Patent US3716828A successfully refreshed from Google Patents.
US3716828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer with improved shock resistance
Assignee: MASSA DONALD P COHASSET
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Filing: 1970-02-02
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Granted: 1973-02-13
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Expires: 1990-02-02
Abstract
Abstract An electromechanical transducer assembly comprises a stacked group of axially aligned piezoelectric ceramic rings. Plates, which have a larger diameter than the ceramic rings, are positioned between each of the adjoining faces of the ceramic rings. Therefore, the edges of the plates extend outwardly beyond the periphery of the ceramic rings. A tape or filament is tightly wound about the rim of each ceramic ring to maintain a radial stress upon the ceramic elements.
Inventors
- 👤 F Massa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:32
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
An electromechanical transducer assembly comprising at least two transducer elements for converting electrical oscillations to mechanical vibrations, each of said transducer elements having an external peripheral surface, said transducer elements being assembled together with said external peripheral surfaces held in a substantial alignment, a plurality of plate members each having an outer periphery, the periphery of said plate members being larger in radial dimension than the external peripheral surface of said transducer elements, said transducer elements being assembled between a pair of said plate members whereby the peripheries of said plate members project beyond the peripheries of said transducer elements to provide a bobbin-like form, and a continuous filament tightly wrapped on said bobbin from in direct physical contact with the external peripheral surfaces of said transducer elements for circumferentially applying a substantially uniform compressive stress directly to said external peripheral surfaces of said transducer elements throughout the entire ambient temperature range.
Claim 2
Dependent Claim
152 words
An electromechanical transducer assembly comprising at least two transducer elements for converting electrical oscillations to mechanical vibrations, each of said transducer elements having an external peripheral surface, said transducer elements being assembled together with said external peripheral surfaces held in a substantial alignment, a plurality of plate members each having an outer periphery, the periphery of said plate members being larger in radial dimension than the external peripheral surface of said transducer elements, said transducer elements being assembled between a pair of said plate members whereby the peripheries of said plate members project beyond the peripheries of said transducer elements to provide a bobbin-like form, and a continuous filament tightly wrapped on said bobbin from in direct physical contact with the external peripheral surfaces of said transducer elements for circumferentially applying a substantially uniform compressive stress directly to said external peripheral surfaces of said transducer elements throughout the entire ambient temperature range.
Claim 3
Dependent Claim
152 words
An electromechanical transducer assembly comprising at least two transducer elements for converting electrical oscillations to mechanical vibrations, each of said transducer elements having an external peripheral surface, said transducer elements being assembled together with said external peripheral surfaces held in a substantial alignment, a plurality of plate members each having an outer periphery, the periphery of said plate members being larger in radial dimension than the external peripheral surface of said transducer elements, said transducer elements being assembled between a pair of said plate members whereby the peripheries of said plate members project beyond the peripheries of said transducer elements to provide a bobbin-like form, and a continuous filament tightly wrapped on said bobbin from in direct physical contact with the external peripheral surfaces of said transducer elements for circumferentially applying a substantially uniform compressive stress directly to said external peripheral surfaces of said transducer elements throughout the entire ambient temperature range.
Claim 4
Dependent Claim
152 words
An electromechanical transducer assembly comprising at least two transducer elements for converting electrical oscillations to mechanical vibrations, each of said transducer elements having an external peripheral surface, said transducer elements being assembled together with said external peripheral surfaces held in a substantial alignment, a plurality of plate members each having an outer periphery, the periphery of said plate members being larger in radial dimension than the external peripheral surface of said transducer elements, said transducer elements being assembled between a pair of said plate members whereby the peripheries of said plate members project beyond the peripheries of said transducer elements to provide a bobbin-like form, and a continuous filament tightly wrapped on said bobbin from in direct physical contact with the external peripheral surfaces of said transducer elements for circumferentially applying a substantially uniform compressive stress directly to said external peripheral surfaces of said transducer elements throughout the entire ambient temperature range.
Claim 5
Dependent Claim
18 words
The invention of claim 1 further characterized in that said wrapping includes a filament which is electrically non-conductive.
Claim 6
Dependent Claim
39 words
The invention of claim 2 further characterized in that said filament is a glass fiber and still further characterized in that said filament is kept under tension while it is being wrapped over the periphery of said transducer element.
Claim 7
Dependent Claim
98 words
An electromechanical transducer assembly comprising a plurality of ring-shaped piezoelectric elements, means for bonding said elements together in substantial axial alignment, and a continuous filament of material having a modulus of elasticity generally corresponding to the modulus of elasticity of glass fiber and stainless steel, said filament being tightly wrapped in direct physical contact with the outside perimeter of said piezoelectric elements for applying a substantially uniform compressive stress around the peripheries of said bonded elements, said means for applying said uniform compressive stress being characterized in that said compressive stress is uniformly maintained with the ceramic material.
Claim 8
Dependent Claim
98 words
An electromechanical transducer assembly comprising a plurality of ring-shaped piezoelectric elements, means for bonding said elements together in substantial axial alignment, and a continuous filament of material having a modulus of elasticity generally corresponding to the modulus of elasticity of glass fiber and stainless steel, said filament being tightly wrapped in direct physical contact with the outside perimeter of said piezoelectric elements for applying a substantially uniform compressive stress around the peripheries of said bonded elements, said means for applying said uniform compressive stress being characterized in that said compressive stress is uniformly maintained with the ceramic material.
Claim 9
Dependent Claim
20 words
The assembly of claim 4 and means for applying compressive forces along substantially the aligned axis of said bonded elements.
Claim 10
Dependent Claim
160 words
The assembly of claim 5 and a plurality of metal flange plates separating said ring-shaped elements, said bonding means being epoxy cement loaded with silver dust interposed between sAid elements and flange plates, said axial stress applying means comprising a stress bolt and a plurality of Belleville-type springs, said peripheral compressive stress applying means comprising a fiberglass filament tightly wound around the periphery of said piezoelectric rings and between said flange plates and bonded into a consolidated solid mass by an impregnating epoxy bonding agent, said piezoelectric rings being polarized in their axial dimensions and assembled into a stack of rings with said rings oriented so that the same electrical polarities are abutting each other when adjacent rings are placed in said axial alignment, and two electrical conductors attached to alternate ones of said flange plates, respectively, according to the electrical polarities of the abutting ceramic rings, thereby providing positive and negative terminals for connecting external equipment to said assembly.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |