US4075525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric accelerometer transducer
Assignee: Individual
•
Filing: 1976-12-14
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Granted: 1978-02-21
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Expires: 1996-12-14
Abstract
Abstract A piezoelectric transducer for use as an accelerometer has a polarized piezoelectric element sandwiched between a spigot and a sleeve. The element is hollow and conical, or frusto-conical so that the sandwiching effect can be achieved by means of axial clamping, as by a screw. This avoids the use of solders or adhesives and thus allows high temperature operation.
Inventors
- 👤 Donald Jack Birchall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0915; G01L; G01L1/00; G01L1/16; G01L9/00; G01L9/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A piezoelectric transducer comprising a hollow piezoelectric ceramic element having an axis, an internal conical surface and an external conical surface, the internal and external conical surfaces being inclined with respect to the axis in the same sense; the transducer further comprising a metal spigot; a metal sleeve; and a clamping arrangement for applying axial force to hold the element sandwiched between the spigot and the sleeve, the spigot and the sleeve having conical surfaces which make intimate surface contact with the internal and external conical surfaces of the element respectively.
Claim 2
Dependent Claim
91 words
A piezoelectric transducer comprising a hollow piezoelectric ceramic element having an axis, an internal conical surface and an external conical surface, the internal and external conical surfaces being inclined with respect to the axis in the same sense; the transducer further comprising a metal spigot; a metal sleeve; and a clamping arrangement for applying axial force to hold the element sandwiched between the spigot and the sleeve, the spigot and the sleeve having conical surfaces which make intimate surface contact with the internal and external conical surfaces of the element respectively.
Claim 3
Dependent Claim
31 words
A piezoelectric transducer as claimed in claim 1 wherein the ceramic element is a hollow truncated cone of which both conical surfaces have the same angle of inclination to the axis.
Claim 4
Dependent Claim
31 words
A piezoelectric transducer as claimed in claim 1 wherein the clamping arrangement comprises a bolt which is threaded into the spigot and which draws a clamping plate down onto the sleeve.
Claim 5
Dependent Claim
19 words
A piezoelectric transducer as claimed in claim 1 wherein at least the sleeve is made of sintered tungsten/copper alloy.
Claim 6
Dependent Claim
18 words
A piezoelectric transducer as claimed in claim 1 wherein at least the spigot is made of stainless steel.
Claim 7
Dependent Claim
16 words
A piezoelectric transducer as claimed in claim 1 wherein the piezoelectric ceramic element is axially polarised.
References Cited (Backward Citations)
US2216966A
Cited
US3727084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |