Automatic bolt

Abstract

The automatic bolt comprises a mounting assembly with a first space inside, a latch bolt assembly comprising a main body part and a latch bolt part, and a bolt rod penetrating through the mounting assembly and the latch bolt assembly, the automatic bolt has an unlocking state and a locking state, when the automatic bolt is in the unlocking state, a bolt head of the bolt rod is arranged in the latch bolt part, and when the automatic bolt is in the locking state, the bolt head of the bolt rod is arranged in the latch bolt part. A bolt head of the bolt rod extends out of the latch bolt part; during use, the automatic bolt is mounted at the top or the bottom of an auxiliary door leaf, and the bolt head is inserted into a lock hole of a door frame in a locked state; in the unlocking state, the bolt head is arranged in the latch bolt part instead of being exposed outside as in the prior art, and scratching between the bolt head and a door frame or a bottom sill is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of latch, in particular to an automatic latch. BACKGROUND

[0002] With the progress of social technology, armored door as an upgrade product of security door has entered more and more families. There are various structures of armored doors in the market, and hardware products are also emerging in an endless stream.

[0003] With the diversification of armored door styles and locks, a stable performance automatic latch is needed to meet market demand. The common automatic latch head on the market is a latch tongue type, similar to the latch tongue on the main lock body. This type of latch head is always extended outside the door. Only when the latch body is pressed down, the latch tongue will be retracted, and then the secondary door leaf is opened. When the handle is reset, the latch head is extended again. When the door is closed, the latch head will always scratch the door frame and the bottom sill until the latch tongue is completely inserted into the hole of the upper and lower frame. At this time, the secondary door leaf is locked. However, the disadvantage of this type of latch is that the latch head does not have a self-locking function, that is, the latch head is always extended under the action of the spring, which will scratch the upper and lower frames. SUMMARY

[0004] In view of the above defects or deficiencies in the prior art, the present application aims to provide an automatic latch arranged at the top and / or bottom of the secondary door leaf for cooperating with the lock hole on the door frame to realize the opening or closing of the secondary door leaf, comprising:

[0005] A mounting assembly having a first space therein, and first and second openings respectively arranged at two ends of the first space in a first direction;

[0006] A latch tongue assembly having a first through hole penetrating the middle portion thereof, the first through hole extending in the first direction, and the latch tongue assembly comprising a main body portion and a latch tongue portion;

[0007] A latch rod penetrating the first and second openings and the first through hole, and having a latch head at an end away from the first opening;

[0008] The automatic latch has an unlocking state and a locking state. When in the unlocking state, the main body portion is arranged in the first space, the latch tongue portion is exposed outside the mounting assembly, the latch head is arranged in the latch tongue portion exposed outside the mounting assembly, and the secondary door leaf is in an open state. When in the locking state, the main body portion and the latch tongue portion are both arranged in the first space, the latch head is extended from the latch tongue portion and inserted into the lock hole, and the secondary door leaf is in a closed state.

[0009] A driving assembly for driving the automatic bolt to switch between the unlocking state and the locking state.

[0010] According to the technical scheme provided in the embodiment of the application, the middle outer wall of the bolt rod placed in the first space is provided with external threads, the first space is further provided with a limiting plate, the limiting plate is placed close to the first opening side of the latch assembly, and the limiting plate is sleeved on the outer wall of the bolt rod.

[0011] According to the technical scheme provided in the embodiment of the application, the first space is further provided with a first elastic assembly, the first elastic assembly is sleeved on the outer wall of the bolt rod, is placed close to the first opening side of the limiting plate, and abuts against the limiting plate away from the first opening end and abuts against the inner wall of the mounting assembly.

[0012] According to the technical scheme provided in the embodiment of the application, the side wall of the mounting assembly opposite to the side wall provided with the first limiting opening is provided with a second limiting opening, the extension direction of the second limiting opening is the first direction, and the length of the second limiting opening is greater than that of the first limiting opening.

[0013] According to the technical scheme provided in the embodiment of the application, the side wall of the main body part is cut to form a blocking part, and the blocking part is used to prevent the latch assembly from being pulled out of the first space when the automatic bolt is in the unlocking state.

[0014] According to the technical scheme provided in the embodiment of the application, the latch part is provided with an extension part, and the extension part is used to increase the contact area with the door frame.

[0015] According to the technical scheme provided in the embodiment of the present application, the side wall of the mounting assembly is further provided with a third limiting opening, the third limiting opening and the second limiting opening intersect to form a cross opening, and the cross opening is used for placing the limiting plate into the first space.

[0016] According to the technical scheme provided in the embodiment of the present application, the driving assembly comprises a central control bolt lock body arranged outside the mounting assembly and close to the first opening, the central control bolt lock body comprises a mounting plate fixed in the auxiliary door frame, the mounting plate is slidably connected with a first push rod and a second push rod, the sliding direction is the first direction, the first push rod is connected with the bolt rod away from the second opening end, the second push rod is connected with a second elastic assembly close to the mounting assembly end, and the first push rod and the second push rod are connected through a connecting rod structure, when the automatic bolt is in the unlocking state, the first push rod is placed away from the mounting assembly end, the second push rod is placed close to the mounting assembly end, and the second elastic assembly is in an energy storage state; when the automatic bolt is in the locking state, the first push rod is placed close to the mounting assembly end, the second push rod is placed away from the mounting assembly end, and the second elastic assembly is in an energy release state.

[0017] According to the technical scheme provided in the embodiment of the present application, the connecting rod structure comprises a first connecting rod rotatably connected with the mounting plate, the axis extension direction of the rotating shaft of the first connecting rod is a second direction, the second direction is perpendicular to the first direction, and the two ends of the first connecting rod are respectively hinged with the first push rod away from the mounting assembly end and the second push rod close to the mounting assembly end, the axis extension direction of the hinge shaft is the second direction.

[0018] According to the technical scheme provided in the embodiment of the present application, the second push rod is hingedly connected with a second connecting rod away from the mounting assembly end, the second connecting rod is hingedly connected with a manual wrench away from the second push rod end, and the axis extension direction of the hinge shaft is the second direction.

[0019] In summary, the present application provides an automatic bolt, which comprises a mounting assembly with a first space inside, a latch assembly comprising a main body and a latch, and a bolt rod penetrating through the mounting assembly and the latch assembly. The automatic bolt has an unlocking state and a locking state. When in the unlocking state, the bolt head of the bolt rod is placed in the latch, and when in the locking state, the bolt head of the bolt rod is extended from the latch. In use, the automatic bolt is installed at the top or bottom of an auxiliary door leaf. When in the locking state, the bolt head is inserted into the lock hole of the door frame. In the unlocking state, the bolt head is placed in the latch, unlike the prior art, which is exposed and avoids scratching the door frame or the bottom sill. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1The structure schematic diagram of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0021] Figure 2 The cross-sectional view of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0022] Figure 3 The structure schematic diagram of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0023] Figure 4 The cross-sectional view of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0024] Figure 5 The structure schematic diagram of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0025] Figure 6 The structure schematic diagram of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0026] Figure 7 The structure schematic diagram of the automatic bolt without the central control bolt lock body in the unlocking state is provided for the embodiment of the application.

[0027] The text annotations in the figure represent:

[0028] 1, mounting assembly; 11, fixed plate; 12, first limiting port; 13, second limiting port; 14, third limiting opening; 2, latch assembly; 21, main body; 211, blocking part; 22, latch part; 221, inclined surface; 222, extension part; 3, bolt rod; 31, bolt head; 32, external thread; 4, limiting plate; 41, first limiting block; 42, second limiting block; 5, first elastic assembly; 6, mounting plate; 61, first push rod; 62, second push rod; 7, second elastic assembly; 63, U-shaped support; 64, first support rod; 81, first connecting rod; 82, second connecting rod; 83, second connecting rod; 821, first contact surface; 9, manual wrench; 91, second contact surface; DETAILED DESCRIPTION

[0029] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation on the application. In addition, it should be noted that, in order to facilitate description, only the parts related to the application are shown in the drawings.

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] As mentioned in the background art, the present application proposes an automatic bolt arranged at the top and / or bottom of the secondary door leaf, used in cooperation with the lock hole on the door frame to realize the opening or closing of the secondary door leaf, as shown in the drawings. Figures 1-7 As shown in the drawings, the automatic bolt comprises:

[0032] The mounting assembly 1 has a first space therein, and the two ends of the first space in the first direction are respectively provided with a first opening and a second opening;

[0033] The top surface or the bottom surface of the secondary door frame is inwardly provided with a mounting groove, and the automatic bolt is arranged in the mounting groove; the first direction is a vertical direction; the opening of the mounting assembly 1 away from the door frame is the first opening, and the opening close to the door frame is the second opening; the mounting assembly is provided with a fixed plate 11 on the side close to the door frame, the second opening is provided on the fixed plate 11, and the fixed plate 11 is fixed to the circumference of the slot opening of the mounting groove, i.e. mounted on the top surface and / or the bottom surface of the secondary door leaf.

[0034] The latch assembly 2 is provided with a first through hole in the middle portion, and the extension direction of the first through hole is the first direction; the latch assembly 2 comprises a main body portion 21 and a latch portion 22; wherein the latch portion 22 has an inclined surface 221 on the side close to the door frame;

[0035] The bolt rod 3 penetrates through the first opening, the second opening and the first through hole, and the bolt rod 3 has a bolt head 31 at the end away from the first opening; wherein the end of the bolt head 31 close to the door frame is a spherical surface.

[0036] The automatic bolt has an unlocking state and a locking state; when in the unlocking state, the main body portion 21 is placed in the first space, the latch portion 22 is exposed outside the mounting assembly 1, and the bolt head 31 is placed in the latch portion 22 exposed outside the mounting assembly 1, and the secondary door leaf is in an open door state; when in the locking state, the main body portion 21 and the latch portion 22 are placed in the first space, and the bolt head 31 is extended from the latch portion 22 and inserted into the lock hole, and the secondary door leaf is in a closed door state;

[0037] The driving assembly is used to drive the automatic bolt to switch between the unlocking state and the locking state; in use, the secondary door leaf is manually pushed to close, and during the closing process of the secondary door leaf, the inclined surface 221 of the latch portion 22 first contacts the door frame, and when the door frame moves relatively on the inclined surface 221, an action force in the vertical direction is generated on the inclined surface 221 to drive the latch assembly 2 to move into the first space, until the automatic bolt is switched from the unlocking state to the locking state, the latch portion 22 is entirely placed in the first space under the abutment of the door frame on the circumferential outer side of the lock hole, and the bolt head 31 is inserted into the lock hole.

[0038] The automatic bolt of the present application is in the unlocked state, i.e. the secondary door leaf is in the open state, the bolt head 31 is placed in the latch part 22, avoiding the exposure of the bolt head 31 to scratch the door frame.

[0039] In a preferred embodiment, the outer wall of the middle part of the bolt rod 3 placed in the first space is provided with external threads 32, and the first space is further provided with a limiting plate 4, which is placed close to the first opening side of the latch assembly 2 and is sleeved on the bolt rod 3. The side wall of the mounting assembly 1 is provided with a first limiting opening 12 which communicates with the first space, and the extending direction of the first limiting opening 12 is the first direction. The outer wall of the bolt rod 3 is provided with a first limiting block 41 corresponding to the first limiting opening 12, and the first limiting block 41 can slide in the first limiting opening 12. When the automatic bolt is in the unlocked state, the limiting plate 4 is placed at the bolt rod 3 with external threads 32, the included angle between the extension of the extending direction of the limiting plate 4 and the extension of the axis of the bolt rod 3 is not equal to 90°, and the first limiting block 41 abuts against the side wall of the first limiting opening 12 close to the second opening end. When the automatic bolt is in the locked state, the limiting plate 4 is placed close to the first opening side and is separated from the external threads 32 of the bolt rod 3, and the extension of the extending direction of the limiting plate 4 is perpendicular to the extension of the axis of the bolt rod 3.

[0040] In the preferred embodiment, the inner diameter of the through hole in the middle part of the limiting plate 4 is greater than the outer diameter of the bolt rod 3, the first limiting opening 12 is placed away from the second opening side, the length of the first limiting opening 12 is relatively short, which is used to limit the stroke of the first limiting block 41, and the limit position of the first limiting block 41 is the side wall of the first limiting opening 12 close to the second opening end, while the opposite side of the limiting plate 4 to the first limiting block 41 has no stroke limiting, so that the limiting plate 4 is inclined, and the inner ring is clamped in the adjacent two teeth of the external threads 21, so that the bolt rod 3 is locked under the limiting action of the first limiting opening 12, avoiding the extension of the bolt head 31.

[0041] When in the locked state, the vertical force is applied to the latch assembly 2 under the action of the door frame, which moves the limiting plate 4 away from the second opening, and since the end of the latch assembly 2 close to the limiting plate 4 is a plane, the limiting plate 4 is placed in a horizontal state during the movement of the limiting plate 4 away from the second opening, which releases the obstruction to the external threads 32, and the bolt rod 3 can move in the first direction in the through hole of the limiting plate 4.

[0042] In a preferred embodiment, the first space is further provided with a first elastic assembly 5, which is sleeved on the bolt rod 3 and is placed close to the first opening side of the limiting plate 4. The end of the first elastic assembly 5 away from the first opening end abuts against the limiting plate 4, and the other end abuts against the inner wall of the mounting assembly 1.

[0043] When the automatic bolt is in the unlocking state, the first elastic component 5 is in the compressed state, and a vertical elastic force is generated on the limiting plate 4, which makes the first limiting block 41 move to the end side wall along the first limiting opening 12, and the limiting plate 4 is inclined under the limiting of the first limiting opening 12.

[0044] In a preferred embodiment, the side wall of the mounting assembly 1 opposite to the side wall with the first limiting opening 12 is provided with a second limiting opening 13, the extension direction of the second limiting opening 13 is the first direction, and the length of the second limiting opening 13 is greater than that of the first limiting opening 12; the limiting plate 4 is provided with a second limiting block 42 on the outer wall corresponding to the second limiting opening 13, the second limiting block 42 can move in the second limiting opening 13, and the second limiting block 42 is used to prevent the limiting plate 4 from rotating on the bolt rod 3.

[0045] The first limiting opening 12 and the second limiting opening 13 avoid the rotation of the first limiting block 41 and the second limiting block 42, and improve the stability of the movement of the limiting block 4.

[0046] In a preferred embodiment, the side wall of the main body part 21 is cut to form a blocking part 211, which is used to prevent the latch assembly 2 from falling out of the first space when the automatic bolt is in the unlocking state.

[0047] The blocking part 211 is fixed at one end of the main body part 21 and is a free end at the other end, and slightly deviates from the first space side, so that when the automatic bolt is in the unlocking state, the free end abuts against the fixed plate 11, thereby avoiding the falling of the latch assembly 2 from the first space.

[0048] In a preferred embodiment, the latch part 22 is provided with an extension part 222, which is used to increase the contact area with the door frame.

[0049] The two ends of the latch part 22 away from the mounting assembly 1 extend outward to form the extension part 222, the shape of the extension part 222 is not limited, and the second opening on the fixed plate 11 corresponds to the projection of the latch part 22 and the extension part 222 on the fixed plate 11.

[0050] In a preferred embodiment, the side wall of the mounting assembly 1 is also provided with a third limiting opening 14, the third limiting opening 14 and the second limiting opening 13 form a cross opening, and the cross opening is used to put the limiting plate 4 into the first space.

[0051] The extension line of the connecting line between the first limiting block 41 and the second limiting block 42 of the limiting plate 4 is parallel to the extension direction of the third limiting opening 14, the limiting plate 4 is placed in the third limiting opening 14 and installed into the first space, the second limiting block 42 moves along the second limiting opening 13 until the first limiting block 41 extends out of the first limiting opening 12.

[0052] In a preferred embodiment, the driving assembly comprises a middle control bolt lock body arranged outside the mounting assembly 1 and close to the first opening, the middle control bolt lock body comprises a mounting plate 6 fixed in the sub-door frame, a first push rod 61 and a second push rod 62 are slidably connected on the mounting plate 6, the sliding direction is the first direction, the first push rod 61 is connected with the bolt rod 3 away from the second opening end, the second push rod 62 is connected with the second elastic assembly 7 close to the mounting assembly 1 end, and the first push rod 61 and the second push rod 62 are connected through a connecting rod structure, when the automatic bolt is in the unlocking state, the first push rod 61 is placed away from the mounting assembly 1 end, the second push rod 62 is placed close to the mounting assembly 1 end, and the second elastic assembly 7 is in the energy storage state; when the automatic bolt is in the locking state, the first push rod 61 is placed close to the mounting assembly 1 end, the second push rod 62 is placed away from the mounting assembly 1 end, and the second elastic assembly 7 is in the energy release state.

[0053] Specifically, the end of the mounting plate 6 close to the mounting assembly 1 is provided with a U-shaped bracket 63, the U-shaped bracket 63 has a second through hole close to the end of the second push rod 62, a first branch rod 64 penetrates through the second through hole and is connected with the second push rod 62 at the other end; optionally, the second elastic assembly 7 is a spring, the second elastic assembly 7 is arranged between the U-shaped bracket 63 and the second push rod 62 and is sleeved on the first branch rod 64; when the automatic bolt is switched from the locking state to the unlocking state, the bolt rod 3 moves along the first direction to the end close to the hollow bolt lock body, pushes the first push rod 61 to move along the first direction to the end away from the mounting assembly 1, under the action of the connecting rod structure, pushes the second push rod 62 to move to the end close to the mounting assembly 1, so as to compress the second elastic assembly 7, make the second elastic assembly 7 in the energy storage state, and drive the first branch rod 64 to move to the end close to the mounting assembly 1 until abuts against the end of the U-shaped bracket 63 away from the second push rod 62; when the automatic bolt is switched from the unlocking state to the locking state, the limiting plate 4 is unlocked to the bolt rod 3 under the action of the latch assembly 2, the second elastic assembly 7 releases the elasticity, drives the second push rod 62 to move the first branch rod 64 to the end away from the mounting assembly 1, pushes the first push rod 61 to move the bolt rod 3 to the end close to the door frame through the connecting rod structure, so that the bolt head 31 extends and is inserted into the lock hole.

[0054] Further, the first push rod 61 is provided with two first limiting rods distributed along the first direction, the second push rod 62 is provided with two second limiting rods distributed along the first direction, the mounting plate is provided with two first sliding grooves corresponding to the two first limiting rods respectively, and is provided with two second sliding grooves corresponding to the two second limiting rods respectively, when the automatic bolt is in the unlocking state, the two first limiting rods are in abutment with the inner wall of the first sliding groove away from the end of the mounting assembly 1, and the two second limiting rods are in abutment with the inner wall of the second sliding groove close to the end of the mounting assembly 1; when the automatic bolt is in the locking state, the two first limiting rods are in abutment with the inner wall of the first sliding groove close to the end of the mounting assembly 1, and the two second limiting rods are in abutment with the inner wall of the second sliding groove away from the end of the mounting assembly 1; the first sliding groove and the second sliding groove are used for limiting the displacement of the displacement of the bolt rod 3 along the first direction, which can be set at the corresponding position according to the actual requirement, and the length thereof can be set as required.

[0055] In a preferred embodiment, the connecting rod structure comprises a first connecting rod 81 rotatably connected with the mounting plate 6, an axis direction of an axis of rotation of the first connecting rod 81 is the second direction, the second direction is perpendicular to the first direction, and two ends of the first connecting rod 81 are hingedly connected with the first push rod 61 away from the end of the mounting assembly 1 and the second push rod 62 close to the end of the mounting assembly 1 respectively, an axis direction of an axis of the hinge shaft is the second direction.

[0056] In a preferred embodiment, the connecting rod structure comprises a first connecting rod 81 rotatably connected with the mounting plate 6, an axis direction of an axis of rotation of the first connecting rod 81 is the second direction, the second direction is perpendicular to the first direction, and two ends of the first connecting rod 81 are hingedly connected with the first push rod 61 away from the end of the mounting assembly 1 and the second push rod 62 close to the end of the mounting assembly 1 respectively, an axis direction of an axis of the hinge shaft is the second direction.

[0057] In a preferred embodiment, the second push rod 62 is hingedly connected with a second connecting rod 82 away from the end of the mounting assembly 1, the second connecting rod 82 is hingedly connected with the manual wrench 9 away from the end of the second push rod 62, and an axis direction of an axis of the hinge shaft is the second direction.

[0058] The second connecting rod 82 comprises a second branch rod hinged with the second push rod 62 and a third branch rod connected with the second branch rod, the third branch rod is hinged with the manual wrench 9, and the top end of the second branch rod away from the second push rod has a first contact surface 821; the manual wrench 9 has a hinge part hinged with the third branch rod, the hinge shaft is arranged in the middle part of the hinge part, the hinge part has a second contact surface 91 close to the end of the second branch rod, and the automatic bolt further comprises an intermediate state between the unlocking state and the locking state, at this time, the bolt rod 3 is pulled into the first space by the manual wrench 9, and the latch assembly 2 is also arranged in the first space under the abutting action of the door frame, and the limiting plate 4 is at the bolt rod 3 without external threads under the action force of the latch assembly 2; when the automatic bolt is in the unlocking state and the locking state, the manual wrench 9 is in the vertical direction, when the automatic bolt is switched from the locking state to the unlocking state, the second contact surface 91 of the manual wrench 9 is driven to move away from the end of the manual wrench 9 to the end close to the mounting assembly 1, the first push rod 61 is driven to move away from the end of the mounting assembly 1 through the first connecting rod 81, and then the bolt rod 3 is pulled out of the lock hole and enters the latch part 33.

[0059] The hinge part is further hinged with a third connecting rod, the third connecting rod is hinged with a fourth connecting rod away from the end of the hinge part, and the fourth connecting rod is sleeved outside the first rotating shaft, so that the stability of rotating the manual wrench 9 can be improved through the third connecting rod and the fourth connecting rod.

[0060] In the closed state of the sub-door leaf, the latch assembly 2 is arranged in the first space, and there is no gap between the latch assembly 2 and the door frame, so that the locking is more firm, the movement of the bolt head 31 is controlled through the central control bolt lock body structure, compared with the existing technology through the soft connection of the steel wire rope, the bolt head 31 is more firm and cannot be retracted or cannot be completely retracted.

[0061] In summary, the working principle of the application is as follows:

[0062] When the initial state is that the secondary door leaf is opened, the automatic bolt is in the unlocking state, the secondary door leaf door frame pushes the door frame, the door frame acts on the latch assembly 2, drives the latch assembly 2 to drive the limiting plate 4 to move away from the second opening end, so that the limiting plate 4 is separated from the external thread 32 on the bolt rod 3, the second elastic assembly 7 releases the elastic force, drives the first push rod 61 to drive the bolt head 31 to insert into the lock hole on the door frame, the secondary door leaf is closed and the automatic bolt is in the locking state; manually pull the manual wrench 9, the second connecting rod 82 pushes the second push rod 62 to compress the second elastic assembly 7, and the first push rod 61 is pulled away from the second opening end through the first connecting rod 82, until the bolt rod 3 is completely placed in the first space, at this time, the automatic bolt is in the intermediate state; pull the manual wrench 9 to open the secondary door leaf, the latch assembly 2 is separated from the restriction of the door frame, the latch part 22 is popped out of the first space through the first elastic assembly 5, and the limiting plate 4 is moved to the second opening end; when the user releases the manual wrench 9, the manual wrench 9 is released, the second elastic assembly 7 releases the elastic force, and the bolt rod 3 is pushed away from the first opening through the connecting rod structure, until it is fixed through the limiting plate 4, realizing the locking of the bolt rod 3, the secondary door leaf returns to the open state, and the automatic bolt returns to the unlocking state, and then rotating the manual wrench 9 to place it in the vertical direction.

[0063] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by the combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An automatic latch, disposed at the top and / or bottom of a secondary door leaf, for engaging with a lock hole on the door frame to open or close the secondary door leaf, characterized in that, The automatic latch includes: The mounting component (1) has a first space, and its two ends along a first direction are respectively provided with a first opening and a second opening; The oblique tongue assembly (2) has a first through hole in the middle, and the extension direction of the first through hole is the first direction. The oblique tongue assembly (2) includes a main body (21) and an oblique tongue (22). A pin (3) passes through the first opening, the second opening and the first through hole, and the end of the pin (3) away from the first opening has a pin head (31). The automatic latch has an unlocked state and a locked state. When it is in the unlocked state, the main body (21) is placed in the first space, the latch (22) is exposed outside the mounting assembly (1), and the latch head (31) is placed inside the latch (22) exposed outside the mounting assembly (1), and the secondary door is in the open state. When it is in the locked state, both the main body (21) and the latch (22) are placed in the first space, and the latch head (31) extends out from the latch (22) and is inserted into the lock hole, and the secondary door is in the closed state. A drive component is provided for driving the automatic latch to switch between the unlocked state and the locked state.

2. The automatic latch according to claim 1, characterized in that, The outer wall of the middle part of the pin (3) placed in the first space is provided with an external thread (32). A limiting plate (4) is also provided in the first space. The limiting plate (4) is located on the side of the tongue assembly (2) near the first opening. The limiting plate (4) is sleeved on the outside of the pin (3). The side wall of the mounting assembly (1) is provided with a first limiting opening (12) communicating with the first space. The extension direction of the first limiting opening (12) is the first direction. The outer wall of the pin (3) is provided with a first limiting block (41) corresponding to the first limiting opening (12). The first limiting block (41) can be placed in the first limiting opening (12). The automatic pin slides within the open state; when the automatic pin is in the unlocked state, the limiting plate (4) is placed at the pin rod (3) with external thread (32), and the angle between the extension line of its extension direction and the extension line of the axis of the pin rod (3) is not equal to 90°, and the first limiting block (41) abuts against the side wall of the first limiting opening (12) near the second opening end; when the automatic pin is in the locked state, the limiting plate (4) is located near the first opening side, disengaged from the external thread (32) of the pin rod (3), and the extension line of the limiting plate (4) is perpendicular to the extension line of the axis of the pin rod (3).

3. The automatic latch according to claim 2, characterized in that, The first space is also provided with a first elastic component (5), which is sleeved on the outside of the pin rod (3) and placed on the side of the limiting plate (4) near the first opening. The end of the first elastic component (5) away from the first opening abuts against the limiting plate (4), and the other end abuts against the inner wall of the mounting component (1).

4. The automatic latch according to claim 2, characterized in that, The mounting assembly (1) has a second limiting opening (13) on the side wall opposite to the side wall with the first limiting opening (12). The extension line of the second limiting opening (13) is in the first direction, and its length is greater than that of the first limiting opening (12). The limiting plate (4) has a second limiting block (42) on the outer wall corresponding to the second limiting opening (13). The second limiting block (42) can move within the second limiting opening (13). The second limiting block (42) is used to prevent the limiting plate (4) from rotating on the pin rod (3).

5. The automatic latch according to claim 1, characterized in that, The sidewall of the main body (21) is cut to form a blocking part (211), which is used to prevent the tongue assembly (2) from dislodging from the first space when the automatic latch is in the unlocked state.

6. The automatic latch according to claim 1, characterized in that, The tongue portion (22) is provided with an extension portion (222), which is used to increase the contact area with the door frame.

7. The automatic latch according to claim 4, characterized in that, The side wall of the mounting component (1) is also provided with a third limiting opening (14), which intersects with the second limiting opening (13) to form a cross opening, which is used to place the limiting plate (4) into the first space.

8. The automatic latch according to claim 1, characterized in that, The drive assembly includes a central locking pin body disposed outside the mounting assembly (1) and near the first opening. The central locking pin body includes a mounting plate (6) fixed inside the sub-door frame. A first push rod (61) and a second push rod (62) are slidably connected on the mounting plate (6) in the first direction. The first push rod (61) is connected to the pin rod (3) away from the second opening, and the second push rod (62) is connected to the second elastic component (7) near the mounting assembly (1). The first push rod (61) and the pin rod (3) are connected to the second elastic component (7). The second push rod (62) is connected by a linkage structure. When the automatic latch is in the unlocked state, the first push rod (61) is placed away from the mounting component (1), the second push rod (62) is placed near the mounting component (1), and the second elastic component (7) is in the energy storage state. When the automatic latch is in the locked state, the first push rod (61) is placed near the mounting component (1), the second push rod (62) is placed away from the mounting component (1), and the second elastic component (7) is in the energy release state.

9. The automatic latch according to claim 8, characterized in that, The linkage structure includes a first linkage (81) rotatably connected to the mounting plate (6), the direction of the extension of the axis of its rotation is a second direction, the second direction is perpendicular to the first direction, the two ends of the first linkage (81) are respectively hinged to the end of the first push rod (61) away from the mounting assembly (1) and the end of the second push rod (62) near the mounting assembly (1), the direction of the extension of the axis of its hinge is the second direction.

10. The automatic latch according to claim 9, characterized in that, The second push rod (62) is hinged to the end away from the mounting assembly (1) with a second connecting rod (82). The end of the second connecting rod (82) away from the second push rod (62) is hinged to a manual wrench (9), and the direction of the extension line of the axis of its hinge shaft is the second direction.

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