Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1976-06-03
1978-09-05
Peshock, Robert
Electrical generator or motor structure
Dynamoelectric
Rotary
32 58, 32DIG4, 310 26, A61C 1500
Patent
active
041109082
ABSTRACT:
An ultrasonic dental scaler is disclosed having a handpiece which comprises an outer shell, housing an electromechanical vibrator. The vibrator consists of a magnetostrictive transducer positioned within an energizing coil located within the shell, an acoustical impedance transformer connected at one end to the transducer, and a dental work tool connected to the other end of the transformer. The transformer provides an acoustical transmission line between the transducer and the work tool. An o-ring is mounted inside the sleeve at the balance point of the transformer to form the sole support for the vibrator. The o-ring support causes the nodal plane of the vibrator to shift from its natural position to the supported position. This forced shift of the nodal plane from its natural position causes the frequency of the system to change from its otherwise induced frequency so that the transducer length may be shortened without forfeiture of the desired operating frequency employed by such scalers.
REFERENCES:
patent: 3058218 (1962-10-01), Kleesattel et al.
patent: 3368280 (1968-02-01), Friedman et al.
patent: 3589012 (1971-06-01), Richman
patent: 3930173 (1975-12-01), Banko
Litton Industrial Products Inc.
Peshock Robert
Seldon Robert A.
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