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Publication numberUS3028670 A
Publication typeGrant
Publication dateApr 10, 1962
Filing dateApr 15, 1960
Priority dateApr 15, 1960
Publication numberUS 3028670 A, US 3028670A, US-A-3028670, US3028670 A, US3028670A
InventorsJames O Tilly
Original AssigneeJames O Tilly
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Slitting device
US 3028670 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

April 10, 1962 J. o. T|| Y 3,028,670

SLITTING DEVICE Filed April 15, 1960 uw 5PZ. 5

INV EN TOR.

lames 0 Til@ United States Patent 3,028,670 SLITTNG DEVICE James O. Tilly, 4128 S. 32nd West Ave., Tulsa, Okla. Filed Apr. 15, 1960, Ser. No. 22,622 Claims. (Cl. 30--294) This invention relates to slitting devices and to those devices particularly useful as letter openers or the like and having provision for replacing the cutting blade.

in brief the invention comprises a body portionv of generally ilat plate-like construction, preferably formed of molded plastic material and thus readily adaptable for the imprinting thereon of advertising material or the like. The body is provided with a slot extending close to one edge and parallel thereto, and in the base of which a removable cutting blade is provided. The blade has a generally hook-shaped cutting edge whereby to prevent jamming of paper or other cut material at an edge of the slot and the blade is further permanently secured to a blade holder removable from the body. To replace the cutting blade it is only necessary to release and remove the blade holder and to replace the same with a new assembly including a sharp cutting blade. The blade holder is provided with integral resilient means serving to lock the same on the body and the body is provided with an opening through which an instrument may be inserted to displace the resilient locking means and thus release the blade holder for removal.y

lt is therefore an object of this invention -to provide an improved slitting device suitable for use as a letter or carton opener and also useful for other purposes.

Another object of the invention is to provide a slitting device of the type set forth which is inexpensive to produce yet highly efcient and reliable and endurable.

Still another object of the invention is to provide-a slitting device of fiat plate-like configuration whereby it may serve also for novelty or advertising purposes.

A further object is to provide aV slitting device of the type set forth including a replaceable cutting blade and novel holding and locking means therefor.

Other and additional objects will become apparent to those skilled in the art as the description proceeds with reference to the accompanying drawings, wherein:

FIG. 1 is a top plan view of a device embodying the present invention;

FlG. 2 is a side elevational view thereof;

FIG. 3 is a vertical sectional View taken along the line 3-3 of FIG. l;

FIG. 4 is an enlarged transverse sectional view taken along the line 4-4 of FIG. 3;

FIG. 5 is an enlarged fragmentary sectional view taken along the line 5 5 of FIG. 3;

FlG. 6 is a perspective view of the blade and holder assembly; and

FlG. 7 is a plan view of the novel blade and illustrating the manner in which a plurality of blades are cut from a single strip of material without waste.

Referring to the drawings, numeral 2 indicates the body portion of the slitting device of the present invention and as shown comprises a substantially dat plate-like body having a front edge 4, a rear edge 6, and a bottom edge 8. The body is formed with a slot 10 extending rearwardly from the front edge 4 and adjacent and substantially parallel to the bottom edge 8. That portion or the body between slot lil and bottom edge 8 is preferably pointed, as at 12, and is curved or somewhat rounded in transverse section as best seen in FIG. 5. A rectangular passageway 14 is formed in the body 2 extending rearwardly from the bottom of slot 10, at 16, and in substantial alignment with slot 10. The passageway 14 extends rearwardly through the rear edge 6 of the body 2. which is formed with a transverse notch 18 into which the passageway 14 extends. The passageway Y wardly from that position the passageway 14 is relatively arrow and continues forwardly to define narrow grooves 2?. and 24 at the top and bottom of the slot 10. The grooves 22. and 24 are of a width to rather snugly but slidabiy receive the upper and lower edge portions of a cuttingblade 25. The cutting blade 26 is preferably formed from a strip of suitable metal as indicated at 28 in FIG. 7 and is stamped therefrom with `a front edge 30 extending upwardly and rearwardly in an oblique direction from the bottom edge of the blade and then curving upwardly and forwardly to form a hook portion near the upper edge of the blade.

The rear edge 32 of blade 26 is formed of complementary shape to the forward edge 30 so that the blades may be stamped from the strip 28 without waste. In stamping the lades from a strip 2S, openings 34 are provided near the upper edge of the blade at the rear end of the tang 36 defined by the rear edge blade shape.

After stamping, the blades are sharpened at their forward edge to form the cutting edge shown. Each blade 26 is securely fixed to a molded holder 38 by having the tang 36 embedded and .intcrlocked with the holder 38. The material of holder 38 is molded around the tang 36 and extends through opening 3'4 and thus permanently and securely locas the blade and holder together as a unit.

'The holder .33 is of generally rectangular crosssectional shape complementary to the passageway 14 pre-` viously described and is provided with an enlarged head 4i) at the rear end thereof which is complementary in shape to the notch 18. v Thus, the head 4l) serves as a stop means to limit inward movement of the holder 38 in passageway 14 to a position where the cutting edge Sil of the blade 26 extends across the bottom portion of notch 10, as clearly shown in FIG. 2. It is understood that the upper and lower edges of the blade 26 at this. time reside in the grooves 22 and 24 previously described.

The holder 33 is preferably molded of a synthetic resin material having resilient characteristics and is molded to define a notch 42 at its lower edge. The holder further includes a rearwardly extending integral resilient linger 44 integrally joined to the holder 38 at the forward end of notch 42. The linger 44, when unstressed, extends downwardly and rearwardly so that its rear end normally projects downwardly below the lower edge of holder 38.

The body 2 is provided with an opening 46 extending upwardly from its lower edge 8 into communication with the passageway 14 and is so positioned that when the head 46 of holder 38 is rmly nested in the notch 18 the free end of linger 4d projects downwardly into the opening 46 and engages the rear edge thereof. Thus the finger 44 serves to releasably lock the blade and holder in the body 2 against inadvertent withdrawal while head 40 serves to prevent accidental forcing of the holder 38 too far inwardly in passageway 14. When it is desired to remove the holder 38 and blade 26 for purpose of replacement or otherwise, any slender instrument, such as indicated at 48, may be inserted in opening 46 to depress the end of resilient linger 44 inwardly into notch l2 whereupon the head 45t may be grasped and the holder and blade withdrawn from the body 2. A new holder and blade are inserted in an obvious manner and pushed inwardly until the end of finger 44 snaps into opening 46 and the new blade and holder are then locked in position for use.

In the customary type of letter opener a sharpened blade is provided bearing much the same relationship to a slot as shown herein. However, it is customary for the cutting edge of the blade in such prior devices to extend obliquely rearwardly and upwardly of the slot and to intersect the upper edge of the slot at an acute angle. With such devices considerable difficulty is encountered in having paper or whatever other material is being cut jam and pile up in the angle between the cutting edge and top edge of the slot. The shape of the cutting edge as disclosed and described herein prevents such jamming since any paper fibers approaching the top of slot 10 engage the overhanging upper portion of the sharpened cutting edge 3! and are completely severed and cut without jamming against the top of the slot 10.

The manner of use of the disclosed device is obvious insofar as opening of letters, cartons or the like is com cerned, but it is to be pointed out, particularly with the shape of cutting edge shown, the device has wider utility. For example, it may be used to slit ish prior to cleaning. For this latter purpose it is preferred that the sharpened portion l2 be made of metal, preferably non-corrosive. As shown in the drawings, a metal tip 50 is formed and is provided with a tang 52 having an enlarged head 53 thereon. The metal tip 50 is placed in the mold at the time the body 2 is molded and the material of body 2 embraces and interlocks with tang 52 and head 53 to securely lock the metal tip in place.

While a single specic embodiment of the invention has been shown and described herein, it is to be understood that the same is merely illustrative, that other forms may be resorted to within the scope of the appended claims.

I claim:

1. In a slitting device, a tlat unitary body having front, rear, and bottom edges, a slot extending inwardly from said front edge adjacent and generally parallel to said bottom edge, a peripherally closed passageway in said body extending from the rear of said slot, in substantial alignment therewith, through said rear edge, a blade holder slidable in said passageway, a cutting blade xedly secured to said blade holder and having a cutting edge extending obliquely across said slot and facing toward said front edge, and resilient locking means integral with said blade holder and releasably engageable with stop means on said body for releasably locking said blade holder in said passageway.

2. A device as defined in claim 1 wherein said blade is formed so that said cutting edge extends obliquely rearwardly from the edge of said slot adjacent said bottom edge and then curves obliquely forwardly adjacent the opposite edge of said slot.

3. A device as defined in claim 1 wherein said locking means includes an integral resilient linger on said blade holder, extending generally rearwardly thereon, and an opening extending from the outer surface of said body into said passageway, the end of said finger engaging a side of said opening.

4. A `device as defined in claim l wherein said body is provided with a notch extending across the rear edge thereof, said passageway opening into said notch, said blade holder having an integral enlargement at the rear end thereof complementary to and nested in said notch.

5. In a slitting device, a flat unitary body having front, rear, and bottom edges, a slot extending inwardly from said front edge adjacent and generally parallel to said bottom edge, a peripherally closed passageway in said body extending from the rear of said slot, in substantial alignment therewith, through said rear edge, a blade holder slidable in said passageway, a cutting blade secured to said blade holder and having a cutting edge extending obliquely across said slot and facing toward said front edge, and resilient locking means secured to said blade holder and releasably engageable with an edge of an opening extending into said passageway for releasably locking said blade holder against withdrawal from said passageway, said body being provided with a notch extending across the rear edge thereof, said passageway opening into said notch, said blade holder having an enlargement at the rear end thereof positioned in said notch, and cooperating stop means on said enlargement, and said body, forwardly of said rear edge, for limiting forward movement of said blade holder in said passageway.

References Cited in the file of this patent UNITED STATES PATENTS 296,492 Wheeler Apr. 8, 1884 1,449,408 Hull Mar. 27, 1923 1,498,753 Rendlich June 24, 1924 1,515,952 Joell Nov. 18, 1924 1,813,868 Smiraldo July 7, 1931 2,124,615 Foltz July 26, 1938 2,329,805 Wilson Sept. 2l, 1943 2,535,555 Tilly Dec. 26, 1950 2,611,178 Whipple et al Sept. 23, 1952 2,941,294 Vosbikian et al. June 21, 1960

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US296492 *Apr 8, 1884 Lock-stitch ripper
US1449408 *Oct 18, 1921Mar 27, 1923Hull Marguerite EKnife
US1498753 *Mar 29, 1924Jun 24, 1924Rendlich Daniel ICarcass-opening device
US1515952 *Oct 7, 1920Nov 18, 1924Frederick W JoellEnvelope opener and finger-nail cleaner
US1813868 *Jul 17, 1930Jul 7, 1931Antonio SmiroldoKnife guard
US2124615 *Aug 29, 1935Jul 26, 1938Foltz WallieKnife
US2329805 *Dec 30, 1942Sep 21, 1943Wilson Sr Fred GElectric cable cutter
US2535555 *Apr 17, 1947Dec 26, 1950James O TillyLetter and package opener
US2611178 *Mar 3, 1947Sep 23, 1952Burdette E BostwickPocket implement
US2941294 *Jun 18, 1958Jun 21, 1960Peter S VosbikianHandles for manual tools with means to interlock with the shank of a working tool
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3365798 *Apr 8, 1966Jan 30, 1968Frank W. CunninghamDevice for cutting soft wrappings
US3803713 *Nov 26, 1971Apr 16, 1974Jones FCarton opening cutter
US3835536 *Jan 31, 1973Sep 17, 1974Marcoux ESheet material cutter
US4081907 *Aug 9, 1976Apr 4, 1978Bosshold Barry LLetter opener device
US4283853 *Mar 24, 1980Aug 18, 1981Fazzini Daniel BCutting tool
US5285577 *May 22, 1992Feb 15, 1994Quick Point, Inc.Letter opener with protected recess for business card and removable slide-in cover
US5524348 *Aug 4, 1994Jun 11, 1996Tipp; Raymond P.System for slitting and opening packages
US5724738 *Dec 13, 1996Mar 10, 1998Ballarini; FrancoEnvelope opener with disposable blade
US5896667 *Jun 18, 1997Apr 27, 1999Hawkins; Jennifer B.Plastic wrap piercing-cutting device
US5908433 *May 10, 1996Jun 1, 1999Stryker CorporationCarpal tunnel knife
US6032371 *Aug 27, 1998Mar 7, 2000Welcome Company Ltd.Safety cutting device
US6240645 *May 14, 1998Jun 5, 2001Clover Mfg. Co., Ltd.Sewing cutter
US8006390Aug 30, 20113M Innovative Properties CompanyMedia cutting and ribbon curling device
US8171647Jul 27, 2007May 8, 20123M Innovative Properties CompanyCutting device with actuating mechansim
US8176640May 15, 20123M Innovative Property CompanyMedia cutting device
US20060113292 *Jan 11, 2006Jun 1, 2006Welcome Co., Ltd.Table-top electric heat sealer
US20060236550 *Apr 21, 2006Oct 26, 20063M Innovative Properties CompanyMedia cutting device
US20070245571 *Dec 28, 2006Oct 25, 20073M Innovative Properties CompanyReinforced media cutting device
US20070249477 *Nov 17, 2006Oct 25, 20073M Innovative Properties CompanyMedia cutting and ribbon curling device
US20080040932 *Jul 27, 2007Feb 21, 20083M Innovative Properties CompanyCutting device with actuating mechansim
US20080116234 *Nov 16, 2007May 22, 20083M Innovative Properties CompanyRibbon curling device
US20110232103 *Sep 29, 2011Trillium Worldwide Group Inc.Cutting tool for opening package
USD667715 *Sep 25, 2012Hsiu-Man Yu ChenLetter opener
WO2008095300A1 *Feb 5, 2008Aug 14, 2008Glen Sheldon Gerald CollardApparatus and method for cutting tape on a hockey stick blade
Classifications
U.S. Classification30/294, 30/DIG.300, D08/102
International ClassificationB26B27/00, B43M7/00
Cooperative ClassificationY10S30/03, B43M7/002, B26B27/00, B26B27/005
European ClassificationB26B27/00, B43M7/00B, B26B27/00B