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Publication numberUS3921920 A
Publication typeGrant
Publication dateNov 25, 1975
Filing dateApr 18, 1974
Priority dateApr 27, 1973
Also published asDE2410065A1, DE2410065B2
Publication numberUS 3921920 A, US 3921920A, US-A-3921920, US3921920 A, US3921920A
InventorsBrocard Huguette
Original AssigneeBrocard Huguette
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Machine for destroying documents
US 3921920 A
Abstract
Machine for destroying documents, of the kind which contains two parallel shafts driving cutting discs or cutting tools engaging one another, characterized in that there is used two pairs of shafts equipped with cutting tools, said pairs of shafts being disposed one above the other, and a means is introduced between them to pivot the shreds cut out by the upper cutting tools in such a way that said shreds will fall in a substantially horizontal direction of the lower cutting tools.
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United States Patent 11 1 Brocard 1 1 Nov. 25, 1975 MACHINE FOR DESTROYING DOCUMENTS l-luguette Brocard, 14, rue de lOdeon, 75006 Paris, France Filed: Apr. 18, 1974 Appl. No.: 461,940

Inventor:

[30] Foreign Application Priority Data Apr 27, 1973 France 73.15282 U.S. Cl 241/159; 241/236 Int. Cl. B02C 13/20 Field of Search 241/101.4, 159, 236;

References Cited UNITED STATES PATENTS 3/1914 Guettler 241/236 X 1,340,225 5/1920 Howard 83/35 X 3.630,46O 12/1971 Goldhammer 241/236 3,713,358 1/1973 Honeycutt et al. 83/35 3,727,850 4/1973 Krigbaum 1. 241/159 Primary ExaminerGranvi1le Y. Custer, Jr. Attorney, Agent, or Firm--Ul1e C. Linton [57] ABSTRACT Machine for destroying documents, of the kind which contains two parallel shafts driving cutting discs or cutting tools engaging one another, characterized in that there is used two pairs of shafts equipped with cutting tools, said pairs of shafts being disposed one above the other, and a means is introduced between them to pivot the shreds cut out by the upper cutting tools in such a way that said shreds will fall in a substantially horizontal direction of the lower cutting tools.

2 Claims, 2 Drawing Figures U.S. Patent v Nov. 25, 1975 Sheet 1 Of2 3,921,920

. I 4 a x F U.S. Patent Nov.25", 1975 Sheet2of2 3,921,920

MACHINE FOR DESTROYING DOCUMENTS The present invention relates to a machine for destroying documents, of the type which permits cutting documents into shreds.

Such machines are generally constituted by two series of cutting discs, or cutting tools, mounted on a shaft driven by a mechanical means with the discs in one series engaging between the discs of the other series, and each disc rotating between guides integral with the frame of the machine.

In order that the document, which is to be cut into shreds, may not be reconstituted, it is necessary that said shreds be very narrow, and this makes it necessary to use very thin cutting tools, which are therefore very fragile, and not very efficient.

The present invention relates to a machine which, aside from the fact that it can have high efficiency, guarantees the total destruction of the document, and it is remarkable in that it contains two shafts provided with cutting tools, and below then, a second, indentical device, and a means being provided between these two devices so that the shreds produced by the upper device will pivot by substantially 90 in such a way as to be placed horizontally, before falling onto the cutting tools on the lower device.

In this way there is obtained, at the outlet from the machine, very irregular and completely unreadable particles.

The invention will be better understood, on reading the description which follows, made in reference to the attached drawings by way of indicative example only, in which:

FIG. 1 is a diagrammatic sectional view of the machine, made through a vertical plane perpendicular to the plane of the cutters, and,

FIG. 2 is a diagrammatic partial side view of FIG. 1.

Referring to the drawing, the machine is composed of two parallel means, and on which are keyed cutting tools 3 and 4 with cutters 3 engaging between cutters 4.

In a known fashion, crossbraces 5, held by rods 6, are inserted between the cutters.

The above device as a whole constitutes an ordinary machine for cutting documents into shreds or strips.

According to the present invention, this first device is disposed in a frame, shown at 7, above a similar device containing two shafts 8 and 9. cutters 10-11, and crossbraces 12 held by rods 13.

Shafts l, 2, 8 and 9 rotate according to arrows F and F2.

Between these two devices there is inserted a means which permits bedding the shreds produced by the upper device. in such a way that they will be disposed substantially horizontally when they fall onto cutters 10 and 11.

In this way, the shreds are cut again and reduced to the state of completely illegible particles.

The said means can be constituted by a rotary spiral screw 14. It should be noted that the axis of the screw is offset with respect to the vertical plane of symmetry X-Y of the apparatus.

Assuming that screw 14 is turning according to arrow F (FIG. 2), it can be seen that when thread S meets the lower end of a strap L, which falls according to arrow F the latter is displaced according to arrow F and will occupy the position L shown in broken lines. When the strap L escapes from cutters 3-4, nothing prevents it from rocking and it will now occupy, as it falls, position L that is to say, one according to which the strap will extend parallel to the axes of cutters In addition, in order to prevent wadding, the speed of rotation of screw 14 is higher than that of shafts 1 and 2, and the speed of rotation of shafts 8 and 9 is higher than that of said screw.

Since the documents are cut twice, it is not necessary that the shreds be very thin, and therefore we can use relatively thick, hence strong, cutting tools, and obtain high efficiency.

I claim:

1. Machine for destroying documents comprising, in combination, a first device constituted by two driven shafts to be driven in rotation in opposite directions to one another, cutters being mounted on said shafts, the cutters on one of said shafts interlocking between the cutters on the other of said shafts, a second device similar to and disposed below said first device, and a rotary driven spiral screw disposed between said two devices with the axis of said screw being parallel to those of said shafts of said two devices.

2. Machine for destroying documents according to claim 1, in which the axis of said screw is offset with respect to the vertical plane of the machine.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1090914 *Mar 6, 1912Mar 24, 1914Fritz GueettlerPaper-comminuting machine.
US1340225 *Aug 20, 1919May 18, 1920United Shoe Machinery CorpMethod of cutting sheet material
US3630460 *Oct 20, 1969Dec 28, 1971Goldhammer AlbertPaper shredder
US3713358 *Jun 30, 1971Jan 30, 1973Celanese CorpApparatus and process for severing flexible sheet materials
US3727850 *Apr 16, 1971Apr 17, 1973C KrigbaumScrap rubber shredding device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4068805 *Nov 5, 1976Jan 17, 1978Fred OswaldShredding machine
US4124169 *Jun 13, 1977Nov 7, 1978Takefumi HatanakaDocument shredder
US4192467 *Aug 16, 1978Mar 11, 1980Takefumi HatanakaDocument shredder
US4200239 *Jul 14, 1978Apr 29, 1980Wright Line Inc.Machine that quadrates documents
US4230282 *Jun 28, 1978Oct 28, 1980Moco Maschinen- Und Apparatebau Gmbh & Co. KgComminuting plant
US4729515 *Feb 28, 1986Mar 8, 1988Wagner John WMachine for cutting disposable containers
US5071080 *Feb 27, 1990Dec 10, 1991Fellowes Manufacturing CompanyDocument shredding machine
US5295633 *Jan 13, 1992Mar 22, 1994Fellowes Manufacturing CompanyDocument shredding machine with stripper and cutting mechanism therefore
US5636801 *Aug 2, 1995Jun 10, 1997Fellowes Mfg. Co.One piece molded stripper for shredders
US5655725 *Aug 24, 1995Aug 12, 1997Fellowes Manufacturing Co.Retaining plate for gearing
US5676321 *Apr 3, 1995Oct 14, 1997Fellowes Mfg. Co.Cutting disk
US5829697 *Jul 8, 1997Nov 3, 1998Fellowes Manufacturing CompanySupport for cylinders in a paper shredder
US5954280 *May 12, 1998Sep 21, 1999Fellowes Manufacturing CompanyTop blocker for a paper shredder
US8770503 *Jan 24, 2011Jul 8, 2014Shred-It International UlcStaged paper shredder
US20120006920 *Jan 24, 2011Jan 12, 2012Shred-It International Inc.Staged paper shredder
DE2941149A1 *Oct 10, 1979Apr 17, 1980Takefumi HatanakaAktenwolf
EP1285697A1 *Aug 20, 2002Feb 26, 2003Schleicher & Co. of America, Inc.Document shredder for cutting flat material
EP1334771A1 *Feb 6, 2003Aug 13, 2003Hermann SchwellingDocument shredder
EP2316574A2 *Oct 26, 2010May 4, 2011Hermann SchwellingMethod for reducing the readability of data stored on hard drives and device for crushing hard drives
WO2003066222A1 *Feb 6, 2003Aug 14, 2003Hermann SchwellingFine cutting cutting machine for a shredder
Classifications
U.S. Classification241/159, 241/236
International ClassificationB02C18/06, B26D1/01, B02C18/00, B26D1/24
Cooperative ClassificationB02C18/0007, B02C2018/0069
European ClassificationB02C18/00B