Failure detection mechanism for selector lever
A selector lever includes a housing with front and rear ends and a lever with a shaft pivotally disposed on a cross-shaft. The shaft defines a shaft axis. The lever has a top that is disposed outside of the housing. A movable shaft moves substantially axially along the shaft axis. A pin, having first and second protrusions, is disposed adjacent to a bottom end of the movable shaft. A first detent plate is disposed on a first side of the movable shaft and includes at least a first slot that receives the first protrusion. A second detent plate is disposed on a second side of the moveable shaft and includes at least a second slot therein receiving the second protrusion. A first failure detection slot is associated with the first slot, permitting movement of the first protrusion therein in the absence of the second protrusion.
1. A selector lever, comprising:
a lever having a shaft pivotally disposed on a cross-shaft in the housing, wherein the shaft defines a shaft axis and wherein the lever has a top that is disposed outside of a housing;
a movable shaft associated with the lever, the movable shaft being movable substantially axially along the shaft axis;
a pin disposed adjacent to a bottom end of the movable shaft, wherein the pin comprises a first protrusion axially opposed to a second protrusion;
a first detent plate disposed on a first side of the movable shaft, the first detent plate including at least a first slot therein for receiving the first protrusion;
a second detent plate disposed on a second side of the moveable shaft, substantially parallel to the first detent plate, the second detent plate including at least a second slot therein for receiving the second protrusion; and
a first failure detection slot within the at least a first slot of the first detent plate for receiving the first protrusion,
wherein abutment of the second protrusion against the second detent plate blocks movement of the first protrusion into the first failure detection slot.
2. The selector lever of claim 1 , further comprising:
a biasing element operatively disposed between the shaft and the movable shaft to bias the movable shaft toward the cross-shaft.
3. The selector lever of claim 1 , further comprising:
a second failure detection slot within the at least a second slot of the second detent plate for receiving the second protrusion,
wherein abutment of the first protrusion against the first detent plate blocks movement of the second protrusion into the second failure detection slot.
4. The selector lever of claim 3 , wherein the second failure detection slot is disposed adjacent to a trough of the second slot.
5. The selector lever of claim 3 , wherein the second failure detection slot is disposed adjacent to a peak of the second slot.
6. The selector lever of claim 3 , wherein the second failure detection slot is disposed between a trough and a peak of the second slot.
7. The selector lever of claim 3 , wherein failure of the first protrusion permits the second protrusion to be received within the second failure detection slot.
8. The selector lever of claim 1 , further comprising a pin release mechanism connected to the movable shaft, permitting manipulation of the movable shaft so that the lever may be transitioned from a locked to an unlocked condition.
9. The selector lever of claim 8 , wherein the top of the lever is cooperative with the pin release mechanism by a hand compression.
10. The selector lever of claim 8 , wherein the pin release mechanism comprises:
a sleeve at least partially surrounding and connected to the movable shaft; and
a T-shaped top end.
11. The selector lever of claim 1 , further comprising a biasing element between the shaft and the movable shaft, wherein the biasing element is a spring.
12. The selector lever of claim 11 , wherein the spring is a coil spring.
13. The selector lever of claim 1 , wherein the first detent plate includes a plurality of slots.
14. The selector lever of claim 1 , wherein the second detent plate includes a plurality of slots.
15. The selector lever of claim 1 , wherein the first failure detection slot is disposed adjacent to a trough of the first slot.
16. The selector lever of claim 1 , wherein the first failure detection slot is disposed adjacent to a peak of the first slot.
17. The selector lever of claim 1 , wherein the first failure detection slot is disposed between a trough and a peak of the first slot.
18. The selector lever of claim 1 , wherein the first slot is disposed adjacent to a rear end of the housing.
19. The selector lever of claim 18 , wherein the second slot is disposed adjacent to a front end of the housing.
20. The selector lever of claim 1 , wherein the first slot is disposed adjacent to a front end of the housing.
21. The selector lever of claim 20 , wherein second slot is disposed adjacent to a rear end of the housing.
22. The selector lever of claim 1 , wherein the first detent plate and the second detent plate have an inverted symmetry with respect to one another.
23. The selector lever of claim 1 , wherein the selector lever provides control for at least one or flaps and slats on an aircraft.
24. The selector lever of claim 1 , further comprising:
a sensor to detect a position of the lever that deviates from a predetermined position.
25. The selector lever of claim 24 , wherein the sensor is associated with the cross-shaft to detect an angular position of the lever.
26. The selector lever of claim 1 , wherein failure of the second protrusion permits the first protrusion to be received within the first failure detection slot.