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Publication numberUS3724766 A
Publication typeGrant
Publication dateApr 3, 1973
Filing dateMay 14, 1971
Priority dateMay 14, 1971
Publication numberUS 3724766 A, US 3724766A, US-A-3724766, US3724766 A, US3724766A
InventorsBosland J
Original AssigneeKetcham & Mcdougall
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shredder
US 3724766 A
Abstract
A paper shredder comprises a housing containing rotatable shredder blades, a driving motor and suitable reduction gears. A cover member containing a paper chute is hingedly supported on the housing. The cover member includes a retaining portion at one end which is adapted to fit on the top of a wastepaper basket. At the other end of the cover member a second retaining portion is secured to slide rails which are adjustable relative to the cover. By moving the retainer member, the relative distance between the two retaining portions can be adjusted to accommodate different-sized wastepaper baskets. A suitable limit switch operated by a sensing wire is secured within the cover member to actuate the motor which controls the shredder blades.
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United States Patent [191 [11] 3,724,766 Bosland [451 Apr. 3, 1973 54 SHREDDER Primary Examiner-Granville Y. Custer Jr. l [75] Inventor James M Bus and, Wayne, N J Atmmey Darby & Darby [73] Assignee: Ketcham 8r .McDougall, lnc., Roseland, NJ. [57 ABSTRACT [22] Filed: May 14, 1971 A paper shredder comprises a housing containing [21] AppL No; 143,651 rotatable shredder blades, a driving motor and suitable reduction gears. A cover member containing a paper chute is hingedly supported on the housing. The cover [52] US. Cl ..241/l00, 241/36 member includes a retaining portion at one end which [51] Int. CL...- ..B02c 19/12 is adapted to fit on the top of a wastepaper basket, At Field of Search the other end of the cover member a second retaining 100 portion is secured to slide rails which are adjustable;

relative to the cover. By moving the retainer member, [56] References Cited the relative distance between the two retaining portions can be adjusted to accommodate different-sized UNITED STATES PATENTS wastepaper baskets. A suitable limit switch operated 929,960 8/1909 Low 241/100 x by a s sing wire is secured within the cover member 2,101,700 12/1937 Chesnut, Jr.. ..241/100 X to actuate the motor which controls the shredder 3,396,914 8/1968 Liebman ..24l/236 x blades. 3,620,461 11/1971 Pel1eschi;. ..........24l/l00 3,623,672 11/1971 DeFrank ..241/99 4 Claims, 3 Drawing Figures PATENTEmPRs I975 SHEET 1 BF 2 ATTORNEYS PATENTEUAFRS 197a 3.72dff66 sum 2 OF 2 WIIIIIIIIIII; L 1

INVENTOR. JAMES M. BOSLAND ATTORNEYS SHREDDER The present invention relates to paper shredder devices of the type which may be'used in ordinary business establishments for the purpose of destroying documents.

In many, if not most, businesses a substantial amount of discarded documents contains data or information which, if disclosed, could be harmful to the best interests of the company. Despite this, it is common practice for most companies to discard such documents in their original state. Only in extreme cases are important documents destroyed prior to discarding either by burning or by means of paper shredders.

Generally, commercially available paper shredders are relatively expensive devices which are cumbersome and not readily adaptable to the usual business environment, and there exists a need for a relatively inexpensive device which will reliably perform this function. The present invention provides apaper shredder which fulfills this demand. It is safe to operate, easy to clean and capable of providing trouble-free operation for a long time. Operation of the device is automatically controlled by insertion of a document into a paper chute with appropriate interlocking circuits preventing inadvertent operation of the blades. Additionally, the device may be readily supported upon a variety of wastepaper baskets or the like which vary substantially in size and shape.

Briefly, in accordance with the invention, the rotatable shredder blades along withthe driving motor and suitable reduction gears are mounted within a housing' to which a cover is pivotally secured. The cover contains at one end a fixed retention member adapted to rest on the top of a wastepaper basket. At the other end of the cover a second retention member is mounted on rails which are slidable within tracks in the cover. By appropriate positioning of the second retention member the distance between the two retention members can be adjusted to accommodate wastepaper baskets of different widths.

The invention is described in further detail below with reference to the attached drawings, wherein:

FIG. 1 is a top plan view partially broken away of a shredder according to the invention;

FIG. 2 is a side sectional view of the apparatus shown in FIG. 1; and

FIG. 3 is a sectional view along the line 3-3 of FIG. 1.

Referring to the drawings, a housing for the device is shown at 10. A cover 12 is secured to housing by means of hinges 14. Housing 10 includes spring lock members 16 which can be received within corresponding openings (not numbered) of cover 12 to secure the cover in its closed position. Release button 18 are provided to release the spring lock members 16 when it is desired to open the cover 12. Housing 10 and cover 12 may be made of plastic.

A metal inner casing 19 is secured to the interior of housing 10 by screws or the like (not shown). Two rotatable shredders 20 and 22 are mounted within casing 19. Each of the shredder blades includes a plurality of disk blades (for example, 20a, 22a, etc.) secured to respective axles2l, 23 which are appropriately journalled within opposing surfaces of casing 19. Adjacent blades are separated by annular plastic spacers 20' and 22 suitably secured to axles 21 and 23, respectively.

Corresponding blades of the shredders apply pressure against each other to insure proper cutting or shredding of the paper. In other words, the blades 20a and 22a continuously exert pressure against each other at their point of contact while the two shredders 20 and 22 are rotating.

A plurality of strippers 24, shaped as shown in FIG. 3, are positioned between the blades of shredder 20 and a similar plurality of strippers 26 are positioned between the individual blades of shredder 22. Strippers 24 and 26 may be made of nylon and function to prevent paper which is being fed through the blades from being wound around the axles of the shredders. The strippers are retained by engagement with lips 32 and 34 extending inwardly from casing 19, with each stripper enveloping a portion of a corresponding spacer 20 or 22'.

The shredders 20 and 22 are driven by a motor 30 and suitable reduction gears 28 mounted in a conventional way within metal casing 19.

The cover 12 includes a downwardly extending paper chute 40 integrally formed with the cover and adapted to pass the paper to be shredded into the nip of the shredders. An overhang 42 at one end of the cover includes a fixed retainer portion 44 which is adapted to rest on an upperedge of a wastepaper basket or the like. A second retainer portion 46 is mounted on metal slides 48 and 50 which are received within'tracks 52 and 54, respectively, within the cover 12; This arrangement permits the second retainer portion 46 to be moved relative to the fixed retainer portion 44 to accommodate wastepaper baskets of varying widths.

Approximately at the center of the paper chute 40, a sensing wire 56 is mounted so that it will be moved by a piece of paper inserted through the chute. The sensing wire, when depressed, actuates a miniature snap-action switch 58, suitably secured within cover 12, by means of the switch actuator 60. The contacts (not shown) of switch 58 are connected in the electric circuit of the motor 30 so that when the sensing wire 56 causes the switch 58 to be actuated, the motor operates, thus providing automatic operation in response to insertion of a document into paper chute 40. Wire 56 may be pinned at 59 to a bracket 61 in which switch 58 is mounted. 1

The invention also providesv special means for preventing operation of the shredders when cover 12 is opened. The purpose of this is to prevent inadvertent operation which possibly could result in injury to the user. This protection circuit includes an interlock switch 62 also mounted on the interior surface of cover 12 and including an actuator 66. An L-shaped strip 67 is secured to housing 10 and contacts actuator 66 when the cover 12 is closed. The switch 62 may include normally open contacts connected in series with the motor so that-the motor cannot be operated until the actuator 66 has been depressed.

An override switch 68 may be mounted on the overhang 42 of cover 12, with the switch actuator 69 accessible to the user. The override switch 68 overrides the automatic switch 58 when it is in the off position to prevent operation of the shredder. In the -automatic" switch position, operation of the device is as described above.

in that it facilitates cleaning, while the arrangement of the retainer portions materially increases the versatility of the device.

What is claimed is:

1. A paper shredder comprising a housing,

rotatable shredder blades mounted in said housing,

an upper cover member hingedly connected to said housing, said cover including a paper chute for feeding paper to said shredder blades, one end of said cover member including a retaining portion adapted to rest on a refuse basket or the like, the other end of said cover member including a slide having asecond retaining portion thereon, and

means cooperating with said housing and cover membcrfor securing said cover member to said housing.

2. A paper shredder comprising a housing,

rotatable shredder blades mounted in said housing,

an upper cover member hingedly connected to said housing, said cover including a paper chute for feeding paper to said shredder blades, one end of said cover member including a retaining portion adapted to rest on a refuse basket or the like, the other end of said cover member including a slide having a second retaining portion thereon, means cooperating with said housing and cover member for securing said cover member to said housing, a motor for driving said shredder blades,

a switch for enabling said motor and a sensing wire for actuating said switch, said sensing wire being positioned across said chute.

3. A paper shredder comprising a housing,

rotatable shredder blades mounted in said housing,

an upper cover member hingedly connected to said housing, said cover including a paper chute for feeding paper to said shredder blades, one end of said cover member including, a retaining portion adapted to rest on a refuse basket or the like, the other end of said cover member including a slide having a second retaining portion thereon, means cooperating with said housing and cover member for securing said cover member to said housing, a motor for driving said shredder blades, a first switch for enabling said motor, a sensing wire for actuating said first switch, said sensing wire being positioned across said chute and a safety switch for enabling said motor only when the cover member is closed.

4. A paper shredder comprising a housing,

rotatable shredder blades mounted in said housing,

an upper cover member hingedly connected to said housing, said cover including a paper chute for feeding paper to said shredder blades, one end of said cover member including a retaining portion adapted to rest on a refuse basket or the like, the other end of said cover member including a slide having a second retaining portion thereon, means cooperating with said housing and cover member for securing said member to said housing, said shredder blades including a plurality of dis s and paper strippers positioned between adjacent disks for stripping the paper from the disks.

1 i i i I.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US929960 *Feb 2, 1909Aug 3, 1909Abbot Augustus LowWaste-paper receptacle.
US2101700 *Oct 8, 1936Dec 7, 1937Chesnut Jr Guy ECrusher for used safety razor blades
US3396914 *Mar 15, 1966Aug 13, 1968Centriblast CorpMachine for disintegrating paper and other waste materials
US3620461 *Feb 11, 1970Nov 16, 1971Pelleschi Charles APortable shredder for classified documents
US3623672 *Jun 3, 1969Nov 30, 1971Frank William DeDisposing apparatus for burned-out or defective fluorescent tubes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3827185 *Jul 26, 1972Aug 6, 1974Match E Co LtdIce skate sharpening apparatus
US4166030 *Aug 15, 1978Aug 28, 1979De La Rue Crosfield LimitedShredder
US4778114 *Apr 10, 1987Oct 18, 1988Blower Application CompanyShredding apparatus
US4828188 *Jul 8, 1988May 9, 1989Snyder Peter Lloyd SimonPaper shredding device
US4944461 *Aug 7, 1989Jul 31, 1990Invequest, Inc.Carbon paper shredder
US5039020 *Dec 21, 1989Aug 13, 1991Gao Gesellschaft Fur Automation Und Organisation MbhMethod and apparatus for automatically monitoring the destruction of thin sheet material
US5065947 *May 29, 1990Nov 19, 1991Invequest, Inc.Of The Type Used With Credit Purchases; Compact Unit Adjacent Checkout Counter Or Cash Register
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
US5511732 *Dec 28, 1994Apr 30, 1996Fellowes Manufacturing CompanyDocument shredding machine with continuous stripper
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
US5826809 *Apr 30, 1997Oct 27, 1998Fellowes Manufacturing CompanySupport for cutting cylinders in a paper shredder
US5829697 *Jul 8, 1997Nov 3, 1998Fellowes Manufacturing CompanySupport for cylinders in a paper shredder
US5839675 *Oct 2, 1996Nov 24, 1998General Binding CorporationShredder support assembly and housing
US5954280 *May 12, 1998Sep 21, 1999Fellowes Manufacturing CompanyTop blocker for a paper shredder
US5961059 *Apr 30, 1997Oct 5, 1999Fellowes Manufacturing CompanySupport for drive system in a paper shredder
US5975445 *Apr 14, 1997Nov 2, 1999Ko; Joseph Y.Paper shredding device
US5988542 *May 18, 1998Nov 23, 1999General Binding CorporationDocument shredding devices
US6079645 *Sep 15, 1998Jun 27, 2000General Binding CorporationDesktop shredders
US6250574 *Apr 7, 1999Jun 26, 2001Li-Ming Wu HuangDevice for monitoring paper shredding action of paper shredder
US6357680 *Jun 16, 1999Mar 19, 2002Jere F. IrwinSelf-feeding comminuting apparatus having improved drive motor features
US6390397 *Oct 26, 1999May 21, 2002Joseph Y. KoPaper shredding device
US6460790Jun 25, 2001Oct 8, 2002Li-Ming Wu HuangFrame width adjusting structure of paper shredder
US6644573Jun 18, 2001Nov 11, 2003Jere F. IrwinComminuting apparatus and pneumatic recirculation systems for comminuting apparatus
US6695239Dec 3, 2001Feb 24, 2004Jere F. IrwinSelf-feeding comminuting apparatus having improved recirculation features
US7040559Apr 2, 2004May 9, 2006Fellowes Inc.Shredder with lock for on/off switch
US7048215Feb 13, 2004May 23, 2006Irwin Jere FComminuting apparatus having screen and access tray
US7195185Nov 2, 2004Mar 27, 2007Fellowes, Inc.Shredder with separate waste opening
US7344096Feb 2, 2006Mar 18, 2008Fellowes Inc.Shredder with lock for on/off switch
US7624938Nov 17, 2006Dec 1, 2009Acco Uk LimitedShredding machine
US7631822Jun 1, 2006Dec 15, 2009Fellowes Inc.Shredder with thickness detector
US7631823Jun 22, 2007Dec 15, 2009Fellowes Inc.Shredder with thickness detector
US7631824Jun 26, 2007Dec 15, 2009Fellowes Inc.Shredder with thickness detector
US7635102Jun 21, 2007Dec 22, 2009Fellowes Inc.Shredder with thickness detector
US7641138 *Apr 14, 2008Jan 5, 2010Emily LoAuxiliary unit of paper shredder cutting tools
US7712689Jun 28, 2007May 11, 2010Fellowes Inc.Shredder with thickness detector
US7762486Jan 30, 2008Jul 27, 2010Staples The Office Superstore, LlcShredder
US7798435Mar 22, 2006Sep 21, 2010Fellowes, Inc.Shredder with oiling mechanism
US7871027Feb 13, 2008Jan 18, 2011Techko, Inc.Auto feed shredder apparatus and methods
US7946514Oct 13, 2009May 24, 2011Fellowes, Inc.Shredder with thickness detector
US7946515Dec 3, 2009May 24, 2011Fellowes, Inc.Shredder throat safety system
US7954737Oct 4, 2007Jun 7, 2011Fellowes, Inc.Shredder thickness with anti-jitter feature
US7963468Nov 11, 2009Jun 21, 2011Fellowes, Inc.Shredder with thickness detector
US8008812Jul 22, 2010Aug 30, 2011Aurora Office Equipment Co., Ltd.Paper shredder control system responsive to touch-sensitive element
US8018099Oct 9, 2009Sep 13, 2011Aurora Office Equipment Co., Ltd.Touch-sensitive paper shredder control system
US8020796Jun 16, 2010Sep 20, 2011Fellowes, Inc.Shredder thickness with anti-jitter feature
US8087599Jul 27, 2009Jan 3, 2012Aurora Office Equipment Co., Ltd.Anti-paper jam protection device for shredders
US8091809Mar 24, 2009Jan 10, 2012Fellowes, Inc.Shredder with jam proof system
US8113451Jun 16, 2010Feb 14, 2012Fellowes, Inc.Shredder thickness with anti-jitter feature
US8146845Jul 27, 2009Apr 3, 2012Aurora Office Equipment Co., Ltd. ShanghaiAutomatic shredder without choosing the number of paper to be shredded
US8162244Jul 30, 2008Apr 24, 2012Acco Uk LimitedShredding machine
US8201761Jan 5, 2009Jun 19, 2012Fellowes, Inc.Thickness sensor based motor controller
US8201766Jul 27, 2009Jun 19, 2012Aurora Office Equipment Co., Ltd.Pins or staples removable structure of automatic shredders
US8205815May 15, 2009Jun 26, 2012Fellowes, Inc.Paper alignment sensor arrangement
US8382019May 3, 2010Feb 26, 2013Fellowes, Inc.In-rush current jam proof sensor control
US8424787Jul 19, 2011Apr 23, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8430347Oct 15, 2009Apr 30, 2013Fellowes, Inc.Thickness adjusted motor controller
US8464767Jan 27, 2012Jun 18, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8500049Jul 19, 2011Aug 6, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8505841Jan 7, 2010Aug 13, 2013Techtronic Floor Care Technology LimitedAnti-jamming assembly for shredders of sheet like material
US8511593May 28, 2010Aug 20, 2013Fellowes, Inc.Differential jam proof sensor for a shredder
US8550387Jun 17, 2010Oct 8, 2013Tai Hoon K. MatlinRestrictive throat mechanism for paper shredders
US8672247Aug 19, 2011Mar 18, 2014Fellowes, Inc.Shredder with thickness detector
US8678305Jun 18, 2009Mar 25, 2014Fellowes, Inc.Restrictive throat mechanism for paper shredders
US8708260Aug 8, 2011Apr 29, 2014Aurora Office Equipment Co., Ltd.Depowered standby paper shredder and method
US8723468Apr 28, 2011May 13, 2014Aurora Office Equipment Co., Ltd.Cooled motor
US8757526Aug 19, 2011Jun 24, 2014Fellowes, Inc.Shredder with thickness detector
US8783592Mar 26, 2010Jul 22, 2014Fellowes, Inc.Shredder with thickness detector
USRE40042 *Apr 20, 2005Feb 5, 2008Michilin Prosperity Co., Ltd.Dual-functional medium shredding machine structure
USRE44161Feb 18, 2011Apr 23, 2013Fellowes, Inc.Shredder with thickness detector
USRE44865Apr 27, 2007Apr 29, 2014Michilin Prosperity Co., Ltd.Dual functional medium shredding machine structure
EP0364673A2 *Jul 7, 1989Apr 25, 1990TA TRIUMPH-ADLER AktiengesellschaftHousing for a document shredder
WO2000076667A1 *May 31, 2000Dec 21, 2000Jere F IrwinSelf-feeding comminuting apparatus
Classifications
U.S. Classification241/100, 241/36
International ClassificationB02C18/00
Cooperative ClassificationB02C2018/0069, B02C18/0007, B02C2018/0023, B02C2018/0046
European ClassificationB02C18/00B