Inner handle locking mechanism of aircraft cabin door

Abstract

An inner handle locking mechanism of an aircraft cabin door belongs to the technical field of cabin door mechanism design, and particularly relates to a control mechanism of an inner handle of the aircraft cabin door, a telescopic flight lock drives a rocker arm to rotate and drives a clip-shaped lock hook to rotate, the clip-shaped lock hook locks a shifting fork connected to the inner handle, and the shifting fork and the inner handle are both fixedly connected to an inner handle shaft. Therefore, the function of locking the inner handle by the concentric-square-shaped lock hook is achieved. A retainer is fixedly connected to a lock hook shaft, a screw for adjustment is designed on a cabin door structure, and a screw for adjustment is also designed at the front end of a shifting fork, so that the telescopic flight lock has good adjustment adaptability, a locking surface on the concentric-square-shaped lock hook tends to be locked under the action of the shifting fork, and locking of the telescopic flight lock on the inner handle is reliably guaranteed. Reliable locking of the handle in the cabin door is achieved, the adjusting problem of an existing handle mechanism in the cabin door is solved, the risk of reverse driving of the mechanism is avoided, and the handle locking mechanism is compact in space, simple in structure, accurate in adjustment and low in cost.

Description

Technical Field

[0001] The invention belongs to the field of cabin door mechanisms of civil aircraft, and relates to an inner handle locking mechanism of an aircraft cabin door, and in particular to a locking mechanism installed on an inner handle of a cabin door of a civil aircraft. Background Art

[0002] The inner handle of an aircraft cabin door is an important device for opening the cabin door, and the opening of the cabin door has a significant impact on flight safety. If the cabin door is accidentally opened during flight, it is very likely to have catastrophic consequences. Therefore, a special inner handle locking measure needs to be designed to ensure that the cabin door is reliably locked during flight. The traditional inner handle locking mechanism has two main problems. On the one hand, the manufacturing precision requirements are extremely high, and the mechanism adjustment is difficult, resulting in high production costs and is not conducive to the installation and maintenance of the mechanism; on the other hand, the locking mechanism is not reliable and is sensitive to the backdrive load. It is difficult to ensure a good locking trend during the assembly of the mechanism, which has a destructive effect on the flight lock.

[0003] The invention uses a telescopic flight lock as the power source of the mechanism and utilizes the crank slider principle to control the return lock. The locking surface in the locked state has a unique locking trend to ensure reliable locking of the mechanism. The overall mechanism also has multiple adjustment measures such as adjustable connecting rods and limit screws, which facilitate the installation, debugging, and maintenance of the mechanism. The operation is efficient and convenient, saving assembly costs, maintenance costs, etc. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an inner handle locking mechanism for an aircraft cabin door, which can effectively solve the problems in the background technology. The present invention drives the rocker arm to rotate through a telescopic flight lock, which drives the return-shaped lock hook to rotate. The return-shaped lock hook locks the shift fork connected to the inner handle. The shift fork and the inner handle are both fixed to the inner handle shaft, thereby realizing the locking function of the return-shaped lock hook on the inner handle. A stopper is fixed to the lock hook shaft, a screw for adjustment is designed on the cabin door structure, and a screw for adjustment is also designed at the front end of the shift fork, ensuring that the present invention has good adjustment adaptability. The locking surface on the return-shaped lock hook tends to lock under the action of the shift fork, which reliably ensures the locking of the telescopic flight lock on the inner handle.

[0005] The present invention adopts the following technical solution:

[0006] An inner handle locking mechanism for an aircraft cabin door, the inner handle locking mechanism for an aircraft cabin door comprises a telescopic flight lock 2, a first support 3, an adjustable connecting rod 5, a rocker arm 7, a lock hook shaft 8, a second support 9, a return lock 12, a stopper 13, a shift fork 14, an inner handle shaft 15, an inner handle 16, and a third support 19. Specifically:

[0007] The telescopic flight lock 2 is fixedly connected to the first support 3, the first support 3 is fixedly connected to the cabin door structure 1, one end of the adjustable connecting rod 5 is hinged to the telescopic flight lock 2 through the shaft 4, the other end of the adjustable connecting rod 5 is hinged to the rocker arm 7 through the bolt 6, the rocker arm 7 is fixed to the lock hook shaft 8, the two first screws 10 are respectively clamped on the second support 9 through the double nuts 11, the second support 9 is fixed to the cabin door structure 1, the return lock 12 and the stopper 13 are respectively fixed to the lock hook shaft 8, the lock hook shaft 8 is hinged to the cabin door structure 1, the fork 14 and the inner handle 16 are respectively fixed to the inner handle shaft 15, the inner handle shaft 15 is hinged to the cabin door structure 1, the screw 20 is threaded on the fork 14, the second nut 21 locks the screw 20 on the fork 14, the second screw 17 is clamped on the third support 19 through the two first nuts 18, and the third support 19 is fixed to the cabin door structure 1.

[0008] The telescopic flight lock 2 drives the rocker arm 7 to rotate through the adjustable connecting rod 5, and the rocker arm 7 drives the lock hook shaft 8 to rotate.

[0009] When the telescopic flight lock 2 is locked, the stop surface 13a of the stop piece 13 fixed on the lock hook shaft 8 contacts the first screw 10, which plays a limiting role after locking. When the telescopic flight lock 2 is unlocked, the stop surface 13b of the stop piece 13 fixed on the lock hook shaft 8 contacts another first screw 10, which plays a limiting role after unlocking.

[0010] The screw 20 is threadedly connected to the shift fork 14 . By rotating the screw 20 , the position of the screw 20 relative to the shift fork 14 can be adjusted, thereby adjusting the clearance between the screw 20 and the locking surface 12 a .

[0011] When the telescopic flight lock 2 is locked, there is only a 2mm gap between the locking surface 12a of the return lock 12 and the screw 20 on the fork 14. If the fork 14 rotates at this time, the screw 20 threaded on the fork 14 will soon contact the locking surface 12a. The screw 20 has a tendency to cause the return lock 12 to continue to rotate in the locking direction, thereby achieving reliable locking of the rotational movement of the fork 14 by the return lock 12. When the telescopic flight lock 2 is unlocked, the locking surface 12a of the return lock 12 moves away from the fork 14, thereby achieving unlocking of the fork 14 by the return lock 12.

[0012] The inner handle 16 and the fork 14 are respectively fixed to the inner handle shaft 15, and the inner handle shaft 15 is hinged to the door structure 1. When the fork 14 is locked by the return lock 12, the inner handle 16 cannot rotate either, thereby realizing the locking of the inner handle 16 by the arc lock 12. When the return lock 12 releases the restriction on the fork 14, the inner handle 16 can be rotated under the action of external force, thereby realizing the unlocking of the inner handle 16 by the return lock 12.

[0013] The second screw 17 is clamped on the third support 19 by two first nuts 18. When the telescopic flight lock 2 is locked, the inner handle 16 contacts the second screw 17 to achieve the stop limit of the inner handle 16 rotating downward. When the telescopic flight lock 2 is unlocked, external force can operate the inner handle 16 to rotate upward and open. According to the needs of posture adjustment, the position of the second screw 17 clamped on the third support 19 can be adjusted by the two first nuts 18 to achieve the limit adjustment of the inner handle 16 by the second screw 17.

[0014] The present invention has the following advantages and beneficial effects:

[0015] (1) Reliable locking. The invention uses a telescopic flight lock as the power source of the mechanism and uses the crank slider principle to control the return lock. The front locking surface of the return mechanism has a self-locking tendency. If the inner handle is accidentally operated in the locked state, the lock hook tends to lock when it receives the action of the shift fork, ensuring reliable locking of the mechanism.

[0016] (2) Accurate adjustment. The present invention is designed with multiple adjustment measures such as adjustable connecting rods and limit screws, which can not only adjust the initial state of the locking mechanism, but also can be conveniently adjusted to adapt to the posture of the inner handle, greatly reducing the difficulty of adjustment and improving work efficiency.

[0017] (3) Compact structure. The present invention adopts the crank slider principle in combination with thread adjustment measures, has a simple structure, precise adjustment, occupies a small space, and improves the overall design layout of the hatch.

[0018] (4) Wide application scope. The present invention has good applicability and can be widely applied to the locking design of the rotating mechanism of various hatches, and can also be used for stepless precision adjustment of other mechanical products.

[0019] In summary, the present invention realizes reliable locking of the handle inside the cabin door, solves the adjustment problem of the existing handle mechanism inside the cabin door, avoids the risk of mechanism back-drive, and provides a handle locking mechanism with compact space, simple structure, precise adjustment and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is an axonometric diagram of an inner handle locking mechanism of an aircraft cabin door.

[0021] Figure 2 The invention discloses a driving device for an inner handle locking mechanism of an aircraft cabin door.

[0022] Figure 3 The present invention is a schematic diagram of a locking device of an inner handle locking mechanism of an aircraft cabin door.

[0023] Figure 4 The present invention is a schematic diagram of a return lock hook of an inner handle locking mechanism of an aircraft cabin door.

[0024] Figure 5 The present invention is a schematic diagram of a stopper of an inner handle locking mechanism of an aircraft cabin door.

[0025] Figure 6 The present invention is a schematic diagram of a return lock hook connection of an inner handle locking mechanism of an aircraft cabin door.

[0026] Figure 7 The present invention is a schematic diagram of a fork connection of an inner handle locking mechanism of an aircraft cabin door.

[0027] Figure 8 The present invention is a schematic diagram of a handle limit of an inner handle locking mechanism of an aircraft cabin door.

[0028] Fig. 9 The present invention is a schematic diagram of the locking state of an inner handle locking mechanism of an aircraft cabin door.

[0029] Fig.10 A schematic diagram of the unlocked state of an inner handle locking mechanism of an aircraft cabin door.

[0030] In the figure: 1 door structure; 2 telescopic flight lock; 3 first support; 4 shaft; 5 adjustable connecting rod; 6 bolt; 7 rocker arm; 8 lock hook shaft; 9 second support; 10 first screw; 11 double nut; 12 return lock; 13 stopper; 14 fork; 15 inner handle shaft; 16 inner handle; 17 second screw; 18 first nut; 19 third support; 20 adjustable screw; 21 second nut.

[0031] 12a locking surface; 13a stopping surface; 13b stopping surface. DETAILED DESCRIPTION

[0032] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further clearly and completely described in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the structural principles of the present application, rather than to limit the present application. The attached drawings are not drawn to scale, but are only appropriately simplified drawings to illustrate the various features of the basic principles of the present invention. The specific design features disclosed in the present application, such as specific dimensions, directions, positions and shapes, will be partially determined by the specific application and use environment.

[0033] It should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, and other related parts may refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments may be combined with each other to obtain new embodiments.

[0034] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "hinge", "fixed connection", "threaded connection", "locked", "unlocked" and other similar words used in the description of this application should be understood in a broad sense. For example, the hinge can be a bolt as the rotation axis, a stepped shaft as the rotation axis, or a hole-axis connection between two elements. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0035] The mechanism of the present invention will be described in detail below with reference to the accompanying drawings:

[0036] See also Figure 1 , is an axonometric diagram of an inner handle locking mechanism of an aircraft cabin door, a telescopic flight lock 2 is fixedly connected to a first support 3, the first support 3 is fixedly connected to a cabin door structure 1, one end of an adjustable connecting rod 5 is hinged to the telescopic flight lock 2 through an axis 4, the other end of the adjustable connecting rod 5 is hinged to a rocker arm 7 through a bolt 6, the rocker arm 7 is fixedly connected to a lock hook shaft 8, two first screws 10 are respectively clamped on a second support 9 through double nuts 11, and the second support 9 is fixedly connected to the cabin door structure 1 The return lock 12 and the stopper 13 are respectively fixed to the lock hook shaft 8, the lock hook shaft 8 is hinged to the door structure 1, the fork 14 and the inner handle 16 are respectively fixed to the inner handle shaft 15, the inner handle shaft 15 is hinged to the door structure 1, the screw 20 is screwed to the fork 14, the second nut 21 locks the screw 20 to the fork 14, the second screw 17 is clamped on the third support 19 through two first nuts 18, and the third support 19 is fixed to the door structure 1.

[0037] See also Figure 2 , is an intention of a driving device for the inner handle locking mechanism of an aircraft cabin door. The telescopic flight lock 2 is fixedly connected to the first support 3, and the two ends of the adjustable connecting rod 5 are respectively hinged to the telescopic flight lock 5 and the rocker arm 7, the rocker arm 7 is fixedly connected to the lock hook shaft 8, and the lock hook shaft 8 is hinged to the cabin door structure 1. When the telescopic flight lock 2 is extended, the adjustable connecting rod 5 drives the rocker arm 7 to rotate counterclockwise, and the rocker arm 7 drives the lock hook shaft 8 to rotate counterclockwise. When the telescopic flight lock 2 is shortened, the adjustable connecting rod 5 drives the rocker arm 7 to rotate clockwise, and the rocker arm 7 drives the lock hook shaft 8 to rotate clockwise.

[0038] See also Figure 3, which is a schematic diagram of a locking device of an inner handle locking mechanism of an aircraft cabin door. When the lock hook shaft 8 rotates counterclockwise, the return lock 12 and the stopper 13 fixed to the lock hook shaft 8 also rotate counterclockwise therewith, until the stop surface 13a on the stopper 13 contacts the stop pin 10 fixed to the second support 9. At this time, the lock hook shaft 8 stops rotating counterclockwise, and the return lock 12 covers the shift fork 14 to ensure that the shift fork 14 cannot rotate, thereby achieving the locking of the inner handle 16; when the lock hook shaft 8 rotates clockwise, the return lock 12 and the stopper 13 fixed to the lock hook shaft 8 also rotate clockwise therewith, until the stop surface 13b on the stopper 13 contacts the stop pin 10 fixed to the second support 9. At this time, the lock hook shaft 8 stops rotating clockwise, and the return lock 12 disengages from the shift fork 14, thereby achieving the unlocking of the inner handle 16.

[0039] See also Figure 4 , is a schematic diagram of a return lock hook of an inner handle locking mechanism of an aircraft cabin door. A locking surface 12a is designed in the cavity of the return lock 12. When the locking surface 12a is rotated into place, the fork 14 fixed to the inner handle shaft 15 can be locked.

[0040] See also Figure 5 , is a schematic diagram of a stopper of an inner handle locking mechanism of an aircraft cabin door, a stopper 13 is respectively designed with a stopper surface 13a and a stopper surface 13b, in a locked state, the stopper surface 13a contacts the first screw 10 to achieve a locked position limit; in an unlocked state, the stopper surface 13b contacts the first screw 10 to achieve an unlocked position limit.

[0041] See also Figure 6 , is a schematic diagram of the connection of a return lock hook of an inner handle locking mechanism of an aircraft cabin door. The return lock 12 and the stopper 13 are respectively fixed to the lock hook shaft 8. In the locked state, the stop surface 13a of the stopper 13 contacts the first screw 10. In the unlocked state, the stop surface 13b of the stopper 13 contacts the first screw 10. By adjusting the two nuts 11, the position of the screw 11 clamped on the second support 9 can be changed, thereby realizing the posture adjustment of the return lock 12.

[0042] See also Figure 7 , which is a schematic diagram of the fork connection of the inner handle locking mechanism of an aircraft cabin door. The screw 20 is threadedly connected to the fork 14. The position of the head of the screw 20 relative to the fork 14 can be adjusted by rotating the screw 20 to adapt to the contact gap of the overall mechanism to ensure that the fork 14 is reliably locked by the return lock 12. After the screw 20 is adjusted, the second nut 21 is tightened, and the second nut 21 locks the screw 21 on the fork 14.

[0043] See also Figure 8, which is a handle limit diagram of an inner handle locking mechanism of an aircraft cabin door. Two first nuts 18 tighten the second screw 17 on the third support 19. The first nuts 18 are adjusted as needed to ensure that the second screw 17 is in contact with the inner handle 16, so that the second screw 17 limits the inner handle 16 in the closed position.

[0044] See also Fig. 9 , is a schematic diagram of the locked state of the inner handle locking mechanism of an aircraft cabin door, wherein the screw 21 screwed on the fork 14 has a certain gap from the locking surface 12a of the return lock 12, and the gap is used to avoid movement interference when the return lock 12 is unlocked; in the locked state, if the fork 14 is rotated counterclockwise under the drive of the inner handle 16, the locking surface 12a of the return lock 12 will contact the screw 21, at this time, the fork 14 cannot continue to rotate, and plays a locking role, and the return lock 12 generates a counterclockwise rotation trend under the action of the screw 21, which will drive the lock hook shaft 8 to rotate counterclockwise, and the rotation trend of the lock hook shaft 8 causes the stop surface 13a of the stopper 13 fixed to the lock hook shaft 8 to be limited by the first screw 10, thereby realizing the locking effect of the return lock 12 on the fork 14.

[0045] See also Fig.10 , which is a schematic diagram of the unlocked state of the inner handle locking mechanism of an aircraft cabin door. The return lock 12 rotates clockwise under the drive of the telescopic flight lock 2, releasing the lock of the return lock 12 on the fork 14. At this time, the fork 14 fixed to the inner handle 15 can rotate clockwise, thereby completing the unlocking of the telescopic flight lock 2 to the inner handle 16.

[0046] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An inner handle locking mechanism for an aircraft cabin door, characterized in that: The inner handle locking mechanism of the aircraft cabin door comprises a telescopic flight lock (2), a first support (3), an adjustable connecting rod (5), a rocker arm (7), a lock hook shaft (8), a second support (9), a first screw (10), a return lock (12), a stopper (13), a fork (14), an inner handle shaft (15), an inner handle (16), a first nut (18), a third support (19), and a second nut (21); specifically: The telescopic flight lock (2) is fixedly connected to the first support (3), and the first support (3) is fixedly connected to the cabin door structure (1); The two ends of the adjustable connecting rod (5) are respectively hinged to the telescopic flight lock (2) and the rocker arm (7), and the rocker arm (7) is fixed to the lock hook shaft (8); The first screws (10) are provided with two and are respectively clamped on the second support (9) through double nuts (11); the second support (9) is fixed to the door structure (1); The return lock (12) and the stopper (13) are respectively fixed to the lock hook shaft (8), and the lock hook shaft (8) is hinged to the cabin door structure (1); The shift fork (14) and the inner handle (16) are respectively fixed to the inner handle shaft (15), the inner handle shaft (15) is hinged to the door structure (1), and the adjustable screw (20) is screwed to the shift fork (14). By rotating the screw (20), the position of the screw (20) relative to the shift fork (14) can be adjusted; The second nut (21) locks the adjustable screw (20) on the shift fork (14), and the second screw (17) is clamped on the third support (19), and the third support (19) is fixed to the cabin door structure (1).

2. The inner handle locking mechanism of an aircraft cabin door according to claim 1, characterized in that: The telescopic flight lock (2) drives the rocker arm (7) to rotate via the adjustable connecting rod (5), and the rocker arm (7) drives the lock hook shaft (8) to rotate.

3. The inner handle locking mechanism of an aircraft cabin door according to claim 1, characterized in that: The second screw (17) is clamped on the third support (19) by two first nuts (18); when the telescopic flight lock (2) is locked, the inner handle (16) contacts the second screw (17), realizing the stop limit of the inner handle (16) rotating downward; when the telescopic flight lock (2) is unlocked, external force can operate the inner handle (16) to rotate upward and open, and according to the need of posture adjustment, the position of the second screw (17) clamped on the third support (19) is adjusted by the two first nuts (18), realizing the limit adjustment of the second screw (17) on the inner handle (16).

4. The inner handle locking mechanism of an aircraft cabin door according to claim 1, characterized in that: One end of the adjustable connecting rod (5) is hinged to the telescopic flight lock (2) through the shaft (4), and the other end of the adjustable connecting rod (5) is hinged to the rocker arm (7) through the bolt (6). Since the rocker arm (7) is fixedly connected to the lock hook shaft (8), and the lock hook shaft (8) is hinged to the cabin door structure (1), when the telescopic flight lock (2) is extended, the adjustable connecting rod (5) drives the rocker arm (7) to rotate counterclockwise, and the rocker arm (7) drives the lock hook shaft (8) to rotate counterclockwise. When the telescopic flight lock (2) is shortened, the adjustable connecting rod (5) drives the rocker arm (7) to rotate clockwise, and the rocker arm (7) drives the lock hook shaft (8) to rotate clockwise.

5. The inner handle locking mechanism of an aircraft cabin door according to claim 1, characterized in that: A locking surface (12a) is designed in the cavity of the return lock (12), and when the locking surface (12a) rotates to a certain position, the shift fork (14) fixed to the inner handle shaft (15) can be locked; A stop surface (13a) and a stop surface (13b) are respectively designed on the stop member (13).

6. The inner handle locking mechanism of an aircraft cabin door according to claim 5, characterized in that: When the shift fork (14) is locked by the return lock (12), the inner handle (16) cannot rotate, and the return lock (12) locks the inner handle (16); when the return lock (12) releases the restriction on the shift fork (14), the inner handle (16) rotates under the action of an external force, and the return lock (12) unlocks the inner handle (16).

7. The inner handle locking mechanism of an aircraft cabin door according to claim 6, characterized in that: The locking and unlocking of the inner handle (16) by the return lock (12) are specifically as follows: When the telescopic flight lock (2) is locked: when the lock hook shaft (8) rotates counterclockwise, the return lock (12) and the stopper (13) fixed to the lock hook shaft (8) also rotate counterclockwise, until the stop surface (13a) on the stopper (13) fixed to the lock hook shaft (8) contacts the first screw (10) fixed to the second support (9), playing a limiting role after locking; at this time, the lock hook shaft (8) stops rotating counterclockwise, and the return lock (12) locks the shift fork (14), so that the return lock (12) locks the inner handle (16); When the telescopic flight lock (2) is unlocked: when the lock hook shaft (8) rotates clockwise, the return lock (12) and the stopper (13) fixed to the lock hook shaft (8) also rotate clockwise, until the stop surface (13b) on the stopper (13) fixed to the lock hook shaft (8) contacts the first screw (10) fixed to the second support (9), playing a limiting role after unlocking; at this time, the lock hook shaft (8) stops rotating clockwise, the return lock (12) disengages from the shift fork (14), and the return lock (12) is unlocked to the inner handle (16).

8. The inner handle locking mechanism of an aircraft cabin door according to claim 1, characterized in that: The posture adjustment of the return lock (12) can be achieved by changing the position of the double nut (11) clamped on the second support (9).

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