US3733661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a piezoelectric transducer and transducer manufactured by this method
Assignee: LIST H OE
•
Filing: 1971-01-25
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Granted: 1973-05-22
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Expires: 1991-01-25
Abstract
Abstract Method and apparatus for the manufacture of piezoelectric transducers in which a tube spring is prestressed by an axial load with the tube welded to a transducer housing member.
Inventors
- 👤 R Zieringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
258 words
A method for the manufacture of a piezoelectric transducer having a transducer housing, a rigid support formed by the front end of the housing, a cylindrical outer surface of the housing concentric with respect to the longitudinal axis of the transducer, a tube spring having an open end facing the support and a bottom at its opposite end, a cylindrical counter-surface concentric with the longitudinal axis of the transducer at the open end of the tube spring and registering with the cylindrical surface of the transducer housing, a piezoelectric measuring element mounted between the support and the bottom of the tube spring and axially prestressed therebetween, and an annular weld on the open end of the tube spring adjoining the cylindrical counter-surface thereof, comprising the steps of: 1. joining the tube spring with the transducer housing member adjacent to said cylindrical surface and said cylindrical counter-surface so that the measuring element abuts against said support and against the tube spring bottom, 2. prestressing the measuring element with a measured axial load upon the transducer housing and the tube spring, and 3. welding the open tube spring end to the transducer housing member adjacent welding edges of these members to provide an annular closed weld contiguous to said first-mentioned welding edges, said welding being performed simultaneously with continuously measuring the prestressed load of said measuring element by means of the measuring element and automatically regulating the axial load as a function of said measured prestress to maintain said prestress equivalent to a predetermined theoretical prestress during the welding process.
Claim 2
Independent Claim
258 words
A method for the manufacture of a piezoelectric transducer having a transducer housing, a rigid support formed by the front end of the housing, a cylindrical outer surface of the housing concentric with respect to the longitudinal axis of the transducer, a tube spring having an open end facing the support and a bottom at its opposite end, a cylindrical counter-surface concentric with the longitudinal axis of the transducer at the open end of the tube spring and registering with the cylindrical surface of the transducer housing, a piezoelectric measuring element mounted between the support and the bottom of the tube spring and axially prestressed therebetween, and an annular weld on the open end of the tube spring adjoining the cylindrical counter-surface thereof, comprising the steps of: 1. joining the tube spring with the transducer housing member adjacent to said cylindrical surface and said cylindrical counter-surface so that the measuring element abuts against said support and against the tube spring bottom, 2. prestressing the measuring element with a measured axial load upon the transducer housing and the tube spring, and 3. welding the open tube spring end to the transducer housing member adjacent welding edges of these members to provide an annular closed weld contiguous to said first-mentioned welding edges, said welding being performed simultaneously with continuously measuring the prestressed load of said measuring element by means of the measuring element and automatically regulating the axial load as a function of said measured prestress to maintain said prestress equivalent to a predetermined theoretical prestress during the welding process.
Claim 3
Dependent Claim
18 words
prestressing the measuring element with a measured axial load upon the transducer housing and the tube spring, and
Claim 4
Dependent Claim
18 words
prestressing the measuring element with a measured axial load upon the transducer housing and the tube spring, and
Claim 5
Dependent Claim
15 words
The method according to claim 1 wherein the welding process is performed by arc welding.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein the welding process is performed by plasma arc jet welding.
Claim 7
Dependent Claim
77 words
welding the open tube spring end to the transducer housing member adjacent welding edges of these members to provide an annular closed weld contiguous to said first-mentioned welding edges, said welding being performed simultaneously with continuously measuring the prestressed load of said measuring element by means of the measuring element and automatically regulating the axial load as a function of said measured prestress to maintain said prestress equivalent to a predetermined theoretical prestress during the welding process.
Claim 8
Dependent Claim
77 words
welding the open tube spring end to the transducer housing member adjacent welding edges of these members to provide an annular closed weld contiguous to said first-mentioned welding edges, said welding being performed simultaneously with continuously measuring the prestressed load of said measuring element by means of the measuring element and automatically regulating the axial load as a function of said measured prestress to maintain said prestress equivalent to a predetermined theoretical prestress during the welding process.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |