Abstract:
A stackable carton with a V-shape over center hinged pour spout formed in one wall of the carton is provided. The V-shaped pour spout when pulled in the open position forms a funnel for dispensing the contents of the carton. On closing the pour spout, a three pivot construction, by toggle action, reseals the carton and protects its contents.

Description:
BACKGROUND OF THE INVENTION 
     1. Field 
     Pour spout carton. 
     2. Prior Art 
     There are numerous examples of pour spout cartons in the prior art. For example, in U.S. Pat. No. 3,672,557 to Krzyzanowski there is described a carton and a blank therefor where one entire wall is constructed of two panels hinged together on a central or axial fold line to form a V-shaped infolded carton wall having a transverse fold line about which a portion of the wall can be hinged to form a pour spout construction. 
     The patent to Ryder, U.S. Pat. No. 2,842,302, discloses a pour spout construction in one edge and part of a front and side wall form a pouring spout carton. 
     The patent to Kuchenbecker, U.S. Pat. No. 3,172,594, illustrates an example of the so-called &#34;gable top&#34; pour spout carton or container. 
     The patents to Ignell, U.S. Pat. No. 3,083,890; Francis, U.S. Pat. No. 3,367,553; Benezra, U.S. Pat. No. 3,524,578; Brown, U.S. Pat. No. 3,869,078; Reil, U.S. Pat. No. 3,797,726; and Gill, U.S. Pat. No. 3,549,080 are further illustrations of the variety of cartons with pour spouts which have been provided in the prior art and which have not met with full acceptability, nor have they overcome the fundamental problems of forming an effective reclosable pour spout in a container. 
     SUMMARY OF THE INVENTION 
     The object of the carton of this invention is to provide a good working pouring spout carton which requires only slight modification of standard filling and shipping equipment. The specific form of pour spout construction provided by this invention permits close to perfect resealing to protect the contents once the sealed package has been opened by a user. 
     Briefly, the pour spout is formed in one of the walls of the carton by a three pivot construction with flexible members therebetween. It is desirable to provide a handle on the center of the three pivot points to permit the user to pull the pour spout open to form a funnel for dispensing the contents of the container and to reclose the pour spout by pushing in on the handle and thereby effectively resealing the carton. Additional features are an outside sealing flap and a pair of mechanical sealing flaps which overlie the top edges of the V-shaped pouring spout when it is in its closed position. 
     The particular construction and the mechanics of the pour spout carton of this invention are fundamentally different from those illustrated in the prior art as referred to above. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 illustrates, in perspective, the pour spout carton of this invention in its open position dispensing the contents of the package; 
     FIG. 2 is an illustration of the opened carton of this invention which has been resealed by inward movement of the V-shaped pouring spout construction; 
     FIG. 3 shows in solid lines the blank which is formed for the purpose of making the carton of this invention and in phantom lines illustrates the adjacent blanks showing one way in which the carton of this invention could be manufactured by die cutting and crease line formation from a moving web of material; 
     FIG. 4 shows a plurality of the cartons of this invention stacked as they would be stacked in preparation for shipment to a customer who is then to fill them with the contents; 
     FIG. 5a is an illustration in perspective of filling the carton of this invention from the top after the bottom portions have been sealed and prior to sealing the top portion; 
     FIG. 5b is a figure similar to 5a, except that it shows the top portions of the carton of this invention having been sealed and the carton is being filled from the bottom; 
     FIG. 6 is a perspective illustration of the complete cartons of this invention on a conveyor being transported to cartoning equipment for shipment to stores and the like; 
     FIG. 7a is a perspective view, broken away, of the carton of this invention illustrating the details of construction when the pour spout is in its open position; 
     FIG. 7b is a view similar to FIG. 7a, except that it illustrates the carton of this invention with the pour spout in the closed position; and 
     FIG. 8 is a detailed view of the mechanics of the pour spout construction of this invention illustrating in solid lines the pour spout in its open position and in dotted lines partially closed position and fully closed positions. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The carton of this invention is illustrated generally at 10 and is comprised of wall panel 12, top 14 having a sealing flap 16, wall panels 18 having a pour spout indicated generally at 20, the details of the construction of which will be explained below. As shown in FIG. 1, i.e. at the time the carton is dispensing its contents, indicated generally at 22, the mechanical sealing flaps 24 overlie the outer edges of the pour spout 20. The sift proof sealing bottom flaps 26 are illustrated in FIGS. 1 and 2. The details of that construction will be described below, but are of standard form and need not be described in great detail other than to explain that they are the customary siftproof bottom flaps of cartons known in the art. 
     FIG. 2 illustrates the carton illustrated in FIG. 1 except that the pour spout 20 is in its closed position as indicated by the dotted lines. It is noted that the mechanical sealing flaps 24 are scored at their joinder to top portion 15 in the known manner to overlie the top of the pour spout 20 and therefore provide a good mechanical seal over the edges of the pour spout. 
     In order to understand how the carton as illustrated in FIGS. 1 and 2 is formed, reference should be made to FIG. 3. In the solid lines, a completed blank 30 is shown prior to the formation of the blank 30 into a carton such as is illustrated in 10. It will be noted that the die cut wall panels 12 and 13 are provided at their respective top edges with the top sealing panel 14 and its underlying top portion 15 along with a sealing flap 32 for the side of the carton opposite the pour spout 20. It is to be noted that the pour spout 20 will be formed when the blank 30 is glued along its longitudinal edges from the spout elements 34 and 36 which are formed with line hinges 38, 40 as well as a line hinge 42 between gluing flap 44 and spout element 34. Also, it is to be noted that there is a scored cut-out tab 46 formed in gluing flap 44 which will form the handle for the pour spout 20 as will be described below. Scored fold lines 48, 50, 52 and 54 mark the corners that separate the wall panel 18 and gluing flap 19 from wall panels 12, 13. The panel wall 56 has a fold line 58 which performs a very important function in permitting the box blank 30, when panel 18 and flap 19 are glued together along with a corresponding portion of the glue flap 44 to portion 36, to be shipped in a flattened condition. 
     While not illustrated specifically it is to be noted that the preceding blank and the succeeding blank as illustrated in phantom lines in FIG. 3 have identical fold lines and are cut or scored in exactly the same way. 
     In order to complete the bottom of the carton 10 there is a seal flap 60, a separate outer seal flap 62 which has the edge sealing flaps 26 formed at the bottom of the front and back portions 12, 13 with a fold line 64 passing completely across the blank 30. Also, there is a top fold line 66 which permits the folding of the members 14, 15 over their associated flaps 69 which forms the portion of the top seal opposite the position of the pour spout 20. At the bottom portion, or course, there are sealing flap portions 68 which complete the sift-proof bottom closure of the carton 10. 
     After the blank 30 has been formed as illustrated in FIG. 3, the panels 18 and 19 are glued together with the side 18 overlying side 19 and the glue flap 44 being glued to and joined to its opposite portion 36 with the single exception of the area which underlies the scored section 46 which is not glued in order to leave the tab 46 without its being glued down. 
     Following the gluing operation between panels 18, 19 and the pour spout elements 34, 36, 44, the carton blanks 30 are formed into flattened members which are ready for filling and sealing in standard machinery. At this point it will be noted that, despite the fact that when glued together the dimensions of the pour spout 20 is such that it will either remain in the open or closed position and the top dimension is greater than the width of the panels 18, 19, since there is the fold line 58 in the opposite panel this permits the boxes to be shipped in a flattened condition and take up the minimum amount of space for shipment to be filled and sealed. 
     In FIG. 4 the fully prepared cartons 70 are shown in their stacked condition for shipment. 
     FIGS. 5a and 5b illustrate the two ways of completing one end of the carton 10 for filling. Specifically in FIG. 5a it shows that the bottom elements 60, 62, 68 and the seal flaps 26 have been sealed in position and the carton of this invention is illustrated as being filled from the top. 
     Similarly, in FIG. 5b the top elements 14, 15, 16 and the associated flaps 69 are shown as having been sealed and the bottom elements 60, 62, 68 and 26 are still open and the carton 10 is being filled from the bottom. 
     FIG. 6 is an illustration in perspective showing that completed cartons have been filled and have been sealed and are being passed to cartoning equipment for shipment to the stores and the like. It should be noted at this point that cartons 72 are completely stackable and have none of the disadvantages of storing or occupying excess space as is characteristic with the typical &#34;gable top&#34; type containers as illustrated in the prior art referred to above. 
     Turning now to FIG. 7a, it will be noted that the sealing flap 16 and its associated top portion 14 have been pulled out of sealing relationship with the element 15 for the purpose of more fully illustrating the pour spout construction 20 and its associated mechanical seal elements 24. 
     In FIG. 7a the pour spout 20 is shown in the open position showing that the pour spout 20 is formed from flap 36 with its associated line hinge 40, from the flap 34 with its associated line hinge 42 and glue flap element 44 which overlies and is glued to flap 36 adjacent line hinge 42. The pull handle 46 has been pulled out into the open position and is the way in which the elements 34, 36 are pushed into closed position or pulled into open position. 
     In FIG. 7b the same general arrangement of parts is illustrated as in 7a except in this instance the mechanical seal flaps 24 which overlie the corners of the opening formed by opening pour spout 20 are now folded down over the tops of the elements 34, 36 in the known manner to mechanically seal the top 15 with the top portions of elements 34, 36. Again, the associated elements 16 and 14 are shown out of their normal position for better illustration of the pour spout construction 20. 
     FIG. 8 shows in solid lines the position of the respective portions of the pour spout and the front and back walls of the carton 10 without the sealing flap 16 or its associated top cover element 14 in position. Since elements 34 and 36 and glue flap 44 take up more than is provided in the triangular area formed by line hinges 38 and 40, and since the elements are relatively flexible even in the area of their overlap of the glue flap 42, they, as shown in the intermediate position in dotted lines illustrated generally at 80, tend to flex, thus permitting the construction to be pushed toward their closed position shown at 82, again in dotted lines. This over-center toggle type of action permits a positive resealing and opening of the general pour spout construction 20 and is uniquely different from anything disclosed in the prior art. 
     While the pour spout 20 has been illustrated generally at the top of one side wall of the carton 10, it will be appreciated that the position of the elements constituting the V-shaped pour spout could be almost any place along the side or front wall of the carton or could be at the bottom of the side wall rather than at the top. The basic elements of the construction of the pour spout being the three pivot point, flexible portions of the generally V-shaped pour spout and the overcenter toggle action thereby permitted. 
     While the invention has been described generally in connection with a specific preferred embodiment, it will be appreciated by those skilled in the art that there are other modifications which could made which fall within the scope of the appended claims.