Foldable box for packaging of an electric lamp

The combination of

• an electric lamp (20) having a bulbous portion (20b), a base portion (20a) and a connection terminal portion (21) extending from the:
• base portion (20a) with
• a folding box, said folding box having four sidewalls (1, 2, 3, 4), said sidewalls, when the box is erected, forming a hollow, polygonal structure,
• a bottom wall (6) and a top wall (7), which bottom and top walls close off the box at the bottom and top, respectively;
• a first dust flap (10) integral with a first sidewall (1);
• a second dust flap (11) integral with another sidewall (3) which, when the box is erected, is located opposite the first sidewall (1), wherein
• said first and second dust flaps (10, 11) are formed at their free edges with respective projection-and-recess means (10a, 11b;
• 11a, 10b) forming projecting teeth-like portions (10a, 11a) positioned adjacent depressed or recessed portions (10b, 11b) and, respectively, located on said first and second dust flaps, such that the projecting portions of one of said dust flaps engages the depressed or recessed portions of the other dust flap,
• each of said dust flaps (10, 11), when the box is erected, being folded into the inside of the box and forming an angle less than 90.degree. with the respective sidewall (1, 3) on which Said dust flap (10, 11) is formed,
• said dust flaps, in the erected box, defining an inwardly extending, in cross-section essentially triangular, hollow rib, bridging the space inwardly of the erected box, and
• wherein one (11) of said dust flaps forming a side of said triangular bridge, together with an adjacent sidewall (3) of the box form a converging wedge-shaped corner defining an apex;
• and
• wherein said lamp is located within the box with the bulbous portion (20b) located beneath the apex of said essentially triangular bridge and said base portion (20a) and connecting terminal portion located in said corner, said dust flap (11) formed on said one sidewall (3) of the essentially triangular portion engaging against said lamp (20).