Electromagnetic signal horn

Details Electromagnetic signal horn Electromagnetic signal horn

1994-04-19

1997-01-07

Hofsass, Jeffery

Communications: electrical

Audible indication

Diaphragm

3403881, 116142R, G08B 300

Patent

active

055921450

ABSTRACT:
An electromagnetic signal horn of a type including a housing, a membrane whose peripheral edge is attached to the housing and which with the housing defines a chamber, an electromagnetic motor arranged in the chamber, and a magnetic core arranged in the chamber with an attaching pin thereof extending through a central opening of the membrane, with a coupling channel thereof, for coupling the chamber with outside atmosphere, being partially defined by a radial recess at the central opening of the membrane, wherein the central opening is four-sided, or square, for simplifying and economizing its fabrication, with a spacing between opposite sides of the central opening being the same, or only slightly larger than, a diameter of the attaching pin.

REFERENCES:
patent: 2301487 (1942-11-01), White
patent: 4135473 (1979-01-01), Frigo
patent: 4361952 (1982-12-01), Neese
patent: 4441099 (1984-04-01), Neese
patent: 4728933 (1988-03-01), Mazza
patent: 4763109 (1988-08-01), Smith
patent: 5270680 (1993-12-01), Lahaye et al.

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