Metal working – Method of mechanical manufacture – Electrical device making
Patent
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
Neese James A.
Wilson Carl R.
Hall Carl E.
Sparton Corporation
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