Door Handle Assembly

Abstract

A handle assembly for engaging and disengaging a locking or securing device. The assembly comprises an actuator, and a rotatable exterior handle. In use, the exterior handle rotates the actuator to engage or disengage the locking or securing device. The exterior handle is structured to only rotate and engage the actuator when the exterior handle is removed from its retracted position into its extended position.

Claims

1. A handle assembly for engaging and disengaging a locking device, the handle assembly comprising: an actuator, comprising a slot having a track, and structured to drive the actuator to engage or disengage a locking mechanism when rotated; and a rotatable exterior handle, comprising a cam follower pin engaged with track in the slot, and having an extended position and a retracted position, the rotatable exterior handle coupled to the actuator and structured to rotate and drive the actuator only when in the extended position, as guided by the slot.

2. The handle assembly of claim 1, further comprising a housing pan, mounted into an exterior side of a door or access, the housing pan having a recess and structured to receive and store the rotatable exterior handle.

3. The handle assembly of claim 1, further comprising a spring, coupled to the rotatable exterior handle for returning the rotatable exterior handle to the retracted position from the extended position, as guided by the track of the slot.

4. The handle assembly of claim 3, wherein the spring, is also structured to return the rotatable exterior handle to an unrotated position when returning the rotatable exterior handle to the retracted position, as guided by the track of the slot

5. The handle assembly of claim 1, wherein the actuator further comprises an interior handle for rotating the actuator from an interior side of a door or recess.

6. The handle assembly of claim 5, wherein the rotational axis of the exterior handle is the same as the rotational axis of the interior handle.

7. The handle assembly of claim 1, wherein the rotatable exterior handle further comprises a shaft about which the handle rotates.

8. The handle assembly of claim 7, wherein the actuator further comprises a hollow intermediate shaft containing the slot, coaxially disposed around the rotatable exterior shaft, and wherein the hollow intermediate shaft is structured to prevent rotation of the rotatable exterior handle when the rotatable exterior handle is in the retracted position when the cam follower pin engages one end of the track.

9. The handle assembly of claim 2, wherein the housing pan is structured such that the rotatable exterior handle sits flush with an exterior side of the door or access within the recess when the rotatable exterior handle is in the retracted position.

10. A handle assembly for engaging and disengaging a locking device, the handle assembly comprising: an actuator, comprising a slot having a track, and structured to drive the actuator to engage or disengage a locking mechanism when rotated; and a rotatable exterior handle, comprising a cam follower pin engaged with track in the slot, and having an extended position and a retracted position, the rotatable exterior handle coupled to the actuator and structured to rotate and drive the actuator only when transitioning from the retracted position to the extended position, as guided by the slot.

11. The handle assembly of claim 10, further comprising a housing pan, mounted into an exterior side of a door or access, the housing pan having a recess and structured to receive and store the rotatable exterior handle.

12. The handle assembly of claim 10, further comprising a spring, coupled to the rotatable exterior handle for returning the rotatable exterior handle to the retracted position from the extended position, as guided by the track of the slot.

13. The handle assembly of claim 12, wherein the spring, is also structured to return the rotatable exterior handle to an unrotated position when returning the rotatable exterior handle to the retracted position, as guided by the track of the slot

14. The handle assembly of claim 10, wherein the actuator further comprises an interior handle for rotating the actuator from an interior side of a door or recess.

15. The handle assembly of claim 14, wherein the rotational axis of the exterior handle is the same as the rotational axis of the interior handle.

16. The handle assembly of claim 10, wherein the rotatable exterior handle further comprises a shaft about which the handle rotates.

17. The handle assembly of claim 16, wherein the actuator further comprises a hollow intermediate shaft containing the slot, coaxially disposed around the rotatable exterior shaft, and wherein the hollow intermediate shaft is structured to prevent rotation of the rotatable exterior handle when the rotatable exterior handle is in the retracted position when the cam follower pin engages one end of the track.

18. The handle assembly of claim 11, wherein the housing pan is structured such that the rotatable exterior handle sits flush with an exterior side of the door or access within the recess when the rotatable exterior handle is in the retracted position.

19. A handle assembly for engaging and disengaging a locking device, the handle assembly comprising: an actuator, comprising a slot having a track, and structured to drive the actuator to engage or disengage a locking mechanism when rotated; and a rotatable exterior handle, comprising a cam follower pin engaged with track in the slot, and having an extended position and a retracted position, the rotatable exterior handle being coupled to the actuator and structured to rotate and drive the actuator only when the rotatable exterior handle is not in the retracted position, as guided by the slot.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a perspective view showing the inside of an aircraft door assembly in which the door handle assembly of this invention is employed.

[0018] FIG. 2 is a perspective view in partial cutaway showing the handle assembly of this invention installed into an aircraft door when viewed from the inside.

[0019] FIG. 3 is a top view of the handle assembly as viewed if installed to the aircraft door looking from the outside of the door.

[0020] FIG. 4 is a side view of the handle assembly which can be derived as the front view of FIG. 3.

[0021] FIG. 5 is a cross-sectional view of the aircraft door assembly of this invention illustrating the view noted in FIG. 3 when the outside handle is stored and the stop pin fitting is in the axial slot of the inner shaft.

[0022] FIG. 6 is a cross-sectional view of the aircraft door assembly of this invention illustrating the view noted in FIG. 4 when the outside handle is stored and the inner shaft pins with integral bearing are at the retracted position in the curved grooves of the central intermediate shaft.

[0023] FIG. 7 illustrates a cross section view of the handle assembly.

[0024] FIG. 8a illustrates a perspective view of the Flush Door Latch Assembly.

[0025] FIG. 8b illustrates another perspective view of the Flush Door Latch Assembly.

[0026] FIG. 8c illustrates a further perspective view of the Flush Door Latch Assembly.

[0027] FIG. 9 illustrates a perspective view of an aircraft door assembly to which one embodiment of a handle assembly of this invention is attached.

[0028] FIG. 10 illustrates a perspective view in partial cutaway showing the handle assembly of this invention installed into an aircraft door when viewed from the inside.

[0029] FIG. 11 illustrates a top view of the handle assembly as viewed if installed to the aircraft door looking normally to the outside of the door.

[0030] FIG. 12 illustrates a cross-sectional view of the aircraft door assembly of this invention illustrating the view noted in FIG. 11 when the outside handle is stowed.

[0031] FIG. 13 illustrates a cross-sectional view of the aircraft door assembly of this invention illustrating the view noted in FIG. 11 when the outside handle is stowed.

[0032] FIG. 14a illustrates a perspective view showing the components in the extended and stowed positions.

[0033] FIG. 14b illustrates another perspective view showing the components in the extended and stowed positions.

[0034] FIG. 15a illustrates a perspective view showing the primary components of the flush door latch assembly.

[0035] FIG. 15b illustrates another perspective view showing the primary components of the flush door latch assembly.

[0036] FIG. 16 illustrates a cross section view of the flush door latch assembly.

[0037] FIG. 17a is a perspective view of the flush door latch assembly.

[0038] FIG. 17b is another perspective view of the flush door latch assembly.

[0039] FIG. 17c is a further perspective view of the flush door latch assembly.

[0040] FIG. 17d is a further perspective view of the flush door latch assembly.

DETAILED DESCRIPTION OF THE FIRST EMBODIMENT OF THE INVENTION

[0041] The following detailed description is one embodiment of the current invention. The description is not to be taken in a limiting sense, but is made for at least the purpose of illustrating the general principles of the invention, since the scope of the invention is best defined by the appended claims.

[0042] In the first embodiment of invention, a door handle assembly is used to control the latch mechanism of an aircraft door so that the door can be opened or closed from either the inside or outside the aircraft. The door handle assembly includes an outer shaft assembly that is connected to the latch mechanism so as to control the opening and closing of the door, an inner shaft assembly that is overlapped by a housing body and cylindrical housing shaft assembly on whose outer diameter the outer shaft assembly rotates. The cylindrical housing shaft has curved slots that control the motion of the inner shaft assembly so that the inner shaft assembly can only be rotated after it is telescopically extended outward from the cylindrical housing shaft by a fixed amount. Further, an interior handle is attached to the outer shaft assembly so as to rotate the outer shaft assembly. The interior handle is also referred to as the internal handle or the inside handle.

[0043] In a typical embodiment, the door handle assembly is provisioned to accept an interior handle provided by an installer of door handle assembly. Rotation of the inner shaft assembly is controlled by an exterior handle assembly attached thereto. The inner shaft assembly and outer shaft assembly are connected by a stop pin fitting that is attached to the outer body of the outer shaft assembly and passes through the cylindrical housing shaft into an axial slot feature of the inner shaft. The axial slot of the inner shaft is terminated by a circumferential slot feature. When the exterior handle is extended, its motion is positively controlled by two pin shafts mounted to it with each pin shaft having an integral bearing that follow the path of the slots in the cylindrical housing shaft. The exterior handle can rotate the outer shaft assembly and interior handle by its connection to the inner shaft assembly and stop pin fitting that is fixed to the outer shaft assembly.

[0044] Referring now to the drawings, FIG. 1 is a perspective view of an aircraft door assembly 10 to which one embodiment of a handle assembly 12 of this invention is attached. The door assembly 10 includes a door 14 fitted into an opening 16 formed inside an aircraft fuselage 18. A hinge 20 connects the door 14 to the inside of the fuselage 18 so that the door can move between open and closed positions. The sides of the door 14 are provided with a number of outwardly extending door stops 22, and the fuselage 18 is provided with a number of flanges 24 that project into the opening 16 adjacent the door stops. When the aircraft is in flight, high cabin pressure inside the fuselage 18, in comparison to lower atmospheric pressure, urges the door 14 outwards so that door stops 22 abut the fuselage flanges 24 and seal the door shut. The opening and closing of the door 14 is controlled by a roller cam and track mechanism 26. When the door 14 is closed, the roller cam and track mechanism 26 control the travel of the door so that the door stops 22 move into a position slightly below and in front of the fuselage flanges 24. After the door stops are adjacent to the fuselage flanges 24, the roller cam and track mechanism pull the door 14 outwards toward the aircraft fuselage 18 so that the door stops on the fuselage stop. When the door 14 is opened, the roller cam and track mechanism 26 first lift the door upwards slightly and inwards so that the door stops 22 clear the fuselage flanges 24 so that in turn, the door 14 can be moved upwards to the full open position. The upwards movement of the door 14 to its open position is assisted by a spring-loaded counterbalance mechanism 88 that pulls the door upwards. The actuation of the roller cam and track mechanism 26 is controlled by the handle assembly 12 as will be described hereinafter. The handle assembly 12 is typically provisioned to accept the attachment of an inside handle 28 so that actuation of the roller cam and track mechanism 26 and the opening and closing of the aircraft door 14 can be controlled from inside the aircraft.

[0045] The counterbalance mechanism 88 comprises a pulley and cable assembly 32 that has the pulley 89 spring loaded and fixed to the door 14. The pulley 89 is connected to the fuselage floor beam 90 by a steel cable 91. When the roller cam and track mechanism 26 release the door from the closed position, the force of the spring loaded pulley 32 acts on the pulley cable 91. The pulley cable 91 reacts to pull the door upward and inward toward the fuselage floor beam 90 until the door rests on a stop pad 94 attached to the fuselage floor beam 90.

[0046] As depicted in FIG. 2, the handle assembly 12 of this invention includes an outside handle 52 that is normally seated flush with the outer skin 54 of the aircraft door 14. The outside handle 52 is also referred to as the external handle 52 or the exterior handle 52. An inner shaft 56 that extends through the door 14 is attached to the outside handle 52. The inner shaft 56 is fully covered by a cylindrical part of the housing body 77. The cylindrical part of the housing body 77 is covered by an outer shaft 58 to which both the inside handle 28, and the cam and track mechanism 26 are connected. The outer shaft 58 is fixed in place. It can rotate but it cannot move axially. The inner shaft 56 is fixed to rotate with the outside handle and telescopes, or extends, axially from the outer shaft 58 when the outside handle is pulled away from the aircraft door 14. A stop pin 66 is attached to the outer shaft 58 and passes through an axial slot in the inner shaft 56 so that both shafts will rotate in unison. The amount of rotation and the amount of axial extension of the exterior handle 52 before rotation can occur is controlled by the interaction of pin shafts 119 that are attached to the inner shaft 56 with each pin having integral bearings that are in contact with the curved slots in the cylindrical housing body 77 that is nestled between the outer shaft 58 and inner shaft 56. (See also FIGS. 5-7 and 8a-8c)

[0047] The outside handle 52, as depicted in FIGS. 2-7, is formed out of an integral piece of material and has a center hub 64 to which the inner shaft 56 is secured by a solid pin 104. In the event the outside handle 52 becomes extended while in flight, the inner shaft 56 axial slot and outer shaft stop pin 66 stabilizes the handle relative to the surrounding airflow so as to prevent its rotation. The outside handle 52 is normally seated in a handle pan feature 72 of the handle housing body 67 that is mounted to the outside of the aircraft door 14 flush with the outer skin 54. The handle housing body 67 is formed with an opening 74 through which a central intermediate supporting shaft 77 with two curved slots 105 is mounted to it by two solid stop pins 78. The inner shaft 56 is fully covered by the central supporting shaft 77. The outer shaft 58 fully covers the central supporting shaft and extends into the aircraft fuselage 18. The handle pan opening 74 is defined by an outwardly extending cylindrical lip 75. The handle pan 72 defines a pair of recesses 76, one shown, in which the handle blades 106 and 68 are seated so that the handle 52 is flush with the outer skin 54 of the aircraft door 14. A hand access pocket 80 is also formed in the handle pan 72 inside of and adjacent to one of the recesses 76 in which the handle blade 68 is normally seated. The hand access pocket 80 is dimensioned to allow an individual outside the aircraft to reach in and pull the handle blade 68 outwards so the handle 52 can be used to actuate the cam and track mechanism 26.

[0048] The outer shaft 58 is formed from an integral section of metal and has a main body 100 in the form of an open ended cylinder. The inside surface of the outer shaft rotates on the outer surface of the central supporting shaft 77. The outer shaft 58 is formed with three circumferential flange tangs 106 extending away from the main body 100. The central flange 106 attaches to a pull-rod 108 that acts directly on a shaft 109 that is attached to the roller cam and track mechanism 26 that opens and closes the door.

General Description of Operation and the Illustrative Parts List for the First Embodiment of the Invention

1. General Description

[0049] The Flush Door Latch Assembly is used to secure a hinged aircraft access door. The assembly comprises a spring-loaded outer handle assembly, an actuator, and housing. (See FIGS. 5-7 and 8a-8c) The actuator is provisioned to accept an internal handle typically provided by the end user. The internal handle is also referred to as the interior handle or inside handle in this application. The internal handle is fixed in the actuator, and the external handle assembly is in the retracted position in the housing pan. The housing pan includes a hinged door assembly, also referred to as an aerodynamic flapper to provide access to the retracted outer handle assembly.

[0050] Refer to Table 1 for the Technical Properties of the Flush Door Latch Assembly.

[0051] See FIG. 7 for a Cross Section View of the Flush Door Latch Assembly.

[0052] a. Operation

[0053] Rotation of either the inner or outer handle causes a corresponding rotation of the actuator. When the actuator is in the closed position, the spring-loaded handle is stowed flush with the housing. With the outside handle in the stowed position, the inside handle may be rotated to actuate the latch assembly.

TABLE-US-00001 TABLE 1 Technical Properties Property Specification Length 18 Inches (457 mm) Width 4.5 Inches (114.3 mm) Depth/Thickness 5.9 Inches (149.9 mm) Outer Handle Extension 1.5 to 1.7 Inches (38.1 to 43.2 mm) (from stowed to open) Outer Handle Rotation 46 Degrees (from stowed to open) Weight 5.0 lbs. (2.2 kg)

[0054] Procedures for assembly are listed below. [0055] A. Apply Loctite to mating surfaces of top hat plug and external handle. [0056] B. Install top hat plug through external handle and install the handle stop pad over the protruding end of the top hat plug. [0057] C. Apply wet zinc-chromate primer or corrosion preventative compound to the surface of the protruding end of the top hat plug and to the surface of the top hat pin. [0058] D. Align the mount holes in the top hat plug and the external handle shaft then press the top hat pin into the top hat plug and the external handle shaft while the primer is still wet. [0059] E. Insert the new spring into the external handle shaft. [0060] F. Apply wet zinc-chromate primer or corrosion preventative compound to the surface of the handle return spring pin. [0061] G. Press the pin into the external handle shaft to retain the spring while the primer is still wet. [0062] H. Apply wet zinc-chromate primer or corrosion preventative compound to the surfaces of the two housing body to housing shaft pins. [0063] I. Align the mount holes in the housing body and the housing shaft, then press the housing body to housing shaft pins into the housing body and the housing shaft while the primer is still wet. [0064] J. Install the hinge door assembly flap to the hinge assembly with four BACR15CE3 rivets. [0065] K. Install the hinge assembly to the housing body with four BACR15CE3 rivets. [0066] L. Install the external handle shaft into the housing shaft. [0067] M. Extend the handle return spring from the housing shaft and install the return spring keeper. [0068] N. Apply Loctite to the threads of the cam-followers and install them through the J-slots of the housing shaft into the external handle shaft with 40 to 45 in-lbs. (54.2 to 61.0 N-m) of torque to secure the cam-followers to the external handle shaft. [0069] O. Install the new quad ring into the actuator. [0070] P. Lubricate the mating surfaces of the actuator and the housing shaft with grease. [0071] Q. Place the actuator over the housing shaft. [0072] R. Align the hole in the actuator with the slot in the housing shaft and install the actuator stop pin. [0073] S. Apply wet zinc chromate primer or corrosion preventative compound to the threads of the actuator stop pin screws. Install the screws while the primer is wet. [0074] T. For countersunk head screws; use a torque wrench and install the two screws with 40 to 45 in-lbs. (54.2 to 61.0 N-m) of torque to secure the actuator fitting to the actuator. [0075] U. Install the collar over the actuator.

2. Illustrative Parts List (IPL) for FIG. 8A-8c

[0076] The Illustrative Parts List is divided into 6 columns. The information supplied in each column is given below.

[0077] A. FIG. Item Column [0078] (1) The first number at the top of each FIG. ITEM column is the figure number of the related exploded-view IPL illustration. The number given opposite each part number is the item number given to the part in the illustration. [0079] (2) A dash (-) is put in front of an item number when the part is not illustrated. [0080] (3) Alpha-variants A through Z (except for I and O) are given to item numbers when necessary to identify added parts, alternative parts and parts added, deleted, modified or superseded by a service bulletin or letter.

[0081] b. Part Number Column [0082] (1) This column contains the manufacturer's parts number for each part, as modified to meet the requirements of ATA Specification 200/2000. The modifications can include: [0083] (a) Removal of blank spaces and special characters. [0084] (b) Removal of dashes. Dashes are permitted only between numeric characters. [0085] (2) A reference part number compatible with ATA Specification 200/2000 is given if the manufacturer's part number exceeds 15 characters. The complete manufacturer's part number is given in the NOMENCLATURE column. [0086] (3) The basic part number is given in the PART NUMBER Column and may be followed by an alpha suffix (115A) for identification purposes. This is done to comply with the ATA Provisioning Data file edit requirements. [0087] (4) The complete part number is given in the NOMENCLATURE column (FULL P/N 115-094-1400). This is the part number to be used to order replacement parts.

[0088] c. Material Description Column

[0089] This column identifies the base material from which the component is manufactured.

[0090] D. Nomenclature Column [0091] (1) This column contains descriptive nomenclature for each component. It also gives details of the relationship of the assemblies, subassemblies and detail parts and any applicable history information. [0092] (2) The indenture system used in the NOMENCLATURE column shows how one part is related to one more as follows: [0093] 1 2 3 4 5 6 7 [0094] End Item or Major Assembly [0095] *ATTACHING PARTS* [0096] Attaching Parts for End Item or Major Assembly [0097] * * * * * * * * * * * * [0098] . Sub-Assembly of End Item or Major Assembly [0099] . . Detail parts of Sub-Assembly [0100] (3) Attaching Parts are listed immediately following the item which they attach. They are preceded by the phrase *ATTACHING PARTS* and are followed by the symbol * * * * * * * * * * *. [0101] (4) The basic part number is given in the PART NUMBER Column and may be followed by an alpha suffix (115A) for identification purposes. This is done to comply with the ATA Specification 200/2000 Provisioning Data file edit requirements. The complete part number is given in the NOMENCLATURE column (FULL P/N 115-094-1400). This is the part number to be used to order replacement parts. [0102] (5) Assemblies, subassemblies and detail parts applicable to modifications, deletions, additions or replacement by an issued service bulletin or service letter are given to show both pre- and post-service bulletin/letter (SB/SL) configuration. [0103] (a) The term (PRE-SB/SL) in the NOMENCLATURE column gives the first configuration. [0104] (b) The term (POST-SB/SL) identifies assemblies and parts after the modification has been completed. [0105] (6) The interchangeability relationship between parts is identified in the NOMENCLATURE column of the Detail Parts List.

TABLE-US-00002 ILLUSTRATIVE PARTS LIST (IPL) FOR FIGS. 8a-8c FIG. AIRLINE UNITS ITEM STOCK NOMENCLATURE EFF PER IPL 1A PART NUMBER NO. 1 2 3 4 5 6 CODE ASSY 1 718411-201-001 TOP HAT PLUG A 1 2 718411-202-000 EXTERNAL HANDLE A 1 3 718411-203-001 STOP PAD A 1 4 718411-204-000 TOP HAT PIN A 1 5 718411-205-000 EXTERNAL HANDLE SHAFT A 1 6 718411-206-001 CAM FOLLOWER A 2 7 718411-207-001 HANDLE RETURN SPRING PIN A 1 8 718411-208-000 HANDLE RETURN SPRING A 1 9 718411-209-000 RETURN SPRING KEEPER A 1 10 718411-301-001 HINGE DOOR ASSEMBLY A 1 11 718411-302-002 HINGE DOOR FLAP RIVET A 4 12 718411-303-001 HINGE ASSEMBLY A 1 13 718411-304-000 HINGE DOOR HOUSING RIVET A 4 14 718411-305-000 HOUSING BODY A 1 15 718411-306-000 HOUSING SHAFT PIN A 2 16 718411-307-000 HOUSING SHAFT A 1 17 718411-401-000 QUADRING A 1 18 718411-402-000 ACTUATOR A 1 19 718411-403-000 STOP PIN A 1 20 718411-404-000 CAP SCREWS A 2 21 718411-405-000 COLLAR A 1

DETAILED DESCRIPTION OF THE SECOND EMBODIMENT OF THE INVENTION

[0106] FIG. 9 is a perspective view of an aircraft door assembly 14 to which one preferred embodiment of a handle assembly 28 of this invention is attached. The door assembly 14 includes a door 14 fitted into an opening 16 formed inside an aircraft fuselage 18. A hinge 20 connects the door 14 to the inside of the fuselage 18 so that the door can move between open and closed positions. The sides of the door 14 are provided with a number of outwardly extending door stops 22, and the fuselage 18 is provided with a number of flanges 24 that project into the opening 16 adjacent the door stops. When the aircraft is in flight, high cabin pressure inside the fuselage 18, in comparison to lower atmospheric pressure, urges the door 14 outwards so that door stops 22 abut the fuselage flanges 24 and seal the door shut. The opening and closing of the door 14 is controlled by a roller cam and track mechanism 26. When the door 14 is closed, the roller cam and track mechanism 26 control the travel of the door so that the door stops 22 move into a position slightly below and in front of the fuselage flanges 24. After the door stops are adjacent to the fuselage flanges 24, the roller cam and track mechanism pull the door 14 outward toward the aircraft fuselage 18 so that the door stops on the fuselage stop. When the door 14 is opened, the roller cam and track mechanism 26 first lifts the door upward slightly and inward so that the door stops 22 clear the fuselage flanges 24 so that in turn, the door 16 can be moved upward to the full open position. The upward movement of the door 14 to its open position is assisted by a spring loaded counterbalance mechanism that pulls the door upward. The actuation of the roller cam and track mechanism 26 is controlled by the handle assembly 12 as will be described hereinafter. The handle assembly 12 is provisioned to accept the attachment of an inside handle 9 so that actuation of the roller cam and track mechanism 26 and the opening and closing of the aircraft door 14 can be controlled from inside the aircraft.

[0107] As depicted in FIG. 10 thru 13 the handle assembly of this invention includes an external handle 3 that is normally seated flush with the outer skin 30 of the aircraft door 14 when the door handle assembly is in the stowed position. The external handle 3 is also referred to as the outside handle 3 or the exterior handle 3. An inner shaft 4 is housed by the shaft housing 2. The shaft housing 2 is housed by the actuator housing 17. The exterior handle 3 is fixed to the inner shaft 4 using a solid pin 32. The actuator housing 17 is fixed to the interior handle 9 by a bolt and nut assembly 10. The interior handle is also referred to as the internal handle 9 or the inside handle 9. The actuator housing 17 is supported by two ball bearing assemblies 5 and 11. The inner race of the ball bearing assembly 5 is supported by the shaft housing 2. The outer race of the ball bearing assembly 5 provides support to the actuator housing 17. The inter race of the ball bearing assembly 11 is supported by the shaft housing 2. The outer race of the ball bearing assembly 11 provides support to the actuator housing 17. By supporting the actuator with the use of ball bearing assemblies 5 and 11, it allows for smooth and precise rotation about the axis of all cylindrical parts which include the inner shaft 4, the shaft housing 2, and the actuator housing 17. An additional ball bearing assembly 21 is utilized to support the actuator housing 17 which in turn provides a secondary means of support to the shaft housing 2. The primary support for the shaft housing is provided by the handle housing 1. The shaft housing 2 is fixed to the handle housing 1 by utilizing a retaining nut 7. The cam follower pin 8 passes through the shaft housing 2, the inner shaft 4 and the spring keeper 15. The cam follower 8 limits the amount of travel the inner shaft 4 in both the axial and the rotational direction because the cam follower 8 is only free to rotate and translate within a specified slot cut through the shaft housing 2. The cam follower 8 is also confined to an internal pathway cut into the inner surface of the actuator housing 17. The external handle return spring 25 is attached to the spring keeper 15 by engaging the spring coils over a specified thread cut into the spring keeper 15. The spring retainer 13 is supported by the shaft housing 2. The spring 25 is attached to the spring retainer 13 by engaging the spring coils over a specified thread cut into the spring retainer 13. The shaft housing 2 supports a seal 19 to ensure fuselage cabin pressure does not escape. The actuator housing 17 supports a second seal 6 to ensure fuselage cabin pressure does not escape.

[0108] As described in FIGS. 14a and 14b, the shaft housing 2 has specified geometry cuts through the cylinder walls that provide a means of limiting the travel of the cam follower pin 8. When the external handle 3 is in the stowed position (shown FIG. 15) the cam follower 8 is limited to only axial movement by the shaft housing 2. Even though the external handle 3 is in the stowed position the cam follower 8 is partially disengaged from the actuator housing 17 which allows the internal handle 9 to rotate a specified amount in one direction. The stowed position is the normal position that the handle assembly is in due to the constant spring pressure provided by the external handle return spring 25 regardless of the door 14 being in the open or closed position. As the external handle 3 is extended outward by an operator, the cam follower pin 8 travels axially engaging the axial pathway cut into the actuator housing 17. Once the cam follower pin 8 travels a specified distance, it partially disengages the shaft housing 2 and remains fully engaged to the actuator housing 17 allowing a mechanical connection between the external handle 3 and the actuator housing 17. Upon full extension of the external handle 3 the cam follower pin 8 allows the inner shaft 4 to rotate freely within a specified range. By allowing the inner shaft 4 to rotate freely within the limits of the shaft housing 2, this allows the operator to actuate the door linkage 29 as needed. The operator can let go of the external handle 3 in any range of extension and rotation and the external handle will automatically return itself back to the stowed position (including the clocking position of the external handle 3 without contacting the handle housing 1 or the aircraft door skin 30. Returning the external handle 3 to the stowed position is controlled by a combination of the external handle return spring 25 providing spring pressure and the cam follower pin 8 following the slot geometry of the shaft housing 2.

General Description of Operation and the Illustrative Parts List for the Second Embodiment of the Invention

[0109] 1. General Description of Operation

[0110] The Flush Door Latch Assembly is used as the mechanical means to open, close, and secure a hinged aircraft access door. The assembly consists of a spring-loaded exterior handle assembly, an actuator, a housing pan, and an internal handle. The internal handle is fixed to the actuator, and the exterior handle engages the actuator when it is extended by the operator. The external handle disengages the actuator and automatically re-stows itself when the operator releases the exterior handle. The external handle is also referred to as the outside handle or the exterior handle.

[0111] Refer to Table 2 for the Technical Properties of the Flush Door Latch Assembly for the second embodiment.

[0112] See FIGS. 15a-15b for the Primary Components of the Flush Door Latch Assembly for the second embodiment.

[0113] See FIG. 16 for a Cross Section View of the Flush Door Latch Assembly.

[0114] a. Operation

[0115] Rotation of either the inner or outer handle causes a corresponding rotation of the actuator. When the actuator is in the closed or retracted position, the spring loaded exterior handle is stowed flush with the housing pan. With the exterior handle in the stowed position, the interior handle may be rotated to actuate the latch assembly.

TABLE-US-00003 TABLE 2 Technical Properties For The Second Embodiment Property Specification Length 18.3 Inches (464.82 mm) Width 4.6 Inches (118.36 mm) Depth/Thickness 6.1 Inches (154.94 mm) Exterior Handle Extension 1.5 to 1.7 Inches (38.1 to 43.2 mm) (from stowed to open) Exterior Handle Rotation 46 Degrees min 48 Degrees max (from extended to full rotation) Weight 4.0 lbs. (1.8 kg)

[0116] 2. Illustrative Parts List (IPL) for FIG. 17A-17d

[0117] The Illustrative Parts List (IPL) is divided into 6 columns. The information supplied in each column is given below:

[0118] A. FIG. Item Column [0119] (1) The first number at the top of each FIG. ITEM column is the figure number of the related exploded-view IPL illustration. The number given opposite each part number is the item number given to the part in the illustration. [0120] (2) A dash (-) is put in front of an item number when the part is not illustrated. [0121] (3) Alpha-variants A through Z (except for I and O) are given to item numbers when necessary to identify added parts, alternative parts and parts added, deleted, modified or superseded by a service bulletin or letter.

[0122] B. Part Number Column [0123] (1) This column contains the manufacturer's parts number for each part, as modified to meet the requirements of ATA Specification 200/2000. The modifications can include: [0124] (a) Removal of blank spaces and special characters. [0125] (b) Removal of dashes. Dashes are permitted only between numeric characters. [0126] (2) A reference part number compatible with ATA Specification 200/2000 is given if the manufacturer's part number exceeds 15 characters. The complete manufacturer's part number is given in the NOMENCLATURE column. [0127] (3) The basic part number is given in the PART NUMBER Column and may be followed by an alpha suffix (115A) for identification purposes. This is done to comply with the ATA Provisioning Data file edit requirements. [0128] (4) The complete part number is given in the NOMENCLATURE column (FULL P/N 115-094-1400). This is the part number to be used to order replacement parts.

[0129] C. Material Description Column

[0130] This column identifies the base material from which the component is manufactured.

[0131] D. Nomenclature Column [0132] (1) This column contains descriptive nomenclature for each component. It also gives details of the relationship of the assemblies, subassemblies and detail parts and any applicable history information. [0133] (2) The indenture system used in the NOMENCLATURE column shows how one part is related to one more as follows: [0134] 1 2 3 4 5 6 7 [0135] End Item or Major Assembly [0136] *ATTACHING PARTS* [0137] Attaching Parts for End Item or Major Assembly [0138] * * * * * * * * * * * * [0139] . Sub-Assembly of End Item or Major Assembly [0140] . . Detail parts of Sub-Assembly [0141] (3) Attaching Parts are listed immediately following the item which they attach. They are preceded by the phrase * ATTACHING PARTS* and are followed by the symbol * * * * * * * * * [0142] (4) The basic part number is given in the PART NUMBER Column and may be followed by an alpha suffix (115A) for identification purposes. This is done to comply with the ATA Specification 200/2000 Provisioning Data file edit requirements. The complete part number is given in the NOMENCLATURE column (FULL P/N 115-094-1400). This is the part number to be used to order replacement parts. [0143] (5) Assemblies, subassemblies and detail parts applicable to modifications, deletions, additions or replacement by an issued service bulletin or service letter are given to show both pre- and post-service bulletin/letter (SB/SL) configuration. [0144] (a) The term (PRE-SB/SL) in the NOMENCLATURE column gives the first configuration. [0145] (b) The term (POST-SB/SL) identifies assemblies and parts after the modification has been completed. [0146] (6) The interchangeability relationship between parts is identified in the NOMENCLATURE column of the Detail Parts List.

TABLE-US-00004 ILLUSTRATIVE PARTS LIST (IPL) FOR FIGS. 17a-17d FIG. AIRLINE UNITS ITEM STOCK NOMENCLATURE EFF PER IPL 1A PART NUMBER No. 123456 CODE ASSY 1 718932-100-329 HOUSING, DOOR HANDLE A 1 2 718932-100-311 CAM RAIL, SHAFT A 1 HOUSING 3 718932-100-313 STOPPER, RING A 1 4 MS16625-1137 SNAP RING A 1 5 718932-100-315 NUT, RETAINING A 1 6 BACB10FU25JZ BEARING 1 7 SLS-A-125-N-70 QUAD RING SEAL 1 8 718932-100-303 HANDLE, INTERNAL A 1 9 SLS-A-125-N-70 QUAD RING SEAL 1 10 718932-100-301 HOUSING, ACTUATOR A 1 11 BACB30NMK26 BOLT 1 12 NAS1149D0332J WASHER 2 13 BACN10JD3CD NUT 1 14 BACB10FU12J BEARING 1 15 MS16625-1118 SNAP RING 1 16 718932-100-333 COVER, HINGE A 1 17 718932-100-319 PIN, EXTERNAL HANDLE A 1 18 718932-100-317 SHAFT, EXTERNAL HANDLE A 1 19 718932-100-323 RECEIVER, SPRING A 1 20 AE059-613-21.00- RETURN SPRING 1 17-7-1.298-NH-N-IN 21 718932-100-321 HANDLE, EXTERNAL A 1 22 718932-100-325 PIN, CAM FOLLOWER A 1 23 718932-100-305 PLATE, BEARING SUPPORT A 1 24 BACB10FU25JZ BEARING 1 25 MS16625-1200 SNAP RING 1 26 718932-100-327 KEEPER, SRING RETURN A 1 27 MS16624-1075 SNAP RING 1 28 103689-1 SPRING 1 29 718932-100-701 HINGE 1 30 718932-100-701 HINGE 1 31 718932-100-701 HINGE PIN 1 32 BACR15CE3D SOLID FLUSH RIVETS 4 33 BACR15CE3D SOLID RIVETS 4

[0147] 3. Procedures

[0148] NOTE: Numbers in parentheses refer to IPL Figure item numbers. [0149] A. Install aerodynamic flapper gate assembly (16) to the handle housing (1). Use solid rivets as the attaching hardware 33. [0150] B. Apply sealant to faying surfaces of the external handle shaft (18) and external handle (21). [0151] C. Install external handle shaft (18) through external handle (21) and apply wet zinc-chromate primer to the external handle pin (17) and install through both the shaft (18) and the handle (21). [0152] D. Thread the return spring (20) onto the spring receiver (19), and ensure that 3 coils of the spring are engaged onto the threads of the receiver. Set aside for later assembly. [0153] E. Apply sealant to the cam rail (2) and install through the handle housing (1), and ensure that the clocking key is aligned. Wipe away any excess sealant and install bearing (6) onto the cam rail (2). Apply sealant to retaining nut threads (5), and install over bearing (6) tighten to 32-60 foot pounds. Place the stop pad (3) on to the cam rail and install the snap ring (4) to lock it in place. [0154] F. Take the previously assembled receiver and spring (19 and 20) and place in the open end of the external handle shaft (18) receiver end into the handle first so that the spring is sticking out. Slide the external handle assembly (17,18,19,20 and 21) through the previously assembled housing and cam rail (1,2). Using a tapered aligning tool align the spring receiver (19) to the external handle shaft (18) so that the cam follower (22) can slide through the open slot in the cam rail (2). Set assembly aside for later assembly. [0155] G. Slide the bearing (14) into the actuator housing (10) until it is seated. Using long nose snap ring pliers, install the snap ring (15) into the actuator housing (10) to trap the bearing (14) between the snap ring (15) and the bearing seat. Install the seal (9) onto the outer diameter of the actuator (10) so that it is seated into the seal groove. [0156] H. Install the actuator (10) and the previously installed bearing (14) and snap ring (15) onto the previously assembled cam rail (2), and the handle housing (1). Orientate the actuator (10) so that the actuator linkage attach flanges are on the same side as the aircraft linkage. Slide the actuator (10) onto the cam rail (2) and align the cam follower (22) so it is aligned with the vertical keyway slot on the inside surface of the actuator (10). Slide the actuator (10) all the way until it seats and the snap ring groove on the cam rail (2) is exposed. Using snap ring pliers, install the snap ring (27) to lock the actuator (10) into place. Thread the return spring (20) over the spring retainer (26) and ensure 3 coils are engaged. [0157] I. Install bearing (24) into bearing support collar (23) and, using snap ring pliers, install snap ring (25) to secure bearing. Slide collar assembly over actuator (10). Slide internal handle (8) over actuator (10), align bolt hole and install bolts (11) with washer (12) under head. Install washer (12) under nut (13).

[0158] It should be understood that the foregoing relates to exemplary embodiments of the invention and that modifications may be made without departing from the spirit and scope of the invention. It should also be understood that the present invention is not limited to the designs mentioned in this application and the equivalent designs in this description, but it is also intended to cover other equivalents now known to those skilled in the art, or those equivalents which may become known to those skilled in the art in the future. For example, alternative embodiments of the invention may be desirable to provide an outer shaft at a variable axial position in the aircraft fuselage 18, and an inner shaft attached to the outside handle that telescopes outwards when the outside handle is extended. Specific subassemblies of components of this invention similarly may differ widely from what has been described. For instance, in some embodiments of the invention, it may be desirable to form the handle housing body and cylindrical intermediate supporting shaft as a single piece. Moreover, it should be clear that the invention can be practiced without all the disclosed features of the described embodiment. For example, in some versions of the invention it may not be necessary to provide the interior handle box 28.