Patent US3748504A successfully refreshed from Google Patents.
US3748504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric motor
Assignee: Braun GmbH
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Filing: 1972-02-16
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Granted: 1973-07-24
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Expires: 1992-02-16
Abstract
Abstract A piezoelectric motor, in particular a vibrator, for producing essentially straight line movements of a part, in which a plurality of piezoelectrically excitable bending strips are mutually mechanically connected in parallel as a package between the part to be moved and a fixed part. The motor is particularly suited for use in an electric dry shaver and has high mechanical power and efficiency, less noise and less weight than prior piezoelectric motors.
Inventors
- 👤 M Guntersdorfer
- 👤 W Heywang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:53
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/28; B26B19/282; H; H02; H02N; H02N2/00; H02N2/02; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/2043
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
224 words
A piezoelectric motor for producing reciprocating motion of movable parts, comprising: a housing; a plurality of first parallel piezoelectrically excitable elongate bending elements aligned with each other and disposed in said housing, each of said first elements having first and second ends; a plurality of parallel piezoelectrically excitable elongate bending elements aligned with each other and with said first bending elements and disposed in said housing, each of said second elements having first and second ends; a plurality of first spacing members and a plurality of second spacing members, said first and second spacing members disposed between and contacting the respective first and second ends of said beNding elements; a first mounting device connected to said housing and securing said first ends of said first and second elements and said first spacing members; second and third mounting devices carrying respective ones of the movable parts and respectively securing said second ends of said first and second elements and said second spacing members, said second bending elements adapted to reciprocate 180* out of phase with respect to said first bending elements; and a mechanical lever arrangement connected between said first elements and said second elements to lower the resonant frequency of said first and second elements and compensate for the opposite forces due to the out of phase operation of said first and second elements.
Claim 2
Dependent Claim
224 words
A piezoelectric motor for producing reciprocating motion of movable parts, comprising: a housing; a plurality of first parallel piezoelectrically excitable elongate bending elements aligned with each other and disposed in said housing, each of said first elements having first and second ends; a plurality of parallel piezoelectrically excitable elongate bending elements aligned with each other and with said first bending elements and disposed in said housing, each of said second elements having first and second ends; a plurality of first spacing members and a plurality of second spacing members, said first and second spacing members disposed between and contacting the respective first and second ends of said beNding elements; a first mounting device connected to said housing and securing said first ends of said first and second elements and said first spacing members; second and third mounting devices carrying respective ones of the movable parts and respectively securing said second ends of said first and second elements and said second spacing members, said second bending elements adapted to reciprocate 180* out of phase with respect to said first bending elements; and a mechanical lever arrangement connected between said first elements and said second elements to lower the resonant frequency of said first and second elements and compensate for the opposite forces due to the out of phase operation of said first and second elements.
Claim 3
Dependent Claim
73 words
A piezoelectric motor according to claim 1, wherein said mechanical lever arrangement comprises a pendulum shaped device having a mass portion and an arm portion extending therefrom and pivotally fixed to said housing, said second mounting device of said first plurality of bending elements and said third mounting device of said plurality of second bending elements pivotally attached to said arm portion on opposite sides of its pivotally fixed connection to said housing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |