Title: Prestressed cylindrical piezoelectric ultrasonic scaler

Abstract: The scaler includes a transducer and an energizing circuit. The transducer includes a tubular piezoelectric transducer element which is maintained in compressive stress when energized by an axial tension bolt adapted to mount a vibratory work tool. The energizing circuit drives the transducer element at its resonant frequency and maintains resonant frequency within an optimum band width, despite changes in capacitive reactance of the transducer element produced by torque applied thereto as the work tool is pressed against an object. A fluid delivery system delivers fluid to the work tool via the tension bolt to effect scaling.

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Inventors: Bussiere, Ronald L. (Edmonds, WA, US)
Adams, William D. (Edmonds, WA, US)

Application Number: 893969
Filing Date: 1978-04-06
Publication_date: 1979-09-18
Assignee:
Primary Class(es): 310/316.01 310/325
Other Classes:
US Patent Ref:

3210580	Oct, 1965	Bodin, Jr.	310/325.
3230403	Jan, 1966	Lewis	310/325.
3432691	Mar, 1969	Shoh	310/316.
3518766	Jul, 1970	Burt	310/325.
3651352	Mar, 1972	Puskas	310/316.
3809977	May, 1974	Balamuth	310/325.
3924335	Dec, 1975	Balamuth	310/325.
3934526	Jan, 1976	Damast et al.	310/323.

Other Refs:
Primary Examiner: Budd, Mark O.
Assistant Examiner:
Attorney: Dowrey & Cross