Communications: electrical – Audible indication – Diaphragm
Patent
1980-10-09
1982-05-04
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Diaphragm
340392, G08B 310
Patent
active
043284868
ABSTRACT:
A horn includes a magnetically permeable housing having a diaphragm attached thereto and an electromagnet also attached to the housing. A carrier member loosely and unattachedly rests on a shelf in the housing and is attached to a striker member of magnetically permeable material. The striker member is located between the diaphragm and the electromagnet and is moved away from and against the diaphragm to generate noise.
REFERENCES:
patent: 1211768 (1917-01-01), Schwarzmann et al.
patent: 1267418 (1918-05-01), Kaisling
patent: 3530463 (1970-09-01), Spadini et al.
patent: 4075627 (1978-02-01), Pariza
Burnstein Philip J.
Seyler Gerard
Caldwell Sr. John W.
Myer Daniel
Pittway Corporation
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