Outdoor warning siren

An outdoor warning siren of the type including a rotor, a stator having a plurality of circumferentially spaced stator ports, and motor means for rotating the rotor within the stator to produce sound impulses which are emitted outwardly through said stator ports, the improvement comprising, in combination, a plurality of individual horns, each individual horn being connected to a corresponding one of said stator ports to receive sound impulses therefrom and having a turn to redirect the sound impulses in the same general direction, each individual horn having a cross-sectional area which increases throughout the length of said horn in approximately exponential fashion, and a common horn which receives sound impulses from outlets of said individual horns and conducts the same to atmosphere to produce a warning sound to the surrounding area, said common horn having a cross-sectional area which increases throughout the length thereof in approximately linear fashion.

An outdoor warning siren of the type including a rotor, a stator having a plurality of circumferentially spaced stator ports, and motor means for rotating the rotor within the stator to produce sound impulses which are emitted outwardly through said stator ports, the improvement comprising, in combination, a plurality of idividual horns, each one connected to a corresponding one of said stator ports and having an inlet or throat portion connected to a stator outlet port and an outlet or mouth portion directed approximately 90 degrees to said stator port whereby said individual horns redirect sound impulses emitted from said stator ports to a common direction approximately 90 degrees to said stator ports, and a common horn which receives sound impulses from outlets of all of said individual horns and conducts the same to atmosphere to produce a warning sound to the surrounding area.

An outdoor warning siren of the type including a rotor, a stator having a plurality of circumferentially spaced stator ports, and motor means for rotating the rotor within the stator to produce sound impulses which are emitted outwardly through said stator ports, said improvement comprising, in combination, said motor means including a dc motor powered by batteries, a plurality of individual horns, each one connected to a corresponding one of said stator ports and having an inlet or throat portion connected to a stator outlet port and an outlet or mouth portion directed approximately 90 degrees to said stator port whereby said individual horns redirect sound impulses emitted from said stator ports to a common direction approximately 90 degrees to said stator ports, each of said individual horns having a cross-sectional area which increases from the inlet to the outlet thereof in approximately exponential fashion, and a common horn which receives sound impulses from outlets of all of said individual horns and conducts the same to atmosphere to produce a warning sound to the surrounding area, said common horn including an outer conical member which is flared outwardly from its inlet toward its outlet and an inner conical member which is flared inwardly from its inlet toward its outlet.

An outdoor warning siren of the type including a rotor, a stator having a plurality of circumferentially spaced stator ports, and motor means for rotating the rotor within the stator to produce sound impulses which are emitted outwardly through said stator ports, the improvement comprising, in combination, a plurality of individual horns, each individual horn being connected to a corresponding one of said stator ports to receive sound impulses therefrom and having a turn to redirect the sound impulse in the same general direction to form a ring radiator, each of said horns decreasing in axial depth while increasing in circumferential width and increasing in cross-sectional area.

An outdoor warning siren of the type including a rotor, a stator having a plurality of circumferentially spaced stator ports, and motor means for rotating the rotor within the stator to produce sound impulses which are emitted outwardly through said stator ports, the improvement comprising, in combination, a plurality of individual horns, each individual horn being connected to a corresponding one of said stator ports to receive sound impulses therefrom and having a turn to redirect the sound impulses in the same general direction to form a ring radiator, each of said horns decreasing in axial depth while increasing in circumferential width and increasing exponentially in cross-sectional area, said rotor having ports and closures having approximately the same circumferential width and said stator ports having a circumferential width which is less than the circumferential width of stator closures to form stator ports which are relatively long axially and relatively narrow circumferentially.