Pressurized fluid powered horn

Claim 1

A pressurized fluid powered audible alarm device comprising: a housing; a container of pressurized fluid mounted in said housing, said container having a deflection responsive valve and outlet member projecting therefrom for selectively dispensing said pressurized fluid from said container through said valve and outlet member in response to displacement of said valve and outlet member in a predetermined direction; a horn mounted on said outlet member for receiving said pressurized fluid; said horn being excited to sound in response to pressurized fluid passing through said horn; said horn receiving pressurized fluid in response to displacement of said horn relative to said housing in said predetermined direction and consequent deflection of said valve and outlet member; a plunger carried slideably by said housing proximate said horn and being positioned for selectively approaching said horn from a direction opposite said predetermined direction; spring means acting between said plunger and said horn for urging said plunger to contact and displace said horn in said predetermined direction; removeable means for retaining said plunger spaced from said horn against the urging of said spring means; said removeable means including a pull ring to facilitate rapid removal of said removeable means; said pressurized fluid in said container having a liquid phase and a gaseous phase; a tubular intake duct within said container; one end of said duct being connected to said valve and outlet member, the other end of said duct being open and being positioned in said container; the volume of said liquid phase and the length of said duct being selected to be of a preselected volume and length, respectively, for preventing said liquid phase from contacting the open end of said duct in any orientation of said device.