Helicopter door locking mechanism

Abstract

The application provides a cabin door locking mechanism for a helicopter, which comprises an outer handle assembly, an inner handle assembly, a lock box assembly and a lock seat assembly, wherein the outer handle assembly comprises an outer lock disc, an outer handle, a button, a first swing arm, a first spring shaft with a first spring, a tension spring and a second swing arm; when the outer handle is unlocked, the outer handle is automatically turned out by an angle under the transmission of the tension spring pulling the first swing arm, so as to facilitate an operator to hold; when the outer handle is continuously turned out, the second swing arm is driven to rotate to pull a steel wire rope, so that the lock box assembly can be unlocked with the lock seat assembly; the inner handle assembly comprises an inner lock disc, an inner handle and a second spring shaft; the second spring shaft can drive the second swing arm to rotate under the driving of the inner handle, and can also pull the steel wire rope to make the lock box assembly be unlocked with the lock seat assembly. The cabin door locking mechanism for the helicopter has good overall operation and control effect, and can be applied to the cabin door of a stealth helicopter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of door lock, in particular to a cabin door locking mechanism for helicopter. BACKGROUND

[0002] The cabin door locking mechanism is an important operating mechanism for passengers to get on and off the helicopter. The stealth helicopter is a kind of helicopter which is not easy to be detected by visual, radar, sound and infrared, etc. In terms of appearance, the plane or curved body is generally folded to reflect the incident radar wave to other directions. For the cabin door of the stealth helicopter, a special cabin door locking mechanism needs to be designed to meet the appearance design requirements and operation requirements of the cabin door of the stealth helicopter. SUMMARY

[0003] The present application is to solve the above problems, and aims to provide a cabin door locking mechanism for helicopter.

[0004] The present application provides a cabin door locking mechanism for helicopter, comprising an outer handle assembly, an inner handle assembly and a lock box assembly arranged on the cabin door, and a lock seat assembly arranged on the cabin door frame, and having the following characteristics: the outer handle assembly comprises an outer lock disc, an outer handle and a button arranged on the outer side of the outer lock disc, and a first swing arm, a first spring shaft with a first spring, a tension spring and a second swing arm arranged on the inner side of the outer lock disc, the outer handle is rotatably arranged on the outer lock disc and has a side edge provided with a slot matched with the button, the button is rotatably arranged on the outer lock disc, the button has a protrusion which can be inserted into the slot to realize locking or pulled out of the slot to realize unlocking, one end of the first swing arm is connected with one end of the outer handle, and the other end is provided with an arc-shaped sliding groove with the connection point as the center, one end of the first spring shaft is arranged on the boss formed on the inner side of the outer lock disc, the middle part is provided with a sliding shaft matched with the arc-shaped sliding groove, and the other end is provided with a long slot hole extending along the axial direction and matched with the second swing arm, the first spring is arranged on the first spring shaft and matched with the boss on the inner side of the outer lock disc to provide the force for rotating the outer handle inward, the tension spring is connected with the inner side of the outer lock disc and the first swing arm to provide the force for rotating the outer handle outward, the second swing arm passes through the long slot hole and is hinged to the inner side of the outer lock disc in the middle part, and the end of the second swing arm is connected with the lock box assembly through a steel wire rope; the inner handle assembly comprises an inner lock disc, an inner handle arranged on the outer side of the inner lock disc, and a second spring shaft arranged on the inner side of the inner lock disc and hinged with the inner handle, the second spring shaft can drive the second swing arm to rotate and slide along the long slot hole of the first spring shaft under the driving of the inner handle; when the outer handle is unlocked, the outer handle is automatically rotated outward by an angle equivalent to the central angle of the arc-shaped sliding groove under the transmission of the first swing arm driven by the tension spring, when the second swing arm is driven to rotate by the first spring shaft or the second spring shaft and pulls the steel wire rope, the lock box assembly can be unlocked with the lock seat assembly under the driving of the steel wire rope.

[0005] In the cabin door locking mechanism for the helicopter provided by the application, the outer handle assembly further comprises a lock cylinder and a blocking piece, the lock cylinder is arranged on the outer handle and connected with the inner end of the blocking piece, the blocking piece is driven to rotate by the lock cylinder and is axially blocked with the inner side of the outer lock disc to lock or unlock the outer handle and the outer lock disc.

[0006] In the cabin door locking mechanism for the helicopter provided by the application, the inner handle assembly further comprises an insurance handle and an insurance blocking piece, the inner handle is provided with a clamping groove for clamping the insurance blocking piece, the insurance handle is arranged on the outer side of the inner lock disc and connected with the inner end of the insurance blocking piece, the insurance blocking piece is driven to rotate by the insurance handle and is clamped or unclamped in the clamping groove to lock or unlock the inner handle.

[0007] Further, the outer side of the inner lock disc is provided with an insurance handle groove, the groove wall of the insurance handle groove is provided with a spring steel ball, and the insurance handle is circumferentially provided with a plurality of positioning grooves matched with the spring steel ball.

[0008] In the cabin door locking mechanism for the helicopter provided by the application, the second spring shaft is arranged on the boss formed on the inner side of the inner lock disc, one end of the second spring shaft is hinged with the inner handle, the other end is used to drive the second swing arm to rotate, and the second spring shaft is provided with a second spring, which provides a force for rotating the inner handle inward by cooperating with the boss on the inner side of the inner lock disc.

[0009] In the cabin door locking mechanism for the helicopter provided by the application, the outer side of the outer lock disc is provided with an outer handle groove and a button groove communicated with one side groove wall of the outer handle groove, the outer handle is rotatably connected in the outer handle groove, the button is rotatably connected in the button groove, and the hinge between the second swing arm and the outer lock disc is provided with a first torsion spring; the outer side of the inner lock disc is provided with an inner handle groove, and the inner handle is rotatably connected in the inner handle groove.

[0010] In the cabin door locking mechanism for helicopters provided by the present application, the locking box assembly comprises a locking box, a locking hook, a second torsion spring, a stopper block, and a third spring, one side of the locking box corresponding to the inner side of the cabin door is provided with a locking catch opening for the locking shaft of the lock seat assembly to enter and exit and cooperate with the locking hook, the inside of the locking box is provided with a slide opening at one end and an anti-collision column for limiting the clockwise and counterclockwise rotation position of the locking hook, the locking hook is hinged in the locking box and is provided with the second torsion spring at the hinge, the stopper block is slidably arranged in the slide, the head of the stopper block can extend out of the opening of the slide to block the locking hook, the bottom of the stopper block is connected with the steel wire, and the third spring is arranged in the slide and provides a force for the stopper block to extend out of the opening of the slide; the lock seat assembly comprises a lock seat and a locking shaft arranged on the lock seat; when the locking shaft is located in the locking catch opening of the locking box and is hooked by the locking hook, the head of the stopper block extends out of the opening of the slide and blocks the locking hook, and the locking box assembly and the lock seat assembly are in a locked state; when the stopper block is pulled by the steel wire and retracts into the slide, the locking hook rotates under the action of the second torsion spring and is disengaged from the locking shaft, and the locking box assembly and the lock seat assembly are in an unlocked state.

[0011] Further, the end of the steel wire close to the stopper block is provided with an anti-abrasion stopper, and the third spring is sleeved on the steel wire and arranged between the anti-abrasion stopper and the stopper block.

[0012] Further, the lock seat assembly further comprises a touch rod, a fourth spring, and a micro switch, the lock seat has a cavity, the touch rod extends through the cavity in the direction of opening and closing of the cabin door, the part of the touch rod in the cavity is provided with a triggering part for triggering the micro switch, the fourth spring is sleeved on the touch rod and arranged between the triggering part and the side wall of the cavity, the fourth spring provides a force for resetting the touch rod, and the micro switch is arranged in the cavity and its driving rod is arranged on the movement path of the triggering part of the touch rod; the outer surface of the locking box is provided with a stop block for driving the touch rod to move.

[0013] In the cabin door locking mechanism for helicopters provided by the present application, the number of the locking box assemblies is two and each is arranged on one side of the cabin door, the two locking box assemblies are connected with the two ends of the second swing arm through the steel wire, and the number of the lock seat assemblies is two and each is arranged on one side of the door frame of the cabin door.

[0014] Effects of the application

[0015] According to the cabin door locking mechanism for helicopters, the outer handle assembly includes an outer lock disc, an outer handle, a button, a first swing arm, a first spring shaft with a first spring, a tension spring and a second swing arm, when the outer handle is unlocked, the outer handle is automatically turned out by an angle under the transmission of the tension spring pulling the first swing arm, which is convenient for the operator to hold, when the outer handle is continuously turned out, the second swing arm is driven to rotate through the linkage of the first swing arm and the first spring shaft, and the second swing arm pulls the steel wire rope to unlock the lock box assembly and the lock seat assembly; the inner handle assembly includes an inner lock disc, an inner handle and a second spring shaft, the second spring shaft can drive the second swing arm to rotate and pull the steel wire rope to unlock the lock box assembly and the lock seat assembly under the driving of the inner handle. Therefore, the cabin door locking mechanism for helicopters can keep the outer handle in the outer handle slot of the outer lock disc in normal state, and can automatically turn out by an angle to unlock the lock box assembly and the lock seat assembly when the cabin door needs to be opened, and the inner handle can also be used to unlock the lock box assembly and the lock seat assembly, so that the overall operation and control effect is good, and the cabin door locking mechanism for helicopters can be applied to the cabin door of a stealth helicopter. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the cabin door locking mechanism for helicopters in the embodiment of the present application;

[0017] Figure 2 is a structural schematic view of the cabin door locking mechanism for helicopters in the embodiment of the present application;

[0018] Figure 3 is a structural schematic view of the cabin door locking mechanism for helicopters in the embodiment of the present application;

[0019] Figure 4 is a structural schematic view of the outer handle assembly in the embodiment of the present application, wherein (a) is an external schematic view of the outer handle assembly, and (b) is an internal schematic view of the outer handle assembly;

[0020] Figure 5 is a structural schematic view of the inner handle assembly in the embodiment of the present application, wherein (a) is an external schematic view of the inner handle assembly, (b) is an internal schematic view of the outer handle assembly, and (c) is a schematic view of the inner handle assembly after hiding the inner lock disc;

[0021] Figure 6 is a cooperation schematic view of the outer handle assembly and the inner handle assembly in the embodiment of the present application, wherein the inner handle assembly hides the inner lock disc;

[0022] Figure 7is a structural schematic diagram of a lock box assembly in an embodiment of the present application, wherein (a) is an external schematic diagram of the lock box assembly, (b) is an internal schematic diagram of the lock box assembly after the lock box cover plate is hidden, and (c) is an internal schematic diagram of the lock box assembly after the lock box body is hidden;

[0023] Figure 8 is a structural schematic diagram of a lock seat assembly in an embodiment of the present application, wherein (a) is an external schematic diagram of the lock seat assembly, and (b) is an internal schematic diagram of the lock seat assembly;

[0024] Figure 9 is a schematic diagram of the lock box assembly and the lock seat assembly when locked in an embodiment of the present application, wherein (a) is a schematic diagram of the lock hook of the lock box assembly hooking the lock shaft of the lock seat assembly, and (b) is a schematic diagram of the stop block of the lock box assembly abutting the trigger rod of the lock seat assembly.

[0025] Legend of reference signs:

[0026] 1 cabin door; 2 cabin door frame; 10 outer handle assembly; 11 outer lock disc; 12 outer handle; 13 square shaft; 14 lock core; 15 stop piece; 16 button; 17 first swing arm; 1701 arc-shaped sliding groove; 18 first spring shaft; 1801 long slot hole; 19 first spring; 110 sliding shaft; 111 tension spring; 112 second swing arm; 113 first torsion spring; 20 inner handle assembly; 21 inner lock disc; 22 inner handle; 23 safety handle; 24 safety stop block; 25 spring steel ball; 26 second spring shaft; 27 second spring; 28 flat head shaft; 30 lock box assembly; 31 lock box; 3101 lock box body; 31011 anti-collision column; 3102 lock box cover plate; 31021 stop block; 3103 lock catch opening; 32 lock hook; 33 second torsion spring; 34 stop block; 35 anti-wear stop sleeve; 36 third spring; 37 limiting peg; 40 lock seat assembly; 41 lock seat; 42 lock shaft; 43 pressing block; 44 trigger rod; 4401 trigger part; 45 fourth spring; 46 micro switch. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the following embodiments are combined with the drawings to specifically describe the present application.

[0028] EMBODIMENT

[0029] Figure 1 is a structural schematic diagram of a cabin door locking mechanism for a helicopter, Figure 2 and Figure 3 are respectively an internal side structure schematic diagram and an external side structure schematic diagram of a cabin door locking mechanism for a helicopter applied to a cabin door.

[0030] As Figures 1 to 3As shown, the embodiment provides a cabin door locking mechanism for helicopters, which is used for locking and unlocking between the cabin door 1 and the cabin door frame 2 of a helicopter, and comprises an outer handle assembly 10 arranged on the outer side of the cabin door 1, an inner handle assembly 20 arranged on the inner side of the cabin door 1, two lock box assemblies 30 respectively arranged along the two sides of the cabin door 1, and two lock seat assemblies 40 respectively arranged along the two sides of the cabin door frame 2. The outer handle assembly 10 and the inner handle assembly 20 can drive the two lock box assemblies 30 to act, and the two lock box assemblies 30 and the two lock seat assemblies 40 form two locking points. The components are described in detail below.

[0031] Figure 4 is a structural schematic diagram of the outer handle assembly 10, wherein (a) is an external schematic diagram of the outer handle assembly 10, and (b) is an internal schematic diagram of the outer handle assembly 10.

[0032] As shown in Figure 4 , the outer handle assembly 10 mainly comprises an outer lock disc 11, an outer handle 12, a lock core 14, a button 16, a first swing arm 17, a first spring shaft 18, a tension spring 111, and a second swing arm 112.

[0033] As shown in Figure 4 (a), the outer lock disc 11 is installed on the outer side of the cabin door 1, and the outer side surface of the outer lock disc 11 is provided with an outer handle groove in the shape of a long strip and a button groove in communication with the middle part of the lower side groove wall of the outer handle groove. The outer side surface of the outer lock disc 11 can also be flush with the outer side of the cabin door 1, which can meet the requirements of stealth design of a stealth helicopter.

[0034] The outer handle 12 is arranged in the outer handle groove of the outer lock disc 11, one end of the outer handle 12 is rotationally connected with the upper and lower side groove walls of the outer handle groove through a square shaft 13, the other end of the outer handle 12 is provided with the lock core 14, and the middle part of the lower edge of the outer handle 12 is provided with an insertion groove corresponding to the button groove and for the insertion of the protrusion of the button 16.

[0035] The lock core 14 is installed at the other end of the outer handle 12, the outer end of the lock core 14 has a lock hole for the insertion of a key, and the inner end of the lock core 14 is connected with a baffle 15 axially stopped by the internal structure of the outer lock disc 11. When the key is inserted into the lock core 14 and rotated, the baffle 15 can be rotated, and then when the outer handle 12 is placed in the outer handle groove and the baffle 15 is axially stopped by the internal structure of the outer lock disc 11, the locking of the outer handle 12 is realized, and when the baffle 15 is disengaged from the internal structure of the outer lock disc 11, the unlocking of the outer handle 12 is realized.

[0036] The button 16 is arranged in the button groove of the outer lock disc 11 and is rotationally connected with the two side groove walls of the button groove through a rotation shaft parallel to the outer handle groove. The button 16 has a protrusion, the volume of which is smaller than the insertion groove of the outer handle 12. When the outer handle 12 is arranged in the outer handle groove, the protrusion of the button 16 is inserted in the insertion groove of the outer handle 12 when the button 16 is not pressed, thereby serving as a lock for locking the outer handle 12 in the outer handle groove; when the button 16 is pressed, the protrusion of the button 16 will rotate with the button 16 and be separated from the insertion groove of the outer handle 12, thereby releasing the locking of the outer handle 12.

[0037] As shown in Fig. 1, Figure 4 (b), the first swing arm 17, the first spring shaft 18, the tension spring 111 and the second swing arm 112 are arranged on the inner side of the outer lock disc 11.

[0038] One end of the first swing arm 17 is connected with the square shaft 13, which prevents the relative rotation between the first swing arm 17 and the outer handle 12. The other end of the first swing arm 17 is provided with an arc-shaped sliding groove 1701 coaxially arranged with the square shaft 13.

[0039] The first spring shaft 18 is arranged perpendicularly to the square shaft 13. One end of the first spring shaft 18 is arranged in the boss formed on the inner side of the outer lock disc 11, and the first spring 19 is sleeved on the first spring shaft 18 and has two ends respectively abutting against the boss on the inner side of the outer lock disc 11 and the shaft shoulder formed on the middle part of the first spring shaft 18. The middle part of the first spring shaft 18 is connected with a sliding shaft 110 which is in sliding cooperation with the arc-shaped sliding groove 1701 of the first swing arm 17. The other end of the first spring shaft 18 is provided with a long slot hole 1801 extending in the axial direction, which is passed through by the second swing arm 112 and is in movable cooperation with the second swing arm 112.

[0040] The tension spring 111 is arranged parallel to the first spring shaft 18, one end of the tension spring 111 is connected with the boss on the inner side of the outer lock disc 11, and the other end is connected with the middle part of the first swing arm 17. The tension spring 111 is used to pull the first swing arm 17, so that the outer handle 12 connected with the first swing arm 17 through the square shaft 13 can automatically rotate an angle from the outer handle groove in the case that the lock cylinder 14 and the button 16 are both unlocked, thereby facilitating the operator to hold. The angle of the automatic rotation of the outer handle 12 is the same as the central angle corresponding to the arc-shaped sliding groove 1701 of the first swing arm 17.

[0041] The second swing arm 112 passes through the long slot hole 1801 of the first spring shaft 18, and the middle part of the second swing arm 112 is hinged on the inner side of the outer lock disc 11. The hinged part of the second swing arm 112 and the outer lock disc 11 is provided with the first torsion spring 113, and the two ends of the second swing arm 112 are respectively connected with the steel wire ropes for driving the two lock box assemblies 30 to act.

[0042] The working principle of the outer handle assembly 10 is as follows: when the operator needs to open the hatch 1 from outside, the key is inserted into the lock cylinder 14 and turned, so that the blocking piece 15 connected with the lock cylinder 14 is separated from the internal structure of the outer lock disc 11, and the lock cylinder 14 is unlocked to the outer handle 12. Then, the button 16 is pressed, so that the protrusion of the button 16 is separated from the insertion slot of the outer handle 12, and the button 16 is unlocked to the outer handle 12. At this time, the outer handle 12 is automatically turned out by an angle under the transmission of the first swing arm 17 pulled by the tension spring 111, and the operator can continue to turn out the outer handle 12 by hand. The outer handle 12 is driven to rotate around the hinge by the transmission of the square shaft 13, the first swing arm 17, the sliding shaft 110 and the first spring shaft 18 to overcome the elastic force of the first spring 19, so as to drive the second swing arm 112 to rotate, and then the second swing arm 112 pulls the steel wire ropes at both ends, so that the lock box assemblies 30 connected with the steel wire ropes at both ends are respectively unlocked to the two lock seat assemblies 40 on the hatch frame 2, and the hatch 1 can be opened.

[0043] When the operator removes the external force applied to the outer handle 12, the second swing arm 112 is reset under the action of the first torsional spring 113, and the first spring shaft 18 is reset under the action of the first spring 19. The outer handle 12 is kept in the popped-out position under the linkage action of the square shaft 13, the first swing arm 17, the sliding shaft 110 and the first spring shaft 18.

[0044] When it is needed to make the popped-out outer handle 12 return to the outer handle slot of the outer lock disc 11, the outer handle 12 is pushed inward to overcome the action force of the tension spring 111. At the same time when the outer handle 12 returns to the outer handle slot, the lower edge of the outer handle 12 will bring the inclined surface on the protrusion of the button 16, so that the protrusion is inserted into the insertion slot of the outer handle 12, and the button 16 is locked to the outer handle 12. Then, the key is used to operate the lock cylinder 14, so that the blocking piece 15 is turned to the position which is axially blocked by the internal structure of the outer lock disc 11, and the lock cylinder 14 is locked to the outer handle 12.

[0045] Figure 5 is a structural schematic view of the inner handle assembly 20, wherein (a) is an external schematic view of the inner handle assembly 20, (b) is an internal schematic view of the outer handle assembly, and (c) is a schematic view of the inner handle assembly 20 hidden behind the inner lock disc 21.

[0046] As shown in Figure 5 , the inner handle assembly 20 mainly comprises an inner lock disc 21, an inner handle 22, an insurance handle 23, an insurance blocking piece 24 and a second spring shaft 26.

[0047] As shown in Figure 5 (a), the inner lock disc 21 is installed on the inner side surface of the hatch 1, and the outer side surface of the inner lock disc 21 corresponds to the inner side surface of the hatch 1 and is provided with an inner handle slot and an insurance handle slot. The inner handle slot has an operation space for a hand to stretch into and pull out the inner handle 22.

[0048] The inner handle 22 is set in the inner handle groove of the inner lock plate 21. One end of the inner handle 22 is rotatably connected to the upper and lower side walls of the inner handle groove through a rotating shaft. The upper edge of the inner handle 22 is provided with a slot for the safety stop 24 to be inserted near one end.

[0049] like Figure 5 As shown in (a) to (c), the safety handle 23 is cylindrical and rotatably mounted in the safety handle slot of the inner lock disc 21 around its own axis. The outer end of the safety handle 23 has a handle for rotation, and the inner end of the safety handle 23 is connected to a safety stop block 24 that engages with the circumferential stop of the inner handle 22's slot. When the safety handle 23 is rotated, the safety stop block 24 is rotated, thereby locking the inner handle 22 when the safety stop block 24 engages with the slot of the inner handle 22, and unlocking the inner handle 22 when the safety stop block 24 disengages from the slot of the inner handle 22. A spring steel ball 25 is provided in the groove wall of the safety handle slot, and multiple positioning slots are distributed circumferentially on the safety handle 23 to engage with the spring steel ball 25. When the safety handle 23 is rotated to the corresponding position, the spring steel ball 25 engages in the corresponding positioning slot, achieving circumferential positioning of the safety handle 23.

[0050] The second spring shaft 26 passes through a protrusion formed inside the inner lock disc 21 and is arranged parallel to the first spring shaft 18 of the outer handle assembly 10. One end of the second spring shaft 26 is rotatably connected to one end of the inner handle 22 via a flat-headed shaft 28, which is arranged parallel to the pivot of one end of the inner handle 22. The second spring 27 is sleeved on the second spring shaft 26, with both ends abutting against the protrusion inside the inner lock disc 21 and the shoulder formed in the middle of the second spring shaft 26, respectively. The other end of the second spring shaft 26 is arranged corresponding to the second swing arm 112 of the outer handle assembly 10.

[0051] Figure 6 This is a schematic diagram showing the interaction between the outer handle assembly 10 and the inner handle assembly 20.

[0052] like Figure 5 and Figure 6As shown, the principle of the workpiece of the inner handle assembly 20: when the operator needs to open the hatch 1 from the cabin, first turn the safety handle 23, make the safety block 24 from the clamping groove of the inner handle 22, realize the unlocking of the safety handle 23 to the inner handle 22, and then put the inner handle 22 into the inner handle groove of the inner lock disc 21, pull the inner handle 22 to rotate outward, overcome the elastic force of the second spring 27 by the linkage of the second spring shaft 26 to push the second swing arm 112 of the outer handle assembly to rotate around the hinge, and then the second swing arm 112 pulls the steel wire rope at both ends, so that the lock box assembly 30 connected by the steel wire rope at both ends is respectively unlocked with the two lock seat assemblies 40 on the hatch frame 2, and the hatch 1 can be opened. Among them, the first spring shaft 18 has a long slot hole, and the second swing arm 112 rotating under the push of the second spring shaft 26 will slide along the long slot hole 1801, without moving the first spring shaft 18, so as not to affect the outer handle 12.

[0053] When the operator removes the external force applied to the inner handle 22, the second swing arm 112 will reset under the action of the first torsional spring 113, and the second spring shaft 26 will reset under the action of the second spring 27, and drive the inner handle 22 back to the inner handle groove of the inner lock disc 21. Then, turn the safety handle 23, make the safety block 24 into the clamping groove of the inner handle 22, that is, the locking of the safety handle 23 to the inner handle 22 can be realized.

[0054] Figure 7 It is a structural diagram of the lock box assembly 31, wherein (a) is an external schematic diagram of the lock box assembly 31, (b) is an internal schematic diagram of the lock box assembly 31 after hiding the lock box cover plate 3102, and (c) is an internal schematic diagram of the lock box assembly 31 after hiding the lock box body 3101.

[0055] As shown in the figure, Figure 7 Each lock box assembly 31 mainly includes a lock box 31, a lock hook 32, a stop block 34, and a steel wire rope.

[0056] The lock box 31 is installed on the side edge of the hatch 1, which is composed of a lock box body 3101 and a lock box cover plate 3102. The side of the lock box 31 corresponding to the inside of the hatch 1 is provided with a lock catch 3103, which is used for the lock shaft 42 of the lock seat assembly 40 to enter and cooperate with the lock hook 32. The outer surface of the lock box cover plate 3102 is provided with a block 31021, which is used to push the touch rod 44 of the lock seat assembly 40.

[0057] The lock hook 32 is hinged in the lock box 31, and the hinge of the lock hook 32 and the lock box 31 is provided with a second torsional spring 33. The lock box body 3101 is provided with two anti-collision columns 31011 for limiting the clockwise and counterclockwise rotation positions of the lock hook 32.

[0058] The stopper 34 is slidably arranged in an open-ended slide formed inside the lock box 31, the head of the stopper 34 can extend out of the opening of the slide to block the lock hook 32, the bottom of the stopper 34 is connected with a steel wire, the steel wire passes out of the other end of the slide and is connected with the end of the second swing arm 112 of the outer handle assembly 10, the end of the steel wire close to the stopper 34 is provided with an anti-abrasion stopper 35, the anti-abrasion stopper 35 and the stopper 34 are provided with a third spring 36 sleeved on the steel wire, the third spring 36 provides a force to make the stopper 34 extend out of the slide. The side of the slide is further provided with two limiting nails 37 to limit the sliding position of the stopper 34, the side of the stopper 34 is provided with two limiting grooves matched with the two limiting nails 37.

[0059] The working principle of the lock box assembly 31 is as follows: when the steel wire is not pulled, the stopper 34 extends out of the slide of the lock box 31 under the action of the third spring 36, and blocks the lock hook 32, so that the lock hook 32 is in the locked position; when the steel wire is pulled with a force overcoming the elastic force of the third spring 36, the stopper 34 retracts into the slide, and the lock hook 32 rotates around the hinge to the unlocked position under the action of the second torsion spring 33.

[0060] Figure 8 Fig. 4 is a structural schematic diagram of the lock seat assembly 40, wherein (a) is an external schematic diagram of the lock seat assembly 40, and (b) is an internal schematic diagram of the lock seat assembly 40.

[0061] As shown in Fig. 4, the lock seat assembly 40 mainly comprises a lock seat 41, two lock shafts 42, a touch rod 44, and a micro switch 46. Figure 8

[0062] The lock seat 41 is installed on the door frame 2 of the hatch 1, and has a cavity for arranging the touch rod 44 and the micro switch 46.

[0063] The two lock shafts 42 are arranged in parallel on the outer surface of the lock seat 41 and are distributed along the opening and closing direction of the hatch 1, and are connected by a strip-shaped pressing block 43.

[0064] The touch rod 44 extends through the cavity of the lock seat 41 along the opening and closing direction of the hatch 1, one end of the touch rod 44 corresponding to the outside of the hatch 1 is used for being pushed by the stop block 31021 of the lock box cover plate 3102 of the lock box assembly 31, and the part of the touch rod 44 located in the cavity is provided with a block-shaped trigger portion 4401, the fourth spring 45 sleeved on the touch rod 44 is arranged between the trigger portion 4401 and the side wall of the cavity of the lock seat 41, and the fourth spring 45 provides a force to reset the touch rod 44 after being pushed.

[0065] ​A microswitch 46 is installed inside the cavity of the lock seat 41, and the drive rod of the microswitch 46 is located on the movement path of the trigger part 4401 of the contact rod 44. When the drive rod of the microswitch 46 is triggered, the microswitch 46 sends a signal to the helicopter's control system, indicating the engagement status between the lock box assembly 31 and the lock seat assembly 40, i.e., the status of the door 1.

[0066] Figure 9 This is a schematic diagram of the lock box assembly 31 and the lock seat assembly 40 when locked, wherein (a) is a schematic diagram of the lock hook 32 of the lock box assembly 31 hooking the lock shaft 42 of the lock seat assembly 40, and (b) is a schematic diagram of the stop 31021 of the lock box assembly 31 abutting against the contact rod 44 of the lock seat assembly 40.

[0067] The working principle of the lock box assembly 31 and the lock seat assembly 40 is as follows: When it is necessary to lock the lock box assembly 31 and the lock seat assembly 40, the lock shaft 42 passively enters the lock latch 3103 of the lock box 31 and actuates the lock hook 32. At this time, as... Figure 9 As shown in (a), the locking hook 32 rotates around the hinge and hooks the locking shaft 42 located at the latch opening 3103. During the rotation of the locking hook 32, the stop block 34 is struck by the locking hook 32, and first briefly retracts, then resets under the action of the third spring 36 and blocks the locking hook 32, keeping the locking hook 32 in that position, thus keeping the hatch 1 and hatch frame 2 tightly closed. Meanwhile, as Figure 9 As shown in (b), the stop 31021 of the lock box cover 3102 pushes and abuts against the contact rod 44, causing the trigger part 4401 of the contact rod 44 to separate from the drive rod of the micro switch 46, and the fourth spring 45 is compressed, so that the pilot can know from the control system that the cabin door 1 is in the closed state.

[0068] When it is necessary to unlock the lock box assembly 31 and the lock seat assembly 40, the steel cables at both ends of the second swing arm 112 are pulled by pulling the outer handle 12 of the outer handle assembly 10 or the inner handle 22 of the inner handle assembly 20. At this time, the stop block 34 will retract into the slide of the lock box 31 under the action of the steel cables. The lock hook 32 rotates around the hinge to the unlock position under the action of the second torsion spring 33. The lock shaft 42 can be disengaged from the lock latch 3103 of the lock box 31, so the cabin door 1 can be opened. When the cabin door 1 is opened, the stop block 31021 of the lock box cover 3102 separates from the contact rod 44. The contact rod 44 is reset under the action of the fourth spring 45. The trigger part 4401 of the contact rod 44 touches the drive rod of the micro switch 46, and the pilot can know from the control system that the cabin door 1 is in the open state.

[0069] The role and effect of the embodiments

[0070] According to the cabin door locking mechanism for the helicopter, the outer handle assembly, the inner handle assembly, the lock box assembly and the lock seat assembly are included, wherein the outer handle assembly includes an outer lock disc, an outer handle, a button, a first swing arm, a first spring shaft with a first spring, a tension spring and a second swing arm, when the outer handle is unlocked, the outer handle is automatically turned out by an angle under the transmission of the tension spring pulling the first swing arm, which is convenient for the operator to hold, when the outer handle is continuously turned out, the second swing arm is driven to rotate through the linkage of the first swing arm and the first spring shaft, the second swing arm is pulled to pull the steel wire rope, and the lock box assembly can be unlocked with the lock seat assembly; the inner handle assembly includes an inner lock disc, an inner handle and a second spring shaft, the second spring shaft can drive the second swing arm to rotate under the driving of the inner handle, and the steel wire rope is pulled to make the lock box assembly be unlocked with the lock seat assembly. Therefore, the cabin door locking mechanism for the helicopter allows the outer handle to be kept in the outer handle slot of the outer lock disc in the normal state, and when the cabin door needs to be opened, the outer handle is automatically turned out by an angle, and then the outer handle is continuously turned out to realize the unlocking between the lock box assembly and the lock seat assembly, the unlocking between the lock box assembly and the lock seat assembly can also be realized through the inner handle, the overall operation and control effect is good, and the cabin door locking mechanism for the helicopter can be applied to the cabin door of a stealth helicopter.

[0071] The above embodiment is a preferred case of the present application and does not limit the protection scope of the present application.

Claims

1. A helicopter door locking mechanism, comprising an outer handle assembly, an inner handle assembly, and a lock box assembly for mounting on the door, and a lock seat assembly for mounting on the door frame, characterized in that: The external handle assembly includes an external lock disc, an external handle and a button disposed on the outer side of the external lock disc, a first swing arm disposed on the inner side of the external lock disc, a first spring shaft having a first spring, a tension spring, and a second swing arm. The outer handle is rotatably mounted on the outer lock disc, and one side edge has a slot for engaging the button. The button is rotatably mounted on the outer lock disc, and the button has a protrusion that allows it to be inserted into the slot to lock or disengaged from the slot to unlock as it rotates. One end of the first swing arm is connected to one end of the outer handle, and the other end is provided with an arc-shaped groove centered at the connection point. One end of the first spring shaft passes through a protrusion formed inside the outer lock disc, and a sliding shaft with a sliding engagement with the arc-shaped groove is provided in the middle. The other end is provided with an axially extending long slot that movably engages with the second swing arm. The first spring is mounted on the first spring shaft and provides a force to rotate the outer handle inward by cooperating with a boss on the inner side of the outer lock disc. The tension spring connects the inner side of the outer locking disc and the first swing arm, and provides a force to rotate the outer handle outward. The second swing arm passes through the elongated slot and is hinged in the middle to the inner side of the outer lock plate. The end of the second swing arm is connected to the lock box assembly by a steel wire rope. The inner handle assembly includes an inner lock plate, an inner handle disposed on the outer side of the inner lock plate, and a second spring shaft disposed on the inner side of the inner lock plate and hinged to the inner handle. The second spring shaft can drive the second swing arm to rotate and slide along the long slot of the first spring shaft under the action of the inner handle. When the outer handle is unlocked, it automatically rotates outward by an angle equal to the central angle of the arc-shaped groove under the transmission action of the tension spring pulling the first swing arm. When the second swing arm is driven to rotate by the first spring shaft or the second spring shaft and pulls the steel wire rope, the lock box assembly can be unlocked from the lock seat assembly under the action of the steel wire rope.

2. The helicopter door locking mechanism according to claim 1, characterized in that: in, The external handle assembly also includes a lock cylinder and a stop plate. The lock cylinder is mounted on the outer handle and its inner end is connected to the stop plate. The baffle is driven to rotate by the lock cylinder, and by cooperating with the inner axial stop of the outer lock disc, it locks or unlocks the outer handle and the outer lock disc.

3. The helicopter door locking mechanism according to claim 1, characterized in that: in, The inner handle assembly also includes a safety handle and a safety stop. The inner handle is provided with a slot for the safety stop to engage. The safety handle is located on the outer surface of the inner lock disc and its inner end is connected to the safety stop block. The safety stop is rotated by the safety handle, and locks or unlocks the inner handle by engaging or disengaging from the slot.

4. The helicopter door locking mechanism according to claim 3, characterized in that: in, The outer side of the inner lock disc is provided with a safety handle groove. The safety handle slot is equipped with spring steel balls on its groove wall. The safety handle has multiple positioning grooves distributed circumferentially along its upper edge, which are used to position and engage with the spring steel balls.

5. The helicopter door locking mechanism according to claim 1, characterized in that: in, The second spring shaft passes through a protrusion formed inside the inner lock disc. One end of the second spring shaft is hinged to the inner handle, and the other end is used to drive the second swing arm to rotate. A second spring is provided on the second spring shaft, which provides a force to rotate the inner handle inward by cooperating with a boss on the inner side of the inner lock disc.

6. The helicopter door locking mechanism according to claim 1, characterized in that: in, The outer side of the outer lock disc is provided with an outer handle groove and a button groove that communicates with one side wall of the outer handle groove. The outer handle is rotatably connected within the outer handle slot. The button is rotatably connected within the button slot. A first torsion spring is provided at the hinge joint between the second swing arm and the outer locking disc; The outer side of the inner lock disc is provided with an inner handle groove. The inner handle is rotatably connected within the inner handle slot.

7. The helicopter door locking mechanism according to claim 1, characterized in that: in, The lock box assembly includes a lock box, a lock hook, a second torsion spring, a stop block, and a third spring. The lock box has a latch on one side corresponding to the inner side of the hatch, which allows the lock shaft of the lock seat assembly to enter and exit and engage with the lock hook. The interior of the lock box has a slide rail with one end open and anti-collision posts that limit the clockwise and counterclockwise rotation of the lock hook. The lock hook is hinged inside the lock box, and a second torsion spring is provided at the hinge. The stop block is slidably disposed within the slide rail, the head of the stop block protruding from the opening of the slide rail to block the locking hook, and the bottom of the stop block is connected to the wire rope. The third spring is disposed within the slide rail and provides a force that causes the stop block to extend out of the slide rail opening; The lock seat assembly includes a lock seat and a lock shaft disposed on the lock seat; When the locking shaft is located in the latch of the lock box and is hooked by the locking hook, the head of the stop block extends out of the opening of the slide and blocks the locking hook, and the lock box assembly and the lock seat assembly are in a locked state. When the stop block is pulled by the wire rope and retracts into the slide, the lock hook rotates under the action of the second torsion spring and disengages from the lock shaft, and the lock box assembly and the lock seat assembly are in an unlocked state.

8. The helicopter door locking mechanism according to claim 7, characterized in that: in, The end of the wire rope near the stop block is provided with an anti-wear stop sleeve. The third spring is sleeved on the wire rope and positioned between the anti-wear stop sleeve and the stop block.

9. The helicopter door locking mechanism according to claim 7, characterized in that: in, The lock base assembly also includes a contact rod, a fourth spring, and a micro switch. The lock seat has a cavity. The contact rod extends through the cavity along the opening and closing direction of the hatch, and the portion of the contact rod located inside the cavity is provided with a trigger portion for triggering the micro switch. The fourth spring is sleeved on the contact rod and disposed between the trigger portion and the side wall of the cavity. The fourth spring provides a force to reset the contact rod. The micro switch is disposed within the cavity and its drive rod is disposed on the movement path of the trigger portion of the contact rod. The outer surface of the lock box is provided with a stop for moving the contact rod.

10. The helicopter door locking mechanism according to claim 1, characterized in that: in, The number of lock box assemblies is two, and they are respectively installed on both sides of the hatch. The two lock box assemblies are respectively connected to both ends of the second swing arm by steel wire ropes. The number of lock seat assemblies is two, and they are respectively installed on both sides of the door frame.

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