US3810385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer means for ultrasonic extensometer
Assignee: McDonnell Douglas Corp
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Filing: 1972-04-03
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Granted: 1974-05-14
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Expires: 1992-04-03
Abstract
Abstract Magnetic transducer assembly for use with an ultrasonic extensometer for measuring the elongation of a bolt or the like being tightened against structure which it fastens, the extensometer including a transducer magnetically coupled to one end of the bolt, a pulser/receiver for generating a periodic pulse signal which energizes the transducer that is subsequently energized by the echo pulse from the far end of the bolt to provide an echo signal which is received and amplified, indicating circuit means for detecting and providing a correct couple indication between the transducer and its associated bolt end, and measuring circuit means for displaying a variable duration meter signal responsively produced by the amplified echo signal and controlled in duration by a vernier signal responsively produced by the pulse signal after a predetermined delay which is adjustable to index the vernier signal a desired amount with respect to the meter signal so that when the bolt has been elongated the proper amount, the amplified echo signal then coincides with the indexing vernier signal and the duration of the meter signal is reduced to zero.
Inventors
- 👤 E Friedmann
- 👤 Faul H Mc
- 👤 D Erdman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:36
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/24; G01L5/246; G01B; G01B17/00; G01B17/04; F; F16; F16B; F16B31/00; F16B31/02; F16B2031/022; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; and magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure, and said ring magnet comprising a generally tubular body having a magnetic, annular, normally lower end for contact with and attachment to said surface area generally encircling said transducer element, said body accommodating and mounting said transducer element therein.
Claim 2
Dependent Claim
125 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; and magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure, and said ring magnet comprising a generally tubular body having a magnetic, annular, normally lower end for contact with and attachment to said surface area generally encircling said transducer element, said body accommodating and mounting said transducer element therein.
Claim 3
Dependent Claim
61 words
The invention as defined in claim 1 further comprising pressure producing means for biasing said transducer element firmly against said encircled surface area of said structure, said pressure producing means including a spring means installed in said body and engaging with said transducer element to urge tHe same outwardly from said body and against said encircled surface area of said structure.
Claim 4
Dependent Claim
135 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; and magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure, and wherein said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and mounting said transducer element therein.
Claim 5
Dependent Claim
135 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; and magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure, and wherein said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and mounting said transducer element therein.
Claim 6
Dependent Claim
63 words
The invention as defined in claim 3 wherein said transducer element includes piezoelectric disc and an acoustical back-up block for mounting said disc with a face thereof effectively exposed to receive sonic waves from one general direction, said block being made of a relatively dense material and functioning to attentuate and damp any sonic waves received by said disc from other general directions.
Claim 7
Dependent Claim
152 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure; and pressure producing means for biasing said transducer element firmly against said encircled surface area of said structure, and wherein said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and mounting said transducer element therein.
Claim 8
Dependent Claim
152 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure; and pressure producing means for biasing said transducer element firmly against said encircled surface area of said structure, and wherein said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and mounting said transducer element therein.
Claim 9
Dependent Claim
34 words
The invention as defined in claim 5 wherein said pressure producing means includes a spring means installed in said body and engaging with said transducer element to urge the same outwardly from said body.
Claim 10
Dependent Claim
209 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure; and pressure producing means for biasing said transducer element firmly against said encircled surface area of said structure, and wherein said transducer element includes a piezoelectric disc and an acoustical back-up block for mounting said disc with a face thereof effectively exposed to receive sonic waves from one general direction, said block being made of a relatively dense material and functioning to attentuate and damp any sonic waves received by said disc from other general directions, and said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and Mounting said transducer element therein.
Claim 11
Dependent Claim
209 words
For use in an ultrasonic extensometer and the like, transducer means comprising: a transducer element; magnetic means for mounting said transducer element, said transducer element being mounted with respect to said magnetic means so that it can secure said transducer element firmly to selected structure, and said magnetic means including a ring magnet, said ring magnet being positioned to attach to said structure against the surface area generally encircling said transducer element and securing the latter in contact with encircled surface area of said structure; and pressure producing means for biasing said transducer element firmly against said encircled surface area of said structure, and wherein said transducer element includes a piezoelectric disc and an acoustical back-up block for mounting said disc with a face thereof effectively exposed to receive sonic waves from one general direction, said block being made of a relatively dense material and functioning to attentuate and damp any sonic waves received by said disc from other general directions, and said ring magnet includes a generally hollow cylindrical body having a radially inner layer of magnet material, a radially outer layer of magnet material and a cylindrical isolation sleeve separating said inner and outer layers of magnet material, said body accommodating and Mounting said transducer element therein.
Claim 12
Dependent Claim
54 words
The invention as defined in claim 7 wherein said pressure producing means includes a helically coiled spring installed in said body and engaging with said transducer element to urge the same outwardly from said body whereby said effectively exposed face of said disc is biased firmly against said encircled surface area of said structure.
References Cited (Backward Citations)
US3019637A
Cited
US3685350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |