Nested latch thrust reverser
View Patent ↗A thrust reverser includes reverser doors pivotally mounted in a nacelle. Each door includes a latch pin mounted at a distal end thereof. A complementary latch hook is pivotally mounted in the nacelle for engagement with the pin to latch closed the reverser door. A rotary retainer adjoins the hook for blocking rotation of the hook to latch closed the door, and selectively unblock rotation of the hook to permit the pin to disengage the hook.
1. A thrust reverser comprising:
a nacelle having radially outer and inner skins extending axially from a leading edge defining an inlet to a trailing edge defining an outlet;
an outer door disposed in said outer skin, and pivotally mounted at a proximal end to said nacelle;
a latch pin fixedly mounted to a distal end of said door;
a latch hook having a first shaft pivotally mounted to said nacelle for engagement with said pin to latch closed said door in said outer skin; and
a rotary retainer having a second shaft extending transverse to said first shaft and adjoining said hook for blocking rotation of said hook to latch closed said door, and selectively unblocking rotation of said hook to permit said pin to disengage said hook.
2. A reverser according to claim 1 further comprising:
a latch box fixedly mounted to said nacelle, and having an open pocket facing said latch pin; and
said latch hook is pivotally mounted by said first shaft inside said box for carrying reaction loads from said door through said pin, hook, and box into said nacelle.
3. A reverser according to claim 2 wherein said retainer is pivotally mounted by said second shaft to a back wall of said box, and said hook is pivotally mounted by said first shaft between opposite sidewalls of said box.
4. A reverser according to claim 3 wherein:
said latch hook comprises a corner at a forward end thereof, and a slot extending parallel to an outwardly projecting ledge at an aft end thereof for receiving said pin; and
said retainer comprises a back plate having a cam extending in part circumferentially along the perimeter thereof to abut said corner and block rotation of said hook, and terminating at a step to receive said corner and unblock rotation of said hook.
5. A reverser according to claim 4 further comprising means for selectively rotating said retainer to block rotation of said hook to retain said pin in said slot, and unblock rotation of said hook to permit disengagement of said pin from said slot.
6. A reverser according to claim 5 wherein said retainer rotating means comprise:
an arcuate rod extending circumferentially behind said box;
an actuator joined to said rod for selective rotation in opposite circumferential directions around said nacelle; and
linkage joining said rod to said retainer for rotating said retainer in opposite directions corresponding with rotation of said rod.
7. A reverser according to claim 6 wherein said linkage comprises:
a first lever joined to said second shaft extending through said back wall to said back plate;
a bracket extending radially outwardly from said rod; and
a link pivotally joined at opposite ends to said first lever and bracket substantially parallel to said rod.
8. A reverser according to claim 7 wherein:
said rod is mounted to said nacelle in a plurality of guide rollers for circumferential movement therearound; and
said bracket includes a circumferential slot slidingly mounted by a retention roller to said box for preventing tilting of said rod.
9. A reverser according to claim 7 further comprising:
an indicator pin extending radially behind said box; and
a second lever joined at a proximal end to said second shaft, and at a distal end to said pin for extending and retracting said pin from said outer skin as said retainer is rotated to correspondingly unblock and block said latch hook.
10. A reverser according to claim 6 further comprising a spring driven plunger mounted in a bottom wall of said box in engagement with an underside of said ledge to bias outward said latch hook when said step receives said corner.
11. A reverser according to claim 10 further comprising means for selectively deploying open said door and unlatching said pin from said latch hook, and retracting closed said door to engage said pin against said ledge and depress said plunger as said latch hook rotates closed.
12. A thrust reverser comprising:
a nacelle having an inlet and an outlet at opposite axial ends;
a plurality of thrust reverser doors spaced circumferentially apart around said nacelle to close corresponding apertures through said nacelle, each door being hinged at an aft end to said nacelle, and including a latch pin at a forward end;
a plurality of latch boxes disposed at forward ends of respective ones of said apertures;
each latch box including a latch hook pivotally mounted therein for engaging said latch pin to latch closed said door atop said aperture, and a rotary retainer pivotally mounted behind said hook to selectively block and unblock rotary movement of said hook; and
means for rotating in unison said retainers to selectively block and unblock rotary movement of corresponding ones of said hooks.
13. A reverser according to claim 12 wherein said retainer rotating means comprise:
an arcuate control rod extending circumferentially behind said latch boxes;
an actuator joined to said rod for selective rotation in opposite circumferential directions around said nacelle; and
linkage joining said rod to said retainers for rotating said retainers in unison in opposite directions corresponding with rotation of said control rod.
14. A reverser according to claim 13 wherein each of said latch boxes further comprises:
an open pocket facing a corresponding latch pin;
opposite sidewalls pivotally supporting a corresponding latch hook; and
a back wall pivotally supporting said retainer behind said latch hook.
15. A reverser according to claim 14 wherein:
each of said latch hooks comprises a corner at a forward end thereof, and a slot extending parallel to an outwardly projecting ledge at an aft end thereof for receiving said pin; and
each of said retainers comprises a back plate having a cam extending in part circumferentially along the perimeter thereof to abut said corner and block rotation of said hook, and terminating at a step to receive said corner and unblock rotation of said hook.
16. A reverser according to claim 15 wherein said linkage comprises:
a first lever joined to a shaft extending through said back wall to said back plate;
a bracket extending radially outwardly from said rod; and
a link pivotally joined at opposite ends to said first lever and bracket substantially parallel to said rod.
17. A reverser according to claim 16 wherein:
said rod is mounted to said nacelle in a plurality of guide rollers for circumferential movement therearound; and
said bracket includes a circumferential slot slidingly mounted by a retention roller to said box for preventing tilting of said rod.
18. A reverser according to claim 17 further comprising:
an indicator pin extending radially behind each of said latch boxes; and
a second lever joined at a proximal end to said shaft, and at a distal end to corresponding ones of said pins for extending and retracting said pin from said nacelle as said retainers are rotated to correspondingly unblock and block said latch hooks.
19. A reverser according to claim 18 further comprising a spring driven plunger mounted in a bottom wall of each of said boxes in engagement with an underside of said ledges to bias outward said latch hooks when said steps receive said corners.
20. A reverser according to claim 19 further comprising means for selectively deploying open said doors and unlatching said pins from said latch hooks, and retracting closed said doors to engage said pins against said ledges and depress said plungers as said latch hooks rotate closed.