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US 4,192,467 AGranted
Document shredder
OwnerTakefumi Hatanakainventor
Life of this patent
Estimating the term…
Abstract
A document shredder which comprises a strip cutter to cut waste document into strips, a chip cutter to cut the strips into chips, and a minuting device disposed downstream of the chip cutters to cut the chips into pulp-like mass. The minuting device includes a housing having a conical surface formed with cutting teeth, and a conical rotary body formed with cutting teeth in engagement the cutting teeth of the housing.
Claims3
A document shredder for processing waste documents, comprising:
- means for destroying the waste documents such that the documents are rendered unintelligible;
- drive means for providing driving power to said destroying means;
- a casing housing said destroying means and said drive means;
- a stand-by chamber formed in said casing to temporarily keep the waste documents in a stand-by condition;
- feed means for feeding at least one sheet from the waste documents kept in said stand-by chamber to said destroying means;
- a cover mounted on said casing to close said stand-by chamber;
- means for sensing the presence of the waste documents kept in said stand-by chamber and producing an output signal in response thereto;
- and
- locking means responsive to said output signal for locking said cover to said casing while said waste documents are kept in said stand-by chamber.
6 more elements
A document shredder according to claim 3, in which said drive means is operable in response to said output signal.
Dependencies are inferred from the claim text.