Patent ID: 9227753
Filing Date: 2016-01-05
CPC Classification: B65D

Claim Text:
1. A locking device for locking first and second panels together, the locking device comprising a first part and a second part, the first part comprising an edge flap hingedly connected to the first panel along a first fold line and an aperture defined at least in the edge flap by a cutline which is tiered in shape, the cutline including a first cutline section and a pair of second cutline sections, the first cutline section defining a recess portion of the aperture, the second cutline sections being disposed on opposite sides of the recess portion and defining engaging portions of the edge flap, the second cutline sections being disposed closer to the first fold line than the first cutline section, the second part comprising a projection extending to a second fold line from a free edge of the second panel and a foldable tab hingedly connected to the projection along the second fold line, the foldable tab having a free end edge opposing the second fold line, the free end edge being stepped in shape and including a first step portion and a pair of second step portions, the first step portion defining a tongue of the foldable tab, the second step portions being disposed on opposite sides of the tongue and defining shoulders of the foldable tab, the second step portions being disposed closer to the second fold line than the first step portion, the foldable tab being folded about the second fold line to take a folded position, the second part being received in the aperture with the foldable tab in the folded position, the second part assumes a locking position when in the aperture in which the tongue of the foldable tab is received at least in part in the recess portion of the aperture to cause the shoulders of the foldable tab to engage with the engaging portions of the edge flap.