Patent Document

BACKGROUND OF THE INVENTION 
     The invention concerns a tool formed as an auxiliary tool for the manual folding of a package blank in order to prepare a box shaped package. Accordingly, the invention also provides a package blank, a method for the preparation of a package and the use of a tool in order to prepare a package by folding a package blank. 
     DESCRIPTION OF THE RELATED ART 
     In the manual folding of package blanks, especially in order to prepare box shaped packages designed with a reinforced protective zone in the ends and bottom and/or top of the package, respectively, an additional number of folds are performed along fold lines in order to prepare a raised or lowered area inside of a rim extending around the perimeter of the package and comprising doubled material. During the folding operation there is a need to temporarily fix the package blank in an attained folded position. 
     A tool for this purpose must allow simple holding and simple unfastening of the package blank. The invention aims at fulfilling this requirement, and, in additional aspect, also a requirement for facilitated insertion of products during the completion of the package. 
     BRIEF SUMMARY OF THE INVENTION 
     Briefly, the tool according to the invention is characterized by means that can be activated to temporarily clamp the package blank against a work surface, and means that can be activated to support part of the package blank in a position erected from the work surface. 
     In the shown implementation, the tool is designed with a bottom plate having a support wall or abutment erect from the front edge of the bottom plate, a tongue protruding in front of the support wall from the front edge of the bottom plate, and a jaw acting from above against the tongue, as well as a spring loaded and back-springing lip protruding in front of the support wall and retractable against the spring force in dependence of the fact that during folding a part of a package blank is made to pass by the lip, and then springs back to support the package blank in the attained folded position. 
     The characterizing features of the package blank provided by the invention, the method, and the inventive use of the tool will become apparent from the below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described in more detail below with reference to the enclosed drawings, wherein 
         FIG. 1  shows the tool in a lateral elevation view; 
         FIG. 2  shows the tool in a top elevation view; 
         FIG. 3  shows the tool in a rear elevation view; 
         FIG. 4  shows the tool in an oblique bottom/rear perspective view; 
         FIG. 5  shows the tool according to the invention in an oblique top/front perspective view; 
         FIGS. 6   a - 6   d  show different operations for folding the package blank in order to prepare a package having a reinforced end zone, utilizing the tool according to the invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIG. 6   a , a package blank is shown wherein slits and fold lines have been introduced in a planar initial format for folding the blank into a box shaped package. Thus, the package blank comprises three or more parallel fold lines A defining the lateral walls I of the package and forming the corner edges of the completed package when the package blank has been folded into a box shaped package. In at least one, and preferably both ends of the package blank, two parallel fold lines B and C extend perpendicularly to said first lines. Of these latter fold lines, the inner fold line B forms the end edges of the completed package. The outer fold line C, extending over a single lateral wall and outside of said wall passing into slits S, forms the connection of the end wall T, U to the peripheral rim R of doubled material formed by folding the blank along the fold line B. In this manner, a package having a protective zone in its ends is formed, whereby the end walls obtains a retracted position between extended lateral walls with a shock absorbing end zone made from doubled material. In order to fully understand the design of the completed package, reference is made to the series of pictures in  FIGS. 6   a - 6   d.    
     Referring to  FIGS. 1-4 , a tool according to the invention is shown, designed as an auxiliary tool for manually folding a package blank, and typically a package blank of the type described above. 
     The tool  1  comprises a bottom plate  2 , having on one of its, henceforth considered front edges an erect abutment  3 , in the embodiment shown formed as a support wall  3  extending substantially vertically erect. From the front edge of the bottom plate  2  a tongue  4  projects in front of the support wall/abutment  3 . Through an opening  5 , formed in the abutment or support wall  3  and in the embodiment shown delimited by the front edge of the bottom plate, a jaw  6  extends through the support wall and out above the tongue. The jaw  6  is movably arranged and can be activated for temporary clamping of the protective zone of the package blank in the gap between the tongue  4  and the jaw. For this purpose, the jaw is suitably supported in the tip of a leg  7  mounted on the bottom plate and extending through the opening  5 . The jaw  6  and the leg  7  may advantageously form parts of a pair of grab tongs or a welding gun mounted on the bottom plate, e.g. by welding or bolts. Preferably, the leg is provided with a release mechanism for single handed activation of a kind known per se from commercially available grab tongs, such as the grab tongs manufactured by Danish company Scangrip A/S. 
     A lip  8  is arranged in the support wall  3  and movable between a position protruding in front of the support wall and a position retracted inside of or into the support wall. The lip is biased to the protruding position by a spring means  9  and retractable against the action of the spring means as a function of the fact that a part of the package blank during a fold operation is made to pass the lip. The protruding part of the lip  8  is delimited on one side by an edge  10  that is tilted in relation to the support wall  3  and, in the tip of the lip, transforms into an edge  11  that is substantially perpendicular to the support wall and forms the other side of the lip  8 . Since part of the package blank is erected from the support in one fold operation, by folding along a fold line A, and is made to pass substantially parallel to the support wall in the direction of said tilted edge, the lip is pushed away by the package blank passing the lip and then held in the erect position, supported against the perpendicularly upright edge of the lip, now springing back and protruding. 
     The bottom plate  2 , tongue  4 , and vertical support wall  3  of the tool can be prepared in one continuous piece, e.g. a steel plate, whereby the front edge of the bottom plate is made by a bending line between the bottom plate  2  and the support wall  3 , and the tongue  4  is integrally formed by an opening  5  cut out in the support wall. The lip  8  and the spring means  9  are suitably arranged on the underside of an upper end area  12  of the support wall  3 , bent backwards. In  FIG. 2 , a broken line illustrates the spring means  9  in the form of a torsion spring, pin spring or leaf spring  9 , pre-stressing and thereby loading an arm mounted pivotably at P and formed with the lip  8  in the opposite end. In this connection it is to be noted that the tool shown may be arranged for simple switching between left hand position and right hand position, by alternative mounting positions P, P′ for the lip  8  and the spring  9 , and double slits for penetration of the lip  8  through the support wall  3  (as illustrated in  FIG. 2 ). 
     Reference is now made to  FIG. 5  and  FIGS. 6   a - 6   d  for the use and function of the tool. 
     In a first operation for the completion of a box shaped package, the package blank is folded in accordance with  FIG. 6   a  in the inner fold line B extending transversally over the width of the package blank. The protective zone thus folded in double is inserted against the abutment or support wall  3  into the gap between the jaw  6  and the tongue  4 , whereafter the jaw is activated to hold the protective zone of the package blank by clamping against the tongue  4  in the direction of the arrow L in  FIG. 6   a . In this first support position, illustrated in  FIG. 5  with the package blank shown in a broken single dot line, the package blank is held in order to facilitate the other operations during folding, such as the subsequent folds in the opposite end of the package blank. 
     In this connection it is to be pointed out that the jaw  6  preferably has a length protruding outside of the support wall and adapted to the distance between the fold lines B and C, and forming the height of the protective zone of doubled material. It is further proposed that the tongue  4  should comprise a mark, e.g. in the form of a slit  13  in the longitudinal direction of the tongue, towards which mark a fold line A can be oriented when the package blank is inserted into the tool for supporting contact against the abutment/support wall  3 . 
     In the next operation, the end walls T, U of the package are erected by folding along fold lines C. The free-cut extensions X, V of the end walls are thereafter folded inwards in the direction of the respective fold lines A, forming the corners of the package, in the direction of the axial center of the package blank. After that folding, the extensions X, V of the end walls will extend supportively inside of and adjacent opposite lateral walls of the completed package. With this operation, the package blank has adopted the position shown in  FIG. 6   b.    
     Thereafter, a fold along a fold line A is performed to erect the lateral wall or walls positioned outside of the tool grip on the farthermost side of the tool, viewed from the position of the operator. This fold is performed so that the doubled rim, and more specifically that part thereof which forms an extension of the lateral wall connecting in said fold line A to the lateral wall held by the tool, during the erection operation passes the lip  8  and is thereby held in the upright position as shown in  FIG. 6   c . In  FIG. 5 , this second support position is illustrated with the package blank shown in a double dot broken line. 
     In this second support position, in which the tool aided by the lip  8  temporarily fixes the package blank in an open condition with the future “lid” in an upright position, products can easily be put into the package. The erect sections of the package blank, prevented by the lip  8  from falling back onto the work surface, in turn lock the in-folded extensions of the end walls T, U, whereby these, too, are locked in their erect positions. Thereby, the operator has both hands free for the insertion of products into a receiving space delimited on three sides by the end walls and the farthermost lateral wall, before the package blank is closed in order to form a package enclosing the products. 
     In a final folding operation along the remaining fold lines A, the erect upright wall, referred to as “lid” in the above paragraph, is lowered and the lateral wall closest to the operator is erected to close the package in accordance with  FIG. 6   d . The completely folded package may thereafter be detached from the tool by activating the release mechanism of the jaw. 
     The primary function of the tool is to form a “third hand” aiding the operator by temporarily fixing an attained folding position while both hands of the operator are busy performing the next folding operation of filling the package with products. Therefore, the tool is preferably utilized standing freely on a work table or on a conveyor belt in a production line in order enable the operator or operators in the line to handle the package blank freely for folding or insertion of products, but may alternatively be fixed on the work table, or integrated into this table by having the bottom plate fitted into the table surface or forming part of said surface. The shown embodiment of the tool is adapted for, and described as utilized in, the folding of a package blank designed to prepare a package having reinforced end zones, said package blank comprising parallel fold lines A along which the blank can be folded to form the lateral walls I of the package, fold lines B, C transversal to fold lines A along which the blank is foldable (B) to form a peripheral protective zone R of double folded material in the ends of the package, and foldable (C) to form the end walls T, U of the package with associated, free-cut extensions V, X, respectively. In this implementation, the tool thus comprises means  4 ,  6  which can be activated for engagement with the protective zone R for temporary clamping of the package blank against a work surface, as well as means  8  which can be activated in order to support a part of the package blank in a position erected from the work surface during the insertion of products into the package. The fact that the tool has been described in this implementation does not, obviously, exclude the utilization of the tool, where appropriate, with or without expertly constructive modifications, for the manual folding of other types of package blanks.

Technology Category: 7