US 3334805 A
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Description (OCR text may contain errors)
Aug. 8,V 1967 R. w. HALBACH 3,334,805
PLASTIC BAG CLOSURE Filed oct, 22, 1965 /A/VENTOR: ROBERT W. HALBACH,
United States Patent O 3,334,805 PLASTIC BAG CLOSURE Robert W. Halbach, 415 WCU Bldg., Quincy, Ill. 62301 Filed Oct. 22, 1965, Ser. No. 501,215 3 Claims. (Cl. 229-62) This invention relates to a plastic bag closure and particularly to a closure that is so effective in closing a plastic bag that it locks the bag closed and, in so doing, seals the closed area in an airtight and watertight lock.
Plastic bags have become popular for use to contain various products, including foods. The plastic bags have various potential advantages over paper bags which include the properties of being airtight, watertight, and strong. Also, the plastic is transparent so that its contents can -be visually examined. These potential advantages are usually lost, however, because of the absence of a satisfactory and effective closure device for the bag. If the closure is ditlicult to operate, persons will not bother to use it. If it tears the plastic, it will limit the life of the container and probably will not produce a watertight and airtight closure.
The principal object of this closure device is designed to achieve the foregoing desired results.
In general, the enclosure comprises a clip of plastic or similar material permanently attached to the plastic bag. The clip is bifurcated to provide areas with a space -between them. The clip is attached to the bag in such a way that the arms project away from the bag.
The closure is used by twisting the end of the bag, as is so often done in attempts to close a bag, and then passing the twisted portion between the prongs of the bifurcated clip to lock the bag in the twisted condition. The result of this clip is that a twisted portion remains in twisted condition because of this lock, and it is an object of the invention to provide a closure device that automatically assures that a portion of a twisted part of the bag will remain twisted after the lock is set in place. This object is accomplished because the length of the clip to its free end is such that a portion of the twisted area must be trapped between the point of attachment of the clip and the free end.
In addition to the foregoing, objects of this invention are to provide a positive and automatic closure device for a plastic bag that closes the bag in an airtight and watertight lock that is inexpensive, that is easy. to use and understand, and that does not rip the plastic bag material.
Other objects and advantages will be apparent to those skilled in the art.
In the drawing:
FIGURE l is a plan view of a bag with this closure device, showing the bag in attened condition without any contents;
FIGURE 2 is an enlarged view in section taken along the line 2 2 of FIGURE l;
FIGURE 3 is an enlarged view in section taken along the line 3 3 of FIGURE l;
FIGURE 4 is an enlarged View in section taken along the line 4-4 of FIGURE 1;
FIGURE 5 is an enlarged isometric view of the closure clip;
FIGURE 6 is a reduced scale side elevation view of the bag and closure clip, partly shown in section, showing a sample loaf of bread, before closing the bag;
FIGURE 7 is a view similar to that of FIGURE 6, but showing the intermediatestep of closing the bag wherein the end of the bag is twisted but the closure is not set in place; and
FIGURE 8 is a side elevation view similar to FIGURE 6 but showing the bag completely closed and locked.
Referring to the drawing, the bag 10 may be of any size and shape and may be made of any of the usual plastics that are employed for this purpose. This bag has `a generally sleeve-like side wall 11 closed at the bottom 12 by a suitable sealer means 13, usually a heat seal. The upper end 14 is open to permit introduction of articles into the bag 10.
A clip 16 is fastened to the side 12 of the bag 10.*The clip 16 has a base 17 and sides 18 and 19 that are separated by a central cutaway portion defining spaced parallel inner edges 20 and 21 which meet diverging edges 22 and 23 in curved intersections 24 and 25, respectively. The edges 22 and 23 intersect parallel outer side edges 26 and 27 in curved intersections 28 and 29, Irespectively. The clip 16 is preferably made of a relatively stil plastic but it may be made of other similar suitable materials which are suiciently rigid and long lasting to perform the function to be described. As FIGURE 1 shows, the clip 16 is fasterned to the side 12 near its base 17. It may .he fastened by glue or -by a suitable tape 35, or it may be bonded with heat or chemical.
The drawing shows the clip 16 attached adjacent the edge 14 of the open end of the bag 10, and this is the preferred position because it provides maximum capacity for the bag 10. However, the clip 16 may be attached at other places to perform its function now to Ibe described.
To use this bag 10, and the clip 16, the bag is filled with its intended contents. In the illustration, there is a loaf of bread 30 in the bag 10, and it is desired to close the open end 14 of the bag and to lock that end in an airtight and watertight condition until such time as the bag is opened for access to its contents. Use of the closure of this invention is very simple. The portion 31 of the bag 10 between the clip 16 and the contents 30 is twisted as shown in FIGURE 7 and as it conventionally done in efforts to close bags. Then, the clip 16 is moved into a position which will permit p-art of the twisted portion 31 to enter the space between the edges 20 and 21. Because the clip is attached adjacent its base 17 to the side 11 of the bag 10, this necessarily requires the positioning of a portion 32 of the twisted portion 31 between the edge 17 of the clip and the space between the edges 20 and 21, as shown in FIGURE 8. When the twisted portion 31 is pressed tightly between the prongs 18 and 19, this portion 32 remains twisted and cannot become untwisted because it is locked between the spaced parts of the clip 16. FIGURE 8 also shows a portion of the bag twisted below the clip 16. This part may automatically un-roll when the clip 16 is freed. That is what happens to conventional bags when they are twisted. However, the portion 32 is locked in the twisted condition, and the bag is therefore closed in an airtight and watertight condition.
'Ihe converging edges 22 and 23 are yfeatures of the invention because they provide a wide entry for the twisted part of the bag 30 into the space Kbetween the prongs 18 and 19. The curved ends 28 and 29 prevent puncturing of the bag 10. The edges 22 and 23 meet the edges 20 and 21 in smooth converging edges 24 and 25 to guide the twisted portion of the bag into the locking area between the edges 20 and 21 without puncturing the bag.
To gain access to the bread 30, the clip 16 is simply pulled free of the twisted portion 31 and the bag is opened. It can be closed thereafter by twisting again and replacing the clip 16. Since the clip does not puncture the bag or tear the bag, it may be used many times. Because the clip is attached near its base 17, it is impossible to fail to trap a twisted portion 30= of the bag to get the desired lock.
Various changes and modications may be made within the purview of this invention aswillwbe readily apparent to those skilled in the art. Such changes and modiications are within the scope and teaching of this invention as defined -by the claims appended thereto.
What is claimed is:
1. A -bag of flexible twistable material having an open end, and a clip for closing the open end, the clip cornprising a relatively rigid member having parts dening a space for receiving and releasably locking therebetween a twisted portion of the bag, the clip being attached to the side of the bag thereby enabling locking of a twisted portion of the bag between the place on the bag of attachment of the clip to the bag and the place on the bag received within the space of the clip.
2. The combination of claim 1 wherein the clip is attached to the side of the bag adjacent the base of the clip located remotely opposite the said space.
3. The clip of claim 1- wherein the space of the clip is defined by opposing generally parallel edges with a divergent entrance to the space between the parallel edges.
References Cited UNITED STATES PATENTS 2,973,131 2/1961 Mead et al. 229--66 3,164,249 l/ 1965 Paxton 206-56 3,233,821 2/1966 Ehlers I229--66 FOREIGN PATENTS 571,439 3/ 1959 Canada.
JOSEPH R. LECLAIR,v Primary Examiner. D. M. BOCKENEK, Assistant Examiner.