US3788593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic timer
Assignee: Elsag International BV
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Filing: 1972-02-02
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Granted: 1974-01-29
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Expires: 1992-02-02
Abstract
Abstract Back pressure from a vane and nozzle assembly continuously supplies a timing chamber with a pressure which is substantially independent of the supply pressure variations at the vane and nozzle assembly input maintaining a predetermined chamber volume and pressure thereby. When an input signal is provided to an input chamber, a valve blocks the vane and nozzle back pressure from the timing chamber and the predetermined volume of the timing chamber is vented, with the volume decreasing in response to timing chamber pressure drop, until an output signal from the fluidic timer is triggered. When the input signal is removed from the input chamber, vane and nozzle back pressure is restored to the timing chamber and it is reset to the predetermined volume and pressure level.
Inventors
- 👤 K Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:54
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/02; F15C; F15C3/00; F15C4/00; H; H01; H01H; H01H43/00; H01H43/24; H01H43/28; H01H43/285; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A fluidic timing apparatus, comprising: a timer body having a pressure inlet and a venting port; a diaphragm connected to said timer body to form a variable volume timing chamber; supply means, connected to the pressure inlet of said main body assembly, for pressurizing the timing chamber of said timer body to a predetermined pressure and volume; switching means, connected between said supply means and the pressure inlet of said timer body, for decoupling said supply means from the timing chamber of said timer body in response to an input signal; output means, coupled with the timing chamber of said timer body, for producing a signal upon substantial evacuation of the timing chamber of said timer body; wherein said venting port includes means for adjusting the venting rate of the timing chamber of said timer body; and including means for adjusting the timing chamber pressure of said timer body to a desired value.
Claim 2
Dependent Claim
153 words
A fluidic timing apparatus, comprising: a timer body having a pressure inlet and a venting port; a diaphragm connected to said timer body to form a variable volume timing chamber; supply means, connected to the pressure inlet of said main body assembly, for pressurizing the timing chamber of said timer body to a predetermined pressure and volume; switching means, connected between said supply means and the pressure inlet of said timer body, for decoupling said supply means from the timing chamber of said timer body in response to an input signal; output means, coupled with the timing chamber of said timer body, for producing a signal upon substantial evacuation of the timing chamber of said timer body; wherein said venting port includes means for adjusting the venting rate of the timing chamber of said timer body; and including means for adjusting the timing chamber pressure of said timer body to a desired value.
Claim 3
Dependent Claim
42 words
A fluidic timing apparatus as set forth in claim 1 wherein said supply means includes a vane and nozzle with the vane coupled to said diaphragm by a stem to provide a feedback signal from the timing chamber to said supply means.
Claim 4
Dependent Claim
53 words
A fluidic timing apparatus set forth in claim 2 wherein said output means includes: a permanent magnet located on said diaphragm; and an output vane and nozzle, located externally of the timing chamber, to provide an output signal upon said permanent magnet magnetically coupling with the vane of said output vane and nozzle.
Claim 5
Dependent Claim
39 words
A fluidic timing apparatus as set forth in claim 3 wherein said timing chamber pressure adjusting means includes an adjustable spring connected to said diaphragm to require its force to be balanced by the pressure in the timing chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |