Telephone ringer

Details Telephone ringer Telephone ringer

1988-01-29

1989-04-18

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

340397, 340392, H04M 102

Patent

active

048233790

ABSTRACT:
A magnetically controlled steel ball armature functions as a clapper to strike a gong. A positionally adjustable permanent magnet polarizes the ball and positions it relative to the gong. An electromagnet modulates the magnetic field of the permanent magnet to drive the ball strikingly against the gong. Bell tap is suppressed by adjusting the position of the permanent magnet relative to the gong.

REFERENCES:
patent: 1009345 (1911-11-01), Suave
patent: 2683871 (1954-07-01), Meleski
patent: 4097862 (1978-06-01), Brionne

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