Method of adjusting an electric horn air gap

Details Method of adjusting an electric horn air gap Method of adjusting an electric horn air gap

1988-01-25

1989-03-21

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29594, 296091, H04R 3100

Patent

active

048131237

ABSTRACT:
An electric horn has a diaphragm driven by a plunger which is vibrated by a coil having a pole piece. A small air gap between the plunger and the pole piece is required to assure that they will not touch during vibration. The gap is adjusted by assembling the horn with the gap small enough to permit the plunger to be pulled into contact with the pole piece by magnetic force when a preset direct current is applied to the coil. After assembly a calibration procedure is to apply the preset current to the coil, mechanically pull the pole piece away from the plunger until the diaphragm force overcomes the magnetic force causing the plunger and pole piece to separate, electrically detect the time of separation, and then stop or optionally pull the pole piece an additional fixed amount to set the required gap. Apparatus automatically performs the calibration procedure.

REFERENCES:
patent: 3516088 (1970-06-01), Allport
patent: 3864823 (1975-02-01), Berns
patent: 4135473 (1979-01-01), Frigo
patent: 4361952 (1982-12-01), Neese

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