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Publication numberUS3727829 A
Publication typeGrant
Publication dateApr 17, 1973
Filing dateFeb 19, 1971
Priority dateFeb 19, 1971
Publication numberUS 3727829 A, US 3727829A, US-A-3727829, US3727829 A, US3727829A
InventorsHuni C
Original AssigneeMazereu M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Closure device for plastic bags
US 3727829 A
Abstract
A closure device for plastic bags or sacks formed as a one-piece body of molded plastic and comprises a plate with upper and lower portions and an elongate slot provided therebetween, cooperating latching elements arranged in the portions for latching engagement with one another, and hinges disposed at the ends of the elongate slot connecting the portions of the plate to each other. Projections extending from the facing edges of the plate portions at the hinges for limiting the pivoting zone of the hinge and therefore facilitating the alignment of the latching portions in bringing them into latching position. A tear-away guarantee strip may be provided to seal the elongate slot requiring its removal to gain access to the interior of the bag or sack.
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United States Patent 1 1 11 3,727,829 Hi'ini [451 A r. 17, 1973 41 CLOSURE DEVICE FOR PLASTIC BAGS Inventor: Christian Hiini, Ris Orangis, France Michel Claude Jean Mazereu, (Loiret-Cher), France Feb. 19, 1971 Assignee:

Filed:

Appl. N0.:

, References Cited UNITED STATES PATENTS 8/1969 Suominen ..229/54 R 2/ I969 Lemelson ..229/62 X 17 9/1970 Schwarzkopf ..229/54 R X 3,282,493 11/1966 Kamins ..229/62 X Primary ExaminerDonald F. Norton Attorney-Young & Thompson 5 7 ABSTRACT A closure device for plastic bags or sacks formed as a one-piece body of molded plastic and comprises a plate with upper and lower portions and an elongate slot provided therebetween, cooperating latching elements arranged in the portions for latching engagement with one another, and hinges disposed at the ends of the elongate slorconnecting the portions of the plate to each other. Projections extending from the facing edges of the plate portions at the hinges for limiting the pivoting zone of the hinge and therefore facilitating the alignment of the latching portions in bringing them into latching position, A tear-away guarantee strip may be provided to seal the elongate slot requiring its removal to gain access to the interior of the bag or sack.

10 Claims, 12 Drawing Figures CLOSURE DEVICE FOR PLASTIC BAGS BACKGROUND OF THE INVENTION The present invention relates to closure devices for bags or sacks in particular plastic bags or sacks.

Generally such closure devices comprise two separate parts welded to the opening of the bag or sack and include weld reinforcements in the form of metal clips which strengthen the side edges to prevent the side of the bag or sack from tearing when the bag is opened or during handling of the bag or sack.

Other closure devices for such bags have been found difficult to maintain in closed position during carrying owing to stresses acting thereon.

SUMMARY OF THE INVENTION An object of the present invention is a closure device for such bags which overcomes above-mentioned disadvantages.

To this end the present invention provides a onepiece or unitary closure device, preferably formed of plastic, which have hinge means of a reduced section which do not in normal use urge a force on the latching member of the closure device which could effect their opening.

Further, these hinge means are associated with means for limiting the zone of pivoting to thereby facilitate the alignment of the latching elements on closing. The hinge means according to the invention offers considerable resistance to tearing both during the latching and unlatching operations as well as the separating of the portions of the plate to gain access to the interior of the bag. A more particular object of the invention is a unitary closure device for a bag comprising a plate having first and second portions, an elongate means adapted to provide access to the interior of the bag and disposed between the first and second plate portions, at least one latching element on one of the plate portions adapted to engage a cooperating latching element on the other of the portions for maintaining the closure device in a closed position preventing access to the elongate means, and hinge means connecting the plate portions at the ends of the elongate means for pivotably mounting said first portion relative to said second portion, said hinge means having a thickness substantially less than that of the plate, and means for limiting the pivoting zone of the hinge for facilitating the alignment of latching elements on closing the device.

According to a further object of the invention the means for limiting the zone of pivoting comprises opposed pairs of projections extending from the plates towards each other and disposed at the hinge means spaced from the elongate means.

According to a still further object of the invention the elongate means comprises a tear-away strip sealingly arranged between the portions of the plate and adapted to be removed to expose an elongate slot between the hinge means and the plates.

Further, such a closure device may simply be manufactured in one piece by injection molding of plastic such a polyvinylchloride the bag with which it is to be associated being attached thereto by welding.

Additional features and advantages of the present in vention will be brought in the description which follows hereinbelow by way of example with references to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I shows a view in perspective of a closure device for a plastic bag according to the invention in its unlatched position FIG. 2 shows a view in perspective of the closure of FIG. I in its latched position FIG. 3 shows a detail on an enlarged scale and in perspective of the hinge and cooperable latching elements shown in FIG. I

FIG. 4 shows a slightly enlarged cross-section of the closure device of FIG. 1 taken along the line lV-IV FIG. 5 shows a slightly enlarged cross-section taken along the line VV of FIG. I

FIG. 6 shows a cross-section taken along the line VIVI in FIG. 2;

FIG. 7 shows a schematic view in perspective of the bag opened giving access to the interior FIG. 8 shows a view in perspective of an alternative embodiment of the closure device according to the invention in its sealed condition FIG. 9 shows a view in perspective of the embodiment shown in FIG. 8 with the tear-away strip in the process of being removed FIG. 10 shows a cross-section of the closure plate taken along the line XX in FIG. 8

FIG. Ill shows an enlarged cross-section of a detail of FIG. 10 and FIG. 12 shows a view in section of an alternative tear-away strip to that shown in FIG. 10.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Considering first the embodiment of FIGS. 1-7 a unitary or one-piece closure device 10 formed of relatively rigid plastic material, for example polyvinylchloride, is provided on a bag or sack 12 formed of a relatively thin plastic sheet material. The bag or sack preferably comprises a front sheet 14 welded along its edges to a rear sheet 16. The bag or sack could however be formed of a continuous pouch with no welds or seams.

The front and rear sheets 14 and 16 are in turn welded at 17 and I8 to the lower portion 20 and the upper portion 22 of the closure device or plate 10. An elongate slot extends between the upper and lower portions 20 and 22 along substantially their entire lengths. Hinges 2% are provided at the ends of the slot 24, one of which is shown in detail in FIG. 3. A projecting latching member 25 with a slightly enlarged head portion 25a extends from the lower portion 20 and is adapted to be received in receiving aperture 26 provided in the upper portion 22 and suitable arranged and dimensioned to receive and maintain the projecting portion in the closed portion as illustrated in FIGS. 2 and 6, the diameter of head 25a being slightly larger than the diameter of the aperture 26.

The hinges 23 disposed at the ends of the elongate slot 24 have a thickness equal to approximately onehalf the thickness of the adjacent plate portions 20 and 22. This hinge thickness is such as to maintain the two portions of the plate in generally the same plane in the unlatched position in order to give unhindered access to the opening formed by the slot 24, see FIG. 7. Each of the hinges 28 includes a relatively wide portion 30 having substantially the same width as the elongate slot 24 and a relatively narrow portion 32 defined between the inwardly directed pairs of projections 20a and 22a provided at the faced edges of the portions 20 and 22. The projections taper slightly towards the front face of the plate and have rounded corners to avoid stress concentrations. By the use of such a hinge a great degree of bending flexibility is provided while at the same time providing an accurately defined folding or pivoting zone in the portion 32 between the projections 20a and 22a such that on folding the upper portion 22 into the position shown in the FIG. 2 cooperating latching elements 25 and 26 are automatically aligned enabling a great facility in latching the closure device. The head 25a maintains the portions 20 and 22 in engagement as shown in FIG. 6 until it is desired to re-open the bag. In such a case the operation in reversed and the portions are pulled apart by aid of the handle or tab 36 fixed to the edge of the upper portion 22.

In order to have full access to the interior of the bag or sack, the portions 20 and 22 pivot or twist about the hinges 28 in a plane substantially perpendicular to the plane of the pivoting action described relative to latching. This twisting action is facilitated by the wide portion 30 of the hinge which is subject to the greatest stresses; accordingly, this construction tends to prevent a large shear stress concentration at the narrow portion 34 of the hinges which could cause severing along the folding or pivoting line.

A variation of this embodiment is shown in FIGS. 8-12 in which the closure element is provided with a guarantee strip.

Such a strip is intended to seal the elongate slot in the plate. Accordingly, the interior of the bag or sack forms a closed space and in order to have access to it the guarantee strip must be partially or completely undone thereby indicating this fact. Such an embodiment has obvious applications in the sale of retail goods.

Elements similar to those of the preceding embodiment are designated by the same numerals. As noted above, the slot between the upper and lower portions 20 and 22 is replaced by an elongate tear-away strip 40. In order to have access to the interior of the sack the tab 43 is pulled and the strip 40 is severed from the adjacent portions 20 and 22 along the lines 42 of reduced strength which are easily severed by this action. It should be noted that the tab 36 acts also as a handle before the removal of the guarantee strip.

In the cross-section of FIG. 11, the strip 40 is shown with a convex front surface and a flat rear surface in the plane of the rear surface of the plate 10. A variation of the cross-section of the tear-away strip 40 is shown in FIG. 12 in which both faces of the strip are convex which come together along lines of reduced section or strength 42'. The lower portion 22 is provided with an extension 45 with a slot therein. Such an extension enables the bag to be hung up or hooked onto an appropriate support.

The present invention is not intended to be limited by the embodiments described hereinabve but extends to all equivalents and variations with the scope of the appended claims.

Iclaim:

1. A unitary closure device for a bag comprising: a plate having a first and second portions, an elongate means adapted to provide access to the interior of the bag and disposed between the first and second plate portions, at least one latching element on one o the plate portions adapted to engage a cooperating latching element on the other of the portions for maintaining the closure device in a closed position preventing access to the elongate means, and hinge means connecting the plate portions at the ends of the elongate means for pivotably mounting said first portion relative to said second portion, said hinge means having a thickness substantially less than that of the plate, and interengaging projections on the plate portions adjacent the hinge means to align the latching elements on closing the device.

2. A closure device according to claim 1, wherein the width of the hinge means is greater adjacent to the elongate means than between pairs of projections.

3. A closure device according to claim 2, wherein the hinge means flares out from the projections to the adjacent edges of the plate.

4. A closure device according to claim 1, wherein the elongate means is an elongate slot defined between the hinges and the portions of the plate.

5. A closure device according to claim 1, wherein the elongate means comprises a tearaway strip sealingly arranged between the portions of the plate and adapted to be removed to expose an elongate slot between the hinge means and the plates.

6. A closure device according to claim 5, wherein the tear away strip includes a tab generally at one end thereof for facilitating its removal.

7. A closure device according to claim 1, wherein one of the portions of the plate is provided with means for hanging the bag.

8. A closure device according to claim 1, wherein the latching element comprises a projection with an enlarged head extending from the first portion of the plate, and the cooperating latching element comprises an aperture having a diameter slightly less than that of the head of the associated projection.

9. A closure device according to claim 1, wherein the portion of the plate adapted to be pivoted includes a tab for facilitating the unlatching of the closure device.

10. A closure device according to claim 1, wherein one face of the associated bag is adapted to be connected to the rear face of the first plate portion and to the front face of the second plate portion.

I 1'' t l UNITED STATES PATENT orrics GERTWICATE @F QQRRMITWN Patent No. 3,727,829 Dated April 17, 973

Inventms Chri s tian Huni It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet item [35] "Mazereu" should read Mazereau Signed and sealed this 26th day:;oi" February 19%..

(SEAL) Attest:

EDWARD M.FLETCHER,JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents =ORM PO-105O (10-69) uscoMM-Dc eoa'Ie-Pm it U.S. GOVERNMENT PRINTING OFFICE: 1989 0-566-334, 5

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3282493 *Aug 5, 1965Nov 1, 1966Thru Products Inc CSynthetic resinous bag construction having frangible sealing means
US3426959 *Jan 16, 1967Feb 11, 1969Jerome H LemelsonPackaging assembly
US3462068 *Jan 2, 1968Aug 19, 1969Suominen Heikki SBag and closure means
US3529317 *Oct 30, 1968Sep 22, 1970Windmoeller & HoelscherHandle of synthetic thermoplastic material for carrying bags
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4234086 *Oct 2, 1979Nov 18, 1980Dorton Howard EApparatus for handling soiled surgical sponges
US4335817 *Feb 6, 1980Jun 22, 1982Talon, Inc.Easy openable and closable bag with slide fastener
US4337889 *Feb 6, 1980Jul 6, 1982Talon, Inc.Reclosable bag with slide fastener
US4566129 *Dec 21, 1983Jan 21, 1986Mcnamee Douglas DResealable bag and tamper proof sealing ring
US4619021 *Jul 23, 1984Oct 28, 1986Johnson James RClosure strip to be applied to bags
US4715728 *Jun 24, 1987Dec 29, 1987Nicholas SfikasTamper evident multi-purpose envelope
US4740090 *May 7, 1987Apr 26, 1988Mcnamee Douglas DTamper proof bag resealable closure apparatus
US4967451 *Jun 19, 1989Nov 6, 1990Boyn Hong SFixing structure of a shopping bag handle
US4983047 *Oct 30, 1989Jan 8, 1991Netto Eduardo D L CEnvelope with closure and seal device
US5600978 *Mar 30, 1993Feb 11, 1997Elc Produtos De Seguranca E Comercio Ltda.Device for the closure of bags or the like and security seal
US5826737 *Feb 5, 1997Oct 27, 1998Colgate-Palmolive CompanyThermoformed reclosable container
US5924797 *Jan 25, 1996Jul 20, 1999Elc Produtos De Seguranca Industria E Comercio LtdaManually tearable closure seal device for envelopes
US6619479 *Jan 22, 2002Sep 16, 2003Adstracts, Inc.Promotional bag dispensing apparatus
US6821018 *May 19, 2000Nov 23, 2004Jacques DenkoFlexible container with a sealable closure
US6991375 *Feb 4, 2003Jan 31, 2006Velcro Industries B.V.Reclosable packaging
US7406810Oct 24, 2005Aug 5, 2008Velcro Industries B.V.Reclosable packaging
US8708302 *Jul 27, 2011Apr 29, 2014Stan G. WilderWall calendar holder apparatus
US8807834 *Apr 3, 2012Aug 19, 2014Cryovac, Inc.Easy open and reclosable package with panel section with easy open sealant, and reclosure mechanism
US8858077Apr 1, 2011Oct 14, 2014Velcro Industries B.V.Reclosable pouch closures and related packaging and methods
US20030228078 *Feb 4, 2003Dec 11, 2003Clune William P.Reclosable packaging
US20060062496 *Oct 24, 2005Mar 23, 2006Velcro Industries B.V., Netherland CorporationReclosable packaging
US20060269169 *May 25, 2006Nov 30, 2006Kettner Catherine EBag with tamper evidencing closure
US20110262057 *Dec 8, 2009Oct 27, 2011Wincor Nixdorf International GmbhDevice and method for closing at least one thin-walled transporting container which has at least one opening and is intended for items of value
US20130209005 *Apr 3, 2012Aug 15, 2013Cryovac, Inc.Easy Open and Reclosable Package with Panel Section with Easy Open Sealant, and Reclosure Mechanism
USD495369Nov 12, 2003Aug 31, 2004Adstracts, Inc.Clipboard
USD500082Nov 12, 2003Dec 21, 2004Adstracts, Inc.Clip
EP0053390A1 *Dec 1, 1981Jun 9, 1982Kwik Lok CorporationImproved closure strip
EP0062361A1 *Mar 6, 1980Oct 13, 1982Felix Heescher Gesellschaft mit beschränkter HaftungAttaching and guiding device for webs of foil
WO2013103292A1 *Dec 21, 2012Jul 11, 2013Van Der Windt Verpakking B.V.Assembly of a carrying device and a plurality of intermediate packaging members, carrying device, and method for packaging a product
WO2013122940A1Feb 12, 2013Aug 22, 2013Cryovac, Inc.Easy open and reclosable package with die-cut web and reclosure mechanism
WO2013122970A1Feb 13, 2013Aug 22, 2013Cryovac, Inc.Easy open and reclosable package with panel section with die-cut
WO2013122972A1Feb 13, 2013Aug 22, 2013Cryovac, Inc.Easy open and reclosable package with panel section with easy open sealant and reclosure mechanism
WO2015191504A1Jun 9, 2015Dec 17, 2015Cryovac, Inc.Easy open and reclosable gusseted package with die-cut web and reclosure mechanism
Classifications
U.S. Classification383/203, 383/28, 383/86, 383/95, 383/22, 24/30.50R
International ClassificationB65D33/16
Cooperative ClassificationB65D33/1683
European ClassificationB65D33/16G