Container opening device
BACKGROUND OF THE INVENTION 
     The well-known method of packaging liquid products, such as milk, fruit juices, and others, is to use parallelepipedic leak-proof containers formed by folding and pasting a sheet of a non-rigid material, such as waterproofed cardboard. 
     The upper part of these parallelepipedic containers is made of the ridge obtained by pasting together the edge of the larger opposite surfaces, and by two small beaks or horns folded against the two smaller surfaces when storing the container. 
     A container such as these can be opened by clipping one of the beaks with scissors or any similar instrument, after this beak has been pulled up. 
     The users are well aware that, notwithstanding their indisputable advantages, these containers present significant drawbacks: they are often difficult to open; the hand pressure on the container sides for opening, handling, and pouring may cause accidental spilling through the clipped beak, and therefore a loss of product; the product may deteriorate by oxidization or may take a bad taste when stored in a refrigerator with strong smelling food (e.g., some processed meat, cantaloupe, etc.). 
     These disadvantages create, in fact, three problems related to the opening, handling and closing of the container between pourings. 
     Previous attempts to solve these problems were never quite complete nor perfect. 
     Such is the case of the West German patent DE-A-2932886 which describes some kind of elastic pincers used to provide the tearing of the beak, and also the reclosing of the container; but theoretically, the reclosing is problematic. 
     Anyhow, even with the use of this pincer, the container must still be held directly by hand for the opening, closing and pouring operations, which is the cause of the undesired gushing due to the pressure of the fingers. 
     The device disclosed by West German patent DE-A-3019745 is much better in the sense that a frame with a handle is provided to lodge the container; a cross-cutting device for clipping the tip and the pulled up beak is supported by a stirrup articulated on the frame. 
     Although this last patent seems to solve the problem of spilling liquid when handling and opening the container, it provides no solution for insuring an airtight closure of said container. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a simple device which satisfactorily alleviates the above-mentioned three problems. 
     The device of the invention is characterized by the fact that it includes a stiff frame for receiving and holding a non-rigid container, adapted to the shape of the container; this removable frame, formed to fit the container, is combined with cutting means for clipping the spout when it is unfolded; these cutting means are suitably dimensioned and shaped so that they can also be used after the cutting operation to insure temporary sealing of the spout between pourings of the liquid. 
     According to a preferred approach, the airtight closing of the spout is obtained by bringing together the lips of the spout, and pinching them together under pressure. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     Other features and advantages of the invention will be apparent from reading the following description and claims, set forth in conjunction with the accompanying drawings: 
     FIG. 1 is a perspective view of a typical container concerned by the invention; 
     FIG. 2 is a view of the same container with the beak pulled up; 
     FIG. 3 shows a first method of implementing the invention; 
     FIG. 4 is a top view of this first design; 
     FIG. 5 shows a second method of implementation; 
     FIG. 6 is a top view of this second design; 
     FIGS. 7, 8 and 9 are views of the slider body; 
     FIG. 10 is an inside view of the frame; and 
     FIGS. 11 and 12 are views of details. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As shown in FIGS. 1 and 2, the typical parallelepipedic container of this invention is a prismatic tube 1 made from a sheet of waterproofed, grooved cardboard. After the container is filled, tube 1 is closed by pasting together into a ridge 1a the edges limiting the two half parts 1c and 1d of the top surface, and extending to the lateral beaks 1e and 1f. One of the beaks, for example 1f which will serve as the spout, is marked with a dotted line 1g to show the place where a manual cut is usually performed. 
     When the container is in storage, the beaks 1e and 1f are folded against the smaller sides of the parallelepiped, and the ridge 1a is turned down against the top surface. To open the container in the conventional manner, such as cutting with scissors along the dotted line 1g, the ridge 1a is turned up, and the beak 1f is pulled up in the position shown on FIG. 2. Since the other beak 1e remains folded, the ridge 1a assumes a position more or less slanted as the beak 1f is more or less pulled up. 
     According to this invention, the frame 2 (FIG. 3), shaped and dimensioned to house the container 1, is provided on top with a carriage-like cutting element 3 which can be moved in the vertical plane of the ridge 1a (in up position). The frame is sufficiently stiff or rigid to serve as a support structure to be gripped to lift the container. The cutting carriage can be a slider with a blade 3a, as shown on FIGS. 4 and 12. This slider or carriage could be a conventional device with wheel and circular blade, such as the type described in Belgium Pat. No. 679,031, or a shear-like element as in U.S. Pat. No. 2,263,353. 
     Whatever it may be, the cutting element must be able to move longitudinally in the plane of ridge 1a, from one beak (or near) to the other. For this purpose, slider 3 is supported by a guide 4 placed above the ridge 1a in such a manner that in the translation of the slider, the cutting element--either the above-mentioned blade 3a or another--penetrate the ridge 1a slantwise, as for example, along the dotted line 1g. 
     This result may be obtained by tilting the guide 4 on the horizontal plane, as illustrated in FIG. 3, in such a manner that preferably only the beak 1f will be cut. 
     According to the invention, a closing device is incorporated with the cutting element in order to insure re-closure of the beak after it has been open. 
     It is desirable to construct this guide 4 in two parts 4a-4b, jointed on top of each other as in a pincer. 
     FIGS. 5 and 6 illustrate this design. The guide 4 is composed of two jaws 4a and 4b intended to clamp together the lips of the ridge 1a. They can pivot on a rotating axis 4e/4f, located near the part of the frame opposite the beak to be clipped, by means of two inside bevels facing each other, 4c-4d. 
     The axis of rotation is made of a stud 4e integral with 4a, which lodges in a larger housing 4f provided into 4b. 
     Each back part of jaws 4a and 4b features an outside bevel 4a1 and 4b1. 
     Each jaw has an inverted L-shaped section. The front end of jaw 4a has a superthickness 4g, as seen in FIG. 11. 
     As shown in FIGS. 7, 8, 9 and 12, the slider 3 is preferably constructed of two parts which are fastened to each other after insertion of the blade 3a: the body 3b, and the cover 3c (FIGS. 4 and 6). 
     The body 3b is designed not only to slide on jaws 4a and 4b of the pincer (for this purpose, the body features a groove 3d with an L section flared towards the front 3e, and with parallel sides towards the rear end 3f under the bridge 3g), but also to produce the opening-closing motion of these jaws. 
     As seen in FIG. 11, the transversal L section of this groove 3d features (in the flared part and on one side only) a thinning down of the lip 3h. This partial reduction of the lip permits to provide an adequate inside abutment 3i which stops the superthickness 4g to limit the translation of the slider 3. 
     It is easy to understand that when the slider is in its farthest position, it rides the narrowest part of the jaws (because of the outside bevels) with a certain lateral clearance. Whereas when the slider moves forward in the opposite direction, its rectilinear portion 3f (the narrowest of the groove) which is barely wider than the pincers total width, closes the jaws together. 
     The forward motion of the slider, restrained by the jaws, has the effect of applying tension on the two separate parts 2a-2b which form the back of the frame, since each of these parts is integral with a jaw 4a or 4b, and that said jaws were originally shaped in the open position. Accessorily, the ring 5 which permits to hold the frame 2, and which is open, and which has each end inserted in a small cavity on the side of the jaws, contribute to their opening.