Astronaut seat back locking mechanism

Abstract

An astronaut seat back locking mechanism comprises a supporting module and a locking module, and the supporting module is composed of a supporting assembly and a locking assembly; the locking module is composed of a spring bolt assembly, an unlocking handle assembly and a pull-back handle assembly. The supporting assembly comprises a supporting plate; the locking assembly comprises a supporting module spring bolt, a spring bolt spring and the like. The spring bolt assembly comprises a locking module spring bolt, a jackscrew, a mounting seat and the like; the unlocking handle assembly comprises a lock cover, an unlocking handle, an unlocking handle torsion spring and the like; the pull-back handle assembly comprises a limiting rod, a pull-back handle, a lock shell and the like. The supporting plate does not occupy the movement space of the seat and can be fixed on the side surface of the seat back when retracted; during working, the stress of the angle adjuster can be well balanced, and the chair operation is not influenced; the locking module is compact in structure and convenient to operate. Unlocking and withdrawing of the left and right lock tongues can be synchronously controlled through the connecting rod, and operation is easy. The device is suitable for assisting an angle adjuster to lock and protect the angle of the chair back under the condition that mechanical conditions of an aerospace chair are complex.

Description

Technical Field

[0001] The present application belongs to the technical field of aerospace seat back locking, and particularly relates to a seat back locking mechanism suitable for astronaut angle-adjustable seats. Background Art

[0002] In order to ensure the comfort of astronauts and optimize the space in the cabin, the backrest of the aerospace seat needs to have an angle adjustment function. When the astronaut leaves the chair to perform a mission, the seat can be folded to save the space; when the astronaut is in the chair, the seat can be adjusted to a comfortable angle to ensure the comfort and safety of the astronaut. In general, the angle between the backrest and the base of the aerospace seat is adjusted and locked by a recliner. However, due to the complex acceleration environment during the launch or return of the manned spacecraft, the seat will inevitably vibrate violently, and the torque at the connection between the seat back and the base is too large, which may cause the recliner to fail. If the recliner fails, the angle between the seat back and the base will be in a free rotation state, which will cause the aerospace seat to collide with other mechanisms and pose a direct threat to the personal safety of the astronauts. Therefore, it is necessary to design a seat back locking mechanism for the seat to assist the recliner in auxiliary locking of the seat back angle to ensure the safety and reliability of the seat.

[0003] After searching the existing technologies, it is found that most aviation seats use hydraulic / pneumatic actuation to adjust the seat angle. Since aviation seats are in a sitting position, the main load is the cushion structure, and the overload level in normal flight and emergency landing conditions is relatively small, there is little demand for auxiliary locking. Car seats use recliners to achieve angle adjustment and load bearing, and generally have no other auxiliary locking mechanisms. Summary of the invention

[0004] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and to provide a seat back locking mechanism for an astronaut seat, wherein when the recliner is operating normally, the seat back locking mechanism can provide an auxiliary locking function for the seat back, thereby improving the stress condition of the recliner and providing the seat with sufficient strength and reliability; when the locking function of the recliner fails, the seat back locking mechanism can promptly replace the recliner to complete the task of locking the angle between the seat back and the base, thereby ensuring the safety and reliability of the aerospace seat.

[0005] The technical solutions provided by this application are as follows:

[0006] A locking mechanism for an astronaut seat backrest is installed on the seat. The seat includes a seat and a seat back, a support plate and a locking tongue assembly. A mounting hole is provided at one end of the support plate. The mounting hole is sleeved outside the rotating shaft of the recliner and the seat back so as to be rotatably connected with the seat back. A card slot is provided at the other end of the support plate. The locking tongue assembly includes a locking module locking tongue, a top screw, a transmission rod and a mounting seat. The mounting seat is fixedly installed at the bottom of the seat. A horizontal slide groove is provided on the side of the mounting seat away from the seat. The locking module locking tongue is installed in the horizontal slide groove and moves along the horizontal slide groove. The seat and the backrest are locked when the locking tongue of the seat is extended and inserted into the slot; two support plates are provided, and the two support plates are respectively located on both sides of the backrest, and each support plate is provided with a corresponding locking tongue assembly.

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

[0008] It also includes an unlocking handle assembly. A groove is provided on the surface of the locking module tongue away from the seat, and a top screw is arranged in the groove. When the locking module tongue is in a retracted state, the unlocking handle assembly is stuck 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. A locking hole is provided on the lock cover. The lock cover is arranged on the side of the mounting seat away from the seat and is fixedly connected to the mounting seat. The unlocking handle is rotatably connected to the lock cover through the unlocking handle pin. The unlocking handle torsion spring is sleeved outside the unlocking handle pin, and two ends of the unlocking handle torsion spring are respectively in contact with the unlocking handle and the lock cover, so that one end of the unlocking handle is inserted into the groove of the lock tongue of the locking module through the locking hole.

[0010] Two unlocking handle assemblies are provided, each unlocking handle assembly cooperates with a locking tongue assembly, and the two unlocking handles are connected via a first connecting rod.

[0011] It also includes a pull-back handle assembly, which includes a limit rod, a lock shell, a pull-back handle and a pull-back handle pin. The lock shell is fixedly installed on the bottom of the seat, and the pull-back handle is located inside the lock shell. 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 shell is provided with a sliding groove, and the limit rod passes through the sliding groove, and 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 via 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 pullback handle. A mounting groove is opened at one end of the base, 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. A stepped surface is provided on the outside of the large diameter section. The sleeve is connected to the outer side of the end of the mounting groove of the base, and an annular portion is provided on the end of the sleeve. The annular portion is located on the side of the step surface facing the sliding handle. The sliding groove includes connected equal-width sections and circular holes. The diameter of the circular hole is larger than the width of the equal-width sections. 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 assembly, a middle position through hole is opened on the support plate, the locking assembly is connected to the chair back, and the locking assembly can be stuck in the middle position through hole or disengaged from the middle position through hole to fix the support plate to one side of the chair back or loosen the fixation of the support plate.

[0015] The locking assembly includes a support module lock tongue, a support module lock tongue spring, a support module lock tongue shell, a support plate and a support module lock tongue end cover. The seat back is provided with a through hole. The support plate is fixedly connected to the inner wall of the seat back. The support module lock tongue shell is connected to the side of the support plate facing the middle of the seat back. One end of the support module lock tongue is provided with a convex edge on the outside and the other end is a spherical surface. The spherical end of the support module lock tongue passes through the support plate and the through hole, and the convex edge is located on the side of the support plate facing the middle of the seat back. The support module lock tongue end cover is threadedly connected to the end of the support module lock tongue shell. One end of the support module lock tongue spring is in contact with the support module lock tongue and the other end is in contact with the support module lock tongue end cover; the end of the through hole in the middle position is in contact with the spherical surface.

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

[0017] The present invention can lock and support the backrest of the aerospace seat, can meet the operating requirements of the operator, and can keep the predetermined angle between the backrest and the base unchanged under the condition of large load, and has good safety and reliability. First of all, the present invention has made optimization and improvement in structural design and installation layout, saving space. When the backrest locking mechanism is in a non-working state, the support plate is retracted into the plane of the backrest of the aerospace seat, and the support plate is limited by the support module lock tongue; the locking module is installed on the lower surface of the base of the aerospace seat, and the lock tongue is in a retracted state. In this state, since the support module is retracted into the plane of the backrest and the locking module is retracted into the back of the base, when the operator controls the folding and unfolding angle of the aerospace seat through the angle adjuster, the seat can be folded and unfolded according to the established requirements, and no interference will be caused to the seat operation, saving space. Secondly, the present invention is simple to operate, and the operator only needs to complete the activation operation in two steps: the first step is to press the unlocking handle so that the lock tongue of the locking module pops out from the mounting seat; the second step is to move the support plate downward so that the lock tongue of the locking module is stuck in the hole of the support plate to complete the auxiliary locking. Finally, there are a variety of force amplification mechanisms in the present invention, and the operator only needs a small amount of force to complete the locking and unlocking of the angle between the backrest and the base of the aerospace seat by the seat back locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the overall structure of an embodiment of the present invention.

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

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

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

[0022] Figure 5 It is a schematic diagram of the structure of a pullback handle assembly according to an embodiment of the present invention, wherein a is a schematic diagram of the structure of the pullback handle assembly, and b is a diagram of the coordination between the pullback handle assembly and the lock tongue assembly.

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

[0024] Description of the accompanying figures: 1. Support assembly; 2. Locking assembly; 3. Lock tongue assembly; 4. Unlocking handle assembly; 5. Pull-back handle assembly;

[0025] 1.1, support plate;

[0026] 2.1. Support module lock tongue; 2.2. Support module lock tongue spring; 2.3. Support module lock tongue housing; 2.4. Support module lock tongue end cover;

[0027] 3.1. Locking module tongue; 3.2. Top screw; 3.3. Locking module tongue spring; 3.4. Transmission rod; 3.5. Mounting seat;

[0028] 4.1. Lock cover; 4.2. Unlock handle; 4.3. Elastic retaining ring for unlock handle shaft; 4.4. Unlock handle pin; 4.5. Unlock handle torsion spring;

[0029] 5.1, limit 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 DESCRIPTION

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

[0032] The present application embodiment discloses a seat back locking mechanism for an astronaut seat, which is installed on the seat. Figure 1 As shown, it includes a support component 1, a locking component 2, a locking tongue component 3, an unlocking handle component 4, and a pulling back handle component 5; the seat includes a seat 92 and a seat back 91 that are rotatably connected, the support component 1 is distributed on both sides of the seat back and is coaxial with the seat recliner; the locking tongue component 3 is installed under the seat base, and the locking module locking tongue 3.1 is extended and locked with the support plate 1.1 in the working state, and is retracted into the base in the non-working state; the unlocking handle component 4 is located under the seat base and is directly connected to the locking tongue component 3, and is used to unlock and lock the locking module locking tongue 3.1, and the left and right side locking tongue components 3 are controlled in series through a connecting rod; the pulling back handle component 5 is installed under the seat base and is directly connected to the locking tongue component 3, and the left and right side pulling back handle pins 5.5 are connected through a connecting rod to achieve a series control effect, and pulling the pulling back handle 5.1 on one side 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 is provided with a mounting hole. The mounting hole is sleeved outside the rotating shaft of the recliner and the chair back so as to be directly rotatably connected with the chair back. The other end of the support plate 1.1 serves as a locking end and is provided with a slot for locking and unlocking in cooperation with the lock tongue assembly 3. In the retracted state, the through hole in the middle position of the support plate 1.1 is locked in cooperation with the support module lock tongue 2.1. In the working state, the support plate 1.1 is pulled downward to overcome the elastic force of the support module lock tongue spring 2.2 and locked in cooperation with the lock module lock tongue 3.1. In the non-working state, the support plate 1.1 is connected and locked with the support module lock tongue on the chair back. In the working state, it is locked with the lock module lock tongue at the bottom of the base, and the auxiliary recliner mechanism locks the seat back angle to improve the stress condition of 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 cover 2.4, and the locking assembly 2 is installed on both sides of the seat back. The backrest is provided with a through hole, the support module lock tongue shell 2.3 and the support plate 2.5 are connected as one body, the support plate 2.5 is fixedly connected to the inner wall of the backrest by bolts, the support module lock tongue shell 2.3 is located on the side of the support plate 2.5 facing the middle of the backrest, one end of the support module lock tongue 2.1 is provided with a convex edge on the outside, the support module lock tongue 2.1 passes through the support plate 2.5, and the convex edge is located on the side of the support plate 2.5 facing the middle of the backrest to limit the support plate 2.5, the support module lock tongue end cover 2.4 is threadedly connected to the end of the support module lock tongue shell 2.3, the support module lock tongue spring 2.2 is located in the support module lock tongue 2.1, and one end of the support module lock tongue spring 2.2 contacts the inner wall of the support module lock tongue 2.1, and the other end contacts the support module lock tongue end cover 2.4, providing elastic force for it so that the support module lock tongue 2.1 remains in the extended state. The end of the support module lock tongue 2.1 is a spherical surface, and the spherical surface contacts the end of the through hole at the middle position on the support plate 1.1. When the support plate 1.1 is in the retracted state, the support module lock tongue 2.1 extends out of the hole under the action of elastic force and locks with the through hole in the middle position of the support plate 1.1; when locking is required through the support plate 1.1, the support plate 1.1 is pushed. Due to the spherical contact between the support plate 1.1 and the end of the support module lock tongue 2.1, as the support plate 1.21 is pushed, the support module lock 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 lock tongue assembly is to ensure the smooth sliding of the lock tongue; the lock tongue assembly 3 includes a locking module lock tongue 3.1, a top screw 3.2, a locking module lock tongue spring 3.3, a transmission rod 3.4 and a mounting seat 3.5, and the mounting seat 3.5 is fixedly mounted on the back of the seat base by bolts to provide support; a horizontal slide groove is provided on the side of the mounting seat 3.5 away from the seat, and the locking module lock tongue 3.1 is installed in the horizontal slide groove and is slidably connected with the mounting seat 3.5 along the length direction of the horizontal slide groove, and the mounting seat 3.5 is provided with a waist-shaped groove at one end of the horizontal slide groove; one end of the transmission rod 3.4 is rotatably connected with the locking module lock tongue 3.1 through the top screw 3.2, and the other end extends into the waist-shaped groove, and can be driven by the unlocking handle assembly 4 to move along the length direction of the waist-shaped groove, so that the transmission rod 3.4 pulls the locking module lock tongue 3.1 to reciprocate in the horizontal slide groove. There is a groove on the surface of the locking module lock tongue 3.1 facing away from the seat, and the top screw 3.2 is arranged in the groove, and the unlocking handle cooperates with the groove to realize the locking of the lock tongue; when in the working state, the locking module lock tongue 3.1 extends out and is locked into the slot at the end of the support plate 1.1 to realize that the seat back and the base are locked to a fixed angle, and when in the retracted state, the locking module lock tongue 3.1 is retracted into the mounting seat 3.5, and the unlocking handle 4.2 cooperates with the groove of the locking module lock tongue 3.1 to ensure that the locking module lock tongue 3.1 is stably received in the mounting seat 3.5; the locking module lock tongue spring 3.3 is installed on the transmission rod 3.4, and the locking module lock tongue spring 3.3 is installed between the mounting seat and the locking module lock tongue, and there is a pre-tightening force for providing elastic force for the locking module lock tongue 3.1; the operator pulls back the locking module lock tongue 3.1 to the retracted state through 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 arranged on the side of the mounting seat 3.5 away from the seat, and is fixedly connected to the mounting seat 3.5 by bolts to provide fixed support for the normal operation of the locking module; the locking module lock tongue and the lock cover 4.1 form a moving pair. The unlocking handle pin 4.4 is rotatably installed on the side of the lock cover 4.1 away from the mounting seat 3.5, and the unlocking handle 4.2 is rotatably installed on the side of the lock cover 4.1 away from the mounting seat 3.5 through the unlocking handle pin 4.4. The unlocking handle shaft elastic retaining ring 4.3 is installed on the unlocking handle pin 4.4, which is used to axially position the unlocking handle 4.2 so that it can properly cooperate with the locking module lock tongue 3.1. The unlocking handle torsion spring 4.5 is installed on the unlocking handle pin 4.4, which is used to provide a pre-tightening torque for the unlocking handle 4.2, so that the unlocking handle is always kept in a compressed 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 tongue 3.1 of the locking module through the locking hole.

[0037] When in working state, the operator presses the unlocking handle 4.2 to disengage it from the groove of the locking module tongue 3.1, and the locking module tongue 3.1 pops out and locks with the support plate 1.1, performing the locking task of the seat back locking mechanism. When in retracted state, the unlocking handle 4.2 cooperates with the groove at the upper end of the locking module tongue 3.1, and the position of the locking module tongue 3.1 is locked. The main function of the unlocking handle assembly is to cooperate with the locking module tongue in the tongue assembly to keep the locking module tongue in the retracted state, and the locking module tongue can be extended 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 shell 5.2, a pull-back handle 5.3, an elastic retaining ring 5.4 for the pull-back handle shaft and a pull-back handle pin 5.5. The lock shell 5.2 is installed on the bottom of the seat by bolts, and the lock shell 5.2 cover is arranged on the outside of the lock cover 4.1. The lock shell 5.2 is provided with an avoidance hole to allow the unlocking handle 4.2 to extend out; the lock shell 5.2 is designed to reduce weight (i.e., multiple weight-reducing holes are provided).

[0039] The pull-back handle 5.3 is located inside the lock shell 5.2. A hole is opened in the middle of the pull-back handle 5.3, which cooperates with the mounting seat to form a rotating pair. A limit rod 5.1 is installed at one end of the pull-back handle 5.3, and a 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 axis of the limit rod 5.1 is interference fit with the pull-back handle 5.3; the limit rod 5.1 is installed in the sliding groove of the lock shell 5.2, and the sliding groove constrains the pull-back stroke of the limit rod 5.1. The locking module lock tongue 3.1 is retracted by pulling the pull-back handle 5.3 through the limit rod 5.1; the size of the opening of the limit rod 5.1 to the pull-back handle 5.3 is larger than the size of the opening of the transmission rod 3.4 to the pull-back handle 5.3. By utilizing the lever principle, the lock tongue can be retracted by a smaller force, that is, the locking module lock tongue 3.1 is retracted to the retracted state by the force amplification principle; the pull-back handle shaft is installed on the pull-back handle pin 5.5 with an elastic retaining ring 5.4 for axially positioning the pull-back handle 5.3; the pull-back handle pins 5.5 on the left and right sides are connected by a connecting rod to achieve a synchronous pull-back action.

[0040] like Figure 5 and Figure 6As shown, the lock housing 5.2 is provided with a sliding groove, and the limiting rod 5.1 passes through the sliding groove, and 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 is provided with 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 that 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 in contact with the sliding handle 5.15. The handle 5.15 is connected, a stepped surface is provided on the outside of the large diameter section, the sleeve 5.12 is connected to the outer side of the end of the mounting groove of the base 5.11, and an annular portion is provided on the end of the sleeve, the annular portion is located on the side of the stepped surface facing the sliding handle 5.15, the sliding groove includes interconnected equal width sections and circular holes, 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, and the width of the equal width section matches the diameter of the small diameter section. When the limit rod 5.1 is located in the equal width section of the sliding groove, the small diameter section cooperates with the equal width, the locking spring 5.14 is in a compressed state, and the limit rod 5.1 can move along the sliding groove until the locking module lock tongue 3.1 pops out and locks with the support plate 1.1, and the limit rod 5.1 moves into the circular hole at the end of the equal width section. At this time, the locking spring 5.14 pushes the limit rod 5.1 upward, and the large diameter section is stuck in the circular hole. At this time, the limit rod 5.1 cannot continue to move along the sliding groove, and the locking module lock tongue 3.1 can stably maintain the locked state. When the locking state of the locking module lock tongue 3.1 needs to be released, just press the sliding handle 5.15 in the direction close to the lock shell 5.2, so that the locking spring 5.14 is compressed, and the large diameter section is pushed out of the circular hole. At this time, move the sliding handle 5.15 to release the locked state.

[0041] The limit rod 5.1 is a stepped shaft structure with a spring inside. Only by pressing the limit rod downward can the thin shaft in the stepped shaft pass through the slot on the lock housing 5.2, so that the limit rod 5.1 can move relative to the lock housing 5.2. When the limit rod 5.1 moves to the locking module lock tongue 3.1 and is inserted into the slot, the limit rod 5.1 is fixed by the unlocking handle 4.2, which ensures the stability of the position of the limit rod 5.1 and further ensures the stability of the locking state of the locking module lock tongue 3.1.

[0042] A limiting device is provided between the pull-back handle 5.3 and the lock housing 5.2, so that the pull-back handle 5.3 will not move relative to the lock housing 5.2 along a direction perpendicular to the axis of the limiting rod 5.1.

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

[0044] Launching stage: After the recliner is adjusted to a predetermined angle, it remains locked. The operator pulls the seat back locking mechanism support plate 1.1 in advance and presses the unlocking handle 4.2 to pop out the locking module tongue 3.1, so that one end of the support plate 1.1 cooperates with the locking module tongue 3.1 to lock. The seat back locking mechanism enters the working state and cooperates with the recliner to ensure that the angle between the seat back and the base remains fixed.

[0045] On-orbit stage: The operator can complete the unlocking in two steps. First, the operator pulls the limit rod 5.1, and the pullback handle 5.3 pulls the locking module lock tongue 3.1 through the force amplification principle to retract it. When it is retracted to a fixed position, the front end of the unlocking handle 4.2 falls into the groove at the upper end of the lock tongue under the action of the unlocking handle torsion spring 4.5, thereby retracting and locking the locking module lock tongue 3.1. Second, the operator retracts the support plate 1.1 into the back of the aerospace chair by lifting the support plate 1.1, and the support module lock tongue 2.1 falls into the hole in the support plate 1.1 through elastic force and enters the retracted state. At this time, both the support module and the locking module are in the retracted state, and will not interfere with the operator's adjustment and operation of the chair.

[0046] Return stage: When about to return, the operator can complete the locking of the locking module tongue 3.1 and the support plate 1.1 through two actions. After the operator adjusts the seat back to the predetermined position, the operator presses the unlocking handles 4.2 on both sides of the seat to make the locking module tongue 3.1 in the locking module pop out; then, the operator pulls the support plate 1.1 of the support module, overcomes the elastic force of the support module tongue spring 2.2 and continues to rotate downward, so that the locking module tongue 3.1 falls into the hole at one end of the support plate 1.1 and locks, entering the working state.

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

[0048] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. An astronaut seat back locking mechanism, mounted on a seat, the seat comprising a seat (92) and a seat back (91), characterized in that: It comprises a support plate (1.1) and a locking tongue assembly (3), wherein one end of the support plate (1.1) is provided with a mounting hole, the mounting hole is sleeved outside the rotary shaft of the recliner and the chair back so as to be rotatably connected with the chair back (91), and the other end of the support plate (1.1) is provided with a card slot; The lock tongue assembly (3) comprises a lock tongue of a locking module (3.1), a top screw (3.2), a transmission rod (3.4) and a mounting seat (3.5); the mounting seat (3.5) is fixedly mounted on the bottom of the seat (92); a horizontal slide groove is provided on the side of the mounting seat (3.5) facing away from the seat; the lock tongue of the locking module (3.1) is mounted in the horizontal slide groove and is slidably connected with the mounting seat (3.5) along the length direction of the horizontal slide groove; a waist-shaped groove is provided at one end of the horizontal slide groove; one end of the transmission rod (3.4) is rotatably connected with the lock tongue of the locking module (3.1) through the top screw (3.2) and the other end extends into the waist-shaped groove; one end of the transmission rod (3.4) is driven to move along the length direction of the waist-shaped groove; the transmission rod (3.4) drives the lock tongue of the locking module (3.1) to move and extend or retract; when the lock tongue of the locking module (3.1) extends and is clamped in the clamping groove, the seat (92) and the chair back (91) are locked; Two support plates (1.1) are provided, and the two support plates (1.1) are respectively located on two sides of the chair back, and each support plate (1.1) is provided with a corresponding locking tongue assembly (3).

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

3. The locking mechanism according to claim 1, characterized in that: It also comprises an unlocking handle assembly (4), wherein a groove is provided on the surface of the locking module tongue (3.1) facing away from the seat, and the top screw (3.2) is arranged in the groove; when the locking module tongue (3.1) is in a retracted state, the unlocking handle assembly (4) is inserted into the groove.

4. The locking mechanism according to claim 3, characterized in that: The unlocking handle assembly (4) comprises a lock cover (4.1), an unlocking handle (4.2), an unlocking handle pin (4.4) and an unlocking handle torsion spring (4.5); a locking hole is provided on the lock cover (4.1); the lock cover (4.1) is arranged on the side of the mounting seat (3.5) away from the seat and is fixedly connected to the mounting seat (3.5); the unlocking handle (4.2) is rotatably connected to the lock cover (4.1) via the unlocking handle pin (4.4); the unlocking handle torsion spring (4.5) is sleeved outside the unlocking handle pin (4.4); and two ends of the unlocking handle torsion spring (4.5) are respectively in contact with the unlocking handle (4.2) and the lock cover (4.1), so that one end of the unlocking handle (4.2) is inserted into the groove of the locking tongue (3.1) of the locking module 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) cooperates with a locking tongue assembly (3), and the two unlocking handles (4.2) are connected via a first connecting rod.

6. The locking mechanism according to claim 1, characterized in that: The invention also comprises a pull-back handle assembly (5), which comprises a limit rod (5.1), a lock shell (5.2), a pull-back handle (5.3) and a pull-back handle pin (5.5); the lock shell (5.2) is fixedly mounted on the bottom of the seat, the pull-back handle (5.3) is located inside the lock shell (5.2), one end of the pull-back handle (5.3) is mounted with the limit rod (5.1), and the other end of the pull-back handle (5.5) is mounted with the 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 lock shell (5.2) is provided with a sliding groove, the limit rod (5.1) passes through the sliding groove, and the sliding groove is used to limit the movement of the limit rod (5.1).

7. The locking mechanism according to claim 6, 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 pin shafts (5.5) are connected via a second connecting rod.

8. The locking mechanism according to claim 6, characterized in that: The limiting rod (5.1) comprises 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); a mounting groove is formed at one end of the base (5.11); the locking spring (5.14) is located in the mounting groove; the stepped shaft (5.13) comprises 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 is connected to the locking spring (5.14). .14), the small diameter section is connected to the sliding handle (5.15), the large diameter section is provided with a stepped surface on the outside, the sleeve (5.12) is connected to the outside of the end of the base (5.11) with the mounting groove, and the end of the sleeve is provided with an annular portion, which 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.

9. The locking mechanism according to claim 1, characterized in that: It also includes a locking assembly (2), wherein a middle position through hole is provided on the support plate (1.1), the locking assembly (2) is connected to the chair back (91), and the locking assembly (2) can be engaged with 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 chair back (91) or release the fixation of the support plate (1.1).

10. The locking mechanism according to claim 9, characterized in that: The locking assembly (2) comprises a support module lock tongue (2.1), a support module lock tongue spring (2.2), a support module lock tongue shell (2.3), a support plate (2.5) and a support module lock tongue end cover (2.4); the backrest is provided with a through hole; the support plate (2.5) is fixedly connected to the inner wall of the backrest; the support module lock tongue shell (2.3) is connected to one side of the support plate (2.5) facing the middle of the backrest; one end of the support module lock tongue (2.1) is provided with a convex edge and the other end is provided with a protruding edge. The end of the support module lock tongue (2.1) is a spherical surface, the end of the spherical surface passes through the support plate (2.5) and the through hole, the convex edge is located on the side of the support plate (2.5) facing the middle of the chair back, the support module lock tongue end cover (2.4) is threadedly connected to the end of the support module lock tongue shell (2.3), one end of the support module lock tongue spring (2.2) contacts the support module lock tongue (2.1), and the other end contacts the support module lock tongue end cover (2.4); the end of the through hole in the middle position contacts the spherical surface.

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