US3600894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrust reversing apparatus
Assignee: Rohr Inc
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Filing: 1970-04-28
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Granted: 1971-08-24
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Expires: 1990-04-28
Abstract
Abstract Front fan jet engine has cowl surrounding engine and terminating in jet exhaust nozzle. Elongate shroud surrounds fan and engine to define annular duct for fan air terminating forward of exit end of nozzle. Shroud is divided near aft end into forward section and aft section spaced rearward to define annular outflow passage. Sleeve is stowed position overlies outer end of passage to block flow and deploys axially rearward to permit flow. Blocker doors pivoted at their aft ends to forward end of aft section close inner end of passage when stowed and swing to converge inwardly and contact cowl to block flow through aft section and divert it through passage. Ramps pivoted at their aft ends to intermediate point of doors and at their forward ends to forward end of sleeve act as links to move doors in response to movement of sleeve and deploy to diverge forwardly and redirect airstream with forward component to produce reverse thrust. Leading edge of sleeve forms annular end plate to increase forward flow component of exiting airstream.
Inventors
- 👤 Charles R Mcclain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:51
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/64; F02K1/70; F02K1/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
272 words
Thrust-reversing apparatus for use in combination with a jet engine enclosed in a core cowl and having a compressor fan at its forward end, comprising: a streamlined shroud surrounding the engine and having radially spaced inner and outer walls, the inner wall being radially spaced from the engine cowl to define therewith a generally annular duct for rearward flow of the propulsion airstream delivered by the fan; the inner and outer walls of the shroud converging aft to form a streamlined trailing edge forward of the trailing edge of the engine cowl; the shroud being divided into a forward section and an aft section axially spaced rearward thereof to define between them a substantially continuous laterally directed peripheral outflow passage through the inner and outer walls; closure means for the outer end of said passage movable between stowed and deployed positions to block or permit flow through the passage; a plurality of blocker doors arranged adjacent to each other around the periphery of the shroud and each pivotally connected at its aft end to the forward end of the shroud aft section; said doors being swingable inwardly to converge forwardly with their forward ends in contact with the engine cowl and their side edges in substantial sealing relation to block rearward flow of air through the shroud aft section; and a plurality of air-diverting ramps pivotally connected at their aft ends to intermediate points on the blocker doors and swingable to outwardly and forwardly diverging positions to intercept the airstream diverted by the blocker doors and direct it laterally outward through the passage with a forward flow component to produce reverse thrust.
Claim 2
Dependent Claim
272 words
Thrust-reversing apparatus for use in combination with a jet engine enclosed in a core cowl and having a compressor fan at its forward end, comprising: a streamlined shroud surrounding the engine and having radially spaced inner and outer walls, the inner wall being radially spaced from the engine cowl to define therewith a generally annular duct for rearward flow of the propulsion airstream delivered by the fan; the inner and outer walls of the shroud converging aft to form a streamlined trailing edge forward of the trailing edge of the engine cowl; the shroud being divided into a forward section and an aft section axially spaced rearward thereof to define between them a substantially continuous laterally directed peripheral outflow passage through the inner and outer walls; closure means for the outer end of said passage movable between stowed and deployed positions to block or permit flow through the passage; a plurality of blocker doors arranged adjacent to each other around the periphery of the shroud and each pivotally connected at its aft end to the forward end of the shroud aft section; said doors being swingable inwardly to converge forwardly with their forward ends in contact with the engine cowl and their side edges in substantial sealing relation to block rearward flow of air through the shroud aft section; and a plurality of air-diverting ramps pivotally connected at their aft ends to intermediate points on the blocker doors and swingable to outwardly and forwardly diverging positions to intercept the airstream diverted by the blocker doors and direct it laterally outward through the passage with a forward flow component to produce reverse thrust.
Claim 3
Dependent Claim
85 words
Apparatus as claimed in claim 1; the closure means in stowed position defining the contour of the outer wall of the shroud between the forward section and the aft section; the blocker doors in stowed position defining the contour of the inner wall of the shroud between the forward section and the aft section and closing the inner end of the passage; and the ramps in stowed position lying in the passage between the closure means and the blocker doors and out of the airstream.
Claim 4
Dependent Claim
75 words
Apparatus as claimed in claim 1; the closure means being axially movable from a forward stowed position to an aft deployed position; and the forward ends of said ramps being pivotally connected to the forward end of the closure means and serving as force transmitting links between the closure means and the blocker doors to cause the blocker doors to move between stowed and deployed position in accordance with the movement of the closure means.
Claim 5
Dependent Claim
39 words
Apparatus as claimed in claim 3; the closure means being in the form of a sleeve overlying the outer end of the passage when in stowed position to block both inward and outward flow of air through the passage.
Claim 6
Dependent Claim
46 words
Apparatus as claimed in claim 1; and an annular torque box structure located within the forward end of the passage and provided with a smooth reversely bent skin defining the forward wall of the passage to facilitate gradual reversal of the airstream exiting through the passage.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 5; and a plurality of support struts extending axially between the torque box structure and the aft section; the struts being spaced peripherally around the shroud to lie between adjacent sets of blocker doors and ramps.
Claim 8
Dependent Claim
153 words
Apparatus as claimed in claim 1; the closure means being in the form of a sleeve overlying the outer end of the passage when in stowed position to block both inward and outward flow of air through the passage and defining the contour of the outer wall of the shroud between the forward section and the aft sectioN; the sleeve being movable axially rearward to uncover the outer end of the passage; the blocker doors in stowed position defining the contour of the inner wall of the shroud between the forward section and the aft section and closing the inner end of the passage; and the forward ends of said ramps being pivotally connected to the forward end of the sleeve and serving as force transmitting links between the blocker doors and the sleeve to cause the blocker doors to move between stowed and deployed position in response to movement of the sleeve.
Claim 9
Dependent Claim
69 words
Apparatus as claimed in claim 7; the leading edge of the sleeve extending forward of the pivotal connections of the ramps to the sleeve to define an annular end plate for the ramps in deployed position extending forward of the outer ends of the ramps at an angle of approximately 90* to greatly increase the forward flow component of the exiting airstream and correspondingly increase the reverse thrust effect.
Claim 10
Dependent Claim
208 words
Thrust reversing apparatus for use in combination with a jet engine, comprising: a streamlined shroud surrounding the engine and having radially spaced inner and outer walls; the inner and outer walls of the shroud converging aft to form a streamlined trailing edge; the shroud being divided into a forward section and an aft section spaced rearward thereof to define between them a substantially continuous laterally directed peripheral outflow passage through the inner and outer walls; closure means for the outer end of said passage movable between stowed and deployed positions to block or permit flow through the passage; a plurality of blocker doors arranged adjacent to each other around the periphery of the shroud and each pivotally connected at its aft end to the forward end of the shroud aft section; said doors being swingable inward to converge forwardly in substantial sealing relation to block rearward flow of gases through the shroud aft section; and a plurality of air-diverting ramps pivotally connected at their aft ends to intermediate points on the blocker doors and swingable to outwardly and forwardly diverging positions to intercept the gas stream diverted by the blocker doors and direct it laterally outward through the passage with a forward flow component to produce reverse thrust.
Claim 11
Dependent Claim
208 words
Thrust reversing apparatus for use in combination with a jet engine, comprising: a streamlined shroud surrounding the engine and having radially spaced inner and outer walls; the inner and outer walls of the shroud converging aft to form a streamlined trailing edge; the shroud being divided into a forward section and an aft section spaced rearward thereof to define between them a substantially continuous laterally directed peripheral outflow passage through the inner and outer walls; closure means for the outer end of said passage movable between stowed and deployed positions to block or permit flow through the passage; a plurality of blocker doors arranged adjacent to each other around the periphery of the shroud and each pivotally connected at its aft end to the forward end of the shroud aft section; said doors being swingable inward to converge forwardly in substantial sealing relation to block rearward flow of gases through the shroud aft section; and a plurality of air-diverting ramps pivotally connected at their aft ends to intermediate points on the blocker doors and swingable to outwardly and forwardly diverging positions to intercept the gas stream diverted by the blocker doors and direct it laterally outward through the passage with a forward flow component to produce reverse thrust.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |