Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2973129 A
Publication typeGrant
Publication dateFeb 28, 1961
Filing dateNov 14, 1957
Priority dateNov 14, 1957
Publication numberUS 2973129 A, US 2973129A, US-A-2973129, US2973129 A, US2973129A
InventorsCampbell Laurie H, Stone Orison W
Original AssigneeContinental Can Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dual locking construction for paperboard wrappers
US 2973129 A
Abstract  available in
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

DUAL LOCKING CONSTRUCTION FOR PAPERBOARD WRAPPERS Filed Nov. 14, 1957 Feb. 28, 1961 o. w. STONE ET AL 3 Sheets-Sheet 1 HEQD.

INVENTOR. ORISON W. STONE LAURIE H. CAMPBELL ATTORNEYS.

Feb. 28, 1961 Q STONE ET AL 2,973,129

DUAL LOCKING CONSTRUCTION FOR PAPERBOARD WRAPPERS Filed Nov. 14, 1957 s Sheets-Sheet 2 W. STONE LAURIE H. CAMPBELL AfTOR/VEKS Feb. 28,1961 0. w. STONE ET AL 2,973,129

DUAL LOCKING CONSTRUCTION FOR PAPERBOARD WRAPPERS Filed Nov. 14, 1957 :s Sheets-Sheet s Q Q 5* 1; n 9 9 11 IS V M la I I8 lfi l law Is I? IQ Qi-l? I8 QB 1; I 1; 188 gm 10 s e a lo INVENTOR. ORISON W. STONE LAURIE H. CAMPBELL- United States PatentfC) DUAL LOCKING CONSTRUCTION FOR PAPERBOARD WRAPPERS Orison W. Stone, Valley Cottage, N.Y., and Laurie H.

Campbell, New London, Conn., assignors to Contin'ental Can Company, Inc., New York, N.Y., a corporation of New York Filed Nov. 14, 1957, Ser. No. 696,365

1 Claim. (Cl. 229-16) The invention relates to an improved locking construction for a paperboard wrapper. It has special application to wrap-around cartons or carriers for canned goods as used, for example, in retail packaging of cans of beer and foods in lots of two, three, six or more cans.

Such wrap-around cartons or carriers are made from rectangular blanks folded into the form of a rectangular tube and having edges overlapped at one side of the tube. These overlapped edges may be glued together so as to hold the paperboard wrapper tightly around the cans, and when this is done the resulting package is quite strong and will meet high standards of acceptability. Also the package can be made tight enough that, when provided with typical slotted fold lines or other customary retaining means, the cans will be held effectively against dropping out of the open ends of the Wrapper. Sometimes, however, it is considered desirable to have a wrapper which does not have to be glued together. In such instances, it has been a common expedient to use interlocking tongues and slots in the overlapping edges of wrapper. But this does not make a very strong package, nor one which can be relied on to remain as tight as a glued wrapper. An object of our invention is to provide an improved locking construction which will more nearly compare with a glued wrapper in respect to strength, tightness and resistance to stresses tending to tear the wrapper open at its overlapped edges.

According to our invention the wrapper is made with what may best be described as a dual locking construction including: (1) a first locking means comprising interlocking tongues and slots in the overlapped edges of the wrapper, and (2) a second locking means comprising locking end flaps folded into overlapping relation at the corners of the wrapper and having interlocking tongues and slots in the corner overlaps. We have found that these two locking means coact one with the other in resisting stresses tending to tear the wrapper open at its overlapped edges.

With reference to the drawings we shall now describe the best mode contemplated by us for carrying out our invention.

Fig. 1 is a bottom perspective view of a paperboard wrapper including our dual locking construction.

Fig. 2 is a schematic view representing the end of such a wrapper and showing how lateral tearing stresses on the first locking means are resisted also by the second locking means.

Fig. 3 is a similar schematic view showing how downward load stresses on the first locking means are resisted also by the second locking means.

Fig. 4 is a plan view of the paperboard blank from which the wrapper of Fig. l is formed.

In Fig. l, we show how our invention is applied to a paperboard wrapper 4 having the general form of a foursided tube made from a rectangular blank having edges 5 and 6 overlapped at one side, 7, of the tube. Our dual locking construction includes a first locking means com- 2,973,129 Patented Feb. 2 8, 1961 prising interlocking tongues and slots, 8 and 9, respectively, and 10 and 11, respectively. These tongues and slots may be of any well known construction and they therefore need not be described in detail. However, they should be of the type wherein the tongues have projections which engage the slots firmly to prevent the tongues from pulling out once they have been pushed through the slots to make the lock. The locking con'structionfurther includes a second locking means comprising locking end flaps 12 to 16, inclusive, folded into overlapping relation at the corners of the wrapper and having interlocking tongues and slots 17 and 18, respectively, in the corner overlaps. The end flaps 12 to 16 may be considered to have afunction as a partial end closure for the wrapper, but we recognize that such partial end flaps have been known heretofore. What weare primarily concerned with here is the problem of how to reinforce an unglued wrapper so that its overlapping edges, when held together only by little interlocking tongues or tabs, can be kept from tearing apart. We achieve this reinforcing function by using flaps overlapping and interlocked at the corners of the wrapper.

The value of this reinforcing function will be appreciated from a study of the schematic views, Figs. 2 and 3. Here for simplicity we use an abstract form to represent the first and second locking means. The first is represented at 8, 9', the second at 17. Referring to Fig. 2, consider first the lateral stresses tending to pull the wrapper open at its sides. Taking the hypothetical case where such stresses are sufl'iciently great to tear open the package, we may represent this hypothetical condition by the dot dash lines. Notice that the tongues and slots 8', 9 have been pulled apart as represented at 8", 9", and that the second locking means have also been pulled apart as represented by the tongues 17' and slots 18". Therefore the two locking means coact one with the other in resisting the lateral stresses tending to tear the wrapper open at its overlapped edges. Similarly, in Fig. 3, we consider the results of over limit stresses imposed by a load acting downwardly against the bottom of the wrapperas when the wrapper has a handle on the top (not shown) and is being used as a carrier. The relative displacements of the locking components 8", 9" and 17, 18", explain how the two locking means coact with one another in resisting such downward loading stresses. These theoretical analyses are offered merely in an attempt to aid others in appreciating the nature of our dual locking construction, and we do not wish to be bound by any particular theory of its operation or as to why it is so effective for the purposes stated.

The terms and expressions which we have employed are used in a descriptive and not a limiting sense, and we have no intention of excluding such equivalents of the invention described, or of portions thereof, as fall within the scope of the claim.

We claim:

Dual locking construction for a paperboard wrapper having the general form of a four-sided tube made from a rectangular blank having edges overlapped at one side of the tube, said dual locking construction including: a first locking means comprising interlocking tongues and slots in said overlapped edges, said tongues folded about locking edges of the slots arranged substantially parallel to the axis of the tube, and a second locking means comprising partial end fiaps folded into overlapping relation at the corners of the wrapper to form an inwardly projecting marginal flange extending around the ends of the tube, said end flaps having interlocking tongues and slots in the four corners of said marginal flange, said lastnamed tongues folded about locking edges of the slots with which they interlock, said locking edges disposed References Cited in the file, of this patent UNITED STATES PATENTS Blandford Feb. 3, 1925 4 Kretchmer July 6, 1943 Cohen et al Oct. 31, 1944 Acker Oct. 31, 1950 Keller Nov. 10, 1953 Seith May 17, 1955 Gentry Mar. 26, 1957

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1525360 *May 21, 1923Feb 3, 1925Herbert BlandfordUnit box structure
US2323782 *Sep 14, 1939Jul 6, 1943Murray KretchmerCollapsible box
US2361603 *Feb 5, 1943Oct 31, 1944Samuel L CohenCollapsible paperboard box
US2527784 *Apr 14, 1950Oct 31, 1950Container CorpVegetable box
US2658660 *Apr 28, 1948Nov 10, 1953Keller Clifford MFolding box
US2708545 *Jan 3, 1950May 17, 1955Cornell Paperboard Products CoEnd-closing, top-opening shipping container
US2786572 *Oct 4, 1954Mar 26, 1957Atlanta Paper CompanyPaperboard carrier for cans
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3104795 *Jun 2, 1961Sep 24, 1963 Carton end closure
US3270914 *Jul 17, 1964Sep 6, 1966Olin MathiesonWrap-around carton blank with end panel lock
US3327845 *Apr 26, 1965Jun 27, 1967Mead CorpStrap for carrying containers
US3339724 *Dec 1, 1964Sep 5, 1967Packaging Corp AmericaPackaging
US3589593 *Jul 1, 1969Jun 29, 1971Continental Can CoWrap-around carrier with latching and spacer means
US3779448 *Jun 23, 1971Dec 18, 1973Wootten William AInterlocking seam structure
US4526316 *Mar 16, 1982Jul 2, 1985Federal Paper Board Co., Inc.Lock arrangement for cartons
US4655388 *Mar 3, 1986Apr 7, 1987Central States Products CompanyDiskette folder with strap fastener
US4785991 *Sep 22, 1986Nov 22, 1988Manville CorporationSleeve-type carrier with improved handle
US4815599 *Jun 20, 1988Mar 28, 1989Manville CorporationWrap-around carrier for bottles
US5328088 *Mar 1, 1993Jul 12, 1994John LonczakNewspaper transport pack
US5341983 *Aug 18, 1993Aug 30, 1994Mcgrath Stephen ELocking join for boxes
US5503324 *May 9, 1995Apr 2, 1996Advanced Container CorporationShipping and display box
US6076730 *Apr 21, 1999Jun 20, 2000International Paper CompanyCarton with locking mechanism
US6293460Apr 20, 2000Sep 25, 2001International Paper CompanyCarton with locking mechanism
US6481618 *Sep 27, 2001Nov 19, 2002Sca Hygiene Products AbDivisible transport box
US6926195 *Aug 29, 2003Aug 9, 2005World Kitchen (Ghc), LlcBox with tab closures
US6938818 *Jul 29, 2003Sep 6, 2005Georgia-Pacific CorporationMinor-end loading carton
WO1988002607A1 *Sep 16, 1987Apr 21, 1988Manville CorpWrap-around carrier for bottles
WO1999057023A1 *Apr 21, 1999Nov 11, 1999Tony Joseph AbshireCarton with locking mechanism
Classifications
U.S. Classification206/427, 229/157, 206/434, 229/185
International ClassificationB65D5/20, B65D5/30
Cooperative ClassificationB65D5/30, B65D5/2057
European ClassificationB65D5/30, B65D5/20E1