US3655008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound suppressing apparatus
Assignee: Rohr Inc
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Filing: 1971-01-28
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Granted: 1972-04-11
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Expires: 1991-01-28
Abstract
Abstract Elongate noise reflecting and suppressing shield of upwardly concave cross section is carried by engine housing in generally horizontal attitude. Forward end of shield has pivotal mounting means on transverse axis which move fore and aft on tracks carried by housing. Aft end of shield is maintained against downward swinging by cables attached to its aft end and trained over pulleys on free end of mast pivotally mounted on wing over nozzle exit. Forward ends of cables are connected to servo motor. Mast is swingable down flush with wing for cruise flight and deployed to upright position for takeoff and low level flight. When drive means moves pivotal mounting means aft to deploy shield to position beneath and intercepting jet stream. the servo motor pays out cables at proper rate to maintain attitude of shield substantially constant. When shield is fully deployed, aerodynamic reaction means on aft end of shield raise it in response to relative wind to the proper interception angle to produce maximum noise reduction.
Inventors
- 👤 Victor Millman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/44; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
204 words
Sound suppressing apparatus for use in combination with an aircraft propelled by a jet engine, comprising: a housing surrounding a jet engine having a rearwardly discharging jet nozzle; an elongate noise reflecting and suppressing shield having an upwardly concave cross section and arranged in a generally horizontal fore and aft attitude; pivotal mounting means at the forward end of the shield engaging a portion of the housing to support the shield for swinging about a generally horizontal axis transverse to the axis of the nozzle; drive means to move the pivotal mounting means fore and aft on the housing to move the shield between stowed position forward of the nozzle exit and deployed position extending aft with its forward end adjacent to the nozzle exit to underlie and intercept the lower portion of the jet stream issuing from the nozzle; and extensible and retractable support means associated with the housing and connected to the aft end of the shield to restrain the shield against downward swinging about its pivotal mounting means; the support means being extensible and retractable in conjunction with fore and aft movement of the pivotal mounting means to maintain the attitude of the shield substantially constant at all stages of deployment.
Claim 2
Dependent Claim
204 words
Sound suppressing apparatus for use in combination with an aircraft propelled by a jet engine, comprising: a housing surrounding a jet engine having a rearwardly discharging jet nozzle; an elongate noise reflecting and suppressing shield having an upwardly concave cross section and arranged in a generally horizontal fore and aft attitude; pivotal mounting means at the forward end of the shield engaging a portion of the housing to support the shield for swinging about a generally horizontal axis transverse to the axis of the nozzle; drive means to move the pivotal mounting means fore and aft on the housing to move the shield between stowed position forward of the nozzle exit and deployed position extending aft with its forward end adjacent to the nozzle exit to underlie and intercept the lower portion of the jet stream issuing from the nozzle; and extensible and retractable support means associated with the housing and connected to the aft end of the shield to restrain the shield against downward swinging about its pivotal mounting means; the support means being extensible and retractable in conjunction with fore and aft movement of the pivotal mounting means to maintain the attitude of the shield substantially constant at all stages of deployment.
Claim 3
Dependent Claim
38 words
Apparatus as claimed in claim 1; the support means being extensible and retractable independently of the drive means to raise and lower the aft end of the shield and vary its angle of interception of the jet stream.
Claim 4
Dependent Claim
52 words
Apparatus as claimed in claim 1; the support means being further extensible to lower the aft end of the shield; and aerodynamic reaction means attached to the aft portion of the shield to swing it upward to predetermined angles of interception in response to relative wind forces on the aerodynamic reaction means.
Claim 5
Dependent Claim
51 words
Apparatus as claimed in claim 1; the support means including guide means located above the nozzle exit; elongate flexible tension means connected at one end to the aft end of shield and extending up over the guide means; and a servo motor connected to the other end of the tension means.
Claim 6
Dependent Claim
53 words
Apparatus as claimed in claim 4; the guide means including a mast retractable to a position substantially out of the air stream and extensible to a position with its free end above the nozzle exit; and guide members at the free end of the mast; the tension means extending over the guide members.
Claim 7
Dependent Claim
34 words
Apparatus as claimed in claim 5; the mast being pivoted about an axis transverse to the nozzle axis to swing downward and forward to retracted position and upward and rearward to extended operative position.
Claim 8
Dependent Claim
53 words
Apparatus as claimed in claim 5; a wing located above and connected to the housing; the mast being pivotally mounted on the wing about an axis transverse to the nozzle axis for swinging between a retracted position substantially flush with the wing and an extended position directed upward and away from the wing.
Claim 9
Dependent Claim
25 words
Apparatus as claimed in claim 7; the wing being provided with a recess in its aft portion; and the mast being retractable into the recess.
Claim 10
Dependent Claim
26 words
ApparaTus as claimed in claim 7; and stop means carried by the wing and engageable by the mast to limit the amount of its angular extension.
Claim 11
Dependent Claim
123 words
Apparatus as claimed in claim 1; the support means including a mast having a first end pivotally mounted above the nozzle exit on an axis transverse to the nozzle axis and swingable downward and forward to retracted position substantially out of the air stream and swingable upward and aft to operative position; a pair of pulleys at the second, free end of the mast rotatable on an axis parallel to the pivotal axis of the mast; a pair of tension cables each connected at one to the aft end of the shield and extending upward and over the pulleys; and a servo motor connected to the other ends of the cables to extend and retract them during deployment and stowing of the shield.
Claim 12
Dependent Claim
28 words
Apparatus as claimed in claim 10; a wing located above and connected to the housing; and the mast being pivotally mounted on the aft portion of the wing.
Claim 13
Dependent Claim
50 words
Apparatus as claimed in claim 10; and a second pair of pulleys rotatably mounted substantially at the pivotal mounting of the mast; the cables being further trained about the second pair of pulleys to minimize change in the effective length of the cables during stowing and deployment of the mast.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |