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Publication numberUS2681502 A
Publication typeGrant
Publication dateJun 22, 1954
Filing dateOct 9, 1953
Priority dateOct 9, 1953
Publication numberUS 2681502 A, US 2681502A, US-A-2681502, US2681502 A, US2681502A
InventorsBlack Orman L
Original AssigneeBlack Orman L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety box opener
US 2681502 A
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Description  (OCR text may contain errors)

June 1954 o. L. BLACK 2,681,502


The present invention relates to knives and in particular to a knife for opening cardboard or corrugated paper boxes such as are used for containing packaged foods and the like.

Many types of knives are presently in use and generally the blades are exposed to such an extent that the package is penetrated to a depth at which the contents are exposed to the knife edge. In the instance where the outer carton contains small packages of foods, such as cornflakes, it has frequently happened that an inexperienced store clerk has slit open all of the small packages that are next to the side being cut. Damage to foods and merchandise amounts to a serious loss to the store owner or jobber.

The present invention has for its principal object to provide a knife which in the hands of an inexperienced clerk is so constructed as to make it virtually impossible to damage a cartons contents.

Another object of the invention is to provide such a knife which penetrates the carton a calculated depth only.

A still further object is to provide such a knife which has means for pushing away the contents of a carton ahead of the cutting edge.

Another object of the invention is to provide a guide means on part of the handle for assuring that the knife is drawn at the proper draft for making the cutting edge enter the carton at the proper angle and to the desired depth.

Briefly described, the safety box opener is made of metal or hard plastic and has a handle or shank curved downwardly and back towards the cutting end, which is flattened to a wide portion up against which a sharpened blade, preferably square or rectangular in shape, is secured by a thumb screw and nut. The flattened cutting end of the knife has a hooked portion substantially rounded and the blade is positioned behind the rounded nose. The nose pushes ahead of the sharpened edge to depress any inner carton and material away from the blade.

These objects and advantages of the invention will be apparent upon consideration of the following description when taken in connection with the annexed drawings, in which:

Fig. 1 is a plan view in elevation of the invention showing the blade and rounded portion in cutting position within the carton.

Fig. 2 is a top view of the invention showing its cutting position along the top side of a carton. Fig. 3 is a partial view in section taken on line 3-3 of Fig. 1, and

Fig. 4 is a perspective view of the knife without the blade or thumb screw.

Referring in more particular to the drawing, in which like numerals indicate like parts throughout the several views, it will be seen that the invention comprises a round shank. or handle [0 having a curved guide portion Ill and a flattened cutting end 12. On the end I2 is a lug l3, either pressed outwardly by an upsetting tool or otherwise formed to provide a stop for the blade [4 which is removably secured by means of the thumb nut and screw [5 through the square hole It. A projecting hooked portion l1 projects beyond the edge or end of the blade 14, and as seen in Fig. 1 depresses the contents is of the carton l9 away from the blade [4. The curved guide portion II, as seen in Figs. 1 and 2 is in line with the blade l4 and provides the proper draft to the cutting stroke and also provides the proper angle of the blade [4 and hooked portion H within the carton.

The handle in is preferably smoothly rounded and coated or covered with a resilient rubber hose 2 I, or other material which provides a comfortable grip. The operation of the tool is fully apparent from the foregoing description, and it will be easily understood that the chief advantage is the way in which the hooked portion pushes the cartons contents sufficiently far enough away so that the blade l4 does not have a chance to damage the contents.

While only a single embodiment of the invention has been illustrated and described, many changes and modifications are contemplated and may be made in the invention without departing from the spirit and scope of the invention, in which is claimed:

1. A carton opening knife comprising a handle portion, a guide portion consisting of an extension of one end of the handle portion bent forwardly towards the opposite end thereof, a cutting portion on said opposite end, means on said cutting portion for removably securing a blade thereon, and a curved portion on said cutting portion projecting rearwardly towards said handle a sumcient distance ahead of a blade secured to said cutting portion to depress objects away from the blade.

2. A carton opening knife comprising a substantially elongated shank, an extension on said handle bent back on itself at one end of said shank, a flattened other end of said shank, a blade, means removably securing said blade to said flattened end of said shank, and a curved portion of said flattened end of said shank positioned rearwardly and projecting outwardly a little distance beyond the blade fixed therealong.

3. A carton opening knife comprising a handle, an extension on said handle bent back on itself and downwardly toward a carton to be opened, a knife-bearing portion, and a rounded projection in the shape of a hook on said knife-bearing portion positioned to project into a carton being opened a sufiicient distance to depress objects within the carton.

4. A carton opening knife comprising a rodshaped handle portion, a resilient covering on said portion, a flat section forward of said portion, a curved hook on the downmost side of said flat section, a blade removably secured to said flat section on one side thereof and projecting across the opening defined by said hook, and guide means at the other end of said handle portion for positioning said hook and said blade relative to a surface to be cut.

5. The device of claim 4 in which said blade is secured to said flat section by a thumb screw.

6. The device as set forth in claim 5 in which said thumb screw traverses a square hole in said blade and in said flat section.

7. The device as set forth in claim 6 together with an upwardly projecting lug on the side of said flat section for positioning said blade.

No references cited.

Non-Patent Citations
1 *None
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3178812 *Nov 19, 1962Apr 20, 1965Lurie August JCarton opening device
US4062118 *Jul 8, 1976Dec 13, 1977Paul ModafferiKnife having an interchangeable blade
US4442595 *Apr 5, 1982Apr 17, 1984Sharrow Robert FKnife guide
US4570339 *Jun 28, 1984Feb 18, 1986Magic Pantry Foods Inc.Kitchen utensil for food retort pouches
US4700478 *Apr 12, 1985Oct 20, 1987C.& E. Fein Gmbh & Co.Knife for cutting through the adhesive that fastens a window pane in place
US4980976 *Nov 16, 1989Jan 1, 1991C. & E. Fein Gmbh & Co.Knife with a straight cutting part
US4989320 *Apr 21, 1989Feb 5, 1991C. & E. Fein Gmbh & Co.Knife
US5038478 *Jul 24, 1990Aug 13, 1991C. & E. Fein Gmbh & Co.Paring knife
US5282316 *Jan 4, 1993Feb 1, 1994National Polymers Inc.Hand held razor-containing cutting device
US5412871 *Aug 17, 1994May 9, 1995Reyburn; Thomas P.Safety stock carton knife
US5539983 *Feb 23, 1995Jul 30, 1996Reyburn; Thomas P.Safety stock carton knife
US6182364Sep 1, 1998Feb 6, 2001Thomas P. ReyburnSafety stock carton knife tip assembly and method of making
US6434835 *Nov 17, 1999Aug 20, 2002C. & E. Fein Gmbh & Co.Cutting knife for cutting through adhesive beads on glass panes of vehicles
US6442844 *Nov 17, 1999Sep 3, 2002C. & E. Fein Gmbh & Co.Cutting knife for cutting through adhesive beads on glass panes of vehicles
US6591501 *Jul 28, 2000Jul 15, 2003Kenneth Gary PhillipsUtility knife
US6619013 *Mar 22, 2001Sep 16, 2003Percy W. DismukesContainer flap pull
U.S. Classification30/2, 30/286, 30/340
International ClassificationB65B69/00
Cooperative ClassificationB65B69/0033
European ClassificationB65B69/00C