Patent US3614487A successfully refreshed from Google Patents.
US3614487A
Expired / Lapsed
US
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Piezoelectric accelerometer with baseplate cooling
Assignee: Meggitt SA
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Filing: 1968-10-04
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Granted: 1971-10-19
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Expires: 1988-10-04
Abstract
Abstract A transducer, in particular a piezoelectric transducer for accelerometry, wherein the measuring elements are located in a housing comprising a bottom by means of which it is mounted on the object to be measured, at least one outwardly open recess being provided in the bottom.
Inventors
- 👤 Rudolf A Hatschek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/16; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
A transducer, particularly a piezoelectric accelerometer, comprising a housing having a bottom portion of rigid material forming a mounting base adapted to be mounted with its outer surface directly on to a surface of an object to be measured only along a level surface, and measuring elements located in the housing in mechanical contact with the bottom portion thereof, the said bottom portion serving for the transmission of mechanical forces from the object to be measured to the measuring elements, said bottom portion having at least one recess in the outer level surface thereof outwardly open towards the said surface to be measured thereby producing an airgap and reducing the contact area between the surface of the object to be measured and the outer surface of the said bottom portion of the housing.
Claim 2
Dependent Claim
133 words
A transducer, particularly a piezoelectric accelerometer, comprising a housing having a bottom portion of rigid material forming a mounting base adapted to be mounted with its outer surface directly on to a surface of an object to be measured only along a level surface, and measuring elements located in the housing in mechanical contact with the bottom portion thereof, the said bottom portion serving for the transmission of mechanical forces from the object to be measured to the measuring elements, said bottom portion having at least one recess in the outer level surface thereof outwardly open towards the said surface to be measured thereby producing an airgap and reducing the contact area between the surface of the object to be measured and the outer surface of the said bottom portion of the housing.
Claim 3
Dependent Claim
35 words
A transducer as claimed in claim 1, wherein ducts are provided extending from the recess as far as a marginal shell of the bottom portion of the housing and being in communication with the recess.
Claim 4
Dependent Claim
69 words
A transducer as claimed in claim 1, wherein ducts are provided extending from the recess as far as a marginal shell of the bottom portion of the housing and being in communication with the recess, and the ducts being formed by bores in communication with the recess and extending from the marginal shell of the bottom portion obliquely downwards as far as the recess provided in the bottom portion.
Claim 5
Dependent Claim
45 words
A transducer as claimed in claim 1, wherein grooves are provided recessed in the bottom portion of the housing extending as far as the marginal shell of the bottom portion and being open on the outside of the housing, said grooves forming the said recesses.
Claim 6
Dependent Claim
85 words
A transducer as claimed in claim 1, wherein grooves are provided recessed in the bottom portion of he housing extending as far as the marginal shell of the bottom portion and being open on the outside of the housing, said grooves forming the said recesses, and in which at least two bands of parallel grooves are provided with said bands of grooves crossing each other thereby subdividing the outer surface of the bottom portion into several surface elements distributed over and across the said surface.
Claim 7
Dependent Claim
27 words
A transducer according to claim 1, in which at least two recesses are provided in the bottom portion which are substantially at right angles to each other.
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |