Compressed air driven horn with membrane - has plastic seating for membrane, and exponential amplifying cone

摘要

A compressed air-driven horn produces a sound amplified by an exponential cone. It has a construction which is not sensitive to damage of the membrane seat during manufacture. The horn has a cup-shape metal casing (50) and a membrane (52). The membrane (52) is clamped and held taut over a disc (53). The tightness of the membrane (52) is adjusted by a screw (54) pressing on the disc (53). The membrane (52) is also held by a plastic seat (59). The plastic seat (59) is fitted in the metal casing (50). The seat (59) has its bore in line with an opening (62) in the casing (50). The opening (62) of the casing (50) takes the exponential cone of the horn. An adaptor (64) is used for a compressed air pipe.