Box made of paper material with a lid and blank for making a box made of paper material with a lid

Abstract

A box made of paper material with a lid including a containment body having a base wall, a plurality of containment side walls, an access opening defining a containment space, a lid including a top wall and a plurality of lid side walls. At two non-adjacent containment side walls first portions of a retention device are present and two non-adjacent lid side walls having second portions of the retention device. When the lid is closed, each first portion and respective second portion of the retention device are commutable between a stable mutually engaged condition and an unstable mutually disengaged condition, wherein the stable mutual engagement condition is obtained by interference between each first portion and the respective second portion of the retention device. A rib is placed inside the containment space and placed between the base wall and the access opening.

1 . A box made of paper material with a lid, comprising:
 a containment body having a base wall of polygonal shape and a plurality of containment side walls extending substantially parallel to each other from the base wall up to an access opening for the containment body and defining, in combination with the base wall, a containment space;   the lid comprising a top wall and a plurality of lid side walls;   wherein first portions of a retention device are provided at two non-adjacent containment side walls and wherein two non-adjacent lid side walls comprise second portions of said retention device;   wherein when the lid is closed on the containment body, each first portion of the retention device and the respective second portion of the retention device are commutable between a stable mutually engaged condition in which they oppose the opening of the lid and an unstable mutually disengaged condition in which they allow the opening of the lid;   wherein the stable mutual engagement condition is obtained by interference between each first portion of the retention device and the respective second portion of the retention device;   said containment body further comprising a rib placed inside said containment space, connected to said containment side walls and placed between the base wall and the access opening.   
     
     
         2 . The box according to  claim 1 , wherein said lid is hinged to one of said containment side walls interposed between the containment side walls on which the first portions of the retention device are active. 
     
     
         3 . The box according to  claim 1 , wherein said rib is placed closer to the access opening with respect to the base wall. 
     
     
         4 . The box according to  claim 1 , wherein said rib comprises a frame connected to said containment side walls and a central door at least partially separable from said frame. 
     
     
         5 . The box according to  claim 4 , wherein said central door is connected to said frame through predefined separation lines to achieve a controlled and predefined separation of the central door from the frame. 
     
     
         6 . The box according to  claim 4 , wherein said central door is smaller than said access opening. 
     
     
         7 . The box according to  claim 1 , wherein each first portion of the retention device and the respective second portion of the retention device interfere with each other to define the stable mutual engagement condition at respective interference zones (Z 1 ) provided at a first distance (D 1 ) from said access opening and interposed between the base wall and the access opening; said rib being provided at a second distance (D 2 ) from said access opening, wherein said second distance (D 2 ) is less than three times said first distance (D 1 ), preferably less than twice said first distance (D 1 ), even more preferably less than said first distance (D 1 ). 
     
     
         8 . The box according to  claim 1 , wherein said first portions of the retention device extend from containment side walls adjacent to a containment side wall to which said lid is hinged. 
     
     
         9 . The box according to  claim 1 , wherein each first portion of the retention device comprises an appendage projecting externally from the containment space at a containment side wall and wherein each second portion of the retention device comprises a shoulder on a lid side wall on the side facing the containment space. 
     
     
         10 . The box according to  claim 9 , wherein each appendage extends from a free edge of a respective containment side wall and wherein each shoulder is obtained from a turned-up portion of a lid side wall. 
     
     
         11 . The box according to  claim 9 , wherein each appendage comprises an abutment edge configured to engage said shoulder and a manoeuvring portion for a user configured to disengage the abutment edge from said shoulder. 
     
     
         12 . The box according to  claim 1 , wherein said retention device comprises third portions and fourth portions operating on a containment side wall and a lid side wall, respectively; said third portions and said fourth portions of the retention device being commutable between a mutually engaged condition in which they oppose the opening of the lid and a mutually disengaged condition in which they allow opening the lid. 
     
     
         13 . The box according to  claim 12 , wherein said third portions of the retention device operate on a different containment side wall than the containment side walls on which the first portions of the retention device operate, and said fourth portions of the retention device are placed on a different lid side wall than the lid side walls on which the second portions of the retention device are obtained. 
     
     
         14 . The box according to  claim 12 , wherein said third portions of the retention device operate on a containment side wall opposite the containment side wall hinged to the lid. 
     
     
         15 . The box according to  claim 12 , wherein each third portion of the retention device comprises a flap projecting externally to the containment space from a containment side wall and wherein each fourth portion of the retention device comprises a shoulder on a lid side wall on the side facing the containment space. 
     
     
         16 . The box according to  claim 15 , wherein each flap comprises an abutment edge configured to engage said shoulder. 
     
     
         17 . The box according to  claim 1 , wherein said box is made entirely of paper material starting from a flat blank. 
     
     
         18 . A flat blank for making a box with lid comprising:
 a first panel, a second panel and a third panel adjacent to the first panel and placed on opposite sides with respect to the first panel;   a fourth panel adjacent to the third panel on the opposite side with respect to the first panel;   a fifth panel and a sixth panel adjacent to the first panel and placed on opposite sides with respect to the first panel;   wherein the first panel realizes a base wall of a containment body, the second panel, the third panel, the fifth panel and the sixth panel realize containment side walls of the containment body and wherein the fourth panel defines a rib placed inside the containment body;   wherein the fifth panel and the sixth panel comprise respective first appendages defining first portions of a retention device configured to cooperate with second portions of the retention device placed on a lid to hold said lid closed on the containment body.   
     
     
         19 . The blank according to  claim 18 , comprising a seventh panel adjacent to the second panel on the opposite side with respect to the first panel, wherein the seventh panel realizes said lid and wherein the seventh panel comprises appendages defining said second portions of the retention device. 
     
     
         20 . The blank according to  claim 18 , wherein the fourth panel comprises a central door and a frame connected by a separation line. 
     
     
         21 . The blank according to  claim 18 , wherein the fourth panel comprises at least one edging configured to be joined to the second panel, the fifth panel and the sixth panel, respectively, to hold said rib in place.