Roman candle firework has inner plate and supporting ribs at lower end forming chamber for ejection charge

摘要

The firework, comprising a tubular body (2) with a closed lower end (10) and an open or openable upper end (9) containing a pyrotechnic ejection charge (43), an ignition controller (15) and a pyrotechnic effect charge (44), has the ejection charge located in a chamber of limited volume at the lower end of the body, formed by a series of vertical supporting ribs (39) and a transverse plate (45). The chamber is open on the effect charge side but closed to prevent the escape of gases from the ignition of the ejection charge.