US5012835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle flapper mechanism
Assignee: SMC Corp
•
Filing: 1990-04-12
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Granted: 1991-05-07
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Expires: 2010-04-12
Abstract
Abstract A nozzle flapper mechanism includes an electrostrictive device, a plate member coupled to the electrostrictive device, a nozzle having an orifice facing the electrostrictive device or the plate member, and a controller for applying a voltage to the electrostrictive device to keep a nozzle back pressure constant or vary the nozzle back pressure. The electrostrictive device comprises a shim, piezoelectric ceramics members disposed on the shim, and thin-film electrodes disposed on the piezoelectric ceramics members, the electrodes having an area smaller than that of the piezoelectric ceramics members, the piezoelectric ceramics members having one end directly fixed in position on a stationary member.
Inventors
- 👤 Motoshige Ikehata
- 👤 Hiroyuki Mikami
- 👤 Naoto Inayama
- 👤 Katsuhiko Odajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/004; F16K31/005; F16K31/006; F15; F15C; F15C3/00; F15C3/10; F15C3/14; F16K31/02; H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; Y; Y10; Y10T; Y10T137/00; Y10T137/2278
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A nozzle flapper mechanism comprising: an electrostrictive device; a plate member coupled to said electrostrictive device; a nozzle having an orifice facing the plate member on said electrostrictive device; and means for applying a voltage to said electrostrictive device to keep a nozzle back pressure constant or vary the nozzle back pressure; said electrostrictive device comprising a plurality of piezoelectric ceramics members, and a plurality of thin-film electrodes disposed on faces and backs of said piezoelectric ceramics members; wherein said electrodes have leads extending respectively therefrom, said leads also being disposed on the faces and backs of said piezoelectric ceramics members positioned to one side thereof, the lead from each of said electrodes being positioned on an opposite side of the electrostrictive device with respect to the lead from an adjacent one of said electrodes.
Claim 2
Dependent Claim
135 words
A nozzle flapper mechanism comprising: an electrostrictive device; a plate member coupled to said electrostrictive device; a nozzle having an orifice facing the plate member on said electrostrictive device; and means for applying a voltage to said electrostrictive device to keep a nozzle back pressure constant or vary the nozzle back pressure; said electrostrictive device comprising a plurality of piezoelectric ceramics members, and a plurality of thin-film electrodes disposed on faces and backs of said piezoelectric ceramics members; wherein said electrodes have leads extending respectively therefrom, said leads also being disposed on the faces and backs of said piezoelectric ceramics members positioned to one side thereof, the lead from each of said electrodes being positioned on an opposite side of the electrostrictive device with respect to the lead from an adjacent one of said electrodes.
Claim 3
Dependent Claim
37 words
A nozzle flapper mechanism according to claim 1, further including an electric conductor connected to alternating ones of said electrodes on said piezoelectric ceramics members and connecting said alternating ones of the electrodes to a power supply.
Claim 4
Dependent Claim
20 words
A nozzle flapper mechanism according to claim 1, wherein the leads from said electrodes are positioned alternately on opposite sides.
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |