Communications: electrical – Audible indication – Diaphragm
Patent
1977-02-02
1978-02-21
Pitts, Harold I.
Communications: electrical
Audible indication
Diaphragm
340392, G08B 310
Patent
active
040756270
ABSTRACT:
A horn of improved, compact and efficient construction, formed of a minimum of components, is characterized by an electromagnetic coil within a closely confining magnetically permeable housing having an open end and relatively imperforate wall areas, a diaphragm positioned over and closing the open end, a striker operatively associated with the coil for repetitively striking the diaphragm to generate noise, and a cover having a sound directing port positioned over the diaphragm and forming therewith a sound chamber for directing generated noise toward and out of the port. The horn is thus formed of a small number of parts and is very economical.
The housing itself serves as the electromagnetic flux path for the coil, and therefore reduces the number of parts and the number of manufacturing steps required in the production of the horn. At the same time, the relatively imperforate wall areas of the housing, together with maintenance of parallelism between the components of the horn, maximizes the noise generated by the horn.
REFERENCES:
patent: 2658194 (1953-11-01), Kalin
patent: 2896202 (1959-07-01), Bonanno
patent: 3179932 (1965-04-01), Gregoroff
patent: 3408645 (1968-10-01), Doggart
patent: 3631480 (1971-12-01), Heap
Pitts Harold I.
Pittway Corporation
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