Siren

Signals and indicators – Sirens

Patent

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Details

340405, 384145, 384146, 251310, G10K 704

Patent

active

046498532

ABSTRACT:
A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes are disposed at circumferentially spaced locations, and constitute together with the deflector plate and stator and rotor housing, plenums. There are fewer rotor ports than stator ports, which generates an out-of-phase acoustical pattern which creates an acoustic combination from the stator ports of an acoustic output at a distance from the siren which is more uniform spatially. The thermoplastic seal between the stator and the rotor has minimal clearance under operating conditions having been run-in and plastically deformed at a temperature higher than for normal operation.

REFERENCES:
patent: 2114654 (1938-04-01), Ekman
patent: 2130716 (1934-07-01), Ekman
patent: 2371657 (1945-03-01), Stark
patent: 2462862 (1949-03-01), Guthner
patent: 2514129 (1950-07-01), Horsley et al.
patent: 2528515 (1946-01-01), Heigis
patent: 2534833 (1950-12-01), Seavey et al.
patent: 2973978 (1961-03-01), Oppenheim
patent: 3060675 (1962-12-01), Parissi
patent: 3062555 (1962-11-01), Britton
patent: 3103941 (1963-09-01), Watters
patent: 3385392 (1968-05-01), Vios
patent: 4138673 (1979-02-01), Faust
patent: 4180188 (1979-12-01), Aonuma

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