Helicopter sliding passenger door

Abstract

The application provides a helicopter sliding passenger cabin door, and relates to the field of aviation machinery, which comprises a door, upper and lower sliding rails for the door to slide, a door frame matched with the door to open and close, and a locking mechanism for locking or unlocking between the door and the door frame, wherein the locking mechanism comprises an upper lock box assembly, a lower lock box assembly, a connecting rod assembly, an upper lock seat assembly, a lower lock seat assembly, a hook assembly and a hook limiting assembly; the upper lock box assembly and the upper lock seat assembly and the lower lock box assembly and the lower lock seat assembly are locked and matched to form lock points, two lock points ensure the stability of the door locking, and the force required for the operation of the hook is small, which is very convenient; the connecting rod assembly with rigid connection between the upper lock box assembly and the lower lock box assembly is used for transmission without motion stroke difference, which is synchronous, sensitive and reliable; the hook assembly and the hook limiting assembly are matched to limit the forward sliding of the door, so that the door can be kept in the open state.

Description

Technical Field

[0001] This invention relates to the field of aviation machinery manufacturing, and specifically to a helicopter sliding cabin door. Background Technology

[0002] The helicopter cabin door is the main passageway for personnel and cargo to enter and exit the helicopter. To ensure maximum opening size, the cabin door typically adopts a sliding door structure. The locking mechanism of the helicopter cabin door is used by personnel inside the helicopter and on the ground to open and close the cabin door from the inside and outside of the helicopter. During helicopter flight, the cabin door needs to withstand aerodynamic loads in the vertical direction and flight acceleration loads in the sliding direction. To ensure the locking stability of the cabin door, the locking mechanism of the helicopter cabin door usually adopts a multi-pin locking point structure, that is, multiple pins are designed in the front, top, and bottom of the cabin door to ensure the stability of the cabin door.

[0003] The existing helicopter cabin doors use a multi-pin linkage locking mechanism, which requires considerable force to open and close. Furthermore, the locking mechanism has difficulties in synchronizing multiple locking points, directly affecting the convenience of opening and closing the cabin door and posing safety hazards. Summary of the Invention

[0004] This invention was made to solve the above-mentioned problems, and its purpose is to provide a helicopter sliding cabin door.

[0005] This invention provides a helicopter sliding cabin door, characterized by comprising a cabin door, an upper sliding rail and a lower sliding rail for sliding the cabin door, a door frame that cooperates with the opening and closing of the cabin door, and a locking mechanism for locking or unlocking the cabin door and the door frame. The locking mechanism includes: an upper lock box assembly comprising an upper lock box mounted on the cabin door and an upper lock hook hinged to the upper lock box; a lower lock box assembly comprising a lower lock box mounted on the cabin door, a lower lock hook hinged to the lower lock box, and an unlocking mechanism for manually operating to drive the lower lock hook to rotate; and a linkage assembly rigidly connected to the upper lock hook and the unlocking mechanism. Between; the upper locking seat assembly, including an upper locking seat mounted on the door frame and an upper locking pin mounted on the upper locking seat, the upper locking pin cooperating with the upper locking hook to lock or unlock; the lower locking seat assembly, including a lower locking seat mounted on the door frame and a lower locking pin mounted on the lower locking seat, the lower locking pin cooperating with the lower locking hook to lock or unlock; the hook assembly, connected to the unlocking mechanism and driven by the unlocking mechanism to perform a linkage action; and the hook limiting assembly, mounted on the outer surface of the fuselage skin behind the door, used to limit the forward sliding of the door by cooperating with the hook assembly as the door moves backward to its current position.

[0006] The helicopter sliding cabin door provided by the present invention may also have the following features: the unlocking mechanism includes an outer handle, a transmission cam, and an inner handle that are coaxially connected and hinged to the lower lock box. The transmission cam drives the lower lock hook to rotate under the action of the outer handle or the inner handle, and the transmission cam is connected to a second spring for providing a force to make it rotate and disengage from the lower lock hook.

[0007] The helicopter sliding cabin door provided by the present invention may also have the following features: the hook assembly includes a first swing arm, a second swing arm, and a hook that are hinged in sequence, the first swing arm being connected to the unlocking mechanism; the hook limiting assembly includes a swing arm seat mounted on the fuselage skin, a third swing arm hinged to the swing arm seat, and a third spring disposed at the hinge of the third swing arm, the third spring being used to provide a force to reset the third swing arm, the third swing arm first being rotated by being struck by the hook that moves backward, causing the hook to move to its rear, and then being reset by the action of the third spring, thus limiting the forward movement of the hook.

[0008] The helicopter sliding cabin door provided by the present invention may also have the following features: the lower locking hook is connected to a first spring for providing a force to rotate it and press it against the lower locking pin, and the upper locking hook is connected to a fourth spring for providing a force to rotate it and press it against the upper locking pin.

[0009] The helicopter sliding cabin door provided by the present invention may also have the following features: the linkage assembly includes an upper linkage connected to the upper locking hook, a lower linkage connected to the unlocking mechanism, a pull rod connected between the upper linkage and the lower linkage, a spring bracket installed on the door frame and through which the pull rod passes, and a fifth spring sleeved on the pull rod and abutting between the step surface of the pull rod and the spring bracket, the fifth spring being used to prevent jamming during transmission between the upper linkage, the pull rod, and the lower linkage.

[0010] The helicopter sliding cabin door provided by the present invention may also have the following features: the lower lock assembly further includes a micro switch contact rod movably mounted on the lower lock, a micro switch with its contact point located on the movement path of the micro switch contact rod, a sixth spring sleeved on the micro switch contact rod and abutting between the stepped surface of the micro switch contact rod and the lower lock, and a prompting device electrically connected to the micro switch. The micro switch contact rod is moved by a lower lock hook hooked on the lower lock post, and the sixth spring is used to provide a force to reset the micro switch contact rod.

[0011] The helicopter sliding cabin door provided by the present invention may also have the following features: a front baffle that cooperates with the door frame in the vertical direction of the door is provided on the front edge of the door, and a lower baffle that cooperates with the lower slide rail in the vertical direction of the door is provided on the lower edge of the door.

[0012] The helicopter sliding cabin door provided by the present invention may also have the following features: an upper roller that cooperates with an upper slide rail is provided on the upper edge of the door, the axis of the upper roller is set along the vertical direction of the door, and a lower roller that cooperates with a lower slide rail is provided on the lower edge of the door, the axis of the lower roller is perpendicular to the vertical direction of the door.

[0013] The helicopter sliding cabin door provided by the present invention may also include the following feature: a rear door limiting mechanism, installed on the inner side of the fuselage skin behind the door, for limiting the rearward sliding position of the door.

[0014] Furthermore, the rear door limiting mechanism includes a housing mounted on the fuselage skin with an opening in the cavity, a buffer block bracket locked in the cavity or released from the opening, a buffer block mounted on the buffer block bracket, and a button for locking or releasing the buffer block bracket, the buffer block being used to block the rear edge of the door.

[0015] The role and effect of invention

[0016] According to the present invention, the locking mechanism for the helicopter sliding cabin door between the door and the door frame includes an upper locking box assembly, a lower locking box assembly, a connecting rod assembly, an upper locking seat assembly, a lower locking seat assembly, a hook assembly, and a hook limiting assembly. Because the upper locking box assembly and the upper locking seat assembly, as well as the lower locking box assembly and the lower locking seat assembly, all use a hook-locking engagement to form locking points, this helicopter sliding cabin door is designed with two locking points, ensuring the stability of the door locking. The hook-locking engagement of the locking points requires less force during operation, making it very convenient. Because the upper and lower locking box assemblies are rigidly connected by a connecting rod assembly for transmission without travel difference, the upper and lower locking box assemblies operate synchronously, and their movements are sensitive and reliable. Because the hook assembly and the hook limiting assembly limit each other, restricting the door from sliding forward, the door can remain in the open state, meeting the usage requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the outer structure of the helicopter sliding cabin door in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the inner structure of a helicopter sliding cabin door in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection between the hatch and the upper slide rail in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the connection between the hatch and the lower rail in an embodiment of the present invention;

[0021] Figure 5This is a schematic diagram of the locking mechanism in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the outer structure of the lower lock box assembly and the hook assembly when they are engaged with the hook limiting assembly in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the inner structure of the lower lock box assembly and the hook assembly when they are engaged with the hook limiting assembly in an embodiment of the present invention;

[0024] Figure 8 yes Figure 7 A structural diagram showing the concealed lower lock box and swing arm seat;

[0025] Figure 9 This is a schematic diagram of the outer structure of the locking box assembly and the connecting rod assembly in an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the inner structure of the locking box assembly and the connecting rod assembly in an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram of the upper locking seat assembly in an embodiment of the present invention;

[0028] Figure 12 This is a schematic diagram of the lower lock seat assembly in an embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram of the structure of the rear door limiting mechanism in an embodiment of the present invention;

[0030] Figure 14 This is a side view of the hatch rear limiting mechanism after it is hidden in the housing in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 Helicopter sliding cabin door; 10 Cabin door; 11 Upper roller; 12 Lower roller; 13 Front baffle; 14 Lower baffle; 20 Upper slide rail; 30 Lower slide rail; 40 Door frame; 50 Locking mechanism; 51 Upper lock box assembly; 511 Upper lock box; 512 Upper lock hook; 513 Fourth spring; 514 First limit post; 515 Second reinforcing rib; 52 Lower lock box assembly; 521 Lower lock box; 522 Lower lock hook; 523 Outer handle; 524 Transmission cam; 525 Inner handle; 526 First spring; 527 Second spring; 528 First reinforcing rib; 53 Linkage assembly; 531 Upper link; 532 Pull rod; 533 Lower link; 534 Spring bracket; 535 Fifth spring; 5 4. Locking seat assembly; 541. Locking seat; 542. Locking post; 543. Upper rotating sleeve; 55. Lower locking seat assembly; 551. Lower locking seat; 552. Lower locking post; 553. Lower rotating sleeve; 554. Micro switch contact rod; 555. Micro switch; 556. Sixth spring; 56. Hook assembly; 561. First swing arm; 562. Second swing arm; 563. Hook; 57. Hook limiting assembly; 571. Swing arm seat; 572. Third swing arm; 573. Third spring; 574. Second limiting post; 60. Rear door limiting mechanism; 61. Housing; 62. Buffer block bracket; 63. Buffer block; 64. Button; 641. Pressing part; 642. Hook part; 65. Eighth spring; 66. Third limiting post; 67. Fourth limiting post. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments are described in detail with reference to the accompanying drawings.

[0034] In this application, "front" and "forward" refer to the direction in which the hatch closes towards the door frame, while "rear" and "rear" refer to the direction in which the hatch opens away from the door frame.

[0035] Example

[0036] Figure 1 and Figure 2 These are schematic diagrams of the outer and inner structures of the helicopter sliding passenger door 100.

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a helicopter sliding cabin door 100, mainly including a door 10, an upper slide rail 20, a lower slide rail 30, a door frame 40, and a locking mechanism 50. The door 10 is slidably mounted on the upper slide rail 20 and the lower slide rail 30, both of which are mounted on the helicopter fuselage. The door frame 40 is mounted on the fuselage and engages with the front edge of the door 10 for opening and closing. The locking mechanism 50 is mounted on the door 10 and the door frame 40, and is used to lock or unlock the door 10 and the door frame 40.

[0038] Figure 3 This is a schematic diagram of the connection between the hatch 10 and the upper slide rail 20. Figure 4 This is a schematic diagram of the connection between the hatch 10 and the lower rail 30.

[0039] like Figure 3 As shown, the upper edge of the hatch 10 is provided with an upper roller 11 that cooperates with the upper slide rail 20. Figure 4 As shown, the lower edge of the door 10 is provided with a lower roller 12 that cooperates with the lower slide rail 30. The axis of the upper roller 11 is set at an angle to the axis of the lower roller 12. This ensures that the door 10 can slide along the upper slide rail 20 and the lower slide rail 30, while preventing the door 10 from falling off the upper slide rail 20 and the lower slide rail 30. In this embodiment, the axis of the upper roller 11 is perpendicular to the axis of the lower roller 12, and the axis of the upper roller 11 is set along the vertical direction of the door 10, while the axis of the lower roller 12 is perpendicular to the vertical direction of the door 10. Of course, the degree of freedom of the door 10 in the vertical direction is itself limited by the helicopter fuselage structure.

[0040] To limit the aerodynamic loads on the hatch 10 in the vertical direction, such as Figure 3 As shown, a front baffle 13 is provided on the front edge of the hatch 10, which cooperates with the door frame 40 in the vertical direction of the hatch 10, such as... Figure 4 As shown, a lower baffle 14 is provided on the lower edge of the door 10, which cooperates with the lower slide rail 30 in the vertical direction of the door 10. When the door 10 is subjected to aerodynamic load in its vertical direction, the front baffle 13 is blocked by the door frame 40, and the lower baffle 14 is blocked by the lower slide rail 30, thereby ensuring the stability of the door 10 in the load direction during helicopter flight.

[0041] Figure 5 This is a schematic diagram of the locking mechanism 50.

[0042] like Figure 5 As shown, the locking mechanism 50 includes an upper lock box assembly 51, a lower lock box assembly 52, a connecting rod assembly 53, an upper lock seat assembly 54, a lower lock seat assembly 55, a hook assembly 56, and a hook limiting assembly 57. Combined with... Figure 1 and Figure 2Both the upper lock box assembly 51 and the lower lock box assembly 52 are mounted on the hatch 10. They are connected via a linkage assembly 53. The lower lock box assembly 52 includes a manually operated unlocking mechanism. Both the upper lock seat assembly 54 and the lower lock seat assembly 55 are mounted on the door frame 40 and cooperate with the upper lock box assembly 51 and the lower lock box assembly 52 respectively to lock or unlock. The upper lock box assembly 51 and the upper lock seat assembly 54 form the upper locking point, and the lower lock box assembly 52 and the lower lock seat assembly 55 form the lower locking point. These two locking points ensure the reliability of the locking mechanism 50; that is, if one locking point fails, the locking mechanism 50 can still lock the hatch 10 to the door frame 40 through the other locking point. The hook assembly 56 is connected to the unlocking mechanism of the lower lock seat assembly 55 and is driven by the unlocking mechanism. The hook limiting assembly 57 is mounted on the outer surface of the fuselage skin behind the hatch 10, as shown in the figure. Figure 1 The hook limiting assembly 57 is used to cooperate with the hook assembly 56, which moves backward as the hatch 10 moves to its current position, to limit the forward sliding of the hatch 10, thereby ensuring that the hatch 10 remains in the open state. It should be noted that... Figure 5 The position of the hook limiting component 57 is shown to illustrate its interaction with the hook component 56.

[0043] In this embodiment, two locking points are arranged in the middle of the hatch 10 and the door frame 40. Considering the ergonomic requirements of the operator, that is, the most comfortable height for the operator's hands to operate in the hatch 10 (the height of the hands in a semi-squatting state is 500-650mm), the height of the lower locking point is designed to be 576mm. The two locking points are also arranged according to the principle of symmetry. The distance from the upper locking point to the upper slide rail 20 and the distance from the lower locking point to the lower slide rail 30 are both designed to be 507mm.

[0044] Among them, the structure of the lower lock box assembly 52, hook assembly 56, and hook limit assembly 57 is the more important part of the locking mechanism 50, and will be described in detail below.

[0045] Figure 6 and Figure 7 These are schematic diagrams of the outer and inner structures of the lower lock box assembly 52 and hook assembly 56 when they are engaged with the hook limiting assembly 57.

[0046] like Figure 6 and Figure 7As shown, the lower lock box assembly 52 mainly includes a lower lock box 521, a lower lock hook 522, an unlocking mechanism, and a first spring 526. The lower lock box 521 is mounted on the hatch 10. The lower lock hook 522 is hinged to the lower lock box 521 at its middle. One end of the lower lock hook 522 is a free end and is hook-shaped, which cooperates with the lower lock seat assembly 55 to lock or unlock. The other end of the lower lock hook 522 is driven by the unlocking mechanism. The unlocking mechanism drives the other end of the lower lock hook 522 to rotate the lower lock hook 522 around the hinge, thereby disengaging the free end of the lower lock hook 522 from the lower lock seat assembly 55 to achieve unlocking. The two ends of the first spring 526 are respectively connected to the other end of the lower locking hook 522 and the lower locking box 521. The first spring 526 is used to provide a force to make the lower locking hook 522 rotate and the free end press down, so that the free end of the lower locking hook 522 is hooked on the lower locking seat assembly 55 and locked in the normal state when it is not driven by the unlocking mechanism. In this embodiment, the first spring 526 is a compression spring.

[0047] The unlocking mechanism includes an outer handle 523, a transmission cam 524, and an inner handle 525, all coaxially connected and hinged to the lower lock box 521. The outer handle 523 is located on the outer side of the hatch 10 and employs a handle structure similar to a standard door handle. The inner handle 525 is located on the inner side of the hatch 10 and includes a handle base and a handle. The handle base is axial and radially positioned along the hinge point, while the handle is semi-circular and rotatably connected to the handle base. This design provides the inner handle 525 with an additional degree of freedom, allowing it to be folded and occupy less space. The transmission cam 524 engages with the other end of the lower lock hook 522. Specifically, the transmission cam 524, driven by either the outer handle 523 or the inner handle 525, presses down on the other end of the lower lock hook 522, causing the free end of the lower lock hook 522 to lift and disengage from the lower lock seat assembly 55, thus unlocking the device.

[0048] The lower lock box assembly 52 also includes a second spring 527. The two ends of the second spring 527 are connected to the transmission cam 524 and the lower lock box 521, respectively. The second spring 527 is used to provide a force to rotate the transmission cam 524 and disengage it from the other end of the lower lock hook 522. This ensures that the transmission cam 524 is reset in time and prevents the lower lock hook 522 from being unable to hook onto the lower lock seat assembly 55 under normal conditions due to the action of the transmission cam 524. This ensures that the hatch 10 and the door frame 40 are locked. In this embodiment, the second spring 527 is a tension spring.

[0049] To ensure the functionality and performance of the lower locking box assembly 52 while also considering lightweight requirements, in this embodiment, the lower locking box 521 is a non-primary load-bearing structure, made of aluminum alloy 7075-T7351, heat-treated according to AMS-QQ-A-250 / 12, and designed as a thin-walled structure with a wall thickness of 2mm. Furthermore, to ensure the transmission of the structural locking load, the lower locking box 521 is designed with multiple first reinforcing ribs 528 to increase strength. See [link to relevant documentation]. Figure 6The lower locking hook 522 and transmission cam 524 are the main load-bearing structures, made of 05Cr17Ni4Cu4Nb stainless steel, heat-treated to H550, which yields high mechanical properties and a tensile strength of 1180±100MPa. Furthermore, to ensure the structural weight design specifications, the surface of the lower locking hook 522 is designed with weight-reducing grooves. Figure 6 .

[0050] Figure 8 yes Figure 7 A schematic diagram of the structure after concealing the lower lock box 521 and the swing arm seat 571.

[0051] like Figures 6 to 8 As shown, the hook assembly 56 includes a first swing arm 561, a second swing arm 562, and a hook 563. One end (or head end) of the first swing arm 561 is hinged to the transmission cam 524, and the other end is hinged to one end of the second swing arm 562. The other end of the second swing arm 562 is coaxially connected to one end of the hook 563 and hinged to the lower lock box 521. The other end (or tail end) of the hook 563 is hook-shaped and used for limiting engagement with the hook limiting assembly 57. The hook limiting assembly 57 includes a swing arm seat 571, a third swing arm 572, and a third spring 573. The swing arm seat 571 is mounted on the outer surface of the fuselage skin behind the hatch 10. The third swing arm 572 is hinged to the swing arm seat 571, and the third spring 573 is provided at the hinge point. The third spring 573 is used to provide a force to reset the third swing arm 572. In this embodiment, the third spring 573 is a torsion spring. The third swing arm 572 is limited to the other end of the hook 563. The hook limiting assembly 57 also includes a second limiting post 574, which is mounted on the swing arm seat 571. The third swing arm 572 has an arc-shaped hole that mates with the second limiting post 574. The second limiting post 574 mates with the arc-shaped hole to limit the rotation range of the third swing arm 572.

[0052] The working principle of the hook assembly 56 and the hook limiting assembly 57 is as follows: When the hook assembly 56 moves to the hook limiting assembly 57 along with the opened hatch 10, the other end of the hook 563 moves behind the third swing arm 572 of the hook limiting assembly 57 by impacting it. Then, the third swing arm 572, which has rotated due to the impact, is reset by the action of the third spring 573, thereby restricting the other end of the hook 563 from moving forward. Thus, the hatch 10 cannot slide forward from this point and remains in the open state. When it is necessary to release the limit, the outer handle 523 or the inner handle 525 is rotated, and the hatch 10 can be pulled backward at the same time. This causes the other end of the hook 563 to rotate above the third swing arm 572 under the linkage of the transmission cam 524, the first swing arm 561, and the second swing arm 562. This releases the limit of the third swing arm 572 on the other end of the hook 563, and the hatch 10 can slide forward to close.

[0053] Figure 9 and Figure 10 These are schematic diagrams of the outer and inner structures of the locking box assembly 51 and the connecting rod assembly 53, respectively.

[0054] like Figure 9 and Figure 10 As shown, the locking box assembly 51 includes a locking box 511, a locking hook 512, and a fourth spring 513. The locking box 511 is mounted on the hatch 10. The middle part of the locking hook 512 is hinged to the locking box 511. One end of the locking hook 512 is a free end and is hook-shaped to cooperate with the locking seat assembly 54 to lock or unlock. The other end of the locking hook 512 is driven by the connecting rod assembly 53. When the locking hook 512 rotates around the hinge due to the other end being driven by the connecting rod assembly 53, its free end disengages from the locking box assembly 51 to unlock. The two ends of the fourth spring 513 are respectively connected to the other end of the locking hook 512 and the locking box 511. The fourth spring 513 is used to provide a force to make the locking hook 512 rotate and the free end press down, so that the free end of the locking hook 512 is hooked on the locking seat assembly 54 and locked in the normal state when it is not driven. In this embodiment, the fourth spring 513 is a compression spring.

[0055] To ensure the functionality and performance of the locking box assembly 51 while also considering lightweight requirements, in this embodiment, the locking box 511 is a non-primary load-bearing structure, made of aluminum alloy 7075-T7351, heat-treated according to AMS-QQ-A-250 / 12, and designed as a thin-walled structure with a wall thickness of 2mm. Furthermore, to ensure the transmission of the locking load, a second reinforcing rib 515 is designed on the locking box 511 to increase strength. The locking hook 512 is the primary load-bearing structure, made of stainless steel 05Cr17Ni4Cu4Nb, heat-treated according to H550, achieving high mechanical properties with a tensile strength of 1180±100MPa. To ensure the structural weight design specifications, a weight-reducing groove is designed on the surface of the locking hook 512. In addition, the locking box assembly 51 also includes a first limiting post 514, which is installed on the locking box 511 to limit the rotational position of the locking hook 512 during unlocking.

[0056] The linkage assembly 53 includes an upper linkage 531, a pull rod 532, a lower linkage 533, a spring bracket 534, and a fifth spring 535. The upper linkage 531, pull rod 532, and lower linkage 533 are connected sequentially from top to bottom. The upper end of the upper linkage 531 is hinged to the other end of the upper locking hook 512. The lower end of the lower linkage 533 can be hinged to the transmission cam 524 or to the other end of the lower locking hook 522. In this embodiment, the lower end of the lower linkage 533 is hinged to the transmission cam 524. Pull rod 532 passes through spring bracket 534, which is mounted on door frame 40. Fifth spring 535 is sleeved on pull rod 532, with its two ends abutting against the stepped surface of pull rod 532 and spring bracket 534, respectively. Fifth spring 535 is used to prevent jamming during transmission between upper connecting rod 531, pull rod 532, and lower connecting rod 533, which would affect the smoothness of the linkage between upper locking box assembly 51 and lower locking box assembly 52. ​​The entire linkage assembly 53 is rigidly connected with no loss of motion travel, so there is no difference in motion travel between upper and lower locking hooks.

[0057] Figure 11 This is a schematic diagram of the upper locking seat assembly 54 of the locking mechanism 50.

[0058] like Figure 11 As shown, the locking seat assembly 54 mainly includes a locking seat 541 and a locking pin 542. The locking seat 541 is mounted on the door frame 40 and corresponds to the locking hook 512 of the locking box assembly 51. The locking pin 542 is mounted on the locking seat 541 so that the free end of the locking hook 512 can be hooked onto it to achieve locking. The locking pin 542 can rotate around its own axis, which can convert the friction between the locking pin 542 and the locking hook 512 into rolling friction, effectively reducing friction and improving the sensitivity of the engagement between the locking pin 542 and the locking hook 512.

[0059] Because the locking pin 542 is prone to wear during use, the locking seat assembly 54 also includes an upper rotating sleeve 543 fitted onto the locking pin 542 to protect it. When the upper rotating sleeve 543 fails due to excessive wear, it can simply be removed and replaced, improving maintenance convenience.

[0060] Figure 12 This is a schematic diagram of the lower locking seat assembly 55 of the locking mechanism 50.

[0061] like Figure 12As shown, the lower lock seat assembly 55 mainly includes a lower lock seat 551 and a lower lock pin 552. The lower lock seat 551 is installed on the door frame 40, and the lower lock pin 552 is installed on the lower lock seat 551 so that the free end of the lower lock hook 522 can be hooked on it to achieve locking. The lower lock pin 552 can rotate around its own axis, and a lower rotating sleeve 553 can be fitted on the lower lock seat 551. The functions of the lower lock pin 552 and the lower rotating sleeve 553 are the same as those of the upper lock pin 542 and the upper rotating sleeve 543, which will not be elaborated here.

[0062] The lower locking seat assembly 55 also includes a micro switch contact rod 554, a micro switch 555, and a sixth spring 556. The micro switch contact rod 554 is slidably mounted on the lower locking seat 551 and located below the lower locking post 552. The upper end of the micro switch contact rod 554 is pushed by the free end of the lower locking hook 522 hooked on the lower locking post 552. The micro switch 555 is mounted on the lower locking seat 551, and its contacts are located along the movement path of the micro switch contact rod 554. The micro switch 555 can be electrically connected to a prompting device for indicating the open / closed status of the locking mechanism 50. This prompting device can be an indicator light and can be installed in the helicopter cockpit to facilitate the pilot's monitoring of the open / closed status of the door 10 from inside the cockpit. The sixth spring 556 is used to provide the force to reset the micro switch contact 554. In this embodiment, the sixth spring 556 is a compression spring, which is sleeved on the micro switch contact 554 and its two ends abut against the stepped surface of the micro switch contact 554 and the lower lock seat 551, respectively.

[0063] When the free end of the lower locking hook 522 is hooked onto the lower locking post 552, the micro switch contact rod 554 moves away from the lower locking post 552 due to the push of its upper end by the free end of the lower locking hook 522. During this movement, the micro switch contact rod 554 contacts and triggers the contact of the micro switch 555, causing the micro switch 555 to be in the closed state. The indicating device then indicates that the locking mechanism 50 is in the locked state. During this process, the sixth spring 556 is compressed. When the free end of the lower locking hook 522 disengages from the lower locking post 552, the micro switch contact rod 554 returns to its original position under the elastic force of the sixth spring 556. The contact between the micro switch contact rod 554 and the micro switch 555 is broken, and the indicating device then indicates that the locking mechanism 50 is in the unlocked state.

[0064] Figure 13 This is a schematic diagram of the limit mechanism. Figure 14 This is a side view of the limiting mechanism hidden in the housing 61.

[0065] Because the sliding passenger cabin door 10 of this helicopter may collide with the equipment door, which may be open, during its backward sliding process, causing structural damage, in order to avoid malfunction, Figure 2As shown, the helicopter sliding passenger cabin door 100 also includes a rear door limiting mechanism 60. The rear door limiting mechanism 60 is installed on the inner side of the fuselage skin behind the door 10 (or in front of the equipment door). The rear door limiting mechanism 60 is used to limit the rearward sliding position of the door 10, that is, by reducing the opening range of the door 10, it prevents the door 10 from hitting the equipment door.

[0066] like Figure 13 and Figure 14 As shown, the rear limiting mechanism 60 of the hatch includes a housing 61, a buffer block bracket 62, a seventh spring, a buffer block 63, a button 64, and an eighth spring 65. The housing 61 is installed on the inner side of the fuselage skin behind the hatch 10 (or in front of the equipment hatch). The housing 61 has an open cavity, and the buffer block bracket 62, the buffer block 63, and the button 64 are all disposed in the cavity. In this embodiment, the housing 61 has two openings communicating with the cavity, one opening corresponding to the buffer block bracket 62 and the buffer block 63, and the other opening corresponding to the button 64. The middle part of the buffer block bracket 62 is hinged to the housing 61, and a seventh spring is provided at the hinge. The seventh spring is used to provide a force to make the buffer block bracket 62 rotate out of the opening. In this embodiment, the seventh spring is a torsion spring. A buffer block 63 is installed on the end of the buffer block bracket 62 away from the button 64, and the other end of the buffer block bracket 62 near the button 64 cooperates with the button 64. When the buffer block bracket 62 rotates around the hinge, the buffer block 63 rotates out of the opening or back into the cavity under the action of the buffer block bracket 62. Button 64 includes a pressing part 641 and a hook part 642 connected together. The pressing part 641 is pressed by a person. The hook part 642 cooperates with the other end of the buffer block bracket 62 to hook or release. The connection 1 between the pressing part 641 and the hook part 642 is hinged to the housing 6, and an eighth spring 65 is provided at the hinge. The eighth spring 65 is used to provide a force to reset button 64 and a force to hook the hook part 642 of button 64 onto the other end of buffer block bracket 62. In this embodiment, the eighth spring 65 is a torsion spring.

[0067] When the rear door limiting mechanism 60 is not in use, under the force of the eighth spring 65, the hook portion 642 of the button 64 hooks onto the other end of the buffer block bracket 62, keeping the buffer block bracket 62 and the buffer block 63 within the cavity. When the rear door limiting mechanism 60 needs to be used, the pressing portion 641 of the button 64 is pressed, causing the button 64 to rotate around the hinge. The hook portion 642 disengages from the other end of the buffer block bracket 62, releasing the buffer block bracket 62. Under the elastic force of the seventh spring, the buffer block 63 rotates out of the opening. The buffer block 63 can block the rear edge of the rearward sliding hatch 10, serving as a limiting and buffering function. When it is necessary to reset the rear door limiting mechanism 60, the buffer block bracket 62 and the buffer block 63 are pushed back into the cavity, and the hook portion 642 of the button 64 hooks onto the other end of the buffer block bracket 62 again.

[0068] In addition, the rear limit mechanism 60 of the hatch also includes a third limit post 66 and a fourth limit post 67, both of which are mounted on the housing 61 and are used to limit the rotational position of the buffer block bracket 62 and the button 64, respectively.

[0069] The role and effect of the embodiments

[0070] According to the helicopter sliding cabin door involved in this embodiment, its locking mechanism between the door and the door frame includes an upper lock box assembly, a lower lock box assembly, a connecting rod assembly, an upper lock seat assembly, a lower lock seat assembly, a hook assembly, and a hook limiting assembly. Because the upper lock box assembly, the upper lock seat assembly, and the lower lock box assembly and the lower lock seat assembly all use a hook-locking engagement to form locking points, this helicopter sliding cabin door is designed with two locking points, ensuring the stability of the door locking. The hook-locking engagement of the locking points requires less force during operation, making it very convenient. Because the upper and lower lock box assemblies are rigidly connected by a connecting rod assembly for transmission without travel difference, the upper and lower lock box assemblies move synchronously, and their movements are sensitive and reliable. Because the hook assembly and the hook limiting assembly limit each other, restricting the door from sliding forward, the door can remain in the open state, meeting the usage requirements.

[0071] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A helicopter sliding cabin door, comprising a door, an upper slide rail and a lower slide rail for sliding the door, a door frame that cooperates with the opening and closing of the door, and a locking mechanism for locking or unlocking the door and the door frame. Its features are: in, The upper edge of the hatch is provided with an upper roller that mates with the upper slide rail, and the lower edge is provided with a lower roller that mates with the lower slide rail. The axis of the upper roller is set along the vertical direction of the hatch. The axis of the lower roller is perpendicular to the vertical direction of the hatch. The locking mechanism includes: The lock box assembly includes a lock box mounted on the hatch and a lock hook hinged to the lock box; The lower lock box assembly includes a lower lock box mounted on the hatch, a lower lock hook hinged to the lower lock box, and an unlocking mechanism operated by a person to drive the lower lock hook to rotate; The linkage assembly is rigidly connected between the upper locking hook and the unlocking mechanism; The locking seat assembly includes a locking seat mounted on the door frame and a locking pin mounted on the locking seat, wherein the locking pin cooperates with the locking hook to lock or unlock; The lower lock seat assembly includes a lower lock seat mounted on the door frame and a lower lock pin mounted on the lower lock seat, wherein the lower lock pin cooperates with the lower lock hook to lock or unlock; A hook assembly is connected to the unlocking mechanism and is driven by the unlocking mechanism to perform a linkage action; and A hook-and-stop assembly is installed on the outer surface of the fuselage skin behind the hatch. It engages with the hook assembly as the hatch moves rearward to its current position, thus limiting the hatch's forward sliding. The hook assembly includes a first swing arm, a second swing arm, and a hook that are hinged together in sequence. The first swing arm is connected to the unlocking mechanism; The hook limiting assembly includes a swing arm seat mounted on the fuselage skin, a third swing arm hinged to the swing arm seat, a third spring disposed at the hinge of the third swing arm, and a second limiting post mounted on the swing arm seat. The third spring is used to provide the force to return the third swing arm to its original position. The third swing arm has an arc-shaped hole, and the second limiting post cooperates with the arc-shaped hole to limit the rotation range of the third swing arm. The third swing arm first rotates due to the impact of the rearward-moving hook, causing the hook to move to its rear, and then returns to its original position by the action of the third spring, restricting the forward movement of the hook.

2. The helicopter sliding cabin door according to claim 1, characterized in that: in, The unlocking mechanism includes an outer handle, a transmission cam, and an inner handle, all coaxially connected and hinged to the lower lock box. The transmission cam drives the lower locking hook to rotate under the action of the outer handle or the inner handle, and the transmission cam is connected to a second spring for providing a force to make it rotate and disengage from the lower locking hook.

3. The helicopter sliding cabin door according to claim 1, characterized in that: in, The lower locking hook is connected to a first spring for providing a force to rotate it and press it against the lower locking pin. The upper locking hook is connected to a fourth spring for providing a force to rotate it and press it against the upper locking post.

4. The helicopter sliding cabin door according to claim 1, characterized in that: in, The linkage assembly includes an upper linkage connected to the upper locking hook, a lower linkage connected to the unlocking mechanism, a pull rod connected between the upper linkage and the lower linkage, a spring bracket mounted on the door frame and through which the pull rod passes, and a fifth spring sleeved on the pull rod and abutting between the step surface of the pull rod and the spring bracket. The fifth spring is used to prevent jamming during transmission between the upper connecting rod, the pull rod, and the lower connecting rod.

5. The helicopter sliding cabin door according to claim 1, characterized in that: in, The lower lock seat assembly also includes a micro switch contact rod movably mounted on the lower lock seat, a micro switch with its contact point located on the movement path of the micro switch contact rod, a sixth spring sleeved on the micro switch contact rod and abutting between the stepped surface of the micro switch contact rod and the lower lock seat, and a prompting device electrically connected to the micro switch. The micro switch contact rod moves by being pushed by the lower locking hook that is hooked onto the lower locking pin. The sixth spring is used to provide the force to reset the micro switch contact rod.

6. The helicopter sliding cabin door according to claim 1, characterized in that: in, The front edge of the hatch is provided with a front baffle that cooperates with the door frame in the vertical direction of the hatch, and the lower edge of the hatch is provided with a lower baffle that cooperates with the lower slide rail in the vertical direction of the hatch.

7. The helicopter sliding cabin door according to any one of claims 1 to 6, characterized in that, Also includes: The rear limit mechanism of the hatch is installed on the inner side of the fuselage skin behind the hatch and is used to limit the rearward sliding position of the hatch.

8. The helicopter sliding cabin door according to claim 7, characterized in that: in, The rear door limiting mechanism includes a housing mounted on the fuselage skin with an opening in a recessed cavity, a buffer block bracket locked within the recessed cavity or released from the opening extending outwards, a buffer block mounted on the buffer block bracket, and a button for locking or releasing the buffer block bracket. The buffer block is used to block the rear edge of the hatch.

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