally aligned with the housing entrance slit when the rotary blade is in a retracted position, and includes a second cutting edge (48) that is formed adjacent a second side (46) of the entrance slit to oppose the first cutting edge. The second cutting edge is tapered to spiral around the longitudinal axis of the housing. The rotary cutting blade includes a spiral groove (50) that coacts with a guide pin (52) projecting inwardly from the housing to constrain the rotary cutting blade to rotate about the longitudinal axis of the housing when the rotary blade is longitudinally advanced within the housing. As the cutting blade rotates, the second cutting edge moves progressively past the first cutting edge to cut the web inserted therebetween.
REFERENCES:
patent: 2894324 (1959-07-01), Hardin
patent: 4649919 (1987-03-01), Thimsen et al.
Fridie Willmon
Watts Douglas D.
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