Communications: electrical – Audible indication – Diaphragm
Patent
1994-12-20
1999-02-02
Lefkowitz, Edward
Communications: electrical
Audible indication
Diaphragm
3403883, 3403911, 116142R, 381190, 381191, G08B 300
Patent
active
058670904
ABSTRACT:
Disclosed is a diaphragm buzzer including a lower cover and an upper cover. A sheet buzz element having a centered diaphragm is disposed inside the lower and the upper cover and is protectively sandwiched between a press plate and a plastic washer before it is fixed to the upper cover, lest the sheet buzz element should detach from the wires connecting it to a circuit board and become loose and damaged in the two covers.
REFERENCES:
patent: 4175262 (1979-11-01), Harakawa et al.
patent: 4284857 (1981-08-01), Slavin et al.
patent: 4810997 (1989-03-01), Kudo et al.
patent: 4823110 (1989-04-01), Dorward et al.
Klein David I.
Lee Jun Y.
Lefkowitz Edward
Rosenberg Morton J.
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