Patent FR2345321A1 successfully refreshed from Google Patents.
US3601992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrust reversing apparatus
Assignee: Rohr Inc
•
Filing: 1970-06-10
•
Granted: 1971-08-31
•
Expires: 1990-06-10
Abstract
Abstract Fan jet engine has cowl surrounding engine and terminating in jet exhaust nozzle. Elongate streamlined shroud surrounds fan and engine to define annular duct for fan air terminating forward of exit end of nozzle. Main body of shroud terminates in transverse plane, and peripherally spaced support struts extend rearwardly to define peripherally spaced outflow passages for diverted fan air. Nozzle ring may be attached to aft ends of support struts to provide unit structure. Set of blocker doors overlie each other in each passage and are pivoted on transverse axes which are spaced fore and aft. All doors in a set are stowed and deployed in unison by an actuator. Aft ends of aft doors when deployed contact cowl and block rearward flow. When deployed, all doors diverge forward to produce cascade effect with forward air flow component. Forward doors do not contact shrouds, and aft end of each succeeding door is closer to the cowl to intercept and deflect different portions of air stream. Forward ends of doors are similarly stepped to deliver reverse thrust air at different radial distances outward of the shroud.
Inventors
- 👤 Richard L Maison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:45
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/64; F02K1/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
297 words
Thrust reversing apparatus for use in combination with a jet engine enclosed in a core cowl and having a compressor fan extending radially beyond the cowl, comprising: a streamlined shroud surrounding the engine and fan and having inner and outer walls spaced from each other throughout at least the major portion of the length of the shroud; the inner wall being radially spaced from the engine cowl to define therewith a generally annular duct for rearward flow of the propulsion air stream delivered by the fan; the shroud terminating forward of the trailing edge of the engine cowl; and a plurality of sets of blocker doors located at the aft end of the shroud; each set including at least two blocker doors each pivotally mounted about a transverse axis with the axes spaced fore and aft; the sets being arranged in spaced relation around the periphery of the shroud; the aft door in each set defining a portion of the contour of the outer wall of the cowl and being swingable to a deployed position diverging forward with its inner end contacting the engine cowl and with its side edges in substantially sealing relation with the adjacent aft doors to block rearward flow of the propulsion air stream and divert it outwardly and forwardly; the door pivoted forwardly of the aft door in each set lying generally parallel to the aft door in stowed position and swinging in unison with the aft door to a deployed position generally parallel to the aft door and with its inner end spaced from the engine cowl; the doors in each set forming a cascade arrangement in deployed position to divide the air stream and to divert all of it laterally outward with a forward component to produce a reverse thrust.
Claim 2
Dependent Claim
297 words
Thrust reversing apparatus for use in combination with a jet engine enclosed in a core cowl and having a compressor fan extending radially beyond the cowl, comprising: a streamlined shroud surrounding the engine and fan and having inner and outer walls spaced from each other throughout at least the major portion of the length of the shroud; the inner wall being radially spaced from the engine cowl to define therewith a generally annular duct for rearward flow of the propulsion air stream delivered by the fan; the shroud terminating forward of the trailing edge of the engine cowl; and a plurality of sets of blocker doors located at the aft end of the shroud; each set including at least two blocker doors each pivotally mounted about a transverse axis with the axes spaced fore and aft; the sets being arranged in spaced relation around the periphery of the shroud; the aft door in each set defining a portion of the contour of the outer wall of the cowl and being swingable to a deployed position diverging forward with its inner end contacting the engine cowl and with its side edges in substantially sealing relation with the adjacent aft doors to block rearward flow of the propulsion air stream and divert it outwardly and forwardly; the door pivoted forwardly of the aft door in each set lying generally parallel to the aft door in stowed position and swinging in unison with the aft door to a deployed position generally parallel to the aft door and with its inner end spaced from the engine cowl; the doors in each set forming a cascade arrangement in deployed position to divide the air stream and to divert all of it laterally outward with a forward component to produce a reverse thrust.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1; the outer ends of the aft door and the door forward thereof in each set extending outward beyond the normal contour of the shroud when in deployed position.
Claim 4
Dependent Claim
37 words
Apparatus as claimed in claim 2; the outer end of the aft door in each set extending outward a substantial distance beyond the outer end of the door forward thereof when the doors are in deployed position.
Claim 5
Dependent Claim
26 words
Apparatus as claimed in claim 1; each set comprising at least three doors mounted with their axes spaced fore and aft to increase the cascade effect.
Claim 6
Dependent Claim
49 words
Apparatus as claimed in claim 1; an actuator connected to one of the doors in each set to swing it between stowed and deployed positions; the doors in the set being interconnected by linkage means to cause them to move in unison in response to operation of the actuator.
Claim 7
Dependent Claim
96 words
Apparatus as claimed in claim 1; including at least three doors in each set; the transverse pivotal mounting of each door being located intermediate the fore and aft ends of the door; a force transmitting link pivotally connected to the leading end of the foremost door and to a locus on the succeeding door forward of the pivotal mounting of the succeeding door; similar linkage connections between all succeeding doors; and an actuator connected to the foremost door to cause all of the doors in the set to move in unison between stowed and deployed positions.
Claim 8
Dependent Claim
80 words
Apparatus as claimed in claim 1; the shroud comprising a main body which is substantially peripherally continuous and which terminates in a transverse plane forward of the sets of doors, and a plurality of support struts extending rearward from the main body and peripherally spaced to define a plurality of outflow passages for the propulsion air stream; one of said sets of doors being located in each of said passages and the doors being pivotally mounted on the support struts.
Claim 9
Dependent Claim
27 words
Apparatus as claimed in claim 7; and a nozzle ring connected to the aft ends of all of the support struts to produce a reinforced unit structure.
Claim 10
Dependent Claim
65 words
Apparatus as claimed in claim 7; at least one door in each set in stowed position defining a portion of the contour of the inner wall of the shroud in the forward end of its respective passage; the aft portion of the inner wall of the aft door defining the remainder of the contour of the inner wall of the shroud in its respective passage.
Claim 11
Dependent Claim
30 words
Apparatus as claimed in claim 9; the outer wall of the aft door defining the contour of the outer wall of the shroud throughout the length of its respective passage.
Claim 12
Dependent Claim
114 words
Apparatus as claimed in claim 7; including at least three doors in each set, the transverse pivotal mounting of each door being located intermediate the fore and aft ends of the door; the foremost door occupying the forward portion of the passage and defining in stowed position a portion of the contour of the inner wall of the shroud; at least one intermediate door having a forward portion outwardly overlying at least part of the foremost door and an aft portion defining a portion of the contour of the inner wall of the shroud when in stowed position; the aft door in stowed position outwardly overlying the remainder of the doors in the set.
Claim 13
Dependent Claim
40 words
Apparatus as claimed in claim 11; each succeeding door in the set from fore to aft having a greater axial extent aft of its respective pivotal mounting to intercept and deflect separate portions of the rearwardly flowing propulsion air stream.
Claim 14
Dependent Claim
46 words
Apparatus as claimed in claim 11; each succeeding door in the set from fore to aft having a greater axial extent forward of its respective pivotal mounting to deliver its respective portion of the deflected air stream at successively greater radial distances outward of the shroud.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |