Acoustic warning device, in particular a bell

Details Acoustic warning device, in particular a bell Acoustic warning device, in particular a bell

1976-12-23

1978-06-27

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340392, G08B 300

Patent

active

040978621

ABSTRACT:
An acoustic warning device of the type comprising a striker member which is also the movable core member of a control solenoid. A radially polarized permanent magnet is disposed at one end of the solenoid, e.g. opposite a gong therefor, and a spring defines with the permanent magnet a rest position of the core/striker member. The end of the core/striker member proximate to the permanent magnet is limited in its outward displacements within the axial extent of the permanent magnet means. The flux through the solenoid is carried mainly by the core member. The alternating polarization of the core/striker member ends is alternately attracted and repelled by the magnetic flux of the permanent magnet which is the equivalent of an imaginary axially polarized magnet in the passage through the solenoid.

REFERENCES:
patent: 2659074 (1953-11-01), Alexander
patent: 2683871 (1954-07-01), Meleski
patent: 2799016 (1957-07-01), Christy
patent: 2946905 (1960-07-01), Jolly
patent: 3375803 (1968-04-01), Doggart

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