An astronaut seat backrest locking mechanism

Abstract

An astronaut seat backrest locking mechanism includes a support module and a locking module. The support module consists of a support assembly and a locking assembly; the locking module consists of a latch assembly, an unlocking handle assembly, and a pull-back handle assembly. The support assembly includes a support plate; the locking assembly includes a support module latch, a latch spring, etc.; the latch assembly includes a locking module latch, a set screw, a mounting base, etc.; the unlocking handle assembly includes a lock cover, an unlocking handle, an unlocking handle torsion spring, etc.; the pull-back handle assembly includes a limit rod, a pull-back handle, a lock housing, etc. The support plate does not occupy the seat's movement space and can be fixed to the side of the seat back when retracted. During operation, it can effectively balance the force on the angle adjuster and has no impact on seat operation. The locking module has a compact structure and is easy to operate. The left and right latches can be unlocked and retracted synchronously via a linkage, making operation simple. This invention is applicable to astronaut seats under complex mechanical conditions, assisting the angle adjuster in locking and protecting the seat back angle.

Description

Technical Field

[0001] This application belongs to the technical field of spacecraft seat backrest locking, and particularly relates to a backrest locking mechanism suitable for astronaut angle-adjustable seats. Background Technology

[0002] To ensure astronaut comfort and optimize cabin space, spacecraft seats require adjustable backrests. When astronauts are off the seat to perform missions, the seat can fold down to save space; when seated, it can be adjusted to a comfortable angle to ensure astronaut comfort and safety. Normally, the angle between the backrest and base of a spacecraft seat is adjusted and locked using an angle adjuster. However, due to the complex acceleration environment during launch or reentry of a manned spacecraft, the seat inevitably experiences severe vibrations. Excessive torque at the connection between the backrest and base can easily cause the angle adjuster to fail. If the angle adjuster fails, the seat back and base will be in a free-rotating state, potentially leading to collisions with other mechanisms and posing a direct threat to astronaut safety. Therefore, a backrest locking mechanism is needed to assist the angle adjuster in locking the backrest angle, ensuring the seat's safety and reliability.

[0003] A review of existing technologies reveals that aircraft seats primarily use hydraulic / pneumatic actuation to adjust the seat angle. Since aircraft seats are in a seated position, the primary load-bearing structure is the seat cushion, and the overload levels during normal flight and emergency landing are relatively small, the need for auxiliary locking mechanisms is minimal. Car seats, on the other hand, achieve angle adjustment and load-bearing capacity through an adjuster, generally without other auxiliary locking mechanisms. Summary of the Invention

[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide an astronaut seat backrest locking mechanism. When the angle adjuster is working normally, the backrest locking mechanism can provide an auxiliary locking function for the seat backrest, improve the force distribution of the angle adjuster, and make the seat have sufficient strength and reliability. When the angle adjuster locking function fails, the backrest locking mechanism can replace the angle adjuster in time to complete the angle locking task between the seat backrest and the base, so as to ensure the safety and reliability of the spacecraft seat.

[0005] The technical solution provided in this application is as follows:

[0006] An astronaut seat backrest locking mechanism is installed on the seat, which includes a seat and a backrest. The mechanism includes a support plate and a locking tongue assembly. One end of the support plate has a mounting hole that fits around the pivot of the adjuster and the backrest, allowing for rotatable connection. The other end of the support plate has a slot. The locking tongue assembly includes a locking module locking tongue, a set screw, a transmission rod, and a mounting base. The mounting base is fixedly installed on the bottom of the seat. A horizontal groove is provided on the side of the mounting base facing away from the seat. The locking module locking tongue is installed within and along the horizontal groove. The length direction of the rod is slidably connected to the mounting base, and the mounting base has a waist-shaped groove at one end of the horizontal slide groove; one end of the transmission rod is rotatably connected to the locking module's locking tongue through a set screw, and the other end extends into the waist-shaped groove. The transmission rod drives one end of the transmission rod to move along the length direction of the waist-shaped groove, and the transmission rod drives the locking module's locking tongue to move and extend or retract. When the locking module's locking tongue extends and engages in the slot, the seat and backrest are locked; two support plates are provided, and the two support plates are located on both sides of the backrest, and each support plate is provided with a corresponding locking tongue assembly.

[0007] The locking tongue assembly also includes a locking module locking tongue spring, which is sleeved on the outside of the transmission rod. One end of the locking module locking tongue spring contacts the locking module locking tongue, and the other end of the locking module locking tongue spring contacts the inner wall of the mounting base.

[0008] It also includes an unlocking handle assembly, where the locking module's latch has a groove on the surface away from the seat, and a set screw is located in the groove; when the locking module's latch is in the retracted state, the unlocking handle assembly engages in the groove.

[0009] The unlocking handle assembly includes a lock cover, an unlocking handle, an unlocking handle pin, and an unlocking handle torsion spring. The lock cover has a locking hole and is located on the side of the mounting base away from the seat, and is fixedly connected to the mounting base. The unlocking handle is rotatably connected to the lock cover through the unlocking handle pin. The unlocking handle torsion spring is sleeved on the unlocking handle pin, and both ends of the unlocking handle torsion spring contact the unlocking handle and the lock cover respectively, so that one end of the unlocking handle is engaged in the groove of the locking module's latch through the locking hole.

[0010] Two unlocking handle assemblies are provided, each of which cooperates with a locking tongue assembly, and the two unlocking handles are connected by a first link.

[0011] It also includes a pull-back handle assembly, which includes a limit rod, a lock housing, a pull-back handle, and a pull-back handle pin. The lock housing is fixedly installed at the bottom of the seat, and the pull-back handle is located inside the lock housing. The limit rod is installed at one end of the pull-back handle, and the pull-back handle pin is installed at the other end. The pull-back handle pin is connected to the end of the transmission rod located in the waist-shaped groove. The lock housing has a sliding groove through which the limit rod passes. The sliding groove is used to limit the movement of the limit rod.

[0012] Two pull-back handle assemblies are provided, each pull-back handle assembly cooperates with a locking tongue assembly, and the two pull-back handle pins are connected by a second connecting rod.

[0013] The limiting rod includes a base, a sleeve, a stepped shaft, a locking spring, and a sliding handle. The base is rotatably connected to the pull-back handle. One end of the base has a mounting groove, and the locking spring is located in the mounting groove. The stepped shaft includes a large-diameter section and a small-diameter section. The diameter of the large-diameter section is larger than the diameter of the small-diameter section. The end of the large-diameter section is located in the mounting groove and contacts one end of the locking spring. The small-diameter section is connected to the sliding handle. The outer side of the large-diameter section is provided with a stepped surface. The sleeve is connected to the outer side of the end of the base with the mounting groove, and the end of the sleeve is provided with an annular part. The annular part is located on the side of the stepped surface facing the sliding handle. The sliding groove includes a connected equal-width section and a circular hole. The diameter of the circular hole is larger than the width of the equal-width section. The diameter of the circular hole matches the diameter of the large-diameter section, and the width of the equal-width section matches the diameter of the small-diameter section.

[0014] It also includes a locking component. The support plate has a through hole in the middle position. The locking component is connected to the chair back. The locking component can be engaged with or disengaged from the through hole in the middle position to fix the support plate to one side of the chair back or to loosen the fixation of the support plate.

[0015] The locking assembly includes a support module latch, a support module latch spring, a support module latch housing, a support plate, and a support module latch end cap. The chair back has a through hole. The support plate is fixedly connected to the inner wall of the chair back. The support module latch housing is connected to the side of the support plate facing the center of the chair back. One end of the support module latch has a raised edge, and the other end is spherical. The spherical end of the support module latch passes through the support plate and the through hole, with the raised edge located on the side of the support plate facing the center of the chair back. The support module latch end cap is threaded to the end of the support module latch housing. One end of the support module latch spring contacts the support module latch, and the other end contacts the support module latch end cap. The end of the through hole in the middle position contacts the spherical surface.

[0016] In summary, this application includes at least the following beneficial technical effects:

[0017] This invention provides backrest locking support for spacecraft seats, meeting the operational needs of personnel and maintaining a predetermined angle between the seat back and base under heavy loads, demonstrating excellent safety and reliability. Firstly, the invention optimizes the structural design and installation layout, saving space. In the non-operating state, the support plate is retracted into the backrest plane of the spacecraft seat, and the support module's locking tongue limits its position. The locking module is installed on the lower surface of the spacecraft seat's base, with the locking tongue in the retracted state. In this state, because the support module is retracted into the backrest plane and the locking module is retracted into the back of the base, the operator can control the folding angle of the spacecraft seat using the angle adjuster, performing the folding operation according to predetermined requirements without interfering with seat operation, thus saving space. Secondly, the invention is simple to operate. The operator only needs to complete the activation operation in two steps: first, press the unlock handle to eject the locking module's locking tongue from the mounting base; second, move the support plate downwards to engage the locking module's locking tongue in the support plate hole, completing the auxiliary locking. Finally, the present invention contains multiple force amplification mechanisms, so that the operator only needs a small force to lock and unlock the angle between the backrest and the base of the spacecraft seat. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a support component and a locking component according to an embodiment of the present invention, wherein a is a schematic diagram of the support component, b is a schematic diagram of the locking component, and c is a cross-sectional view of the locking component.

[0020] Figure 3 This is a schematic diagram of the locking tongue assembly structure according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the unlocking handle assembly according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the pull-back handle assembly according to an embodiment of the present invention, wherein a is a schematic diagram of the pull-back handle assembly and b is a diagram of the engagement between the pull-back handle assembly and the locking tongue assembly.

[0023] Figure 6 This is a structural diagram of the limit rod.

[0024] The diagram shows the following symbols: 1. Support component; 2. Locking component; 3. Locking tongue component; 4. Unlocking handle component; 5. Pull-back handle component.

[0025] 1.1 Support plate;

[0026] 2.1 Support module latch; 2.2 Support module latch spring; 2.3 Support module latch housing; 2.4 Support module latch end cap;

[0027] 3.1 Locking module latch; 3.2 Set screw; 3.3 Locking module latch spring; 3.4 Transmission rod; 3.5 Mounting base;

[0028] 4.1 Locking cover; 4.2 Unlocking handle; 4.3 Unlocking handle shaft elastic retaining ring; 4.4 Unlocking handle pin; 4.5 Unlocking handle torsion spring;

[0029] 5.1 Limiting rod; 5.2 Lock housing; 5.3 Pull-back handle; 5.4 Elastic retaining ring for pull-back handle shaft; 5.5 Pull-back handle pin; 5.11 Base; 5.12 Sleeve; 5.13 Stepped shaft; 5.14 Locking spring; 5.15 Sliding handle;

[0030] 91. Chair back; 92. Chair seat. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0032] This application discloses an astronaut seat backrest locking mechanism, which is installed on the seat, such as... Figure 1 As shown, the system includes a support assembly 1, a locking assembly 2, a locking tongue assembly 3, an unlocking handle assembly 4, and a pull-back handle assembly 5. The seat includes a seat 92 and a backrest 91 that are rotatably connected. The support assembly 1 is distributed on both sides of the backrest and is coaxial with the seat adjuster. The locking tongue assembly 3 is installed under the seat base. In the working state, the locking module locking tongue 3.1 extends and locks with the support plate 1.1. In the non-working state, it retracts into the base. The unlocking handle assembly 4 is located under the seat base and is directly connected to the locking tongue assembly 3. It is used to unlock and lock the locking module locking tongue 3.1. The left and right locking tongue assemblies 3 are connected in series through a connecting rod. The pull-back handle assembly 5 is installed under the seat base and is directly connected to the locking tongue assembly 3. The left and right pull-back handle pins 5.5 are connected in series through a connecting rod to achieve a series control effect. Pulling one pull-back handle 5.1 will drive the other side to pull back synchronously.

[0033] like Figure 1 and Figure 2As shown in Figure a, the support assembly 1 includes a support plate 1.1. One end of the support plate 1.1 has a mounting hole that fits around the pivot of the seat adjuster and the backrest, allowing direct rotatable connection with the backrest. The other end of the support plate 1.1 serves as a locking end, with a slot for engaging with the locking tongue assembly 3 for locking and unlocking. In the retracted state, the through hole in the middle of the support plate 1.1 engages with the locking tongue 2.1 of the support module for locking. In the working state, pulling the support plate 1.1 downwards overcomes the spring force of the locking tongue spring 2.2 of the support module, engaging with the locking tongue 3.1 of the locking module for locking. In the non-working state, the support plate 1.1 is locked to the locking tongue of the support module on the backrest. In the working state, it is locked to the locking tongue of the locking module at the bottom of the base, assisting the seat adjuster mechanism in locking the seat back angle and improving the stress distribution on the seat.

[0034] like Figure 1 , Figure 2 As shown in Figures b and c, the locking assembly 2 includes a support module lock tongue 2.1, a support module lock tongue spring 2.2, a support module lock tongue housing 2.3, a support plate 2.5, and a support module lock tongue end cap 2.4. The locking assembly 2 is installed on both sides of the seat back. The chair back has a through hole. The support module latch shell 2.3 and the support plate 2.5 are integrally connected. The support plate 2.5 is fixed to the inner wall of the chair back with bolts. The support module latch shell 2.3 is located on the side of the support plate 2.5 facing the middle of the chair back. One end of the support module latch 2.1 has a raised edge. The support module latch 2.1 passes through the support plate 2.5, and the raised edge is located on the side of the support plate 2.5 facing the middle of the chair back, thus limiting the position of the support plate 2.5. The support module latch end cap 2.4 is threaded to the end of the support module latch shell 2.3. The support module latch spring 2.2 is located inside the support module latch 2.1, with one end of the spring contacting the inner wall of the support module latch 2.1 and the other end contacting the support module latch end cap 2.4, providing elasticity to keep the support module latch 2.1 in the extended state. The end of the support module latch 2.1 is spherical, and the spherical surface contacts the end of the through hole in the middle position on the support plate 1.1. When the support plate 1.1 is in the retracted state, the support module locking tongue 2.1 extends out of the through hole under the action of elastic force and locks with the through hole in the middle position of the support plate 1.1; when it is necessary to lock through the support plate 1.1, push the support plate 1.1. Since the support plate 1.1 and the end of the support module locking tongue 2.1 are in spherical contact, as the support plate 1.21 is pushed, the support module locking tongue 2.1 moves and disengages from the support plate 1.21.

[0035] like Figure 1 and Figure 3As shown, the main function of the locking tongue assembly is to ensure the smooth sliding of the locking tongue. The locking tongue assembly 3 includes a locking module locking tongue 3.1, a set screw 3.2, a locking module locking tongue spring 3.3, a transmission rod 3.4, and a mounting base 3.5. The mounting base 3.5 is fixedly installed on the back of the seat base by bolts to provide support. A horizontal groove is provided on the side of the mounting base 3.5 away from the seat. The locking module locking tongue 3.1 is installed in the horizontal groove and is slidably connected to the mounting base 3.5 along the length of the horizontal groove. The mounting base 3.5 is provided with a waist-shaped groove at one end of the horizontal groove. One end of the transmission rod 3.4 is rotatably connected to the locking module locking tongue 3.1 through the set screw 3.2, and the other end extends into the waist-shaped groove. It can be driven by the unlocking handle assembly 4 to move along the length of the waist-shaped groove, so that the transmission rod 3.4 pulls the locking module locking tongue 3.1 to reciprocate in the horizontal groove. The locking module latch 3.1 has a groove on the surface away from the seat. The set screw 3.2 is located in the groove and is engaged with the groove by the unlocking handle to lock the latch. In the working state, the locking module latch 3.1 extends and engages with the slot at the end of the support plate 1.1 to lock the seat back and base to a fixed angle. In the retracted state, the locking module latch 3.1 retracts into the mounting base 3.5, and the unlocking handle 4.2 engages with the groove of the locking module latch 3.1 to ensure that the locking module latch 3.1 is stably retracted into the mounting base 3.5. The locking module latch spring 3.3 is mounted on the transmission rod 3.4 and is installed between the mounting base and the locking module latch. It has a preload to provide elasticity for the locking module latch 3.1. The operator pulls the locking module latch 3.1 back to the retracted state using the transmission rod 3.4.

[0036] like Figure 1 , Figure 4 and Figure 5As shown in Figures a and b, the unlocking handle assembly 4 includes a lock cover 4.1, an unlocking handle 4.2, an elastic retaining ring 4.3 for the unlocking handle shaft, an unlocking handle pin 4.4, and an unlocking handle torsion spring 4.5. The lock cover 4.1 is mounted on the side of the mounting base 3.5 away from the seat and is fixedly connected to the mounting base 3.5 by bolts, providing fixed support for the normal operation of the locking module. The locking module's latch and the lock cover 4.1 form a sliding pair. The unlocking handle pin 4.4 is rotatably mounted on the side of the lock cover 4.1 away from the mounting base 3.5. The unlocking handle 4.2 is rotatably mounted on the side of the lock cover 4.1 away from the mounting base 3.5 via the unlocking handle pin 4.4. The elastic retaining ring 4.3 for the unlocking handle shaft is mounted on the unlocking handle pin 4.4 for axial positioning of the unlocking handle 4.2, enabling it to properly engage with the locking module's latch 3.1. The unlocking handle torsion spring 4.5 is mounted on the unlocking handle pin 4.4 to provide preload torque for the unlocking handle 4.2, ensuring that the unlocking handle remains in a pressed state. A locking hole is provided on the lock cover 4.1, and one end of the unlocking handle 4.2 is inserted into the groove of the locking module tongue 3.1 through the locking hole.

[0037] In the working state, the operator presses the unlocking handle 4.2, disengaging it from the groove of the locking module tongue 3.1. The locking module tongue 3.1 then extends and locks against the support plate 1.1, performing the locking task of the chair back locking mechanism. In the retracted state, the unlocking handle 4.2 engages with the upper groove of the locking module tongue 3.1, locking the position of the locking module tongue 3.1. The main function of the unlocking handle assembly is to cooperate with the locking module tongue in the tongue assembly, keeping the locking module tongue in the retracted state, and to extend the locking module tongue by operating the unlocking handle assembly.

[0038] like Figure 1 and Figure 5 As shown, the pull-back handle assembly 5 includes a limit rod 5.1, a lock housing 5.2, a pull-back handle 5.3, a spring retaining ring 5.4 for the pull-back handle shaft, and a pull-back handle pin 5.5. The lock housing 5.2 is bolted to the bottom of the chair seat and covers the outside of the lock cover 4.1. The lock housing 5.2 has clearance holes to allow the unlocking handle 4.2 to extend. The lock housing 5.2 has a weight reduction design (i.e., multiple weight reduction holes are provided).

[0039] The pull-back handle 5.3 is located inside the lock housing 5.2. The pull-back handle 5.3 has an opening in the middle, which cooperates with the mounting base to form a rotating pair. One end of the pull-back handle 5.3 is equipped with a limit rod 5.1, and the other end is equipped with a pull-back handle pin 5.5. The pull-back handle pin 5.5 is connected to the end of the transmission rod 3.4 located in the waist-shaped groove. The shaft of the limit rod 5.1 is interference-fitted with the pull-back handle 5.3. The limit rod 5.1 is installed in the sliding groove of the lock housing 5.2, and the sliding groove restricts the pull-back stroke of the limit rod 5.1. The locking module's latch 3.1 is retracted by pulling the pull-back handle 5.3 using the limit rod 5.1. The distance between the limit rod 5.1 and the opening of the pull-back handle 5.3 is greater than the distance between the transmission rod 3.4 and the opening of the pull-back handle 5.3. Utilizing the lever principle, the latch can be retracted with a smaller force, i.e., the locking module's latch 3.1 is pulled back to the retracted state through the force amplification principle. The pull-back handle shaft is mounted on the pull-back handle pin 5.5 with an elastic retaining ring 5.4 for axial positioning of the pull-back handle 5.3. The left and right pull-back handle pins 5.5 are connected by a connecting rod, enabling synchronous pull-back action.

[0040] like Figure 5 and Figure 6As shown, the lock housing 5.2 has a sliding groove through which the limiting rod 5.1 passes. The sliding groove is used to limit the movement of the limiting rod 5.1. The limiting rod 5.1 includes a base 5.11, a sleeve 5.12, a stepped shaft 5.13, a locking spring 5.14, and a sliding handle 5.15. The base is rotatably connected to the pull-back handle 5.3. One end of the base 5.11 has a mounting groove, and the locking spring 5.14 is located in the mounting groove. The stepped shaft 5.13 includes a large-diameter section and a small-diameter section. The diameter of the large-diameter section is larger than the diameter of the small-diameter section. The end of the large-diameter section is located in the mounting groove and contacts one end of the locking spring 5.14. The small-diameter section is connected to the sliding handle 5.15. The handle 5.15 is connected, and the outer side of the large-diameter section is provided with a stepped surface. The sleeve 5.12 is connected to the outer side of the end of the mounting groove of the base 5.11, and the end of the sleeve is provided with an annular part. The annular part is located on the side of the stepped surface facing the sliding handle 5.15. The sliding groove includes a connected equal-width section and a circular hole. The diameter of the circular hole is larger than the width of the equal-width section. The diameter of the circular hole matches the diameter of the large-diameter section. The width of the equal-width section is smaller than the diameter of the large-diameter section. The width of the equal-width section matches the diameter of the small-diameter section. When the limiting rod 5.1 is located in the equal-width section of the sliding groove, the small-diameter section mates with the equal-width section, and the locking spring 5.14 is in a compressed state. The limiting rod 5.1 can move along the sliding groove until the locking module latch 3.1 pops out and locks with the support plate 1.1. At this time, the limiting rod 5.1 moves into the round hole at the end of the equal-width section. At this time, the locking spring 5.14 pushes the limiting rod 5.1 upward, and the large-diameter section is inserted into the round hole. At this time, the limiting rod 5.1 can no longer move along the sliding groove, and the locking module latch 3.1 can stably maintain the locked state. When it is necessary to release the locked state of the locking module latch 3.1, simply press the sliding handle 5.15 towards the lock housing 5.2, so that the locking spring 5.14 is compressed and the large-diameter section is pushed out of the round hole. Then, moving the sliding handle 5.15 will release the locked state.

[0041] The limiting rod 5.1 is a stepped shaft structure with an internal spring. Only by pressing the limiting rod downwards can the thin shaft in the stepped shaft pass through the slot on the lock housing 5.2, allowing the limiting rod 5.1 to move relative to the lock housing 5.2. When the limiting rod 5.1 moves until the locking module's bolt 3.1 engages in the slot, the unlocking handle 4.2 fixes the limiting rod 5.1, ensuring the stability of its position and thus the stability of the locking state of the locking module's bolt 3.1.

[0042] A limit device is provided between the pull-back handle 5.3 and the lock housing 5.2 to prevent the pull-back handle 5.3 from moving relative to the lock housing 5.2 along a direction perpendicular to the axis of the limit rod 5.1.

[0043] The working principle and process of the astronaut seat back locking mechanism of the present invention are as follows:

[0044] Launch phase: After the angle adjuster is adjusted to the predetermined angle and locked, the operator pulls the backrest locking mechanism support plate 1.1 in advance and presses the unlocking handle 4.2 to pop out the locking module latch 3.1, so that one end of the support plate 1.1 cooperates with the locking module latch 3.1 to lock, and the backrest locking mechanism enters the working state, working together with the angle adjuster to ensure that the angle between the seat back and the base remains unchanged.

[0045] In-orbit phase: Unlocking can be completed in two steps. First, the operator pulls the limit lever 5.1, and the pull handle 5.3, through force amplification, pulls the locking module latch 3.1 back. When it is retracted to the fixed position, the front end of the unlocking handle 4.2 falls into the groove at the upper end of the latch under the action of the unlocking handle torsion spring 4.5, realizing the retraction and locking of the locking module latch 3.1. Second, the operator pulls the support plate 1.1 to retract it into the back of the spacecraft seat. The support module latch 2.1 falls into the hole in the support plate 1.1 by elastic force, entering the retracted state. At this time, both the support module and the locking module are in the retracted state, without interfering with the operator's seat adjustment and operation.

[0046] Return Phase: Upon returning, the operator can lock the locking module latch 3.1 and the support plate 1.1 through two actions. After adjusting the seat back to the predetermined position, the operator presses the unlocking handles 4.2 on both sides of the seat, causing the locking module latch 3.1 in the locking module to pop out. Then, the operator pulls the support plate 1.1 of the support module, overcoming the elastic force of the support module latch spring 2.2, and continues to rotate downwards, causing the locking module latch 3.1 to fall into the hole at one end of the support plate 1.1 and lock, entering the working state.

[0047] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0048] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. An astronaut seat backrest locking mechanism, installed on a seat, the seat comprising a seat (92) and a backrest (91), characterized in that: It includes a support plate (1.1) and a locking tongue assembly (3). One end of the support plate (1.1) is provided with a mounting hole, which is fitted around the rotating shaft of the angle adjuster and the backrest so as to be rotatably connected to the backrest (91). The other end of the support plate (1.1) is provided with a slot. The locking tongue assembly (3) includes a locking module locking tongue (3.1), a set screw (3.2), a transmission rod (3.4), and a mounting base (3.5). The mounting base (3.5) is fixedly installed at the bottom of the seat (92). A horizontal groove is provided on the side of the mounting base (3.5) away from the seat. The locking module locking tongue (3.1) is installed in the horizontal groove and is slidably connected to the mounting base (3.5) along the length of the horizontal groove. The mounting base (3.5) has a waist-shaped groove at one end of the horizontal groove. One end of the transmission rod (3.4) is rotatably connected to the locking module locking tongue (3.1) through the set screw (3.2), and the other end extends into the waist-shaped groove. The transmission rod (3.4) drives one end of the transmission rod (3.4) to move along the length of the waist-shaped groove. The transmission rod (3.4) drives the locking module locking tongue (3.1) to move and extend or retract. When the locking module locking tongue (3.1) extends and is engaged in the slot, the locking of the seat (92) and the backrest (91) is completed. Two support plates (1.1) are provided, and the two support plates (1.1) are located on both sides of the chair back respectively. Each support plate (1.1) is provided with a corresponding locking tongue assembly (3). It also includes a pull-back handle assembly (5), which includes a limit rod (5.1), a lock housing (5.2), a pull-back handle (5.3), and a pull-back handle pin (5.5). The lock housing (5.2) is fixedly installed at the bottom of the seat, and the pull-back handle (5.3) is located inside the lock housing (5.2). The limit rod (5.1) is installed at one end of the pull-back handle (5.3), and the pull-back handle pin (5.5) is installed at the other end. The pull-back handle pin (5.5) is connected to the end of the transmission rod (3.4) located in the waist-shaped groove. The lock housing (5.2) has a sliding groove, through which the limit rod (5.1) passes. The sliding groove is used to limit the movement of the limit rod (5.1).

2. The locking mechanism according to claim 1, characterized in that: The locking tongue assembly (3) also includes a locking module locking tongue spring (3.3), which is sleeved on the outside of the transmission rod (3.4). One end of the locking module locking tongue spring (3.3) contacts the locking module locking tongue (3.1), and the other end of the locking module locking tongue spring (3.3) contacts the inner wall of the mounting base (3.5).

3. The locking mechanism according to claim 1, characterized in that: It also includes an unlocking handle assembly (4), and the locking module tongue (3.1) has a groove on the surface away from the seat, and the set screw (3.2) is set in the groove; when the locking module tongue (3.1) is in the retracted state, the unlocking handle assembly (4) is engaged in the groove.

4. The locking mechanism according to claim 3, characterized in that: The unlocking handle assembly (4) includes a lock cover (4.1), an unlocking handle (4.2), an unlocking handle pin (4.4), and an unlocking handle torsion spring (4.5). The lock cover (4.1) has a locking hole. The lock cover (4.1) is placed on the side of the mounting base (3.5) away from the seat and is fixedly connected to the mounting base (3.5). The unlocking handle (4.2) is rotatably connected to the lock cover (4.1) through the unlocking handle pin (4.4). The unlocking handle torsion spring (4.5) is sleeved on the unlocking handle pin (4.4), and both ends of the unlocking handle torsion spring (4.5) are in contact with the unlocking handle (4.2) and the lock cover (4.1) respectively, so that one end of the unlocking handle (4.2) is inserted into the groove of the locking module tongue (3.1) through the locking hole.

5. The locking mechanism according to claim 4, characterized in that: Two unlocking handle assemblies (4) are provided, each unlocking handle assembly (4) cooperating with a locking tongue assembly (3), and the two unlocking handles (4.2) are connected by a first link.

6. The locking mechanism according to claim 1, characterized in that: Two pull-back handle assemblies (5) are provided, each pull-back handle assembly (5) cooperates with a locking tongue assembly (3), and the two pull-back handle pins (5.5) are connected by a second connecting rod.

7. The locking mechanism according to claim 1, characterized in that: The limiting rod (5.1) includes a base (5.11), a sleeve (5.12), a stepped shaft (5.13), a locking spring (5.14), and a sliding handle (5.15). The base is rotatably connected to the pull-back handle (5.15). One end of the base (5.11) has an installation groove, and the locking spring (5.14) is located in the installation groove. The stepped shaft (5.13) includes a large-diameter section and a small-diameter section. The diameter of the large-diameter section is larger than the diameter of the small-diameter section. The end of the large-diameter section is located in the installation groove and is connected to the locking spring (5.15). .14) One end is in contact with the sliding handle (5.15), the small diameter section is connected to the sliding handle (5.15), the outer side of the large diameter section is provided with a stepped surface, the sleeve (5.12) is connected to the outer side of the end of the mounting groove of the base (5.11), and the end of the sleeve is provided with an annular part, the annular part is located on the side of the stepped surface facing the sliding handle (5.15), the sliding groove includes a connected equal width section and a circular hole, the diameter of the circular hole is larger than the width of the equal width section, the diameter of the circular hole matches the diameter of the large diameter section, and the width of the equal width section matches the diameter of the small diameter section.

8. The locking mechanism according to claim 1, characterized in that: It also includes a locking component (2), a middle position through hole is provided on the support plate (1.1), the locking component (2) is connected to the backrest (91), the locking component (2) has a state of being engaged into the middle position through hole or disengaged from the middle position through hole, so as to fix the support plate (1.1) to one side of the backrest (91) or loosen the fixation of the support plate (1.1).

9. The locking mechanism according to claim 8, characterized in that: The locking assembly (2) includes a support module latch (2.1), a support module latch spring (2.2), a support module latch housing (2.3), a support plate (2.5), and a support module latch end cap (2.4). The chair back has a through hole. The support plate (2.5) is fixedly connected to the inner wall of the chair back. The support module latch housing (2.3) is connected to the side of the support plate (2.5) facing the middle of the chair back. One end of the support module latch (2.1) has a raised edge, and the other end... The end is spherical. The end of the support module lock tongue (2.1) is spherical and passes through the support plate (2.5) and the through hole. The protruding edge is located on the side of the support plate (2.5) facing the middle of the chair back. The end cap (2.4) of the support module lock tongue is threaded to the end of the support module lock tongue shell (2.3). One end of the support module lock tongue spring (2.2) is in contact with the support module lock tongue (2.1) and the other end is in contact with the end cap (2.4) of the support module lock tongue. The end of the through hole in the middle position is in contact with the spherical surface.

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