Box with improved resistance to closure panel opening

Abstract

A box formed from a single cardboard sheet and having a closure panel from which there projects a lip insertable into the box interior between the box front panel and the edges adjacent thereto of two flaps projecting from the box side panels, the lip being separated from the closure panel by a folding line, at each end of which a cut is provided into which a flexible appendix projecting from each flap is inserted, with the free end of the flap making contact with the inner surface of the front panel in the box when closed.

1 . A box with improved resistance to closure panel opening, comprising:
 four consecutive main panels and a secondary panel which projects from the first main panel;   parallel longitudinal folding lines separating the main panels and the secondary panel from each other;   a closure panel for at least one end of the box, projecting from at least one end of one of the main panels and separated from it by a first transverse folding line about which the closure panel can rotate between an open position and respectively a closed position of said end of the box;   a lip projecting from the free end of the closure panel and separated from it by a second folding line, at each end of which a cut is provided;   at least one flap projecting from the end of at least one of those main panels different from that from which said closure panel projects in the same direction, said flap being separated from the respective panel by a transverse folding line about which the flap can rotate towards the box interior, wherein from that longitudinal edge of said flap furthest from said closure panel there projects an elongate flexible appendix the free end of which is substantially aligned with the folding line which separates that main panel from which said flap projects, from the main panel consecutive to it, said flexible appendix being positioned such as to be inserted, when the box is closed, into the cut provided in the adjacent end of said second folding line between said lip and the panel from which the lip extends.   
   
   
       2 . A box as claimed in  claim 1 , wherein the sides of said flexible appendix are defined by cuts and recesses provided in that flap of which the appendix forms part. 
   
   
       3 . A box as claimed in  claim 2 , wherein one of said recesses of the flap extends from the longitudinal edge of the flap to the folding line separating it from the main panel with which it is rigid.