Abstract:
A selector lever that comprises a shaft rotatably attached to a pivot and arranged between two detent plates, each of the detent plates having a plurality of slots arranged for receiving a detent pin located on the shaft. Each of the plurality of slots on each of the two detent plates is defined by a radial depth. One or more of the plurality of slots is a failure detection slot having an extended radial depth. When one of the detent pins has failed, the opposing detent pin is allowed to travel into the extended radial depth when placed in the failure detection slot. This action reveals a failure indicator, providing a visual indication that one of the detent pins has failed.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present disclosure relates generally to selector levers and, more particularly, to a failure detection mechanism for selector levers that may be found, for example, in the cockpit of an aircraft. 
         [0002]    Conventional aircraft are commonly equipped with a selector lever for manually controlling the actuation of flaps, ailerons, or other moveable features of the aircraft. The selector lever is mounted in the cockpit for the pilot to select the desired equipment configuration by moving the lever to a position corresponding to the desired equipment configuration. The conventional selector lever is typically constructed with a shaft rotatably arranged adjacent one or two detent plates. One or two detent pins corresponding to the detent plates are movably arranged on the shaft. This configuration provides a measure of redundancy that allows the selector lever to be functional after one detent pin has failed. The ability to detect the failure of one or both detent pins would reduce maintenance costs and improve aircraft safety. Accordingly, the industry is receptive to new developments that provide the capability to detect the failure of a detent pin. 
       SUMMARY OF THE INVENTION 
       [0003]    Disclosed herein is a selector lever that includes a shaft rotatably attached to a pivot. The pivot is disposed in a housing and the shaft extends from the housing. A slide is movably arranged on the shaft. First and second detent pins are operatively connected to the slide. A first detent plate is disposed in the housing having a first plurality of slots for receiving the first detent pin, each of the first plurality of slots having a first radial depth. At least one of the first plurality of slots is a first failure detection slot defined by a first extended radial depth that is greater than the first radial depth. A second detent plate is disposed in the housing having a second plurality of slots for receiving the second detent pin. At least one of the second plurality of slots is a second failure detection slot defined by a second extended radial depth that is greater than the second radial depth. A failure indicator is arranged to provide a visual indication when the either of the first or second detent pins enters the first or second extended radial depths, respectively. 
         [0004]    Another aspect of the disclosure provides a selector lever for actuating features of an aircraft. The selector lever includes a housing with a pivot disposed in the housing. A shaft is also arranged in the housing, a proximal end of the shaft being rotatably attached to the pivot with a distal end of the shaft extending from the housing. A slide is arranged to move along the shaft with first and second detent pins connected to the slide. A first detent plate is disposed in the housing having a first plurality of slots for receiving the first detent pin, each of the first plurality of slots having a first radial depth. At least one of the first plurality of slots is a first failure detection slot defined by a first extended radial depth that is greater than the first radial depth. A second detent plate is disposed in the housing having a second plurality of slots for receiving the second detent pin. A failure indicator is configured to provide a visual indication when the first pin is placed in the first failure detection slot 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike: 
           [0006]      FIG. 1  is an illustration of an aircraft according to one embodiment; 
           [0007]      FIGS. 2A and 2B  are opposing sectioned side views of a selector lever according to another embodiment; 
           [0008]      FIG. 2C  is a sectioned side view of the selector lever shown in  FIGS. 2A and 2B ; 
           [0009]      FIGS. 2D and 2E  are side views of detent plates of the selector lever shown in  FIGS. 2A and 2B ; 
           [0010]      FIGS. 3A and 3B  are opposing sectioned side views of the selector lever shown in  FIGS. 2A and 2B  in another position; 
           [0011]      FIGS. 4A and 4B  are opposing sectioned side views of the selector lever shown in  FIGS. 2A and 2B  in another position; 
           [0012]      FIGS. 5A and 5B  are opposing sectioned side views of the selector lever shown in  FIGS. 2A and 2B  in another position; and 
           [0013]      FIG. 6  is a sectioned side view of a selector lever according to another embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0014]    A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures. It is to be understood that other embodiments may be utilized and changes may be made without departing from the scope of the present disclosure. In particular, the disclosure provides various examples related to a selector lever for aircraft, whereas the advantages of the present disclosure as applied in a related field would be apparent to one having ordinary skill in the art and are considered to be within the scope of the present invention. 
         [0015]      FIG. 1  shows a top view of an aircraft  100  having an aircraft actuator system that employs the selector lever of the present disclosure. For example, the selector lever of the aircraft actuator system may be used to control the position of a plurality of flaps  102  located on the wings  101  of the aircraft  100 . The selector lever allows the operator (or pilot) to accurately control the position of the flaps  102  from the cockpit  103 . 
         [0016]      FIG. 2A  is a sectioned side view of a selector lever  1  according to one embodiment of the present disclosure.  FIG. 2B  is a sectioned side view of the selector lever  1  shown in  FIG. 2A , from an opposing view. The selector lever  1  includes a shaft  2  having a proximal end  3  that is rotatably attached to a pivot  4  that is disposed in a housing  5 . The shaft  2  also comprises a distal end  6  that extends from the housing  5 . A slide  7  is arranged to move along the shaft  2 , the slide  7  at least partially extending from the housing  5 . 
         [0017]      FIG. 2A  shows a first detent plate  8  with a first plurality of slots  9  disposed in the housing  5  parallel to the path of the pivoting shaft  2 .  FIG. 2B  shows a second detent plate  10  with a second plurality of slots  11  disposed in the housing  5  parallel to the path of the pivoting shaft  2 , opposite from the first detent plate  8 . 
         [0018]      FIG. 2A  shows a first detent pin  12  arranged on the shaft  2  to engage the first plurality of slots  9  of the first detent plate  8 . The first detent pin  12  is operatively connected to the slide  7  such that translational movement of the slide  7  along the shaft results in movement of the first detent pin  12 . Similarly,  FIG. 2B  shows a second detent pin  13  arranged on the shaft  2  to engage the second plurality of slots  11  of the second detent plate  10 , the second detent pin  13  being operatively connected to the slide  7 . 
         [0019]      FIG. 2C  shows a sectioned side view of the shaft  2  of the selector lever  1  shown in  FIGS. 2A and 2B . As shown in  FIG. 2C , the slide  7  may be connected to a connecting member  14  disposed internal to the shaft  2 . The first and second detent pins  12 ,  13 , (second detent pin  13  not shown in  FIG. 2C ), may be connected to the connecting member  14 . Alternatively, the first and second detent pins  12 ,  13  may be directly connected to the slide  7 . A biasing element  15 , (e.g., a spring), may also be provided to bias the first and second detent pins  12 ,  13  into the respective slots. 
         [0020]    As shown in  FIG. 2A , one or more of the first plurality of slots  9  may be configured as a first failure detection slot  16 .  FIGS. 2D and 2E  show the first and second detent plates  8 ,  10 , respectively, in greater detail. As shown in  FIG. 2D , the first failure detection slot  16  is characterized by a first extended radial depth E 1  that is greater than a first radial depth D 1  of the remaining of the first plurality of slots  9 . As further shown in  FIG. 2E , one or more of the second plurality of slots  11  may be configured as a second failure detection slot  17 , which is characterized by a second extended radial depth E 2  that is greater than a second radial depth D 2  of the remaining of the second plurality of slots  11 . The “remaining” of the first or second plurality of slots  9 ,  11  is defined to include those of the slots that are not configured to be a failure detection slot. The “radial depth” is defined as the radial distance that would be travelled by the respective detent pin  12 ,  13  along the shaft  2 , i.e., the change in distance from the pivot  4 . For example, where one of the slots is set at an angle such that the insertion of the respective detent pin would require the simultaneous rotation of the shaft  2 , the radial depth measures only the radial aspect of such movement. Similarly, the “extended radial depth” denotes that the failure detection slot has a radial aspect that is greater than the nominal radial depth of the plurality of slots in the same detent plate. In this example, the first and second extended radial depths E 1 , E 2  are radially inward from the first and second depths D 1 , D 2 . 
         [0021]      FIGS. 2A and 2B  also show the location of a failure indicator  18 . The failure indicator  18  is positioned on the shaft  2  to be concealed by the slide  7  until the first or section detent pins  12 ,  13  enters the first or second extended radial depth E 1 , E 2  of one of the respective first or second failure detection slots  16 ,  17  (see  FIGS. 5A and 5B ). As further discussed below, the failure indicator  18  thereby provides a visual indication to the operator that one of the first or second detent pins  12 ,  13  has failed. The selector lever  1  may also comprise a normal indicator  19 , positioned on the shaft  2  to be visible until the first or section detent pins  12 ,  13  enters the first or second extended radial depth E 1 , E 2  of one of the respective first or second failure detection slots  16 ,  17 . 
         [0022]    In operation, the operator moves the selector lever  1  from one position to another by first moving the slide  7  along the shaft  2  to disengage the first and second detent pins  12 ,  13  from the respective slot.  FIGS. 3A and 3B  illustrate the embodiment shown in  FIGS. 2A and 2B  with the pins  12 ,  13  disengaged from the slot as described. The normal indicator  19  remains visible in this position while the failure indicator  18  remains concealed. Next, the operator rotates the shaft  2  to the desired position. Then, the operator moves the slide  7  along the shaft  2  in a direction allowing the first and second detent pins  12 ,  13  to engage the desired slot.  FIGS. 4A and 4B  illustrate the selector lever  1  of  FIGS. 2A and 2B , with the shaft  2  in the desired position with the first detent pin  12  engaging the first failure detection slot  16  and the second detent pin  13  engaging one of the remaining of the second plurality of slots  11 .  FIGS. 4A and 4B  illustrate the selector lever  1  with at least the second detent pin  13  intact, wherein the first detent pin  12  enters the first failure detection slot  16 , but does not enter the first extended radial depth E 1 . Accordingly, the failure indicator  18  remains concealed in  FIGS. 4A and 4B . 
         [0023]      FIGS. 5A and 5B  illustrate the selector lever  1  of  FIGS. 2A and 2B , with the shaft  2  in the position shown in  FIGS. 4A and 4B , where the second detent pin  13  has failed. Without the second detent pin  13  engaging the respective one of the second plurality of slots  11 , the first detent pin  12  is biased by the biasing element  15 , (see  FIG. 2C ), into the first extended radial depth E 1  of the first failure detection slot  16 . This position moves the slide  7  further along the shaft  2 , exposing the failure indicator  18  and concealing the normal indicator  19 . In a similar manner, a failure of the first detent pin  12  would allow the second detent pin  13  to be biased into the second extended radial depth E 2  by the biasing element  15 , (see  FIG. 2C ), when the shaft  2  is position to move the second detent pin  13  into the one or more second failure detection slot  17 S. As may be apparent, each of the first and second failure detection slots  16 ,  17  should be arranged opposing one of the remaining of the respective plurality of slots in the opposing detent plate. 
         [0024]    As described above, the present disclosure provides a visual indication of a detent pin failure during the normal operation of the selector lever  1 . The failure indication may be provided at one or more positions of the selector lever  1 . For example, each incremental position of the selector lever  1 , (for which a pair of corresponding slots has been provided, one in each detent plate), may include one first or second failure detection slot  16 ,  17 . Also, the present disclosure provides a positive indication confirming that at least one of the detent pins remains intact. 
         [0025]    As those in the art will ascertain, the features described above are merely exemplary and may be provided in many forms to achieve some or all of the advantages herein. For example,  FIG. 6  illustrates a sectioned side view of the selector lever  1  according to another example of the present disclosure, in which the direction moved by the first detent pin  12  to engage one of the first plurality of slots  9  is radially outward, i.e., away from the pivot  4 . In contrast with the embodiment of  FIGS. 2A and 2B , the slide  7  is moved in a radially inward direction to disengage the first detent pin  12  from the first detent plate  8 . It follows that the first extended radial depth E 1  is radially outward from the first radial depth D 1  in this configuration. Also, in the embodiment shown in  FIG. 6 , the failure indicator  18  is disposed on the connecting member  14 , normally concealed by the distal end  6  of the shaft  2 . 
         [0026]    Other configurations are also possible without departing from the scope of the present disclosure. For example, the selector lever may be provided with markings on the housing to indicate which of the first and second detent pins has failed in the event of a failure indication. 
         [0027]    While the invention has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Also, in the drawings and the description, there have been disclosed exemplary embodiments of the invention and, although specific terms may have been employed, they are unless otherwise stated used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention therefore not being so limited. Moreover, the use of the terms first, second, etc., do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.