Patent US3694675A successfully refreshed from Google Patents.
US3694675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooled ultrasonic transducer
Assignee: Eastman Kodak Co
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Filing: 1971-02-25
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Granted: 1972-09-26
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Expires: 1991-02-25
Abstract
Abstract Ultrasonic apparatus comprises a centrally bolted ultrasonic transducer having passages for internal cooling by a stream of fluid such as air. Radial ducts in a metal back mass open into an enlarged portion of a first bolt hole adjacent the bolt for supplying air. Air then flows forward through an annular passage in the piezoelectric crystal means and enters an enlarged portion of a second bolt hole in a metal front mass from which it is discharged through radial ducts in the front mass. Both enlarged portions should be of oval shape to assure strength and rigidity. A housing can surround the transducer for externally cooling it with a stream of air. The transducer can be mounted on the housing by a perforate plate or flange.
Inventors
- 👤 Thomas E Loveday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:08
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618; B06B3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
217 words
Ultrasonic apparatus comprising an ultrasonic transducer comprising, in combination, a metal back mass having a first longitudinal bolt hole; a metal front mass having a second longitudinal bolt hole aligned with said first bolt hole; annular piezoelectric responsive means sandwiched between said front and back masses, and having central passage means therethrough aligned with said first and second bolt holes; and a central retaining bolt passing through said first bolt hole, through said central passage means in spaced relation to the wall thereof, and into said second bolt hole; said first and second bolt holes being enlarged transversely over only portions thereof adjacent said piezoelectric responsive means to space the walls thereof from said bolt; and said back mass and said front mass having first and second passage means therein, respectively, extending transversely from the outside thereof into the enlarged portions of the bolt holes therein, the construction and arrangement being such that continuous passage means for cooling fluid is formed comprising said transverse passage means, said enlarged portions, and said central passage means; said apparatus also comprising a housing surrounding saiD transducer in annularly spaced relation thereto, and conduit means extending between the inside and the outside of said housing and connected into said first passage means in said back mass for supplying cooling fluid thereto.
Claim 2
Dependent Claim
217 words
Ultrasonic apparatus comprising an ultrasonic transducer comprising, in combination, a metal back mass having a first longitudinal bolt hole; a metal front mass having a second longitudinal bolt hole aligned with said first bolt hole; annular piezoelectric responsive means sandwiched between said front and back masses, and having central passage means therethrough aligned with said first and second bolt holes; and a central retaining bolt passing through said first bolt hole, through said central passage means in spaced relation to the wall thereof, and into said second bolt hole; said first and second bolt holes being enlarged transversely over only portions thereof adjacent said piezoelectric responsive means to space the walls thereof from said bolt; and said back mass and said front mass having first and second passage means therein, respectively, extending transversely from the outside thereof into the enlarged portions of the bolt holes therein, the construction and arrangement being such that continuous passage means for cooling fluid is formed comprising said transverse passage means, said enlarged portions, and said central passage means; said apparatus also comprising a housing surrounding saiD transducer in annularly spaced relation thereto, and conduit means extending between the inside and the outside of said housing and connected into said first passage means in said back mass for supplying cooling fluid thereto.
Claim 3
Dependent Claim
27 words
Ultrasonic apparatus in accordance with claim 1, said first and second passage means being a plurality of radial passages in each of said back and front masses.
Claim 4
Dependent Claim
40 words
Ultrasonic apparatus in accordance with claim 2, each of said back and front masses having two of said radial passages aligned axially with one another, the passages of said back mass being displaced 90* from those of said front mass.
Claim 5
Dependent Claim
104 words
Ultrasonic apparatus in accordance with claim 1, each of said first and second bolt holes comprising portions of generally oval cross section at the ends thereof toward said crystal means, and portions of cylindrical cross section at the ends thereof away from said crystal means, the walls of said cylindrical portions and the walls at the ends of the minor axes of said oval portions engaging said bolt, the walls at the ends of the major axes of said oval portions being spaced from said bolt, said first and second passage means opening into said bolt holes at the ends of said major axes.
Claim 6
Dependent Claim
20 words
Ultrasonic apparatus in accordance with claim 4, the major axes of said oval portions being displaced 90* from one another.
Claim 7
Dependent Claim
61 words
Ultrasonic apparatus in accordance with claim 1, also comprising a perforate supporting device connecting said transducer to said housing, and means for introducing cooling fluid into said housing to flow around the outside of said transducer and out through the perforations in said supporting device, said second passage means being located outside of said housing and spaced from said supporting device.
Claim 8
Dependent Claim
47 words
Ultrasonic apparatus in accordance with claim 7, said supporting device being a metal flange clamped against said piezoelectric responsive means, said flange having a central bore provided with a wall spaced annularly from said bolt and aligned with said central passage means, and with said bolt holes.
Claim 9
Dependent Claim
46 words
Ultrasonic apparatus in accordance with claim 1, said first passage means being a plurality of individual radial passages in said back mass, said conduit means comprises a plurality of individual conduits severally extending from said radial passages between the inside and the outside of said housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |