US3695388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quiet jet discharge nozzle
Assignee: Textron Inc
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Filing: 1971-06-14
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Granted: 1972-10-03
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Expires: 1991-06-14
Abstract
Abstract An improved air/gas jet nozzle of multiple orifice form is disclosed, the output of which is substantially inaudible to the human ear. The nozzle comprises an airfoil-shaped plenum having discharge orifices in its trailing edge. Sheaths of inaudible range vibrating air are induced to surround the discharge streams from the nozzle orifices and mask the audible range sound therein.
Inventors
- 👤 Vincent B Paxhia
- 👤 Franklin B Bossler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:48
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
An inaudible thrust producing discharge nozzle device comprising an externally airfoil-shaped plenum having a trailing edge and air discharge orifice means extending through the wall portion of said trailing edge, said orifice means including a row of separate orifices of circular section directing discharge of high speed air jet streams from said plenum rearwardly of said trailing edge and being relatively spaced apart so as to induce Flows of air from the ambient atmosphere encasing each high speed dis-charge jet stream within a non-turbulent sheath of inaudible range vibrating air, thereby masking the audible range sound propogations of said jet streams until they are attenuated and reduced to inaudible levels.
Claim 2
Dependent Claim
110 words
An inaudible thrust producing discharge nozzle device comprising an externally airfoil-shaped plenum having a trailing edge and air discharge orifice means extending through the wall portion of said trailing edge, said orifice means including a row of separate orifices of circular section directing discharge of high speed air jet streams from said plenum rearwardly of said trailing edge and being relatively spaced apart so as to induce Flows of air from the ambient atmosphere encasing each high speed dis-charge jet stream within a non-turbulent sheath of inaudible range vibrating air, thereby masking the audible range sound propogations of said jet streams until they are attenuated and reduced to inaudible levels.
Claim 3
Dependent Claim
32 words
A nozzle as set forth in claim 1 wherein said orifice means comprises two rows of orifices exiting at opposite sides of said trailing edge at staggered spaced apart positions symmetrically thereof.
Claim 4
Dependent Claim
28 words
A nozzle as set forth in claim 2 wherein said orifices are directed to discharge from opposite sides of said trailing edge jet streams travelling in divergent directions.
Claim 5
Dependent Claim
41 words
A nozzle as set forth in claim 1 wherein the ratio of the diameters of said orifices to the rate of flow therethrough is such that the velocity of jet stream flow at the orifice exits is less than Mach 1.
Claim 6
Dependent Claim
25 words
A nozzle as set forth in claim 4 wherein the velocity of jet stream flow at the orifice exits is between .6 to .8 Mach.
Claim 7
Dependent Claim
29 words
A nozzle as set forth in claim 4 wherein the rate of jet stream flow at the orifice exits is greater than .5 Mach and less than Mach 1.
Claim 8
Dependent Claim
35 words
A nozzle as set forth in claim 1 wherein said orifice means comprises a plurality of rows of orifices arranged parallel to said trailing edge, said orifices being at staggered spaced apart positions symmetrically thereof.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |