Indoor party firework mfr - has case and top filled with gifts, explosive charge with fuse and base being added under safety conditions

摘要

The indoor firework is made by assembling the case (1) from a cardboard blank, fitted with the top (3). The inner space is filled with gifts and small toys and a cardboard piston (2) fitted on top. These operations are done under normal production conditions. The end flanges (9) of the case are folded outwards and a small explosive charge (7) fitted on the piston. The firework is completed, and the case closed, by a flat base (13) fixed to the flanges. The base carries the fuse (6), passing through a hole in the side of the case. These operations are carried out under strict safety conditions.