Stackable packing box lid - has diagonal and transverse reinforcement ribs and studs at flanged corners with closing hooks

摘要

The lid, which is rectangular to fit the packing box, has reinforcing ribs (55) which run diagonally across the under side to form a grid. A central reinforcing rib (53) runs across the lid and short reinforcing ribs (54) strengthen the main frame of the lid. The corners are equipped with studs (52) and the edges of the lid are flanged at the corners (51) with a lower hook (50) to close the lid. The depth of the studs is the same as the depth of the ribs so that the lid is stackable and reversible.