US3860180A - Method and apparatus for destroying documents - Google Patents

Method and apparatus for destroying documents Download PDF

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Publication number
US3860180A
US3860180A US341294A US34129473A US3860180A US 3860180 A US3860180 A US 3860180A US 341294 A US341294 A US 341294A US 34129473 A US34129473 A US 34129473A US 3860180 A US3860180 A US 3860180A
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United States
Prior art keywords
document
roller
cutter
notch
rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US341294A
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English (en)
Inventor
Albert Goldhammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schleicher and Co International AG
Original Assignee
Albert Goldhammer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19722247901 external-priority patent/DE2247901C3/de
Application filed by Albert Goldhammer filed Critical Albert Goldhammer
Application granted granted Critical
Publication of US3860180A publication Critical patent/US3860180A/en
Assigned to SCHLEICHER & CO. INTERNATIONAL AG, A CORP. OF FEDERAL REPUBLIC OF GERMANY reassignment SCHLEICHER & CO. INTERNATIONAL AG, A CORP. OF FEDERAL REPUBLIC OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GOLDHAMMER, ALBERT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents

Definitions

  • the present invention proposes a method of destroying documents in which the documents are not only cut into narrow strips, but the strips are also cut or torn transversely into shorter pieces.
  • a further object is the provision of an apparatus for destroying documents in which the documents are cut into strips while simultaneously the strips themselves are subdivided into shorter sections.
  • a document destroying, or shredding device in which two counter rotating rollers are provided, each having cutting discs interleaved with the cutting discs of the other roller so that a document fed between the rollers will be cut into long narrow strips.
  • the individual H discs have interruptions on the peripheries thereof and the trailing edge of each interruption is arranged to cut or tear off a strip of the document so as to form the strips into short sections.
  • the cutting or tearing of the strips into shorter'sections takes place simultaneously with the slitting of the document into long strips.
  • FIG. 1 is a somewhat schematic fragmentary plan view showing a document destroying device according to the present invention.
  • FIG. 2 is a sectional view indicated by line II-Il on FIG. 1.
  • FIG. 3 shows a portion of a document which has been partially destroyed in the apparatus.
  • FIGS. 4 and 5 are fragmentary views drawn at enlarged scale and showing the manner in which the device operates.
  • the document destroying device comprises a pair of rollers 3 and 4 rotatable on respective axes 1 and 2 and which axes are parallel.
  • the rollers are geared together so as to counter rotate and are rotatably supported in a frame 5 as by antifriction bearings with the bearings of one roller being axially displaced from the bearings of the other roller so that bearings of substantial size can be employed while at the same time the rollers can be arranged in the proper spaced relation.
  • Each roller is provided with cutting discs 6 which have cylindrical peripheries and substantial radial edges so as to form sharp corners at the axial ends of the respective discs.
  • the discs 6 are in spaced relation on the respective rollers and interleave with one another so that each pair of adjacent axial edges of the discs form a slitter. A document fed between the rollers will, thus, be cut into relatively thin longitudinal strips by the cutters.
  • Each cutter roller may be manufactured from tubular material by suitable machining processes or the central portion of each roller may be tubular with the discs mounted thereon in fixedly spaced relation.
  • each disc is provided about its periphery with notches 7 with each notch having a trailing side 7 which intersects the periphery of the respective disc at an angle of from about to about The angle of intersection of the trailing side of each notch with the circumference of the respective disc forms a transverse cutting edge for forming a lateral incision in the document being shredded.
  • a nose angle of greater than 90 would give such a blunt cutting edge that the document would not be cut and a nose angle sharper than 75 has been found to be so sharp as to be easily damaged by paper fasteners or clips or the like that might pass through the machine with the document.
  • the notches are formed in the discs by taking helical cuts around the assembled cutting roller to form a helical notch thereabout.
  • the angle of inclination of the trailing side of the notches is easily obtained by. imparting the proper angle to the cutter forming the groove and by forming the grooves helically about the rollers.
  • the notches are staggered relative to each other and, thus, progressively cut the document as it passes between the rollers. By so staggering the notches the driving energy required to drive the rollers remains substantially constant and thereby a smaller.
  • FIG. 3 shows a portion of a document which is partially shredded.
  • the longitudinal slits being formed in the document are indicated at 12 while the transverse cuts in the document are indicated at 14.
  • Slits 12 are made by the edges of the cutter discs whereas transverse incisions 14 are formed by the noses at the trailing sides of the notches 7'.
  • FIGS. 4 and 5 show a document D passing downwardly between rollers 3 and 4.
  • the document has the lower end thereof cut into strips while in the region 10 of the document immediately below the cutting edge on nose 7 the document is not slit.
  • the document how ever, is bent over nose 17 at the advancing side of notch 7' and is, thus, held taut so that nose 7 will make an incision in the document when the nose passes on between the discs on roller 4.
  • the cutter discs may be provided with recesses 20 in advance of the notches therein which engage the respective paper strip and draw it tight against nose 7.
  • Recesses 20 may be engaged by members on the other roller, but even if nothing else engages in recess 20 the paper strip will still be clamped therein as illustrated in FIG. 4 thereby to draw the respective strip into a state of tension over nose 7.
  • the fragment of the document D shown in FIG. 3 has a longitudinal strip identified at A which corresponds substantially to the condition of the document with rollers 3 and 4 in the FIG. 4 position, that is, with notch 7' having the nose portion 7 just about to enter between the pertaining discs on roller 4.
  • the strip being cut will correspond to that indicated at B in FIG. 3.
  • the present invention provides for the reduction of a document into narrow longitudinal strips while simultaneously interrupting each longitudinal strip to form it into short sections.
  • the method of reducing documents according to the present invention has the further advantage that the shredded documents can rapidly be reduced in a further process by the use of putrefication bacteria and the thus reduced document material can be utilized as humus.
  • the shredding of the documents according to the present invention preserves a high degree of secrecy because the short sections into which the strips are formed will be thoroughly mixed up and the documents cannot be reassembled.
  • the usual process for insuring maximum secrecy is to cut the documents into extremely narrow strips, down to as little as one millimeter wide, but according to the present invention, the document particles may be as wide as 4 millimeters with each section of each strip being on the order of to millimeters in length.
  • the method of destroying a document which comprises: cutting the document into narrow longitudinal strips while simultaneously forming each strip into short sections, the longitudinal strips being formed by making spaced parallel slits in the document, and the longitudinal strips being formed into short sections by making transverse incisions in the document each of which extends obliquely from the path of one slit to the path of an adjacent slit, the incisions pertaining to each strip being formed in the document in longitudinally distributed relation with each incision staggered relative to laterally adjacent incisions, the transverse incisions being formed in the document in advance of the forming of the slits intersected thereby and simultaneously with the forming of the slits.
  • each roller comprising axially spaced cutter discs having radial side faces and a cylindrical periphery with axial edges and with the cutter discs of each roller fitting closely between the cutter discs of the other roller whereby each adjacent pair of cutter disc edges forms a slitter, and means on the circumference of each cutter disc comprising the trailing edge of at least one axial notch formed in the periphery of the cutter discs pertaining to at least one roller for forming transverse interruptions in strips of the document formed by adjacent slittcrs, each said notch being inclined from side to side and being displaced circumferentially from the notch in adjacent cutter discs in such a manner that the notch pertaining to the cutter discs of each roller define at least one helical groove in the periphery of the respective roller, the side of each notch which is trailing when the respective roller is rotating forming an included angle with the periphery of the respective cutter disc where the side intersects the
  • a document shredder according to claim 2 which includes frame means, and bearings supporting the rollers in the frame means, adjacent ones of said bearings being disposed in axially displaced relation.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Nonmetal Cutting Devices (AREA)
US341294A 1972-09-29 1973-03-14 Method and apparatus for destroying documents Expired - Lifetime US3860180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722247901 DE2247901C3 (de) 1972-09-29 Vorrichtung zum Zerkleinern von Papierbogen

Publications (1)

Publication Number Publication Date
US3860180A true US3860180A (en) 1975-01-14

Family

ID=5857792

Family Applications (1)

Application Number Title Priority Date Filing Date
US341294A Expired - Lifetime US3860180A (en) 1972-09-29 1973-03-14 Method and apparatus for destroying documents

Country Status (4)

Country Link
US (1) US3860180A (ja)
JP (2) JPS4971576A (ja)
FR (1) FR2201134B1 (ja)
GB (1) GB1389993A (ja)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034918A (en) * 1975-08-06 1977-07-12 Saturn Manufacturing, Inc. Drive arrangement for rotary shredding apparatus
DE2941149A1 (de) * 1978-10-11 1980-04-17 Takefumi Hatanaka Aktenwolf
US4200239A (en) * 1978-07-14 1980-04-29 Wright Line Inc. Machine that quadrates documents
US4411391A (en) * 1980-05-27 1983-10-25 Ofrex Group Limited Document shredding machines
US4452400A (en) * 1981-11-23 1984-06-05 Williams Patent Crusher And Pulverizer Company Rotary shredding apparatus
US4538766A (en) * 1983-06-03 1985-09-03 Constructie Werkhuizen Vandekerckhove N.V. Process and apparatus for crushing raw materials
US4564146A (en) * 1982-08-27 1986-01-14 Ofshred Limited Paper shredding machine
EP0187445A2 (en) * 1984-11-01 1986-07-16 Cummins-Allison Corporation A particle type shredding mechanism
US4625925A (en) * 1983-04-12 1986-12-02 Feinwerktechnik Schleicher & Co. Comminuting apparatus for sheet material or sheet material layers
US4627582A (en) * 1981-03-30 1986-12-09 Firma Feinwerktechnik Schliecher & Co. Apparatus for comminution of waste material such as paper blocks
US4754933A (en) * 1984-12-07 1988-07-05 Gao Gesellschaft Fur Automation Und Organisation Mbh Apparatus for destroying documents such as banknotes
DE8705031U1 (ja) * 1987-04-04 1988-08-04 Schwelling, Hermann, 7777 Salem, De
US4830295A (en) * 1986-07-29 1989-05-16 Hermann Schwelling Knife roller for paper shredder
GB2169222B (en) * 1984-12-21 1989-08-16 Ofrex Group Holdings Plc Improvements relating to shredding machines
US4944462A (en) * 1989-05-02 1990-07-31 Cummins-Allison Corp. Shredder
US5071080A (en) * 1990-02-27 1991-12-10 Fellowes Manufacturing Company Document shredding machine
US5163629A (en) * 1991-05-01 1992-11-17 Cummins-Allison Corp. Shredder cutting discs
US5275342A (en) * 1991-08-30 1994-01-04 Galanty William B Solid waste crusher and sizing apparatus
US5295633A (en) * 1992-01-13 1994-03-22 Fellowes Manufacturing Company Document shredding machine with stripper and cutting mechanism therefore
US5533684A (en) * 1994-10-17 1996-07-09 Beloit Technologies, Inc. Wood chip strand splitter
US5560552A (en) * 1993-11-12 1996-10-01 Environmental Products Corporation Container cutting assembly
US5636801A (en) * 1995-08-02 1997-06-10 Fellowes Mfg. Co. One piece molded stripper for shredders
US5655725A (en) * 1995-08-24 1997-08-12 Fellowes Manufacturing Co. Retaining plate for gearing
US5676321A (en) * 1995-04-03 1997-10-14 Fellowes Mfg. Co. Cutting disk
US5829697A (en) * 1995-08-24 1998-11-03 Fellowes Manufacturing Company Support for cylinders in a paper shredder
WO2005021458A1 (en) * 2003-08-29 2005-03-10 Bki Holding Corporation System for delivery of fibers into concrete
US20080053994A1 (en) * 2006-08-30 2008-03-06 Aurora Office Equipment Co., Ltd. Shanghai Paper-Breaker Wastebin Structure
US7344096B2 (en) 2004-04-02 2008-03-18 Fellowes Inc. Shredder with lock for on/off switch
US20100270404A1 (en) * 2009-04-28 2010-10-28 Aurora Office Equipment Co., Ltd. Shanghai type protection device for shredders
US20100282879A1 (en) * 2009-05-07 2010-11-11 Aurora Office Equipment Co., Ltd.Shanghai Anti-paper jam protection device for shredders
US8008812B2 (en) 2006-07-14 2011-08-30 Aurora Office Equipment Co., Ltd. Paper shredder control system responsive to touch-sensitive element
US8018099B2 (en) 2006-07-14 2011-09-13 Aurora Office Equipment Co., Ltd. Touch-sensitive paper shredder control system
US8146845B2 (en) 2008-08-06 2012-04-03 Aurora Office Equipment Co., Ltd. Shanghai Automatic shredder without choosing the number of paper to be shredded
US8201766B2 (en) 2008-08-19 2012-06-19 Aurora Office Equipment Co., Ltd. Pins or staples removable structure of automatic shredders
US8708260B2 (en) 2011-08-08 2014-04-29 Aurora Office Equipment Co., Ltd. Depowered standby paper shredder and method
US8723468B2 (en) 2011-04-28 2014-05-13 Aurora Office Equipment Co., Ltd. Cooled motor
CN106079002A (zh) * 2016-08-18 2016-11-09 安徽省双龙木质纤维素有限公司 一种制作木质纤维的棉花茎杆打碎装置
CN106192503A (zh) * 2016-08-18 2016-12-07 安徽省双龙木质纤维素有限公司 一种制作木质纤维的书本打碎装置
CN107838180A (zh) * 2017-12-20 2018-03-27 中国大冢制药有限公司 软袋制品销毁装置
EP3441635A1 (de) * 2017-08-09 2019-02-13 Hermann Schwelling Lageranordnung sowie damit ausgestattete bearbeitungs-vorrichtung
US11181145B2 (en) 2017-08-09 2021-11-23 Hermann Schwelling Bearing arrangement and thus equipped processing device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5278875U (ja) * 1975-12-11 1977-06-13
JPS5288787U (ja) * 1975-12-26 1977-07-02
JPS53100187U (ja) * 1977-01-19 1978-08-14

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1090914A (en) * 1912-03-06 1914-03-24 Fritz Gueettler Paper-comminuting machine.
US3529782A (en) * 1967-02-13 1970-09-22 Arno J Liebman Disintegrating machine
US3630460A (en) * 1968-11-09 1971-12-28 Albert Goldhammer Paper shredder
US3664592A (en) * 1968-09-03 1972-05-23 Luitpold Schweigert Machine for granulating bulk rubbish or bulky refuse of any kind

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1090914A (en) * 1912-03-06 1914-03-24 Fritz Gueettler Paper-comminuting machine.
US3529782A (en) * 1967-02-13 1970-09-22 Arno J Liebman Disintegrating machine
US3664592A (en) * 1968-09-03 1972-05-23 Luitpold Schweigert Machine for granulating bulk rubbish or bulky refuse of any kind
US3630460A (en) * 1968-11-09 1971-12-28 Albert Goldhammer Paper shredder

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034918A (en) * 1975-08-06 1977-07-12 Saturn Manufacturing, Inc. Drive arrangement for rotary shredding apparatus
US4200239A (en) * 1978-07-14 1980-04-29 Wright Line Inc. Machine that quadrates documents
DE2941149A1 (de) * 1978-10-11 1980-04-17 Takefumi Hatanaka Aktenwolf
US4411391A (en) * 1980-05-27 1983-10-25 Ofrex Group Limited Document shredding machines
US4627582A (en) * 1981-03-30 1986-12-09 Firma Feinwerktechnik Schliecher & Co. Apparatus for comminution of waste material such as paper blocks
US4452400A (en) * 1981-11-23 1984-06-05 Williams Patent Crusher And Pulverizer Company Rotary shredding apparatus
US4564146A (en) * 1982-08-27 1986-01-14 Ofshred Limited Paper shredding machine
US4625925A (en) * 1983-04-12 1986-12-02 Feinwerktechnik Schleicher & Co. Comminuting apparatus for sheet material or sheet material layers
US4538766A (en) * 1983-06-03 1985-09-03 Constructie Werkhuizen Vandekerckhove N.V. Process and apparatus for crushing raw materials
EP0187445A2 (en) * 1984-11-01 1986-07-16 Cummins-Allison Corporation A particle type shredding mechanism
EP0187445A3 (en) * 1984-11-01 1987-05-20 Cummins-Allison Corporation A particle type shredding mechanism
US4693428A (en) * 1984-11-01 1987-09-15 Cummins Allison Corporation Particle-type shredding mechanism
US4754933A (en) * 1984-12-07 1988-07-05 Gao Gesellschaft Fur Automation Und Organisation Mbh Apparatus for destroying documents such as banknotes
US4878626A (en) * 1984-12-07 1989-11-07 Gao Gesellschaft Fur Automation Und Organisation Mbh Apparatus for destroying banknotes
GB2169222B (en) * 1984-12-21 1989-08-16 Ofrex Group Holdings Plc Improvements relating to shredding machines
US4830295A (en) * 1986-07-29 1989-05-16 Hermann Schwelling Knife roller for paper shredder
DE8705031U1 (ja) * 1987-04-04 1988-08-04 Schwelling, Hermann, 7777 Salem, De
US4944462A (en) * 1989-05-02 1990-07-31 Cummins-Allison Corp. Shredder
AU621445B2 (en) * 1989-05-02 1992-03-12 Cummins-Allison Corp. Shredder
US5071080A (en) * 1990-02-27 1991-12-10 Fellowes Manufacturing Company Document shredding machine
US5163629A (en) * 1991-05-01 1992-11-17 Cummins-Allison Corp. Shredder cutting discs
US5275342A (en) * 1991-08-30 1994-01-04 Galanty William B Solid waste crusher and sizing apparatus
US5295633A (en) * 1992-01-13 1994-03-22 Fellowes Manufacturing Company Document shredding machine with stripper and cutting mechanism therefore
US5560552A (en) * 1993-11-12 1996-10-01 Environmental Products Corporation Container cutting assembly
US5533684A (en) * 1994-10-17 1996-07-09 Beloit Technologies, Inc. Wood chip strand splitter
US5676321A (en) * 1995-04-03 1997-10-14 Fellowes Mfg. Co. Cutting disk
US5636801A (en) * 1995-08-02 1997-06-10 Fellowes Mfg. Co. One piece molded stripper for shredders
US5655725A (en) * 1995-08-24 1997-08-12 Fellowes Manufacturing Co. Retaining plate for gearing
US5829697A (en) * 1995-08-24 1998-11-03 Fellowes Manufacturing Company Support for cylinders in a paper shredder
WO2005021458A1 (en) * 2003-08-29 2005-03-10 Bki Holding Corporation System for delivery of fibers into concrete
US20070190300A1 (en) * 2003-08-29 2007-08-16 Bell Robert I System for delivery of fibers into concrete
CN100410199C (zh) * 2003-08-29 2008-08-13 Bki控股公司 向混凝土中供应纤维的系统
US7790278B2 (en) 2003-08-29 2010-09-07 Buckeye Technologies Inc. System for delivery of fibers into concrete
US7344096B2 (en) 2004-04-02 2008-03-18 Fellowes Inc. Shredder with lock for on/off switch
US8008812B2 (en) 2006-07-14 2011-08-30 Aurora Office Equipment Co., Ltd. Paper shredder control system responsive to touch-sensitive element
US8963379B2 (en) 2006-07-14 2015-02-24 Aurora Office Equipment Co., Ltd. Shanghai Paper shredder control system responsive to touch-sensitive element
US8018099B2 (en) 2006-07-14 2011-09-13 Aurora Office Equipment Co., Ltd. Touch-sensitive paper shredder control system
US20080053994A1 (en) * 2006-08-30 2008-03-06 Aurora Office Equipment Co., Ltd. Shanghai Paper-Breaker Wastebin Structure
US8146845B2 (en) 2008-08-06 2012-04-03 Aurora Office Equipment Co., Ltd. Shanghai Automatic shredder without choosing the number of paper to be shredded
US8201766B2 (en) 2008-08-19 2012-06-19 Aurora Office Equipment Co., Ltd. Pins or staples removable structure of automatic shredders
US20100270404A1 (en) * 2009-04-28 2010-10-28 Aurora Office Equipment Co., Ltd. Shanghai type protection device for shredders
US8087599B2 (en) 2009-05-07 2012-01-03 Aurora Office Equipment Co., Ltd. Anti-paper jam protection device for shredders
US20100282879A1 (en) * 2009-05-07 2010-11-11 Aurora Office Equipment Co., Ltd.Shanghai Anti-paper jam protection device for shredders
US8723468B2 (en) 2011-04-28 2014-05-13 Aurora Office Equipment Co., Ltd. Cooled motor
US8708260B2 (en) 2011-08-08 2014-04-29 Aurora Office Equipment Co., Ltd. Depowered standby paper shredder and method
CN106079002A (zh) * 2016-08-18 2016-11-09 安徽省双龙木质纤维素有限公司 一种制作木质纤维的棉花茎杆打碎装置
CN106192503A (zh) * 2016-08-18 2016-12-07 安徽省双龙木质纤维素有限公司 一种制作木质纤维的书本打碎装置
CN106079002B (zh) * 2016-08-18 2018-05-15 安徽省双龙木质纤维素有限公司 一种制作木质纤维的棉花茎杆打碎装置
EP3441635A1 (de) * 2017-08-09 2019-02-13 Hermann Schwelling Lageranordnung sowie damit ausgestattete bearbeitungs-vorrichtung
US11181145B2 (en) 2017-08-09 2021-11-23 Hermann Schwelling Bearing arrangement and thus equipped processing device
CN107838180A (zh) * 2017-12-20 2018-03-27 中国大冢制药有限公司 软袋制品销毁装置

Also Published As

Publication number Publication date
JPS5415031Y2 (ja) 1979-06-19
DE2247901B2 (de) 1976-08-12
JPS4971576A (ja) 1974-07-10
FR2201134B1 (ja) 1977-07-29
FR2201134A1 (ja) 1974-04-26
GB1389993A (en) 1975-04-09
JPS53135684U (ja) 1978-10-26
DE2247901A1 (de) 1974-04-11

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SCHLEICHER & CO. INTERNATIONAL AG, A CORP. OF FEDE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GOLDHAMMER, ALBERT;REEL/FRAME:005357/0413

Effective date: 19900412